| /* |
| * Copyright (c) 2013 Nicira, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/in.h> |
| #include <linux/if_arp.h> |
| #include <linux/init.h> |
| #include <linux/in6.h> |
| #include <linux/inetdevice.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/etherdevice.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_vlan.h> |
| #include <linux/static_key.h> |
| |
| #include <net/ip.h> |
| #include <net/icmp.h> |
| #include <net/protocol.h> |
| #include <net/ip_tunnels.h> |
| #include <net/ip6_tunnel.h> |
| #include <net/arp.h> |
| #include <net/checksum.h> |
| #include <net/dsfield.h> |
| #include <net/inet_ecn.h> |
| #include <net/xfrm.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| #include <net/rtnetlink.h> |
| #include <net/dst_metadata.h> |
| |
| const struct ip_tunnel_encap_ops __rcu * |
| iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; |
| EXPORT_SYMBOL(iptun_encaps); |
| |
| const struct ip6_tnl_encap_ops __rcu * |
| ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; |
| EXPORT_SYMBOL(ip6tun_encaps); |
| |
| void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
| __be32 src, __be32 dst, __u8 proto, |
| __u8 tos, __u8 ttl, __be16 df, bool xnet) |
| { |
| int pkt_len = skb->len - skb_inner_network_offset(skb); |
| struct net *net = dev_net(rt->dst.dev); |
| struct net_device *dev = skb->dev; |
| int skb_iif = skb->skb_iif; |
| struct iphdr *iph; |
| int err; |
| |
| skb_scrub_packet(skb, xnet); |
| |
| skb_clear_hash(skb); |
| skb_dst_set(skb, &rt->dst); |
| memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| |
| if (skb_iif && proto == IPPROTO_UDP) { |
| /* Arrived from an ingress interface and got udp encapuslated. |
| * The encapsulated network segment length may exceed dst mtu. |
| * Allow IP Fragmentation of segments. |
| */ |
| IPCB(skb)->flags |= IPSKB_FRAG_SEGS; |
| } |
| |
| /* Push down and install the IP header. */ |
| skb_push(skb, sizeof(struct iphdr)); |
| skb_reset_network_header(skb); |
| |
| iph = ip_hdr(skb); |
| |
| iph->version = 4; |
| iph->ihl = sizeof(struct iphdr) >> 2; |
| iph->frag_off = df; |
| iph->protocol = proto; |
| iph->tos = tos; |
| iph->daddr = dst; |
| iph->saddr = src; |
| iph->ttl = ttl; |
| __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); |
| |
| err = ip_local_out(net, sk, skb); |
| if (unlikely(net_xmit_eval(err))) |
| pkt_len = 0; |
| iptunnel_xmit_stats(dev, pkt_len); |
| } |
| EXPORT_SYMBOL_GPL(iptunnel_xmit); |
| |
| int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, |
| __be16 inner_proto, bool raw_proto, bool xnet) |
| { |
| if (unlikely(!pskb_may_pull(skb, hdr_len))) |
| return -ENOMEM; |
| |
| skb_pull_rcsum(skb, hdr_len); |
| |
| if (!raw_proto && inner_proto == htons(ETH_P_TEB)) { |
| struct ethhdr *eh; |
| |
| if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
| return -ENOMEM; |
| |
| eh = (struct ethhdr *)skb->data; |
| if (likely(eth_proto_is_802_3(eh->h_proto))) |
| skb->protocol = eh->h_proto; |
| else |
| skb->protocol = htons(ETH_P_802_2); |
| |
| } else { |
| skb->protocol = inner_proto; |
| } |
| |
| skb_clear_hash_if_not_l4(skb); |
| skb->vlan_tci = 0; |
| skb_set_queue_mapping(skb, 0); |
| skb_scrub_packet(skb, xnet); |
| |
| return iptunnel_pull_offloads(skb); |
| } |
| EXPORT_SYMBOL_GPL(__iptunnel_pull_header); |
| |
| struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, |
| gfp_t flags) |
| { |
| struct metadata_dst *res; |
| struct ip_tunnel_info *dst, *src; |
| |
| if (!md || md->u.tun_info.mode & IP_TUNNEL_INFO_TX) |
| return NULL; |
| |
| res = metadata_dst_alloc(0, flags); |
| if (!res) |
| return NULL; |
| |
| dst = &res->u.tun_info; |
| src = &md->u.tun_info; |
| dst->key.tun_id = src->key.tun_id; |
| if (src->mode & IP_TUNNEL_INFO_IPV6) |
| memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src, |
| sizeof(struct in6_addr)); |
| else |
| dst->key.u.ipv4.dst = src->key.u.ipv4.src; |
| dst->mode = src->mode | IP_TUNNEL_INFO_TX; |
| |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); |
| |
| int iptunnel_handle_offloads(struct sk_buff *skb, |
| int gso_type_mask) |
| { |
| int err; |
| |
| if (likely(!skb->encapsulation)) { |
| skb_reset_inner_headers(skb); |
