Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 virtual tunneling interface |
| 3 | * |
| 4 | * Copyright (C) 2013 secunet Security Networks AG |
| 5 | * |
| 6 | * Author: |
| 7 | * Steffen Klassert <steffen.klassert@secunet.com> |
| 8 | * |
| 9 | * Based on: |
| 10 | * net/ipv6/ip6_tunnel.c |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/capability.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/sockios.h> |
| 23 | #include <linux/icmp.h> |
| 24 | #include <linux/if.h> |
| 25 | #include <linux/in.h> |
| 26 | #include <linux/ip.h> |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 27 | #include <linux/net.h> |
| 28 | #include <linux/in6.h> |
| 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/if_arp.h> |
| 31 | #include <linux/icmpv6.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/route.h> |
| 34 | #include <linux/rtnetlink.h> |
| 35 | #include <linux/netfilter_ipv6.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/hash.h> |
| 38 | |
| 39 | #include <linux/uaccess.h> |
| 40 | #include <linux/atomic.h> |
| 41 | |
| 42 | #include <net/icmp.h> |
| 43 | #include <net/ip.h> |
| 44 | #include <net/ip_tunnels.h> |
| 45 | #include <net/ipv6.h> |
| 46 | #include <net/ip6_route.h> |
| 47 | #include <net/addrconf.h> |
| 48 | #include <net/ip6_tunnel.h> |
| 49 | #include <net/xfrm.h> |
| 50 | #include <net/net_namespace.h> |
| 51 | #include <net/netns/generic.h> |
| 52 | |
| 53 | #define HASH_SIZE_SHIFT 5 |
| 54 | #define HASH_SIZE (1 << HASH_SIZE_SHIFT) |
| 55 | |
| 56 | static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) |
| 57 | { |
| 58 | u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); |
| 59 | |
| 60 | return hash_32(hash, HASH_SIZE_SHIFT); |
| 61 | } |
| 62 | |
| 63 | static int vti6_dev_init(struct net_device *dev); |
| 64 | static void vti6_dev_setup(struct net_device *dev); |
| 65 | static struct rtnl_link_ops vti6_link_ops __read_mostly; |
| 66 | |
| 67 | static int vti6_net_id __read_mostly; |
| 68 | struct vti6_net { |
| 69 | /* the vti6 tunnel fallback device */ |
| 70 | struct net_device *fb_tnl_dev; |
| 71 | /* lists for storing tunnels in use */ |
| 72 | struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; |
| 73 | struct ip6_tnl __rcu *tnls_wc[1]; |
| 74 | struct ip6_tnl __rcu **tnls[2]; |
| 75 | }; |
| 76 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 77 | #define for_each_vti6_tunnel_rcu(start) \ |
| 78 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) |
| 79 | |
| 80 | /** |
| 81 | * vti6_tnl_lookup - fetch tunnel matching the end-point addresses |
| 82 | * @net: network namespace |
| 83 | * @remote: the address of the tunnel exit-point |
| 84 | * @local: the address of the tunnel entry-point |
| 85 | * |
| 86 | * Return: |
| 87 | * tunnel matching given end-points if found, |
| 88 | * else fallback tunnel if its device is up, |
| 89 | * else %NULL |
| 90 | **/ |
| 91 | static struct ip6_tnl * |
| 92 | vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, |
| 93 | const struct in6_addr *local) |
| 94 | { |
| 95 | unsigned int hash = HASH(remote, local); |
| 96 | struct ip6_tnl *t; |
| 97 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
Steffen Klassert | fbe68ee | 2014-11-20 10:01:49 +0100 | [diff] [blame] | 98 | struct in6_addr any; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 99 | |
| 100 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| 101 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
| 102 | ipv6_addr_equal(remote, &t->parms.raddr) && |
| 103 | (t->dev->flags & IFF_UP)) |
| 104 | return t; |
| 105 | } |
Steffen Klassert | fbe68ee | 2014-11-20 10:01:49 +0100 | [diff] [blame] | 106 | |
| 107 | memset(&any, 0, sizeof(any)); |
| 108 | hash = HASH(&any, local); |
| 109 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| 110 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
| 111 | (t->dev->flags & IFF_UP)) |
| 112 | return t; |
| 113 | } |
| 114 | |
| 115 | hash = HASH(remote, &any); |
| 116 | for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { |
| 117 | if (ipv6_addr_equal(remote, &t->parms.raddr) && |
| 118 | (t->dev->flags & IFF_UP)) |
| 119 | return t; |
| 120 | } |
| 121 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 122 | t = rcu_dereference(ip6n->tnls_wc[0]); |
| 123 | if (t && (t->dev->flags & IFF_UP)) |
| 124 | return t; |
| 125 | |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * vti6_tnl_bucket - get head of list matching given tunnel parameters |
| 131 | * @p: parameters containing tunnel end-points |
| 132 | * |
| 133 | * Description: |
| 134 | * vti6_tnl_bucket() returns the head of the list matching the |
| 135 | * &struct in6_addr entries laddr and raddr in @p. |
| 136 | * |
| 137 | * Return: head of IPv6 tunnel list |
| 138 | **/ |
| 139 | static struct ip6_tnl __rcu ** |
| 140 | vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p) |
| 141 | { |
| 142 | const struct in6_addr *remote = &p->raddr; |
| 143 | const struct in6_addr *local = &p->laddr; |
| 144 | unsigned int h = 0; |
| 145 | int prio = 0; |
| 146 | |
| 147 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { |
| 148 | prio = 1; |
| 149 | h = HASH(remote, local); |
| 150 | } |
| 151 | return &ip6n->tnls[prio][h]; |
| 152 | } |
| 153 | |
| 154 | static void |
| 155 | vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t) |
| 156 | { |
| 157 | struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms); |
| 158 | |
| 159 | rcu_assign_pointer(t->next , rtnl_dereference(*tp)); |
| 160 | rcu_assign_pointer(*tp, t); |
| 161 | } |
| 162 | |
| 163 | static void |
| 164 | vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t) |
| 165 | { |
