1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * GRE over IPv6 protocol decoder. |
4 | * |
5 | * Authors: Dmitry Kozlov (xeb@mail.ru) |
6 | */ |
7 | |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | |
10 | #include <linux/capability.h> |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/uaccess.h> |
16 | #include <linux/skbuff.h> |
17 | #include <linux/netdevice.h> |
18 | #include <linux/in.h> |
19 | #include <linux/tcp.h> |
20 | #include <linux/udp.h> |
21 | #include <linux/if_arp.h> |
22 | #include <linux/init.h> |
23 | #include <linux/in6.h> |
24 | #include <linux/inetdevice.h> |
25 | #include <linux/igmp.h> |
26 | #include <linux/netfilter_ipv4.h> |
27 | #include <linux/etherdevice.h> |
28 | #include <linux/if_ether.h> |
29 | #include <linux/hash.h> |
30 | #include <linux/if_tunnel.h> |
31 | #include <linux/ip6_tunnel.h> |
32 | |
33 | #include <net/sock.h> |
34 | #include <net/ip.h> |
35 | #include <net/ip_tunnels.h> |
36 | #include <net/icmp.h> |
37 | #include <net/protocol.h> |
38 | #include <net/addrconf.h> |
39 | #include <net/arp.h> |
40 | #include <net/checksum.h> |
41 | #include <net/dsfield.h> |
42 | #include <net/inet_ecn.h> |
43 | #include <net/xfrm.h> |
44 | #include <net/net_namespace.h> |
45 | #include <net/netns/generic.h> |
46 | #include <net/rtnetlink.h> |
47 | |
48 | #include <net/ipv6.h> |
49 | #include <net/ip6_fib.h> |
50 | #include <net/ip6_route.h> |
51 | #include <net/ip6_tunnel.h> |
52 | #include <net/gre.h> |
53 | #include <net/erspan.h> |
54 | #include <net/dst_metadata.h> |
55 | |
56 | |
57 | static bool log_ecn_error = true; |
58 | module_param(log_ecn_error, bool, 0644); |
59 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN" ); |
60 | |
61 | #define IP6_GRE_HASH_SIZE_SHIFT 5 |
62 | #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) |
63 | |
64 | static unsigned int ip6gre_net_id __read_mostly; |
65 | struct ip6gre_net { |
66 | struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; |
67 | |
68 | struct ip6_tnl __rcu *collect_md_tun; |
69 | struct ip6_tnl __rcu *collect_md_tun_erspan; |
70 | struct net_device *fb_tunnel_dev; |
71 | }; |
72 | |
73 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly; |
74 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; |
75 | static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; |
76 | static int ip6gre_tunnel_init(struct net_device *dev); |
77 | static void ip6gre_tunnel_setup(struct net_device *dev); |
78 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); |
79 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); |
80 | static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); |
81 | |
82 | /* Tunnel hash table */ |
83 | |
84 | /* |
85 | 4 hash tables: |
86 | |
87 | 3: (remote,local) |
88 | 2: (remote,*) |
89 | 1: (*,local) |
90 | 0: (*,*) |
91 | |
92 | We require exact key match i.e. if a key is present in packet |
93 | it will match only tunnel with the same key; if it is not present, |
94 | it will match only keyless tunnel. |
95 | |
96 | All keysless packets, if not matched configured keyless tunnels |
97 | will match fallback tunnel. |
98 | */ |
99 | |
100 | #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) |
101 | static u32 HASH_ADDR(const struct in6_addr *addr) |
102 | { |
103 | u32 hash = ipv6_addr_hash(a: addr); |
104 | |
105 | return hash_32(val: hash, IP6_GRE_HASH_SIZE_SHIFT); |
106 | } |
107 | |
108 | #define tunnels_r_l tunnels[3] |
109 | #define tunnels_r tunnels[2] |
110 | #define tunnels_l tunnels[1] |
111 | #define tunnels_wc tunnels[0] |
112 | |
113 | /* Given src, dst and key, find appropriate for input tunnel. */ |
114 | |
115 | static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, |
116 | const struct in6_addr *remote, const struct in6_addr *local, |
117 | __be32 key, __be16 gre_proto) |
118 | { |
119 | struct net *net = dev_net(dev); |
120 | int link = dev->ifindex; |
121 | unsigned int h0 = HASH_ADDR(addr: remote); |
122 | unsigned int h1 = HASH_KEY(key); |
123 | struct ip6_tnl *t, *cand = NULL; |
124 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
125 | int dev_type = (gre_proto == htons(ETH_P_TEB) || |
126 | gre_proto == htons(ETH_P_ERSPAN) || |
127 | gre_proto == htons(ETH_P_ERSPAN2)) ? |
128 | ARPHRD_ETHER : ARPHRD_IP6GRE; |
129 | int score, cand_score = 4; |
130 | struct net_device *ndev; |
131 | |
132 | for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { |
133 | if (!ipv6_addr_equal(a1: local, a2: &t->parms.laddr) || |
134 | !ipv6_addr_equal(a1: remote, a2: &t->parms.raddr) || |
135 | key != t->parms.i_key || |
136 | !(t->dev->flags & IFF_UP)) |
137 | continue; |
138 | |
139 | if (t->dev->type != ARPHRD_IP6GRE && |
140 | t->dev->type != dev_type) |
141 | continue; |
142 | |
143 | score = 0; |
144 | if (t->parms.link != link) |
145 | score |= 1; |
146 | if (t->dev->type != dev_type) |
147 | score |= 2; |
148 | if (score == 0) |
149 | return t; |
150 | |
151 | if (score < cand_score) { |
152 | cand = t; |
153 | cand_score = score; |
154 | } |
155 | } |
156 | |
157 | for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { |
158 | if (!ipv6_addr_equal(a1: remote, a2: &t->parms.raddr) || |
159 | key != t->parms.i_key || |
160 | !(t->dev->flags & IFF_UP)) |
161 | continue; |
162 | |
163 | if (t->dev->type != ARPHRD_IP6GRE && |
164 | t->dev->type != dev_type) |
165 | continue; |
166 | |
167 | score = 0; |
168 | if (t->parms.link != link) |
169 | score |= 1; |
170 | if (t->dev->type != dev_type) |
171 | score |= 2; |
172 | if (score == 0) |
173 | return t; |
174 | |
175 | if (score < cand_score) { |
176 | cand = t; |
177 | cand_score = score; |
178 | } |
179 | } |
180 | |
181 | for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { |
182 | if ((!ipv6_addr_equal(a1: local, a2: &t->parms.laddr) && |
183 | (!ipv6_addr_equal(a1: local, a2: &t->parms.raddr) || |
184 | !ipv6_addr_is_multicast(addr: local))) || |
185 | key != t->parms.i_key || |
186 | !(t->dev->flags & IFF_UP)) |
187 | continue; |
188 | |
189 | if (t->dev->type != ARPHRD_IP6GRE && |
190 | t->dev->type != dev_type) |
191 | continue; |
192 | |
193 | score = 0; |
194 | if (t->parms.link != link) |
195 | score |= 1; |
196 | if (t->dev->type != dev_type) |
197 | score |= 2; |
198 | if (score == 0) |
199 | return t; |
200 | |
201 | if (score < cand_score) { |
202 | cand = t; |
203 | cand_score = score; |
204 | } |
205 | } |
206 | |
207 | for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { |
208 | if (t->parms.i_key != key || |
209 | !(t->dev->flags & IFF_UP)) |
210 | continue; |
211 | |
212 | if (t->dev->type != ARPHRD_IP6GRE && |
213 | t->dev->type != dev_type) |
214 | continue; |
215 | |
216 | score = 0; |
217 | if (t->parms.link != link) |
218 | score |= 1; |
219 | if (t->dev->type != dev_type) |
220 | score |= 2; |
221 | if (score == 0) |
222 | return t; |
223 | |
224 | if (score < cand_score) { |
225 | cand = t; |
226 | cand_score = score; |
227 | } |
228 | } |
229 | |
230 | if (cand) |
231 | return cand; |
232 | |
233 | if (gre_proto == htons(ETH_P_ERSPAN) || |
234 | gre_proto == htons(ETH_P_ERSPAN2)) |
235 | t = rcu_dereference(ign->collect_md_tun_erspan); |
236 | else |
237 | t = rcu_dereference(ign->collect_md_tun); |
238 | |
239 | if (t && t->dev->flags & IFF_UP) |
240 | return t; |
241 | |
242 | ndev = READ_ONCE(ign->fb_tunnel_dev); |
243 | if (ndev && ndev->flags & IFF_UP) |
244 | return netdev_priv(dev: ndev); |
245 | |
246 | return NULL; |
247 | } |
248 | |
249 | static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, |
250 | const struct __ip6_tnl_parm *p) |
251 | { |
252 | const struct in6_addr *remote = &p->raddr; |
253 | const struct in6_addr *local = &p->laddr; |
254 | unsigned int h = HASH_KEY(p->i_key); |
255 | int prio = 0; |
256 | |
257 | if (!ipv6_addr_any(a: local)) |
258 | prio |= 1; |
259 | if (!ipv6_addr_any(a: remote) && !ipv6_addr_is_multicast(addr: remote)) { |
260 | prio |= 2; |
261 | h ^= HASH_ADDR(addr: remote); |
262 | } |
263 | |
264 | return &ign->tunnels[prio][h]; |
265 | } |
266 | |
267 | static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) |
268 | { |
269 | if (t->parms.collect_md) |
270 | rcu_assign_pointer(ign->collect_md_tun, t); |
271 | } |
272 | |
273 | static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) |
274 | { |
275 | if (t->parms.collect_md) |
276 | rcu_assign_pointer(ign->collect_md_tun_erspan, t); |
277 | } |
278 | |
279 | static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) |
280 | { |
281 | if (t->parms.collect_md) |
282 | rcu_assign_pointer(ign->collect_md_tun, NULL); |
283 | } |
284 | |
285 | static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, |
286 | struct ip6_tnl *t) |
287 | { |
288 | if (t->parms.collect_md) |
289 | rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); |
290 | } |
291 | |
292 | static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, |
293 | const struct ip6_tnl *t) |
294 | { |
295 | return __ip6gre_bucket(ign, p: &t->parms); |
296 | } |
297 | |
298 | static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) |
299 | { |
300 | struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); |
301 | |
302 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
303 | rcu_assign_pointer(*tp, t); |
304 | } |
305 | |
306 | static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) |
307 | { |
308 | struct ip6_tnl __rcu **tp; |
309 | struct ip6_tnl *iter; |
310 | |
311 | for (tp = ip6gre_bucket(ign, t); |
312 | (iter = rtnl_dereference(*tp)) != NULL; |
313 | tp = &iter->next) { |
314 | if (t == iter) { |
315 | rcu_assign_pointer(*tp, t->next); |
316 | break; |
317 | } |
318 | } |
319 | } |
320 | |
321 | static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, |
322 | const struct __ip6_tnl_parm *parms, |
323 | int type) |
324 | { |
325 | const struct in6_addr *remote = &parms->raddr; |
326 | const struct in6_addr *local = &parms->laddr; |
