Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2013 Nicira, Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of version 2 of the GNU General Public |
| 6 | * License as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301, USA |
| 17 | */ |
| 18 | |
| 19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 20 | |
| 21 | #include <linux/capability.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/uaccess.h> |
| 27 | #include <linux/skbuff.h> |
| 28 | #include <linux/netdevice.h> |
| 29 | #include <linux/in.h> |
| 30 | #include <linux/tcp.h> |
| 31 | #include <linux/udp.h> |
| 32 | #include <linux/if_arp.h> |
| 33 | #include <linux/mroute.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/in6.h> |
| 36 | #include <linux/inetdevice.h> |
| 37 | #include <linux/igmp.h> |
| 38 | #include <linux/netfilter_ipv4.h> |
| 39 | #include <linux/etherdevice.h> |
| 40 | #include <linux/if_ether.h> |
| 41 | #include <linux/if_vlan.h> |
| 42 | #include <linux/rculist.h> |
Sachin Kamat | 27d79f3 | 2014-01-27 12:13:57 +0530 | [diff] [blame] | 43 | #include <linux/err.h> |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 44 | |
| 45 | #include <net/sock.h> |
| 46 | #include <net/ip.h> |
| 47 | #include <net/icmp.h> |
| 48 | #include <net/protocol.h> |
| 49 | #include <net/ip_tunnels.h> |
| 50 | #include <net/arp.h> |
| 51 | #include <net/checksum.h> |
| 52 | #include <net/dsfield.h> |
| 53 | #include <net/inet_ecn.h> |
| 54 | #include <net/xfrm.h> |
| 55 | #include <net/net_namespace.h> |
| 56 | #include <net/netns/generic.h> |
| 57 | #include <net/rtnetlink.h> |
| 58 | |
| 59 | #if IS_ENABLED(CONFIG_IPV6) |
| 60 | #include <net/ipv6.h> |
| 61 | #include <net/ip6_fib.h> |
| 62 | #include <net/ip6_route.h> |
| 63 | #endif |
| 64 | |
Duan Jiong | 967680e | 2014-01-19 16:43:42 +0800 | [diff] [blame] | 65 | static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 66 | { |
| 67 | return hash_32((__force u32)key ^ (__force u32)remote, |
| 68 | IP_TNL_HASH_BITS); |
| 69 | } |
| 70 | |
Eric Dumazet | 6c7e761 | 2014-01-16 16:41:19 -0800 | [diff] [blame] | 71 | static void __tunnel_dst_set(struct ip_tunnel_dst *idst, |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 72 | struct dst_entry *dst, __be32 saddr) |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 73 | { |
| 74 | struct dst_entry *old_dst; |
| 75 | |
Eric Dumazet | f886497 | 2014-06-24 10:05:11 -0700 | [diff] [blame] | 76 | dst_clone(dst); |
Eric Dumazet | 6c7e761 | 2014-01-16 16:41:19 -0800 | [diff] [blame] | 77 | old_dst = xchg((__force struct dst_entry **)&idst->dst, dst); |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 78 | dst_release(old_dst); |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 79 | idst->saddr = saddr; |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 80 | } |
| 81 | |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 82 | static void tunnel_dst_set(struct ip_tunnel *t, |
| 83 | struct dst_entry *dst, __be32 saddr) |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 84 | { |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 85 | __tunnel_dst_set(this_cpu_ptr(t->dst_cache), dst, saddr); |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 86 | } |
| 87 | |
Eric Dumazet | 6c7e761 | 2014-01-16 16:41:19 -0800 | [diff] [blame] | 88 | static void tunnel_dst_reset(struct ip_tunnel *t) |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 89 | { |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 90 | tunnel_dst_set(t, NULL, 0); |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 91 | } |
| 92 | |
Nicolas Dichtel | cf71d2bc | 2014-02-20 10:19:31 +0100 | [diff] [blame] | 93 | void ip_tunnel_dst_reset_all(struct ip_tunnel *t) |
Tom Herbert | 9a4aa9a | 2014-01-02 11:48:33 -0800 | [diff] [blame] | 94 | { |
| 95 | int i; |
| 96 | |
| 97 | for_each_possible_cpu(i) |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 98 | __tunnel_dst_set(per_cpu_ptr(t->dst_cache, i), NULL, 0); |
Tom Herbert | 9a4aa9a | 2014-01-02 11:48:33 -0800 | [diff] [blame] | 99 | } |
Nicolas Dichtel | cf71d2bc | 2014-02-20 10:19:31 +0100 | [diff] [blame] | 100 | EXPORT_SYMBOL(ip_tunnel_dst_reset_all); |
Tom Herbert | 9a4aa9a | 2014-01-02 11:48:33 -0800 | [diff] [blame] | 101 | |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 102 | static struct rtable *tunnel_rtable_get(struct ip_tunnel *t, |
| 103 | u32 cookie, __be32 *saddr) |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 104 | { |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 105 | struct ip_tunnel_dst *idst; |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 106 | struct dst_entry *dst; |
| 107 | |
| 108 | rcu_read_lock(); |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 109 | idst = this_cpu_ptr(t->dst_cache); |
| 110 | dst = rcu_dereference(idst->dst); |
Eric Dumazet | f886497 | 2014-06-24 10:05:11 -0700 | [diff] [blame] | 111 | if (dst && !atomic_inc_not_zero(&dst->__refcnt)) |
| 112 | dst = NULL; |
Eric Dumazet | b045d37 | 2014-02-03 12:52:14 -0800 | [diff] [blame] | 113 | if (dst) { |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 114 | if (!dst->obsolete || dst->ops->check(dst, cookie)) { |
| 115 | *saddr = idst->saddr; |
| 116 | } else { |
Eric Dumazet | b045d37 | 2014-02-03 12:52:14 -0800 | [diff] [blame] | 117 | tunnel_dst_reset(t); |
Eric Dumazet | f886497 | 2014-06-24 10:05:11 -0700 | [diff] [blame] | 118 | dst_release(dst); |
| 119 | dst = NULL; |
Eric Dumazet | b045d37 | 2014-02-03 12:52:14 -0800 | [diff] [blame] | 120 | } |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 121 | } |