| 166 | struct ip6_tnl __rcu **tp; |
| 167 | struct ip6_tnl *iter; |
| 168 | |
| 169 | for (tp = vti6_tnl_bucket(ip6n, &t->parms); |
| 170 | (iter = rtnl_dereference(*tp)) != NULL; |
| 171 | tp = &iter->next) { |
| 172 | if (t == iter) { |
| 173 | rcu_assign_pointer(*tp, t->next); |
| 174 | break; |
| 175 | } |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | static void vti6_dev_free(struct net_device *dev) |
| 180 | { |
| 181 | free_percpu(dev->tstats); |
| 182 | free_netdev(dev); |
| 183 | } |
| 184 | |
| 185 | static int vti6_tnl_create2(struct net_device *dev) |
| 186 | { |
| 187 | struct ip6_tnl *t = netdev_priv(dev); |
| 188 | struct net *net = dev_net(dev); |
| 189 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 190 | int err; |
| 191 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 192 | err = register_netdevice(dev); |
| 193 | if (err < 0) |
| 194 | goto out; |
| 195 | |
| 196 | strcpy(t->parms.name, dev->name); |
| 197 | dev->rtnl_link_ops = &vti6_link_ops; |
| 198 | |
| 199 | dev_hold(dev); |
| 200 | vti6_tnl_link(ip6n, t); |
| 201 | |
| 202 | return 0; |
| 203 | |
| 204 | out: |
| 205 | return err; |
| 206 | } |
| 207 | |
| 208 | static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) |
| 209 | { |
| 210 | struct net_device *dev; |
| 211 | struct ip6_tnl *t; |
| 212 | char name[IFNAMSIZ]; |
| 213 | int err; |
| 214 | |
| 215 | if (p->name[0]) |
| 216 | strlcpy(name, p->name, IFNAMSIZ); |
| 217 | else |
| 218 | sprintf(name, "ip6_vti%%d"); |
| 219 | |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 220 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 221 | if (!dev) |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 222 | goto failed; |
| 223 | |
| 224 | dev_net_set(dev, net); |
| 225 | |
| 226 | t = netdev_priv(dev); |
| 227 | t->parms = *p; |
| 228 | t->net = dev_net(dev); |
| 229 | |
| 230 | err = vti6_tnl_create2(dev); |
| 231 | if (err < 0) |
| 232 | goto failed_free; |
| 233 | |
| 234 | return t; |
| 235 | |
| 236 | failed_free: |
| 237 | vti6_dev_free(dev); |
| 238 | failed: |
| 239 | return NULL; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * vti6_locate - find or create tunnel matching given parameters |
| 244 | * @net: network namespace |
| 245 | * @p: tunnel parameters |
| 246 | * @create: != 0 if allowed to create new tunnel if no match found |
| 247 | * |
| 248 | * Description: |
| 249 | * vti6_locate() first tries to locate an existing tunnel |
| 250 | * based on @parms. If this is unsuccessful, but @create is set a new |
| 251 | * tunnel device is created and registered for use. |
| 252 | * |
| 253 | * Return: |
| 254 | * matching tunnel or NULL |
| 255 | **/ |
| 256 | static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p, |
| 257 | int create) |
| 258 | { |
| 259 | const struct in6_addr *remote = &p->raddr; |
| 260 | const struct in6_addr *local = &p->laddr; |
| 261 | struct ip6_tnl __rcu **tp; |
| 262 | struct ip6_tnl *t; |
| 263 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 264 | |
| 265 | for (tp = vti6_tnl_bucket(ip6n, p); |
| 266 | (t = rtnl_dereference(*tp)) != NULL; |
| 267 | tp = &t->next) { |
| 268 | if (ipv6_addr_equal(local, &t->parms.laddr) && |
Steffen Klassert | d814b84 | 2014-09-22 10:07:25 +0200 | [diff] [blame] | 269 | ipv6_addr_equal(remote, &t->parms.raddr)) { |
| 270 | if (create) |
| 271 | return NULL; |
| 272 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 273 | return t; |
Steffen Klassert | d814b84 | 2014-09-22 10:07:25 +0200 | [diff] [blame] | 274 | } |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 275 | } |
| 276 | if (!create) |
| 277 | return NULL; |
| 278 | return vti6_tnl_create(net, p); |
| 279 | } |
| 280 | |
| 281 | /** |
| 282 | * vti6_dev_uninit - tunnel device uninitializer |
| 283 | * @dev: the device to be destroyed |
| 284 | * |
| 285 | * Description: |
| 286 | * vti6_dev_uninit() removes tunnel from its list |
| 287 | **/ |
| 288 | static void vti6_dev_uninit(struct net_device *dev) |
| 289 | { |
| 290 | struct ip6_tnl *t = netdev_priv(dev); |
Yao Xiwei | 092a29a | 2015-04-02 17:31:17 +0200 | [diff] [blame] | 291 | struct vti6_net *ip6n = net_generic(t->net, vti6_net_id); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 292 | |
| 293 | if (dev == ip6n->fb_tnl_dev) |
| 294 | RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
| 295 | else |
| 296 | vti6_tnl_unlink(ip6n, t); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 297 | dev_put(dev); |
| 298 | } |
| 299 | |
| 300 | static int vti6_rcv(struct sk_buff *skb) |
| 301 | { |
| 302 | struct ip6_tnl *t; |
| 303 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| 304 | |
| 305 | rcu_read_lock(); |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 306 | t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 307 | if (t) { |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 308 | if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) { |
| 309 | rcu_read_unlock(); |
| 310 | goto discard; |
| 311 | } |
| 312 | |
| 313 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
| 314 | rcu_read_unlock(); |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { |
| 319 | t->dev->stats.rx_dropped++; |
| 320 | rcu_read_unlock(); |
| 321 | goto discard; |
| 322 | } |
| 323 | |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 324 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 325 | |
| 326 | rcu_read_unlock(); |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 327 | |
| 328 | return xfrm6_rcv(skb); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 329 | } |
| 330 | rcu_read_unlock(); |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 331 | return -EINVAL; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 332 | discard: |