327 | __be32 key = parms->i_key; |
328 | int link = parms->link; |
329 | struct ip6_tnl *t; |
330 | struct ip6_tnl __rcu **tp; |
331 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
332 | |
333 | for (tp = __ip6gre_bucket(ign, p: parms); |
334 | (t = rtnl_dereference(*tp)) != NULL; |
335 | tp = &t->next) |
336 | if (ipv6_addr_equal(a1: local, a2: &t->parms.laddr) && |
337 | ipv6_addr_equal(a1: remote, a2: &t->parms.raddr) && |
338 | key == t->parms.i_key && |
339 | link == t->parms.link && |
340 | type == t->dev->type) |
341 | break; |
342 | |
343 | return t; |
344 | } |
345 | |
346 | static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, |
347 | const struct __ip6_tnl_parm *parms, int create) |
348 | { |
349 | struct ip6_tnl *t, *nt; |
350 | struct net_device *dev; |
351 | char name[IFNAMSIZ]; |
352 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
353 | |
354 | t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); |
355 | if (t && create) |
356 | return NULL; |
357 | if (t || !create) |
358 | return t; |
359 | |
360 | if (parms->name[0]) { |
361 | if (!dev_valid_name(name: parms->name)) |
362 | return NULL; |
363 | strscpy(p: name, q: parms->name, IFNAMSIZ); |
364 | } else { |
365 | strcpy(p: name, q: "ip6gre%d" ); |
366 | } |
367 | dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
368 | ip6gre_tunnel_setup); |
369 | if (!dev) |
370 | return NULL; |
371 | |
372 | dev_net_set(dev, net); |
373 | |
374 | nt = netdev_priv(dev); |
375 | nt->parms = *parms; |
376 | dev->rtnl_link_ops = &ip6gre_link_ops; |
377 | |
378 | nt->dev = dev; |
379 | nt->net = dev_net(dev); |
380 | |
381 | if (register_netdevice(dev) < 0) |
382 | goto failed_free; |
383 | |
384 | ip6gre_tnl_link_config(t: nt, set_mtu: 1); |
385 | ip6gre_tunnel_link(ign, t: nt); |
386 | return nt; |
387 | |
388 | failed_free: |
389 | free_netdev(dev); |
390 | return NULL; |
391 | } |
392 | |
393 | static void ip6erspan_tunnel_uninit(struct net_device *dev) |
394 | { |
395 | struct ip6_tnl *t = netdev_priv(dev); |
396 | struct ip6gre_net *ign = net_generic(net: t->net, id: ip6gre_net_id); |
397 | |
398 | ip6erspan_tunnel_unlink_md(ign, t); |
399 | ip6gre_tunnel_unlink(ign, t); |
400 | dst_cache_reset(dst_cache: &t->dst_cache); |
401 | netdev_put(dev, tracker: &t->dev_tracker); |
402 | } |
403 | |
404 | static void ip6gre_tunnel_uninit(struct net_device *dev) |
405 | { |
406 | struct ip6_tnl *t = netdev_priv(dev); |
407 | struct ip6gre_net *ign = net_generic(net: t->net, id: ip6gre_net_id); |
408 | |
409 | ip6gre_tunnel_unlink_md(ign, t); |
410 | ip6gre_tunnel_unlink(ign, t); |
411 | if (ign->fb_tunnel_dev == dev) |
412 | WRITE_ONCE(ign->fb_tunnel_dev, NULL); |
413 | dst_cache_reset(dst_cache: &t->dst_cache); |
414 | netdev_put(dev, tracker: &t->dev_tracker); |
415 | } |
416 | |
417 | |
418 | static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
419 | u8 type, u8 code, int offset, __be32 info) |
420 | { |
421 | struct net *net = dev_net(dev: skb->dev); |
422 | const struct ipv6hdr *ipv6h; |
423 | struct tnl_ptk_info tpi; |
424 | struct ip6_tnl *t; |
425 | |
426 | if (gre_parse_header(skb, tpi: &tpi, NULL, htons(ETH_P_IPV6), |
427 | nhs: offset) < 0) |
428 | return -EINVAL; |
429 | |
430 | ipv6h = (const struct ipv6hdr *)skb->data; |
431 | t = ip6gre_tunnel_lookup(dev: skb->dev, remote: &ipv6h->daddr, local: &ipv6h->saddr, |
432 | key: tpi.key, gre_proto: tpi.proto); |
433 | if (!t) |
434 | return -ENOENT; |
435 | |
436 | switch (type) { |
437 | case ICMPV6_DEST_UNREACH: |
438 | net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n" , |
439 | t->parms.name); |
440 | if (code != ICMPV6_PORT_UNREACH) |
441 | break; |
442 | return 0; |
443 | case ICMPV6_TIME_EXCEED: |
444 | if (code == ICMPV6_EXC_HOPLIMIT) { |
445 | net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n" , |
446 | t->parms.name); |
447 | break; |
448 | } |
449 | return 0; |
450 | case ICMPV6_PARAMPROB: { |
451 | struct ipv6_tlv_tnl_enc_lim *tel; |
452 | __u32 teli; |
453 | |
454 | teli = 0; |
455 | if (code == ICMPV6_HDR_FIELD) |
456 | teli = ip6_tnl_parse_tlv_enc_lim(skb, raw: skb->data); |
457 | |
458 | if (teli && teli == be32_to_cpu(info) - 2) { |
459 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
460 | if (tel->encap_limit == 0) { |
461 | net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n" , |
462 | t->parms.name); |
463 | } |
464 | } else { |
465 | net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n" , |
466 | t->parms.name); |
467 | } |
468 | return 0; |
469 | } |
470 | case ICMPV6_PKT_TOOBIG: |
471 | ip6_update_pmtu(skb, net, mtu: info, oif: 0, mark: 0, uid: sock_net_uid(net, NULL)); |
472 | return 0; |
473 | case NDISC_REDIRECT: |
474 | ip6_redirect(skb, net, oif: skb->dev->ifindex, mark: 0, |
475 | uid: sock_net_uid(net, NULL)); |
476 | return 0; |
477 | } |
478 | |
479 | if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) |
480 | t->err_count++; |
481 | else |
482 | t->err_count = 1; |
483 | t->err_time = jiffies; |
484 | |
485 | return 0; |
486 | } |
487 | |
488 | static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) |
489 | { |
490 | const struct ipv6hdr *ipv6h; |
491 | struct ip6_tnl *tunnel; |
492 | |
493 | ipv6h = ipv6_hdr(skb); |
494 | tunnel = ip6gre_tunnel_lookup(dev: skb->dev, |
495 | remote: &ipv6h->saddr, local: &ipv6h->daddr, key: tpi->key, |
496 | gre_proto: tpi->proto); |
497 | if (tunnel) { |
498 | if (tunnel->parms.collect_md) { |
499 | struct metadata_dst *tun_dst; |
500 | __be64 tun_id; |
501 | __be16 flags; |
502 | |
503 | flags = tpi->flags; |
504 | tun_id = key32_to_tunnel_id(key: tpi->key); |
505 | |
506 | tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id: tun_id, md_size: 0); |
507 | if (!tun_dst) |
508 | return PACKET_REJECT; |
509 | |
510 | ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
511 | } else { |
512 | ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
513 | } |
514 | |
515 | return PACKET_RCVD; |
516 | } |
517 | |
518 | return PACKET_REJECT; |
519 | } |
520 | |
521 | static int ip6erspan_rcv(struct sk_buff *skb, |
522 | struct tnl_ptk_info *tpi, |
523 | int gre_hdr_len) |
524 | { |
525 | struct erspan_base_hdr *ershdr; |
526 | const struct ipv6hdr *ipv6h; |
527 | struct erspan_md2 *md2; |
528 | struct ip6_tnl *tunnel; |
529 | u8 ver; |
530 | |
531 | ipv6h = ipv6_hdr(skb); |
532 | ershdr = (struct erspan_base_hdr *)skb->data; |
533 | ver = ershdr->ver; |
534 | |
535 | tunnel = ip6gre_tunnel_lookup(dev: skb->dev, |
536 | remote: &ipv6h->saddr, local: &ipv6h->daddr, key: tpi->key, |
537 | gre_proto: tpi->proto); |
538 | if (tunnel) { |
539 | int len = erspan_hdr_len(version: ver); |
540 | |
541 | if (unlikely(!pskb_may_pull(skb, len))) |
542 | return PACKET_REJECT; |
543 | |
544 | if (__iptunnel_pull_header(skb, hdr_len: len, |
545 | htons(ETH_P_TEB), |
546 | raw_proto: false, xnet: false) < 0) |
547 | return PACKET_REJECT; |
548 | |
549 | if (tunnel->parms.collect_md) { |
550 | struct erspan_metadata *pkt_md, *md; |
551 | struct metadata_dst *tun_dst; |
552 | struct ip_tunnel_info *info; |
553 | unsigned char *gh; |
554 | __be64 tun_id; |
555 | __be16 flags; |
556 | |
557 | tpi->flags |= TUNNEL_KEY; |
558 | flags = tpi->flags; |
559 | tun_id = key32_to_tunnel_id(key: tpi->key); |
560 | |
561 | tun_dst = ipv6_tun_rx_dst(skb, flags, tunnel_id: tun_id, |
562 | md_size: sizeof(*md)); |
563 | if (!tun_dst) |
564 | return PACKET_REJECT; |
565 | |
566 | /* skb can be uncloned in __iptunnel_pull_header, so |
567 | * old pkt_md is no longer valid and we need to reset |
568 | * it |
569 | */ |
570 | gh = skb_network_header(skb) + |
571 | skb_network_header_len(skb); |
572 | pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + |
573 | sizeof(*ershdr)); |
574 | info = &tun_dst->u.tun_info; |
575 | md = ip_tunnel_info_opts(info); |
576 | md->version = ver; |
577 | md2 = &md->u.md2; |
578 | memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : |
579 | ERSPAN_V2_MDSIZE); |
580 | info->key.tun_flags |= TUNNEL_ERSPAN_OPT; |
581 | info->options_len = sizeof(*md); |
582 | |
583 | ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
584 | |
585 | } else { |
586 | ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
587 | } |
588 | |
589 | return PACKET_RCVD; |
590 | } |
591 | |
592 | return PACKET_REJECT; |
593 | } |
594 | |
595 | static int gre_rcv(struct sk_buff *skb) |
596 | { |
597 | struct tnl_ptk_info tpi; |
598 | bool csum_err = false; |
599 | int hdr_len; |
600 | |
601 | hdr_len = gre_parse_header(skb, tpi: &tpi, csum_err: &csum_err, htons(ETH_P_IPV6), nhs: 0); |
602 | if (hdr_len < 0) |
603 | goto drop; |
604 | |
605 | if (iptunnel_pull_header(skb, hdr_len, inner_proto: tpi.proto, xnet: false)) |
606 | goto drop; |
607 | |
608 | if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || |
609 | tpi.proto == htons(ETH_P_ERSPAN2))) { |
610 | if (ip6erspan_rcv(skb, tpi: &tpi, gre_hdr_len: hdr_len) == PACKET_RCVD) |
611 | return 0; |
612 | goto out; |
613 | } |
614 | |
615 | if (ip6gre_rcv(skb, tpi: &tpi) == PACKET_RCVD) |
616 | return 0; |
617 | |
618 | out: |
619 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, info: 0); |
620 | drop: |
621 | kfree_skb(skb); |
622 | return 0; |
623 | } |
624 | |
625 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
626 | { |
627 | return iptunnel_handle_offloads(skb, |
628 | gso_type_mask: csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
629 | } |
630 | |
631 | static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, |
632 | struct net_device *dev, |
633 | struct flowi6 *fl6, __u8 *dsfield, |
634 | int *encap_limit) |
635 | { |
636 | const struct iphdr *iph = ip_hdr(skb); |
637 | struct ip6_tnl *t = netdev_priv(dev); |
638 | |
639 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
640 | *encap_limit = t->parms.encap_limit; |
641 | |
642 | memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); |
