| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * IPv6 tunneling device |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Ville Nuorvala <vnuorval@tcs.hut.fi> |
| * Yasuyuki Kozakai <kozakai@linux-ipv6.org> |
| * |
| * Based on: |
| * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c |
| * |
| * RFC 2473 |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/sockios.h> |
| #include <linux/icmp.h> |
| #include <linux/if.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/net.h> |
| #include <linux/in6.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/icmpv6.h> |
| #include <linux/init.h> |
| #include <linux/route.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/netfilter_ipv6.h> |
| #include <linux/slab.h> |
| #include <linux/hash.h> |
| #include <linux/etherdevice.h> |
| |
| #include <linux/uaccess.h> |
| #include <linux/atomic.h> |
| |
| #include <net/icmp.h> |
| #include <net/ip.h> |
| #include <net/ip_tunnels.h> |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <net/addrconf.h> |
| #include <net/ip6_tunnel.h> |
| #include <net/xfrm.h> |
| #include <net/dsfield.h> |
| #include <net/inet_ecn.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| #include <net/dst_metadata.h> |
| |
| MODULE_AUTHOR("Ville Nuorvala"); |
| MODULE_DESCRIPTION("IPv6 tunneling device"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_RTNL_LINK("ip6tnl"); |
| MODULE_ALIAS_NETDEV("ip6tnl0"); |
| |
| #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 |
| #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) |
| |
| static bool log_ecn_error = true; |
| module_param(log_ecn_error, bool, 0644); |
| MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| |
| static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
| { |
| u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); |
| |
| return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); |
| } |
| |
| static int ip6_tnl_dev_init(struct net_device *dev); |
| static void ip6_tnl_dev_setup(struct net_device *dev); |
| static struct rtnl_link_ops ip6_link_ops __read_mostly; |
| |
| static unsigned int ip6_tnl_net_id __read_mostly; |
| struct ip6_tnl_net { |
| /* the IPv6 tunnel fallback device */ |
| struct net_device *fb_tnl_dev; |
| /* lists for storing tunnels in use */ |
| struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; |
| struct ip6_tnl __rcu *tnls_wc[1]; |
| struct ip6_tnl __rcu **tnls[2]; |
| struct ip6_tnl __rcu *collect_md_tun; |
| }; |
| |
| static inline int ip6_tnl_mpls_supported(void) |
| { |
| return IS_ENABLED(CONFIG_MPLS); |
| } |
| |
| static struct net_device_stats *ip6_get_stats(struct net_device *dev) |
| { |
| struct pcpu_sw_netstats tmp, sum = { 0 }; |
| int i; |
| |
| for_each_possible_cpu(i) { |
| unsigned int start; |
| const struct pcpu_sw_netstats *tstats = |
| per_cpu_ptr(dev->tstats, i); |
| |
| do { |
| start = u64_stats_fetch_begin_irq(&tstats->syncp); |
| tmp.rx_packets = tstats->rx_packets; |
| tmp.rx_bytes = tstats->rx_bytes; |
| tmp.tx_packets = tstats->tx_packets; |
| tmp.tx_bytes = tstats->tx_bytes; |
| } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
| |
| sum.rx_packets += tmp.rx_packets; |
| sum.rx_bytes += tmp.rx_bytes; |
| sum.tx_packets += tmp.tx_packets; |
| sum.tx_bytes += tmp.tx_bytes; |
| } |
| dev->stats.rx_packets = sum.rx_packets; |
| dev->stats.rx_bytes = sum.rx_bytes; |
| dev->stats.tx_packets = sum.tx_packets; |
| dev->stats.tx_bytes = sum.tx_bytes; |
| return &dev->stats; |
| } |
| |
| /** |
| * ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
| * @link: ifindex of underlying interface |
| * @remote: the address of the tunnel exit-point |
| * @local: the address of the tunnel entry-point |
| * |
| * Return: |
| * tunnel matching given end-points if found, |
| * else fallback tunnel if its device is up, |
| * else %NULL |
| **/ |
| |
| #define for_each_ip6_tunnel_rcu(start) \ |
| for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) |
| |
| static struct ip6_tnl * |
| ip6_tnl_lookup(struct net *net, int link, |
| const struct in6_addr *remote, const struct in6_addr *local) |
| { |
| unsigned int hash = HASH(remote, local); |
| struct ip6_tnl *t, *cand = NULL; |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| struct in6_addr any; |
| |
| for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| if (!ipv6_addr_equal(local, &t->parms.laddr) || |
| !ipv6_addr_equal(remote, &t->parms.raddr) || |
| !(t->dev->flags & IFF_UP)) |
| continue; |
| |
| if (link == t->parms.link) |
| return t; |
| else |
| cand = t; |
| } |
| |
| memset(&any, 0, sizeof(any)); |
| hash = HASH(&any, local); |
| for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| if (!ipv6_addr_equal(local, &t->parms.laddr) || |
| !ipv6_addr_any(&t->parms.raddr) || |
| !(t->dev->flags & IFF_UP)) |
| continue; |
| |
| if (link == t->parms.link) |
| return t; |
| else if (!cand) |
| cand = t; |
| } |
| |
| hash = HASH(remote, &any); |
| for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
| !ipv6_addr_any(&t->parms.laddr) || |
| !(t->dev->flags & IFF_UP)) |
| continue; |
| |
| if (link == t->parms.link) |
| return t; |
| else if (!cand) |
| cand = t; |
| } |
| |
| if (cand) |
| return cand; |
| |
| t = rcu_dereference(ip6n->collect_md_tun); |
| if (t && t->dev->flags & IFF_UP) |
| return t; |
| |
| t = rcu_dereference(ip6n->tnls_wc[0]); |
| if (t && (t->dev->flags & IFF_UP)) |
| return t; |
| |
| return NULL; |
| } |
| |
| /** |
| * ip6_tnl_bucket - get head of list matching given tunnel parameters |
| * @p: parameters containing tunnel end-points |
| * |
| * Description: |
| * ip6_tnl_bucket() returns the head of the list matching the |
| * &struct in6_addr entries laddr and raddr in @p. |
| * |
| * Return: head of IPv6 tunnel list |
| **/ |
| |
| static struct ip6_tnl __rcu ** |
| ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
| { |
| const struct in6_addr *remote = &p->raddr; |
| const struct in6_addr *local = &p->laddr; |
| unsigned int h = 0; |
| int prio = 0; |
| |
| if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { |
| prio = 1; |
| h = HASH(remote, local); |
| } |
| return &ip6n->tnls[prio][h]; |
| } |
| |
| /** |
| * ip6_tnl_link - add tunnel to hash table |
| * @t: tunnel to be added |
| **/ |
| |
| static void |
| ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
| { |
| struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); |
| |
| if (t->parms.collect_md) |
| rcu_assign_pointer(ip6n->collect_md_tun, t); |
| rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
| rcu_assign_pointer(*tp, t); |
| } |
| |
| /** |
| * ip6_tnl_unlink - remove tunnel from hash table |
| * @t: tunnel to be removed |
| **/ |
| |
| static void |
| ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) |
| { |
| struct ip6_tnl __rcu **tp; |
| struct ip6_tnl *iter; |
| |
| if (t->parms.collect_md) |
| rcu_assign_pointer(ip6n->collect_md_tun, NULL); |
| |
| for (tp = ip6_tnl_bucket(ip6n, &t->parms); |
| (iter = rtnl_dereference(*tp)) != NULL; |
| tp = &iter->next) { |
| if (t == iter) { |
| rcu_assign_pointer(*tp, t->next); |
| break; |
| } |
| } |
| } |
| |
| static void ip6_dev_free(struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| |
| gro_cells_destroy(&t->gro_cells); |
| dst_cache_destroy(&t->dst_cache); |
| free_percpu(dev->tstats); |
| } |
| |
| static int ip6_tnl_create2(struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct net *net = dev_net(dev); |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| int err; |
| |
| t = netdev_priv(dev); |
| |
| dev->rtnl_link_ops = &ip6_link_ops; |
| err = register_netdevice(dev); |
| if (err < 0) |
| goto out; |
| |
| strcpy(t->parms.name, dev->name); |
| |
| dev_hold(dev); |
| ip6_tnl_link(ip6n, t); |
| return 0; |
| |
| out: |
| return err; |
| } |
| |
| /** |
| * ip6_tnl_create - create a new tunnel |
| * @p: tunnel parameters |
| * @pt: pointer to new tunnel |
| * |
