Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2 | #include <linux/types.h> |
| 3 | #include <linux/skbuff.h> |
| 4 | #include <linux/socket.h> |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 5 | #include <linux/sysctl.h> |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 6 | #include <linux/net.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/if_arp.h> |
| 9 | #include <linux/ipv6.h> |
| 10 | #include <linux/mpls.h> |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 11 | #include <linux/netconf.h> |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 12 | #include <linux/nospec.h> |
Stephen Rothwell | 4b5edb2 | 2015-03-05 13:37:05 +1100 | [diff] [blame] | 13 | #include <linux/vmalloc.h> |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 14 | #include <linux/percpu.h> |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 15 | #include <net/ip.h> |
| 16 | #include <net/dst.h> |
| 17 | #include <net/sock.h> |
| 18 | #include <net/arp.h> |
| 19 | #include <net/ip_fib.h> |
| 20 | #include <net/netevent.h> |
Amine Kherbouche | bdc4764 | 2017-10-04 19:35:57 +0200 | [diff] [blame] | 21 | #include <net/ip_tunnels.h> |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 22 | #include <net/netns/generic.h> |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 23 | #if IS_ENABLED(CONFIG_IPV6) |
| 24 | #include <net/ipv6.h> |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 25 | #endif |
David Ahern | 3616d08 | 2019-03-22 06:06:09 -0700 | [diff] [blame] | 26 | #include <net/ipv6_stubs.h> |
David Ahern | 3c618c1 | 2019-04-20 09:28:20 -0700 | [diff] [blame] | 27 | #include <net/rtnh.h> |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 28 | #include "internal.h" |
| 29 | |
David Ahern | df1c631 | 2017-03-31 07:14:02 -0700 | [diff] [blame] | 30 | /* max memory we will use for mpls_route */ |
| 31 | #define MAX_MPLS_ROUTE_MEM 4096 |
| 32 | |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 33 | /* Maximum number of labels to look ahead at when selecting a path of |
| 34 | * a multipath route |
| 35 | */ |
| 36 | #define MAX_MP_SELECT_LABELS 4 |
| 37 | |
Robert Shearman | eb7809f | 2015-12-10 19:30:50 +0000 | [diff] [blame] | 38 | #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) |
| 39 | |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 40 | static int zero = 0; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 41 | static int one = 1; |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 42 | static int label_limit = (1 << 20) - 1; |
Robert Shearman | a59166e | 2017-03-10 20:43:25 +0000 | [diff] [blame] | 43 | static int ttl_max = 255; |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 44 | |
Amine Kherbouche | bdc4764 | 2017-10-04 19:35:57 +0200 | [diff] [blame] | 45 | #if IS_ENABLED(CONFIG_NET_IP_TUNNEL) |
Colin Ian King | 14c68c4 | 2017-10-11 10:53:28 +0100 | [diff] [blame] | 46 | static size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e) |
Amine Kherbouche | bdc4764 | 2017-10-04 19:35:57 +0200 | [diff] [blame] | 47 | { |
| 48 | return sizeof(struct mpls_shim_hdr); |
| 49 | } |
| 50 | |
| 51 | static const struct ip_tunnel_encap_ops mpls_iptun_ops = { |
| 52 | .encap_hlen = ipgre_mpls_encap_hlen, |
| 53 | }; |
| 54 | |
| 55 | static int ipgre_tunnel_encap_add_mpls_ops(void) |
| 56 | { |
| 57 | return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); |
| 58 | } |
| 59 | |
| 60 | static void ipgre_tunnel_encap_del_mpls_ops(void) |
| 61 | { |
| 62 | ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS); |
| 63 | } |
| 64 | #else |
| 65 | static int ipgre_tunnel_encap_add_mpls_ops(void) |
| 66 | { |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | static void ipgre_tunnel_encap_del_mpls_ops(void) |
| 71 | { |
| 72 | } |
| 73 | #endif |
| 74 | |
Eric W. Biederman | 8de147d | 2015-03-03 19:14:31 -0600 | [diff] [blame] | 75 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, |
| 76 | struct nlmsghdr *nlh, struct net *net, u32 portid, |
| 77 | unsigned int nlm_flags); |
| 78 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 79 | static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) |
| 80 | { |
| 81 | struct mpls_route *rt = NULL; |
| 82 | |
| 83 | if (index < net->mpls.platform_labels) { |
| 84 | struct mpls_route __rcu **platform_label = |
| 85 | rcu_dereference(net->mpls.platform_label); |
| 86 | rt = rcu_dereference(platform_label[index]); |
| 87 | } |
| 88 | return rt; |
| 89 | } |
| 90 | |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 91 | bool mpls_output_possible(const struct net_device *dev) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 92 | { |
| 93 | return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); |
| 94 | } |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 95 | EXPORT_SYMBOL_GPL(mpls_output_possible); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 96 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 97 | static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) |
| 98 | { |
David Ahern | 59b2096 | 2017-03-31 07:14:01 -0700 | [diff] [blame] | 99 | return (u8 *)nh + rt->rt_via_offset; |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | static const u8 *mpls_nh_via(const struct mpls_route *rt, |
| 103 | const struct mpls_nh *nh) |
| 104 | { |
| 105 | return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); |
| 106 | } |
| 107 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 108 | static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 109 | { |
| 110 | /* The size of the layer 2.5 labels to be added for this route */ |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 111 | return nh->nh_labels * sizeof(struct mpls_shim_hdr); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 112 | } |
| 113 | |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 114 | unsigned int mpls_dev_mtu(const struct net_device *dev) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 115 | { |
| 116 | /* The amount of data the layer 2 frame can hold */ |
| 117 | return dev->mtu; |
| 118 | } |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 119 | EXPORT_SYMBOL_GPL(mpls_dev_mtu); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 120 | |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 121 | bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 122 | { |
| 123 | if (skb->len <= mtu) |
| 124 | return false; |
| 125 | |
Daniel Axtens | 779b793 | 2018-03-01 17:13:37 +1100 | [diff] [blame] | 126 | if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 127 | return false; |
| 128 | |
| 129 | return true; |
| 130 | } |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 131 | EXPORT_SYMBOL_GPL(mpls_pkt_too_big); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 132 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 133 | void mpls_stats_inc_outucastpkts(struct net_device *dev, |
| 134 | const struct sk_buff *skb) |
| 135 | { |
| 136 | struct mpls_dev *mdev; |
| 137 | |
| 138 | if (skb->protocol == htons(ETH_P_MPLS_UC)) { |
| 139 | mdev = mpls_dev_get(dev); |
| 140 | if (mdev) |
| 141 | MPLS_INC_STATS_LEN(mdev, skb->len, |
| 142 | tx_packets, |
| 143 | tx_bytes); |
| 144 | } else if (skb->protocol == htons(ETH_P_IP)) { |
| 145 | IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len); |
| 146 | #if IS_ENABLED(CONFIG_IPV6) |
| 147 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 148 | struct inet6_dev *in6dev = __in6_dev_get(dev); |
| 149 | |
| 150 | if (in6dev) |
| 151 | IP6_UPD_PO_STATS(dev_net(dev), in6dev, |
| 152 | IPSTATS_MIB_OUT, skb->len); |
| 153 | #endif |
| 154 | } |
| 155 | } |
| 156 | EXPORT_SYMBOL_GPL(mpls_stats_inc_outucastpkts); |
| 157 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 158 | static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 159 | { |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 160 | struct mpls_entry_decoded dec; |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 161 | unsigned int mpls_hdr_len = 0; |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 162 | struct mpls_shim_hdr *hdr; |
| 163 | bool eli_seen = false; |
| 164 | int label_index; |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 165 | u32 hash = 0; |
| 166 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 167 | for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 168 | label_index++) { |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 169 | mpls_hdr_len += sizeof(*hdr); |
| 170 | if (!pskb_may_pull(skb, mpls_hdr_len)) |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 171 | break; |
| 172 | |
| 173 | /* Read and decode the current label */ |
| 174 | hdr = mpls_hdr(skb) + label_index; |
| 175 | dec = mpls_entry_decode(hdr); |
| 176 | |
| 177 | /* RFC6790 - reserved labels MUST NOT be used as keys |
| 178 | * for the load-balancing function |
| 179 | */ |
| 180 | if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { |
| 181 | hash = jhash_1word(dec.label, hash); |
| 182 | |
| 183 | /* The entropy label follows the entropy label |
| 184 | * indicator, so this means that the entropy |
| 185 | * label was just added to the hash - no need to |
| 186 | * go any deeper either in the label stack or in the |
| 187 | * payload |
| 188 | */ |
| 189 | if (eli_seen) |
| 190 | break; |
| 191 | } else if (dec.label == MPLS_LABEL_ENTROPY) { |
| 192 | eli_seen = true; |
| 193 | } |
| 194 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 195 | if (!dec.bos) |
| 196 | continue; |
| 197 | |
| 198 | /* found bottom label; does skb have room for a header? */ |
| 199 | if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 200 | const struct iphdr *v4hdr; |
| 201 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 202 | v4hdr = (const struct iphdr *)(hdr + 1); |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 203 | if (v4hdr->version == 4) { |
| 204 | hash = jhash_3words(ntohl(v4hdr->saddr), |
| 205 | ntohl(v4hdr->daddr), |
| 206 | v4hdr->protocol, hash); |
| 207 | } else if (v4hdr->version == 6 && |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 208 | pskb_may_pull(skb, mpls_hdr_len + |
| 209 | sizeof(struct ipv6hdr))) { |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 210 | const struct ipv6hdr *v6hdr; |
| 211 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 212 | v6hdr = (const struct ipv6hdr *)(hdr + 1); |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 213 | hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); |
| 214 | hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); |
| 215 | hash = jhash_1word(v6hdr->nexthdr, hash); |
| 216 | } |
| 217 | } |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 218 | |
| 219 | break; |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 222 | return hash; |
| 223 | } |
| 224 | |
David Ahern | 59b2096 | 2017-03-31 07:14:01 -0700 | [diff] [blame] | 225 | static struct mpls_nh *mpls_get_nexthop(struct mpls_route *rt, u8 index) |
| 226 | { |
| 227 | return (struct mpls_nh *)((u8 *)rt->rt_nh + index * rt->rt_nh_size); |
| 228 | } |
| 229 | |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 230 | /* number of alive nexthops (rt->rt_nhn_alive) and the flags for |
| 231 | * a next hop (nh->nh_flags) are modified by netdev event handlers. |
| 232 | * Since those fields can change at any moment, use READ_ONCE to |
| 233 | * access both. |
| 234 | */ |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 235 | static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 236 | struct sk_buff *skb) |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 237 | { |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 238 | u32 hash = 0; |
| 239 | int nh_index = 0; |
| 240 | int n = 0; |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 241 | u8 alive; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 242 | |
| 243 | /* No need to look further into packet if there's only |
| 244 | * one path |
| 245 | */ |
| 246 | if (rt->rt_nhn == 1) |
David Ahern | 59b2096 | 2017-03-31 07:14:01 -0700 | [diff] [blame] | 247 | return rt->rt_nh; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 248 | |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 249 | alive = READ_ONCE(rt->rt_nhn_alive); |
| 250 | if (alive == 0) |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 251 | return NULL; |
| 252 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 253 | hash = mpls_multipath_hash(rt, skb); |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 254 | nh_index = hash % alive; |
| 255 | if (alive == rt->rt_nhn) |
| 256 | goto out; |
| 257 | for_nexthops(rt) { |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 258 | unsigned int nh_flags = READ_ONCE(nh->nh_flags); |
| 259 | |
| 260 | if (nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 261 | continue; |
| 262 | if (n == nh_index) |
| 263 | return nh; |
| 264 | n++; |
| 265 | } endfor_nexthops(rt); |
| 266 | |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 267 | out: |
David Ahern | 59b2096 | 2017-03-31 07:14:01 -0700 | [diff] [blame] | 268 | return mpls_get_nexthop(rt, nh_index); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 269 | } |
| 270 | |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 271 | static bool mpls_egress(struct net *net, struct mpls_route *rt, |
| 272 | struct sk_buff *skb, struct mpls_entry_decoded dec) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 273 | { |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 274 | enum mpls_payload_type payload_type; |
| 275 | bool success = false; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 276 | |
Eric W. Biederman | 76fecd8 | 2015-03-12 18:22:59 -0500 | [diff] [blame] | 277 | /* The IPv4 code below accesses through the IPv4 header |
| 278 | * checksum, which is 12 bytes into the packet. |
| 279 | * The IPv6 code below accesses through the IPv6 hop limit |
| 280 | * which is 8 bytes into the packet. |
| 281 | * |
| 282 | * For all supported cases there should always be at least 12 |
| 283 | * bytes of packet data present. The IPv4 header is 20 bytes |
| 284 | * without options and the IPv6 header is always 40 bytes |
| 285 | * long. |
| 286 | */ |
| 287 | if (!pskb_may_pull(skb, 12)) |
| 288 | return false; |
| 289 | |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 290 | payload_type = rt->rt_payload_type; |
| 291 | if (payload_type == MPT_UNSPEC) |
| 292 | payload_type = ip_hdr(skb)->version; |
| 293 | |
| 294 | switch (payload_type) { |
| 295 | case MPT_IPV4: { |
| 296 | struct iphdr *hdr4 = ip_hdr(skb); |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 297 | u8 new_ttl; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 298 | skb->protocol = htons(ETH_P_IP); |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 299 | |
| 300 | /* If propagating TTL, take the decremented TTL from |
| 301 | * the incoming MPLS header, otherwise decrement the |
| 302 | * TTL, but only if not 0 to avoid underflow. |
| 303 | */ |
| 304 | if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || |
| 305 | (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && |
| 306 | net->mpls.ip_ttl_propagate)) |
| 307 | new_ttl = dec.ttl; |
| 308 | else |
| 309 | new_ttl = hdr4->ttl ? hdr4->ttl - 1 : 0; |
| 310 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 311 | csum_replace2(&hdr4->check, |
| 312 | htons(hdr4->ttl << 8), |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 313 | htons(new_ttl << 8)); |
| 314 | hdr4->ttl = new_ttl; |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 315 | success = true; |
| 316 | break; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 317 | } |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 318 | case MPT_IPV6: { |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 319 | struct ipv6hdr *hdr6 = ipv6_hdr(skb); |
| 320 | skb->protocol = htons(ETH_P_IPV6); |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 321 | |
| 322 | /* If propagating TTL, take the decremented TTL from |
| 323 | * the incoming MPLS header, otherwise decrement the |
| 324 | * hop limit, but only if not 0 to avoid underflow. |
| 325 | */ |
| 326 | if (rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED || |
| 327 | (rt->rt_ttl_propagate == MPLS_TTL_PROP_DEFAULT && |
| 328 | net->mpls.ip_ttl_propagate)) |
| 329 | hdr6->hop_limit = dec.ttl; |
| 330 | else if (hdr6->hop_limit) |
| 331 | hdr6->hop_limit = hdr6->hop_limit - 1; |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 332 | success = true; |