Eric Dumazet | b045d37 | 2014-02-03 12:52:14 -0800 | [diff] [blame] | 122 | rcu_read_unlock(); |
| 123 | return (struct rtable *)dst; |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 124 | } |
| 125 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 126 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, |
| 127 | __be16 flags, __be32 key) |
| 128 | { |
| 129 | if (p->i_flags & TUNNEL_KEY) { |
| 130 | if (flags & TUNNEL_KEY) |
| 131 | return key == p->i_key; |
| 132 | else |
| 133 | /* key expected, none present */ |
| 134 | return false; |
| 135 | } else |
| 136 | return !(flags & TUNNEL_KEY); |
| 137 | } |
| 138 | |
| 139 | /* Fallback tunnel: no source, no destination, no key, no options |
| 140 | |
| 141 | Tunnel hash table: |
| 142 | We require exact key match i.e. if a key is present in packet |
| 143 | it will match only tunnel with the same key; if it is not present, |
| 144 | it will match only keyless tunnel. |
| 145 | |
| 146 | All keysless packets, if not matched configured keyless tunnels |
| 147 | will match fallback tunnel. |
| 148 | Given src, dst and key, find appropriate for input tunnel. |
| 149 | */ |
| 150 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, |
| 151 | int link, __be16 flags, |
| 152 | __be32 remote, __be32 local, |
| 153 | __be32 key) |
| 154 | { |
| 155 | unsigned int hash; |
| 156 | struct ip_tunnel *t, *cand = NULL; |
| 157 | struct hlist_head *head; |
| 158 | |
Duan Jiong | 967680e | 2014-01-19 16:43:42 +0800 | [diff] [blame] | 159 | hash = ip_tunnel_hash(key, remote); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 160 | head = &itn->tunnels[hash]; |
| 161 | |
| 162 | hlist_for_each_entry_rcu(t, head, hash_node) { |
| 163 | if (local != t->parms.iph.saddr || |
| 164 | remote != t->parms.iph.daddr || |
| 165 | !(t->dev->flags & IFF_UP)) |
| 166 | continue; |
| 167 | |
| 168 | if (!ip_tunnel_key_match(&t->parms, flags, key)) |
| 169 | continue; |
| 170 | |
| 171 | if (t->parms.link == link) |
| 172 | return t; |
| 173 | else |
| 174 | cand = t; |
| 175 | } |
| 176 | |
| 177 | hlist_for_each_entry_rcu(t, head, hash_node) { |
| 178 | if (remote != t->parms.iph.daddr || |
Dmitry Popov | e005659 | 2014-07-05 02:26:37 +0400 | [diff] [blame] | 179 | t->parms.iph.saddr != 0 || |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 180 | !(t->dev->flags & IFF_UP)) |
| 181 | continue; |
| 182 | |
| 183 | if (!ip_tunnel_key_match(&t->parms, flags, key)) |
| 184 | continue; |
| 185 | |
| 186 | if (t->parms.link == link) |
| 187 | return t; |
| 188 | else if (!cand) |
| 189 | cand = t; |
| 190 | } |
| 191 | |
Duan Jiong | 967680e | 2014-01-19 16:43:42 +0800 | [diff] [blame] | 192 | hash = ip_tunnel_hash(key, 0); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 193 | head = &itn->tunnels[hash]; |
| 194 | |
| 195 | hlist_for_each_entry_rcu(t, head, hash_node) { |
Dmitry Popov | e005659 | 2014-07-05 02:26:37 +0400 | [diff] [blame] | 196 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
| 197 | (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) |
| 198 | continue; |
| 199 | |
| 200 | if (!(t->dev->flags & IFF_UP)) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 201 | continue; |
| 202 | |
| 203 | if (!ip_tunnel_key_match(&t->parms, flags, key)) |
| 204 | continue; |
| 205 | |
| 206 | if (t->parms.link == link) |
| 207 | return t; |
| 208 | else if (!cand) |
| 209 | cand = t; |
| 210 | } |
| 211 | |
| 212 | if (flags & TUNNEL_NO_KEY) |
| 213 | goto skip_key_lookup; |
| 214 | |
| 215 | hlist_for_each_entry_rcu(t, head, hash_node) { |
| 216 | if (t->parms.i_key != key || |
Dmitry Popov | e005659 | 2014-07-05 02:26:37 +0400 | [diff] [blame] | 217 | t->parms.iph.saddr != 0 || |
| 218 | t->parms.iph.daddr != 0 || |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 219 | !(t->dev->flags & IFF_UP)) |
| 220 | continue; |
| 221 | |
| 222 | if (t->parms.link == link) |
| 223 | return t; |
| 224 | else if (!cand) |
| 225 | cand = t; |
| 226 | } |
| 227 | |
| 228 | skip_key_lookup: |
| 229 | if (cand) |
| 230 | return cand; |
| 231 | |
| 232 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) |
| 233 | return netdev_priv(itn->fb_tunnel_dev); |
| 234 | |
| 235 | |
| 236 | return NULL; |
| 237 | } |
| 238 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); |
| 239 | |
| 240 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, |
| 241 | struct ip_tunnel_parm *parms) |
| 242 | { |
| 243 | unsigned int h; |
| 244 | __be32 remote; |
Steffen Klassert | 6d608f0 | 2014-02-21 08:41:09 +0100 | [diff] [blame] | 245 | __be32 i_key = parms->i_key; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 246 | |
| 247 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) |
| 248 | remote = parms->iph.daddr; |
| 249 | else |
| 250 | remote = 0; |
| 251 | |
Steffen Klassert | 6d608f0 | 2014-02-21 08:41:09 +0100 | [diff] [blame] | 252 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
| 253 | i_key = 0; |
| 254 | |
| 255 | h = ip_tunnel_hash(i_key, remote); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 256 | return &itn->tunnels[h]; |
| 257 | } |
| 258 | |
| 259 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
| 260 | { |
| 261 | struct hlist_head *head = ip_bucket(itn, &t->parms); |
| 262 | |
| 263 | hlist_add_head_rcu(&t->hash_node, head); |
| 264 | } |
| 265 | |
| 266 | static void ip_tunnel_del(struct ip_tunnel *t) |
| 267 | { |
| 268 | hlist_del_init_rcu(&t->hash_node); |
| 269 | } |
| 270 | |
| 271 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, |
| 272 | struct ip_tunnel_parm *parms, |
| 273 | int type) |
| 274 | { |
| 275 | __be32 remote = parms->iph.daddr; |