| * Description: |
| * Create tunnel matching given parameters. |
| * |
| * Return: |
| * created tunnel or error pointer |
| **/ |
| |
| static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
| { |
| struct net_device *dev; |
| struct ip6_tnl *t; |
| char name[IFNAMSIZ]; |
| int err = -E2BIG; |
| |
| if (p->name[0]) { |
| if (!dev_valid_name(p->name)) |
| goto failed; |
| strlcpy(name, p->name, IFNAMSIZ); |
| } else { |
| sprintf(name, "ip6tnl%%d"); |
| } |
| err = -ENOMEM; |
| dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
| ip6_tnl_dev_setup); |
| if (!dev) |
| goto failed; |
| |
| dev_net_set(dev, net); |
| |
| t = netdev_priv(dev); |
| t->parms = *p; |
| t->net = dev_net(dev); |
| err = ip6_tnl_create2(dev); |
| if (err < 0) |
| goto failed_free; |
| |
| return t; |
| |
| failed_free: |
| free_netdev(dev); |
| failed: |
| return ERR_PTR(err); |
| } |
| |
| /** |
| * ip6_tnl_locate - find or create tunnel matching given parameters |
| * @p: tunnel parameters |
| * @create: != 0 if allowed to create new tunnel if no match found |
| * |
| * Description: |
| * ip6_tnl_locate() first tries to locate an existing tunnel |
| * based on @parms. If this is unsuccessful, but @create is set a new |
| * tunnel device is created and registered for use. |
| * |
| * Return: |
| * matching tunnel or error pointer |
| **/ |
| |
| static struct ip6_tnl *ip6_tnl_locate(struct net *net, |
| struct __ip6_tnl_parm *p, int create) |
| { |
| const struct in6_addr *remote = &p->raddr; |
| const struct in6_addr *local = &p->laddr; |
| struct ip6_tnl __rcu **tp; |
| struct ip6_tnl *t; |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| |
| for (tp = ip6_tnl_bucket(ip6n, p); |
| (t = rtnl_dereference(*tp)) != NULL; |
| tp = &t->next) { |
| if (ipv6_addr_equal(local, &t->parms.laddr) && |
| ipv6_addr_equal(remote, &t->parms.raddr) && |
| p->link == t->parms.link) { |
| if (create) |
| return ERR_PTR(-EEXIST); |
| |
| return t; |
| } |
| } |
| if (!create) |
| return ERR_PTR(-ENODEV); |
| return ip6_tnl_create(net, p); |
| } |
| |
| /** |
| * ip6_tnl_dev_uninit - tunnel device uninitializer |
| * @dev: the device to be destroyed |
| * |
| * Description: |
| * ip6_tnl_dev_uninit() removes tunnel from its list |
| **/ |
| |
| static void |
| ip6_tnl_dev_uninit(struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct net *net = t->net; |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| |
| if (dev == ip6n->fb_tnl_dev) |
| RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
| else |
| ip6_tnl_unlink(ip6n, t); |
| dst_cache_reset(&t->dst_cache); |
| dev_put(dev); |
| } |
| |
| /** |
| * parse_tvl_tnl_enc_lim - handle encapsulation limit option |
| * @skb: received socket buffer |
| * |
| * Return: |
| * 0 if none was found, |
| * else index to encapsulation limit |
| **/ |
| |
| __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
| { |
| const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; |
| unsigned int nhoff = raw - skb->data; |
| unsigned int off = nhoff + sizeof(*ipv6h); |
| u8 next, nexthdr = ipv6h->nexthdr; |
| |
| while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { |
| struct ipv6_opt_hdr *hdr; |
| u16 optlen; |
| |
| if (!pskb_may_pull(skb, off + sizeof(*hdr))) |
| break; |
| |
| hdr = (struct ipv6_opt_hdr *)(skb->data + off); |
| if (nexthdr == NEXTHDR_FRAGMENT) { |
| struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; |
| if (frag_hdr->frag_off) |
| break; |
| optlen = 8; |
| } else if (nexthdr == NEXTHDR_AUTH) { |
| optlen = ipv6_authlen(hdr); |
| } else { |
| optlen = ipv6_optlen(hdr); |
| } |
| /* cache hdr->nexthdr, since pskb_may_pull() might |
| * invalidate hdr |
| */ |
| next = hdr->nexthdr; |
| if (nexthdr == NEXTHDR_DEST) { |
| u16 i = 2; |
| |
| /* Remember : hdr is no longer valid at this point. */ |
| if (!pskb_may_pull(skb, off + optlen)) |
| break; |
| |
| while (1) { |
| struct ipv6_tlv_tnl_enc_lim *tel; |
| |
| /* No more room for encapsulation limit */ |
| if (i + sizeof(*tel) > optlen) |
| break; |
| |
| tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); |
| /* return index of option if found and valid */ |
| if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && |
| tel->length == 1) |
| return i + off - nhoff; |
| /* else jump to next option */ |
| if (tel->type) |
| i += tel->length + 2; |
| else |
| i++; |
| } |
| } |
| nexthdr = next; |
| off += optlen; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); |
| |
| /** |
| * ip6_tnl_err - tunnel error handler |
| * |
| * Description: |
| * ip6_tnl_err() should handle errors in the tunnel according |
| * to the specifications in RFC 2473. |
| **/ |
| |
| static int |
| ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, |
| u8 *type, u8 *code, int *msg, __u32 *info, int offset) |
| { |
| const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; |
| struct net *net = dev_net(skb->dev); |
| u8 rel_type = ICMPV6_DEST_UNREACH; |
| u8 rel_code = ICMPV6_ADDR_UNREACH; |
| __u32 rel_info = 0; |
| struct ip6_tnl *t; |
| int err = -ENOENT; |
| int rel_msg = 0; |
| u8 tproto; |
| __u16 len; |
| |
| /* If the packet doesn't contain the original IPv6 header we are |
| in trouble since we might need the source address for further |
| processing of the error. */ |
| |
| rcu_read_lock(); |
| t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr); |
| if (!t) |
| goto out; |
| |
| tproto = READ_ONCE(t->parms.proto); |
| if (tproto != ipproto && tproto != 0) |
| goto out; |
| |
| err = 0; |
| |
| switch (*type) { |
| case ICMPV6_DEST_UNREACH: |
| net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
| t->parms.name); |
| rel_msg = 1; |
| break; |
| case ICMPV6_TIME_EXCEED: |
| if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
| net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
| t->parms.name); |
| rel_msg = 1; |
| } |
| break; |
| case ICMPV6_PARAMPROB: { |
| struct ipv6_tlv_tnl_enc_lim *tel; |
| __u32 teli; |
| |
| teli = 0; |
| if ((*code) == ICMPV6_HDR_FIELD) |
| teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
| |
| if (teli && teli == *info - 2) { |
| tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
| if (tel->encap_limit == 0) { |
| net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
| t->parms.name); |
| rel_msg = 1; |
| } |
| } else { |
| net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
| t->parms.name); |
| } |
| break; |
| } |
| case ICMPV6_PKT_TOOBIG: { |
| __u32 mtu; |
| |
| ip6_update_pmtu(skb, net, htonl(*info), 0, 0, |
| sock_net_uid(net, NULL)); |
| mtu = *info - offset; |
| if (mtu < IPV6_MIN_MTU) |
| mtu = IPV6_MIN_MTU; |
| len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); |
| if (len > mtu) { |
| rel_type = ICMPV6_PKT_TOOBIG; |
| rel_code = 0; |
| rel_info = mtu; |
| rel_msg = 1; |
| } |
| break; |
| } |
| case NDISC_REDIRECT: |
| ip6_redirect(skb, net, skb->dev->ifindex, 0, |
| sock_net_uid(net, NULL)); |
| break; |
| } |
| |
| *type = rel_type; |
| *code = rel_code; |
| *info = rel_info; |
| *msg = rel_msg; |
| |
| out: |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| static int |
| ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info) |
| { |
| __u32 rel_info = ntohl(info); |
| const struct iphdr *eiph; |
| struct sk_buff *skb2; |
| int err, rel_msg = 0; |
| u8 rel_type = type; |
| u8 rel_code = code; |
| struct rtable *rt; |
| struct flowi4 fl4; |
| |
| err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, |
| &rel_msg, &rel_info, offset); |
| if (err < 0) |
| return err; |
| |
| if (rel_msg == 0) |
| return 0; |
| |
| switch (rel_type) { |
| case ICMPV6_DEST_UNREACH: |
| if (rel_code != ICMPV6_ADDR_UNREACH) |
| return 0; |
| rel_type = ICMP_DEST_UNREACH; |
| rel_code = ICMP_HOST_UNREACH; |
| break; |
| case ICMPV6_PKT_TOOBIG: |
| if (rel_code != 0) |
| return 0; |
| rel_type = ICMP_DEST_UNREACH; |
| rel_code = ICMP_FRAG_NEEDED; |
| break; |
| default: |
| return 0; |
