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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
e905a9ed | 3 | * Linux NET3: GRE over IP protocol decoder. |
1da177e4 LT |
4 | * |
5 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) | |
1da177e4 LT |
6 | */ |
7 | ||
afd46503 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
4fc268d2 | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> | |
1da177e4 | 13 | #include <linux/kernel.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
7c0f6ba6 | 15 | #include <linux/uaccess.h> |
1da177e4 LT |
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> | |
2e15ea39 | 22 | #include <linux/if_vlan.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/in6.h> | |
25 | #include <linux/inetdevice.h> | |
26 | #include <linux/igmp.h> | |
27 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 28 | #include <linux/etherdevice.h> |
46f25dff | 29 | #include <linux/if_ether.h> |
1da177e4 LT |
30 | |
31 | #include <net/sock.h> | |
32 | #include <net/ip.h> | |
33 | #include <net/icmp.h> | |
34 | #include <net/protocol.h> | |
c5441932 | 35 | #include <net/ip_tunnels.h> |
1da177e4 LT |
36 | #include <net/arp.h> |
37 | #include <net/checksum.h> | |
38 | #include <net/dsfield.h> | |
39 | #include <net/inet_ecn.h> | |
40 | #include <net/xfrm.h> | |
59a4c759 PE |
41 | #include <net/net_namespace.h> |
42 | #include <net/netns/generic.h> | |
c19e654d | 43 | #include <net/rtnetlink.h> |
00959ade | 44 | #include <net/gre.h> |
2e15ea39 | 45 | #include <net/dst_metadata.h> |
84e54fe0 | 46 | #include <net/erspan.h> |
1da177e4 | 47 | |
1da177e4 LT |
48 | /* |
49 | Problems & solutions | |
50 | -------------------- | |
51 | ||
52 | 1. The most important issue is detecting local dead loops. | |
53 | They would cause complete host lockup in transmit, which | |
54 | would be "resolved" by stack overflow or, if queueing is enabled, | |
55 | with infinite looping in net_bh. | |
56 | ||
57 | We cannot track such dead loops during route installation, | |
58 | it is infeasible task. The most general solutions would be | |
59 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 60 | and silently drop packet when it expires. It is a good |
bff52857 | 61 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
62 | skb, even if no tunneling is used. |
63 | ||
6d0722a2 ED |
64 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
65 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
66 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
67 | |
68 | 2. Networking dead loops would not kill routers, but would really | |
69 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
70 | if we copy it from packet being encapsulated to upper header. | |
71 | It is very good solution, but it introduces two problems: | |
72 | ||
73 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
74 | do not work over tunnels. | |
75 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
76 | so that this problem would be solved and traceroute output | |
77 | would even more informative. This idea appeared to be wrong: | |
78 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
79 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
80 | return only 8 bytes of payload. It is the end. | |
81 | ||
82 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
83 | we should search for another solution. | |
84 | ||
85 | One of them is to parse packet trying to detect inner encapsulation | |
86 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 87 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
88 | |
89 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
90 | We force DF flag on tunnels with preconfigured hop limit, | |
91 | that is ALL. :-) Well, it does not remove the problem completely, | |
92 | but exponential growth of network traffic is changed to linear | |
93 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 94 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
95 | Yes, it is not good if there exists a router in the loop, |
96 | which does not force DF, even when encapsulating packets have DF set. | |
97 | But it is not our problem! Nobody could accuse us, we made | |