| 333 | kfree_skb(skb); |
| 334 | return 0; |
| 335 | } |
| 336 | |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 337 | static int vti6_rcv_cb(struct sk_buff *skb, int err) |
| 338 | { |
| 339 | unsigned short family; |
| 340 | struct net_device *dev; |
| 341 | struct pcpu_sw_netstats *tstats; |
| 342 | struct xfrm_state *x; |
| 343 | struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6; |
Alexander Duyck | d55c670 | 2015-05-27 07:16:54 -0700 | [diff] [blame] | 344 | u32 orig_mark = skb->mark; |
| 345 | int ret; |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 346 | |
| 347 | if (!t) |
| 348 | return 1; |
| 349 | |
| 350 | dev = t->dev; |
| 351 | |
| 352 | if (err) { |
| 353 | dev->stats.rx_errors++; |
| 354 | dev->stats.rx_dropped++; |
| 355 | |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | x = xfrm_input_state(skb); |
| 360 | family = x->inner_mode->afinfo->family; |
| 361 | |
Alexander Duyck | d55c670 | 2015-05-27 07:16:54 -0700 | [diff] [blame] | 362 | skb->mark = be32_to_cpu(t->parms.i_key); |
| 363 | ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); |
| 364 | skb->mark = orig_mark; |
| 365 | |
| 366 | if (!ret) |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 367 | return -EPERM; |
| 368 | |
| 369 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev))); |
| 370 | skb->dev = dev; |
| 371 | |
| 372 | tstats = this_cpu_ptr(dev->tstats); |
| 373 | u64_stats_update_begin(&tstats->syncp); |
| 374 | tstats->rx_packets++; |
| 375 | tstats->rx_bytes += skb->len; |
| 376 | u64_stats_update_end(&tstats->syncp); |
| 377 | |
| 378 | return 0; |
| 379 | } |
| 380 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 381 | /** |
| 382 | * vti6_addr_conflict - compare packet addresses to tunnel's own |
| 383 | * @t: the outgoing tunnel device |
| 384 | * @hdr: IPv6 header from the incoming packet |
| 385 | * |
| 386 | * Description: |
| 387 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
| 388 | * doesn't match source of incoming packet. |
| 389 | * |
| 390 | * Return: |
| 391 | * 1 if conflict, |
| 392 | * 0 else |
| 393 | **/ |
| 394 | static inline bool |
| 395 | vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) |
| 396 | { |
| 397 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); |
| 398 | } |
| 399 | |
Steffen Klassert | 26be8e2 | 2014-03-14 07:28:09 +0100 | [diff] [blame] | 400 | static bool vti6_state_check(const struct xfrm_state *x, |
| 401 | const struct in6_addr *dst, |
| 402 | const struct in6_addr *src) |
| 403 | { |
| 404 | xfrm_address_t *daddr = (xfrm_address_t *)dst; |
| 405 | xfrm_address_t *saddr = (xfrm_address_t *)src; |
| 406 | |
| 407 | /* if there is no transform then this tunnel is not functional. |
| 408 | * Or if the xfrm is not mode tunnel. |
| 409 | */ |
| 410 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || |
| 411 | x->props.family != AF_INET6) |
| 412 | return false; |
| 413 | |
| 414 | if (ipv6_addr_any(dst)) |
| 415 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6); |
| 416 | |
| 417 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6)) |
| 418 | return false; |
| 419 | |
| 420 | return true; |
| 421 | } |
| 422 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 423 | /** |
| 424 | * vti6_xmit - send a packet |
| 425 | * @skb: the outgoing socket buffer |
| 426 | * @dev: the outgoing tunnel device |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 427 | * @fl: the flow informations for the xfrm_lookup |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 428 | **/ |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 429 | static int |
| 430 | vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 431 | { |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 432 | struct ip6_tnl *t = netdev_priv(dev); |
| 433 | struct net_device_stats *stats = &t->dev->stats; |
Steffen Klassert | 7c85258 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 434 | struct dst_entry *dst = skb_dst(skb); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 435 | struct net_device *tdev; |
Steffen Klassert | d500514 | 2014-11-05 08:02:48 +0100 | [diff] [blame] | 436 | struct xfrm_state *x; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 437 | int err = -1; |
Steffen Klassert | ccd740c | 2015-05-29 11:28:26 -0700 | [diff] [blame] | 438 | int mtu; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 439 | |
Steffen Klassert | 7c85258 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 440 | if (!dst) |
| 441 | goto tx_err_link_failure; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 442 | |
Steffen Klassert | 7c85258 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 443 | dst_hold(dst); |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 444 | dst = xfrm_lookup(t->net, dst, fl, NULL, 0); |
Steffen Klassert | 7c85258 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 445 | if (IS_ERR(dst)) { |
| 446 | err = PTR_ERR(dst); |
| 447 | dst = NULL; |
| 448 | goto tx_err_link_failure; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 449 | } |
| 450 | |
Steffen Klassert | d500514 | 2014-11-05 08:02:48 +0100 | [diff] [blame] | 451 | x = dst->xfrm; |
| 452 | if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr)) |
| 453 | goto tx_err_link_failure; |
| 454 | |
| 455 | if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr, |
| 456 | (const struct in6_addr *)&x->id.daddr)) |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 457 | goto tx_err_link_failure; |
| 458 | |
| 459 | tdev = dst->dev; |
| 460 | |
| 461 | if (tdev == dev) { |
| 462 | stats->collisions++; |
| 463 | net_warn_ratelimited("%s: Local routing loop detected!\n", |