| 333 | break; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 334 | } |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 335 | case MPT_UNSPEC: |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 336 | /* Should have decided which protocol it is by now */ |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 337 | break; |
| 338 | } |
| 339 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 340 | return success; |
| 341 | } |
| 342 | |
| 343 | static int mpls_forward(struct sk_buff *skb, struct net_device *dev, |
| 344 | struct packet_type *pt, struct net_device *orig_dev) |
| 345 | { |
| 346 | struct net *net = dev_net(dev); |
| 347 | struct mpls_shim_hdr *hdr; |
| 348 | struct mpls_route *rt; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 349 | struct mpls_nh *nh; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 350 | struct mpls_entry_decoded dec; |
| 351 | struct net_device *out_dev; |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 352 | struct mpls_dev *out_mdev; |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 353 | struct mpls_dev *mdev; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 354 | unsigned int hh_len; |
| 355 | unsigned int new_header_size; |
| 356 | unsigned int mtu; |
| 357 | int err; |
| 358 | |
| 359 | /* Careful this entire function runs inside of an rcu critical section */ |
| 360 | |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 361 | mdev = mpls_dev_get(dev); |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 362 | if (!mdev) |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 363 | goto drop; |
| 364 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 365 | MPLS_INC_STATS_LEN(mdev, skb->len, rx_packets, |
| 366 | rx_bytes); |
| 367 | |
| 368 | if (!mdev->input_enabled) { |
| 369 | MPLS_INC_STATS(mdev, rx_dropped); |
| 370 | goto drop; |
| 371 | } |
| 372 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 373 | if (skb->pkt_type != PACKET_HOST) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 374 | goto err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 375 | |
| 376 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 377 | goto err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 378 | |
| 379 | if (!pskb_may_pull(skb, sizeof(*hdr))) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 380 | goto err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 381 | |
| 382 | /* Read and decode the label */ |
| 383 | hdr = mpls_hdr(skb); |
| 384 | dec = mpls_entry_decode(hdr); |
| 385 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 386 | rt = mpls_route_input_rcu(net, dec.label); |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 387 | if (!rt) { |
| 388 | MPLS_INC_STATS(mdev, rx_noroute); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 389 | goto drop; |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 390 | } |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 391 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 392 | nh = mpls_select_multipath(rt, skb); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 393 | if (!nh) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 394 | goto err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 395 | |
David Ahern | 9f427a0e | 2017-01-20 12:58:34 -0800 | [diff] [blame] | 396 | /* Pop the label */ |
| 397 | skb_pull(skb, sizeof(*hdr)); |
| 398 | skb_reset_network_header(skb); |
| 399 | |
| 400 | skb_orphan(skb); |
| 401 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 402 | if (skb_warn_if_lro(skb)) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 403 | goto err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 404 | |
| 405 | skb_forward_csum(skb); |
| 406 | |
| 407 | /* Verify ttl is valid */ |
Eric W. Biederman | aa7da93 | 2015-03-07 16:23:23 -0600 | [diff] [blame] | 408 | if (dec.ttl <= 1) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 409 | goto err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 410 | dec.ttl -= 1; |
| 411 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 412 | /* Find the output device */ |
| 413 | out_dev = rcu_dereference(nh->nh_dev); |
| 414 | if (!mpls_output_possible(out_dev)) |
| 415 | goto tx_err; |
| 416 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 417 | /* Verify the destination can hold the packet */ |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 418 | new_header_size = mpls_nh_header_size(nh); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 419 | mtu = mpls_dev_mtu(out_dev); |
| 420 | if (mpls_pkt_too_big(skb, mtu - new_header_size)) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 421 | goto tx_err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 422 | |
| 423 | hh_len = LL_RESERVED_SPACE(out_dev); |
| 424 | if (!out_dev->header_ops) |
| 425 | hh_len = 0; |
| 426 | |
| 427 | /* Ensure there is enough space for the headers in the skb */ |
| 428 | if (skb_cow(skb, hh_len + new_header_size)) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 429 | goto tx_err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 430 | |
| 431 | skb->dev = out_dev; |
| 432 | skb->protocol = htons(ETH_P_MPLS_UC); |
| 433 | |
| 434 | if (unlikely(!new_header_size && dec.bos)) { |
| 435 | /* Penultimate hop popping */ |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 436 | if (!mpls_egress(dev_net(out_dev), rt, skb, dec)) |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 437 | goto err; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 438 | } else { |
| 439 | bool bos; |
| 440 | int i; |
| 441 | skb_push(skb, new_header_size); |
| 442 | skb_reset_network_header(skb); |
| 443 | /* Push the new labels */ |
| 444 | hdr = mpls_hdr(skb); |
| 445 | bos = dec.bos; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 446 | for (i = nh->nh_labels - 1; i >= 0; i--) { |
| 447 | hdr[i] = mpls_entry_encode(nh->nh_label[i], |
| 448 | dec.ttl, 0, bos); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 449 | bos = false; |
| 450 | } |
| 451 | } |
| 452 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 453 | mpls_stats_inc_outucastpkts(out_dev, skb); |
| 454 | |
Robert Shearman | eb7809f | 2015-12-10 19:30:50 +0000 | [diff] [blame] | 455 | /* If via wasn't specified then send out using device address */ |
| 456 | if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) |
| 457 | err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, |
| 458 | out_dev->dev_addr, skb); |
| 459 | else |
| 460 | err = neigh_xmit(nh->nh_via_table, out_dev, |
| 461 | mpls_nh_via(rt, nh), skb); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 462 | if (err) |
| 463 | net_dbg_ratelimited("%s: packet transmission failed: %d\n", |
| 464 | __func__, err); |
| 465 | return 0; |
| 466 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 467 | tx_err: |
| 468 | out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; |
| 469 | if (out_mdev) |
| 470 | MPLS_INC_STATS(out_mdev, tx_errors); |
| 471 | goto drop; |
| 472 | err: |
| 473 | MPLS_INC_STATS(mdev, rx_errors); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 474 | drop: |
| 475 | kfree_skb(skb); |
| 476 | return NET_RX_DROP; |
| 477 | } |
| 478 | |
| 479 | static struct packet_type mpls_packet_type __read_mostly = { |
| 480 | .type = cpu_to_be16(ETH_P_MPLS_UC), |
| 481 | .func = mpls_forward, |
| 482 | }; |
| 483 | |
Wu Fengguang | f012653 | 2015-03-05 05:33:54 +0800 | [diff] [blame] | 484 | static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 485 | [RTA_DST] = { .type = NLA_U32 }, |
| 486 | [RTA_OIF] = { .type = NLA_U32 }, |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 487 | [RTA_TTL_PROPAGATE] = { .type = NLA_U8 }, |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 488 | }; |
| 489 | |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 490 | struct mpls_route_config { |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 491 | u32 rc_protocol; |
| 492 | u32 rc_ifindex; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 493 | u8 rc_via_table; |
| 494 | u8 rc_via_alen; |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 495 | u8 rc_via[MAX_VIA_ALEN]; |
| 496 | u32 rc_label; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 497 | u8 rc_ttl_propagate; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 498 | u8 rc_output_labels; |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 499 | u32 rc_output_label[MAX_NEW_LABELS]; |
| 500 | u32 rc_nlflags; |
| 501 | enum mpls_payload_type rc_payload_type; |
| 502 | struct nl_info rc_nlinfo; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 503 | struct rtnexthop *rc_mp; |
| 504 | int rc_mp_len; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 505 | }; |
| 506 | |
David Ahern | 59b2096 | 2017-03-31 07:14:01 -0700 | [diff] [blame] | 507 | /* all nexthops within a route have the same size based on max |
| 508 | * number of labels and max via length for a hop |
| 509 | */ |
| 510 | static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen, u8 max_labels) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 511 | { |
David Ahern | 59b2096 | 2017-03-31 07:14:01 -0700 | [diff] [blame] | 512 | u8 nh_size = MPLS_NH_SIZE(max_labels, max_alen); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 513 | struct mpls_route *rt; |
David Ahern | df1c631 | 2017-03-31 07:14:02 -0700 | [diff] [blame] | 514 | size_t size; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 515 | |
David Ahern | df1c631 | 2017-03-31 07:14:02 -0700 | [diff] [blame] | 516 | size = sizeof(*rt) + num_nh * nh_size; |
| 517 | if (size > MAX_MPLS_ROUTE_MEM) |
| 518 | return ERR_PTR(-EINVAL); |
| 519 | |
| 520 | rt = kzalloc(size, GFP_KERNEL); |
| 521 | if (!rt) |
| 522 | return ERR_PTR(-ENOMEM); |
| 523 | |
| 524 | rt->rt_nhn = num_nh; |
| 525 | rt->rt_nhn_alive = num_nh; |
| 526 | rt->rt_nh_size = nh_size; |
| 527 | rt->rt_via_offset = MPLS_NH_VIA_OFF(max_labels); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 528 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 529 | return rt; |
| 530 | } |
| 531 | |
| 532 | static void mpls_rt_free(struct mpls_route *rt) |
| 533 | { |
| 534 | if (rt) |
| 535 | kfree_rcu(rt, rt_rcu); |
| 536 | } |
| 537 | |
Eric W. Biederman | 8de147d | 2015-03-03 19:14:31 -0600 | [diff] [blame] | 538 | static void mpls_notify_route(struct net *net, unsigned index, |
| 539 | struct mpls_route *old, struct mpls_route *new, |
| 540 | const struct nl_info *info) |
| 541 | { |
| 542 | struct nlmsghdr *nlh = info ? info->nlh : NULL; |
| 543 | unsigned portid = info ? info->portid : 0; |
| 544 | int event = new ? RTM_NEWROUTE : RTM_DELROUTE; |
| 545 | struct mpls_route *rt = new ? new : old; |
| 546 | unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; |
| 547 | /* Ignore reserved labels for now */ |
Robert Shearman | a6affd2 | 2015-08-03 17:50:04 +0100 | [diff] [blame] | 548 | if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) |
Eric W. Biederman | 8de147d | 2015-03-03 19:14:31 -0600 | [diff] [blame] | 549 | rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); |
| 550 | } |
| 551 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 552 | static void mpls_route_update(struct net *net, unsigned index, |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 553 | struct mpls_route *new, |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 554 | const struct nl_info *info) |
| 555 | { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 556 | struct mpls_route __rcu **platform_label; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 557 | struct mpls_route *rt; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 558 | |
| 559 | ASSERT_RTNL(); |
| 560 | |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 561 | platform_label = rtnl_dereference(net->mpls.platform_label); |
| 562 | rt = rtnl_dereference(platform_label[index]); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 563 | rcu_assign_pointer(platform_label[index], new); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 564 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 565 | mpls_notify_route(net, index, rt, new, info); |
Eric W. Biederman | 8de147d | 2015-03-03 19:14:31 -0600 | [diff] [blame] | 566 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 567 | /* If we removed a route free it now */ |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 568 | mpls_rt_free(rt); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 569 | } |
| 570 | |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 571 | static unsigned find_free_label(struct net *net) |
| 572 | { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 573 | struct mpls_route __rcu **platform_label; |
| 574 | size_t platform_labels; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 575 | unsigned index; |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 576 | |
| 577 | platform_label = rtnl_dereference(net->mpls.platform_label); |
| 578 | platform_labels = net->mpls.platform_labels; |
Robert Shearman | a6affd2 | 2015-08-03 17:50:04 +0100 | [diff] [blame] | 579 | for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; |
| 580 | index++) { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 581 | if (!rtnl_dereference(platform_label[index])) |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 582 | return index; |
| 583 | } |
| 584 | return LABEL_NOT_SPECIFIED; |
| 585 | } |
| 586 | |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 587 | #if IS_ENABLED(CONFIG_INET) |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 588 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
| 589 | const void *addr) |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 590 | { |
Dan Carpenter | 5a9348b | 2015-08-04 10:44:22 +0300 | [diff] [blame] | 591 | struct net_device *dev; |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 592 | struct rtable *rt; |
| 593 | struct in_addr daddr; |
| 594 | |
| 595 | memcpy(&daddr, addr, sizeof(struct in_addr)); |
| 596 | rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); |
| 597 | if (IS_ERR(rt)) |
Dan Carpenter | 5a9348b | 2015-08-04 10:44:22 +0300 | [diff] [blame] | 598 | return ERR_CAST(rt); |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 599 | |
| 600 | dev = rt->dst.dev; |
| 601 | dev_hold(dev); |
| 602 | |
| 603 | ip_rt_put(rt); |
| 604 | |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 605 | return dev; |
| 606 | } |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 607 | #else |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 608 | static struct net_device *inet_fib_lookup_dev(struct net *net, |
| 609 | const void *addr) |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 610 | { |
| 611 | return ERR_PTR(-EAFNOSUPPORT); |
| 612 | } |
| 613 | #endif |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 614 | |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 615 | #if IS_ENABLED(CONFIG_IPV6) |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 616 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
| 617 | const void *addr) |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 618 | { |
Dan Carpenter | 5a9348b | 2015-08-04 10:44:22 +0300 | [diff] [blame] | 619 | struct net_device *dev; |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 620 | struct dst_entry *dst; |
| 621 | struct flowi6 fl6; |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 622 | int err; |
| 623 | |
| 624 | if (!ipv6_stub) |
| 625 | return ERR_PTR(-EAFNOSUPPORT); |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 626 | |
| 627 | memset(&fl6, 0, sizeof(fl6)); |
| 628 | memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 629 | err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); |
| 630 | if (err) |
Dan Carpenter | 5a9348b | 2015-08-04 10:44:22 +0300 | [diff] [blame] | 631 | return ERR_PTR(err); |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 632 | |
| 633 | dev = dst->dev; |
| 634 | dev_hold(dev); |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 635 | dst_release(dst); |
| 636 | |
| 637 | return dev; |
| 638 | } |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 639 | #else |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 640 | static struct net_device *inet6_fib_lookup_dev(struct net *net, |
| 641 | const void *addr) |
Roopa Prabhu | bf21563 | 2015-07-30 13:34:54 -0700 | [diff] [blame] | 642 | { |
| 643 | return ERR_PTR(-EAFNOSUPPORT); |
| 644 | } |
| 645 | #endif |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 646 | |