98 | all that we could make. Even if it is your gated who injected | |
99 | fatal route to network, even if it were you who configured | |
100 | fatal static route: you are innocent. :-) | |
101 | ||
1da177e4 LT |
102 | Alexey Kuznetsov. |
103 | */ | |
104 | ||
eccc1bb8 | 105 | static bool log_ecn_error = true; |
106 | module_param(log_ecn_error, bool, 0644); | |
107 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
108 | ||
c19e654d | 109 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
aab1e898 GN |
110 | static const struct header_ops ipgre_header_ops; |
111 | ||
1da177e4 | 112 | static int ipgre_tunnel_init(struct net_device *dev); |
1a66a836 | 113 | static void erspan_build_header(struct sk_buff *skb, |
c69de58b | 114 | u32 id, u32 index, |
a3222dc9 | 115 | bool truncate, bool is_ipv4); |
eb8ce741 | 116 | |
c7d03a00 AD |
117 | static unsigned int ipgre_net_id __read_mostly; |
118 | static unsigned int gre_tap_net_id __read_mostly; | |
84e54fe0 | 119 | static unsigned int erspan_net_id __read_mostly; |
1da177e4 | 120 | |
32bbd879 SB |
121 | static int ipgre_err(struct sk_buff *skb, u32 info, |
122 | const struct tnl_ptk_info *tpi) | |
1da177e4 | 123 | { |
1da177e4 | 124 | |
c5441932 PS |
125 | /* All the routers (except for Linux) return only |
126 | 8 bytes of packet payload. It means, that precise relaying of | |
127 | ICMP in the real Internet is absolutely infeasible. | |
1da177e4 | 128 | |
c5441932 PS |
129 | Moreover, Cisco "wise men" put GRE key to the third word |
130 | in GRE header. It makes impossible maintaining even soft | |
131 | state for keyed GRE tunnels with enabled checksum. Tell | |
132 | them "thank you". | |
1da177e4 | 133 | |
c5441932 PS |
134 | Well, I wonder, rfc1812 was written by Cisco employee, |
135 | what the hell these idiots break standards established | |
136 | by themselves??? | |
137 | */ | |
138 | struct net *net = dev_net(skb->dev); | |
139 | struct ip_tunnel_net *itn; | |
96f5a846 | 140 | const struct iphdr *iph; |
88c7664f ACM |
141 | const int type = icmp_hdr(skb)->type; |
142 | const int code = icmp_hdr(skb)->code; | |
20e1954f | 143 | unsigned int data_len = 0; |
1da177e4 | 144 | struct ip_tunnel *t; |
1da177e4 | 145 | |
32bbd879 SB |
146 | if (tpi->proto == htons(ETH_P_TEB)) |
147 | itn = net_generic(net, gre_tap_net_id); | |
148 | else if (tpi->proto == htons(ETH_P_ERSPAN) || | |
149 | tpi->proto == htons(ETH_P_ERSPAN2)) | |
150 | itn = net_generic(net, erspan_net_id); | |
151 | else | |
152 | itn = net_generic(net, ipgre_net_id); | |
153 | ||
154 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); | |
155 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, | |
156 | iph->daddr, iph->saddr, tpi->key); | |
157 | ||
158 | if (!t) | |
159 | return -ENOENT; | |
160 | ||
1da177e4 LT |
161 | switch (type) { |
162 | default: | |
163 | case ICMP_PARAMETERPROB: | |
32bbd879 | 164 | return 0; |
1da177e4 LT |
165 | |
166 | case ICMP_DEST_UNREACH: | |
167 | switch (code) { | |
168 | case ICMP_SR_FAILED: | |
169 | case ICMP_PORT_UNREACH: | |
170 | /* Impossible event. */ | |
32bbd879 | 171 | return 0; |
1da177e4 LT |
172 | default: |
173 | /* All others are translated to HOST_UNREACH. | |
174 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
175 | I believe they are just ether pollution. --ANK | |
176 | */ | |
177 | break; | |
178 | } | |
179 | break; | |
9f57c67c | 180 | |
1da177e4 LT |
181 | case ICMP_TIME_EXCEEDED: |
182 | if (code != ICMP_EXC_TTL) | |
32bbd879 | 183 | return 0; |
20e1954f | 184 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
1da177e4 | 185 | break; |
55be7a9c DM |
186 | |
187 | case ICMP_REDIRECT: | |
188 | break; | |
1da177e4 LT |
189 | } |
190 | ||
9b8c6d7b ED |
191 | #if IS_ENABLED(CONFIG_IPV6) |
192 | if (tpi->proto == htons(ETH_P_IPV6) && | |
20e1954f ED |
193 | !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, |
194 | type, data_len)) | |
32bbd879 | 195 | return 0; |
9b8c6d7b ED |
196 | #endif |
197 | ||
36393395 | 198 | if (t->parms.iph.daddr == 0 || |
f97c1e0c | 199 | ipv4_is_multicast(t->parms.iph.daddr)) |
32bbd879 | 200 | return 0; |
1da177e4 LT |
201 | |
202 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
32bbd879 | 203 | return 0; |