| } |
| |
| if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) |
| return 0; |
| |
| skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (!skb2) |
| return 0; |
| |
| skb_dst_drop(skb2); |
| |
| skb_pull(skb2, offset); |
| skb_reset_network_header(skb2); |
| eiph = ip_hdr(skb2); |
| |
| /* Try to guess incoming interface */ |
| rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, |
| 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); |
| if (IS_ERR(rt)) |
| goto out; |
| |
| skb2->dev = rt->dst.dev; |
| ip_rt_put(rt); |
| |
| /* route "incoming" packet */ |
| if (rt->rt_flags & RTCF_LOCAL) { |
| rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, |
| eiph->daddr, eiph->saddr, 0, 0, |
| IPPROTO_IPIP, RT_TOS(eiph->tos), 0); |
| if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) { |
| if (!IS_ERR(rt)) |
| ip_rt_put(rt); |
| goto out; |
| } |
| skb_dst_set(skb2, &rt->dst); |
| } else { |
| if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, |
| skb2->dev) || |
| skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6) |
| goto out; |
| } |
| |
| /* change mtu on this route */ |
| if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { |
| if (rel_info > dst_mtu(skb_dst(skb2))) |
| goto out; |
| |
| skb_dst_update_pmtu_no_confirm(skb2, rel_info); |
| } |
| |
| icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); |
| |
| out: |
| kfree_skb(skb2); |
| return 0; |
| } |
| |
| static int |
| ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info) |
| { |
| __u32 rel_info = ntohl(info); |
| int err, rel_msg = 0; |
| u8 rel_type = type; |
| u8 rel_code = code; |
| |
| err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, |
| &rel_msg, &rel_info, offset); |
| if (err < 0) |
| return err; |
| |
| if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { |
| struct rt6_info *rt; |
| struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| |
| if (!skb2) |
| return 0; |
| |
| skb_dst_drop(skb2); |
| skb_pull(skb2, offset); |
| skb_reset_network_header(skb2); |
| |
| /* Try to guess incoming interface */ |
| rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, |
| NULL, 0, skb2, 0); |
| |
| if (rt && rt->dst.dev) |
| skb2->dev = rt->dst.dev; |
| |
| icmpv6_send(skb2, rel_type, rel_code, rel_info); |
| |
| ip6_rt_put(rt); |
| |
| kfree_skb(skb2); |
| } |
| |
| return 0; |
| } |
| |
| static int |
| mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info) |
| { |
| __u32 rel_info = ntohl(info); |
| int err, rel_msg = 0; |
| u8 rel_type = type; |
| u8 rel_code = code; |
| |
| err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code, |
| &rel_msg, &rel_info, offset); |
| return err; |
| } |
| |
| static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
| const struct ipv6hdr *ipv6h, |
| struct sk_buff *skb) |
| { |
| __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; |
| |
| if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
| ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); |
| |
| return IP6_ECN_decapsulate(ipv6h, skb); |
| } |
| |
| static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
| const struct ipv6hdr *ipv6h, |
| struct sk_buff *skb) |
| { |
| if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
| ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); |
| |
| return IP6_ECN_decapsulate(ipv6h, skb); |
| } |
| |
| static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
| const struct ipv6hdr *ipv6h, |
| struct sk_buff *skb) |
| { |
| /* ECN is not supported in AF_MPLS */ |
| return 0; |
| } |
| |
| __u32 ip6_tnl_get_cap(struct ip6_tnl *t, |
| const struct in6_addr *laddr, |
| const struct in6_addr *raddr) |
| { |
| struct __ip6_tnl_parm *p = &t->parms; |
| int ltype = ipv6_addr_type(laddr); |
| int rtype = ipv6_addr_type(raddr); |
| __u32 flags = 0; |
| |
| if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { |
| flags = IP6_TNL_F_CAP_PER_PACKET; |
| } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
| rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
| !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && |
| (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
| if (ltype&IPV6_ADDR_UNICAST) |
| flags |= IP6_TNL_F_CAP_XMIT; |
| if (rtype&IPV6_ADDR_UNICAST) |
| flags |= IP6_TNL_F_CAP_RCV; |
| } |
| return flags; |
| } |
| EXPORT_SYMBOL(ip6_tnl_get_cap); |
| |
| /* called with rcu_read_lock() */ |
| int ip6_tnl_rcv_ctl(struct ip6_tnl *t, |
| const struct in6_addr *laddr, |
| const struct in6_addr *raddr) |
| { |
| struct __ip6_tnl_parm *p = &t->parms; |
| int ret = 0; |
| struct net *net = t->net; |
| |
| if ((p->flags & IP6_TNL_F_CAP_RCV) || |
| ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && |
| (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { |
| struct net_device *ldev = NULL; |
| |
| if (p->link) |
| ldev = dev_get_by_index_rcu(net, p->link); |
| |
| if ((ipv6_addr_is_multicast(laddr) || |
| likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false, |
| 0, IFA_F_TENTATIVE))) && |
| ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || |
| likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true, |
| 0, IFA_F_TENTATIVE)))) |
| ret = 1; |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); |
| |
| static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, |
| const struct tnl_ptk_info *tpi, |
| struct metadata_dst *tun_dst, |
| int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
| const struct ipv6hdr *ipv6h, |
| struct sk_buff *skb), |
| bool log_ecn_err) |
| { |
| struct pcpu_sw_netstats *tstats; |
| const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| int err; |
| |
| if ((!(tpi->flags & TUNNEL_CSUM) && |
| (tunnel->parms.i_flags & TUNNEL_CSUM)) || |
| ((tpi->flags & TUNNEL_CSUM) && |
| !(tunnel->parms.i_flags & TUNNEL_CSUM))) { |
| tunnel->dev->stats.rx_crc_errors++; |
| tunnel->dev->stats.rx_errors++; |
| goto drop; |
| } |
| |
| if (tunnel->parms.i_flags & TUNNEL_SEQ) { |
| if (!(tpi->flags & TUNNEL_SEQ) || |
| (tunnel->i_seqno && |
| (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { |
| tunnel->dev->stats.rx_fifo_errors++; |
| tunnel->dev->stats.rx_errors++; |
| goto drop; |
| } |
| tunnel->i_seqno = ntohl(tpi->seq) + 1; |
| } |
| |
| skb->protocol = tpi->proto; |
| |
| /* Warning: All skb pointers will be invalidated! */ |
| if (tunnel->dev->type == ARPHRD_ETHER) { |
| if (!pskb_may_pull(skb, ETH_HLEN)) { |
| tunnel->dev->stats.rx_length_errors++; |
| tunnel->dev->stats.rx_errors++; |
| goto drop; |
| } |
| |
| ipv6h = ipv6_hdr(skb); |
| skb->protocol = eth_type_trans(skb, tunnel->dev); |
| skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| } else { |
| skb->dev = tunnel->dev; |
| } |
| |
| skb_reset_network_header(skb); |
| memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
| |
| __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); |
| |
| err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); |
| if (unlikely(err)) { |
| if (log_ecn_err) |
| net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", |
| &ipv6h->saddr, |
| ipv6_get_dsfield(ipv6h)); |
| if (err > 1) { |
| ++tunnel->dev->stats.rx_frame_errors; |
| ++tunnel->dev->stats.rx_errors; |
| goto drop; |
| } |
| } |
| |
| tstats = this_cpu_ptr(tunnel->dev->tstats); |
| u64_stats_update_begin(&tstats->syncp); |
| tstats->rx_packets++; |
| tstats->rx_bytes += skb->len; |
| u64_stats_update_end(&tstats->syncp); |
| |
| skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
| |
| if (tun_dst) |
| skb_dst_set(skb, (struct dst_entry *)tun_dst); |
| |
| gro_cells_receive(&tunnel->gro_cells, skb); |
| return 0; |
| |
| drop: |
| if (tun_dst) |
| dst_release((struct dst_entry *)tun_dst); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, |
| const struct tnl_ptk_info *tpi, |
| struct metadata_dst *tun_dst, |
| bool log_ecn_err) |
| { |
| return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate, |
| log_ecn_err); |
| } |