| 647 | static struct net_device *find_outdev(struct net *net, |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 648 | struct mpls_route *rt, |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 649 | struct mpls_nh *nh, int oif) |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 650 | { |
| 651 | struct net_device *dev = NULL; |
| 652 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 653 | if (!oif) { |
| 654 | switch (nh->nh_via_table) { |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 655 | case NEIGH_ARP_TABLE: |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 656 | dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 657 | break; |
| 658 | case NEIGH_ND_TABLE: |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 659 | dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 660 | break; |
| 661 | case NEIGH_LINK_TABLE: |
| 662 | break; |
| 663 | } |
| 664 | } else { |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 665 | dev = dev_get_by_index(net, oif); |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 666 | } |
| 667 | |
Roopa Prabhu | 3dcb615 | 2015-08-04 06:36:24 -0700 | [diff] [blame] | 668 | if (!dev) |
| 669 | return ERR_PTR(-ENODEV); |
| 670 | |
Roopa Prabhu | 94a57f1 | 2016-04-07 21:28:38 -0700 | [diff] [blame] | 671 | if (IS_ERR(dev)) |
| 672 | return dev; |
| 673 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 674 | /* The caller is holding rtnl anyways, so release the dev reference */ |
| 675 | dev_put(dev); |
| 676 | |
Roopa Prabhu | 01faef2 | 2015-07-21 09:16:24 -0700 | [diff] [blame] | 677 | return dev; |
| 678 | } |
| 679 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 680 | static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, |
| 681 | struct mpls_nh *nh, int oif) |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 682 | { |
| 683 | struct net_device *dev = NULL; |
| 684 | int err = -ENODEV; |
| 685 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 686 | dev = find_outdev(net, rt, nh, oif); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 687 | if (IS_ERR(dev)) { |
| 688 | err = PTR_ERR(dev); |
| 689 | dev = NULL; |
| 690 | goto errout; |
| 691 | } |
| 692 | |
| 693 | /* Ensure this is a supported device */ |
| 694 | err = -EINVAL; |
| 695 | if (!mpls_dev_get(dev)) |
| 696 | goto errout; |
| 697 | |
Robert Shearman | a3e948e | 2015-12-10 19:30:48 +0000 | [diff] [blame] | 698 | if ((nh->nh_via_table == NEIGH_LINK_TABLE) && |
| 699 | (dev->addr_len != nh->nh_via_alen)) |
| 700 | goto errout; |
| 701 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 702 | RCU_INIT_POINTER(nh->nh_dev, dev); |
| 703 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 704 | if (!(dev->flags & IFF_UP)) { |
| 705 | nh->nh_flags |= RTNH_F_DEAD; |
| 706 | } else { |
| 707 | unsigned int flags; |
| 708 | |
| 709 | flags = dev_get_flags(dev); |
| 710 | if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) |
| 711 | nh->nh_flags |= RTNH_F_LINKDOWN; |
| 712 | } |
| 713 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 714 | return 0; |
| 715 | |
| 716 | errout: |
| 717 | return err; |
| 718 | } |
| 719 | |
David Ahern | d4e7256 | 2017-05-27 16:19:32 -0600 | [diff] [blame] | 720 | static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, |
| 721 | u8 via_addr[], struct netlink_ext_ack *extack) |
| 722 | { |
| 723 | struct rtvia *via = nla_data(nla); |
| 724 | int err = -EINVAL; |
| 725 | int alen; |
| 726 | |
| 727 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { |
| 728 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 729 | "Invalid attribute length for RTA_VIA"); |
| 730 | goto errout; |
| 731 | } |
| 732 | alen = nla_len(nla) - |
| 733 | offsetof(struct rtvia, rtvia_addr); |
| 734 | if (alen > MAX_VIA_ALEN) { |
| 735 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 736 | "Invalid address length for RTA_VIA"); |
| 737 | goto errout; |
| 738 | } |
| 739 | |
| 740 | /* Validate the address family */ |
| 741 | switch (via->rtvia_family) { |
| 742 | case AF_PACKET: |
| 743 | *via_table = NEIGH_LINK_TABLE; |
| 744 | break; |
| 745 | case AF_INET: |
| 746 | *via_table = NEIGH_ARP_TABLE; |
| 747 | if (alen != 4) |
| 748 | goto errout; |
| 749 | break; |
| 750 | case AF_INET6: |
| 751 | *via_table = NEIGH_ND_TABLE; |
| 752 | if (alen != 16) |
| 753 | goto errout; |
| 754 | break; |
| 755 | default: |
| 756 | /* Unsupported address family */ |
| 757 | goto errout; |
| 758 | } |
| 759 | |
| 760 | memcpy(via_addr, via->rtvia_addr, alen); |
| 761 | *via_alen = alen; |
| 762 | err = 0; |
| 763 | |
| 764 | errout: |
| 765 | return err; |
| 766 | } |
| 767 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 768 | static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, |
| 769 | struct mpls_route *rt) |
| 770 | { |
| 771 | struct net *net = cfg->rc_nlinfo.nl_net; |
| 772 | struct mpls_nh *nh = rt->rt_nh; |
| 773 | int err; |
| 774 | int i; |
| 775 | |
| 776 | if (!nh) |
| 777 | return -ENOMEM; |
| 778 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 779 | nh->nh_labels = cfg->rc_output_labels; |
| 780 | for (i = 0; i < nh->nh_labels; i++) |
| 781 | nh->nh_label[i] = cfg->rc_output_label[i]; |
| 782 | |
| 783 | nh->nh_via_table = cfg->rc_via_table; |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 784 | memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 785 | nh->nh_via_alen = cfg->rc_via_alen; |
| 786 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 787 | err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 788 | if (err) |
| 789 | goto errout; |
| 790 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 791 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
| 792 | rt->rt_nhn_alive--; |
| 793 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 794 | return 0; |
| 795 | |
| 796 | errout: |
| 797 | return err; |
| 798 | } |
| 799 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 800 | static int mpls_nh_build(struct net *net, struct mpls_route *rt, |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 801 | struct mpls_nh *nh, int oif, struct nlattr *via, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 802 | struct nlattr *newdst, u8 max_labels, |
| 803 | struct netlink_ext_ack *extack) |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 804 | { |
| 805 | int err = -ENOMEM; |
| 806 | |
| 807 | if (!nh) |
| 808 | goto errout; |
| 809 | |
| 810 | if (newdst) { |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 811 | err = nla_get_labels(newdst, max_labels, &nh->nh_labels, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 812 | nh->nh_label, extack); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 813 | if (err) |
| 814 | goto errout; |
| 815 | } |
| 816 | |
Robert Shearman | f20367d | 2015-12-10 19:30:51 +0000 | [diff] [blame] | 817 | if (via) { |
| 818 | err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 819 | __mpls_nh_via(rt, nh), extack); |
Robert Shearman | f20367d | 2015-12-10 19:30:51 +0000 | [diff] [blame] | 820 | if (err) |
| 821 | goto errout; |
| 822 | } else { |
| 823 | nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; |
| 824 | } |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 825 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 826 | err = mpls_nh_assign_dev(net, rt, nh, oif); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 827 | if (err) |
| 828 | goto errout; |
| 829 | |
| 830 | return 0; |
| 831 | |
| 832 | errout: |
| 833 | return err; |
| 834 | } |
| 835 | |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 836 | static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 837 | u8 cfg_via_alen, u8 *max_via_alen, |
| 838 | u8 *max_labels) |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 839 | { |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 840 | int remaining = len; |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 841 | u8 nhs = 0; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 842 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 843 | *max_via_alen = 0; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 844 | *max_labels = 0; |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 845 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 846 | while (rtnh_ok(rtnh, remaining)) { |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 847 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); |
| 848 | int attrlen; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 849 | u8 n_labels = 0; |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 850 | |
| 851 | attrlen = rtnh_attrlen(rtnh); |
| 852 | nla = nla_find(attrs, attrlen, RTA_VIA); |
| 853 | if (nla && nla_len(nla) >= |
| 854 | offsetof(struct rtvia, rtvia_addr)) { |
| 855 | int via_alen = nla_len(nla) - |
| 856 | offsetof(struct rtvia, rtvia_addr); |
| 857 | |
| 858 | if (via_alen <= MAX_VIA_ALEN) |
| 859 | *max_via_alen = max_t(u16, *max_via_alen, |
| 860 | via_alen); |
| 861 | } |
| 862 | |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 863 | nla = nla_find(attrs, attrlen, RTA_NEWDST); |
| 864 | if (nla && |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 865 | nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, |
| 866 | NULL, NULL) != 0) |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 867 | return 0; |
| 868 | |
| 869 | *max_labels = max_t(u8, *max_labels, n_labels); |
| 870 | |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 871 | /* number of nexthops is tracked by a u8. |
| 872 | * Check for overflow. |
| 873 | */ |
| 874 | if (nhs == 255) |
| 875 | return 0; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 876 | nhs++; |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 877 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 878 | rtnh = rtnh_next(rtnh, &remaining); |
| 879 | } |
| 880 | |
| 881 | /* leftover implies invalid nexthop configuration, discard it */ |
| 882 | return remaining > 0 ? 0 : nhs; |
| 883 | } |
| 884 | |
| 885 | static int mpls_nh_build_multi(struct mpls_route_config *cfg, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 886 | struct mpls_route *rt, u8 max_labels, |
| 887 | struct netlink_ext_ack *extack) |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 888 | { |
| 889 | struct rtnexthop *rtnh = cfg->rc_mp; |
| 890 | struct nlattr *nla_via, *nla_newdst; |
| 891 | int remaining = cfg->rc_mp_len; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 892 | int err = 0; |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 893 | u8 nhs = 0; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 894 | |
| 895 | change_nexthops(rt) { |
| 896 | int attrlen; |
| 897 | |
| 898 | nla_via = NULL; |
| 899 | nla_newdst = NULL; |
| 900 | |
| 901 | err = -EINVAL; |
| 902 | if (!rtnh_ok(rtnh, remaining)) |
| 903 | goto errout; |
| 904 | |
Robert Shearman | 1c78efa | 2015-10-23 06:03:28 -0700 | [diff] [blame] | 905 | /* neither weighted multipath nor any flags |
| 906 | * are supported |
| 907 | */ |
| 908 | if (rtnh->rtnh_hops || rtnh->rtnh_flags) |
| 909 | goto errout; |
| 910 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 911 | attrlen = rtnh_attrlen(rtnh); |
| 912 | if (attrlen > 0) { |
| 913 | struct nlattr *attrs = rtnh_attrs(rtnh); |
| 914 | |
| 915 | nla_via = nla_find(attrs, attrlen, RTA_VIA); |
| 916 | nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); |
| 917 | } |
| 918 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 919 | err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 920 | rtnh->rtnh_ifindex, nla_via, nla_newdst, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 921 | max_labels, extack); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 922 | if (err) |
| 923 | goto errout; |
| 924 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 925 | if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) |
| 926 | rt->rt_nhn_alive--; |
| 927 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 928 | rtnh = rtnh_next(rtnh, &remaining); |
| 929 | nhs++; |
| 930 | } endfor_nexthops(rt); |
| 931 | |
| 932 | rt->rt_nhn = nhs; |
| 933 | |
| 934 | return 0; |
| 935 | |
| 936 | errout: |
| 937 | return err; |
| 938 | } |
| 939 | |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 940 | static bool mpls_label_ok(struct net *net, unsigned int *index, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 941 | struct netlink_ext_ack *extack) |
David Ahern | b7b386f | 2017-05-27 16:19:30 -0600 | [diff] [blame] | 942 | { |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 943 | bool is_ok = true; |
| 944 | |
David Ahern | b7b386f | 2017-05-27 16:19:30 -0600 | [diff] [blame] | 945 | /* Reserved labels may not be set */ |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 946 | if (*index < MPLS_LABEL_FIRST_UNRESERVED) { |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 947 | NL_SET_ERR_MSG(extack, |
| 948 | "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 949 | is_ok = false; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 950 | } |
David Ahern | b7b386f | 2017-05-27 16:19:30 -0600 | [diff] [blame] | 951 | |
| 952 | /* The full 20 bit range may not be supported. */ |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 953 | if (is_ok && *index >= net->mpls.platform_labels) { |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 954 | NL_SET_ERR_MSG(extack, |
| 955 | "Label >= configured maximum in platform_labels"); |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 956 | is_ok = false; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 957 | } |
David Ahern | b7b386f | 2017-05-27 16:19:30 -0600 | [diff] [blame] | 958 | |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 959 | *index = array_index_nospec(*index, net->mpls.platform_labels); |
| 960 | return is_ok; |
David Ahern | b7b386f | 2017-05-27 16:19:30 -0600 | [diff] [blame] | 961 | } |
| 962 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 963 | static int mpls_route_add(struct mpls_route_config *cfg, |
| 964 | struct netlink_ext_ack *extack) |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 965 | { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 966 | struct mpls_route __rcu **platform_label; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 967 | struct net *net = cfg->rc_nlinfo.nl_net; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 968 | struct mpls_route *rt, *old; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 969 | int err = -EINVAL; |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 970 | u8 max_via_alen; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 971 | unsigned index; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 972 | u8 max_labels; |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 973 | u8 nhs; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 974 | |
| 975 | index = cfg->rc_label; |
| 976 | |
| 977 | /* If a label was not specified during insert pick one */ |
| 978 | if ((index == LABEL_NOT_SPECIFIED) && |
| 979 | (cfg->rc_nlflags & NLM_F_CREATE)) { |
| 980 | index = find_free_label(net); |
| 981 | } |
| 982 | |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 983 | if (!mpls_label_ok(net, &index, extack)) |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 984 | goto errout; |
| 985 | |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 986 | /* Append makes no sense with mpls */ |
Eric W. Biederman | 0f7bbd5 | 2015-03-07 16:22:40 -0600 | [diff] [blame] | 987 | err = -EOPNOTSUPP; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 988 | if (cfg->rc_nlflags & NLM_F_APPEND) { |
| 989 | NL_SET_ERR_MSG(extack, "MPLS does not support route append"); |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 990 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 991 | } |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 992 | |
| 993 | err = -EEXIST; |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 994 | platform_label = rtnl_dereference(net->mpls.platform_label); |
| 995 | old = rtnl_dereference(platform_label[index]); |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 996 | if ((cfg->rc_nlflags & NLM_F_EXCL) && old) |
| 997 | goto errout; |
| 998 | |
| 999 | err = -EEXIST; |
| 1000 | if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) |
| 1001 | goto errout; |
| 1002 | |
| 1003 | err = -ENOENT; |
| 1004 | if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) |
| 1005 | goto errout; |
| 1006 | |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 1007 | err = -EINVAL; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1008 | if (cfg->rc_mp) { |