643 | |
644 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
645 | *dsfield = ipv4_get_dsfield(iph); |
646 | else |
647 | *dsfield = ip6_tclass(flowinfo: t->parms.flowinfo); |
648 | |
649 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
650 | fl6->flowi6_mark = skb->mark; |
651 | else |
652 | fl6->flowi6_mark = t->parms.fwmark; |
653 | |
654 | fl6->flowi6_uid = sock_net_uid(net: dev_net(dev), NULL); |
655 | } |
656 | |
657 | static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, |
658 | struct net_device *dev, |
659 | struct flowi6 *fl6, __u8 *dsfield, |
660 | int *encap_limit) |
661 | { |
662 | struct ipv6hdr *ipv6h; |
663 | struct ip6_tnl *t = netdev_priv(dev); |
664 | __u16 offset; |
665 | |
666 | offset = ip6_tnl_parse_tlv_enc_lim(skb, raw: skb_network_header(skb)); |
667 | /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ |
668 | ipv6h = ipv6_hdr(skb); |
669 | |
670 | if (offset > 0) { |
671 | struct ipv6_tlv_tnl_enc_lim *tel; |
672 | |
673 | tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
674 | if (tel->encap_limit == 0) { |
675 | icmpv6_ndo_send(skb_in: skb, ICMPV6_PARAMPROB, |
676 | ICMPV6_HDR_FIELD, info: offset + 2); |
677 | return -1; |
678 | } |
679 | *encap_limit = tel->encap_limit - 1; |
680 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { |
681 | *encap_limit = t->parms.encap_limit; |
682 | } |
683 | |
684 | memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); |
685 | |
686 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
687 | *dsfield = ipv6_get_dsfield(ipv6h); |
688 | else |
689 | *dsfield = ip6_tclass(flowinfo: t->parms.flowinfo); |
690 | |
691 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
692 | fl6->flowlabel |= ip6_flowlabel(hdr: ipv6h); |
693 | |
694 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
695 | fl6->flowi6_mark = skb->mark; |
696 | else |
697 | fl6->flowi6_mark = t->parms.fwmark; |
698 | |
699 | fl6->flowi6_uid = sock_net_uid(net: dev_net(dev), NULL); |
700 | |
701 | return 0; |
702 | } |
703 | |
704 | static int prepare_ip6gre_xmit_other(struct sk_buff *skb, |
705 | struct net_device *dev, |
706 | struct flowi6 *fl6, __u8 *dsfield, |
707 | int *encap_limit) |
708 | { |
709 | struct ip6_tnl *t = netdev_priv(dev); |
710 | |
711 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
712 | *encap_limit = t->parms.encap_limit; |
713 | |
714 | memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); |
715 | |
716 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
717 | *dsfield = 0; |
718 | else |
719 | *dsfield = ip6_tclass(flowinfo: t->parms.flowinfo); |
720 | |
721 | if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
722 | fl6->flowi6_mark = skb->mark; |
723 | else |
724 | fl6->flowi6_mark = t->parms.fwmark; |
725 | |
726 | fl6->flowi6_uid = sock_net_uid(net: dev_net(dev), NULL); |
727 | |
728 | return 0; |
729 | } |
730 | |
731 | static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) |
732 | { |
733 | struct ip_tunnel_info *tun_info; |
734 | |
735 | tun_info = skb_tunnel_info(skb); |
736 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) |
737 | return ERR_PTR(error: -EINVAL); |
738 | |
739 | return tun_info; |
740 | } |
741 | |
742 | static netdev_tx_t __gre6_xmit(struct sk_buff *skb, |
743 | struct net_device *dev, __u8 dsfield, |
744 | struct flowi6 *fl6, int encap_limit, |
745 | __u32 *pmtu, __be16 proto) |
746 | { |
747 | struct ip6_tnl *tunnel = netdev_priv(dev); |
748 | __be16 protocol; |
749 | __be16 flags; |
750 | |
751 | if (dev->type == ARPHRD_ETHER) |
752 | IPCB(skb)->flags = 0; |
753 | |
754 | if (dev->header_ops && dev->type == ARPHRD_IP6GRE) |
755 | fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; |
756 | else |
757 | fl6->daddr = tunnel->parms.raddr; |
758 | |
759 | /* Push GRE header. */ |
760 | protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; |
761 | |
762 | if (tunnel->parms.collect_md) { |
763 | struct ip_tunnel_info *tun_info; |
764 | const struct ip_tunnel_key *key; |
765 | int tun_hlen; |
766 | |
767 | tun_info = skb_tunnel_info_txcheck(skb); |
768 | if (IS_ERR(ptr: tun_info) || |
769 | unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) |
770 | return -EINVAL; |
771 | |
772 | key = &tun_info->key; |
773 | memset(fl6, 0, sizeof(*fl6)); |
774 | fl6->flowi6_proto = IPPROTO_GRE; |
775 | fl6->daddr = key->u.ipv6.dst; |
776 | fl6->flowlabel = key->label; |
777 | fl6->flowi6_uid = sock_net_uid(net: dev_net(dev), NULL); |
778 | fl6->fl6_gre_key = tunnel_id_to_key32(tun_id: key->tun_id); |
779 | |
780 | dsfield = key->tos; |
781 | flags = key->tun_flags & |
782 | (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); |
783 | tun_hlen = gre_calc_hlen(o_flags: flags); |
784 | |
785 | if (skb_cow_head(skb, headroom: dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen)) |
786 | return -ENOMEM; |
787 | |
788 | gre_build_header(skb, hdr_len: tun_hlen, |
789 | flags, proto: protocol, |
790 | key: tunnel_id_to_key32(tun_id: tun_info->key.tun_id), |
791 | seq: (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) |
792 | : 0); |
793 | |
794 | } else { |
795 | if (skb_cow_head(skb, headroom: dev->needed_headroom ?: tunnel->hlen)) |
796 | return -ENOMEM; |
797 | |
798 | flags = tunnel->parms.o_flags; |
799 | |
800 | gre_build_header(skb, hdr_len: tunnel->tun_hlen, flags, |
801 | proto: protocol, key: tunnel->parms.o_key, |
802 | seq: (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno)) |
803 | : 0); |
804 | } |
805 | |
806 | return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, |
807 | NEXTHDR_GRE); |
808 | } |
809 | |
810 | static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) |
811 | { |
812 | struct ip6_tnl *t = netdev_priv(dev); |
813 | int encap_limit = -1; |
814 | struct flowi6 fl6; |
815 | __u8 dsfield = 0; |
816 | __u32 mtu; |
817 | int err; |
818 | |
819 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
820 | |
821 | if (!t->parms.collect_md) |
822 | prepare_ip6gre_xmit_ipv4(skb, dev, fl6: &fl6, |
823 | dsfield: &dsfield, encap_limit: &encap_limit); |
824 | |
825 | err = gre_handle_offloads(skb, csum: !!(t->parms.o_flags & TUNNEL_CSUM)); |
826 | if (err) |
827 | return -1; |
828 | |
829 | err = __gre6_xmit(skb, dev, dsfield, fl6: &fl6, encap_limit, pmtu: &mtu, |
830 | proto: skb->protocol); |
831 | if (err != 0) { |
832 | /* XXX: send ICMP error even if DF is not set. */ |
833 | if (err == -EMSGSIZE) |
834 | icmp_ndo_send(skb_in: skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
835 | htonl(mtu)); |
836 | return -1; |
837 | } |
838 | |
839 | return 0; |
840 | } |
841 | |
842 | static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) |
843 | { |
844 | struct ip6_tnl *t = netdev_priv(dev); |
845 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
846 | int encap_limit = -1; |
847 | struct flowi6 fl6; |
848 | __u8 dsfield = 0; |
849 | __u32 mtu; |
850 | int err; |
851 | |
852 | if (ipv6_addr_equal(a1: &t->parms.raddr, a2: &ipv6h->saddr)) |
853 | return -1; |
854 | |
855 | if (!t->parms.collect_md && |
856 | prepare_ip6gre_xmit_ipv6(skb, dev, fl6: &fl6, dsfield: &dsfield, encap_limit: &encap_limit)) |
857 | return -1; |
858 | |
859 | if (gre_handle_offloads(skb, csum: !!(t->parms.o_flags & TUNNEL_CSUM))) |
860 | return -1; |
861 | |
862 | err = __gre6_xmit(skb, dev, dsfield, fl6: &fl6, encap_limit, |
863 | pmtu: &mtu, proto: skb->protocol); |
864 | if (err != 0) { |
865 | if (err == -EMSGSIZE) |
866 | icmpv6_ndo_send(skb_in: skb, ICMPV6_PKT_TOOBIG, code: 0, info: mtu); |
867 | return -1; |
868 | } |
869 | |
870 | return 0; |
871 | } |
872 | |
873 | static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) |
874 | { |
875 | struct ip6_tnl *t = netdev_priv(dev); |
876 | int encap_limit = -1; |
877 | struct flowi6 fl6; |
878 | __u8 dsfield = 0; |
879 | __u32 mtu; |
880 | int err; |
881 | |
882 | if (!t->parms.collect_md && |
883 | prepare_ip6gre_xmit_other(skb, dev, fl6: &fl6, dsfield: &dsfield, encap_limit: &encap_limit)) |
884 | return -1; |
885 | |
886 | err = gre_handle_offloads(skb, csum: !!(t->parms.o_flags & TUNNEL_CSUM)); |
887 | if (err) |
888 | return err; |
889 | err = __gre6_xmit(skb, dev, dsfield, fl6: &fl6, encap_limit, pmtu: &mtu, proto: skb->protocol); |
890 | |
891 | return err; |
892 | } |
893 | |
894 | static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, |
895 | struct net_device *dev) |
896 | { |
897 | struct ip6_tnl *t = netdev_priv(dev); |
898 | __be16 payload_protocol; |
899 | int ret; |
900 | |
901 | if (!pskb_inet_may_pull(skb)) |
902 | goto tx_err; |
903 | |
904 | if (!ip6_tnl_xmit_ctl(t, laddr: &t->parms.laddr, raddr: &t->parms.raddr)) |
905 | goto tx_err; |
906 | |
907 | payload_protocol = skb_protocol(skb, skip_vlan: true); |
908 | switch (payload_protocol) { |
909 | case htons(ETH_P_IP): |
910 | ret = ip6gre_xmit_ipv4(skb, dev); |
911 | break; |
912 | case htons(ETH_P_IPV6): |
913 | ret = ip6gre_xmit_ipv6(skb, dev); |
914 | break; |
915 | default: |
916 | ret = ip6gre_xmit_other(skb, dev); |
917 | break; |
918 | } |
919 | |
920 | if (ret < 0) |
921 | goto tx_err; |
922 | |
923 | return NETDEV_TX_OK; |
924 | |
925 | tx_err: |
926 | if (!t->parms.collect_md || !IS_ERR(ptr: skb_tunnel_info_txcheck(skb))) |
927 | DEV_STATS_INC(dev, tx_errors); |
928 | DEV_STATS_INC(dev, tx_dropped); |
929 | kfree_skb(skb); |
930 | return NETDEV_TX_OK; |
931 | } |
932 | |
933 | static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, |
934 | struct net_device *dev) |
935 | { |
936 | struct ip_tunnel_info *tun_info = NULL; |
937 | struct ip6_tnl *t = netdev_priv(dev); |
938 | struct dst_entry *dst = skb_dst(skb); |
939 | bool truncate = false; |
940 | int encap_limit = -1; |
941 | __u8 dsfield = false; |
942 | struct flowi6 fl6; |
943 | int err = -EINVAL; |
944 | __be16 proto; |
945 | __u32 mtu; |
946 | int nhoff; |
947 | |
948 | if (!pskb_inet_may_pull(skb)) |