1da177e4 | 204 | |
da6185d8 | 205 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
206 | t->err_count++; |
207 | else | |
208 | t->err_count = 1; | |
209 | t->err_time = jiffies; | |
32bbd879 SB |
210 | |
211 | return 0; | |
9f57c67c PS |
212 | } |
213 | ||
214 | static void gre_err(struct sk_buff *skb, u32 info) | |
215 | { | |
216 | /* All the routers (except for Linux) return only | |
217 | * 8 bytes of packet payload. It means, that precise relaying of | |
218 | * ICMP in the real Internet is absolutely infeasible. | |
219 | * | |
220 | * Moreover, Cisco "wise men" put GRE key to the third word | |
221 | * in GRE header. It makes impossible maintaining even soft | |
222 | * state for keyed | |
223 | * GRE tunnels with enabled checksum. Tell them "thank you". | |
224 | * | |
225 | * Well, I wonder, rfc1812 was written by Cisco employee, | |
226 | * what the hell these idiots break standards established | |
227 | * by themselves??? | |
228 | */ | |
229 | ||
e582615a | 230 | const struct iphdr *iph = (struct iphdr *)skb->data; |
9f57c67c PS |
231 | const int type = icmp_hdr(skb)->type; |
232 | const int code = icmp_hdr(skb)->code; | |
233 | struct tnl_ptk_info tpi; | |
9f57c67c | 234 | |
b0350d51 HY |
235 | if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IP), |
236 | iph->ihl * 4) < 0) | |
237 | return; | |
9f57c67c PS |
238 | |
239 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { | |
240 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, | |
d888f396 | 241 | skb->dev->ifindex, IPPROTO_GRE); |
9f57c67c PS |
242 | return; |
243 | } | |
244 | if (type == ICMP_REDIRECT) { | |
1042caa7 MÅ» |
245 | ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, |
246 | IPPROTO_GRE); | |
9f57c67c PS |
247 | return; |
248 | } | |
249 | ||
250 | ipgre_err(skb, info, &tpi); | |
1da177e4 LT |
251 | } |
252 | ||
f989d546 WT |
253 | static bool is_erspan_type1(int gre_hdr_len) |
254 | { | |
255 | /* Both ERSPAN type I (version 0) and type II (version 1) use | |
256 | * protocol 0x88BE, but the type I has only 4-byte GRE header, | |
257 | * while type II has 8-byte. | |
258 | */ | |
259 | return gre_hdr_len == 4; | |
260 | } | |
261 | ||
84e54fe0 WT |
262 | static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
263 | int gre_hdr_len) | |
264 | { | |
265 | struct net *net = dev_net(skb->dev); | |
266 | struct metadata_dst *tun_dst = NULL; | |
1d7e2ed2 | 267 | struct erspan_base_hdr *ershdr; |
84e54fe0 WT |
268 | struct ip_tunnel_net *itn; |
269 | struct ip_tunnel *tunnel; | |
84e54fe0 | 270 | const struct iphdr *iph; |
3df19283 | 271 | struct erspan_md2 *md2; |
1d7e2ed2 | 272 | int ver; |
84e54fe0 WT |
273 | int len; |
274 | ||
275 | itn = net_generic(net, erspan_net_id); | |
84e54fe0 | 276 | iph = ip_hdr(skb); |
f989d546 WT |
277 | if (is_erspan_type1(gre_hdr_len)) { |
278 | ver = 0; | |
279 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, | |
280 | tpi->flags | TUNNEL_NO_KEY, | |
281 | iph->saddr, iph->daddr, 0); | |
282 | } else { | |
283 | ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len); | |
284 | ver = ershdr->ver; | |
285 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, | |
286 | tpi->flags | TUNNEL_KEY, | |
287 | iph->saddr, iph->daddr, tpi->key); | |
288 | } | |
84e54fe0 WT |
289 | |
290 | if (tunnel) { | |
f989d546 WT |
291 | if (is_erspan_type1(gre_hdr_len)) |
292 | len = gre_hdr_len; | |
293 | else | |
294 | len = gre_hdr_len + erspan_hdr_len(ver); | |
295 | ||
1d7e2ed2 | 296 | if (unlikely(!pskb_may_pull(skb, len))) |
ae3e1337 | 297 | return PACKET_REJECT; |
1d7e2ed2 | 298 | |
84e54fe0 | 299 | if (__iptunnel_pull_header(skb, |
1d7e2ed2 | 300 | len, |
84e54fe0 WT |
301 | htons(ETH_P_TEB), |
302 | false, false) < 0) | |
303 | goto drop; | |
304 | ||
1a66a836 | 305 | if (tunnel->collect_md) { |
492b67e2 | 306 | struct erspan_metadata *pkt_md, *md; |
1a66a836 | 307 | struct ip_tunnel_info *info; |
492b67e2 | 308 | unsigned char *gh; |
1a66a836 WT |
309 | __be64 tun_id; |
310 | __be16 flags; | |
311 | ||
312 | tpi->flags |= TUNNEL_KEY; | |
313 | flags = tpi->flags; | |
314 | tun_id = key32_to_tunnel_id(tpi->key); | |
315 | ||
316 | tun_dst = ip_tun_rx_dst(skb, flags, | |