| EXPORT_SYMBOL(ip6_tnl_rcv); |
| |
| static const struct tnl_ptk_info tpi_v6 = { |
| /* no tunnel info required for ipxip6. */ |
| .proto = htons(ETH_P_IPV6), |
| }; |
| |
| static const struct tnl_ptk_info tpi_v4 = { |
| /* no tunnel info required for ipxip6. */ |
| .proto = htons(ETH_P_IP), |
| }; |
| |
| static const struct tnl_ptk_info tpi_mpls = { |
| /* no tunnel info required for mplsip6. */ |
| .proto = htons(ETH_P_MPLS_UC), |
| }; |
| |
| static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, |
| const struct tnl_ptk_info *tpi, |
| int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
| const struct ipv6hdr *ipv6h, |
| struct sk_buff *skb)) |
| { |
| struct ip6_tnl *t; |
| const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| struct metadata_dst *tun_dst = NULL; |
| int ret = -1; |
| |
| rcu_read_lock(); |
| t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr); |
| |
| if (t) { |
| u8 tproto = READ_ONCE(t->parms.proto); |
| |
| if (tproto != ipproto && tproto != 0) |
| goto drop; |
| if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| goto drop; |
| ipv6h = ipv6_hdr(skb); |
| if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) |
| goto drop; |
| if (iptunnel_pull_header(skb, 0, tpi->proto, false)) |
| goto drop; |
| if (t->parms.collect_md) { |
| tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); |
| if (!tun_dst) |
| goto drop; |
| } |
| ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, |
| log_ecn_error); |
| } |
| |
| rcu_read_unlock(); |
| |
| return ret; |
| |
| drop: |
| rcu_read_unlock(); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int ip4ip6_rcv(struct sk_buff *skb) |
| { |
| return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, |
| ip4ip6_dscp_ecn_decapsulate); |
| } |
| |
| static int ip6ip6_rcv(struct sk_buff *skb) |
| { |
| return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, |
| ip6ip6_dscp_ecn_decapsulate); |
| } |
| |
| static int mplsip6_rcv(struct sk_buff *skb) |
| { |
| return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls, |
| mplsip6_dscp_ecn_decapsulate); |
| } |
| |
| struct ipv6_tel_txoption { |
| struct ipv6_txoptions ops; |
| __u8 dst_opt[8]; |
| }; |
| |
| static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
| { |
| memset(opt, 0, sizeof(struct ipv6_tel_txoption)); |
| |
| opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
| opt->dst_opt[3] = 1; |
| opt->dst_opt[4] = encap_limit; |
| opt->dst_opt[5] = IPV6_TLV_PADN; |
| opt->dst_opt[6] = 1; |
| |
| opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
| opt->ops.opt_nflen = 8; |
| } |
| |
| /** |
| * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own |
| * @t: the outgoing tunnel device |
| * @hdr: IPv6 header from the incoming packet |
| * |
| * Description: |
| * Avoid trivial tunneling loop by checking that tunnel exit-point |
| * doesn't match source of incoming packet. |
| * |
| * Return: |
| * 1 if conflict, |
| * 0 else |
| **/ |
| |
| static inline bool |
| ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
| { |
| return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); |
| } |
| |
| int ip6_tnl_xmit_ctl(struct ip6_tnl *t, |
| const struct in6_addr *laddr, |
| const struct in6_addr *raddr) |
| { |
| struct __ip6_tnl_parm *p = &t->parms; |
| int ret = 0; |
| struct net *net = t->net; |
| |
| if (t->parms.collect_md) |
| return 1; |
| |
| if ((p->flags & IP6_TNL_F_CAP_XMIT) || |
| ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && |
| (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { |
| struct net_device *ldev = NULL; |
| |
| rcu_read_lock(); |
| if (p->link) |
| ldev = dev_get_by_index_rcu(net, p->link); |
| |
| if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false, |
| 0, IFA_F_TENTATIVE))) |
| pr_warn("%s xmit: Local address not yet configured!\n", |
| p->name); |
| else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && |
| !ipv6_addr_is_multicast(raddr) && |
| unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev, |
| true, 0, IFA_F_TENTATIVE))) |
| pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", |
| p->name); |
| else |
| ret = 1; |
| rcu_read_unlock(); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); |
| |
| /** |
| * ip6_tnl_xmit - encapsulate packet and send |
| * @skb: the outgoing socket buffer |
| * @dev: the outgoing tunnel device |
| * @dsfield: dscp code for outer header |
| * @fl6: flow of tunneled packet |
| * @encap_limit: encapsulation limit |
| * @pmtu: Path MTU is stored if packet is too big |
| * @proto: next header value |
| * |
| * Description: |
| * Build new header and do some sanity checks on the packet before sending |
| * it. |
| * |
| * Return: |
| * 0 on success |
| * -1 fail |
| * %-EMSGSIZE message too big. return mtu in this case. |
| **/ |
| |
| int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, |
| struct flowi6 *fl6, int encap_limit, __u32 *pmtu, |
| __u8 proto) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct net *net = t->net; |
| struct net_device_stats *stats = &t->dev->stats; |
| struct ipv6hdr *ipv6h; |
| struct ipv6_tel_txoption opt; |
| struct dst_entry *dst = NULL, *ndst = NULL; |
| struct net_device *tdev; |
| int mtu; |
| unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; |
| unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; |
| unsigned int max_headroom = psh_hlen; |
| bool use_cache = false; |
| u8 hop_limit; |
| int err = -1; |
| |
| if (t->parms.collect_md) { |
| hop_limit = skb_tunnel_info(skb)->key.ttl; |
| goto route_lookup; |
| } else { |
| hop_limit = t->parms.hop_limit; |
| } |
| |
| /* NBMA tunnel */ |
| if (ipv6_addr_any(&t->parms.raddr)) { |
| if (skb->protocol == htons(ETH_P_IPV6)) { |
| struct in6_addr *addr6; |
| struct neighbour *neigh; |
| int addr_type; |
| |
| if (!skb_dst(skb)) |
| goto tx_err_link_failure; |
| |
| neigh = dst_neigh_lookup(skb_dst(skb), |
| &ipv6_hdr(skb)->daddr); |
| if (!neigh) |
| goto tx_err_link_failure; |
| |
| addr6 = (struct in6_addr *)&neigh->primary_key; |
| addr_type = ipv6_addr_type(addr6); |
| |
| if (addr_type == IPV6_ADDR_ANY) |
| addr6 = &ipv6_hdr(skb)->daddr; |
| |
| memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); |
| neigh_release(neigh); |
| } |
| } else if (t->parms.proto != 0 && !(t->parms.flags & |
| (IP6_TNL_F_USE_ORIG_TCLASS | |
| IP6_TNL_F_USE_ORIG_FWMARK))) { |
| /* enable the cache only if neither the outer protocol nor the |
| * routing decision depends on the current inner header value |
| */ |
| use_cache = true; |
| } |
| |
| if (use_cache) |
| dst = dst_cache_get(&t->dst_cache); |
| |
| if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) |
| goto tx_err_link_failure; |
| |
| if (!dst) { |
| route_lookup: |
| /* add dsfield to flowlabel for route lookup */ |
| fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); |
| |
| dst = ip6_route_output(net, NULL, fl6); |
| |
| if (dst->error) |
| goto tx_err_link_failure; |
| dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| dst = NULL; |
| goto tx_err_link_failure; |
| } |
| if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) && |
| ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, |
| &fl6->daddr, 0, &fl6->saddr)) |
| goto tx_err_link_failure; |
| ndst = dst; |
| } |
| |
| tdev = dst->dev; |
| |
| if (tdev == dev) { |
| stats->collisions++; |
| net_warn_ratelimited("%s: Local routing loop detected!\n", |
| t->parms.name); |
| goto tx_err_dst_release; |
| } |
| mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; |
| if (encap_limit >= 0) { |
| max_headroom += 8; |
| mtu -= 8; |
| } |
| mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ? |
| IPV6_MIN_MTU : IPV4_MIN_MTU); |
| |
| skb_dst_update_pmtu_no_confirm(skb, mtu); |
| if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { |
| *pmtu = mtu; |
| err = -EMSGSIZE; |
| goto tx_err_dst_release; |
| } |
| |
| if (t->err_count > 0) { |
| if (time_before(jiffies, |