| 276 | __be32 local = parms->iph.saddr; |
| 277 | __be32 key = parms->i_key; |
Dmitry Popov | 5ce54af | 2014-06-08 03:03:08 +0400 | [diff] [blame] | 278 | __be16 flags = parms->i_flags; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 279 | int link = parms->link; |
| 280 | struct ip_tunnel *t = NULL; |
| 281 | struct hlist_head *head = ip_bucket(itn, parms); |
| 282 | |
| 283 | hlist_for_each_entry_rcu(t, head, hash_node) { |
| 284 | if (local == t->parms.iph.saddr && |
| 285 | remote == t->parms.iph.daddr && |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 286 | link == t->parms.link && |
Dmitry Popov | 5ce54af | 2014-06-08 03:03:08 +0400 | [diff] [blame] | 287 | type == t->dev->type && |
| 288 | ip_tunnel_key_match(&t->parms, flags, key)) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 289 | break; |
| 290 | } |
| 291 | return t; |
| 292 | } |
| 293 | |
| 294 | static struct net_device *__ip_tunnel_create(struct net *net, |
| 295 | const struct rtnl_link_ops *ops, |
| 296 | struct ip_tunnel_parm *parms) |
| 297 | { |
| 298 | int err; |
| 299 | struct ip_tunnel *tunnel; |
| 300 | struct net_device *dev; |
| 301 | char name[IFNAMSIZ]; |
| 302 | |
| 303 | if (parms->name[0]) |
| 304 | strlcpy(name, parms->name, IFNAMSIZ); |
| 305 | else { |
Pravin B Shelar | 54a5d38 | 2013-03-28 08:21:46 +0000 | [diff] [blame] | 306 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 307 | err = -E2BIG; |
| 308 | goto failed; |
| 309 | } |
| 310 | strlcpy(name, ops->kind, IFNAMSIZ); |
| 311 | strncat(name, "%d", 2); |
| 312 | } |
| 313 | |
| 314 | ASSERT_RTNL(); |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 315 | dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 316 | if (!dev) { |
| 317 | err = -ENOMEM; |
| 318 | goto failed; |
| 319 | } |
| 320 | dev_net_set(dev, net); |
| 321 | |
| 322 | dev->rtnl_link_ops = ops; |
| 323 | |
| 324 | tunnel = netdev_priv(dev); |
| 325 | tunnel->parms = *parms; |
Nicolas Dichtel | 5e6700b | 2013-06-26 16:11:28 +0200 | [diff] [blame] | 326 | tunnel->net = net; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 327 | |
| 328 | err = register_netdevice(dev); |
| 329 | if (err) |
| 330 | goto failed_free; |
| 331 | |
| 332 | return dev; |
| 333 | |
| 334 | failed_free: |
| 335 | free_netdev(dev); |
| 336 | failed: |
| 337 | return ERR_PTR(err); |
| 338 | } |
| 339 | |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 340 | static inline void init_tunnel_flow(struct flowi4 *fl4, |
| 341 | int proto, |
| 342 | __be32 daddr, __be32 saddr, |
| 343 | __be32 key, __u8 tos, int oif) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 344 | { |
| 345 | memset(fl4, 0, sizeof(*fl4)); |
| 346 | fl4->flowi4_oif = oif; |
| 347 | fl4->daddr = daddr; |
| 348 | fl4->saddr = saddr; |
| 349 | fl4->flowi4_tos = tos; |
| 350 | fl4->flowi4_proto = proto; |
| 351 | fl4->fl4_gre_key = key; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | static int ip_tunnel_bind_dev(struct net_device *dev) |
| 355 | { |
| 356 | struct net_device *tdev = NULL; |
| 357 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 358 | const struct iphdr *iph; |
| 359 | int hlen = LL_MAX_HEADER; |
| 360 | int mtu = ETH_DATA_LEN; |
| 361 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
| 362 | |
| 363 | iph = &tunnel->parms.iph; |
| 364 | |
| 365 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
| 366 | if (iph->daddr) { |
| 367 | struct flowi4 fl4; |
| 368 | struct rtable *rt; |
| 369 | |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 370 | init_tunnel_flow(&fl4, iph->protocol, iph->daddr, |
| 371 | iph->saddr, tunnel->parms.o_key, |
| 372 | RT_TOS(iph->tos), tunnel->parms.link); |
| 373 | rt = ip_route_output_key(tunnel->net, &fl4); |
| 374 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 375 | if (!IS_ERR(rt)) { |
| 376 | tdev = rt->dst.dev; |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 377 | tunnel_dst_set(tunnel, &rt->dst, fl4.saddr); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 378 | ip_rt_put(rt); |
| 379 | } |
| 380 | if (dev->type != ARPHRD_ETHER) |
| 381 | dev->flags |= IFF_POINTOPOINT; |
| 382 | } |
| 383 | |
| 384 | if (!tdev && tunnel->parms.link) |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 385 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 386 | |
| 387 | if (tdev) { |
| 388 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
| 389 | mtu = tdev->mtu; |
| 390 | } |
| 391 | dev->iflink = tunnel->parms.link; |
| 392 | |
| 393 | dev->needed_headroom = t_hlen + hlen; |
| 394 | mtu -= (dev->hard_header_len + t_hlen); |
| 395 | |
| 396 | if (mtu < 68) |
| 397 | mtu = 68; |
| 398 | |
| 399 | return mtu; |
| 400 | } |
| 401 | |
| 402 | static struct ip_tunnel *ip_tunnel_create(struct net *net, |
| 403 | struct ip_tunnel_net *itn, |
| 404 | struct ip_tunnel_parm *parms) |
| 405 | { |
Julia Lawall | 4929fd8 | 2014-05-15 05:43:20 +0200 | [diff] [blame] | 406 | struct ip_tunnel *nt; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 407 | struct net_device *dev; |
| 408 | |
| 409 | BUG_ON(!itn->fb_tunnel_dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 410 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); |
| 411 | if (IS_ERR(dev)) |
Florian Westphal | 6dd3c9e | 2014-02-14 13:14:39 +0100 | [diff] [blame] | 412 | return ERR_CAST(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 413 | |
| 414 | dev->mtu = ip_tunnel_bind_dev(dev); |
| 415 | |
| 416 | nt = netdev_priv(dev); |
| 417 | ip_tunnel_add(itn, nt); |
| 418 | return nt; |
| 419 | } |
| 420 | |
| 421 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, |