317 | tun_id, sizeof(*md)); | |
318 | if (!tun_dst) | |
319 | return PACKET_REJECT; | |
320 | ||
492b67e2 LB |
321 | /* skb can be uncloned in __iptunnel_pull_header, so |
322 | * old pkt_md is no longer valid and we need to reset | |
323 | * it | |
324 | */ | |
325 | gh = skb_network_header(skb) + | |
326 | skb_network_header_len(skb); | |
327 | pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + | |
328 | sizeof(*ershdr)); | |
1a66a836 | 329 | md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
f551c91d | 330 | md->version = ver; |
3df19283 WT |
331 | md2 = &md->u.md2; |
332 | memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : | |
333 | ERSPAN_V2_MDSIZE); | |
f551c91d | 334 | |
1a66a836 WT |
335 | info = &tun_dst->u.tun_info; |
336 | info->key.tun_flags |= TUNNEL_ERSPAN_OPT; | |
337 | info->options_len = sizeof(*md); | |
1a66a836 WT |
338 | } |
339 | ||
84e54fe0 WT |
340 | skb_reset_mac_header(skb); |
341 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
342 | return PACKET_RCVD; | |
343 | } | |
5a64506b HY |
344 | return PACKET_REJECT; |
345 | ||
84e54fe0 WT |
346 | drop: |
347 | kfree_skb(skb); | |
348 | return PACKET_RCVD; | |
349 | } | |
350 | ||
125372fa JB |
351 | static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
352 | struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) | |
1da177e4 | 353 | { |
2e15ea39 | 354 | struct metadata_dst *tun_dst = NULL; |
b71d1d42 | 355 | const struct iphdr *iph; |
1da177e4 | 356 | struct ip_tunnel *tunnel; |
1da177e4 | 357 | |
c5441932 | 358 | iph = ip_hdr(skb); |
bda7bb46 PS |
359 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
360 | iph->saddr, iph->daddr, tpi->key); | |
e1a80002 | 361 | |
d2083287 | 362 | if (tunnel) { |
c0d59da7 | 363 | const struct iphdr *tnl_params; |
364 | ||
125372fa JB |
365 | if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, |
366 | raw_proto, false) < 0) | |
244a797b JB |
367 | goto drop; |
368 | ||
aab1e898 GN |
369 | /* Special case for ipgre_header_parse(), which expects the |
370 | * mac_header to point to the outer IP header. | |
371 | */ | |
372 | if (tunnel->dev->header_ops == &ipgre_header_ops) | |
e271c7b4 JB |
373 | skb_pop_mac_header(skb); |
374 | else | |
375 | skb_reset_mac_header(skb); | |
c0d59da7 | 376 | |
377 | tnl_params = &tunnel->parms.iph; | |
378 | if (tunnel->collect_md || tnl_params->daddr == 0) { | |
c29a70d2 PS |
379 | __be16 flags; |
380 | __be64 tun_id; | |
2e15ea39 | 381 | |
c29a70d2 | 382 | flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
d817f432 | 383 | tun_id = key32_to_tunnel_id(tpi->key); |
c29a70d2 | 384 | tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); |
2e15ea39 PS |
385 | if (!tun_dst) |
386 | return PACKET_REJECT; | |
2e15ea39 PS |
387 | } |
388 | ||
389 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); | |
bda7bb46 | 390 | return PACKET_RCVD; |
1da177e4 | 391 | } |
125372fa | 392 | return PACKET_NEXT; |
244a797b JB |
393 | |
394 | drop: | |
395 | kfree_skb(skb); | |
396 | return PACKET_RCVD; | |
1da177e4 LT |
397 | } |
398 | ||
125372fa JB |
399 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
400 | int hdr_len) | |
401 | { | |
402 | struct net *net = dev_net(skb->dev); | |
403 | struct ip_tunnel_net *itn; | |
404 | int res; | |
405 | ||
406 | if (tpi->proto == htons(ETH_P_TEB)) | |
407 | itn = net_generic(net, gre_tap_net_id); | |
408 | else | |
409 | itn = net_generic(net, ipgre_net_id); | |
410 | ||
411 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); | |
412 | if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { | |
413 | /* ipgre tunnels in collect metadata mode should receive | |
414 | * also ETH_P_TEB traffic. | |
415 | */ | |
416 | itn = net_generic(net, ipgre_net_id); | |
417 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); | |
418 | } | |
419 | return res; | |
420 | } | |
421 | ||
9f57c67c PS |
422 | static int gre_rcv(struct sk_buff *skb) |
423 | { | |
424 | struct tnl_ptk_info tpi; | |
425 | bool csum_err = false; | |
95f5c64c | 426 | int hdr_len; |
9f57c67c PS |
427 | |
428 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
429 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { | |
430 | /* Looped back packet, drop it! */ | |
431 | if (rt_is_output_route(skb_rtable(skb))) | |
432 | goto drop; | |
433 | } | |
434 | #endif | |
435 | ||
e582615a | 436 | hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0); |
f132ae7c | 437 | if (hdr_len < 0) |
95f5c64c TH |
438 | goto drop; |
439 | ||
f551c91d WT |
440 | if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || |
441 | tpi.proto == htons(ETH_P_ERSPAN2))) { | |
84e54fe0 WT |
442 | if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
443 | return 0; | |
dd8d5b8c | 444 | goto out; |
84e54fe0 WT |
445 | } |
446 | ||
244a797b | 447 | if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
9f57c67c PS |
448 | return 0; |
449 | ||
dd8d5b8c | 450 | out: |
9f57c67c PS |
451 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
452 | drop: | |
453 | kfree_skb(skb); | |
454 | return 0; | |
455 | } | |
456 | ||
c5441932 PS |
457 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
458 | const struct iphdr *tnl_params, | |
459 | __be16 proto) | |
460 | { | |
461 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1da177e4 | 462 | |
c5441932 PS |
463 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
464 | tunnel->o_seqno++; | |
1da177e4 | 465 | |
c5441932 | 466 | /* Push GRE header. */ |
182a352d TH |
467 | gre_build_header(skb, tunnel->tun_hlen, |
468 | tunnel->parms.o_flags, proto, tunnel->parms.o_key, | |
469 | htonl(tunnel->o_seqno)); | |
54bc9bac | 470 | |
bf3d6a8f | 471 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
c5441932 | 472 | } |
1da177e4 | 473 | |
aed069df | 474 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
b2acd1dc | 475 | { |
6fa79666 | 476 | return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
b2acd1dc PS |
477 | } |
478 | ||
862a03c3 WT |
479 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
480 | __be16 proto) | |
481 | { | |
77a5196a | 482 | struct ip_tunnel *tunnel = netdev_priv(dev); |
862a03c3 WT |
483 | struct ip_tunnel_info *tun_info; |
484 | const struct ip_tunnel_key *key; | |
862a03c3 | 485 | int tunnel_hlen; |
962924fa | 486 | __be16 flags; |
862a03c3 WT |
487 | |
488 | tun_info = skb_tunnel_info(skb); | |
489 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
490 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
491 | goto err_free_skb; | |
492 | ||
493 | key = &tun_info->key; | |
494 | tunnel_hlen = gre_calc_hlen(key->tun_flags); | |
495 | ||
962924fa | 496 | if (skb_cow_head(skb, dev->needed_headroom)) |
497 | goto err_free_skb; | |
2e15ea39 PS |
498 | |
499 | /* Push Tunnel header. */ | |
aed069df | 500 | if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) |
962924fa | 501 | goto err_free_skb; |
2e15ea39 | 502 | |
77a5196a WT |
503 | flags = tun_info->key.tun_flags & |
504 | (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); | |
cba65321 | 505 | gre_build_header(skb, tunnel_hlen, flags, proto, |
77a5196a | 506 | tunnel_id_to_key32(tun_info->key.tun_id), |
15746394 | 507 | (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0); |
2e15ea39 | 508 | |
962924fa | 509 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
039f5062 | 510 | |
2e15ea39 PS |
511 | return; |
512 | ||
2e15ea39 PS |
513 | err_free_skb: |
514 | kfree_skb(skb); | |
515 | dev->stats.tx_dropped++; | |
516 | } | |
517 | ||
20704bd1 | 518 | static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev) |
1a66a836 WT |
519 | { |
520 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
521 | struct ip_tunnel_info *tun_info; | |
522 | const struct ip_tunnel_key *key; | |
523 | struct erspan_metadata *md; | |
1a66a836 | 524 | bool truncate = false; |
962924fa | 525 | __be16 proto; |
1a66a836 | 526 | int tunnel_hlen; |
f551c91d | 527 | int version; |
1baf5ebf | 528 | int nhoff; |
d5db21a3 | 529 | int thoff; |
1a66a836 WT |
530 | |
531 | tun_info = skb_tunnel_info(skb); | |
532 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
533 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
534 | goto err_free_skb; | |
535 | ||
536 | key = &tun_info->key; | |
256c87c1 | 537 | if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) |
962924fa | 538 | goto err_free_skb; |
2eb8d6d2 | 539 | if (tun_info->options_len < sizeof(*md)) |