| skb->encapsulation = 1; |
| } |
| |
| if (skb_is_gso(skb)) { |
| err = skb_header_unclone(skb, GFP_ATOMIC); |
| if (unlikely(err)) |
| return err; |
| skb_shinfo(skb)->gso_type |= gso_type_mask; |
| return 0; |
| } |
| |
| if (skb->ip_summed != CHECKSUM_PARTIAL) { |
| skb->ip_summed = CHECKSUM_NONE; |
| /* We clear encapsulation here to prevent badly-written |
| * drivers potentially deciding to offload an inner checksum |
| * if we set CHECKSUM_PARTIAL on the outer header. |
| * This should go away when the drivers are all fixed. |
| */ |
| skb->encapsulation = 0; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); |
| |
| /* Often modified stats are per cpu, other are shared (netdev->stats) */ |
| struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, |
| struct rtnl_link_stats64 *tot) |
| { |
| int i; |
| |
| netdev_stats_to_stats64(tot, &dev->stats); |
| |
| for_each_possible_cpu(i) { |
| const struct pcpu_sw_netstats *tstats = |
| per_cpu_ptr(dev->tstats, i); |
| u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| unsigned int start; |
| |
| do { |
| start = u64_stats_fetch_begin_irq(&tstats->syncp); |
| rx_packets = tstats->rx_packets; |
| tx_packets = tstats->tx_packets; |
| rx_bytes = tstats->rx_bytes; |
| tx_bytes = tstats->tx_bytes; |
| } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
| |
| tot->rx_packets += rx_packets; |
| tot->tx_packets += tx_packets; |
| tot->rx_bytes += rx_bytes; |
| tot->tx_bytes += tx_bytes; |
| } |
| |
| return tot; |
| } |
| EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); |
| |
| static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = { |
| [LWTUNNEL_IP_ID] = { .type = NLA_U64 }, |
| [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, |
| [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, |
| [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, |
| [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, |
| [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, |
| }; |
| |
| static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr, |
| unsigned int family, const void *cfg, |
| struct lwtunnel_state **ts) |
| { |
| struct ip_tunnel_info *tun_info; |
| struct lwtunnel_state *new_state; |
| struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; |
| int err; |
| |
| err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy); |
| if (err < 0) |
| return err; |
| |
| new_state = lwtunnel_state_alloc(sizeof(*tun_info)); |
| if (!new_state) |
| return -ENOMEM; |
| |
| new_state->type = LWTUNNEL_ENCAP_IP; |
| |
| tun_info = lwt_tun_info(new_state); |
| |
| if (tb[LWTUNNEL_IP_ID]) |
| tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); |
| |
| if (tb[LWTUNNEL_IP_DST]) |
| tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]); |
| |
| if (tb[LWTUNNEL_IP_SRC]) |
| tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]); |
| |
| if (tb[LWTUNNEL_IP_TTL]) |
| tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); |
| |
| if (tb[LWTUNNEL_IP_TOS]) |
| tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); |
| |
| if (tb[LWTUNNEL_IP_FLAGS]) |
| tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]); |
| |
| tun_info->mode = IP_TUNNEL_INFO_TX; |
| tun_info->options_len = 0; |
| |
| *ts = new_state; |
| |
| return 0; |
| } |
| |
| static int ip_tun_fill_encap_info(struct sk_buff *skb, |
| struct lwtunnel_state *lwtstate) |
| { |
| struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); |
| |
| if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id, |
| LWTUNNEL_IP_PAD) || |
| nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || |
| nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || |
| nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || |
| nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || |
| nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) |
| { |
| return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */ |
| + nla_total_size(4) /* LWTUNNEL_IP_DST */ |
| + nla_total_size(4) /* LWTUNNEL_IP_SRC */ |
| + nla_total_size(1) /* LWTUNNEL_IP_TOS */ |
| + nla_total_size(1) /* LWTUNNEL_IP_TTL */ |
| + nla_total_size(2); /* LWTUNNEL_IP_FLAGS */ |
| } |
| |