| 464 | t->parms.name); |
| 465 | goto tx_err_dst_release; |
| 466 | } |
| 467 | |
Steffen Klassert | 7c85258 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 468 | skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); |
| 469 | skb_dst_set(skb, dst); |
| 470 | skb->dev = skb_dst(skb)->dev; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 471 | |
Steffen Klassert | ccd740c | 2015-05-29 11:28:26 -0700 | [diff] [blame] | 472 | mtu = dst_mtu(dst); |
| 473 | if (!skb->ignore_df && skb->len > mtu) { |
| 474 | skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu); |
| 475 | |
| 476 | if (skb->protocol == htons(ETH_P_IPV6)) |
| 477 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| 478 | else |
| 479 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| 480 | htonl(mtu)); |
| 481 | |
| 482 | return -EMSGSIZE; |
| 483 | } |
| 484 | |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 485 | err = dst_output(skb); |
| 486 | if (net_xmit_eval(err) == 0) { |
| 487 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); |
| 488 | |
| 489 | u64_stats_update_begin(&tstats->syncp); |
| 490 | tstats->tx_bytes += skb->len; |
| 491 | tstats->tx_packets++; |
| 492 | u64_stats_update_end(&tstats->syncp); |
| 493 | } else { |
| 494 | stats->tx_errors++; |
| 495 | stats->tx_aborted_errors++; |
| 496 | } |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 497 | |
| 498 | return 0; |
| 499 | tx_err_link_failure: |
| 500 | stats->tx_carrier_errors++; |
| 501 | dst_link_failure(skb); |
| 502 | tx_err_dst_release: |
Steffen Klassert | 7c85258 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 503 | dst_release(dst); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 504 | return err; |
| 505 | } |
| 506 | |
| 507 | static netdev_tx_t |
| 508 | vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) |
| 509 | { |
| 510 | struct ip6_tnl *t = netdev_priv(dev); |
| 511 | struct net_device_stats *stats = &t->dev->stats; |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 512 | struct ipv6hdr *ipv6h; |
| 513 | struct flowi fl; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 514 | int ret; |
| 515 | |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 516 | memset(&fl, 0, sizeof(fl)); |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 517 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 518 | switch (skb->protocol) { |
| 519 | case htons(ETH_P_IPV6): |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 520 | ipv6h = ipv6_hdr(skb); |
| 521 | |
| 522 | if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || |
Steffen Klassert | d500514 | 2014-11-05 08:02:48 +0100 | [diff] [blame] | 523 | vti6_addr_conflict(t, ipv6h)) |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 524 | goto tx_err; |
| 525 | |
| 526 | xfrm_decode_session(skb, &fl, AF_INET6); |
| 527 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
| 528 | break; |
| 529 | case htons(ETH_P_IP): |
| 530 | xfrm_decode_session(skb, &fl, AF_INET); |
| 531 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 532 | break; |
| 533 | default: |
| 534 | goto tx_err; |
| 535 | } |
| 536 | |
Alexander Duyck | cd5279c | 2015-05-27 07:16:43 -0700 | [diff] [blame] | 537 | /* override mark with tunnel output key */ |
| 538 | fl.flowi_mark = be32_to_cpu(t->parms.o_key); |
| 539 | |
Steffen Klassert | 22e1b23 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 540 | ret = vti6_xmit(skb, dev, &fl); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 541 | if (ret < 0) |
| 542 | goto tx_err; |
| 543 | |
| 544 | return NETDEV_TX_OK; |
| 545 | |
| 546 | tx_err: |
| 547 | stats->tx_errors++; |
| 548 | stats->tx_dropped++; |
| 549 | kfree_skb(skb); |
| 550 | return NETDEV_TX_OK; |
| 551 | } |
| 552 | |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 553 | static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 554 | u8 type, u8 code, int offset, __be32 info) |
| 555 | { |
| 556 | __be32 spi; |
Steffen Klassert | 6d004d6 | 2014-05-12 09:09:26 +0200 | [diff] [blame] | 557 | __u32 mark; |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 558 | struct xfrm_state *x; |
| 559 | struct ip6_tnl *t; |
| 560 | struct ip_esp_hdr *esph; |
| 561 | struct ip_auth_hdr *ah; |
| 562 | struct ip_comp_hdr *ipch; |
| 563 | struct net *net = dev_net(skb->dev); |
| 564 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
| 565 | int protocol = iph->nexthdr; |
| 566 | |
| 567 | t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr); |
| 568 | if (!t) |
| 569 | return -1; |
| 570 | |
Steffen Klassert | 6d004d6 | 2014-05-12 09:09:26 +0200 | [diff] [blame] | 571 | mark = be32_to_cpu(t->parms.o_key); |
| 572 | |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 573 | switch (protocol) { |
| 574 | case IPPROTO_ESP: |
| 575 | esph = (struct ip_esp_hdr *)(skb->data + offset); |
| 576 | spi = esph->spi; |
| 577 | break; |
| 578 | case IPPROTO_AH: |
| 579 | ah = (struct ip_auth_hdr *)(skb->data + offset); |
| 580 | spi = ah->spi; |
| 581 | break; |
| 582 | case IPPROTO_COMP: |
| 583 | ipch = (struct ip_comp_hdr *)(skb->data + offset); |
| 584 | spi = htonl(ntohs(ipch->cpi)); |
| 585 | break; |
| 586 | default: |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | if (type != ICMPV6_PKT_TOOBIG && |
| 591 | type != NDISC_REDIRECT) |
| 592 | return 0; |
| 593 | |
Steffen Klassert | 6d004d6 | 2014-05-12 09:09:26 +0200 | [diff] [blame] | 594 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 595 | spi, protocol, AF_INET6); |
| 596 | if (!x) |
| 597 | return 0; |
| 598 | |
| 599 | if (type == NDISC_REDIRECT) |
| 600 | ip6_redirect(skb, net, skb->dev->ifindex, 0); |
| 601 | else |