962924fa | 540 | goto err_free_skb; |
2eb8d6d2 | 541 | md = ip_tunnel_info_opts(tun_info); |
1a66a836 WT |
542 | |
543 | /* ERSPAN has fixed 8 byte GRE header */ | |
f551c91d WT |
544 | version = md->version; |
545 | tunnel_hlen = 8 + erspan_hdr_len(version); | |
1a66a836 | 546 | |
962924fa | 547 | if (skb_cow_head(skb, dev->needed_headroom)) |
548 | goto err_free_skb; | |
1a66a836 WT |
549 | |
550 | if (gre_handle_offloads(skb, false)) | |
962924fa | 551 | goto err_free_skb; |
1a66a836 | 552 | |
f192970d WT |
553 | if (skb->len > dev->mtu + dev->hard_header_len) { |
554 | pskb_trim(skb, dev->mtu + dev->hard_header_len); | |
1a66a836 WT |
555 | truncate = true; |
556 | } | |
557 | ||
1baf5ebf WT |
558 | nhoff = skb_network_header(skb) - skb_mac_header(skb); |
559 | if (skb->protocol == htons(ETH_P_IP) && | |
560 | (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) | |
561 | truncate = true; | |
d5db21a3 WT |
562 | |
563 | thoff = skb_transport_header(skb) - skb_mac_header(skb); | |
564 | if (skb->protocol == htons(ETH_P_IPV6) && | |
565 | (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) | |
566 | truncate = true; | |
1baf5ebf | 567 | |
f551c91d | 568 | if (version == 1) { |
c69de58b | 569 | erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)), |
f551c91d | 570 | ntohl(md->u.index), truncate, true); |
20704bd1 | 571 | proto = htons(ETH_P_ERSPAN); |
f551c91d | 572 | } else if (version == 2) { |
c69de58b WT |
573 | erspan_build_header_v2(skb, |
574 | ntohl(tunnel_id_to_key32(key->tun_id)), | |
575 | md->u.md2.dir, | |
576 | get_hwid(&md->u.md2), | |
577 | truncate, true); | |
20704bd1 | 578 | proto = htons(ETH_P_ERSPAN2); |
f551c91d | 579 | } else { |
962924fa | 580 | goto err_free_skb; |
f551c91d | 581 | } |
1a66a836 WT |
582 | |
583 | gre_build_header(skb, 8, TUNNEL_SEQ, | |
20704bd1 | 584 | proto, 0, htonl(tunnel->o_seqno++)); |
1a66a836 | 585 | |
962924fa | 586 | ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
1a66a836 | 587 | |
1a66a836 WT |
588 | return; |
589 | ||
1a66a836 WT |
590 | err_free_skb: |
591 | kfree_skb(skb); | |
592 | dev->stats.tx_dropped++; | |
593 | } | |
594 | ||
fc4099f1 PS |
595 | static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
596 | { | |
597 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
962924fa | 598 | const struct ip_tunnel_key *key; |
fc4099f1 PS |
599 | struct rtable *rt; |
600 | struct flowi4 fl4; | |
601 | ||
602 | if (ip_tunnel_info_af(info) != AF_INET) | |
603 | return -EINVAL; | |
604 | ||
962924fa | 605 | key = &info->key; |
606 | ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src, | |
d7541402 GN |
607 | tunnel_id_to_key32(key->tun_id), |
608 | key->tos & ~INET_ECN_MASK, 0, skb->mark, | |
609 | skb_get_hash(skb)); | |
962924fa | 610 | rt = ip_route_output_key(dev_net(dev), &fl4); |
fc4099f1 PS |
611 | if (IS_ERR(rt)) |
612 | return PTR_ERR(rt); | |
613 | ||
614 | ip_rt_put(rt); | |
615 | info->key.u.ipv4.src = fl4.saddr; | |
616 | return 0; | |
617 | } | |
618 | ||
c5441932 PS |
619 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
620 | struct net_device *dev) | |
621 | { | |
622 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
623 | const struct iphdr *tnl_params; | |
1da177e4 | 624 | |
cb9f1b78 WB |
625 | if (!pskb_inet_may_pull(skb)) |
626 | goto free_skb; | |
627 | ||
2e15ea39 | 628 | if (tunnel->collect_md) { |
2090714e | 629 | gre_fb_xmit(skb, dev, skb->protocol); |
2e15ea39 PS |
630 | return NETDEV_TX_OK; |
631 | } | |
632 | ||
c5441932 | 633 | if (dev->header_ops) { |
8a0ed250 WB |
634 | const int pull_len = tunnel->hlen + sizeof(struct iphdr); |
635 | ||
fdafed45 | 636 | if (skb_cow_head(skb, 0)) |
c5441932 | 637 | goto free_skb; |
1da177e4 | 638 | |
c5441932 | 639 | tnl_params = (const struct iphdr *)skb->data; |
1da177e4 | 640 | |
8a0ed250 WB |
641 | if (pull_len > skb_transport_offset(skb)) |
642 | goto free_skb; | |
643 | ||
c5441932 PS |
644 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
645 | * to gre header. | |
646 | */ | |
8a0ed250 | 647 | skb_pull(skb, pull_len); |
8a0033a9 | 648 | skb_reset_mac_header(skb); |
c5441932 PS |
649 | } else { |
650 | if (skb_cow_head(skb, dev->needed_headroom)) | |