| t->err_time + IP6TUNNEL_ERR_TIMEO)) { |
| t->err_count--; |
| |
| dst_link_failure(skb); |
| } else { |
| t->err_count = 0; |
| } |
| } |
| |
| skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
| |
| /* |
| * Okay, now see if we can stuff it in the buffer as-is. |
| */ |
| max_headroom += LL_RESERVED_SPACE(tdev); |
| |
| if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
| (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { |
| struct sk_buff *new_skb; |
| |
| new_skb = skb_realloc_headroom(skb, max_headroom); |
| if (!new_skb) |
| goto tx_err_dst_release; |
| |
| if (skb->sk) |
| skb_set_owner_w(new_skb, skb->sk); |
| consume_skb(skb); |
| skb = new_skb; |
| } |
| |
| if (t->parms.collect_md) { |
| if (t->encap.type != TUNNEL_ENCAP_NONE) |
| goto tx_err_dst_release; |
| } else { |
| if (use_cache && ndst) |
| dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); |
| } |
| skb_dst_set(skb, dst); |
| |
| if (hop_limit == 0) { |
| if (skb->protocol == htons(ETH_P_IP)) |
| hop_limit = ip_hdr(skb)->ttl; |
| else if (skb->protocol == htons(ETH_P_IPV6)) |
| hop_limit = ipv6_hdr(skb)->hop_limit; |
| else |
| hop_limit = ip6_dst_hoplimit(dst); |
| } |
| |
| /* Calculate max headroom for all the headers and adjust |
| * needed_headroom if necessary. |
| */ |
| max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) |
| + dst->header_len + t->hlen; |
| if (max_headroom > dev->needed_headroom) |
| dev->needed_headroom = max_headroom; |
| |
| err = ip6_tnl_encap(skb, t, &proto, fl6); |
| if (err) |
| return err; |
| |
| if (encap_limit >= 0) { |
| init_tel_txopt(&opt, encap_limit); |
| ipv6_push_frag_opts(skb, &opt.ops, &proto); |
| } |
| |
| skb_set_inner_ipproto(skb, proto); |
| |
| skb_push(skb, sizeof(struct ipv6hdr)); |
| skb_reset_network_header(skb); |
| ipv6h = ipv6_hdr(skb); |
| ip6_flow_hdr(ipv6h, dsfield, |
| ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); |
| ipv6h->hop_limit = hop_limit; |
| ipv6h->nexthdr = proto; |
| ipv6h->saddr = fl6->saddr; |
| ipv6h->daddr = fl6->daddr; |
| ip6tunnel_xmit(NULL, skb, dev); |
| return 0; |
| tx_err_link_failure: |
| stats->tx_carrier_errors++; |
| dst_link_failure(skb); |
| tx_err_dst_release: |
| dst_release(dst); |
| return err; |
| } |
| EXPORT_SYMBOL(ip6_tnl_xmit); |
| |
| static inline int |
| ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, |
| u8 protocol) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct ipv6hdr *ipv6h; |
| const struct iphdr *iph; |
| int encap_limit = -1; |
| __u16 offset; |
| struct flowi6 fl6; |
| __u8 dsfield, orig_dsfield; |
| __u32 mtu; |
| u8 tproto; |
| int err; |
| |
| tproto = READ_ONCE(t->parms.proto); |
| if (tproto != protocol && tproto != 0) |
| return -1; |
| |
| if (t->parms.collect_md) { |
| struct ip_tunnel_info *tun_info; |
| const struct ip_tunnel_key *key; |
| |
| tun_info = skb_tunnel_info(skb); |
| if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
| ip_tunnel_info_af(tun_info) != AF_INET6)) |
| return -1; |
| key = &tun_info->key; |
| memset(&fl6, 0, sizeof(fl6)); |
| fl6.flowi6_proto = protocol; |
| fl6.saddr = key->u.ipv6.src; |
| fl6.daddr = key->u.ipv6.dst; |
| fl6.flowlabel = key->label; |
| dsfield = key->tos; |
| switch (protocol) { |
| case IPPROTO_IPIP: |
| iph = ip_hdr(skb); |
| orig_dsfield = ipv4_get_dsfield(iph); |
| break; |
| case IPPROTO_IPV6: |
| ipv6h = ipv6_hdr(skb); |
| orig_dsfield = ipv6_get_dsfield(ipv6h); |
| break; |
| default: |
| orig_dsfield = dsfield; |
| break; |
| } |
| } else { |
| if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| encap_limit = t->parms.encap_limit; |
| if (protocol == IPPROTO_IPV6) { |
| offset = ip6_tnl_parse_tlv_enc_lim(skb, |
| skb_network_header(skb)); |
| /* ip6_tnl_parse_tlv_enc_lim() might have |
| * reallocated skb->head |
| */ |
| if (offset > 0) { |
| struct ipv6_tlv_tnl_enc_lim *tel; |
| |
| tel = (void *)&skb_network_header(skb)[offset]; |
| if (tel->encap_limit == 0) { |
| icmpv6_send(skb, ICMPV6_PARAMPROB, |
| ICMPV6_HDR_FIELD, offset + 2); |
| return -1; |
| } |
| encap_limit = tel->encap_limit - 1; |
| } |
| } |
| |
| memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
| fl6.flowi6_proto = protocol; |
| |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
| fl6.flowi6_mark = skb->mark; |
| else |
| fl6.flowi6_mark = t->parms.fwmark; |
| switch (protocol) { |
| case IPPROTO_IPIP: |
| iph = ip_hdr(skb); |
| orig_dsfield = ipv4_get_dsfield(iph); |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
| dsfield = orig_dsfield; |
| else |
| dsfield = ip6_tclass(t->parms.flowinfo); |
| break; |
| case IPPROTO_IPV6: |
| ipv6h = ipv6_hdr(skb); |
| orig_dsfield = ipv6_get_dsfield(ipv6h); |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
| dsfield = orig_dsfield; |
| else |
| dsfield = ip6_tclass(t->parms.flowinfo); |
| if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
| fl6.flowlabel |= ip6_flowlabel(ipv6h); |
| break; |
| default: |
| orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo); |
| break; |
| } |
| } |
| |
| fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
| dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield); |
| |
| if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) |
| return -1; |
| |
| err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
| protocol); |
| if (err != 0) { |
| /* XXX: send ICMP error even if DF is not set. */ |
| if (err == -EMSGSIZE) |
| switch (protocol) { |
| case IPPROTO_IPIP: |
| icmp_send(skb, ICMP_DEST_UNREACH, |
| ICMP_FRAG_NEEDED, htonl(mtu)); |
| break; |
| case IPPROTO_IPV6: |
| icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| break; |
| default: |
| break; |
| } |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static netdev_tx_t |
| ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct net_device_stats *stats = &t->dev->stats; |
| u8 ipproto; |
| int ret; |
| |
| if (!pskb_inet_may_pull(skb)) |
| goto tx_err; |
| |
| switch (skb->protocol) { |
| case htons(ETH_P_IP): |
| ipproto = IPPROTO_IPIP; |
| break; |
| case htons(ETH_P_IPV6): |
| if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb))) |
| goto tx_err; |
| ipproto = IPPROTO_IPV6; |
| break; |
| case htons(ETH_P_MPLS_UC): |
| ipproto = IPPROTO_MPLS; |
| break; |
| default: |
| goto tx_err; |
| } |
| |
| ret = ipxip6_tnl_xmit(skb, dev, ipproto); |
| if (ret < 0) |
| goto tx_err; |
| |
| return NETDEV_TX_OK; |
| |
| tx_err: |
| stats->tx_errors++; |
| stats->tx_dropped++; |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| static void ip6_tnl_link_config(struct ip6_tnl *t) |
| { |
| struct net_device *dev = t->dev; |
| struct net_device *tdev = NULL; |
| struct __ip6_tnl_parm *p = &t->parms; |
| struct flowi6 *fl6 = &t->fl.u.ip6; |
| unsigned int mtu; |
| int t_hlen; |
| |
| memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
| memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); |
| |
| /* Set up flowi template */ |
| fl6->saddr = p->laddr; |
| fl6->daddr = p->raddr; |
| fl6->flowi6_oif = p->link; |
| fl6->flowlabel = 0; |
| |
| if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) |
| fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
| if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
| fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
| |
| p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
| p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); |
| |
| if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) |
| dev->flags |= IFF_POINTOPOINT; |
| else |
| dev->flags &= ~IFF_POINTOPOINT; |
| |
| t->tun_hlen = 0; |
| t->hlen = t->encap_hlen + t->tun_hlen; |
| t_hlen = t->hlen + sizeof(struct ipv6hdr); |
| |
| if (p->flags & IP6_TNL_F_CAP_XMIT) { |
| int strict = (ipv6_addr_type(&p->raddr) & |
| (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); |
| |
| struct rt6_info *rt = rt6_lookup(t->net, |
| &p->raddr, &p->laddr, |
| p->link, NULL, strict); |