| 1009 | nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, |
| 1010 | cfg->rc_via_alen, &max_via_alen, |
| 1011 | &max_labels); |
| 1012 | } else { |
| 1013 | max_via_alen = cfg->rc_via_alen; |
| 1014 | max_labels = cfg->rc_output_labels; |
| 1015 | nhs = 1; |
| 1016 | } |
| 1017 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1018 | if (nhs == 0) { |
| 1019 | NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 1020 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1021 | } |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1022 | |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1023 | err = -ENOMEM; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1024 | rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); |
David Ahern | df1c631 | 2017-03-31 07:14:02 -0700 | [diff] [blame] | 1025 | if (IS_ERR(rt)) { |
| 1026 | err = PTR_ERR(rt); |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1027 | goto errout; |
David Ahern | df1c631 | 2017-03-31 07:14:02 -0700 | [diff] [blame] | 1028 | } |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1029 | |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1030 | rt->rt_protocol = cfg->rc_protocol; |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 1031 | rt->rt_payload_type = cfg->rc_payload_type; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 1032 | rt->rt_ttl_propagate = cfg->rc_ttl_propagate; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1033 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1034 | if (cfg->rc_mp) |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1035 | err = mpls_nh_build_multi(cfg, rt, max_labels, extack); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1036 | else |
| 1037 | err = mpls_nh_build_from_cfg(cfg, rt); |
| 1038 | if (err) |
| 1039 | goto freert; |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1040 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1041 | mpls_route_update(net, index, rt, &cfg->rc_nlinfo); |
| 1042 | |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1043 | return 0; |
| 1044 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1045 | freert: |
| 1046 | mpls_rt_free(rt); |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1047 | errout: |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1048 | return err; |
| 1049 | } |
| 1050 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1051 | static int mpls_route_del(struct mpls_route_config *cfg, |
| 1052 | struct netlink_ext_ack *extack) |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1053 | { |
| 1054 | struct net *net = cfg->rc_nlinfo.nl_net; |
| 1055 | unsigned index; |
| 1056 | int err = -EINVAL; |
| 1057 | |
| 1058 | index = cfg->rc_label; |
| 1059 | |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 1060 | if (!mpls_label_ok(net, &index, extack)) |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1061 | goto errout; |
| 1062 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1063 | mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); |
Eric W. Biederman | a251992 | 2015-03-03 19:12:40 -0600 | [diff] [blame] | 1064 | |
| 1065 | err = 0; |
| 1066 | errout: |
| 1067 | return err; |
| 1068 | } |
| 1069 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 1070 | static void mpls_get_stats(struct mpls_dev *mdev, |
| 1071 | struct mpls_link_stats *stats) |
| 1072 | { |
| 1073 | struct mpls_pcpu_stats *p; |
| 1074 | int i; |
| 1075 | |
| 1076 | memset(stats, 0, sizeof(*stats)); |
| 1077 | |
| 1078 | for_each_possible_cpu(i) { |
| 1079 | struct mpls_link_stats local; |
| 1080 | unsigned int start; |
| 1081 | |
| 1082 | p = per_cpu_ptr(mdev->stats, i); |
| 1083 | do { |
| 1084 | start = u64_stats_fetch_begin(&p->syncp); |
| 1085 | local = p->stats; |
| 1086 | } while (u64_stats_fetch_retry(&p->syncp, start)); |
| 1087 | |
| 1088 | stats->rx_packets += local.rx_packets; |
| 1089 | stats->rx_bytes += local.rx_bytes; |
| 1090 | stats->tx_packets += local.tx_packets; |
| 1091 | stats->tx_bytes += local.tx_bytes; |
| 1092 | stats->rx_errors += local.rx_errors; |
| 1093 | stats->tx_errors += local.tx_errors; |
| 1094 | stats->rx_dropped += local.rx_dropped; |
| 1095 | stats->tx_dropped += local.tx_dropped; |
| 1096 | stats->rx_noroute += local.rx_noroute; |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | static int mpls_fill_stats_af(struct sk_buff *skb, |
| 1101 | const struct net_device *dev) |
| 1102 | { |
| 1103 | struct mpls_link_stats *stats; |
| 1104 | struct mpls_dev *mdev; |
| 1105 | struct nlattr *nla; |
| 1106 | |
| 1107 | mdev = mpls_dev_get(dev); |
| 1108 | if (!mdev) |
| 1109 | return -ENODATA; |
| 1110 | |
| 1111 | nla = nla_reserve_64bit(skb, MPLS_STATS_LINK, |
| 1112 | sizeof(struct mpls_link_stats), |
| 1113 | MPLS_STATS_UNSPEC); |
| 1114 | if (!nla) |
| 1115 | return -EMSGSIZE; |
| 1116 | |
| 1117 | stats = nla_data(nla); |
| 1118 | mpls_get_stats(mdev, stats); |
| 1119 | |
| 1120 | return 0; |
| 1121 | } |
| 1122 | |
| 1123 | static size_t mpls_get_stats_af_size(const struct net_device *dev) |
| 1124 | { |
| 1125 | struct mpls_dev *mdev; |
| 1126 | |
| 1127 | mdev = mpls_dev_get(dev); |
| 1128 | if (!mdev) |
| 1129 | return 0; |
| 1130 | |
| 1131 | return nla_total_size_64bit(sizeof(struct mpls_link_stats)); |
| 1132 | } |
| 1133 | |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1134 | static int mpls_netconf_fill_devconf(struct sk_buff *skb, struct mpls_dev *mdev, |
| 1135 | u32 portid, u32 seq, int event, |
| 1136 | unsigned int flags, int type) |
| 1137 | { |
| 1138 | struct nlmsghdr *nlh; |
| 1139 | struct netconfmsg *ncm; |
| 1140 | bool all = false; |
| 1141 | |
| 1142 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), |
| 1143 | flags); |
| 1144 | if (!nlh) |
| 1145 | return -EMSGSIZE; |
| 1146 | |
| 1147 | if (type == NETCONFA_ALL) |
| 1148 | all = true; |
| 1149 | |
| 1150 | ncm = nlmsg_data(nlh); |
| 1151 | ncm->ncm_family = AF_MPLS; |
| 1152 | |
| 1153 | if (nla_put_s32(skb, NETCONFA_IFINDEX, mdev->dev->ifindex) < 0) |
| 1154 | goto nla_put_failure; |
| 1155 | |
| 1156 | if ((all || type == NETCONFA_INPUT) && |
| 1157 | nla_put_s32(skb, NETCONFA_INPUT, |
| 1158 | mdev->input_enabled) < 0) |
| 1159 | goto nla_put_failure; |
| 1160 | |
| 1161 | nlmsg_end(skb, nlh); |
| 1162 | return 0; |
| 1163 | |
| 1164 | nla_put_failure: |
| 1165 | nlmsg_cancel(skb, nlh); |
| 1166 | return -EMSGSIZE; |
| 1167 | } |
| 1168 | |
| 1169 | static int mpls_netconf_msgsize_devconf(int type) |
| 1170 | { |
| 1171 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) |
| 1172 | + nla_total_size(4); /* NETCONFA_IFINDEX */ |
| 1173 | bool all = false; |
| 1174 | |
| 1175 | if (type == NETCONFA_ALL) |
| 1176 | all = true; |
| 1177 | |
| 1178 | if (all || type == NETCONFA_INPUT) |
| 1179 | size += nla_total_size(4); |
| 1180 | |
| 1181 | return size; |
| 1182 | } |
| 1183 | |
David Ahern | 823566a | 2017-03-28 14:28:06 -0700 | [diff] [blame] | 1184 | static void mpls_netconf_notify_devconf(struct net *net, int event, |
| 1185 | int type, struct mpls_dev *mdev) |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1186 | { |
| 1187 | struct sk_buff *skb; |
| 1188 | int err = -ENOBUFS; |
| 1189 | |
| 1190 | skb = nlmsg_new(mpls_netconf_msgsize_devconf(type), GFP_KERNEL); |
| 1191 | if (!skb) |
| 1192 | goto errout; |
| 1193 | |
David Ahern | 823566a | 2017-03-28 14:28:06 -0700 | [diff] [blame] | 1194 | err = mpls_netconf_fill_devconf(skb, mdev, 0, 0, event, 0, type); |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1195 | if (err < 0) { |
| 1196 | /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ |
| 1197 | WARN_ON(err == -EMSGSIZE); |
| 1198 | kfree_skb(skb); |
| 1199 | goto errout; |
| 1200 | } |
| 1201 | |
| 1202 | rtnl_notify(skb, net, 0, RTNLGRP_MPLS_NETCONF, NULL, GFP_KERNEL); |
| 1203 | return; |
| 1204 | errout: |
| 1205 | if (err < 0) |
| 1206 | rtnl_set_sk_err(net, RTNLGRP_MPLS_NETCONF, err); |
| 1207 | } |
| 1208 | |
| 1209 | static const struct nla_policy devconf_mpls_policy[NETCONFA_MAX + 1] = { |
| 1210 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, |
| 1211 | }; |
| 1212 | |
Jakub Kicinski | 0c4056e | 2019-01-18 10:46:26 -0800 | [diff] [blame] | 1213 | static int mpls_netconf_valid_get_req(struct sk_buff *skb, |
| 1214 | const struct nlmsghdr *nlh, |
| 1215 | struct nlattr **tb, |
| 1216 | struct netlink_ext_ack *extack) |
| 1217 | { |
| 1218 | int i, err; |
| 1219 | |
| 1220 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { |
| 1221 | NL_SET_ERR_MSG_MOD(extack, |
| 1222 | "Invalid header for netconf get request"); |
| 1223 | return -EINVAL; |
| 1224 | } |
| 1225 | |
| 1226 | if (!netlink_strict_get_check(skb)) |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 1227 | return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), |
| 1228 | tb, NETCONFA_MAX, |
| 1229 | devconf_mpls_policy, extack); |
Jakub Kicinski | 0c4056e | 2019-01-18 10:46:26 -0800 | [diff] [blame] | 1230 | |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 1231 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), |
| 1232 | tb, NETCONFA_MAX, |
| 1233 | devconf_mpls_policy, extack); |
Jakub Kicinski | 0c4056e | 2019-01-18 10:46:26 -0800 | [diff] [blame] | 1234 | if (err) |
| 1235 | return err; |
| 1236 | |
| 1237 | for (i = 0; i <= NETCONFA_MAX; i++) { |
| 1238 | if (!tb[i]) |
| 1239 | continue; |
| 1240 | |
| 1241 | switch (i) { |
| 1242 | case NETCONFA_IFINDEX: |
| 1243 | break; |
| 1244 | default: |
| 1245 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); |
| 1246 | return -EINVAL; |
| 1247 | } |
| 1248 | } |
| 1249 | |
| 1250 | return 0; |
| 1251 | } |
| 1252 | |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1253 | static int mpls_netconf_get_devconf(struct sk_buff *in_skb, |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 1254 | struct nlmsghdr *nlh, |
| 1255 | struct netlink_ext_ack *extack) |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1256 | { |
| 1257 | struct net *net = sock_net(in_skb->sk); |
| 1258 | struct nlattr *tb[NETCONFA_MAX + 1]; |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1259 | struct net_device *dev; |
| 1260 | struct mpls_dev *mdev; |
| 1261 | struct sk_buff *skb; |
| 1262 | int ifindex; |
| 1263 | int err; |
| 1264 | |
Jakub Kicinski | 0c4056e | 2019-01-18 10:46:26 -0800 | [diff] [blame] | 1265 | err = mpls_netconf_valid_get_req(in_skb, nlh, tb, extack); |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1266 | if (err < 0) |
| 1267 | goto errout; |
| 1268 | |
| 1269 | err = -EINVAL; |
| 1270 | if (!tb[NETCONFA_IFINDEX]) |
| 1271 | goto errout; |
| 1272 | |
| 1273 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); |
| 1274 | dev = __dev_get_by_index(net, ifindex); |
| 1275 | if (!dev) |
| 1276 | goto errout; |
| 1277 | |
| 1278 | mdev = mpls_dev_get(dev); |
| 1279 | if (!mdev) |
| 1280 | goto errout; |
| 1281 | |
| 1282 | err = -ENOBUFS; |
| 1283 | skb = nlmsg_new(mpls_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); |
| 1284 | if (!skb) |
| 1285 | goto errout; |
| 1286 | |
| 1287 | err = mpls_netconf_fill_devconf(skb, mdev, |
| 1288 | NETLINK_CB(in_skb).portid, |
| 1289 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, |
| 1290 | NETCONFA_ALL); |
| 1291 | if (err < 0) { |
| 1292 | /* -EMSGSIZE implies BUG in mpls_netconf_msgsize_devconf() */ |
| 1293 | WARN_ON(err == -EMSGSIZE); |
| 1294 | kfree_skb(skb); |
| 1295 | goto errout; |
| 1296 | } |
| 1297 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
| 1298 | errout: |
| 1299 | return err; |
| 1300 | } |
| 1301 | |
| 1302 | static int mpls_netconf_dump_devconf(struct sk_buff *skb, |
| 1303 | struct netlink_callback *cb) |
| 1304 | { |
David Ahern | addd383 | 2018-10-07 20:16:41 -0700 | [diff] [blame] | 1305 | const struct nlmsghdr *nlh = cb->nlh; |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1306 | struct net *net = sock_net(skb->sk); |
| 1307 | struct hlist_head *head; |
| 1308 | struct net_device *dev; |
| 1309 | struct mpls_dev *mdev; |
| 1310 | int idx, s_idx; |
| 1311 | int h, s_h; |
| 1312 | |
David Ahern | addd383 | 2018-10-07 20:16:41 -0700 | [diff] [blame] | 1313 | if (cb->strict_check) { |
| 1314 | struct netlink_ext_ack *extack = cb->extack; |
| 1315 | struct netconfmsg *ncm; |
| 1316 | |
| 1317 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { |
| 1318 | NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); |
| 1319 | return -EINVAL; |
| 1320 | } |
| 1321 | |
| 1322 | if (nlmsg_attrlen(nlh, sizeof(*ncm))) { |
| 1323 | NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); |
| 1324 | return -EINVAL; |
| 1325 | } |
| 1326 | } |
| 1327 | |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1328 | s_h = cb->args[0]; |
| 1329 | s_idx = idx = cb->args[1]; |
| 1330 | |
| 1331 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { |
| 1332 | idx = 0; |
| 1333 | head = &net->dev_index_head[h]; |
| 1334 | rcu_read_lock(); |
| 1335 | cb->seq = net->dev_base_seq; |
| 1336 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
| 1337 | if (idx < s_idx) |
| 1338 | goto cont; |
| 1339 | mdev = mpls_dev_get(dev); |
| 1340 | if (!mdev) |
| 1341 | goto cont; |
| 1342 | if (mpls_netconf_fill_devconf(skb, mdev, |
| 1343 | NETLINK_CB(cb->skb).portid, |
David Ahern | addd383 | 2018-10-07 20:16:41 -0700 | [diff] [blame] | 1344 | nlh->nlmsg_seq, |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1345 | RTM_NEWNETCONF, |
| 1346 | NLM_F_MULTI, |
| 1347 | NETCONFA_ALL) < 0) { |
| 1348 | rcu_read_unlock(); |
| 1349 | goto done; |
| 1350 | } |
| 1351 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
| 1352 | cont: |
| 1353 | idx++; |
| 1354 | } |
| 1355 | rcu_read_unlock(); |
| 1356 | } |
| 1357 | done: |
| 1358 | cb->args[0] = h; |
| 1359 | cb->args[1] = idx; |
| 1360 | |
| 1361 | return skb->len; |
| 1362 | } |
| 1363 | |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1364 | #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ |
| 1365 | (&((struct mpls_dev *)0)->field) |
| 1366 | |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1367 | static int mpls_conf_proc(struct ctl_table *ctl, int write, |
| 1368 | void __user *buffer, |
| 1369 | size_t *lenp, loff_t *ppos) |
| 1370 | { |
| 1371 | int oval = *(int *)ctl->data; |
| 1372 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
| 1373 | |
| 1374 | if (write) { |
| 1375 | struct mpls_dev *mdev = ctl->extra1; |
| 1376 | int i = (int *)ctl->data - (int *)mdev; |
| 1377 | struct net *net = ctl->extra2; |
| 1378 | int val = *(int *)ctl->data; |
| 1379 | |
| 1380 | if (i == offsetof(struct mpls_dev, input_enabled) && |
| 1381 | val != oval) { |
David Ahern | 823566a | 2017-03-28 14:28:06 -0700 | [diff] [blame] | 1382 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, |
| 1383 | NETCONFA_INPUT, mdev); |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1384 | } |
| 1385 | } |
| 1386 | |
| 1387 | return ret; |
| 1388 | } |
| 1389 | |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1390 | static const struct ctl_table mpls_dev_table[] = { |
| 1391 | { |
| 1392 | .procname = "input", |
| 1393 | .maxlen = sizeof(int), |
| 1394 | .mode = 0644, |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1395 | .proc_handler = mpls_conf_proc, |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1396 | .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), |
| 1397 | }, |
| 1398 | { } |
| 1399 | }; |
| 1400 | |
| 1401 | static int mpls_dev_sysctl_register(struct net_device *dev, |
| 1402 | struct mpls_dev *mdev) |
| 1403 | { |
| 1404 | char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1405 | struct net *net = dev_net(dev); |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1406 | struct ctl_table *table; |
| 1407 | int i; |
| 1408 | |
| 1409 | table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); |
| 1410 | if (!table) |
| 1411 | goto out; |
| 1412 | |
| 1413 | /* Table data contains only offsets relative to the base of |
| 1414 | * the mdev at this point, so make them absolute. |
| 1415 | */ |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1416 | for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) { |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1417 | table[i].data = (char *)mdev + (uintptr_t)table[i].data; |
David Ahern | 24045a0 | 2017-02-20 08:03:30 -0800 | [diff] [blame] | 1418 | table[i].extra1 = mdev; |
| 1419 | table[i].extra2 = net; |
| 1420 | } |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1421 | |
| 1422 | snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); |