| 602 | ip6_update_pmtu(skb, net, info, 0, 0); |
| 603 | xfrm_state_put(x); |
| 604 | |
| 605 | return 0; |
| 606 | } |
| 607 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 608 | static void vti6_link_config(struct ip6_tnl *t) |
| 609 | { |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 610 | struct net_device *dev = t->dev; |
| 611 | struct __ip6_tnl_parm *p = &t->parms; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 612 | |
| 613 | memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); |
| 614 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); |
| 615 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 616 | p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV | |
| 617 | IP6_TNL_F_CAP_PER_PACKET); |
| 618 | p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); |
| 619 | |
| 620 | if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV) |
| 621 | dev->flags |= IFF_POINTOPOINT; |
| 622 | else |
| 623 | dev->flags &= ~IFF_POINTOPOINT; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | /** |
| 627 | * vti6_tnl_change - update the tunnel parameters |
| 628 | * @t: tunnel to be changed |
| 629 | * @p: tunnel configuration parameters |
| 630 | * |
| 631 | * Description: |
| 632 | * vti6_tnl_change() updates the tunnel parameters |
| 633 | **/ |
| 634 | static int |
| 635 | vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) |
| 636 | { |
| 637 | t->parms.laddr = p->laddr; |
| 638 | t->parms.raddr = p->raddr; |
| 639 | t->parms.link = p->link; |
| 640 | t->parms.i_key = p->i_key; |
| 641 | t->parms.o_key = p->o_key; |
| 642 | t->parms.proto = p->proto; |
| 643 | ip6_tnl_dst_reset(t); |
| 644 | vti6_link_config(t); |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) |
| 649 | { |
| 650 | struct net *net = dev_net(t->dev); |
| 651 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 652 | int err; |
| 653 | |
| 654 | vti6_tnl_unlink(ip6n, t); |
| 655 | synchronize_net(); |
| 656 | err = vti6_tnl_change(t, p); |
| 657 | vti6_tnl_link(ip6n, t); |
| 658 | netdev_state_change(t->dev); |
| 659 | return err; |
| 660 | } |
| 661 | |
| 662 | static void |
| 663 | vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u) |
| 664 | { |
| 665 | p->laddr = u->laddr; |
| 666 | p->raddr = u->raddr; |
| 667 | p->link = u->link; |
| 668 | p->i_key = u->i_key; |
| 669 | p->o_key = u->o_key; |
| 670 | p->proto = u->proto; |
| 671 | |
| 672 | memcpy(p->name, u->name, sizeof(u->name)); |
| 673 | } |
| 674 | |
| 675 | static void |
| 676 | vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p) |
| 677 | { |
| 678 | u->laddr = p->laddr; |
| 679 | u->raddr = p->raddr; |
| 680 | u->link = p->link; |
| 681 | u->i_key = p->i_key; |
| 682 | u->o_key = p->o_key; |
| 683 | u->proto = p->proto; |
| 684 | |
| 685 | memcpy(u->name, p->name, sizeof(u->name)); |
| 686 | } |
| 687 | |
| 688 | /** |
| 689 | * vti6_tnl_ioctl - configure vti6 tunnels from userspace |
| 690 | * @dev: virtual device associated with tunnel |
| 691 | * @ifr: parameters passed from userspace |
| 692 | * @cmd: command to be performed |
| 693 | * |
| 694 | * Description: |
| 695 | * vti6_ioctl() is used for managing vti6 tunnels |
| 696 | * from userspace. |
| 697 | * |
| 698 | * The possible commands are the following: |
| 699 | * %SIOCGETTUNNEL: get tunnel parameters for device |
| 700 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters |
| 701 | * %SIOCCHGTUNNEL: change tunnel parameters to those given |
| 702 | * %SIOCDELTUNNEL: delete tunnel |
| 703 | * |
| 704 | * The fallback device "ip6_vti0", created during module |
| 705 | * initialization, can be used for creating other tunnel devices. |
| 706 | * |
| 707 | * Return: |
| 708 | * 0 on success, |
| 709 | * %-EFAULT if unable to copy data to or from userspace, |
| 710 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set |
| 711 | * %-EINVAL if passed tunnel parameters are invalid, |
| 712 | * %-EEXIST if changing a tunnel's parameters would cause a conflict |
| 713 | * %-ENODEV if attempting to change or delete a nonexisting device |
| 714 | **/ |
| 715 | static int |
| 716 | vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 717 | { |
| 718 | int err = 0; |
| 719 | struct ip6_tnl_parm2 p; |
| 720 | struct __ip6_tnl_parm p1; |
| 721 | struct ip6_tnl *t = NULL; |
| 722 | struct net *net = dev_net(dev); |
| 723 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 724 | |
| 725 | switch (cmd) { |
| 726 | case SIOCGETTUNNEL: |
| 727 | if (dev == ip6n->fb_tnl_dev) { |
| 728 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
| 729 | err = -EFAULT; |
| 730 | break; |
| 731 | } |
| 732 | vti6_parm_from_user(&p1, &p); |
| 733 | t = vti6_locate(net, &p1, 0); |
| 734 | } else { |
| 735 | memset(&p, 0, sizeof(p)); |
| 736 | } |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 737 | if (!t) |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 738 | t = netdev_priv(dev); |
| 739 | vti6_parm_to_user(&p, &t->parms); |
| 740 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 741 | err = -EFAULT; |
| 742 | break; |
| 743 | case SIOCADDTUNNEL: |
| 744 | case SIOCCHGTUNNEL: |
| 745 | err = -EPERM; |
| 746 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 747 | break; |
| 748 | err = -EFAULT; |
| 749 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 750 | break; |
| 751 | err = -EINVAL; |
| 752 | if (p.proto != IPPROTO_IPV6 && p.proto != 0) |
| 753 | break; |
| 754 | vti6_parm_from_user(&p1, &p); |
| 755 | t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL); |
| 756 | if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 757 | if (t) { |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 758 | if (t->dev != dev) { |