| 422 | const struct tnl_ptk_info *tpi, bool log_ecn_error) |
| 423 | { |
Li RongQing | 8f84985 | 2014-01-04 13:57:59 +0800 | [diff] [blame] | 424 | struct pcpu_sw_netstats *tstats; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 425 | const struct iphdr *iph = ip_hdr(skb); |
| 426 | int err; |
| 427 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 428 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
| 429 | if (ipv4_is_multicast(iph->daddr)) { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 430 | tunnel->dev->stats.multicast++; |
| 431 | skb->pkt_type = PACKET_BROADCAST; |
| 432 | } |
| 433 | #endif |
| 434 | |
| 435 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || |
| 436 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { |
| 437 | tunnel->dev->stats.rx_crc_errors++; |
| 438 | tunnel->dev->stats.rx_errors++; |
| 439 | goto drop; |
| 440 | } |
| 441 | |
| 442 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { |
| 443 | if (!(tpi->flags&TUNNEL_SEQ) || |
| 444 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { |
| 445 | tunnel->dev->stats.rx_fifo_errors++; |
| 446 | tunnel->dev->stats.rx_errors++; |
| 447 | goto drop; |
| 448 | } |
| 449 | tunnel->i_seqno = ntohl(tpi->seq) + 1; |
| 450 | } |
| 451 | |
Ying Cai | e96f2e7 | 2014-05-04 15:20:04 -0700 | [diff] [blame] | 452 | skb_reset_network_header(skb); |
| 453 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 454 | err = IP_ECN_decapsulate(iph, skb); |
| 455 | if (unlikely(err)) { |
| 456 | if (log_ecn_error) |
| 457 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", |
| 458 | &iph->saddr, iph->tos); |
| 459 | if (err > 1) { |
| 460 | ++tunnel->dev->stats.rx_frame_errors; |
| 461 | ++tunnel->dev->stats.rx_errors; |
| 462 | goto drop; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
| 467 | u64_stats_update_begin(&tstats->syncp); |
| 468 | tstats->rx_packets++; |
| 469 | tstats->rx_bytes += skb->len; |
| 470 | u64_stats_update_end(&tstats->syncp); |
| 471 | |
Alexei Starovoitov | 81b9eab | 2013-11-12 14:39:13 -0800 | [diff] [blame] | 472 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
| 473 | |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 474 | if (tunnel->dev->type == ARPHRD_ETHER) { |
| 475 | skb->protocol = eth_type_trans(skb, tunnel->dev); |
| 476 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
| 477 | } else { |
| 478 | skb->dev = tunnel->dev; |
| 479 | } |
Nicolas Dichtel | 64261f2 | 2013-08-13 17:51:09 +0200 | [diff] [blame] | 480 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 481 | gro_cells_receive(&tunnel->gro_cells, skb); |
| 482 | return 0; |
| 483 | |
| 484 | drop: |
| 485 | kfree_skb(skb); |
| 486 | return 0; |
| 487 | } |
| 488 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); |
| 489 | |
Pravin B Shelar | 23a3647 | 2013-07-02 10:57:33 -0700 | [diff] [blame] | 490 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
| 491 | struct rtable *rt, __be16 df) |
| 492 | { |
| 493 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Alexander Duyck | 8c91e16 | 2013-07-11 13:12:22 -0700 | [diff] [blame] | 494 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
Pravin B Shelar | 23a3647 | 2013-07-02 10:57:33 -0700 | [diff] [blame] | 495 | int mtu; |
| 496 | |
| 497 | if (df) |
| 498 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len |
| 499 | - sizeof(struct iphdr) - tunnel->hlen; |
| 500 | else |
| 501 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
| 502 | |
| 503 | if (skb_dst(skb)) |
| 504 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); |
| 505 | |
| 506 | if (skb->protocol == htons(ETH_P_IP)) { |
| 507 | if (!skb_is_gso(skb) && |
| 508 | (df & htons(IP_DF)) && mtu < pkt_size) { |
| 509 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| 510 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
| 511 | return -E2BIG; |
| 512 | } |
| 513 | } |
| 514 | #if IS_ENABLED(CONFIG_IPV6) |
| 515 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 516 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
| 517 | |
| 518 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && |
| 519 | mtu >= IPV6_MIN_MTU) { |
| 520 | if ((tunnel->parms.iph.daddr && |
| 521 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || |
| 522 | rt6->rt6i_dst.plen == 128) { |
| 523 | rt6->rt6i_flags |= RTF_MODIFIED; |
| 524 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && |
| 529 | mtu < pkt_size) { |
| 530 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| 531 | return -E2BIG; |
| 532 | } |
| 533 | } |
| 534 | #endif |
| 535 | return 0; |
| 536 | } |
| 537 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 538 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
Nicolas Dichtel | bf3d6a8 | 2013-05-27 23:48:15 +0000 | [diff] [blame] | 539 | const struct iphdr *tnl_params, const u8 protocol) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 540 | { |
| 541 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 542 | const struct iphdr *inner_iph; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 543 | struct flowi4 fl4; |
| 544 | u8 tos, ttl; |
| 545 | __be16 df; |
Eric Dumazet | b045d37 | 2014-02-03 12:52:14 -0800 | [diff] [blame] | 546 | struct rtable *rt; /* Route to the other host */ |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 547 | unsigned int max_headroom; /* The extra header space needed */ |
| 548 | __be32 dst; |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 549 | int err; |
Timo Teräs | 22fb22e | 2014-05-16 08:34:39 +0300 | [diff] [blame] | 550 | bool connected; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 551 | |