949 | goto tx_err; |
950 | |
951 | if (!ip6_tnl_xmit_ctl(t, laddr: &t->parms.laddr, raddr: &t->parms.raddr)) |
952 | goto tx_err; |
953 | |
954 | if (gre_handle_offloads(skb, csum: false)) |
955 | goto tx_err; |
956 | |
957 | if (skb->len > dev->mtu + dev->hard_header_len) { |
958 | if (pskb_trim(skb, len: dev->mtu + dev->hard_header_len)) |
959 | goto tx_err; |
960 | truncate = true; |
961 | } |
962 | |
963 | nhoff = skb_network_offset(skb); |
964 | if (skb->protocol == htons(ETH_P_IP) && |
965 | (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) |
966 | truncate = true; |
967 | |
968 | if (skb->protocol == htons(ETH_P_IPV6)) { |
969 | int thoff; |
970 | |
971 | if (skb_transport_header_was_set(skb)) |
972 | thoff = skb_transport_offset(skb); |
973 | else |
974 | thoff = nhoff + sizeof(struct ipv6hdr); |
975 | if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff) |
976 | truncate = true; |
977 | } |
978 | |
979 | if (skb_cow_head(skb, headroom: dev->needed_headroom ?: t->hlen)) |
980 | goto tx_err; |
981 | |
982 | t->parms.o_flags &= ~TUNNEL_KEY; |
983 | IPCB(skb)->flags = 0; |
984 | |
985 | /* For collect_md mode, derive fl6 from the tunnel key, |
986 | * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. |
987 | */ |
988 | if (t->parms.collect_md) { |
989 | const struct ip_tunnel_key *key; |
990 | struct erspan_metadata *md; |
991 | __be32 tun_id; |
992 | |
993 | tun_info = skb_tunnel_info_txcheck(skb); |
994 | if (IS_ERR(ptr: tun_info) || |
995 | unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) |
996 | goto tx_err; |
997 | |
998 | key = &tun_info->key; |
999 | memset(&fl6, 0, sizeof(fl6)); |
1000 | fl6.flowi6_proto = IPPROTO_GRE; |
1001 | fl6.daddr = key->u.ipv6.dst; |
1002 | fl6.flowlabel = key->label; |
1003 | fl6.flowi6_uid = sock_net_uid(net: dev_net(dev), NULL); |
1004 | fl6.fl6_gre_key = tunnel_id_to_key32(tun_id: key->tun_id); |
1005 | |
1006 | dsfield = key->tos; |
1007 | if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) |
1008 | goto tx_err; |
1009 | if (tun_info->options_len < sizeof(*md)) |
1010 | goto tx_err; |
1011 | md = ip_tunnel_info_opts(tun_info); |
1012 | |
1013 | tun_id = tunnel_id_to_key32(tun_id: key->tun_id); |
1014 | if (md->version == 1) { |
1015 | erspan_build_header(skb, |
1016 | ntohl(tun_id), |
1017 | ntohl(md->u.index), truncate, |
1018 | is_ipv4: false); |
1019 | proto = htons(ETH_P_ERSPAN); |
1020 | } else if (md->version == 2) { |
1021 | erspan_build_header_v2(skb, |
1022 | ntohl(tun_id), |
1023 | direction: md->u.md2.dir, |
1024 | hwid: get_hwid(md2: &md->u.md2), |
1025 | truncate, is_ipv4: false); |
1026 | proto = htons(ETH_P_ERSPAN2); |
1027 | } else { |
1028 | goto tx_err; |
1029 | } |
1030 | } else { |
1031 | switch (skb->protocol) { |
1032 | case htons(ETH_P_IP): |
1033 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1034 | prepare_ip6gre_xmit_ipv4(skb, dev, fl6: &fl6, |
1035 | dsfield: &dsfield, encap_limit: &encap_limit); |
1036 | break; |
1037 | case htons(ETH_P_IPV6): |
1038 | if (ipv6_addr_equal(a1: &t->parms.raddr, a2: &ipv6_hdr(skb)->saddr)) |
1039 | goto tx_err; |
1040 | if (prepare_ip6gre_xmit_ipv6(skb, dev, fl6: &fl6, |
1041 | dsfield: &dsfield, encap_limit: &encap_limit)) |
1042 | goto tx_err; |
1043 | break; |
1044 | default: |
1045 | memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
1046 | break; |
1047 | } |
1048 | |
1049 | if (t->parms.erspan_ver == 1) { |
1050 | erspan_build_header(skb, ntohl(t->parms.o_key), |
1051 | index: t->parms.index, |
1052 | truncate, is_ipv4: false); |
1053 | proto = htons(ETH_P_ERSPAN); |
1054 | } else if (t->parms.erspan_ver == 2) { |
1055 | erspan_build_header_v2(skb, ntohl(t->parms.o_key), |
1056 | direction: t->parms.dir, |
1057 | hwid: t->parms.hwid, |
1058 | truncate, is_ipv4: false); |
1059 | proto = htons(ETH_P_ERSPAN2); |
1060 | } else { |
1061 | goto tx_err; |
1062 | } |
1063 | |
1064 | fl6.daddr = t->parms.raddr; |
1065 | } |
1066 | |
1067 | /* Push GRE header. */ |
1068 | gre_build_header(skb, hdr_len: 8, TUNNEL_SEQ, proto, key: 0, htonl(atomic_fetch_inc(&t->o_seqno))); |
1069 | |
1070 | /* TooBig packet may have updated dst->dev's mtu */ |
1071 | if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) |
1072 | dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); |
1073 | |
1074 | err = ip6_tnl_xmit(skb, dev, dsfield, fl6: &fl6, encap_limit, pmtu: &mtu, |
1075 | NEXTHDR_GRE); |
1076 | if (err != 0) { |
1077 | /* XXX: send ICMP error even if DF is not set. */ |
1078 | if (err == -EMSGSIZE) { |
1079 | if (skb->protocol == htons(ETH_P_IP)) |
1080 | icmp_ndo_send(skb_in: skb, ICMP_DEST_UNREACH, |
1081 | ICMP_FRAG_NEEDED, htonl(mtu)); |
1082 | else |
1083 | icmpv6_ndo_send(skb_in: skb, ICMPV6_PKT_TOOBIG, code: 0, info: mtu); |
1084 | } |
1085 | |
1086 | goto tx_err; |
1087 | } |
1088 | return NETDEV_TX_OK; |
1089 | |
1090 | tx_err: |
1091 | if (!IS_ERR(ptr: tun_info)) |
1092 | DEV_STATS_INC(dev, tx_errors); |
1093 | DEV_STATS_INC(dev, tx_dropped); |
1094 | kfree_skb(skb); |
1095 | return NETDEV_TX_OK; |
1096 | } |
1097 | |
1098 | static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) |
1099 | { |
1100 | struct net_device *dev = t->dev; |
1101 | struct __ip6_tnl_parm *p = &t->parms; |
1102 | struct flowi6 *fl6 = &t->fl.u.ip6; |
1103 | |
1104 | if (dev->type != ARPHRD_ETHER) { |
1105 | __dev_addr_set(dev, addr: &p->laddr, len: sizeof(struct in6_addr)); |
1106 | memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); |
1107 | } |
1108 | |
1109 | /* Set up flowi template */ |
1110 | fl6->saddr = p->laddr; |
1111 | fl6->daddr = p->raddr; |
1112 | fl6->flowi6_oif = p->link; |
1113 | fl6->flowlabel = 0; |
1114 | fl6->flowi6_proto = IPPROTO_GRE; |
1115 | fl6->fl6_gre_key = t->parms.o_key; |
1116 | |
1117 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) |
1118 | fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
1119 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
1120 | fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
1121 | |
1122 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
1123 | p->flags |= ip6_tnl_get_cap(t, laddr: &p->laddr, raddr: &p->raddr); |
1124 | |
1125 | if (p->flags&IP6_TNL_F_CAP_XMIT && |
1126 | p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) |
1127 | dev->flags |= IFF_POINTOPOINT; |
1128 | else |
1129 | dev->flags &= ~IFF_POINTOPOINT; |
1130 | } |
1131 | |
1132 | static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, |
1133 | int t_hlen) |
1134 | { |
1135 | const struct __ip6_tnl_parm *p = &t->parms; |
1136 | struct net_device *dev = t->dev; |
1137 | |
1138 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
1139 | int strict = (ipv6_addr_type(addr: &p->raddr) & |
1140 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); |
1141 | |
1142 | struct rt6_info *rt = rt6_lookup(net: t->net, |
1143 | daddr: &p->raddr, saddr: &p->laddr, |
1144 | oif: p->link, NULL, flags: strict); |
1145 | |
1146 | if (!rt) |
1147 | return; |
1148 | |
1149 | if (rt->dst.dev) { |
1150 | unsigned short dst_len = rt->dst.dev->hard_header_len + |
1151 | t_hlen; |
1152 | |
1153 | if (t->dev->header_ops) |
1154 | dev->hard_header_len = dst_len; |
1155 | else |
1156 | dev->needed_headroom = dst_len; |
1157 | |
1158 | if (set_mtu) { |
1159 | int mtu = rt->dst.dev->mtu - t_hlen; |
1160 | |
1161 | if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1162 | mtu -= 8; |
1163 | if (dev->type == ARPHRD_ETHER) |
1164 | mtu -= ETH_HLEN; |
1165 | |
1166 | if (mtu < IPV6_MIN_MTU) |
1167 | mtu = IPV6_MIN_MTU; |
1168 | WRITE_ONCE(dev->mtu, mtu); |
1169 | } |
1170 | } |
1171 | ip6_rt_put(rt); |
1172 | } |
1173 | } |
1174 | |
1175 | static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) |
1176 | { |
1177 | int t_hlen; |
1178 | |
1179 | tunnel->tun_hlen = gre_calc_hlen(o_flags: tunnel->parms.o_flags); |
1180 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
1181 | |
1182 | t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); |
1183 | |
1184 | if (tunnel->dev->header_ops) |
1185 | tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
1186 | else |
1187 | tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; |
1188 | |
1189 | return t_hlen; |
1190 | } |
1191 | |
1192 | static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) |
1193 | { |
1194 | ip6gre_tnl_link_config_common(t); |
1195 | ip6gre_tnl_link_config_route(t, set_mtu, t_hlen: ip6gre_calc_hlen(tunnel: t)); |
1196 | } |
1197 | |
1198 | static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, |
1199 | const struct __ip6_tnl_parm *p) |
1200 | { |
1201 | t->parms.laddr = p->laddr; |
1202 | t->parms.raddr = p->raddr; |
1203 | t->parms.flags = p->flags; |
1204 | t->parms.hop_limit = p->hop_limit; |
1205 | t->parms.encap_limit = p->encap_limit; |
1206 | t->parms.flowinfo = p->flowinfo; |
1207 | t->parms.link = p->link; |
1208 | t->parms.proto = p->proto; |
1209 | t->parms.i_key = p->i_key; |
1210 | t->parms.o_key = p->o_key; |
1211 | t->parms.i_flags = p->i_flags; |
1212 | t->parms.o_flags = p->o_flags; |
1213 | t->parms.fwmark = p->fwmark; |
1214 | t->parms.erspan_ver = p->erspan_ver; |
1215 | t->parms.index = p->index; |
1216 | t->parms.dir = p->dir; |
1217 | t->parms.hwid = p->hwid; |
1218 | dst_cache_reset(dst_cache: &t->dst_cache); |
1219 | } |
1220 | |
1221 | static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, |
1222 | int set_mtu) |
1223 | { |
1224 | ip6gre_tnl_copy_tnl_parm(t, p); |
1225 | ip6gre_tnl_link_config(t, set_mtu); |
1226 | return 0; |
1227 | } |
1228 | |
1229 | static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, |
1230 | const struct ip6_tnl_parm2 *u) |
1231 | { |
1232 | p->laddr = u->laddr; |
1233 | p->raddr = u->raddr; |
1234 | p->flags = u->flags; |
1235 | p->hop_limit = u->hop_limit; |
1236 | p->encap_limit = u->encap_limit; |
1237 | p->flowinfo = u->flowinfo; |
1238 | p->link = u->link; |