| 1423 | |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1424 | mdev->sysctl = register_net_sysctl(net, path, table); |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1425 | if (!mdev->sysctl) |
| 1426 | goto free; |
| 1427 | |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1428 | mpls_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, mdev); |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1429 | return 0; |
| 1430 | |
| 1431 | free: |
| 1432 | kfree(table); |
| 1433 | out: |
| 1434 | return -ENOBUFS; |
| 1435 | } |
| 1436 | |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1437 | static void mpls_dev_sysctl_unregister(struct net_device *dev, |
| 1438 | struct mpls_dev *mdev) |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1439 | { |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1440 | struct net *net = dev_net(dev); |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1441 | struct ctl_table *table; |
| 1442 | |
| 1443 | table = mdev->sysctl->ctl_table_arg; |
| 1444 | unregister_net_sysctl_table(mdev->sysctl); |
| 1445 | kfree(table); |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1446 | |
| 1447 | mpls_netconf_notify_devconf(net, RTM_DELNETCONF, 0, mdev); |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1448 | } |
| 1449 | |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1450 | static struct mpls_dev *mpls_add_dev(struct net_device *dev) |
| 1451 | { |
| 1452 | struct mpls_dev *mdev; |
| 1453 | int err = -ENOMEM; |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 1454 | int i; |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1455 | |
| 1456 | ASSERT_RTNL(); |
| 1457 | |
| 1458 | mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); |
| 1459 | if (!mdev) |
| 1460 | return ERR_PTR(err); |
| 1461 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 1462 | mdev->stats = alloc_percpu(struct mpls_pcpu_stats); |
| 1463 | if (!mdev->stats) |
| 1464 | goto free; |
| 1465 | |
| 1466 | for_each_possible_cpu(i) { |
| 1467 | struct mpls_pcpu_stats *mpls_stats; |
| 1468 | |
| 1469 | mpls_stats = per_cpu_ptr(mdev->stats, i); |
| 1470 | u64_stats_init(&mpls_stats->syncp); |
| 1471 | } |
| 1472 | |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1473 | mdev->dev = dev; |
| 1474 | |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1475 | err = mpls_dev_sysctl_register(dev, mdev); |
| 1476 | if (err) |
| 1477 | goto free; |
| 1478 | |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1479 | rcu_assign_pointer(dev->mpls_ptr, mdev); |
| 1480 | |
| 1481 | return mdev; |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1482 | |
| 1483 | free: |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 1484 | free_percpu(mdev->stats); |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1485 | kfree(mdev); |
| 1486 | return ERR_PTR(err); |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1487 | } |
| 1488 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 1489 | static void mpls_dev_destroy_rcu(struct rcu_head *head) |
| 1490 | { |
| 1491 | struct mpls_dev *mdev = container_of(head, struct mpls_dev, rcu); |
| 1492 | |
| 1493 | free_percpu(mdev->stats); |
| 1494 | kfree(mdev); |
| 1495 | } |
| 1496 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1497 | static void mpls_ifdown(struct net_device *dev, int event) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1498 | { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 1499 | struct mpls_route __rcu **platform_label; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1500 | struct net *net = dev_net(dev); |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 1501 | u8 alive, deleted; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1502 | unsigned index; |
| 1503 | |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 1504 | platform_label = rtnl_dereference(net->mpls.platform_label); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1505 | for (index = 0; index < net->mpls.platform_labels; index++) { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 1506 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1507 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1508 | if (!rt) |
| 1509 | continue; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1510 | |
David Ahern | 61733c9 | 2017-03-13 16:49:10 -0700 | [diff] [blame] | 1511 | alive = 0; |
David Ahern | 4ea8efa | 2017-03-24 15:21:57 -0700 | [diff] [blame] | 1512 | deleted = 0; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1513 | change_nexthops(rt) { |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1514 | unsigned int nh_flags = nh->nh_flags; |
| 1515 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1516 | if (rtnl_dereference(nh->nh_dev) != dev) |
David Ahern | 61733c9 | 2017-03-13 16:49:10 -0700 | [diff] [blame] | 1517 | goto next; |
| 1518 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1519 | switch (event) { |
| 1520 | case NETDEV_DOWN: |
| 1521 | case NETDEV_UNREGISTER: |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1522 | nh_flags |= RTNH_F_DEAD; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1523 | /* fall through */ |
| 1524 | case NETDEV_CHANGE: |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1525 | nh_flags |= RTNH_F_LINKDOWN; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1526 | break; |
| 1527 | } |
| 1528 | if (event == NETDEV_UNREGISTER) |
| 1529 | RCU_INIT_POINTER(nh->nh_dev, NULL); |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1530 | |
| 1531 | if (nh->nh_flags != nh_flags) |
| 1532 | WRITE_ONCE(nh->nh_flags, nh_flags); |
David Ahern | 61733c9 | 2017-03-13 16:49:10 -0700 | [diff] [blame] | 1533 | next: |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1534 | if (!(nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN))) |
David Ahern | 61733c9 | 2017-03-13 16:49:10 -0700 | [diff] [blame] | 1535 | alive++; |
David Ahern | 4ea8efa | 2017-03-24 15:21:57 -0700 | [diff] [blame] | 1536 | if (!rtnl_dereference(nh->nh_dev)) |
| 1537 | deleted++; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1538 | } endfor_nexthops(rt); |
David Ahern | 61733c9 | 2017-03-13 16:49:10 -0700 | [diff] [blame] | 1539 | |
| 1540 | WRITE_ONCE(rt->rt_nhn_alive, alive); |
David Ahern | 4ea8efa | 2017-03-24 15:21:57 -0700 | [diff] [blame] | 1541 | |
| 1542 | /* if there are no more nexthops, delete the route */ |
| 1543 | if (event == NETDEV_UNREGISTER && deleted == rt->rt_nhn) |
| 1544 | mpls_route_update(net, index, NULL, NULL); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1545 | } |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1546 | } |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 1547 | |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1548 | static void mpls_ifup(struct net_device *dev, unsigned int flags) |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1549 | { |
| 1550 | struct mpls_route __rcu **platform_label; |
| 1551 | struct net *net = dev_net(dev); |
| 1552 | unsigned index; |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 1553 | u8 alive; |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1554 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1555 | platform_label = rtnl_dereference(net->mpls.platform_label); |
| 1556 | for (index = 0; index < net->mpls.platform_labels; index++) { |
| 1557 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
| 1558 | |
| 1559 | if (!rt) |
| 1560 | continue; |
| 1561 | |
| 1562 | alive = 0; |
| 1563 | change_nexthops(rt) { |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1564 | unsigned int nh_flags = nh->nh_flags; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1565 | struct net_device *nh_dev = |
| 1566 | rtnl_dereference(nh->nh_dev); |
| 1567 | |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1568 | if (!(nh_flags & flags)) { |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1569 | alive++; |
| 1570 | continue; |
| 1571 | } |
| 1572 | if (nh_dev != dev) |
| 1573 | continue; |
| 1574 | alive++; |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1575 | nh_flags &= ~flags; |
Roopa Prabhu | c2e8471 | 2017-05-30 23:50:36 -0700 | [diff] [blame] | 1576 | WRITE_ONCE(nh->nh_flags, nh_flags); |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1577 | } endfor_nexthops(rt); |
| 1578 | |
David Ahern | 39eb8cd | 2017-03-31 07:13:59 -0700 | [diff] [blame] | 1579 | WRITE_ONCE(rt->rt_nhn_alive, alive); |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1580 | } |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1581 | } |
| 1582 | |
| 1583 | static int mpls_dev_notify(struct notifier_block *this, unsigned long event, |
| 1584 | void *ptr) |
| 1585 | { |
| 1586 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1587 | struct mpls_dev *mdev; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1588 | unsigned int flags; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1589 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1590 | if (event == NETDEV_REGISTER) { |
Saif Hasan | d8e2262 | 2018-09-21 14:30:05 -0700 | [diff] [blame] | 1591 | |
| 1592 | /* For now just support Ethernet, IPGRE, IP6GRE, SIT and |
| 1593 | * IPIP devices |
| 1594 | */ |
Simon Horman | 0d227a8 | 2016-06-16 17:09:09 +0900 | [diff] [blame] | 1595 | if (dev->type == ARPHRD_ETHER || |
| 1596 | dev->type == ARPHRD_LOOPBACK || |
Simon Horman | 407f31b | 2016-07-07 07:56:15 +0200 | [diff] [blame] | 1597 | dev->type == ARPHRD_IPGRE || |
Saif Hasan | d8e2262 | 2018-09-21 14:30:05 -0700 | [diff] [blame] | 1598 | dev->type == ARPHRD_IP6GRE || |
Simon Horman | 407f31b | 2016-07-07 07:56:15 +0200 | [diff] [blame] | 1599 | dev->type == ARPHRD_SIT || |
| 1600 | dev->type == ARPHRD_TUNNEL) { |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1601 | mdev = mpls_add_dev(dev); |
| 1602 | if (IS_ERR(mdev)) |
| 1603 | return notifier_from_errno(PTR_ERR(mdev)); |
| 1604 | } |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1605 | return NOTIFY_OK; |
| 1606 | } |
Robert Shearman | 03c5774 | 2015-04-22 11:14:37 +0100 | [diff] [blame] | 1607 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1608 | mdev = mpls_dev_get(dev); |
| 1609 | if (!mdev) |
| 1610 | return NOTIFY_OK; |
| 1611 | |
| 1612 | switch (event) { |
| 1613 | case NETDEV_DOWN: |
| 1614 | mpls_ifdown(dev, event); |
| 1615 | break; |
| 1616 | case NETDEV_UP: |
| 1617 | flags = dev_get_flags(dev); |
| 1618 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) |
| 1619 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); |
| 1620 | else |
| 1621 | mpls_ifup(dev, RTNH_F_DEAD); |
| 1622 | break; |
| 1623 | case NETDEV_CHANGE: |
| 1624 | flags = dev_get_flags(dev); |
| 1625 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) |
| 1626 | mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); |
| 1627 | else |
| 1628 | mpls_ifdown(dev, event); |
| 1629 | break; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1630 | case NETDEV_UNREGISTER: |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1631 | mpls_ifdown(dev, event); |
| 1632 | mdev = mpls_dev_get(dev); |
| 1633 | if (mdev) { |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1634 | mpls_dev_sysctl_unregister(dev, mdev); |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1635 | RCU_INIT_POINTER(dev->mpls_ptr, NULL); |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 1636 | call_rcu(&mdev->rcu, mpls_dev_destroy_rcu); |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 1637 | } |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1638 | break; |
Robert Shearman | 0fae3bf | 2015-06-11 19:58:26 +0100 | [diff] [blame] | 1639 | case NETDEV_CHANGENAME: |
| 1640 | mdev = mpls_dev_get(dev); |
| 1641 | if (mdev) { |
| 1642 | int err; |
| 1643 | |
David Ahern | 1182e4d0 | 2017-03-28 14:28:07 -0700 | [diff] [blame] | 1644 | mpls_dev_sysctl_unregister(dev, mdev); |
Robert Shearman | 0fae3bf | 2015-06-11 19:58:26 +0100 | [diff] [blame] | 1645 | err = mpls_dev_sysctl_register(dev, mdev); |
| 1646 | if (err) |
| 1647 | return notifier_from_errno(err); |
| 1648 | } |
| 1649 | break; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 1650 | } |
| 1651 | return NOTIFY_OK; |
| 1652 | } |
| 1653 | |
| 1654 | static struct notifier_block mpls_dev_notifier = { |
| 1655 | .notifier_call = mpls_dev_notify, |
| 1656 | }; |
| 1657 | |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1658 | static int nla_put_via(struct sk_buff *skb, |
Eric W. Biederman | b79bda3 | 2015-03-07 16:25:56 -0600 | [diff] [blame] | 1659 | u8 table, const void *addr, int alen) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1660 | { |
Eric W. Biederman | b79bda3 | 2015-03-07 16:25:56 -0600 | [diff] [blame] | 1661 | static const int table_to_family[NEIGH_NR_TABLES + 1] = { |
| 1662 | AF_INET, AF_INET6, AF_DECnet, AF_PACKET, |
| 1663 | }; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1664 | struct nlattr *nla; |
| 1665 | struct rtvia *via; |
Eric W. Biederman | b79bda3 | 2015-03-07 16:25:56 -0600 | [diff] [blame] | 1666 | int family = AF_UNSPEC; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1667 | |
| 1668 | nla = nla_reserve(skb, RTA_VIA, alen + 2); |
| 1669 | if (!nla) |
| 1670 | return -EMSGSIZE; |
| 1671 | |
Eric W. Biederman | b79bda3 | 2015-03-07 16:25:56 -0600 | [diff] [blame] | 1672 | if (table <= NEIGH_NR_TABLES) |
| 1673 | family = table_to_family[table]; |
| 1674 | |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1675 | via = nla_data(nla); |
| 1676 | via->rtvia_family = family; |
| 1677 | memcpy(via->rtvia_addr, addr, alen); |
| 1678 | return 0; |
| 1679 | } |
| 1680 | |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1681 | int nla_put_labels(struct sk_buff *skb, int attrtype, |
| 1682 | u8 labels, const u32 label[]) |
| 1683 | { |
| 1684 | struct nlattr *nla; |
| 1685 | struct mpls_shim_hdr *nla_label; |
| 1686 | bool bos; |
| 1687 | int i; |
| 1688 | nla = nla_reserve(skb, attrtype, labels*4); |
| 1689 | if (!nla) |
| 1690 | return -EMSGSIZE; |
| 1691 | |
| 1692 | nla_label = nla_data(nla); |
| 1693 | bos = true; |
| 1694 | for (i = labels - 1; i >= 0; i--) { |
| 1695 | nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); |
| 1696 | bos = false; |
| 1697 | } |
| 1698 | |
| 1699 | return 0; |
| 1700 | } |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 1701 | EXPORT_SYMBOL_GPL(nla_put_labels); |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1702 | |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1703 | int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, |
| 1704 | u32 label[], struct netlink_ext_ack *extack) |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1705 | { |
| 1706 | unsigned len = nla_len(nla); |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1707 | struct mpls_shim_hdr *nla_label; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1708 | u8 nla_labels; |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1709 | bool bos; |
| 1710 | int i; |
| 1711 | |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1712 | /* len needs to be an even multiple of 4 (the label size). Number |
| 1713 | * of labels is a u8 so check for overflow. |
| 1714 | */ |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1715 | if (len & 3 || len / 4 > 255) { |
| 1716 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 1717 | "Invalid length for labels attribute"); |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1718 | return -EINVAL; |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1719 | } |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1720 | |
| 1721 | /* Limit the number of new labels allowed */ |
| 1722 | nla_labels = len/4; |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1723 | if (nla_labels > max_labels) { |
| 1724 | NL_SET_ERR_MSG(extack, "Too many labels"); |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1725 | return -EINVAL; |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1726 | } |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1727 | |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1728 | /* when label == NULL, caller wants number of labels */ |
| 1729 | if (!label) |
| 1730 | goto out; |
| 1731 | |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1732 | nla_label = nla_data(nla); |
| 1733 | bos = true; |
| 1734 | for (i = nla_labels - 1; i >= 0; i--, bos = false) { |
| 1735 | struct mpls_entry_decoded dec; |
| 1736 | dec = mpls_entry_decode(nla_label + i); |
| 1737 | |
| 1738 | /* Ensure the bottom of stack flag is properly set |