| 759 | err = -EEXIST; |
| 760 | break; |
| 761 | } |
| 762 | } else |
| 763 | t = netdev_priv(dev); |
| 764 | |
| 765 | err = vti6_update(t, &p1); |
| 766 | } |
| 767 | if (t) { |
| 768 | err = 0; |
| 769 | vti6_parm_to_user(&p, &t->parms); |
| 770 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 771 | err = -EFAULT; |
| 772 | |
| 773 | } else |
| 774 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
| 775 | break; |
| 776 | case SIOCDELTUNNEL: |
| 777 | err = -EPERM; |
| 778 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 779 | break; |
| 780 | |
| 781 | if (dev == ip6n->fb_tnl_dev) { |
| 782 | err = -EFAULT; |
| 783 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 784 | break; |
| 785 | err = -ENOENT; |
| 786 | vti6_parm_from_user(&p1, &p); |
| 787 | t = vti6_locate(net, &p1, 0); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 788 | if (!t) |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 789 | break; |
| 790 | err = -EPERM; |
| 791 | if (t->dev == ip6n->fb_tnl_dev) |
| 792 | break; |
| 793 | dev = t->dev; |
| 794 | } |
| 795 | err = 0; |
| 796 | unregister_netdevice(dev); |
| 797 | break; |
| 798 | default: |
| 799 | err = -EINVAL; |
| 800 | } |
| 801 | return err; |
| 802 | } |
| 803 | |
| 804 | /** |
| 805 | * vti6_tnl_change_mtu - change mtu manually for tunnel device |
| 806 | * @dev: virtual device associated with tunnel |
| 807 | * @new_mtu: the new mtu |
| 808 | * |
| 809 | * Return: |
| 810 | * 0 on success, |
| 811 | * %-EINVAL if mtu too small |
| 812 | **/ |
| 813 | static int vti6_change_mtu(struct net_device *dev, int new_mtu) |
| 814 | { |
| 815 | if (new_mtu < IPV6_MIN_MTU) |
| 816 | return -EINVAL; |
| 817 | |
| 818 | dev->mtu = new_mtu; |
| 819 | return 0; |
| 820 | } |
| 821 | |
| 822 | static const struct net_device_ops vti6_netdev_ops = { |
Steffen Klassert | 16a0231 | 2014-11-03 09:19:28 +0100 | [diff] [blame] | 823 | .ndo_init = vti6_dev_init, |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 824 | .ndo_uninit = vti6_dev_uninit, |
| 825 | .ndo_start_xmit = vti6_tnl_xmit, |
| 826 | .ndo_do_ioctl = vti6_ioctl, |
| 827 | .ndo_change_mtu = vti6_change_mtu, |
Li RongQing | 469bdce | 2014-01-02 14:24:36 +0800 | [diff] [blame] | 828 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
Nicolas Dichtel | ecf2c06 | 2015-04-02 17:07:01 +0200 | [diff] [blame] | 829 | .ndo_get_iflink = ip6_tnl_get_iflink, |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 830 | }; |
| 831 | |
| 832 | /** |
| 833 | * vti6_dev_setup - setup virtual tunnel device |
| 834 | * @dev: virtual device associated with tunnel |
| 835 | * |
| 836 | * Description: |
| 837 | * Initialize function pointers and device parameters |
| 838 | **/ |
| 839 | static void vti6_dev_setup(struct net_device *dev) |
| 840 | { |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 841 | dev->netdev_ops = &vti6_netdev_ops; |
| 842 | dev->destructor = vti6_dev_free; |
| 843 | |
| 844 | dev->type = ARPHRD_TUNNEL6; |
| 845 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); |
| 846 | dev->mtu = ETH_DATA_LEN; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 847 | dev->flags |= IFF_NOARP; |
| 848 | dev->addr_len = sizeof(struct in6_addr); |
Eric Dumazet | 0287587 | 2014-10-05 18:38:35 -0700 | [diff] [blame] | 849 | netif_keep_dst(dev); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | /** |
| 853 | * vti6_dev_init_gen - general initializer for all tunnel devices |
| 854 | * @dev: virtual device associated with tunnel |
| 855 | **/ |
| 856 | static inline int vti6_dev_init_gen(struct net_device *dev) |
| 857 | { |
| 858 | struct ip6_tnl *t = netdev_priv(dev); |
| 859 | |
| 860 | t->dev = dev; |
| 861 | t->net = dev_net(dev); |
WANG Cong | 1c213bd | 2014-02-13 11:46:28 -0800 | [diff] [blame] | 862 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 863 | if (!dev->tstats) |
| 864 | return -ENOMEM; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 865 | return 0; |
| 866 | } |
| 867 | |
| 868 | /** |
| 869 | * vti6_dev_init - initializer for all non fallback tunnel devices |
| 870 | * @dev: virtual device associated with tunnel |
| 871 | **/ |
| 872 | static int vti6_dev_init(struct net_device *dev) |
| 873 | { |
| 874 | struct ip6_tnl *t = netdev_priv(dev); |
| 875 | int err = vti6_dev_init_gen(dev); |
| 876 | |
| 877 | if (err) |
| 878 | return err; |
| 879 | vti6_link_config(t); |
| 880 | return 0; |
| 881 | } |
| 882 | |
| 883 | /** |
| 884 | * vti6_fb_tnl_dev_init - initializer for fallback tunnel device |
| 885 | * @dev: fallback device |
| 886 | * |
| 887 | * Return: 0 |
| 888 | **/ |
| 889 | static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev) |
| 890 | { |
| 891 | struct ip6_tnl *t = netdev_priv(dev); |
| 892 | struct net *net = dev_net(dev); |
| 893 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 894 | |
| 895 | t->parms.proto = IPPROTO_IPV6; |
| 896 | dev_hold(dev); |
| 897 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 898 | rcu_assign_pointer(ip6n->tnls_wc[0], t); |
| 899 | return 0; |
| 900 | } |
| 901 | |
| 902 | static int vti6_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 903 | { |
| 904 | return 0; |
| 905 | } |
| 906 | |
| 907 | static void vti6_netlink_parms(struct nlattr *data[], |
| 908 | struct __ip6_tnl_parm *parms) |
| 909 | { |
| 910 | memset(parms, 0, sizeof(*parms)); |
| 911 | |
| 912 | if (!data) |
| 913 | return; |
| 914 | |
| 915 | if (data[IFLA_VTI_LINK]) |
| 916 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); |
| 917 | |
| 918 | if (data[IFLA_VTI_LOCAL]) |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 919 | parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 920 | |