651 | goto free_skb; | |
1da177e4 | 652 | |
c5441932 | 653 | tnl_params = &tunnel->parms.iph; |
1da177e4 LT |
654 | } |
655 | ||
aed069df AD |
656 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
657 | goto free_skb; | |
8a0033a9 | 658 | |
c5441932 | 659 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
6ed10654 | 660 | return NETDEV_TX_OK; |
1da177e4 | 661 | |
c5441932 | 662 | free_skb: |
3acfa1e7 | 663 | kfree_skb(skb); |
c5441932 | 664 | dev->stats.tx_dropped++; |
6ed10654 | 665 | return NETDEV_TX_OK; |
1da177e4 LT |
666 | } |
667 | ||
84e54fe0 WT |
668 | static netdev_tx_t erspan_xmit(struct sk_buff *skb, |
669 | struct net_device *dev) | |
670 | { | |
671 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
672 | bool truncate = false; | |
20704bd1 | 673 | __be16 proto; |
84e54fe0 | 674 | |
cb9f1b78 WB |
675 | if (!pskb_inet_may_pull(skb)) |
676 | goto free_skb; | |
677 | ||
1a66a836 | 678 | if (tunnel->collect_md) { |
20704bd1 | 679 | erspan_fb_xmit(skb, dev); |
1a66a836 WT |
680 | return NETDEV_TX_OK; |
681 | } | |
682 | ||
84e54fe0 WT |
683 | if (gre_handle_offloads(skb, false)) |
684 | goto free_skb; | |
685 | ||
686 | if (skb_cow_head(skb, dev->needed_headroom)) | |
687 | goto free_skb; | |
688 | ||
f192970d WT |
689 | if (skb->len > dev->mtu + dev->hard_header_len) { |
690 | pskb_trim(skb, dev->mtu + dev->hard_header_len); | |
84e54fe0 WT |
691 | truncate = true; |
692 | } | |
693 | ||
694 | /* Push ERSPAN header */ | |
f989d546 WT |
695 | if (tunnel->erspan_ver == 0) { |
696 | proto = htons(ETH_P_ERSPAN); | |
697 | tunnel->parms.o_flags &= ~TUNNEL_SEQ; | |
698 | } else if (tunnel->erspan_ver == 1) { | |
c69de58b WT |
699 | erspan_build_header(skb, ntohl(tunnel->parms.o_key), |
700 | tunnel->index, | |
f551c91d | 701 | truncate, true); |
20704bd1 XL |
702 | proto = htons(ETH_P_ERSPAN); |
703 | } else if (tunnel->erspan_ver == 2) { | |
c69de58b | 704 | erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key), |
f551c91d WT |
705 | tunnel->dir, tunnel->hwid, |
706 | truncate, true); | |
20704bd1 XL |
707 | proto = htons(ETH_P_ERSPAN2); |
708 | } else { | |
02f99df1 | 709 | goto free_skb; |
20704bd1 | 710 | } |
f551c91d | 711 | |
84e54fe0 | 712 | tunnel->parms.o_flags &= ~TUNNEL_KEY; |
20704bd1 | 713 | __gre_xmit(skb, dev, &tunnel->parms.iph, proto); |
84e54fe0 WT |
714 | return NETDEV_TX_OK; |
715 | ||
716 | free_skb: | |
717 | kfree_skb(skb); | |
718 | dev->stats.tx_dropped++; | |
719 | return NETDEV_TX_OK; | |
720 | } | |
721 | ||
c5441932 PS |
722 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
723 | struct net_device *dev) | |
ee34c1eb | 724 | { |
c5441932 | 725 | struct ip_tunnel *tunnel = netdev_priv(dev); |
ee34c1eb | 726 | |
cb9f1b78 WB |
727 | if (!pskb_inet_may_pull(skb)) |
728 | goto free_skb; | |
729 | ||
2e15ea39 | 730 | if (tunnel->collect_md) { |
2090714e | 731 | gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
2e15ea39 PS |
732 | return NETDEV_TX_OK; |
733 | } | |
734 | ||
aed069df AD |
735 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
736 | goto free_skb; | |
ee34c1eb | 737 | |
c5441932 PS |
738 | if (skb_cow_head(skb, dev->needed_headroom)) |
739 | goto free_skb; | |
42aa9162 | 740 | |
c5441932 | 741 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
c5441932 | 742 | return NETDEV_TX_OK; |
ee34c1eb | 743 | |
c5441932 | 744 | free_skb: |
3acfa1e7 | 745 | kfree_skb(skb); |
c5441932 PS |
746 | dev->stats.tx_dropped++; |
747 | return NETDEV_TX_OK; | |
ee34c1eb MS |
748 | } |
749 | ||
dd9d598c XL |
750 | static void ipgre_link_update(struct net_device *dev, bool set_mtu) |
751 | { | |
752 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
753 | int len; | |
754 | ||
755 | len = tunnel->tun_hlen; | |
756 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); | |
757 | len = tunnel->tun_hlen - len; | |
758 | tunnel->hlen = tunnel->hlen + len; | |
759 | ||
fdafed45 CW |
760 | if (dev->header_ops) |
761 | dev->hard_header_len += len; | |
762 | else | |
763 | dev->needed_headroom += len; | |
764 | ||
dd9d598c XL |
765 | if (set_mtu) |
766 | dev->mtu = max_t(int, dev->mtu - len, 68); | |
767 | ||
768 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