1239 | p->i_key = u->i_key; |
1240 | p->o_key = u->o_key; |
1241 | p->i_flags = gre_flags_to_tnl_flags(flags: u->i_flags); |
1242 | p->o_flags = gre_flags_to_tnl_flags(flags: u->o_flags); |
1243 | memcpy(p->name, u->name, sizeof(u->name)); |
1244 | } |
1245 | |
1246 | static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, |
1247 | const struct __ip6_tnl_parm *p) |
1248 | { |
1249 | u->proto = IPPROTO_GRE; |
1250 | u->laddr = p->laddr; |
1251 | u->raddr = p->raddr; |
1252 | u->flags = p->flags; |
1253 | u->hop_limit = p->hop_limit; |
1254 | u->encap_limit = p->encap_limit; |
1255 | u->flowinfo = p->flowinfo; |
1256 | u->link = p->link; |
1257 | u->i_key = p->i_key; |
1258 | u->o_key = p->o_key; |
1259 | u->i_flags = gre_tnl_flags_to_gre_flags(tflags: p->i_flags); |
1260 | u->o_flags = gre_tnl_flags_to_gre_flags(tflags: p->o_flags); |
1261 | memcpy(u->name, p->name, sizeof(u->name)); |
1262 | } |
1263 | |
1264 | static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, |
1265 | struct ifreq *ifr, void __user *data, |
1266 | int cmd) |
1267 | { |
1268 | int err = 0; |
1269 | struct ip6_tnl_parm2 p; |
1270 | struct __ip6_tnl_parm p1; |
1271 | struct ip6_tnl *t = netdev_priv(dev); |
1272 | struct net *net = t->net; |
1273 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
1274 | |
1275 | memset(&p1, 0, sizeof(p1)); |
1276 | |
1277 | switch (cmd) { |
1278 | case SIOCGETTUNNEL: |
1279 | if (dev == ign->fb_tunnel_dev) { |
1280 | if (copy_from_user(to: &p, from: data, n: sizeof(p))) { |
1281 | err = -EFAULT; |
1282 | break; |
1283 | } |
1284 | ip6gre_tnl_parm_from_user(p: &p1, u: &p); |
1285 | t = ip6gre_tunnel_locate(net, parms: &p1, create: 0); |
1286 | if (!t) |
1287 | t = netdev_priv(dev); |
1288 | } |
1289 | memset(&p, 0, sizeof(p)); |
1290 | ip6gre_tnl_parm_to_user(u: &p, p: &t->parms); |
1291 | if (copy_to_user(to: data, from: &p, n: sizeof(p))) |
1292 | err = -EFAULT; |
1293 | break; |
1294 | |
1295 | case SIOCADDTUNNEL: |
1296 | case SIOCCHGTUNNEL: |
1297 | err = -EPERM; |
1298 | if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN)) |
1299 | goto done; |
1300 | |
1301 | err = -EFAULT; |
1302 | if (copy_from_user(to: &p, from: data, n: sizeof(p))) |
1303 | goto done; |
1304 | |
1305 | err = -EINVAL; |
1306 | if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) |
1307 | goto done; |
1308 | |
1309 | if (!(p.i_flags&GRE_KEY)) |
1310 | p.i_key = 0; |
1311 | if (!(p.o_flags&GRE_KEY)) |
1312 | p.o_key = 0; |
1313 | |
1314 | ip6gre_tnl_parm_from_user(p: &p1, u: &p); |
1315 | t = ip6gre_tunnel_locate(net, parms: &p1, create: cmd == SIOCADDTUNNEL); |
1316 | |
1317 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1318 | if (t) { |
1319 | if (t->dev != dev) { |
1320 | err = -EEXIST; |
1321 | break; |
1322 | } |
1323 | } else { |
1324 | t = netdev_priv(dev); |
1325 | |
1326 | ip6gre_tunnel_unlink(ign, t); |
1327 | synchronize_net(); |
1328 | ip6gre_tnl_change(t, p: &p1, set_mtu: 1); |
1329 | ip6gre_tunnel_link(ign, t); |
1330 | netdev_state_change(dev); |
1331 | } |
1332 | } |
1333 | |
1334 | if (t) { |
1335 | err = 0; |
1336 | |
1337 | memset(&p, 0, sizeof(p)); |
1338 | ip6gre_tnl_parm_to_user(u: &p, p: &t->parms); |
1339 | if (copy_to_user(to: data, from: &p, n: sizeof(p))) |
1340 | err = -EFAULT; |
1341 | } else |
1342 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
1343 | break; |
1344 | |
1345 | case SIOCDELTUNNEL: |
1346 | err = -EPERM; |
1347 | if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN)) |
1348 | goto done; |
1349 | |
1350 | if (dev == ign->fb_tunnel_dev) { |
1351 | err = -EFAULT; |
1352 | if (copy_from_user(to: &p, from: data, n: sizeof(p))) |
1353 | goto done; |
1354 | err = -ENOENT; |
1355 | ip6gre_tnl_parm_from_user(p: &p1, u: &p); |
1356 | t = ip6gre_tunnel_locate(net, parms: &p1, create: 0); |
1357 | if (!t) |
1358 | goto done; |
1359 | err = -EPERM; |
1360 | if (t == netdev_priv(dev: ign->fb_tunnel_dev)) |
1361 | goto done; |
1362 | dev = t->dev; |
1363 | } |
1364 | unregister_netdevice(dev); |
1365 | err = 0; |
1366 | break; |
1367 | |
1368 | default: |
1369 | err = -EINVAL; |
1370 | } |
1371 | |
1372 | done: |
1373 | return err; |
1374 | } |
1375 | |
1376 | static int (struct sk_buff *skb, struct net_device *dev, |
1377 | unsigned short type, const void *daddr, |
1378 | const void *saddr, unsigned int len) |
1379 | { |
1380 | struct ip6_tnl *t = netdev_priv(dev); |
1381 | struct ipv6hdr *ipv6h; |
1382 | __be16 *p; |
1383 | |
1384 | ipv6h = skb_push(skb, len: t->hlen + sizeof(*ipv6h)); |
1385 | ip6_flow_hdr(hdr: ipv6h, tclass: 0, flowlabel: ip6_make_flowlabel(net: dev_net(dev), skb, |
1386 | flowlabel: t->fl.u.ip6.flowlabel, |
1387 | autolabel: true, fl6: &t->fl.u.ip6)); |
1388 | ipv6h->hop_limit = t->parms.hop_limit; |
1389 | ipv6h->nexthdr = NEXTHDR_GRE; |
1390 | ipv6h->saddr = t->parms.laddr; |
1391 | ipv6h->daddr = t->parms.raddr; |
1392 | |
1393 | p = (__be16 *)(ipv6h + 1); |
1394 | p[0] = t->parms.o_flags; |
1395 | p[1] = htons(type); |
1396 | |
1397 | /* |
1398 | * Set the source hardware address. |
1399 | */ |
1400 | |
1401 | if (saddr) |
1402 | memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); |
1403 | if (daddr) |
1404 | memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); |
1405 | if (!ipv6_addr_any(a: &ipv6h->daddr)) |
1406 | return t->hlen; |
1407 | |
1408 | return -t->hlen; |
1409 | } |
1410 | |
1411 | static const struct header_ops = { |
1412 | .create = ip6gre_header, |
1413 | }; |
1414 | |
1415 | static const struct net_device_ops ip6gre_netdev_ops = { |
1416 | .ndo_init = ip6gre_tunnel_init, |
1417 | .ndo_uninit = ip6gre_tunnel_uninit, |
1418 | .ndo_start_xmit = ip6gre_tunnel_xmit, |
1419 | .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate, |
1420 | .ndo_change_mtu = ip6_tnl_change_mtu, |
1421 | .ndo_get_stats64 = dev_get_tstats64, |
1422 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1423 | }; |
1424 | |
1425 | static void ip6gre_dev_free(struct net_device *dev) |
1426 | { |
1427 | struct ip6_tnl *t = netdev_priv(dev); |
1428 | |
1429 | gro_cells_destroy(gcells: &t->gro_cells); |
1430 | dst_cache_destroy(dst_cache: &t->dst_cache); |
1431 | free_percpu(pdata: dev->tstats); |
1432 | } |
1433 | |
1434 | static void ip6gre_tunnel_setup(struct net_device *dev) |
1435 | { |
1436 | dev->netdev_ops = &ip6gre_netdev_ops; |
1437 | dev->needs_free_netdev = true; |
1438 | dev->priv_destructor = ip6gre_dev_free; |
1439 | |
1440 | dev->type = ARPHRD_IP6GRE; |
1441 | |
1442 | dev->flags |= IFF_NOARP; |
1443 | dev->addr_len = sizeof(struct in6_addr); |
1444 | netif_keep_dst(dev); |
1445 | /* This perm addr will be used as interface identifier by IPv6 */ |
1446 | dev->addr_assign_type = NET_ADDR_RANDOM; |
1447 | eth_random_addr(addr: dev->perm_addr); |
1448 | } |
1449 | |
1450 | #define GRE6_FEATURES (NETIF_F_SG | \ |
1451 | NETIF_F_FRAGLIST | \ |
1452 | NETIF_F_HIGHDMA | \ |
1453 | NETIF_F_HW_CSUM) |
1454 | |
1455 | static void ip6gre_tnl_init_features(struct net_device *dev) |
1456 | { |
1457 | struct ip6_tnl *nt = netdev_priv(dev); |
1458 | __be16 flags; |
1459 | |
1460 | dev->features |= GRE6_FEATURES | NETIF_F_LLTX; |
1461 | dev->hw_features |= GRE6_FEATURES; |
1462 | |
1463 | flags = nt->parms.o_flags; |
1464 | |
1465 | /* TCP offload with GRE SEQ is not supported, nor can we support 2 |
1466 | * levels of outer headers requiring an update. |
1467 | */ |
1468 | if (flags & TUNNEL_SEQ) |
1469 | return; |
1470 | if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE) |
1471 | return; |
1472 | |
1473 | dev->features |= NETIF_F_GSO_SOFTWARE; |
1474 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
1475 | } |
1476 | |
1477 | static int ip6gre_tunnel_init_common(struct net_device *dev) |
1478 | { |
1479 | struct ip6_tnl *tunnel; |
1480 | int ret; |
1481 | int t_hlen; |
1482 | |
1483 | tunnel = netdev_priv(dev); |
1484 | |
1485 | tunnel->dev = dev; |
1486 | tunnel->net = dev_net(dev); |
1487 | strcpy(p: tunnel->parms.name, q: dev->name); |
1488 | |
1489 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
1490 | if (!dev->tstats) |
1491 | return -ENOMEM; |
1492 | |
1493 | ret = dst_cache_init(dst_cache: &tunnel->dst_cache, GFP_KERNEL); |
1494 | if (ret) |
1495 | goto cleanup_alloc_pcpu_stats; |
1496 | |
1497 | ret = gro_cells_init(gcells: &tunnel->gro_cells, dev); |
1498 | if (ret) |
1499 | goto cleanup_dst_cache_init; |
1500 | |
1501 | t_hlen = ip6gre_calc_hlen(tunnel); |
1502 | dev->mtu = ETH_DATA_LEN - t_hlen; |
1503 | if (dev->type == ARPHRD_ETHER) |
1504 | dev->mtu -= ETH_HLEN; |
1505 | if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1506 | dev->mtu -= 8; |
1507 | |
1508 | if (tunnel->parms.collect_md) { |
1509 | netif_keep_dst(dev); |
1510 | } |
1511 | ip6gre_tnl_init_features(dev); |
1512 | |
1513 | netdev_hold(dev, tracker: &tunnel->dev_tracker, GFP_KERNEL); |
1514 | return 0; |
1515 | |
1516 | cleanup_dst_cache_init: |
1517 | dst_cache_destroy(dst_cache: &tunnel->dst_cache); |
1518 | cleanup_alloc_pcpu_stats: |
1519 | free_percpu(pdata: dev->tstats); |
1520 | dev->tstats = NULL; |
1521 | return ret; |
1522 | } |
1523 | |
1524 | static int ip6gre_tunnel_init(struct net_device *dev) |
1525 | { |
1526 | struct ip6_tnl *tunnel; |
1527 | int ret; |
1528 | |
1529 | ret = ip6gre_tunnel_init_common(dev); |
1530 | if (ret) |
1531 | return ret; |
1532 | |
1533 | tunnel = netdev_priv(dev); |
1534 | |
1535 | if (tunnel->parms.collect_md) |
1536 | return 0; |
1537 | |
1538 | __dev_addr_set(dev, addr: &tunnel->parms.laddr, len: sizeof(struct in6_addr)); |
1539 | memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); |
1540 | |
1541 | if (ipv6_addr_any(a: &tunnel->parms.raddr)) |
1542 | dev->header_ops = &ip6gre_header_ops; |
1543 | |
1544 | return 0; |
1545 | } |
1546 | |
1547 | static void ip6gre_fb_tunnel_init(struct net_device *dev) |
1548 | { |
1549 | struct ip6_tnl *tunnel = netdev_priv(dev); |