| 921 | if (data[IFLA_VTI_REMOTE]) |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 922 | parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 923 | |
| 924 | if (data[IFLA_VTI_IKEY]) |
| 925 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); |
| 926 | |
| 927 | if (data[IFLA_VTI_OKEY]) |
| 928 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); |
| 929 | } |
| 930 | |
| 931 | static int vti6_newlink(struct net *src_net, struct net_device *dev, |
| 932 | struct nlattr *tb[], struct nlattr *data[]) |
| 933 | { |
| 934 | struct net *net = dev_net(dev); |
| 935 | struct ip6_tnl *nt; |
| 936 | |
| 937 | nt = netdev_priv(dev); |
| 938 | vti6_netlink_parms(data, &nt->parms); |
| 939 | |
| 940 | nt->parms.proto = IPPROTO_IPV6; |
| 941 | |
| 942 | if (vti6_locate(net, &nt->parms, 0)) |
| 943 | return -EEXIST; |
| 944 | |
| 945 | return vti6_tnl_create2(dev); |
| 946 | } |
| 947 | |
lucien | 20ea60c | 2014-11-23 15:04:11 +0800 | [diff] [blame] | 948 | static void vti6_dellink(struct net_device *dev, struct list_head *head) |
| 949 | { |
| 950 | struct net *net = dev_net(dev); |
| 951 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 952 | |
| 953 | if (dev != ip6n->fb_tnl_dev) |
| 954 | unregister_netdevice_queue(dev, head); |
| 955 | } |
| 956 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 957 | static int vti6_changelink(struct net_device *dev, struct nlattr *tb[], |
| 958 | struct nlattr *data[]) |
| 959 | { |
| 960 | struct ip6_tnl *t; |
| 961 | struct __ip6_tnl_parm p; |
| 962 | struct net *net = dev_net(dev); |
| 963 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 964 | |
| 965 | if (dev == ip6n->fb_tnl_dev) |
| 966 | return -EINVAL; |
| 967 | |
| 968 | vti6_netlink_parms(data, &p); |
| 969 | |
| 970 | t = vti6_locate(net, &p, 0); |
| 971 | |
| 972 | if (t) { |
| 973 | if (t->dev != dev) |
| 974 | return -EEXIST; |
| 975 | } else |
| 976 | t = netdev_priv(dev); |
| 977 | |
| 978 | return vti6_update(t, &p); |
| 979 | } |
| 980 | |
| 981 | static size_t vti6_get_size(const struct net_device *dev) |
| 982 | { |
| 983 | return |
| 984 | /* IFLA_VTI_LINK */ |
| 985 | nla_total_size(4) + |
| 986 | /* IFLA_VTI_LOCAL */ |
| 987 | nla_total_size(sizeof(struct in6_addr)) + |
| 988 | /* IFLA_VTI_REMOTE */ |
| 989 | nla_total_size(sizeof(struct in6_addr)) + |
| 990 | /* IFLA_VTI_IKEY */ |
| 991 | nla_total_size(4) + |
| 992 | /* IFLA_VTI_OKEY */ |
| 993 | nla_total_size(4) + |
| 994 | 0; |
| 995 | } |
| 996 | |
| 997 | static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 998 | { |
| 999 | struct ip6_tnl *tunnel = netdev_priv(dev); |
| 1000 | struct __ip6_tnl_parm *parm = &tunnel->parms; |
| 1001 | |
| 1002 | if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) || |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 1003 | nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) || |
| 1004 | nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) || |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1005 | nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || |
| 1006 | nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key)) |
| 1007 | goto nla_put_failure; |
| 1008 | return 0; |
| 1009 | |
| 1010 | nla_put_failure: |
| 1011 | return -EMSGSIZE; |
| 1012 | } |
| 1013 | |
| 1014 | static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { |
| 1015 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, |
| 1016 | [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) }, |
| 1017 | [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, |
| 1018 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, |
| 1019 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, |
| 1020 | }; |
| 1021 | |
| 1022 | static struct rtnl_link_ops vti6_link_ops __read_mostly = { |
| 1023 | .kind = "vti6", |
| 1024 | .maxtype = IFLA_VTI_MAX, |
| 1025 | .policy = vti6_policy, |
| 1026 | .priv_size = sizeof(struct ip6_tnl), |
| 1027 | .setup = vti6_dev_setup, |
| 1028 | .validate = vti6_validate, |
| 1029 | .newlink = vti6_newlink, |
lucien | 20ea60c | 2014-11-23 15:04:11 +0800 | [diff] [blame] | 1030 | .dellink = vti6_dellink, |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1031 | .changelink = vti6_changelink, |
| 1032 | .get_size = vti6_get_size, |
| 1033 | .fill_info = vti6_fill_info, |
Nicolas Dichtel | 1728d4f | 2015-01-15 15:11:17 +0100 | [diff] [blame] | 1034 | .get_link_net = ip6_tnl_get_link_net, |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1035 | }; |
| 1036 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1037 | static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n) |
| 1038 | { |
| 1039 | int h; |
| 1040 | struct ip6_tnl *t; |
| 1041 | LIST_HEAD(list); |
| 1042 | |
| 1043 | for (h = 0; h < HASH_SIZE; h++) { |
| 1044 | t = rtnl_dereference(ip6n->tnls_r_l[h]); |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 1045 | while (t) { |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1046 | unregister_netdevice_queue(t->dev, &list); |
| 1047 | t = rtnl_dereference(t->next); |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | t = rtnl_dereference(ip6n->tnls_wc[0]); |
| 1052 | unregister_netdevice_queue(t->dev, &list); |
| 1053 | unregister_netdevice_many(&list); |
| 1054 | } |
| 1055 | |
| 1056 | static int __net_init vti6_init_net(struct net *net) |
| 1057 | { |
| 1058 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 1059 | struct ip6_tnl *t = NULL; |
| 1060 | int err; |
| 1061 | |
| 1062 | ip6n->tnls[0] = ip6n->tnls_wc; |
| 1063 | ip6n->tnls[1] = ip6n->tnls_r_l; |
| 1064 | |
| 1065 | err = -ENOMEM; |