| 1739 | * and ttl and tc are both clear. |
| 1740 | */ |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1741 | if (dec.ttl) { |
| 1742 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 1743 | "TTL in label must be 0"); |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1744 | return -EINVAL; |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1745 | } |
| 1746 | |
| 1747 | if (dec.tc) { |
| 1748 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 1749 | "Traffic class in label must be 0"); |
| 1750 | return -EINVAL; |
| 1751 | } |
| 1752 | |
| 1753 | if (dec.bos != bos) { |
| 1754 | NL_SET_BAD_ATTR(extack, nla); |
| 1755 | if (bos) { |
| 1756 | NL_SET_ERR_MSG(extack, |
| 1757 | "BOS bit must be set in first label"); |
| 1758 | } else { |
| 1759 | NL_SET_ERR_MSG(extack, |
| 1760 | "BOS bit can only be set in first label"); |
| 1761 | } |
| 1762 | return -EINVAL; |
| 1763 | } |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1764 | |
Robert Shearman | 5a9ab01 | 2015-04-22 11:14:39 +0100 | [diff] [blame] | 1765 | switch (dec.label) { |
Tom Herbert | 78f5b89 | 2015-05-07 08:08:51 -0700 | [diff] [blame] | 1766 | case MPLS_LABEL_IMPLNULL: |
Robert Shearman | 5a9ab01 | 2015-04-22 11:14:39 +0100 | [diff] [blame] | 1767 | /* RFC3032: This is a label that an LSR may |
| 1768 | * assign and distribute, but which never |
| 1769 | * actually appears in the encapsulation. |
| 1770 | */ |
David Ahern | a1f10ab | 2017-05-27 16:19:29 -0600 | [diff] [blame] | 1771 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 1772 | "Implicit NULL Label (3) can not be used in encapsulation"); |
Robert Shearman | 5a9ab01 | 2015-04-22 11:14:39 +0100 | [diff] [blame] | 1773 | return -EINVAL; |
| 1774 | } |
| 1775 | |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1776 | label[i] = dec.label; |
| 1777 | } |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1778 | out: |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1779 | *labels = nla_labels; |
| 1780 | return 0; |
| 1781 | } |
Roopa Prabhu | face018 | 2015-07-21 10:43:52 +0200 | [diff] [blame] | 1782 | EXPORT_SYMBOL_GPL(nla_get_labels); |
Eric W. Biederman | 966bae3 | 2015-03-03 19:13:19 -0600 | [diff] [blame] | 1783 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1784 | static int rtm_to_route_config(struct sk_buff *skb, |
| 1785 | struct nlmsghdr *nlh, |
| 1786 | struct mpls_route_config *cfg, |
| 1787 | struct netlink_ext_ack *extack) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1788 | { |
| 1789 | struct rtmsg *rtm; |
| 1790 | struct nlattr *tb[RTA_MAX+1]; |
| 1791 | int index; |
| 1792 | int err; |
| 1793 | |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 1794 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
| 1795 | rtm_mpls_policy, extack); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1796 | if (err < 0) |
| 1797 | goto errout; |
| 1798 | |
| 1799 | err = -EINVAL; |
| 1800 | rtm = nlmsg_data(nlh); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1801 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1802 | if (rtm->rtm_family != AF_MPLS) { |
| 1803 | NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1804 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1805 | } |
| 1806 | if (rtm->rtm_dst_len != 20) { |
| 1807 | NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1808 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1809 | } |
| 1810 | if (rtm->rtm_src_len != 0) { |
| 1811 | NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1812 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1813 | } |
| 1814 | if (rtm->rtm_tos != 0) { |
| 1815 | NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1816 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1817 | } |
| 1818 | if (rtm->rtm_table != RT_TABLE_MAIN) { |
| 1819 | NL_SET_ERR_MSG(extack, |
| 1820 | "MPLS only supports the main route table"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1821 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1822 | } |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1823 | /* Any value is acceptable for rtm_protocol */ |
| 1824 | |
| 1825 | /* As mpls uses destination specific addresses |
| 1826 | * (or source specific address in the case of multicast) |
| 1827 | * all addresses have universal scope. |
| 1828 | */ |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1829 | if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { |
| 1830 | NL_SET_ERR_MSG(extack, |
| 1831 | "Invalid route scope - MPLS only supports UNIVERSE"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1832 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1833 | } |
| 1834 | if (rtm->rtm_type != RTN_UNICAST) { |
| 1835 | NL_SET_ERR_MSG(extack, |
| 1836 | "Invalid route type - MPLS only supports UNICAST"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1837 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1838 | } |
| 1839 | if (rtm->rtm_flags != 0) { |
| 1840 | NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1841 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1842 | } |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1843 | |
| 1844 | cfg->rc_label = LABEL_NOT_SPECIFIED; |
| 1845 | cfg->rc_protocol = rtm->rtm_protocol; |
Robert Shearman | eb7809f | 2015-12-10 19:30:50 +0000 | [diff] [blame] | 1846 | cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 1847 | cfg->rc_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1848 | cfg->rc_nlflags = nlh->nlmsg_flags; |
| 1849 | cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; |
| 1850 | cfg->rc_nlinfo.nlh = nlh; |
| 1851 | cfg->rc_nlinfo.nl_net = sock_net(skb->sk); |
| 1852 | |
| 1853 | for (index = 0; index <= RTA_MAX; index++) { |
| 1854 | struct nlattr *nla = tb[index]; |
| 1855 | if (!nla) |
| 1856 | continue; |
| 1857 | |
Suraj Deshmukh | 14dd3e1 | 2016-12-03 07:59:26 +0000 | [diff] [blame] | 1858 | switch (index) { |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1859 | case RTA_OIF: |
| 1860 | cfg->rc_ifindex = nla_get_u32(nla); |
| 1861 | break; |
| 1862 | case RTA_NEWDST: |
| 1863 | if (nla_get_labels(nla, MAX_NEW_LABELS, |
| 1864 | &cfg->rc_output_labels, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1865 | cfg->rc_output_label, extack)) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1866 | goto errout; |
| 1867 | break; |
| 1868 | case RTA_DST: |
| 1869 | { |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1870 | u8 label_count; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1871 | if (nla_get_labels(nla, 1, &label_count, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1872 | &cfg->rc_label, extack)) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1873 | goto errout; |
| 1874 | |
David Ahern | b7b386f | 2017-05-27 16:19:30 -0600 | [diff] [blame] | 1875 | if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 1876 | &cfg->rc_label, extack)) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1877 | goto errout; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1878 | break; |
| 1879 | } |
David Ahern | be48220 | 2019-02-26 09:00:04 -0800 | [diff] [blame] | 1880 | case RTA_GATEWAY: |
| 1881 | NL_SET_ERR_MSG(extack, "MPLS does not support RTA_GATEWAY attribute"); |
| 1882 | goto errout; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1883 | case RTA_VIA: |
| 1884 | { |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1885 | if (nla_get_via(nla, &cfg->rc_via_alen, |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1886 | &cfg->rc_via_table, cfg->rc_via, |
| 1887 | extack)) |
Robert Shearman | f8d54af | 2015-03-06 10:47:00 +0000 | [diff] [blame] | 1888 | goto errout; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1889 | break; |
| 1890 | } |
| 1891 | case RTA_MULTIPATH: |
| 1892 | { |
| 1893 | cfg->rc_mp = nla_data(nla); |
| 1894 | cfg->rc_mp_len = nla_len(nla); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1895 | break; |
| 1896 | } |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 1897 | case RTA_TTL_PROPAGATE: |
| 1898 | { |
| 1899 | u8 ttl_propagate = nla_get_u8(nla); |
| 1900 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1901 | if (ttl_propagate > 1) { |
| 1902 | NL_SET_ERR_MSG_ATTR(extack, nla, |
| 1903 | "RTA_TTL_PROPAGATE can only be 0 or 1"); |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 1904 | goto errout; |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1905 | } |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 1906 | cfg->rc_ttl_propagate = ttl_propagate ? |
| 1907 | MPLS_TTL_PROP_ENABLED : |
| 1908 | MPLS_TTL_PROP_DISABLED; |
| 1909 | break; |
| 1910 | } |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1911 | default: |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1912 | NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1913 | /* Unsupported attribute */ |
| 1914 | goto errout; |
| 1915 | } |
| 1916 | } |
| 1917 | |
| 1918 | err = 0; |
| 1919 | errout: |
| 1920 | return err; |
| 1921 | } |
| 1922 | |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 1923 | static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1924 | struct netlink_ext_ack *extack) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1925 | { |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1926 | struct mpls_route_config *cfg; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1927 | int err; |
| 1928 | |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1929 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
| 1930 | if (!cfg) |
| 1931 | return -ENOMEM; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1932 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1933 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1934 | if (err < 0) |
| 1935 | goto out; |
| 1936 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1937 | err = mpls_route_del(cfg, extack); |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1938 | out: |
| 1939 | kfree(cfg); |
| 1940 | |
| 1941 | return err; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1942 | } |
| 1943 | |
| 1944 | |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 1945 | static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 1946 | struct netlink_ext_ack *extack) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1947 | { |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1948 | struct mpls_route_config *cfg; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1949 | int err; |
| 1950 | |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1951 | cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); |
| 1952 | if (!cfg) |
| 1953 | return -ENOMEM; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1954 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1955 | err = rtm_to_route_config(skb, nlh, cfg, extack); |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1956 | if (err < 0) |
| 1957 | goto out; |
| 1958 | |
David Ahern | 074350e | 2017-05-27 16:19:31 -0600 | [diff] [blame] | 1959 | err = mpls_route_add(cfg, extack); |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 1960 | out: |
| 1961 | kfree(cfg); |
| 1962 | |
| 1963 | return err; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1964 | } |
| 1965 | |
| 1966 | static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, |
| 1967 | u32 label, struct mpls_route *rt, int flags) |
| 1968 | { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 1969 | struct net_device *dev; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1970 | struct nlmsghdr *nlh; |
| 1971 | struct rtmsg *rtm; |
| 1972 | |
| 1973 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
| 1974 | if (nlh == NULL) |
| 1975 | return -EMSGSIZE; |
| 1976 | |
| 1977 | rtm = nlmsg_data(nlh); |
| 1978 | rtm->rtm_family = AF_MPLS; |
| 1979 | rtm->rtm_dst_len = 20; |
| 1980 | rtm->rtm_src_len = 0; |
| 1981 | rtm->rtm_tos = 0; |
| 1982 | rtm->rtm_table = RT_TABLE_MAIN; |
| 1983 | rtm->rtm_protocol = rt->rt_protocol; |
| 1984 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
| 1985 | rtm->rtm_type = RTN_UNICAST; |
| 1986 | rtm->rtm_flags = 0; |
| 1987 | |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 1988 | if (nla_put_labels(skb, RTA_DST, 1, &label)) |
| 1989 | goto nla_put_failure; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 1990 | |
| 1991 | if (rt->rt_ttl_propagate != MPLS_TTL_PROP_DEFAULT) { |
| 1992 | bool ttl_propagate = |
| 1993 | rt->rt_ttl_propagate == MPLS_TTL_PROP_ENABLED; |
| 1994 | |
| 1995 | if (nla_put_u8(skb, RTA_TTL_PROPAGATE, |
| 1996 | ttl_propagate)) |
| 1997 | goto nla_put_failure; |
| 1998 | } |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 1999 | if (rt->rt_nhn == 1) { |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 2000 | const struct mpls_nh *nh = rt->rt_nh; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2001 | |
| 2002 | if (nh->nh_labels && |
| 2003 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, |
| 2004 | nh->nh_label)) |
| 2005 | goto nla_put_failure; |
Robert Shearman | eb7809f | 2015-12-10 19:30:50 +0000 | [diff] [blame] | 2006 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
Robert Shearman | 72dcac9 | 2015-12-10 19:30:49 +0000 | [diff] [blame] | 2007 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2008 | nh->nh_via_alen)) |
| 2009 | goto nla_put_failure; |
| 2010 | dev = rtnl_dereference(nh->nh_dev); |
| 2011 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) |
| 2012 | goto nla_put_failure; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 2013 | if (nh->nh_flags & RTNH_F_LINKDOWN) |
| 2014 | rtm->rtm_flags |= RTNH_F_LINKDOWN; |
| 2015 | if (nh->nh_flags & RTNH_F_DEAD) |
| 2016 | rtm->rtm_flags |= RTNH_F_DEAD; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2017 | } else { |
| 2018 | struct rtnexthop *rtnh; |
| 2019 | struct nlattr *mp; |
David Ahern | 77ef013a | 2017-03-31 07:14:00 -0700 | [diff] [blame] | 2020 | u8 linkdown = 0; |
| 2021 | u8 dead = 0; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2022 | |
Michal Kubecek | ae0be8d | 2019-04-26 11:13:06 +0200 | [diff] [blame] | 2023 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2024 | if (!mp) |
| 2025 | goto nla_put_failure; |
| 2026 | |
| 2027 | for_nexthops(rt) { |
David Ahern | c00e51d | 2017-03-24 15:21:56 -0700 | [diff] [blame] | 2028 | dev = rtnl_dereference(nh->nh_dev); |
| 2029 | if (!dev) |
| 2030 | continue; |
| 2031 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2032 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); |
| 2033 | if (!rtnh) |
| 2034 | goto nla_put_failure; |
| 2035 | |
David Ahern | c00e51d | 2017-03-24 15:21:56 -0700 | [diff] [blame] | 2036 | rtnh->rtnh_ifindex = dev->ifindex; |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 2037 | if (nh->nh_flags & RTNH_F_LINKDOWN) { |
| 2038 | rtnh->rtnh_flags |= RTNH_F_LINKDOWN; |
| 2039 | linkdown++; |
| 2040 | } |
| 2041 | if (nh->nh_flags & RTNH_F_DEAD) { |
| 2042 | rtnh->rtnh_flags |= RTNH_F_DEAD; |
| 2043 | dead++; |
| 2044 | } |
| 2045 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2046 | if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, |
| 2047 | nh->nh_labels, |
| 2048 | nh->nh_label)) |
| 2049 | goto nla_put_failure; |
Robert Shearman | f20367d | 2015-12-10 19:30:51 +0000 | [diff] [blame] | 2050 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
| 2051 | nla_put_via(skb, nh->nh_via_table, |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 2052 | mpls_nh_via(rt, nh), |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2053 | nh->nh_via_alen)) |
| 2054 | goto nla_put_failure; |
| 2055 | |
| 2056 | /* length of rtnetlink header + attributes */ |
| 2057 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; |
| 2058 | } endfor_nexthops(rt); |
| 2059 | |
Roopa Prabhu | c89359a | 2015-12-01 22:18:11 -0800 | [diff] [blame] | 2060 | if (linkdown == rt->rt_nhn) |
| 2061 | rtm->rtm_flags |= RTNH_F_LINKDOWN; |
| 2062 | if (dead == rt->rt_nhn) |
| 2063 | rtm->rtm_flags |= RTNH_F_DEAD; |
| 2064 | |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2065 | nla_nest_end(skb, mp); |
| 2066 | } |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2067 | |
| 2068 | nlmsg_end(skb, nlh); |
| 2069 | return 0; |
| 2070 | |
| 2071 | nla_put_failure: |
| 2072 | nlmsg_cancel(skb, nlh); |
| 2073 | return -EMSGSIZE; |
| 2074 | } |
| 2075 | |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2076 | #if IS_ENABLED(CONFIG_INET) |
David Ahern | 4724676 | 2018-10-15 18:56:42 -0700 | [diff] [blame] | 2077 | static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