| 552 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); |
Timo Teräs | 22fb22e | 2014-05-16 08:34:39 +0300 | [diff] [blame] | 553 | connected = (tunnel->parms.iph.daddr != 0); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 554 | |
| 555 | dst = tnl_params->daddr; |
| 556 | if (dst == 0) { |
| 557 | /* NBMA tunnel */ |
| 558 | |
| 559 | if (skb_dst(skb) == NULL) { |
| 560 | dev->stats.tx_fifo_errors++; |
| 561 | goto tx_error; |
| 562 | } |
| 563 | |
| 564 | if (skb->protocol == htons(ETH_P_IP)) { |
| 565 | rt = skb_rtable(skb); |
| 566 | dst = rt_nexthop(rt, inner_iph->daddr); |
| 567 | } |
| 568 | #if IS_ENABLED(CONFIG_IPV6) |
| 569 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 570 | const struct in6_addr *addr6; |
| 571 | struct neighbour *neigh; |
| 572 | bool do_tx_error_icmp; |
| 573 | int addr_type; |
| 574 | |
| 575 | neigh = dst_neigh_lookup(skb_dst(skb), |
| 576 | &ipv6_hdr(skb)->daddr); |
| 577 | if (neigh == NULL) |
| 578 | goto tx_error; |
| 579 | |
| 580 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
| 581 | addr_type = ipv6_addr_type(addr6); |
| 582 | |
| 583 | if (addr_type == IPV6_ADDR_ANY) { |
| 584 | addr6 = &ipv6_hdr(skb)->daddr; |
| 585 | addr_type = ipv6_addr_type(addr6); |
| 586 | } |
| 587 | |
| 588 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) |
| 589 | do_tx_error_icmp = true; |
| 590 | else { |
| 591 | do_tx_error_icmp = false; |
| 592 | dst = addr6->s6_addr32[3]; |
| 593 | } |
| 594 | neigh_release(neigh); |
| 595 | if (do_tx_error_icmp) |
| 596 | goto tx_error_icmp; |
| 597 | } |
| 598 | #endif |
| 599 | else |
| 600 | goto tx_error; |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 601 | |
| 602 | connected = false; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 603 | } |
| 604 | |
| 605 | tos = tnl_params->tos; |
| 606 | if (tos & 0x1) { |
| 607 | tos &= ~0x1; |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 608 | if (skb->protocol == htons(ETH_P_IP)) { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 609 | tos = inner_iph->tos; |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 610 | connected = false; |
| 611 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 612 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 613 | connected = false; |
| 614 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 615 | } |
| 616 | |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 617 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
| 618 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link); |
| 619 | |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 620 | rt = connected ? tunnel_rtable_get(tunnel, 0, &fl4.saddr) : NULL; |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 621 | |
| 622 | if (!rt) { |
| 623 | rt = ip_route_output_key(tunnel->net, &fl4); |
| 624 | |
| 625 | if (IS_ERR(rt)) { |
| 626 | dev->stats.tx_carrier_errors++; |
| 627 | goto tx_error; |
| 628 | } |
| 629 | if (connected) |
Dmitry Popov | 95cb574 | 2014-07-29 03:07:52 +0400 | [diff] [blame] | 630 | tunnel_dst_set(tunnel, &rt->dst, fl4.saddr); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 631 | } |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 632 | |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 633 | if (rt->dst.dev == dev) { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 634 | ip_rt_put(rt); |
| 635 | dev->stats.collisions++; |
| 636 | goto tx_error; |
| 637 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 638 | |
Pravin B Shelar | 23a3647 | 2013-07-02 10:57:33 -0700 | [diff] [blame] | 639 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) { |
| 640 | ip_rt_put(rt); |
| 641 | goto tx_error; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 642 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 643 | |
| 644 | if (tunnel->err_count > 0) { |
| 645 | if (time_before(jiffies, |
| 646 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { |
| 647 | tunnel->err_count--; |
| 648 | |
Duan Jiong | 11c21a3 | 2014-01-23 14:00:25 +0800 | [diff] [blame] | 649 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 650 | dst_link_failure(skb); |
| 651 | } else |
| 652 | tunnel->err_count = 0; |
| 653 | } |
| 654 | |
Pravin B Shelar | d4a71b1 | 2013-09-25 09:57:47 -0700 | [diff] [blame] | 655 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 656 | ttl = tnl_params->ttl; |
| 657 | if (ttl == 0) { |
| 658 | if (skb->protocol == htons(ETH_P_IP)) |
| 659 | ttl = inner_iph->ttl; |
| 660 | #if IS_ENABLED(CONFIG_IPV6) |
| 661 | else if (skb->protocol == htons(ETH_P_IPV6)) |
| 662 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; |
| 663 | #endif |
| 664 | else |
| 665 | ttl = ip4_dst_hoplimit(&rt->dst); |
| 666 | } |
| 667 | |
Pravin B Shelar | 23a3647 | 2013-07-02 10:57:33 -0700 | [diff] [blame] | 668 | df = tnl_params->frag_off; |
| 669 | if (skb->protocol == htons(ETH_P_IP)) |
| 670 | df |= (inner_iph->frag_off&htons(IP_DF)); |
| 671 | |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 672 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
| 673 | + rt->dst.header_len; |
Steffen Klassert | 3e08f4a | 2013-10-01 11:33:59 +0200 | [diff] [blame] | 674 | if (max_headroom > dev->needed_headroom) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 675 | dev->needed_headroom = max_headroom; |
Steffen Klassert | 3e08f4a | 2013-10-01 11:33:59 +0200 | [diff] [blame] | 676 | |
| 677 | if (skb_cow_head(skb, dev->needed_headroom)) { |
Dmitry Popov | 586d5fc | 2014-06-06 04:34:37 +0400 | [diff] [blame] | 678 | ip_rt_put(rt); |
Steffen Klassert | 3e08f4a | 2013-10-01 11:33:59 +0200 | [diff] [blame] | 679 | dev->stats.tx_dropped++; |