1550 | |
1551 | tunnel->dev = dev; |
1552 | tunnel->net = dev_net(dev); |
1553 | strcpy(p: tunnel->parms.name, q: dev->name); |
1554 | |
1555 | tunnel->hlen = sizeof(struct ipv6hdr) + 4; |
1556 | } |
1557 | |
1558 | static struct inet6_protocol ip6gre_protocol __read_mostly = { |
1559 | .handler = gre_rcv, |
1560 | .err_handler = ip6gre_err, |
1561 | .flags = INET6_PROTO_FINAL, |
1562 | }; |
1563 | |
1564 | static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) |
1565 | { |
1566 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
1567 | struct net_device *dev, *aux; |
1568 | int prio; |
1569 | |
1570 | for_each_netdev_safe(net, dev, aux) |
1571 | if (dev->rtnl_link_ops == &ip6gre_link_ops || |
1572 | dev->rtnl_link_ops == &ip6gre_tap_ops || |
1573 | dev->rtnl_link_ops == &ip6erspan_tap_ops) |
1574 | unregister_netdevice_queue(dev, head); |
1575 | |
1576 | for (prio = 0; prio < 4; prio++) { |
1577 | int h; |
1578 | for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { |
1579 | struct ip6_tnl *t; |
1580 | |
1581 | t = rtnl_dereference(ign->tunnels[prio][h]); |
1582 | |
1583 | while (t) { |
1584 | /* If dev is in the same netns, it has already |
1585 | * been added to the list by the previous loop. |
1586 | */ |
1587 | if (!net_eq(net1: dev_net(dev: t->dev), net2: net)) |
1588 | unregister_netdevice_queue(dev: t->dev, |
1589 | head); |
1590 | t = rtnl_dereference(t->next); |
1591 | } |
1592 | } |
1593 | } |
1594 | } |
1595 | |
1596 | static int __net_init ip6gre_init_net(struct net *net) |
1597 | { |
1598 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
1599 | struct net_device *ndev; |
1600 | int err; |
1601 | |
1602 | if (!net_has_fallback_tunnels(net)) |
1603 | return 0; |
1604 | ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0" , |
1605 | NET_NAME_UNKNOWN, ip6gre_tunnel_setup); |
1606 | if (!ndev) { |
1607 | err = -ENOMEM; |
1608 | goto err_alloc_dev; |
1609 | } |
1610 | ign->fb_tunnel_dev = ndev; |
1611 | dev_net_set(dev: ign->fb_tunnel_dev, net); |
1612 | /* FB netdevice is special: we have one, and only one per netns. |
1613 | * Allowing to move it to another netns is clearly unsafe. |
1614 | */ |
1615 | ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
1616 | |
1617 | |
1618 | ip6gre_fb_tunnel_init(dev: ign->fb_tunnel_dev); |
1619 | ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; |
1620 | |
1621 | err = register_netdev(dev: ign->fb_tunnel_dev); |
1622 | if (err) |
1623 | goto err_reg_dev; |
1624 | |
1625 | rcu_assign_pointer(ign->tunnels_wc[0], |
1626 | netdev_priv(ign->fb_tunnel_dev)); |
1627 | return 0; |
1628 | |
1629 | err_reg_dev: |
1630 | free_netdev(dev: ndev); |
1631 | err_alloc_dev: |
1632 | return err; |
1633 | } |
1634 | |
1635 | static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list) |
1636 | { |
1637 | struct net *net; |
1638 | LIST_HEAD(list); |
1639 | |
1640 | rtnl_lock(); |
1641 | list_for_each_entry(net, net_list, exit_list) |
1642 | ip6gre_destroy_tunnels(net, head: &list); |
1643 | unregister_netdevice_many(head: &list); |
1644 | rtnl_unlock(); |
1645 | } |
1646 | |
1647 | static struct pernet_operations ip6gre_net_ops = { |
1648 | .init = ip6gre_init_net, |
1649 | .exit_batch = ip6gre_exit_batch_net, |
1650 | .id = &ip6gre_net_id, |
1651 | .size = sizeof(struct ip6gre_net), |
1652 | }; |
1653 | |
1654 | static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
1655 | struct netlink_ext_ack *extack) |
1656 | { |
1657 | __be16 flags; |
1658 | |
1659 | if (!data) |
1660 | return 0; |
1661 | |
1662 | flags = 0; |
1663 | if (data[IFLA_GRE_IFLAGS]) |
1664 | flags |= nla_get_be16(nla: data[IFLA_GRE_IFLAGS]); |
1665 | if (data[IFLA_GRE_OFLAGS]) |
1666 | flags |= nla_get_be16(nla: data[IFLA_GRE_OFLAGS]); |
1667 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
1668 | return -EINVAL; |
1669 | |
1670 | return 0; |
1671 | } |
1672 | |
1673 | static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
1674 | struct netlink_ext_ack *extack) |
1675 | { |
1676 | struct in6_addr daddr; |
1677 | |
1678 | if (tb[IFLA_ADDRESS]) { |
1679 | if (nla_len(nla: tb[IFLA_ADDRESS]) != ETH_ALEN) |
1680 | return -EINVAL; |
1681 | if (!is_valid_ether_addr(addr: nla_data(nla: tb[IFLA_ADDRESS]))) |
1682 | return -EADDRNOTAVAIL; |
1683 | } |
1684 | |
1685 | if (!data) |
1686 | goto out; |
1687 | |
1688 | if (data[IFLA_GRE_REMOTE]) { |
1689 | daddr = nla_get_in6_addr(nla: data[IFLA_GRE_REMOTE]); |
1690 | if (ipv6_addr_any(a: &daddr)) |
1691 | return -EINVAL; |
1692 | } |
1693 | |
1694 | out: |
1695 | return ip6gre_tunnel_validate(tb, data, extack); |
1696 | } |
1697 | |
1698 | static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
1699 | struct netlink_ext_ack *extack) |
1700 | { |
1701 | __be16 flags = 0; |
1702 | int ret, ver = 0; |
1703 | |
1704 | if (!data) |
1705 | return 0; |
1706 | |
1707 | ret = ip6gre_tap_validate(tb, data, extack); |
1708 | if (ret) |
1709 | return ret; |
1710 | |
1711 | /* ERSPAN should only have GRE sequence and key flag */ |
1712 | if (data[IFLA_GRE_OFLAGS]) |
1713 | flags |= nla_get_be16(nla: data[IFLA_GRE_OFLAGS]); |
1714 | if (data[IFLA_GRE_IFLAGS]) |
1715 | flags |= nla_get_be16(nla: data[IFLA_GRE_IFLAGS]); |
1716 | if (!data[IFLA_GRE_COLLECT_METADATA] && |
1717 | flags != (GRE_SEQ | GRE_KEY)) |
1718 | return -EINVAL; |
1719 | |
1720 | /* ERSPAN Session ID only has 10-bit. Since we reuse |
1721 | * 32-bit key field as ID, check it's range. |
1722 | */ |
1723 | if (data[IFLA_GRE_IKEY] && |
1724 | (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) |
1725 | return -EINVAL; |
1726 | |
1727 | if (data[IFLA_GRE_OKEY] && |
1728 | (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) |
1729 | return -EINVAL; |
1730 | |
1731 | if (data[IFLA_GRE_ERSPAN_VER]) { |
1732 | ver = nla_get_u8(nla: data[IFLA_GRE_ERSPAN_VER]); |
1733 | if (ver != 1 && ver != 2) |
1734 | return -EINVAL; |
1735 | } |
1736 | |
1737 | if (ver == 1) { |
1738 | if (data[IFLA_GRE_ERSPAN_INDEX]) { |
1739 | u32 index = nla_get_u32(nla: data[IFLA_GRE_ERSPAN_INDEX]); |
1740 | |
1741 | if (index & ~INDEX_MASK) |
1742 | return -EINVAL; |
1743 | } |
1744 | } else if (ver == 2) { |
1745 | if (data[IFLA_GRE_ERSPAN_DIR]) { |
1746 | u16 dir = nla_get_u8(nla: data[IFLA_GRE_ERSPAN_DIR]); |
1747 | |
1748 | if (dir & ~(DIR_MASK >> DIR_OFFSET)) |
1749 | return -EINVAL; |
1750 | } |
1751 | |
1752 | if (data[IFLA_GRE_ERSPAN_HWID]) { |
1753 | u16 hwid = nla_get_u16(nla: data[IFLA_GRE_ERSPAN_HWID]); |
1754 | |
1755 | if (hwid & ~(HWID_MASK >> HWID_OFFSET)) |
1756 | return -EINVAL; |
1757 | } |
1758 | } |
1759 | |
1760 | return 0; |
1761 | } |
1762 | |
1763 | static void ip6erspan_set_version(struct nlattr *data[], |
1764 | struct __ip6_tnl_parm *parms) |
1765 | { |
1766 | if (!data) |
1767 | return; |
1768 | |
1769 | parms->erspan_ver = 1; |
1770 | if (data[IFLA_GRE_ERSPAN_VER]) |
1771 | parms->erspan_ver = nla_get_u8(nla: data[IFLA_GRE_ERSPAN_VER]); |
1772 | |
1773 | if (parms->erspan_ver == 1) { |
1774 | if (data[IFLA_GRE_ERSPAN_INDEX]) |
1775 | parms->index = nla_get_u32(nla: data[IFLA_GRE_ERSPAN_INDEX]); |
1776 | } else if (parms->erspan_ver == 2) { |
1777 | if (data[IFLA_GRE_ERSPAN_DIR]) |
1778 | parms->dir = nla_get_u8(nla: data[IFLA_GRE_ERSPAN_DIR]); |
1779 | if (data[IFLA_GRE_ERSPAN_HWID]) |
1780 | parms->hwid = nla_get_u16(nla: data[IFLA_GRE_ERSPAN_HWID]); |
1781 | } |
1782 | } |
1783 | |
1784 | static void ip6gre_netlink_parms(struct nlattr *data[], |
1785 | struct __ip6_tnl_parm *parms) |
1786 | { |
1787 | memset(parms, 0, sizeof(*parms)); |
1788 | |
1789 | if (!data) |
1790 | return; |
1791 | |
1792 | if (data[IFLA_GRE_LINK]) |
1793 | parms->link = nla_get_u32(nla: data[IFLA_GRE_LINK]); |
1794 | |
1795 | if (data[IFLA_GRE_IFLAGS]) |
1796 | parms->i_flags = gre_flags_to_tnl_flags( |
1797 | flags: nla_get_be16(nla: data[IFLA_GRE_IFLAGS])); |
1798 | |
1799 | if (data[IFLA_GRE_OFLAGS]) |
1800 | parms->o_flags = gre_flags_to_tnl_flags( |
1801 | flags: nla_get_be16(nla: data[IFLA_GRE_OFLAGS])); |
1802 | |
1803 | if (data[IFLA_GRE_IKEY]) |
1804 | parms->i_key = nla_get_be32(nla: data[IFLA_GRE_IKEY]); |
1805 | |
1806 | if (data[IFLA_GRE_OKEY]) |
1807 | parms->o_key = nla_get_be32(nla: data[IFLA_GRE_OKEY]); |
1808 | |
1809 | if (data[IFLA_GRE_LOCAL]) |
1810 | parms->laddr = nla_get_in6_addr(nla: data[IFLA_GRE_LOCAL]); |
1811 | |
1812 | if (data[IFLA_GRE_REMOTE]) |
1813 | parms->raddr = nla_get_in6_addr(nla: data[IFLA_GRE_REMOTE]); |
1814 | |
1815 | if (data[IFLA_GRE_TTL]) |
1816 | parms->hop_limit = nla_get_u8(nla: data[IFLA_GRE_TTL]); |
1817 | |
1818 | if (data[IFLA_GRE_ENCAP_LIMIT]) |
1819 | parms->encap_limit = nla_get_u8(nla: data[IFLA_GRE_ENCAP_LIMIT]); |
1820 | |
1821 | if (data[IFLA_GRE_FLOWINFO]) |
1822 | parms->flowinfo = nla_get_be32(nla: data[IFLA_GRE_FLOWINFO]); |
1823 | |
1824 | if (data[IFLA_GRE_FLAGS]) |
1825 | parms->flags = nla_get_u32(nla: data[IFLA_GRE_FLAGS]); |
1826 | |
1827 | if (data[IFLA_GRE_FWMARK]) |
1828 | parms->fwmark = nla_get_u32(nla: data[IFLA_GRE_FWMARK]); |
1829 | |
1830 | if (data[IFLA_GRE_COLLECT_METADATA]) |
1831 | parms->collect_md = true; |
1832 | } |
1833 | |
1834 | static int ip6gre_tap_init(struct net_device *dev) |
1835 | { |
1836 | int ret; |
1837 | |
1838 | ret = ip6gre_tunnel_init_common(dev); |
1839 | if (ret) |
1840 | return ret; |
1841 | |
1842 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1843 | |
1844 | return 0; |
1845 | } |
1846 | |
1847 | static const struct net_device_ops ip6gre_tap_netdev_ops = { |
1848 | .ndo_init = ip6gre_tap_init, |
1849 | .ndo_uninit = ip6gre_tunnel_uninit, |
1850 | .ndo_start_xmit = ip6gre_tunnel_xmit, |
1851 | .ndo_set_mac_address = eth_mac_addr, |
1852 | .ndo_validate_addr = eth_validate_addr, |
1853 | .ndo_change_mtu = ip6_tnl_change_mtu, |
1854 | .ndo_get_stats64 = dev_get_tstats64, |
1855 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1856 | }; |