| 2078 | struct fib_dump_filter *filter, |
David Ahern | effe679 | 2018-10-15 18:56:48 -0700 | [diff] [blame] | 2079 | struct netlink_callback *cb) |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2080 | { |
David Ahern | effe679 | 2018-10-15 18:56:48 -0700 | [diff] [blame] | 2081 | return ip_valid_fib_dump_req(net, nlh, filter, cb); |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2082 | } |
| 2083 | #else |
David Ahern | 4724676 | 2018-10-15 18:56:42 -0700 | [diff] [blame] | 2084 | static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
| 2085 | struct fib_dump_filter *filter, |
David Ahern | effe679 | 2018-10-15 18:56:48 -0700 | [diff] [blame] | 2086 | struct netlink_callback *cb) |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2087 | { |
David Ahern | effe679 | 2018-10-15 18:56:48 -0700 | [diff] [blame] | 2088 | struct netlink_ext_ack *extack = cb->extack; |
David Ahern | 196cfeb | 2018-10-15 18:56:49 -0700 | [diff] [blame] | 2089 | struct nlattr *tb[RTA_MAX + 1]; |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2090 | struct rtmsg *rtm; |
David Ahern | 196cfeb | 2018-10-15 18:56:49 -0700 | [diff] [blame] | 2091 | int err, i; |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2092 | |
| 2093 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { |
| 2094 | NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); |
| 2095 | return -EINVAL; |
| 2096 | } |
| 2097 | |
| 2098 | rtm = nlmsg_data(nlh); |
| 2099 | if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || |
David Ahern | 196cfeb | 2018-10-15 18:56:49 -0700 | [diff] [blame] | 2100 | rtm->rtm_table || rtm->rtm_scope || rtm->rtm_type || |
| 2101 | rtm->rtm_flags) { |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2102 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); |
| 2103 | return -EINVAL; |
| 2104 | } |
| 2105 | |
David Ahern | 196cfeb | 2018-10-15 18:56:49 -0700 | [diff] [blame] | 2106 | if (rtm->rtm_protocol) { |
| 2107 | filter->protocol = rtm->rtm_protocol; |
| 2108 | filter->filter_set = 1; |
| 2109 | cb->answer_flags = NLM_F_DUMP_FILTERED; |
| 2110 | } |
| 2111 | |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 2112 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
| 2113 | rtm_mpls_policy, extack); |
David Ahern | 196cfeb | 2018-10-15 18:56:49 -0700 | [diff] [blame] | 2114 | if (err < 0) |
| 2115 | return err; |
| 2116 | |
| 2117 | for (i = 0; i <= RTA_MAX; ++i) { |
| 2118 | int ifindex; |
| 2119 | |
| 2120 | if (i == RTA_OIF) { |
| 2121 | ifindex = nla_get_u32(tb[i]); |
| 2122 | filter->dev = __dev_get_by_index(net, ifindex); |
| 2123 | if (!filter->dev) |
| 2124 | return -ENODEV; |
| 2125 | filter->filter_set = 1; |
| 2126 | } else if (tb[i]) { |
| 2127 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); |
| 2128 | return -EINVAL; |
| 2129 | } |
David Ahern | d8a66aa | 2018-10-09 11:10:43 -0700 | [diff] [blame] | 2130 | } |
| 2131 | |
| 2132 | return 0; |
| 2133 | } |
| 2134 | #endif |
| 2135 | |
David Ahern | bae9a78 | 2018-10-15 18:56:45 -0700 | [diff] [blame] | 2136 | static bool mpls_rt_uses_dev(struct mpls_route *rt, |
| 2137 | const struct net_device *dev) |
| 2138 | { |
| 2139 | struct net_device *nh_dev; |
| 2140 | |
| 2141 | if (rt->rt_nhn == 1) { |
| 2142 | struct mpls_nh *nh = rt->rt_nh; |
| 2143 | |
| 2144 | nh_dev = rtnl_dereference(nh->nh_dev); |
| 2145 | if (dev == nh_dev) |
| 2146 | return true; |
| 2147 | } else { |
| 2148 | for_nexthops(rt) { |
| 2149 | nh_dev = rtnl_dereference(nh->nh_dev); |
| 2150 | if (nh_dev == dev) |
| 2151 | return true; |
| 2152 | } endfor_nexthops(rt); |
| 2153 | } |
| 2154 | |
| 2155 | return false; |
| 2156 | } |
| 2157 | |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2158 | static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) |
| 2159 | { |
David Ahern | e8ba330 | 2018-10-07 20:16:35 -0700 | [diff] [blame] | 2160 | const struct nlmsghdr *nlh = cb->nlh; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2161 | struct net *net = sock_net(skb->sk); |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2162 | struct mpls_route __rcu **platform_label; |
David Ahern | 4724676 | 2018-10-15 18:56:42 -0700 | [diff] [blame] | 2163 | struct fib_dump_filter filter = {}; |
David Ahern | bae9a78 | 2018-10-15 18:56:45 -0700 | [diff] [blame] | 2164 | unsigned int flags = NLM_F_MULTI; |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2165 | size_t platform_labels; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2166 | unsigned int index; |
| 2167 | |
| 2168 | ASSERT_RTNL(); |
| 2169 | |
David Ahern | e8ba330 | 2018-10-07 20:16:35 -0700 | [diff] [blame] | 2170 | if (cb->strict_check) { |
David Ahern | 4724676 | 2018-10-15 18:56:42 -0700 | [diff] [blame] | 2171 | int err; |
David Ahern | e8ba330 | 2018-10-07 20:16:35 -0700 | [diff] [blame] | 2172 | |
David Ahern | effe679 | 2018-10-15 18:56:48 -0700 | [diff] [blame] | 2173 | err = mpls_valid_fib_dump_req(net, nlh, &filter, cb); |
David Ahern | e8ba330 | 2018-10-07 20:16:35 -0700 | [diff] [blame] | 2174 | if (err < 0) |
| 2175 | return err; |
David Ahern | bae9a78 | 2018-10-15 18:56:45 -0700 | [diff] [blame] | 2176 | |
| 2177 | /* for MPLS, there is only 1 table with fixed type and flags. |
| 2178 | * If either are set in the filter then return nothing. |
| 2179 | */ |
| 2180 | if ((filter.table_id && filter.table_id != RT_TABLE_MAIN) || |
| 2181 | (filter.rt_type && filter.rt_type != RTN_UNICAST) || |
| 2182 | filter.flags) |
| 2183 | return skb->len; |
David Ahern | e8ba330 | 2018-10-07 20:16:35 -0700 | [diff] [blame] | 2184 | } |
| 2185 | |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2186 | index = cb->args[0]; |
Robert Shearman | a6affd2 | 2015-08-03 17:50:04 +0100 | [diff] [blame] | 2187 | if (index < MPLS_LABEL_FIRST_UNRESERVED) |
| 2188 | index = MPLS_LABEL_FIRST_UNRESERVED; |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2189 | |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2190 | platform_label = rtnl_dereference(net->mpls.platform_label); |
| 2191 | platform_labels = net->mpls.platform_labels; |
David Ahern | bae9a78 | 2018-10-15 18:56:45 -0700 | [diff] [blame] | 2192 | |
| 2193 | if (filter.filter_set) |
| 2194 | flags |= NLM_F_DUMP_FILTERED; |
| 2195 | |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2196 | for (; index < platform_labels; index++) { |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2197 | struct mpls_route *rt; |
David Ahern | bae9a78 | 2018-10-15 18:56:45 -0700 | [diff] [blame] | 2198 | |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2199 | rt = rtnl_dereference(platform_label[index]); |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2200 | if (!rt) |
| 2201 | continue; |
| 2202 | |
David Ahern | bae9a78 | 2018-10-15 18:56:45 -0700 | [diff] [blame] | 2203 | if ((filter.dev && !mpls_rt_uses_dev(rt, filter.dev)) || |
| 2204 | (filter.protocol && rt->rt_protocol != filter.protocol)) |
| 2205 | continue; |
| 2206 | |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2207 | if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, |
| 2208 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
David Ahern | bae9a78 | 2018-10-15 18:56:45 -0700 | [diff] [blame] | 2209 | index, rt, flags) < 0) |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2210 | break; |
| 2211 | } |
| 2212 | cb->args[0] = index; |
| 2213 | |
| 2214 | return skb->len; |
| 2215 | } |
| 2216 | |
Eric W. Biederman | 8de147d | 2015-03-03 19:14:31 -0600 | [diff] [blame] | 2217 | static inline size_t lfib_nlmsg_size(struct mpls_route *rt) |
| 2218 | { |
| 2219 | size_t payload = |
| 2220 | NLMSG_ALIGN(sizeof(struct rtmsg)) |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 2221 | + nla_total_size(4) /* RTA_DST */ |
| 2222 | + nla_total_size(1); /* RTA_TTL_PROPAGATE */ |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2223 | |
| 2224 | if (rt->rt_nhn == 1) { |
| 2225 | struct mpls_nh *nh = rt->rt_nh; |
| 2226 | |
| 2227 | if (nh->nh_dev) |
| 2228 | payload += nla_total_size(4); /* RTA_OIF */ |
Robert Shearman | eb7809f | 2015-12-10 19:30:50 +0000 | [diff] [blame] | 2229 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ |
Robert Shearman | 72dcac9 | 2015-12-10 19:30:49 +0000 | [diff] [blame] | 2230 | payload += nla_total_size(2 + nh->nh_via_alen); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2231 | if (nh->nh_labels) /* RTA_NEWDST */ |
| 2232 | payload += nla_total_size(nh->nh_labels * 4); |
| 2233 | } else { |
| 2234 | /* each nexthop is packed in an attribute */ |
| 2235 | size_t nhsize = 0; |
| 2236 | |
| 2237 | for_nexthops(rt) { |
David Ahern | e944e97 | 2017-03-28 15:19:49 -0700 | [diff] [blame] | 2238 | if (!rtnl_dereference(nh->nh_dev)) |
| 2239 | continue; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2240 | nhsize += nla_total_size(sizeof(struct rtnexthop)); |
Robert Shearman | f20367d | 2015-12-10 19:30:51 +0000 | [diff] [blame] | 2241 | /* RTA_VIA */ |
| 2242 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) |
| 2243 | nhsize += nla_total_size(2 + nh->nh_via_alen); |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2244 | if (nh->nh_labels) |
| 2245 | nhsize += nla_total_size(nh->nh_labels * 4); |
| 2246 | } endfor_nexthops(rt); |
| 2247 | /* nested attribute */ |
| 2248 | payload += nla_total_size(nhsize); |
| 2249 | } |
| 2250 | |
Eric W. Biederman | 8de147d | 2015-03-03 19:14:31 -0600 | [diff] [blame] | 2251 | return payload; |
| 2252 | } |
| 2253 | |
| 2254 | static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, |
| 2255 | struct nlmsghdr *nlh, struct net *net, u32 portid, |
| 2256 | unsigned int nlm_flags) |
| 2257 | { |
| 2258 | struct sk_buff *skb; |
| 2259 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
| 2260 | int err = -ENOBUFS; |
| 2261 | |
| 2262 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); |
| 2263 | if (skb == NULL) |
| 2264 | goto errout; |
| 2265 | |
| 2266 | err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); |
| 2267 | if (err < 0) { |
| 2268 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ |
| 2269 | WARN_ON(err == -EMSGSIZE); |
| 2270 | kfree_skb(skb); |
| 2271 | goto errout; |
| 2272 | } |
| 2273 | rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); |
| 2274 | |
| 2275 | return; |
| 2276 | errout: |
| 2277 | if (err < 0) |
| 2278 | rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); |
| 2279 | } |
| 2280 | |
Jakub Kicinski | d77851b | 2019-01-18 10:46:25 -0800 | [diff] [blame] | 2281 | static int mpls_valid_getroute_req(struct sk_buff *skb, |
| 2282 | const struct nlmsghdr *nlh, |
| 2283 | struct nlattr **tb, |
| 2284 | struct netlink_ext_ack *extack) |
| 2285 | { |
| 2286 | struct rtmsg *rtm; |
| 2287 | int i, err; |
| 2288 | |
| 2289 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { |
| 2290 | NL_SET_ERR_MSG_MOD(extack, |
| 2291 | "Invalid header for get route request"); |
| 2292 | return -EINVAL; |
| 2293 | } |
| 2294 | |
| 2295 | if (!netlink_strict_get_check(skb)) |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 2296 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
| 2297 | rtm_mpls_policy, extack); |
Jakub Kicinski | d77851b | 2019-01-18 10:46:25 -0800 | [diff] [blame] | 2298 | |
| 2299 | rtm = nlmsg_data(nlh); |
| 2300 | if ((rtm->rtm_dst_len && rtm->rtm_dst_len != 20) || |
| 2301 | rtm->rtm_src_len || rtm->rtm_tos || rtm->rtm_table || |
| 2302 | rtm->rtm_protocol || rtm->rtm_scope || rtm->rtm_type) { |
| 2303 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); |
| 2304 | return -EINVAL; |
| 2305 | } |
| 2306 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { |
| 2307 | NL_SET_ERR_MSG_MOD(extack, |
| 2308 | "Invalid flags for get route request"); |
| 2309 | return -EINVAL; |
| 2310 | } |
| 2311 | |
Johannes Berg | 8cb0817 | 2019-04-26 14:07:28 +0200 | [diff] [blame] | 2312 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
| 2313 | rtm_mpls_policy, extack); |
Jakub Kicinski | d77851b | 2019-01-18 10:46:25 -0800 | [diff] [blame] | 2314 | if (err) |
| 2315 | return err; |
| 2316 | |
| 2317 | if ((tb[RTA_DST] || tb[RTA_NEWDST]) && !rtm->rtm_dst_len) { |
| 2318 | NL_SET_ERR_MSG_MOD(extack, "rtm_dst_len must be 20 for MPLS"); |
| 2319 | return -EINVAL; |
| 2320 | } |
| 2321 | |
| 2322 | for (i = 0; i <= RTA_MAX; i++) { |
| 2323 | if (!tb[i]) |
| 2324 | continue; |
| 2325 | |
| 2326 | switch (i) { |
| 2327 | case RTA_DST: |
| 2328 | case RTA_NEWDST: |
| 2329 | break; |
| 2330 | default: |
| 2331 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); |
| 2332 | return -EINVAL; |
| 2333 | } |
| 2334 | } |
| 2335 | |
| 2336 | return 0; |
| 2337 | } |
| 2338 | |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2339 | static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, |
| 2340 | struct netlink_ext_ack *extack) |
| 2341 | { |
| 2342 | struct net *net = sock_net(in_skb->sk); |
| 2343 | u32 portid = NETLINK_CB(in_skb).portid; |
Roopa Prabhu | a906c1a | 2017-07-07 11:21:49 -0700 | [diff] [blame] | 2344 | u32 in_label = LABEL_NOT_SPECIFIED; |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2345 | struct nlattr *tb[RTA_MAX + 1]; |
| 2346 | u32 labels[MAX_NEW_LABELS]; |
| 2347 | struct mpls_shim_hdr *hdr; |
| 2348 | unsigned int hdr_size = 0; |
| 2349 | struct net_device *dev; |
| 2350 | struct mpls_route *rt; |
| 2351 | struct rtmsg *rtm, *r; |
| 2352 | struct nlmsghdr *nlh; |
| 2353 | struct sk_buff *skb; |
| 2354 | struct mpls_nh *nh; |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2355 | u8 n_labels; |
Roopa Prabhu | a906c1a | 2017-07-07 11:21:49 -0700 | [diff] [blame] | 2356 | int err; |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2357 | |
Jakub Kicinski | d77851b | 2019-01-18 10:46:25 -0800 | [diff] [blame] | 2358 | err = mpls_valid_getroute_req(in_skb, in_nlh, tb, extack); |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2359 | if (err < 0) |
| 2360 | goto errout; |
| 2361 | |
| 2362 | rtm = nlmsg_data(in_nlh); |
| 2363 | |
| 2364 | if (tb[RTA_DST]) { |
| 2365 | u8 label_count; |
| 2366 | |
| 2367 | if (nla_get_labels(tb[RTA_DST], 1, &label_count, |
Roopa Prabhu | a906c1a | 2017-07-07 11:21:49 -0700 | [diff] [blame] | 2368 | &in_label, extack)) { |
| 2369 | err = -EINVAL; |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2370 | goto errout; |
Roopa Prabhu | a906c1a | 2017-07-07 11:21:49 -0700 | [diff] [blame] | 2371 | } |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2372 | |
Dan Williams | 3968523 | 2018-02-07 22:34:24 -0800 | [diff] [blame] | 2373 | if (!mpls_label_ok(net, &in_label, extack)) { |
Roopa Prabhu | a906c1a | 2017-07-07 11:21:49 -0700 | [diff] [blame] | 2374 | err = -EINVAL; |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2375 | goto errout; |
Roopa Prabhu | a906c1a | 2017-07-07 11:21:49 -0700 | [diff] [blame] | 2376 | } |
Roopa Prabhu | 397fc9e | 2017-07-03 15:31:21 -0700 | [diff] [blame] | 2377 | } |
| 2378 | |
| 2379 | rt = mpls_route_input_rcu(net, in_label); |
| 2380 | if (!rt) { |
| 2381 | err = -ENETUNREACH; |
| 2382 | goto errout; |
| 2383 | } |
| 2384 | |
| 2385 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { |
| 2386 | skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); |
| 2387 | if (!skb) { |
| 2388 | err = -ENOBUFS; |
| 2389 | goto errout; |
| 2390 | } |
| 2391 | |
| 2392 | err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, |
| 2393 | RTM_NEWROUTE, in_label, rt, 0); |
| 2394 | if (err < 0) { |
| 2395 | /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ |
| 2396 | WARN_ON(err == -EMSGSIZE); |
| 2397 | goto errout_free; |
| 2398 | } |
| 2399 | |
| 2400 | return rtnl_unicast(skb, net, portid); |
| 2401 | } |
| 2402 | |
| 2403 | if (tb[RTA_NEWDST]) { |
| 2404 | if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, |
| 2405 | labels, extack) != 0) { |
| 2406 | err = -EINVAL; |
| 2407 | goto errout; |
| 2408 | } |
| 2409 | |
| 2410 | hdr_size = n_labels * sizeof(struct mpls_shim_hdr); |
| 2411 | } |
| 2412 | |
| 2413 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 2414 | if (!skb) { |
| 2415 | err = -ENOBUFS; |
| 2416 | goto errout; |
| 2417 | } |
| 2418 | |
| 2419 | skb->protocol = htons(ETH_P_MPLS_UC); |
| 2420 | |
| 2421 | if (hdr_size) { |
| 2422 | bool bos; |
| 2423 | int i; |
| 2424 | |
| 2425 | if (skb_cow(skb, hdr_size)) { |
| 2426 | err = -ENOBUFS; |
| 2427 | goto errout_free; |
| 2428 | } |
| 2429 | |
| 2430 | skb_reserve(skb, hdr_size); |
| 2431 | skb_push(skb, hdr_size); |
| 2432 | skb_reset_network_header(skb); |
| 2433 | |
| 2434 | /* Push new labels */ |