Eric Dumazet | 3acfa1e | 2014-01-18 18:27:49 -0800 | [diff] [blame] | 680 | kfree_skb(skb); |
Steffen Klassert | 3e08f4a | 2013-10-01 11:33:59 +0200 | [diff] [blame] | 681 | return; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 682 | } |
| 683 | |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 684 | err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr, protocol, |
Pravin B Shelar | d4a71b1 | 2013-09-25 09:57:47 -0700 | [diff] [blame] | 685 | tos, ttl, df, !net_eq(tunnel->net, dev_net(dev))); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 686 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 687 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 688 | return; |
| 689 | |
| 690 | #if IS_ENABLED(CONFIG_IPV6) |
| 691 | tx_error_icmp: |
| 692 | dst_link_failure(skb); |
| 693 | #endif |
| 694 | tx_error: |
| 695 | dev->stats.tx_errors++; |
Eric Dumazet | 3acfa1e | 2014-01-18 18:27:49 -0800 | [diff] [blame] | 696 | kfree_skb(skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 697 | } |
| 698 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); |
| 699 | |
| 700 | static void ip_tunnel_update(struct ip_tunnel_net *itn, |
| 701 | struct ip_tunnel *t, |
| 702 | struct net_device *dev, |
| 703 | struct ip_tunnel_parm *p, |
| 704 | bool set_mtu) |
| 705 | { |
| 706 | ip_tunnel_del(t); |
| 707 | t->parms.iph.saddr = p->iph.saddr; |
| 708 | t->parms.iph.daddr = p->iph.daddr; |
| 709 | t->parms.i_key = p->i_key; |
| 710 | t->parms.o_key = p->o_key; |
| 711 | if (dev->type != ARPHRD_ETHER) { |
| 712 | memcpy(dev->dev_addr, &p->iph.saddr, 4); |
| 713 | memcpy(dev->broadcast, &p->iph.daddr, 4); |
| 714 | } |
| 715 | ip_tunnel_add(itn, t); |
| 716 | |
| 717 | t->parms.iph.ttl = p->iph.ttl; |
| 718 | t->parms.iph.tos = p->iph.tos; |
| 719 | t->parms.iph.frag_off = p->iph.frag_off; |
| 720 | |
| 721 | if (t->parms.link != p->link) { |
| 722 | int mtu; |
| 723 | |
| 724 | t->parms.link = p->link; |
| 725 | mtu = ip_tunnel_bind_dev(dev); |
| 726 | if (set_mtu) |
| 727 | dev->mtu = mtu; |
| 728 | } |
Nicolas Dichtel | cf71d2bc | 2014-02-20 10:19:31 +0100 | [diff] [blame] | 729 | ip_tunnel_dst_reset_all(t); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 730 | netdev_state_change(dev); |
| 731 | } |
| 732 | |
| 733 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) |
| 734 | { |
| 735 | int err = 0; |
Nicolas Dichtel | 8c923ce | 2014-04-16 11:19:32 +0200 | [diff] [blame] | 736 | struct ip_tunnel *t = netdev_priv(dev); |
| 737 | struct net *net = t->net; |
| 738 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 739 | |
| 740 | BUG_ON(!itn->fb_tunnel_dev); |
| 741 | switch (cmd) { |
| 742 | case SIOCGETTUNNEL: |
Nicolas Dichtel | 8c923ce | 2014-04-16 11:19:32 +0200 | [diff] [blame] | 743 | if (dev == itn->fb_tunnel_dev) { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 744 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
Nicolas Dichtel | 8c923ce | 2014-04-16 11:19:32 +0200 | [diff] [blame] | 745 | if (t == NULL) |
| 746 | t = netdev_priv(dev); |
| 747 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 748 | memcpy(p, &t->parms, sizeof(*p)); |
| 749 | break; |
| 750 | |
| 751 | case SIOCADDTUNNEL: |
| 752 | case SIOCCHGTUNNEL: |
| 753 | err = -EPERM; |
| 754 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 755 | goto done; |
| 756 | if (p->iph.ttl) |
| 757 | p->iph.frag_off |= htons(IP_DF); |
Dmitry Popov | 7c8e6b9 | 2014-06-08 02:06:25 +0400 | [diff] [blame] | 758 | if (!(p->i_flags & VTI_ISVTI)) { |
| 759 | if (!(p->i_flags & TUNNEL_KEY)) |
| 760 | p->i_key = 0; |
| 761 | if (!(p->o_flags & TUNNEL_KEY)) |
| 762 | p->o_key = 0; |
| 763 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 764 | |
| 765 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
| 766 | |
Florian Westphal | 6dd3c9e | 2014-02-14 13:14:39 +0100 | [diff] [blame] | 767 | if (!t && (cmd == SIOCADDTUNNEL)) { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 768 | t = ip_tunnel_create(net, itn, p); |
Duan Jiong | ee30ef4 | 2014-05-15 13:07:02 +0800 | [diff] [blame] | 769 | err = PTR_ERR_OR_ZERO(t); |
| 770 | break; |
Florian Westphal | 6dd3c9e | 2014-02-14 13:14:39 +0100 | [diff] [blame] | 771 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 772 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
| 773 | if (t != NULL) { |
| 774 | if (t->dev != dev) { |
| 775 | err = -EEXIST; |
| 776 | break; |
| 777 | } |
| 778 | } else { |
| 779 | unsigned int nflags = 0; |
| 780 | |
| 781 | if (ipv4_is_multicast(p->iph.daddr)) |
| 782 | nflags = IFF_BROADCAST; |
| 783 | else if (p->iph.daddr) |
| 784 | nflags = IFF_POINTOPOINT; |
| 785 | |
| 786 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { |
| 787 | err = -EINVAL; |
| 788 | break; |
| 789 | } |
| 790 | |
| 791 | t = netdev_priv(dev); |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | if (t) { |
| 796 | err = 0; |
| 797 | ip_tunnel_update(itn, t, dev, p, true); |
Florian Westphal | 6dd3c9e | 2014-02-14 13:14:39 +0100 | [diff] [blame] | 798 | } else { |
| 799 | err = -ENOENT; |
| 800 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 801 | break; |
| 802 | |
| 803 | case SIOCDELTUNNEL: |
| 804 | err = -EPERM; |
| 805 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 806 | goto done; |
| 807 | |
| 808 | if (dev == itn->fb_tunnel_dev) { |
| 809 | err = -ENOENT; |
| 810 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
| 811 | if (t == NULL) |
| 812 | goto done; |
| 813 | err = -EPERM; |
| 814 | if (t == netdev_priv(itn->fb_tunnel_dev)) |
| 815 | goto done; |