| 1066 | ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0", |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 1067 | NET_NAME_UNKNOWN, vti6_dev_setup); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1068 | |
| 1069 | if (!ip6n->fb_tnl_dev) |
| 1070 | goto err_alloc_dev; |
| 1071 | dev_net_set(ip6n->fb_tnl_dev, net); |
lucien | 20ea60c | 2014-11-23 15:04:11 +0800 | [diff] [blame] | 1072 | ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1073 | |
| 1074 | err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev); |
| 1075 | if (err < 0) |
| 1076 | goto err_register; |
| 1077 | |
| 1078 | err = register_netdev(ip6n->fb_tnl_dev); |
| 1079 | if (err < 0) |
| 1080 | goto err_register; |
| 1081 | |
| 1082 | t = netdev_priv(ip6n->fb_tnl_dev); |
| 1083 | |
| 1084 | strcpy(t->parms.name, ip6n->fb_tnl_dev->name); |
| 1085 | return 0; |
| 1086 | |
| 1087 | err_register: |
| 1088 | vti6_dev_free(ip6n->fb_tnl_dev); |
| 1089 | err_alloc_dev: |
| 1090 | return err; |
| 1091 | } |
| 1092 | |
| 1093 | static void __net_exit vti6_exit_net(struct net *net) |
| 1094 | { |
| 1095 | struct vti6_net *ip6n = net_generic(net, vti6_net_id); |
| 1096 | |
| 1097 | rtnl_lock(); |
| 1098 | vti6_destroy_tunnels(ip6n); |
| 1099 | rtnl_unlock(); |
| 1100 | } |
| 1101 | |
| 1102 | static struct pernet_operations vti6_net_ops = { |
| 1103 | .init = vti6_init_net, |
| 1104 | .exit = vti6_exit_net, |
| 1105 | .id = &vti6_net_id, |
| 1106 | .size = sizeof(struct vti6_net), |
| 1107 | }; |
| 1108 | |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1109 | static struct xfrm6_protocol vti_esp6_protocol __read_mostly = { |
| 1110 | .handler = vti6_rcv, |
| 1111 | .cb_handler = vti6_rcv_cb, |
| 1112 | .err_handler = vti6_err, |
| 1113 | .priority = 100, |
| 1114 | }; |
| 1115 | |
| 1116 | static struct xfrm6_protocol vti_ah6_protocol __read_mostly = { |
| 1117 | .handler = vti6_rcv, |
| 1118 | .cb_handler = vti6_rcv_cb, |
| 1119 | .err_handler = vti6_err, |
| 1120 | .priority = 100, |
| 1121 | }; |
| 1122 | |
| 1123 | static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { |
| 1124 | .handler = vti6_rcv, |
| 1125 | .cb_handler = vti6_rcv_cb, |
| 1126 | .err_handler = vti6_err, |
| 1127 | .priority = 100, |
| 1128 | }; |
| 1129 | |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1130 | /** |
| 1131 | * vti6_tunnel_init - register protocol and reserve needed resources |
| 1132 | * |
| 1133 | * Return: 0 on success |
| 1134 | **/ |
| 1135 | static int __init vti6_tunnel_init(void) |
| 1136 | { |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1137 | const char *msg; |
| 1138 | int err; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1139 | |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1140 | msg = "tunnel device"; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1141 | err = register_pernet_device(&vti6_net_ops); |
| 1142 | if (err < 0) |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1143 | goto pernet_dev_failed; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1144 | |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1145 | msg = "tunnel protocols"; |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1146 | err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1147 | if (err < 0) |
| 1148 | goto xfrm_proto_esp_failed; |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1149 | err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1150 | if (err < 0) |
| 1151 | goto xfrm_proto_ah_failed; |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1152 | err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1153 | if (err < 0) |
| 1154 | goto xfrm_proto_comp_failed; |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1155 | |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1156 | msg = "netlink interface"; |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1157 | err = rtnl_link_register(&vti6_link_ops); |
| 1158 | if (err < 0) |
| 1159 | goto rtnl_link_failed; |
| 1160 | |
| 1161 | return 0; |
| 1162 | |
| 1163 | rtnl_link_failed: |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1164 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1165 | xfrm_proto_comp_failed: |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1166 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1167 | xfrm_proto_ah_failed: |
Steffen Klassert | fa9ad96 | 2014-03-14 07:28:08 +0100 | [diff] [blame] | 1168 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1169 | xfrm_proto_esp_failed: |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1170 | unregister_pernet_device(&vti6_net_ops); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1171 | pernet_dev_failed: |
| 1172 | pr_err("vti6 init: failed to register %s\n", msg); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1173 | return err; |
| 1174 | } |
| 1175 | |
| 1176 | /** |
| 1177 | * vti6_tunnel_cleanup - free resources and unregister protocol |
| 1178 | **/ |
| 1179 | static void __exit vti6_tunnel_cleanup(void) |
| 1180 | { |
| 1181 | rtnl_link_unregister(&vti6_link_ops); |
Mathias Krause | e59d82f | 2014-05-09 23:43:41 +0200 | [diff] [blame] | 1182 | xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); |
| 1183 | xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); |
| 1184 | xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); |
Steffen Klassert | ed1efb2 | 2013-08-19 08:07:34 +0200 | [diff] [blame] | 1185 | unregister_pernet_device(&vti6_net_ops); |
| 1186 | } |
| 1187 | |
| 1188 | module_init(vti6_tunnel_init); |
| 1189 | module_exit(vti6_tunnel_cleanup); |
| 1190 | MODULE_LICENSE("GPL"); |
| 1191 | MODULE_ALIAS_RTNL_LINK("vti6"); |
| 1192 | MODULE_ALIAS_NETDEV("ip6_vti0"); |
| 1193 | MODULE_AUTHOR("Steffen Klassert"); |
| 1194 | MODULE_DESCRIPTION("IPv6 virtual tunnel interface"); |