| if (rt) { |
| tdev = rt->dst.dev; |
| ip6_rt_put(rt); |
| } |
| |
| if (!tdev && p->link) |
| tdev = __dev_get_by_index(t->net, p->link); |
| |
| if (tdev) { |
| dev->hard_header_len = tdev->hard_header_len + t_hlen; |
| mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU); |
| |
| dev->mtu = mtu - t_hlen; |
| if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| dev->mtu -= 8; |
| |
| if (dev->mtu < IPV6_MIN_MTU) |
| dev->mtu = IPV6_MIN_MTU; |
| } |
| } |
| } |
| |
| /** |
| * ip6_tnl_change - update the tunnel parameters |
| * @t: tunnel to be changed |
| * @p: tunnel configuration parameters |
| * |
| * Description: |
| * ip6_tnl_change() updates the tunnel parameters |
| **/ |
| |
| static int |
| ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
| { |
| t->parms.laddr = p->laddr; |
| t->parms.raddr = p->raddr; |
| t->parms.flags = p->flags; |
| t->parms.hop_limit = p->hop_limit; |
| t->parms.encap_limit = p->encap_limit; |
| t->parms.flowinfo = p->flowinfo; |
| t->parms.link = p->link; |
| t->parms.proto = p->proto; |
| t->parms.fwmark = p->fwmark; |
| dst_cache_reset(&t->dst_cache); |
| ip6_tnl_link_config(t); |
| return 0; |
| } |
| |
| static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
| { |
| struct net *net = t->net; |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| int err; |
| |
| ip6_tnl_unlink(ip6n, t); |
| synchronize_net(); |
| err = ip6_tnl_change(t, p); |
| ip6_tnl_link(ip6n, t); |
| netdev_state_change(t->dev); |
| return err; |
| } |
| |
| static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
| { |
| /* for default tnl0 device allow to change only the proto */ |
| t->parms.proto = p->proto; |
| netdev_state_change(t->dev); |
| return 0; |
| } |
| |
| static void |
| ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) |
| { |
| p->laddr = u->laddr; |
| p->raddr = u->raddr; |
| p->flags = u->flags; |
| p->hop_limit = u->hop_limit; |
| p->encap_limit = u->encap_limit; |
| p->flowinfo = u->flowinfo; |
| p->link = u->link; |
| p->proto = u->proto; |
| memcpy(p->name, u->name, sizeof(u->name)); |
| } |
| |
| static void |
| ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) |
| { |
| u->laddr = p->laddr; |
| u->raddr = p->raddr; |
| u->flags = p->flags; |
| u->hop_limit = p->hop_limit; |
| u->encap_limit = p->encap_limit; |
| u->flowinfo = p->flowinfo; |
| u->link = p->link; |
| u->proto = p->proto; |
| memcpy(u->name, p->name, sizeof(u->name)); |
| } |
| |
| /** |
| * ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
| * @dev: virtual device associated with tunnel |
| * @ifr: parameters passed from userspace |
| * @cmd: command to be performed |
| * |
| * Description: |
| * ip6_tnl_ioctl() is used for managing IPv6 tunnels |
| * from userspace. |
| * |
| * The possible commands are the following: |
| * %SIOCGETTUNNEL: get tunnel parameters for device |
| * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters |
| * %SIOCCHGTUNNEL: change tunnel parameters to those given |
| * %SIOCDELTUNNEL: delete tunnel |
| * |
| * The fallback device "ip6tnl0", created during module |
| * initialization, can be used for creating other tunnel devices. |
| * |
| * Return: |
| * 0 on success, |
| * %-EFAULT if unable to copy data to or from userspace, |
| * %-EPERM if current process hasn't %CAP_NET_ADMIN set |
| * %-EINVAL if passed tunnel parameters are invalid, |
| * %-EEXIST if changing a tunnel's parameters would cause a conflict |
| * %-ENODEV if attempting to change or delete a nonexisting device |
| **/ |
| |
| static int |
| ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| { |
| int err = 0; |
| struct ip6_tnl_parm p; |
| struct __ip6_tnl_parm p1; |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct net *net = t->net; |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| |
| memset(&p1, 0, sizeof(p1)); |
| |
| switch (cmd) { |
| case SIOCGETTUNNEL: |
| if (dev == ip6n->fb_tnl_dev) { |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| err = -EFAULT; |
| break; |
| } |
| ip6_tnl_parm_from_user(&p1, &p); |
| t = ip6_tnl_locate(net, &p1, 0); |
| if (IS_ERR(t)) |
| t = netdev_priv(dev); |
| } else { |
| memset(&p, 0, sizeof(p)); |
| } |
| ip6_tnl_parm_to_user(&p, &t->parms); |
| if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { |
| err = -EFAULT; |
| } |
| break; |
| case SIOCADDTUNNEL: |
| case SIOCCHGTUNNEL: |
| err = -EPERM; |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| break; |
| err = -EFAULT; |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| break; |
| err = -EINVAL; |
| if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && |
| p.proto != 0) |
| break; |
| ip6_tnl_parm_from_user(&p1, &p); |
| t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); |
| if (cmd == SIOCCHGTUNNEL) { |
| if (!IS_ERR(t)) { |
| if (t->dev != dev) { |
| err = -EEXIST; |
| break; |
| } |
| } else |
| t = netdev_priv(dev); |
| if (dev == ip6n->fb_tnl_dev) |
| err = ip6_tnl0_update(t, &p1); |
| else |
| err = ip6_tnl_update(t, &p1); |
| } |
| if (!IS_ERR(t)) { |
| err = 0; |
| ip6_tnl_parm_to_user(&p, &t->parms); |
| if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| err = -EFAULT; |
| |
| } else { |
| err = PTR_ERR(t); |
| } |
| break; |
| case SIOCDELTUNNEL: |
| err = -EPERM; |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| break; |
| |
| if (dev == ip6n->fb_tnl_dev) { |
| err = -EFAULT; |
| if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| break; |
| err = -ENOENT; |
| ip6_tnl_parm_from_user(&p1, &p); |
| t = ip6_tnl_locate(net, &p1, 0); |
| if (IS_ERR(t)) |
| break; |
| err = -EPERM; |
| if (t->dev == ip6n->fb_tnl_dev) |
| break; |
| dev = t->dev; |
| } |
| err = 0; |
| unregister_netdevice(dev); |
| break; |
| default: |
| err = -EINVAL; |
| } |
| return err; |
| } |
| |
| /** |
| * ip6_tnl_change_mtu - change mtu manually for tunnel device |
| * @dev: virtual device associated with tunnel |
| * @new_mtu: the new mtu |
| * |
| * Return: |
| * 0 on success, |
| * %-EINVAL if mtu too small |
| **/ |
| |
| int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| struct ip6_tnl *tnl = netdev_priv(dev); |
| |
| if (tnl->parms.proto == IPPROTO_IPV6) { |
| if (new_mtu < IPV6_MIN_MTU) |
| return -EINVAL; |
| } else { |
| if (new_mtu < ETH_MIN_MTU) |
| return -EINVAL; |
| } |
| if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) { |
| if (new_mtu > IP6_MAX_MTU - dev->hard_header_len) |
| return -EINVAL; |
| } else { |
| if (new_mtu > IP_MAX_MTU - dev->hard_header_len) |
| return -EINVAL; |
| } |
| dev->mtu = new_mtu; |
| return 0; |
| } |
| EXPORT_SYMBOL(ip6_tnl_change_mtu); |
| |
| int ip6_tnl_get_iflink(const struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| |
| return t->parms.link; |
| } |
| EXPORT_SYMBOL(ip6_tnl_get_iflink); |
| |
| int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, |
| unsigned int num) |
| { |
| if (num >= MAX_IPTUN_ENCAP_OPS) |
| return -ERANGE; |
| |
| return !cmpxchg((const struct ip6_tnl_encap_ops **) |
| &ip6tun_encaps[num], |
| NULL, ops) ? 0 : -1; |
| } |
| EXPORT_SYMBOL(ip6_tnl_encap_add_ops); |
| |
| int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, |
| unsigned int num) |
| { |
| int ret; |
| |
| if (num >= MAX_IPTUN_ENCAP_OPS) |
| return -ERANGE; |
| |
| ret = (cmpxchg((const struct ip6_tnl_encap_ops **) |
| &ip6tun_encaps[num], |
| ops, NULL) == ops) ? 0 : -1; |
| |
| synchronize_net(); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(ip6_tnl_encap_del_ops); |
| |
| int ip6_tnl_encap_setup(struct ip6_tnl *t, |
| struct ip_tunnel_encap *ipencap) |
| { |
| int hlen; |
| |
| memset(&t->encap, 0, sizeof(t->encap)); |
| |
| hlen = ip6_encap_hlen(ipencap); |
| if (hlen < 0) |
| return hlen; |
| |
| t->encap.type = ipencap->type; |
| t->encap.sport = ipencap->sport; |
| t->encap.dport = ipencap->dport; |
| t->encap.flags = ipencap->flags; |
| |
| t->encap_hlen = hlen; |