| static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) |
| { |
| return memcmp(lwt_tun_info(a), lwt_tun_info(b), |
| sizeof(struct ip_tunnel_info)); |
| } |
| |
| static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { |
| .build_state = ip_tun_build_state, |
| .fill_encap = ip_tun_fill_encap_info, |
| .get_encap_size = ip_tun_encap_nlsize, |
| .cmp_encap = ip_tun_cmp_encap, |
| }; |
| |
| static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { |
| [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, |
| [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, |
| [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, |
| [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, |
| [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, |
| [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, |
| }; |
| |
| static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr, |
| unsigned int family, const void *cfg, |
| struct lwtunnel_state **ts) |
| { |
| struct ip_tunnel_info *tun_info; |
| struct lwtunnel_state *new_state; |
| struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; |
| int err; |
| |
| err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy); |
| if (err < 0) |
| return err; |
| |
| new_state = lwtunnel_state_alloc(sizeof(*tun_info)); |
| if (!new_state) |
| return -ENOMEM; |
| |
| new_state->type = LWTUNNEL_ENCAP_IP6; |
| |
| tun_info = lwt_tun_info(new_state); |
| |
| if (tb[LWTUNNEL_IP6_ID]) |
| tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); |
| |
| if (tb[LWTUNNEL_IP6_DST]) |
| tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); |
| |
| if (tb[LWTUNNEL_IP6_SRC]) |
| tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); |
| |
| if (tb[LWTUNNEL_IP6_HOPLIMIT]) |
| tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); |
| |
| if (tb[LWTUNNEL_IP6_TC]) |
| tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); |
| |
| if (tb[LWTUNNEL_IP6_FLAGS]) |
| tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]); |
| |
| tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; |
| tun_info->options_len = 0; |
| |
| *ts = new_state; |
| |
| return 0; |
| } |
| |
| static int ip6_tun_fill_encap_info(struct sk_buff *skb, |
| struct lwtunnel_state *lwtstate) |
| { |
| struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); |
| |
| if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id, |
| LWTUNNEL_IP6_PAD) || |
| nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || |
| nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || |
| nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || |
| nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || |
| nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) |
| { |
| return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */ |
| + nla_total_size(16) /* LWTUNNEL_IP6_DST */ |
| + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ |
| + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ |
| + nla_total_size(1) /* LWTUNNEL_IP6_TC */ |
| + nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */ |
| } |
| |
| static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { |
| .build_state = ip6_tun_build_state, |
| .fill_encap = ip6_tun_fill_encap_info, |
| .get_encap_size = ip6_tun_encap_nlsize, |
| .cmp_encap = ip_tun_cmp_encap, |
| }; |
| |
| void __init ip_tunnel_core_init(void) |
| { |
| /* If you land here, make sure whether increasing ip_tunnel_info's |
| * options_len is a reasonable choice with its usage in front ends |
| * (f.e., it's part of flow keys, etc). |
| */ |
| BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); |
| |
| lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); |
| lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); |
| } |
| |
| struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE; |
| EXPORT_SYMBOL(ip_tunnel_metadata_cnt); |
| |
| void ip_tunnel_need_metadata(void) |
| { |
| static_key_slow_inc(&ip_tunnel_metadata_cnt); |
| } |
| EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); |
| |
| void ip_tunnel_unneed_metadata(void) |
| { |
| static_key_slow_dec(&ip_tunnel_metadata_cnt); |
| } |
| EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); |