| 816 | dev = t->dev; |
| 817 | } |
| 818 | unregister_netdevice(dev); |
| 819 | err = 0; |
| 820 | break; |
| 821 | |
| 822 | default: |
| 823 | err = -EINVAL; |
| 824 | } |
| 825 | |
| 826 | done: |
| 827 | return err; |
| 828 | } |
| 829 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); |
| 830 | |
| 831 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
| 832 | { |
| 833 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 834 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
| 835 | |
| 836 | if (new_mtu < 68 || |
| 837 | new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen) |
| 838 | return -EINVAL; |
| 839 | dev->mtu = new_mtu; |
| 840 | return 0; |
| 841 | } |
| 842 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
| 843 | |
| 844 | static void ip_tunnel_dev_free(struct net_device *dev) |
| 845 | { |
| 846 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 847 | |
| 848 | gro_cells_destroy(&tunnel->gro_cells); |
Tom Herbert | 9a4aa9a | 2014-01-02 11:48:33 -0800 | [diff] [blame] | 849 | free_percpu(tunnel->dst_cache); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 850 | free_percpu(dev->tstats); |
| 851 | free_netdev(dev); |
| 852 | } |
| 853 | |
| 854 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) |
| 855 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 856 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 857 | struct ip_tunnel_net *itn; |
| 858 | |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 859 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 860 | |
| 861 | if (itn->fb_tunnel_dev != dev) { |
| 862 | ip_tunnel_del(netdev_priv(dev)); |
| 863 | unregister_netdevice_queue(dev, head); |
| 864 | } |
| 865 | } |
| 866 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); |
| 867 | |
Eric Dumazet | d3b6f61 | 2013-06-07 13:26:05 -0700 | [diff] [blame] | 868 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 869 | struct rtnl_link_ops *ops, char *devname) |
| 870 | { |
| 871 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); |
| 872 | struct ip_tunnel_parm parms; |
stephen hemminger | 6261d98 | 2013-08-05 22:51:37 -0700 | [diff] [blame] | 873 | unsigned int i; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 874 | |
stephen hemminger | 6261d98 | 2013-08-05 22:51:37 -0700 | [diff] [blame] | 875 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
| 876 | INIT_HLIST_HEAD(&itn->tunnels[i]); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 877 | |
| 878 | if (!ops) { |
| 879 | itn->fb_tunnel_dev = NULL; |
| 880 | return 0; |
| 881 | } |
stephen hemminger | 6261d98 | 2013-08-05 22:51:37 -0700 | [diff] [blame] | 882 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 883 | memset(&parms, 0, sizeof(parms)); |
| 884 | if (devname) |
| 885 | strlcpy(parms.name, devname, IFNAMSIZ); |
| 886 | |
| 887 | rtnl_lock(); |
| 888 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); |
Dan Carpenter | ea857f2 | 2013-08-19 10:05:10 +0300 | [diff] [blame] | 889 | /* FB netdevice is special: we have one, and only one per netns. |
| 890 | * Allowing to move it to another netns is clearly unsafe. |
| 891 | */ |
Steffen Klassert | 6701328 | 2013-10-01 11:34:48 +0200 | [diff] [blame] | 892 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
Dan Carpenter | b4de77a | 2013-08-23 11:15:37 +0300 | [diff] [blame] | 893 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
Steffen Klassert | 78ff4be | 2014-05-19 11:36:56 +0200 | [diff] [blame] | 894 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
Steffen Klassert | 6701328 | 2013-10-01 11:34:48 +0200 | [diff] [blame] | 895 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
| 896 | } |
Dan Carpenter | b4de77a | 2013-08-23 11:15:37 +0300 | [diff] [blame] | 897 | rtnl_unlock(); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 898 | |
Sachin Kamat | 27d79f3 | 2014-01-27 12:13:57 +0530 | [diff] [blame] | 899 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 900 | } |
| 901 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); |
| 902 | |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 903 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
| 904 | struct rtnl_link_ops *ops) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 905 | { |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 906 | struct net *net = dev_net(itn->fb_tunnel_dev); |
| 907 | struct net_device *dev, *aux; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 908 | int h; |
| 909 | |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 910 | for_each_netdev_safe(net, dev, aux) |
| 911 | if (dev->rtnl_link_ops == ops) |
| 912 | unregister_netdevice_queue(dev, head); |
| 913 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 914 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
| 915 | struct ip_tunnel *t; |
| 916 | struct hlist_node *n; |
| 917 | struct hlist_head *thead = &itn->tunnels[h]; |
| 918 | |
| 919 | hlist_for_each_entry_safe(t, n, thead, hash_node) |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 920 | /* If dev is in the same netns, it has already |
| 921 | * been added to the list by the previous loop. |
| 922 | */ |
| 923 | if (!net_eq(dev_net(t->dev), net)) |
| 924 | unregister_netdevice_queue(t->dev, head); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 925 | } |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 926 | } |
| 927 | |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 928 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 929 | { |
| 930 | LIST_HEAD(list); |
| 931 | |