| t->hlen = t->encap_hlen + t->tun_hlen; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); |
| |
| static const struct net_device_ops ip6_tnl_netdev_ops = { |
| .ndo_init = ip6_tnl_dev_init, |
| .ndo_uninit = ip6_tnl_dev_uninit, |
| .ndo_start_xmit = ip6_tnl_start_xmit, |
| .ndo_do_ioctl = ip6_tnl_ioctl, |
| .ndo_change_mtu = ip6_tnl_change_mtu, |
| .ndo_get_stats = ip6_get_stats, |
| .ndo_get_iflink = ip6_tnl_get_iflink, |
| }; |
| |
| #define IPXIPX_FEATURES (NETIF_F_SG | \ |
| NETIF_F_FRAGLIST | \ |
| NETIF_F_HIGHDMA | \ |
| NETIF_F_GSO_SOFTWARE | \ |
| NETIF_F_HW_CSUM) |
| |
| /** |
| * ip6_tnl_dev_setup - setup virtual tunnel device |
| * @dev: virtual device associated with tunnel |
| * |
| * Description: |
| * Initialize function pointers and device parameters |
| **/ |
| |
| static void ip6_tnl_dev_setup(struct net_device *dev) |
| { |
| dev->netdev_ops = &ip6_tnl_netdev_ops; |
| dev->needs_free_netdev = true; |
| dev->priv_destructor = ip6_dev_free; |
| |
| dev->type = ARPHRD_TUNNEL6; |
| dev->flags |= IFF_NOARP; |
| dev->addr_len = sizeof(struct in6_addr); |
| dev->features |= NETIF_F_LLTX; |
| netif_keep_dst(dev); |
| |
| dev->features |= IPXIPX_FEATURES; |
| dev->hw_features |= IPXIPX_FEATURES; |
| |
| /* This perm addr will be used as interface identifier by IPv6 */ |
| dev->addr_assign_type = NET_ADDR_RANDOM; |
| eth_random_addr(dev->perm_addr); |
| } |
| |
| |
| /** |
| * ip6_tnl_dev_init_gen - general initializer for all tunnel devices |
| * @dev: virtual device associated with tunnel |
| **/ |
| |
| static inline int |
| ip6_tnl_dev_init_gen(struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| int ret; |
| int t_hlen; |
| |
| t->dev = dev; |
| t->net = dev_net(dev); |
| dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| if (!dev->tstats) |
| return -ENOMEM; |
| |
| ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); |
| if (ret) |
| goto free_stats; |
| |
| ret = gro_cells_init(&t->gro_cells, dev); |
| if (ret) |
| goto destroy_dst; |
| |
| t->tun_hlen = 0; |
| t->hlen = t->encap_hlen + t->tun_hlen; |
| t_hlen = t->hlen + sizeof(struct ipv6hdr); |
| |
| dev->type = ARPHRD_TUNNEL6; |
| dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
| dev->mtu = ETH_DATA_LEN - t_hlen; |
| if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
| dev->mtu -= 8; |
| dev->min_mtu = ETH_MIN_MTU; |
| dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len; |
| |
| return 0; |
| |
| destroy_dst: |
| dst_cache_destroy(&t->dst_cache); |
| free_stats: |
| free_percpu(dev->tstats); |
| dev->tstats = NULL; |
| |
| return ret; |
| } |
| |
| /** |
| * ip6_tnl_dev_init - initializer for all non fallback tunnel devices |
| * @dev: virtual device associated with tunnel |
| **/ |
| |
| static int ip6_tnl_dev_init(struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| int err = ip6_tnl_dev_init_gen(dev); |
| |
| if (err) |
| return err; |
| ip6_tnl_link_config(t); |
| if (t->parms.collect_md) |
| netif_keep_dst(dev); |
| return 0; |
| } |
| |
| /** |
| * ip6_fb_tnl_dev_init - initializer for fallback tunnel device |
| * @dev: fallback device |
| * |
| * Return: 0 |
| **/ |
| |
| static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct net *net = dev_net(dev); |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| |
| t->parms.proto = IPPROTO_IPV6; |
| dev_hold(dev); |
| |
| rcu_assign_pointer(ip6n->tnls_wc[0], t); |
| return 0; |
| } |
| |
| static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| u8 proto; |
| |
| if (!data || !data[IFLA_IPTUN_PROTO]) |
| return 0; |
| |
| proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); |
| if (proto != IPPROTO_IPV6 && |
| proto != IPPROTO_IPIP && |
| proto != 0) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static void ip6_tnl_netlink_parms(struct nlattr *data[], |
| struct __ip6_tnl_parm *parms) |
| { |
| memset(parms, 0, sizeof(*parms)); |
| |
| if (!data) |
| return; |
| |
| if (data[IFLA_IPTUN_LINK]) |
| parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); |
| |
| if (data[IFLA_IPTUN_LOCAL]) |
| parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); |
| |
| if (data[IFLA_IPTUN_REMOTE]) |
| parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); |
| |
| if (data[IFLA_IPTUN_TTL]) |
| parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); |
| |
| if (data[IFLA_IPTUN_ENCAP_LIMIT]) |
| parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); |
| |
| if (data[IFLA_IPTUN_FLOWINFO]) |
| parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); |
| |
| if (data[IFLA_IPTUN_FLAGS]) |
| parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); |
| |
| if (data[IFLA_IPTUN_PROTO]) |
| parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); |
| |
| if (data[IFLA_IPTUN_COLLECT_METADATA]) |
| parms->collect_md = true; |
| |
| if (data[IFLA_IPTUN_FWMARK]) |
| parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); |
| } |
| |
| static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], |
| struct ip_tunnel_encap *ipencap) |
| { |
| bool ret = false; |
| |
| memset(ipencap, 0, sizeof(*ipencap)); |
| |
| if (!data) |
| return ret; |
| |
| if (data[IFLA_IPTUN_ENCAP_TYPE]) { |
| ret = true; |
| ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); |
| } |
| |
| if (data[IFLA_IPTUN_ENCAP_FLAGS]) { |
| ret = true; |
| ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); |
| } |
| |
| if (data[IFLA_IPTUN_ENCAP_SPORT]) { |
| ret = true; |
| ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); |
| } |
| |
| if (data[IFLA_IPTUN_ENCAP_DPORT]) { |
| ret = true; |
| ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); |
| } |
| |
| return ret; |
| } |
| |
| static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = dev_net(dev); |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| struct ip_tunnel_encap ipencap; |
| struct ip6_tnl *nt, *t; |
| int err; |
| |
| nt = netdev_priv(dev); |
| |
| if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { |
| err = ip6_tnl_encap_setup(nt, &ipencap); |
| if (err < 0) |
| return err; |
| } |
| |
| ip6_tnl_netlink_parms(data, &nt->parms); |
| |
| if (nt->parms.collect_md) { |
| if (rtnl_dereference(ip6n->collect_md_tun)) |
| return -EEXIST; |
| } else { |
| t = ip6_tnl_locate(net, &nt->parms, 0); |
| if (!IS_ERR(t)) |
| return -EEXIST; |
| } |
| |
| err = ip6_tnl_create2(dev); |
| if (!err && tb[IFLA_MTU]) |
| ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); |
| |
| return err; |
| } |
| |
| static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], |
| struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct ip6_tnl *t = netdev_priv(dev); |
| struct __ip6_tnl_parm p; |
| struct net *net = t->net; |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| struct ip_tunnel_encap ipencap; |
| |
| if (dev == ip6n->fb_tnl_dev) |
| return -EINVAL; |
| |
| if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { |
| int err = ip6_tnl_encap_setup(t, &ipencap); |
| |
| if (err < 0) |
| return err; |
| } |
| ip6_tnl_netlink_parms(data, &p); |
| if (p.collect_md) |
| return -EINVAL; |
| |
| t = ip6_tnl_locate(net, &p, 0); |
| if (!IS_ERR(t)) { |
| if (t->dev != dev) |
| return -EEXIST; |
| } else |
| t = netdev_priv(dev); |
| |
| return ip6_tnl_update(t, &p); |
| } |
| |
| static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) |
| { |
| struct net *net = dev_net(dev); |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| |
| if (dev != ip6n->fb_tnl_dev) |
| unregister_netdevice_queue(dev, head); |
| } |
| |
| static size_t ip6_tnl_get_size(const struct net_device *dev) |
| { |
| return |
| /* IFLA_IPTUN_LINK */ |
| nla_total_size(4) + |
| /* IFLA_IPTUN_LOCAL */ |
| nla_total_size(sizeof(struct in6_addr)) + |
| /* IFLA_IPTUN_REMOTE */ |
| nla_total_size(sizeof(struct in6_addr)) + |
| /* IFLA_IPTUN_TTL */ |
| nla_total_size(1) + |
| /* IFLA_IPTUN_ENCAP_LIMIT */ |
| nla_total_size(1) + |
| /* IFLA_IPTUN_FLOWINFO */ |
| nla_total_size(4) + |