| 2435 | hdr = mpls_hdr(skb); |
| 2436 | bos = true; |
| 2437 | for (i = n_labels - 1; i >= 0; i--) { |
| 2438 | hdr[i] = mpls_entry_encode(labels[i], |
| 2439 | 1, 0, bos); |
| 2440 | bos = false; |
| 2441 | } |
| 2442 | } |
| 2443 | |
| 2444 | nh = mpls_select_multipath(rt, skb); |
| 2445 | if (!nh) { |
| 2446 | err = -ENETUNREACH; |
| 2447 | goto errout_free; |
| 2448 | } |
| 2449 | |
| 2450 | if (hdr_size) { |
| 2451 | skb_pull(skb, hdr_size); |
| 2452 | skb_reset_network_header(skb); |
| 2453 | } |
| 2454 | |
| 2455 | nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, |
| 2456 | RTM_NEWROUTE, sizeof(*r), 0); |
| 2457 | if (!nlh) { |
| 2458 | err = -EMSGSIZE; |
| 2459 | goto errout_free; |
| 2460 | } |
| 2461 | |
| 2462 | r = nlmsg_data(nlh); |
| 2463 | r->rtm_family = AF_MPLS; |
| 2464 | r->rtm_dst_len = 20; |
| 2465 | r->rtm_src_len = 0; |
| 2466 | r->rtm_table = RT_TABLE_MAIN; |
| 2467 | r->rtm_type = RTN_UNICAST; |
| 2468 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2469 | r->rtm_protocol = rt->rt_protocol; |
| 2470 | r->rtm_flags = 0; |
| 2471 | |
| 2472 | if (nla_put_labels(skb, RTA_DST, 1, &in_label)) |
| 2473 | goto nla_put_failure; |
| 2474 | |
| 2475 | if (nh->nh_labels && |
| 2476 | nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, |
| 2477 | nh->nh_label)) |
| 2478 | goto nla_put_failure; |
| 2479 | |
| 2480 | if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && |
| 2481 | nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), |
| 2482 | nh->nh_via_alen)) |
| 2483 | goto nla_put_failure; |
| 2484 | dev = rtnl_dereference(nh->nh_dev); |
| 2485 | if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) |
| 2486 | goto nla_put_failure; |
| 2487 | |
| 2488 | nlmsg_end(skb, nlh); |
| 2489 | |
| 2490 | err = rtnl_unicast(skb, net, portid); |
| 2491 | errout: |
| 2492 | return err; |
| 2493 | |
| 2494 | nla_put_failure: |
| 2495 | nlmsg_cancel(skb, nlh); |
| 2496 | err = -EMSGSIZE; |
| 2497 | errout_free: |
| 2498 | kfree_skb(skb); |
| 2499 | return err; |
| 2500 | } |
| 2501 | |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2502 | static int resize_platform_label_table(struct net *net, size_t limit) |
| 2503 | { |
| 2504 | size_t size = sizeof(struct mpls_route *) * limit; |
| 2505 | size_t old_limit; |
| 2506 | size_t cp_size; |
| 2507 | struct mpls_route __rcu **labels = NULL, **old; |
| 2508 | struct mpls_route *rt0 = NULL, *rt2 = NULL; |
| 2509 | unsigned index; |
| 2510 | |
| 2511 | if (size) { |
Michal Hocko | 752ade6 | 2017-05-08 15:57:27 -0700 | [diff] [blame] | 2512 | labels = kvzalloc(size, GFP_KERNEL); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2513 | if (!labels) |
| 2514 | goto nolabels; |
| 2515 | } |
| 2516 | |
| 2517 | /* In case the predefined labels need to be populated */ |
Tom Herbert | 78f5b89 | 2015-05-07 08:08:51 -0700 | [diff] [blame] | 2518 | if (limit > MPLS_LABEL_IPV4NULL) { |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2519 | struct net_device *lo = net->loopback_dev; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 2520 | rt0 = mpls_rt_alloc(1, lo->addr_len, 0); |
David Ahern | df1c631 | 2017-03-31 07:14:02 -0700 | [diff] [blame] | 2521 | if (IS_ERR(rt0)) |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2522 | goto nort0; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2523 | RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2524 | rt0->rt_protocol = RTPROT_KERNEL; |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 2525 | rt0->rt_payload_type = MPT_IPV4; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 2526 | rt0->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2527 | rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
Robert Shearman | b4e04fc | 2015-10-27 00:37:35 +0000 | [diff] [blame] | 2528 | rt0->rt_nh->nh_via_alen = lo->addr_len; |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 2529 | memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, |
| 2530 | lo->addr_len); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2531 | } |
Tom Herbert | 78f5b89 | 2015-05-07 08:08:51 -0700 | [diff] [blame] | 2532 | if (limit > MPLS_LABEL_IPV6NULL) { |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2533 | struct net_device *lo = net->loopback_dev; |
David Ahern | a4ac8c9 | 2017-03-31 07:14:03 -0700 | [diff] [blame] | 2534 | rt2 = mpls_rt_alloc(1, lo->addr_len, 0); |
David Ahern | df1c631 | 2017-03-31 07:14:02 -0700 | [diff] [blame] | 2535 | if (IS_ERR(rt2)) |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2536 | goto nort2; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2537 | RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2538 | rt2->rt_protocol = RTPROT_KERNEL; |
Robert Shearman | 118d523 | 2015-08-06 11:04:56 +0100 | [diff] [blame] | 2539 | rt2->rt_payload_type = MPT_IPV6; |
David Ahern | 6a18c31 | 2017-03-23 19:02:27 -0600 | [diff] [blame] | 2540 | rt2->rt_ttl_propagate = MPLS_TTL_PROP_DEFAULT; |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2541 | rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; |
Robert Shearman | b4e04fc | 2015-10-27 00:37:35 +0000 | [diff] [blame] | 2542 | rt2->rt_nh->nh_via_alen = lo->addr_len; |
Robert Shearman | cf4b24f | 2015-10-27 00:37:36 +0000 | [diff] [blame] | 2543 | memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, |
| 2544 | lo->addr_len); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2545 | } |
| 2546 | |
| 2547 | rtnl_lock(); |
| 2548 | /* Remember the original table */ |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2549 | old = rtnl_dereference(net->mpls.platform_label); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2550 | old_limit = net->mpls.platform_labels; |
| 2551 | |
| 2552 | /* Free any labels beyond the new table */ |
| 2553 | for (index = limit; index < old_limit; index++) |
Roopa Prabhu | f8efb73 | 2015-10-23 06:03:27 -0700 | [diff] [blame] | 2554 | mpls_route_update(net, index, NULL, NULL); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2555 | |
| 2556 | /* Copy over the old labels */ |
| 2557 | cp_size = size; |
| 2558 | if (old_limit < limit) |
| 2559 | cp_size = old_limit * sizeof(struct mpls_route *); |
| 2560 | |
| 2561 | memcpy(labels, old, cp_size); |
| 2562 | |
| 2563 | /* If needed set the predefined labels */ |
Tom Herbert | 78f5b89 | 2015-05-07 08:08:51 -0700 | [diff] [blame] | 2564 | if ((old_limit <= MPLS_LABEL_IPV6NULL) && |
| 2565 | (limit > MPLS_LABEL_IPV6NULL)) { |
| 2566 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2567 | rt2 = NULL; |
| 2568 | } |
| 2569 | |
Tom Herbert | 78f5b89 | 2015-05-07 08:08:51 -0700 | [diff] [blame] | 2570 | if ((old_limit <= MPLS_LABEL_IPV4NULL) && |
| 2571 | (limit > MPLS_LABEL_IPV4NULL)) { |
| 2572 | RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2573 | rt0 = NULL; |
| 2574 | } |
| 2575 | |
| 2576 | /* Update the global pointers */ |
| 2577 | net->mpls.platform_labels = limit; |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2578 | rcu_assign_pointer(net->mpls.platform_label, labels); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2579 | |
| 2580 | rtnl_unlock(); |
| 2581 | |
| 2582 | mpls_rt_free(rt2); |
| 2583 | mpls_rt_free(rt0); |
| 2584 | |
| 2585 | if (old) { |
| 2586 | synchronize_rcu(); |
| 2587 | kvfree(old); |
| 2588 | } |
| 2589 | return 0; |
| 2590 | |
| 2591 | nort2: |
| 2592 | mpls_rt_free(rt0); |
| 2593 | nort0: |
| 2594 | kvfree(labels); |
| 2595 | nolabels: |
| 2596 | return -ENOMEM; |
| 2597 | } |
| 2598 | |
| 2599 | static int mpls_platform_labels(struct ctl_table *table, int write, |
| 2600 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2601 | { |
| 2602 | struct net *net = table->data; |
| 2603 | int platform_labels = net->mpls.platform_labels; |
| 2604 | int ret; |
| 2605 | struct ctl_table tmp = { |
| 2606 | .procname = table->procname, |
| 2607 | .data = &platform_labels, |
| 2608 | .maxlen = sizeof(int), |
| 2609 | .mode = table->mode, |
| 2610 | .extra1 = &zero, |
| 2611 | .extra2 = &label_limit, |
| 2612 | }; |
| 2613 | |
| 2614 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| 2615 | |
| 2616 | if (write && ret == 0) |
| 2617 | ret = resize_platform_label_table(net, platform_labels); |
| 2618 | |
| 2619 | return ret; |
| 2620 | } |
| 2621 | |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 2622 | #define MPLS_NS_SYSCTL_OFFSET(field) \ |
| 2623 | (&((struct net *)0)->field) |
| 2624 | |
Robert Shearman | 37bde79 | 2015-04-22 11:14:38 +0100 | [diff] [blame] | 2625 | static const struct ctl_table mpls_table[] = { |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2626 | { |
| 2627 | .procname = "platform_labels", |
| 2628 | .data = NULL, |
| 2629 | .maxlen = sizeof(int), |
| 2630 | .mode = 0644, |
| 2631 | .proc_handler = mpls_platform_labels, |
| 2632 | }, |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 2633 | { |
| 2634 | .procname = "ip_ttl_propagate", |
| 2635 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate), |
| 2636 | .maxlen = sizeof(int), |
| 2637 | .mode = 0644, |
| 2638 | .proc_handler = proc_dointvec_minmax, |
| 2639 | .extra1 = &zero, |
| 2640 | .extra2 = &one, |
| 2641 | }, |
Robert Shearman | a59166e | 2017-03-10 20:43:25 +0000 | [diff] [blame] | 2642 | { |
| 2643 | .procname = "default_ttl", |
| 2644 | .data = MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl), |
| 2645 | .maxlen = sizeof(int), |
| 2646 | .mode = 0644, |
| 2647 | .proc_handler = proc_dointvec_minmax, |
| 2648 | .extra1 = &one, |
| 2649 | .extra2 = &ttl_max, |
| 2650 | }, |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2651 | { } |
| 2652 | }; |
| 2653 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2654 | static int mpls_net_init(struct net *net) |
| 2655 | { |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2656 | struct ctl_table *table; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 2657 | int i; |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2658 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2659 | net->mpls.platform_labels = 0; |
| 2660 | net->mpls.platform_label = NULL; |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 2661 | net->mpls.ip_ttl_propagate = 1; |
Robert Shearman | a59166e | 2017-03-10 20:43:25 +0000 | [diff] [blame] | 2662 | net->mpls.default_ttl = 255; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2663 | |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2664 | table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); |
| 2665 | if (table == NULL) |
| 2666 | return -ENOMEM; |
| 2667 | |
Robert Shearman | 5b441ac | 2017-03-10 20:43:24 +0000 | [diff] [blame] | 2668 | /* Table data contains only offsets relative to the base of |
| 2669 | * the mdev at this point, so make them absolute. |
| 2670 | */ |
| 2671 | for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++) |
| 2672 | table[i].data = (char *)net + (uintptr_t)table[i].data; |
| 2673 | |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2674 | net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); |
Nikolay Aleksandrov | 6ea3c9d5 | 2015-08-31 10:44:19 -0700 | [diff] [blame] | 2675 | if (net->mpls.ctl == NULL) { |
| 2676 | kfree(table); |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2677 | return -ENOMEM; |
Nikolay Aleksandrov | 6ea3c9d5 | 2015-08-31 10:44:19 -0700 | [diff] [blame] | 2678 | } |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2679 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2680 | return 0; |
| 2681 | } |
| 2682 | |
| 2683 | static void mpls_net_exit(struct net *net) |
| 2684 | { |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2685 | struct mpls_route __rcu **platform_label; |
| 2686 | size_t platform_labels; |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2687 | struct ctl_table *table; |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2688 | unsigned int index; |
| 2689 | |
Eric W. Biederman | 7720c01 | 2015-03-03 19:11:20 -0600 | [diff] [blame] | 2690 | table = net->mpls.ctl->ctl_table_arg; |
| 2691 | unregister_net_sysctl_table(net->mpls.ctl); |
| 2692 | kfree(table); |
| 2693 | |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2694 | /* An rcu grace period has passed since there was a device in |
| 2695 | * the network namespace (and thus the last in flight packet) |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2696 | * left this network namespace. This is because |
| 2697 | * unregister_netdevice_many and netdev_run_todo has completed |
| 2698 | * for each network device that was in this network namespace. |
| 2699 | * |
| 2700 | * As such no additional rcu synchronization is necessary when |
| 2701 | * freeing the platform_label table. |
| 2702 | */ |
| 2703 | rtnl_lock(); |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2704 | platform_label = rtnl_dereference(net->mpls.platform_label); |
| 2705 | platform_labels = net->mpls.platform_labels; |
| 2706 | for (index = 0; index < platform_labels; index++) { |
| 2707 | struct mpls_route *rt = rtnl_dereference(platform_label[index]); |
| 2708 | RCU_INIT_POINTER(platform_label[index], NULL); |
David Ahern | e37791e | 2017-03-10 09:46:15 -0800 | [diff] [blame] | 2709 | mpls_notify_route(net, index, rt, NULL, NULL); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2710 | mpls_rt_free(rt); |
| 2711 | } |
| 2712 | rtnl_unlock(); |
| 2713 | |
Eric W. Biederman | 19d0c34 | 2015-03-07 16:21:56 -0600 | [diff] [blame] | 2714 | kvfree(platform_label); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2715 | } |
| 2716 | |
| 2717 | static struct pernet_operations mpls_net_ops = { |
| 2718 | .init = mpls_net_init, |
| 2719 | .exit = mpls_net_exit, |
| 2720 | }; |
| 2721 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 2722 | static struct rtnl_af_ops mpls_af_ops __read_mostly = { |
| 2723 | .family = AF_MPLS, |
| 2724 | .fill_stats_af = mpls_fill_stats_af, |
| 2725 | .get_stats_af_size = mpls_get_stats_af_size, |
| 2726 | }; |
| 2727 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2728 | static int __init mpls_init(void) |
| 2729 | { |
| 2730 | int err; |
| 2731 | |
| 2732 | BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); |
| 2733 | |
| 2734 | err = register_pernet_subsys(&mpls_net_ops); |
| 2735 | if (err) |
| 2736 | goto out; |
| 2737 | |
| 2738 | err = register_netdevice_notifier(&mpls_dev_notifier); |
| 2739 | if (err) |
| 2740 | goto out_unregister_pernet; |
| 2741 | |
| 2742 | dev_add_pack(&mpls_packet_type); |
| 2743 | |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 2744 | rtnl_af_register(&mpls_af_ops); |
| 2745 | |
Florian Westphal | c1c502b | 2017-12-02 21:44:07 +0100 | [diff] [blame] | 2746 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, |
| 2747 | mpls_rtm_newroute, NULL, 0); |
| 2748 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, |
| 2749 | mpls_rtm_delroute, NULL, 0); |
| 2750 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, |
| 2751 | mpls_getroute, mpls_dump_routes, 0); |
| 2752 | rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, |
| 2753 | mpls_netconf_get_devconf, |
| 2754 | mpls_netconf_dump_devconf, 0); |
Amine Kherbouche | bdc4764 | 2017-10-04 19:35:57 +0200 | [diff] [blame] | 2755 | err = ipgre_tunnel_encap_add_mpls_ops(); |
| 2756 | if (err) |
| 2757 | pr_err("Can't add mpls over gre tunnel ops\n"); |
| 2758 | |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2759 | err = 0; |
| 2760 | out: |
| 2761 | return err; |
| 2762 | |
| 2763 | out_unregister_pernet: |
| 2764 | unregister_pernet_subsys(&mpls_net_ops); |
| 2765 | goto out; |
| 2766 | } |
| 2767 | module_init(mpls_init); |
| 2768 | |
| 2769 | static void __exit mpls_exit(void) |
| 2770 | { |
Eric W. Biederman | 03c0566 | 2015-03-03 19:13:56 -0600 | [diff] [blame] | 2771 | rtnl_unregister_all(PF_MPLS); |
Robert Shearman | 27d6910 | 2017-01-16 14:16:37 +0000 | [diff] [blame] | 2772 | rtnl_af_unregister(&mpls_af_ops); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2773 | dev_remove_pack(&mpls_packet_type); |
| 2774 | unregister_netdevice_notifier(&mpls_dev_notifier); |
| 2775 | unregister_pernet_subsys(&mpls_net_ops); |
Amine Kherbouche | bdc4764 | 2017-10-04 19:35:57 +0200 | [diff] [blame] | 2776 | ipgre_tunnel_encap_del_mpls_ops(); |
Eric W. Biederman | 0189197 | 2015-03-03 19:10:47 -0600 | [diff] [blame] | 2777 | } |
| 2778 | module_exit(mpls_exit); |
| 2779 | |
| 2780 | MODULE_DESCRIPTION("MultiProtocol Label Switching"); |
| 2781 | MODULE_LICENSE("GPL v2"); |
| 2782 | MODULE_ALIAS_NETPROTO(PF_MPLS); |