| 932 | rtnl_lock(); |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 933 | ip_tunnel_destroy(itn, &list, ops); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 934 | unregister_netdevice_many(&list); |
| 935 | rtnl_unlock(); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 936 | } |
| 937 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); |
| 938 | |
| 939 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], |
| 940 | struct ip_tunnel_parm *p) |
| 941 | { |
| 942 | struct ip_tunnel *nt; |
| 943 | struct net *net = dev_net(dev); |
| 944 | struct ip_tunnel_net *itn; |
| 945 | int mtu; |
| 946 | int err; |
| 947 | |
| 948 | nt = netdev_priv(dev); |
| 949 | itn = net_generic(net, nt->ip_tnl_net_id); |
| 950 | |
| 951 | if (ip_tunnel_find(itn, p, dev->type)) |
| 952 | return -EEXIST; |
| 953 | |
Nicolas Dichtel | 5e6700b | 2013-06-26 16:11:28 +0200 | [diff] [blame] | 954 | nt->net = net; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 955 | nt->parms = *p; |
| 956 | err = register_netdevice(dev); |
| 957 | if (err) |
| 958 | goto out; |
| 959 | |
| 960 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
| 961 | eth_hw_addr_random(dev); |
| 962 | |
| 963 | mtu = ip_tunnel_bind_dev(dev); |
| 964 | if (!tb[IFLA_MTU]) |
| 965 | dev->mtu = mtu; |
| 966 | |
| 967 | ip_tunnel_add(itn, nt); |
| 968 | |
| 969 | out: |
| 970 | return err; |
| 971 | } |
| 972 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); |
| 973 | |
| 974 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], |
| 975 | struct ip_tunnel_parm *p) |
| 976 | { |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 977 | struct ip_tunnel *t; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 978 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 979 | struct net *net = tunnel->net; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 980 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
| 981 | |
| 982 | if (dev == itn->fb_tunnel_dev) |
| 983 | return -EINVAL; |
| 984 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 985 | t = ip_tunnel_find(itn, p, dev->type); |
| 986 | |
| 987 | if (t) { |
| 988 | if (t->dev != dev) |
| 989 | return -EEXIST; |
| 990 | } else { |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 991 | t = tunnel; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 992 | |
| 993 | if (dev->type != ARPHRD_ETHER) { |
| 994 | unsigned int nflags = 0; |
| 995 | |
| 996 | if (ipv4_is_multicast(p->iph.daddr)) |
| 997 | nflags = IFF_BROADCAST; |
| 998 | else if (p->iph.daddr) |
| 999 | nflags = IFF_POINTOPOINT; |
| 1000 | |
| 1001 | if ((dev->flags ^ nflags) & |
| 1002 | (IFF_POINTOPOINT | IFF_BROADCAST)) |
| 1003 | return -EINVAL; |
| 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); |
| 1008 | return 0; |
| 1009 | } |
| 1010 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); |
| 1011 | |
| 1012 | int ip_tunnel_init(struct net_device *dev) |
| 1013 | { |
| 1014 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 1015 | struct iphdr *iph = &tunnel->parms.iph; |
WANG Cong | 1c213bd | 2014-02-13 11:46:28 -0800 | [diff] [blame] | 1016 | int err; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1017 | |
| 1018 | dev->destructor = ip_tunnel_dev_free; |
WANG Cong | 1c213bd | 2014-02-13 11:46:28 -0800 | [diff] [blame] | 1019 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1020 | if (!dev->tstats) |
| 1021 | return -ENOMEM; |
| 1022 | |
Tom Herbert | 9a4aa9a | 2014-01-02 11:48:33 -0800 | [diff] [blame] | 1023 | tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst); |
| 1024 | if (!tunnel->dst_cache) { |
| 1025 | free_percpu(dev->tstats); |
| 1026 | return -ENOMEM; |
| 1027 | } |
| 1028 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1029 | err = gro_cells_init(&tunnel->gro_cells, dev); |
| 1030 | if (err) { |
Tom Herbert | 9a4aa9a | 2014-01-02 11:48:33 -0800 | [diff] [blame] | 1031 | free_percpu(tunnel->dst_cache); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1032 | free_percpu(dev->tstats); |
| 1033 | return err; |
| 1034 | } |
| 1035 | |
| 1036 | tunnel->dev = dev; |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 1037 | tunnel->net = dev_net(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1038 | strcpy(tunnel->parms.name, dev->name); |
| 1039 | iph->version = 4; |
| 1040 | iph->ihl = 5; |
| 1041 | |
| 1042 | return 0; |
| 1043 | } |
| 1044 | EXPORT_SYMBOL_GPL(ip_tunnel_init); |
| 1045 | |
| 1046 | void ip_tunnel_uninit(struct net_device *dev) |
| 1047 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1048 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 1049 | struct net *net = tunnel->net; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1050 | struct ip_tunnel_net *itn; |
| 1051 | |
| 1052 | itn = net_generic(net, tunnel->ip_tnl_net_id); |
| 1053 | /* fb_tunnel_dev will be unregisted in net-exit call. */ |
| 1054 | if (itn->fb_tunnel_dev != dev) |
| 1055 | ip_tunnel_del(netdev_priv(dev)); |
Tom Herbert | 7d442fa | 2014-01-02 11:48:26 -0800 | [diff] [blame] | 1056 | |
Nicolas Dichtel | cf71d2bc | 2014-02-20 10:19:31 +0100 | [diff] [blame] | 1057 | ip_tunnel_dst_reset_all(tunnel); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1058 | } |
| 1059 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); |
| 1060 | |
| 1061 | /* Do least required initialization, rest of init is done in tunnel_init call */ |
| 1062 | void ip_tunnel_setup(struct net_device *dev, int net_id) |
| 1063 | { |
| 1064 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 1065 | tunnel->ip_tnl_net_id = net_id; |
| 1066 | } |
| 1067 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); |
| 1068 | |
| 1069 | MODULE_LICENSE("GPL"); |