1857 | |
1858 | static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) |
1859 | { |
1860 | int t_hlen; |
1861 | |
1862 | tunnel->tun_hlen = 8; |
1863 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
1864 | erspan_hdr_len(version: tunnel->parms.erspan_ver); |
1865 | |
1866 | t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); |
1867 | tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; |
1868 | return t_hlen; |
1869 | } |
1870 | |
1871 | static int ip6erspan_tap_init(struct net_device *dev) |
1872 | { |
1873 | struct ip6_tnl *tunnel; |
1874 | int t_hlen; |
1875 | int ret; |
1876 | |
1877 | tunnel = netdev_priv(dev); |
1878 | |
1879 | tunnel->dev = dev; |
1880 | tunnel->net = dev_net(dev); |
1881 | strcpy(p: tunnel->parms.name, q: dev->name); |
1882 | |
1883 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
1884 | if (!dev->tstats) |
1885 | return -ENOMEM; |
1886 | |
1887 | ret = dst_cache_init(dst_cache: &tunnel->dst_cache, GFP_KERNEL); |
1888 | if (ret) |
1889 | goto cleanup_alloc_pcpu_stats; |
1890 | |
1891 | ret = gro_cells_init(gcells: &tunnel->gro_cells, dev); |
1892 | if (ret) |
1893 | goto cleanup_dst_cache_init; |
1894 | |
1895 | t_hlen = ip6erspan_calc_hlen(tunnel); |
1896 | dev->mtu = ETH_DATA_LEN - t_hlen; |
1897 | if (dev->type == ARPHRD_ETHER) |
1898 | dev->mtu -= ETH_HLEN; |
1899 | if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1900 | dev->mtu -= 8; |
1901 | |
1902 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1903 | ip6erspan_tnl_link_config(t: tunnel, set_mtu: 1); |
1904 | |
1905 | netdev_hold(dev, tracker: &tunnel->dev_tracker, GFP_KERNEL); |
1906 | return 0; |
1907 | |
1908 | cleanup_dst_cache_init: |
1909 | dst_cache_destroy(dst_cache: &tunnel->dst_cache); |
1910 | cleanup_alloc_pcpu_stats: |
1911 | free_percpu(pdata: dev->tstats); |
1912 | dev->tstats = NULL; |
1913 | return ret; |
1914 | } |
1915 | |
1916 | static const struct net_device_ops ip6erspan_netdev_ops = { |
1917 | .ndo_init = ip6erspan_tap_init, |
1918 | .ndo_uninit = ip6erspan_tunnel_uninit, |
1919 | .ndo_start_xmit = ip6erspan_tunnel_xmit, |
1920 | .ndo_set_mac_address = eth_mac_addr, |
1921 | .ndo_validate_addr = eth_validate_addr, |
1922 | .ndo_change_mtu = ip6_tnl_change_mtu, |
1923 | .ndo_get_stats64 = dev_get_tstats64, |
1924 | .ndo_get_iflink = ip6_tnl_get_iflink, |
1925 | }; |
1926 | |
1927 | static void ip6gre_tap_setup(struct net_device *dev) |
1928 | { |
1929 | |
1930 | ether_setup(dev); |
1931 | |
1932 | dev->max_mtu = 0; |
1933 | dev->netdev_ops = &ip6gre_tap_netdev_ops; |
1934 | dev->needs_free_netdev = true; |
1935 | dev->priv_destructor = ip6gre_dev_free; |
1936 | |
1937 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
1938 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
1939 | netif_keep_dst(dev); |
1940 | } |
1941 | |
1942 | static bool ip6gre_netlink_encap_parms(struct nlattr *data[], |
1943 | struct ip_tunnel_encap *ipencap) |
1944 | { |
1945 | bool ret = false; |
1946 | |
1947 | memset(ipencap, 0, sizeof(*ipencap)); |
1948 | |
1949 | if (!data) |
1950 | return ret; |
1951 | |
1952 | if (data[IFLA_GRE_ENCAP_TYPE]) { |
1953 | ret = true; |
1954 | ipencap->type = nla_get_u16(nla: data[IFLA_GRE_ENCAP_TYPE]); |
1955 | } |
1956 | |
1957 | if (data[IFLA_GRE_ENCAP_FLAGS]) { |
1958 | ret = true; |
1959 | ipencap->flags = nla_get_u16(nla: data[IFLA_GRE_ENCAP_FLAGS]); |
1960 | } |
1961 | |
1962 | if (data[IFLA_GRE_ENCAP_SPORT]) { |
1963 | ret = true; |
1964 | ipencap->sport = nla_get_be16(nla: data[IFLA_GRE_ENCAP_SPORT]); |
1965 | } |
1966 | |
1967 | if (data[IFLA_GRE_ENCAP_DPORT]) { |
1968 | ret = true; |
1969 | ipencap->dport = nla_get_be16(nla: data[IFLA_GRE_ENCAP_DPORT]); |
1970 | } |
1971 | |
1972 | return ret; |
1973 | } |
1974 | |
1975 | static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, |
1976 | struct nlattr *tb[], struct nlattr *data[], |
1977 | struct netlink_ext_ack *extack) |
1978 | { |
1979 | struct ip6_tnl *nt; |
1980 | struct ip_tunnel_encap ipencap; |
1981 | int err; |
1982 | |
1983 | nt = netdev_priv(dev); |
1984 | |
1985 | if (ip6gre_netlink_encap_parms(data, ipencap: &ipencap)) { |
1986 | int err = ip6_tnl_encap_setup(t: nt, ipencap: &ipencap); |
1987 | |
1988 | if (err < 0) |
1989 | return err; |
1990 | } |
1991 | |
1992 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
1993 | eth_hw_addr_random(dev); |
1994 | |
1995 | nt->dev = dev; |
1996 | nt->net = dev_net(dev); |
1997 | |
1998 | err = register_netdevice(dev); |
1999 | if (err) |
2000 | goto out; |
2001 | |
2002 | if (tb[IFLA_MTU]) |
2003 | ip6_tnl_change_mtu(dev, new_mtu: nla_get_u32(nla: tb[IFLA_MTU])); |
2004 | |
2005 | out: |
2006 | return err; |
2007 | } |
2008 | |
2009 | static int ip6gre_newlink(struct net *src_net, struct net_device *dev, |
2010 | struct nlattr *tb[], struct nlattr *data[], |
2011 | struct netlink_ext_ack *extack) |
2012 | { |
2013 | struct ip6_tnl *nt = netdev_priv(dev); |
2014 | struct net *net = dev_net(dev); |
2015 | struct ip6gre_net *ign; |
2016 | int err; |
2017 | |
2018 | ip6gre_netlink_parms(data, parms: &nt->parms); |
2019 | ign = net_generic(net, id: ip6gre_net_id); |
2020 | |
2021 | if (nt->parms.collect_md) { |
2022 | if (rtnl_dereference(ign->collect_md_tun)) |
2023 | return -EEXIST; |
2024 | } else { |
2025 | if (ip6gre_tunnel_find(net, parms: &nt->parms, type: dev->type)) |
2026 | return -EEXIST; |
2027 | } |
2028 | |
2029 | err = ip6gre_newlink_common(src_net, dev, tb, data, extack); |
2030 | if (!err) { |
2031 | ip6gre_tnl_link_config(t: nt, set_mtu: !tb[IFLA_MTU]); |
2032 | ip6gre_tunnel_link_md(ign, t: nt); |
2033 | ip6gre_tunnel_link(ign: net_generic(net, id: ip6gre_net_id), t: nt); |
2034 | } |
2035 | return err; |
2036 | } |
2037 | |
2038 | static struct ip6_tnl * |
2039 | ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], |
2040 | struct nlattr *data[], struct __ip6_tnl_parm *p_p, |
2041 | struct netlink_ext_ack *extack) |
2042 | { |
2043 | struct ip6_tnl *t, *nt = netdev_priv(dev); |
2044 | struct net *net = nt->net; |
2045 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
2046 | struct ip_tunnel_encap ipencap; |
2047 | |
2048 | if (dev == ign->fb_tunnel_dev) |
2049 | return ERR_PTR(error: -EINVAL); |
2050 | |
2051 | if (ip6gre_netlink_encap_parms(data, ipencap: &ipencap)) { |
2052 | int err = ip6_tnl_encap_setup(t: nt, ipencap: &ipencap); |
2053 | |
2054 | if (err < 0) |
2055 | return ERR_PTR(error: err); |
2056 | } |
2057 | |
2058 | ip6gre_netlink_parms(data, parms: p_p); |
2059 | |
2060 | t = ip6gre_tunnel_locate(net, parms: p_p, create: 0); |
2061 | |
2062 | if (t) { |
2063 | if (t->dev != dev) |
2064 | return ERR_PTR(error: -EEXIST); |
2065 | } else { |
2066 | t = nt; |
2067 | } |
2068 | |
2069 | return t; |
2070 | } |
2071 | |
2072 | static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], |
2073 | struct nlattr *data[], |
2074 | struct netlink_ext_ack *extack) |
2075 | { |
2076 | struct ip6_tnl *t = netdev_priv(dev); |
2077 | struct ip6gre_net *ign = net_generic(net: t->net, id: ip6gre_net_id); |
2078 | struct __ip6_tnl_parm p; |
2079 | |
2080 | t = ip6gre_changelink_common(dev, tb, data, p_p: &p, extack); |
2081 | if (IS_ERR(ptr: t)) |
2082 | return PTR_ERR(ptr: t); |
2083 | |
2084 | ip6gre_tunnel_unlink_md(ign, t); |
2085 | ip6gre_tunnel_unlink(ign, t); |
2086 | ip6gre_tnl_change(t, p: &p, set_mtu: !tb[IFLA_MTU]); |
2087 | ip6gre_tunnel_link_md(ign, t); |
2088 | ip6gre_tunnel_link(ign, t); |
2089 | return 0; |
2090 | } |
2091 | |
2092 | static void ip6gre_dellink(struct net_device *dev, struct list_head *head) |
2093 | { |
2094 | struct net *net = dev_net(dev); |
2095 | struct ip6gre_net *ign = net_generic(net, id: ip6gre_net_id); |
2096 | |
2097 | if (dev != ign->fb_tunnel_dev) |
2098 | unregister_netdevice_queue(dev, head); |
2099 | } |
2100 | |
2101 | static size_t ip6gre_get_size(const struct net_device *dev) |
2102 | { |
2103 | return |
2104 | /* IFLA_GRE_LINK */ |
2105 | nla_total_size(payload: 4) + |
2106 | /* IFLA_GRE_IFLAGS */ |
2107 | nla_total_size(payload: 2) + |
2108 | /* IFLA_GRE_OFLAGS */ |
2109 | nla_total_size(payload: 2) + |
2110 | /* IFLA_GRE_IKEY */ |
2111 | nla_total_size(payload: 4) + |
2112 | /* IFLA_GRE_OKEY */ |
2113 | nla_total_size(payload: 4) + |
2114 | /* IFLA_GRE_LOCAL */ |
2115 | nla_total_size(payload: sizeof(struct in6_addr)) + |
2116 | /* IFLA_GRE_REMOTE */ |
2117 | nla_total_size(payload: sizeof(struct in6_addr)) + |
2118 | /* IFLA_GRE_TTL */ |
2119 | nla_total_size(payload: 1) + |
2120 | /* IFLA_GRE_ENCAP_LIMIT */ |
2121 | nla_total_size(payload: 1) + |
2122 | /* IFLA_GRE_FLOWINFO */ |
2123 | nla_total_size(payload: 4) + |
2124 | /* IFLA_GRE_FLAGS */ |
2125 | nla_total_size(payload: 4) + |
2126 | /* IFLA_GRE_ENCAP_TYPE */ |
2127 | nla_total_size(payload: 2) + |
2128 | /* IFLA_GRE_ENCAP_FLAGS */ |
2129 | nla_total_size(payload: 2) + |
2130 | /* IFLA_GRE_ENCAP_SPORT */ |
2131 | nla_total_size(payload: 2) + |
2132 | /* IFLA_GRE_ENCAP_DPORT */ |
2133 | nla_total_size(payload: 2) + |
2134 | /* IFLA_GRE_COLLECT_METADATA */ |
2135 | nla_total_size(payload: 0) + |
2136 | /* IFLA_GRE_FWMARK */ |
2137 | nla_total_size(payload: 4) + |
2138 | /* IFLA_GRE_ERSPAN_INDEX */ |
2139 | nla_total_size(payload: 4) + |
2140 | 0; |
2141 | } |
2142 | |
2143 | static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
2144 | { |
2145 | struct ip6_tnl *t = netdev_priv(dev); |
2146 | struct __ip6_tnl_parm *p = &t->parms; |
2147 | __be16 o_flags = p->o_flags; |
2148 | |
2149 | if (p->erspan_ver == 1 || p->erspan_ver == 2) { |
2150 | if (!p->collect_md) |
2151 | o_flags |= TUNNEL_KEY; |
2152 | |
2153 | if (nla_put_u8(skb, attrtype: IFLA_GRE_ERSPAN_VER, value: p->erspan_ver)) |
2154 | goto nla_put_failure; |
2155 | |
2156 | if (p->erspan_ver == 1) { |
2157 | if (nla_put_u32(skb, attrtype: IFLA_GRE_ERSPAN_INDEX, value: p->index)) |
2158 | goto nla_put_failure; |