| /* IFLA_IPTUN_FLAGS */ |
| nla_total_size(4) + |
| /* IFLA_IPTUN_PROTO */ |
| nla_total_size(1) + |
| /* IFLA_IPTUN_ENCAP_TYPE */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_ENCAP_FLAGS */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_ENCAP_SPORT */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_ENCAP_DPORT */ |
| nla_total_size(2) + |
| /* IFLA_IPTUN_COLLECT_METADATA */ |
| nla_total_size(0) + |
| /* IFLA_IPTUN_FWMARK */ |
| nla_total_size(4) + |
| 0; |
| } |
| |
| static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| struct ip6_tnl *tunnel = netdev_priv(dev); |
| struct __ip6_tnl_parm *parm = &tunnel->parms; |
| |
| if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || |
| nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || |
| nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || |
| nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || |
| nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || |
| nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || |
| nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || |
| nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || |
| nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) |
| goto nla_put_failure; |
| |
| if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || |
| nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || |
| nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || |
| nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) |
| goto nla_put_failure; |
| |
| if (parm->collect_md) |
| if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| struct net *ip6_tnl_get_link_net(const struct net_device *dev) |
| { |
| struct ip6_tnl *tunnel = netdev_priv(dev); |
| |
| return tunnel->net; |
| } |
| EXPORT_SYMBOL(ip6_tnl_get_link_net); |
| |
| static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { |
| [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, |
| [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, |
| [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, |
| [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, |
| [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, |
| [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, |
| [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, |
| [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, |
| [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, |
| [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, |
| [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, |
| }; |
| |
| static struct rtnl_link_ops ip6_link_ops __read_mostly = { |
| .kind = "ip6tnl", |
| .maxtype = IFLA_IPTUN_MAX, |
| .policy = ip6_tnl_policy, |
| .priv_size = sizeof(struct ip6_tnl), |
| .setup = ip6_tnl_dev_setup, |
| .validate = ip6_tnl_validate, |
| .newlink = ip6_tnl_newlink, |
| .changelink = ip6_tnl_changelink, |
| .dellink = ip6_tnl_dellink, |
| .get_size = ip6_tnl_get_size, |
| .fill_info = ip6_tnl_fill_info, |
| .get_link_net = ip6_tnl_get_link_net, |
| }; |
| |
| static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { |
| .handler = ip4ip6_rcv, |
| .err_handler = ip4ip6_err, |
| .priority = 1, |
| }; |
| |
| static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { |
| .handler = ip6ip6_rcv, |
| .err_handler = ip6ip6_err, |
| .priority = 1, |
| }; |
| |
| static struct xfrm6_tunnel mplsip6_handler __read_mostly = { |
| .handler = mplsip6_rcv, |
| .err_handler = mplsip6_err, |
| .priority = 1, |
| }; |
| |
| static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) |
| { |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| struct net_device *dev, *aux; |
| int h; |
| struct ip6_tnl *t; |
| |
| for_each_netdev_safe(net, dev, aux) |
| if (dev->rtnl_link_ops == &ip6_link_ops) |
| unregister_netdevice_queue(dev, list); |
| |
| for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { |
| t = rtnl_dereference(ip6n->tnls_r_l[h]); |
| while (t) { |
| /* If dev is in the same netns, it has already |
| * been added to the list by the previous loop. |
| */ |
| if (!net_eq(dev_net(t->dev), net)) |
| unregister_netdevice_queue(t->dev, list); |
| t = rtnl_dereference(t->next); |
| } |
| } |
| } |
| |
| static int __net_init ip6_tnl_init_net(struct net *net) |
| { |
| struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
| struct ip6_tnl *t = NULL; |
| int err; |
| |
| ip6n->tnls[0] = ip6n->tnls_wc; |
| ip6n->tnls[1] = ip6n->tnls_r_l; |
| |
| if (!net_has_fallback_tunnels(net)) |
| return 0; |
| err = -ENOMEM; |
| ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", |
| NET_NAME_UNKNOWN, ip6_tnl_dev_setup); |
| |
| if (!ip6n->fb_tnl_dev) |
| goto err_alloc_dev; |
| dev_net_set(ip6n->fb_tnl_dev, net); |
| ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; |
| /* FB netdevice is special: we have one, and only one per netns. |
| * Allowing to move it to another netns is clearly unsafe. |
| */ |
| ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; |
| |
| err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
| if (err < 0) |
| goto err_register; |
| |
| err = register_netdev(ip6n->fb_tnl_dev); |
| if (err < 0) |
| goto err_register; |
| |
| t = netdev_priv(ip6n->fb_tnl_dev); |
| |
| strcpy(t->parms.name, ip6n->fb_tnl_dev->name); |
| return 0; |
| |
| err_register: |
| free_netdev(ip6n->fb_tnl_dev); |
| err_alloc_dev: |
| return err; |
| } |
| |
| static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) |
| { |
| struct net *net; |
| LIST_HEAD(list); |
| |
| rtnl_lock(); |
| list_for_each_entry(net, net_list, exit_list) |
| ip6_tnl_destroy_tunnels(net, &list); |
| unregister_netdevice_many(&list); |
| rtnl_unlock(); |
| } |
| |
| static struct pernet_operations ip6_tnl_net_ops = { |
| .init = ip6_tnl_init_net, |
| .exit_batch = ip6_tnl_exit_batch_net, |
| .id = &ip6_tnl_net_id, |
| .size = sizeof(struct ip6_tnl_net), |
| }; |
| |
| /** |
| * ip6_tunnel_init - register protocol and reserve needed resources |
| * |
| * Return: 0 on success |
| **/ |
| |
| static int __init ip6_tunnel_init(void) |
| { |
| int err; |
| |
| if (!ipv6_mod_enabled()) |
| return -EOPNOTSUPP; |
| |
| err = register_pernet_device(&ip6_tnl_net_ops); |
| if (err < 0) |
| goto out_pernet; |
| |
| err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); |
| if (err < 0) { |
| pr_err("%s: can't register ip4ip6\n", __func__); |
| goto out_ip4ip6; |
| } |
| |
| err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); |
| if (err < 0) { |
| pr_err("%s: can't register ip6ip6\n", __func__); |
| goto out_ip6ip6; |
| } |
| |
| if (ip6_tnl_mpls_supported()) { |
| err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS); |
| if (err < 0) { |
| pr_err("%s: can't register mplsip6\n", __func__); |
| goto out_mplsip6; |
| } |
| } |
| |
| err = rtnl_link_register(&ip6_link_ops); |
| if (err < 0) |
| goto rtnl_link_failed; |
| |
| return 0; |
| |
| rtnl_link_failed: |
| if (ip6_tnl_mpls_supported()) |
| xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS); |
| out_mplsip6: |
| xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
| out_ip6ip6: |
| xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); |
| out_ip4ip6: |
| unregister_pernet_device(&ip6_tnl_net_ops); |
| out_pernet: |
| return err; |
| } |
| |
| /** |
| * ip6_tunnel_cleanup - free resources and unregister protocol |
| **/ |
| |
| static void __exit ip6_tunnel_cleanup(void) |
| { |
| rtnl_link_unregister(&ip6_link_ops); |
| if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) |
| pr_info("%s: can't deregister ip4ip6\n", __func__); |
| |
| if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
| pr_info("%s: can't deregister ip6ip6\n", __func__); |
| |
| if (ip6_tnl_mpls_supported() && |
| xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS)) |
| pr_info("%s: can't deregister mplsip6\n", __func__); |
| unregister_pernet_device(&ip6_tnl_net_ops); |
| } |
| |
| module_init(ip6_tunnel_init); |
| module_exit(ip6_tunnel_cleanup); |