2159 | } else { |
2160 | if (nla_put_u8(skb, attrtype: IFLA_GRE_ERSPAN_DIR, value: p->dir)) |
2161 | goto nla_put_failure; |
2162 | if (nla_put_u16(skb, attrtype: IFLA_GRE_ERSPAN_HWID, value: p->hwid)) |
2163 | goto nla_put_failure; |
2164 | } |
2165 | } |
2166 | |
2167 | if (nla_put_u32(skb, attrtype: IFLA_GRE_LINK, value: p->link) || |
2168 | nla_put_be16(skb, attrtype: IFLA_GRE_IFLAGS, |
2169 | value: gre_tnl_flags_to_gre_flags(tflags: p->i_flags)) || |
2170 | nla_put_be16(skb, attrtype: IFLA_GRE_OFLAGS, |
2171 | value: gre_tnl_flags_to_gre_flags(tflags: o_flags)) || |
2172 | nla_put_be32(skb, attrtype: IFLA_GRE_IKEY, value: p->i_key) || |
2173 | nla_put_be32(skb, attrtype: IFLA_GRE_OKEY, value: p->o_key) || |
2174 | nla_put_in6_addr(skb, attrtype: IFLA_GRE_LOCAL, addr: &p->laddr) || |
2175 | nla_put_in6_addr(skb, attrtype: IFLA_GRE_REMOTE, addr: &p->raddr) || |
2176 | nla_put_u8(skb, attrtype: IFLA_GRE_TTL, value: p->hop_limit) || |
2177 | nla_put_u8(skb, attrtype: IFLA_GRE_ENCAP_LIMIT, value: p->encap_limit) || |
2178 | nla_put_be32(skb, attrtype: IFLA_GRE_FLOWINFO, value: p->flowinfo) || |
2179 | nla_put_u32(skb, attrtype: IFLA_GRE_FLAGS, value: p->flags) || |
2180 | nla_put_u32(skb, attrtype: IFLA_GRE_FWMARK, value: p->fwmark)) |
2181 | goto nla_put_failure; |
2182 | |
2183 | if (nla_put_u16(skb, attrtype: IFLA_GRE_ENCAP_TYPE, |
2184 | value: t->encap.type) || |
2185 | nla_put_be16(skb, attrtype: IFLA_GRE_ENCAP_SPORT, |
2186 | value: t->encap.sport) || |
2187 | nla_put_be16(skb, attrtype: IFLA_GRE_ENCAP_DPORT, |
2188 | value: t->encap.dport) || |
2189 | nla_put_u16(skb, attrtype: IFLA_GRE_ENCAP_FLAGS, |
2190 | value: t->encap.flags)) |
2191 | goto nla_put_failure; |
2192 | |
2193 | if (p->collect_md) { |
2194 | if (nla_put_flag(skb, attrtype: IFLA_GRE_COLLECT_METADATA)) |
2195 | goto nla_put_failure; |
2196 | } |
2197 | |
2198 | return 0; |
2199 | |
2200 | nla_put_failure: |
2201 | return -EMSGSIZE; |
2202 | } |
2203 | |
2204 | static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { |
2205 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
2206 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
2207 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
2208 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
2209 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
2210 | [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, |
2211 | [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, |
2212 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
2213 | [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, |
2214 | [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, |
2215 | [IFLA_GRE_FLAGS] = { .type = NLA_U32 }, |
2216 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
2217 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, |
2218 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, |
2219 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, |
2220 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
2221 | [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
2222 | [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
2223 | [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, |
2224 | [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, |
2225 | [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, |
2226 | }; |
2227 | |
2228 | static void ip6erspan_tap_setup(struct net_device *dev) |
2229 | { |
2230 | ether_setup(dev); |
2231 | |
2232 | dev->max_mtu = 0; |
2233 | dev->netdev_ops = &ip6erspan_netdev_ops; |
2234 | dev->needs_free_netdev = true; |
2235 | dev->priv_destructor = ip6gre_dev_free; |
2236 | |
2237 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
2238 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
2239 | netif_keep_dst(dev); |
2240 | } |
2241 | |
2242 | static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, |
2243 | struct nlattr *tb[], struct nlattr *data[], |
2244 | struct netlink_ext_ack *extack) |
2245 | { |
2246 | struct ip6_tnl *nt = netdev_priv(dev); |
2247 | struct net *net = dev_net(dev); |
2248 | struct ip6gre_net *ign; |
2249 | int err; |
2250 | |
2251 | ip6gre_netlink_parms(data, parms: &nt->parms); |
2252 | ip6erspan_set_version(data, parms: &nt->parms); |
2253 | ign = net_generic(net, id: ip6gre_net_id); |
2254 | |
2255 | if (nt->parms.collect_md) { |
2256 | if (rtnl_dereference(ign->collect_md_tun_erspan)) |
2257 | return -EEXIST; |
2258 | } else { |
2259 | if (ip6gre_tunnel_find(net, parms: &nt->parms, type: dev->type)) |
2260 | return -EEXIST; |
2261 | } |
2262 | |
2263 | err = ip6gre_newlink_common(src_net, dev, tb, data, extack); |
2264 | if (!err) { |
2265 | ip6erspan_tnl_link_config(t: nt, set_mtu: !tb[IFLA_MTU]); |
2266 | ip6erspan_tunnel_link_md(ign, t: nt); |
2267 | ip6gre_tunnel_link(ign: net_generic(net, id: ip6gre_net_id), t: nt); |
2268 | } |
2269 | return err; |
2270 | } |
2271 | |
2272 | static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) |
2273 | { |
2274 | ip6gre_tnl_link_config_common(t); |
2275 | ip6gre_tnl_link_config_route(t, set_mtu, t_hlen: ip6erspan_calc_hlen(tunnel: t)); |
2276 | } |
2277 | |
2278 | static int ip6erspan_tnl_change(struct ip6_tnl *t, |
2279 | const struct __ip6_tnl_parm *p, int set_mtu) |
2280 | { |
2281 | ip6gre_tnl_copy_tnl_parm(t, p); |
2282 | ip6erspan_tnl_link_config(t, set_mtu); |
2283 | return 0; |
2284 | } |
2285 | |
2286 | static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], |
2287 | struct nlattr *data[], |
2288 | struct netlink_ext_ack *extack) |
2289 | { |
2290 | struct ip6gre_net *ign = net_generic(net: dev_net(dev), id: ip6gre_net_id); |
2291 | struct __ip6_tnl_parm p; |
2292 | struct ip6_tnl *t; |
2293 | |
2294 | t = ip6gre_changelink_common(dev, tb, data, p_p: &p, extack); |
2295 | if (IS_ERR(ptr: t)) |
2296 | return PTR_ERR(ptr: t); |
2297 | |
2298 | ip6erspan_set_version(data, parms: &p); |
2299 | ip6gre_tunnel_unlink_md(ign, t); |
2300 | ip6gre_tunnel_unlink(ign, t); |
2301 | ip6erspan_tnl_change(t, p: &p, set_mtu: !tb[IFLA_MTU]); |
2302 | ip6erspan_tunnel_link_md(ign, t); |
2303 | ip6gre_tunnel_link(ign, t); |
2304 | return 0; |
2305 | } |
2306 | |
2307 | static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { |
2308 | .kind = "ip6gre" , |
2309 | .maxtype = IFLA_GRE_MAX, |
2310 | .policy = ip6gre_policy, |
2311 | .priv_size = sizeof(struct ip6_tnl), |
2312 | .setup = ip6gre_tunnel_setup, |
2313 | .validate = ip6gre_tunnel_validate, |
2314 | .newlink = ip6gre_newlink, |
2315 | .changelink = ip6gre_changelink, |
2316 | .dellink = ip6gre_dellink, |
2317 | .get_size = ip6gre_get_size, |
2318 | .fill_info = ip6gre_fill_info, |
2319 | .get_link_net = ip6_tnl_get_link_net, |
2320 | }; |
2321 | |
2322 | static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { |
2323 | .kind = "ip6gretap" , |
2324 | .maxtype = IFLA_GRE_MAX, |
2325 | .policy = ip6gre_policy, |
2326 | .priv_size = sizeof(struct ip6_tnl), |
2327 | .setup = ip6gre_tap_setup, |
2328 | .validate = ip6gre_tap_validate, |
2329 | .newlink = ip6gre_newlink, |
2330 | .changelink = ip6gre_changelink, |
2331 | .get_size = ip6gre_get_size, |
2332 | .fill_info = ip6gre_fill_info, |
2333 | .get_link_net = ip6_tnl_get_link_net, |
2334 | }; |
2335 | |
2336 | static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { |
2337 | .kind = "ip6erspan" , |
2338 | .maxtype = IFLA_GRE_MAX, |
2339 | .policy = ip6gre_policy, |
2340 | .priv_size = sizeof(struct ip6_tnl), |
2341 | .setup = ip6erspan_tap_setup, |
2342 | .validate = ip6erspan_tap_validate, |
2343 | .newlink = ip6erspan_newlink, |
2344 | .changelink = ip6erspan_changelink, |
2345 | .get_size = ip6gre_get_size, |
2346 | .fill_info = ip6gre_fill_info, |
2347 | .get_link_net = ip6_tnl_get_link_net, |
2348 | }; |
2349 | |
2350 | /* |
2351 | * And now the modules code and kernel interface. |
2352 | */ |
2353 | |
2354 | static int __init ip6gre_init(void) |
2355 | { |
2356 | int err; |
2357 | |
2358 | pr_info("GRE over IPv6 tunneling driver\n" ); |
2359 | |
2360 | err = register_pernet_device(&ip6gre_net_ops); |
2361 | if (err < 0) |
2362 | return err; |
2363 | |
2364 | err = inet6_add_protocol(prot: &ip6gre_protocol, IPPROTO_GRE); |
2365 | if (err < 0) { |
2366 | pr_info("%s: can't add protocol\n" , __func__); |
2367 | goto add_proto_failed; |
2368 | } |
2369 | |
2370 | err = rtnl_link_register(ops: &ip6gre_link_ops); |
2371 | if (err < 0) |
2372 | goto rtnl_link_failed; |
2373 | |
2374 | err = rtnl_link_register(ops: &ip6gre_tap_ops); |
2375 | if (err < 0) |
2376 | goto tap_ops_failed; |
2377 | |
2378 | err = rtnl_link_register(ops: &ip6erspan_tap_ops); |
2379 | if (err < 0) |
2380 | goto erspan_link_failed; |
2381 | |
2382 | out: |
2383 | return err; |
2384 | |
2385 | erspan_link_failed: |
2386 | rtnl_link_unregister(ops: &ip6gre_tap_ops); |
2387 | tap_ops_failed: |
2388 | rtnl_link_unregister(ops: &ip6gre_link_ops); |
2389 | rtnl_link_failed: |
2390 | inet6_del_protocol(prot: &ip6gre_protocol, IPPROTO_GRE); |
2391 | add_proto_failed: |
2392 | unregister_pernet_device(&ip6gre_net_ops); |
2393 | goto out; |
2394 | } |
2395 | |
2396 | static void __exit ip6gre_fini(void) |
2397 | { |
2398 | rtnl_link_unregister(ops: &ip6gre_tap_ops); |
2399 | rtnl_link_unregister(ops: &ip6gre_link_ops); |
2400 | rtnl_link_unregister(ops: &ip6erspan_tap_ops); |
2401 | inet6_del_protocol(prot: &ip6gre_protocol, IPPROTO_GRE); |
2402 | unregister_pernet_device(&ip6gre_net_ops); |
2403 | } |
2404 | |
2405 | module_init(ip6gre_init); |
2406 | module_exit(ip6gre_fini); |
2407 | MODULE_LICENSE("GPL" ); |
2408 | MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)" ); |
2409 | MODULE_DESCRIPTION("GRE over IPv6 tunneling device" ); |
2410 | MODULE_ALIAS_RTNL_LINK("ip6gre" ); |
2411 | MODULE_ALIAS_RTNL_LINK("ip6gretap" ); |
2412 | MODULE_ALIAS_RTNL_LINK("ip6erspan" ); |
2413 | MODULE_ALIAS_NETDEV("ip6gre0" ); |
2414 | |