769 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
770 | tunnel->encap.type == TUNNEL_ENCAP_NONE) { | |
771 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
772 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1cc5954f SD |
773 | } else { |
774 | dev->features &= ~NETIF_F_GSO_SOFTWARE; | |
775 | dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
dd9d598c XL |
776 | } |
777 | dev->features |= NETIF_F_LLTX; | |
1cc5954f SD |
778 | } else { |
779 | dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
780 | dev->features &= ~(NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE); | |
dd9d598c XL |
781 | } |
782 | } | |
783 | ||
607259a6 CH |
784 | static int ipgre_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, |
785 | int cmd) | |
1da177e4 | 786 | { |
a0efab67 | 787 | int err; |
1da177e4 | 788 | |
6c734fb8 | 789 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
607259a6 CH |
790 | if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE || |
791 | p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)) || | |
792 | ((p->i_flags | p->o_flags) & (GRE_VERSION | GRE_ROUTING))) | |
6c734fb8 | 793 | return -EINVAL; |
1da177e4 | 794 | } |
a0efab67 | 795 | |
607259a6 CH |
796 | p->i_flags = gre_flags_to_tnl_flags(p->i_flags); |
797 | p->o_flags = gre_flags_to_tnl_flags(p->o_flags); | |
1da177e4 | 798 | |
607259a6 | 799 | err = ip_tunnel_ctl(dev, p, cmd); |
c5441932 PS |
800 | if (err) |
801 | return err; | |
1da177e4 | 802 | |
a0efab67 XL |
803 | if (cmd == SIOCCHGTUNNEL) { |
804 | struct ip_tunnel *t = netdev_priv(dev); | |
805 | ||
607259a6 CH |
806 | t->parms.i_flags = p->i_flags; |
807 | t->parms.o_flags = p->o_flags; | |
a0efab67 XL |
808 | |
809 | if (strcmp(dev->rtnl_link_ops->kind, "erspan")) | |
810 | ipgre_link_update(dev, true); | |
811 | } | |
812 | ||
607259a6 CH |
813 | p->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); |
814 | p->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); | |
1da177e4 LT |
815 | return 0; |
816 | } | |
817 | ||
1da177e4 LT |
818 | /* Nice toy. Unfortunately, useless in real life :-) |
819 | It allows to construct virtual multiprotocol broadcast "LAN" | |
820 | over the Internet, provided multicast routing is tuned. | |
821 | ||
822 | ||
823 | I have no idea was this bicycle invented before me, | |
824 | so that I had to set ARPHRD_IPGRE to a random value. | |
825 | I have an impression, that Cisco could make something similar, | |
826 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 827 | |
1da177e4 LT |
828 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
829 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
830 | ||
831 | ping -t 255 224.66.66.66 | |
832 | ||
833 | If nobody answers, mbone does not work. | |
834 | ||
835 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
836 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
837 | ifconfig Universe up | |
838 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
839 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
840 | ftp 10.66.66.66 | |
841 | ... | |
842 | ftp fec0:6666:6666::193.233.7.65 | |
843 | ... | |
1da177e4 | 844 | */ |
3b04ddde SH |
845 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
846 | unsigned short type, | |
1507850b | 847 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 848 | { |
2941a486 | 849 | struct ip_tunnel *t = netdev_priv(dev); |
c5441932 PS |
850 | struct iphdr *iph; |
851 | struct gre_base_hdr *greh; | |
1da177e4 | 852 | |
d58ff351 | 853 | iph = skb_push(skb, t->hlen + sizeof(*iph)); |
c5441932 | 854 | greh = (struct gre_base_hdr *)(iph+1); |
95f5c64c | 855 | greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags); |
c5441932 | 856 | greh->protocol = htons(type); |
1da177e4 | 857 | |
c5441932 | 858 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
e905a9ed | 859 | |
c5441932 | 860 | /* Set the source hardware address. */ |
1da177e4 LT |
861 | if (saddr) |
862 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 863 | if (daddr) |
1da177e4 | 864 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 865 | if (iph->daddr) |
77a482bd | 866 | return t->hlen + sizeof(*iph); |
e905a9ed | 867 | |
c5441932 | 868 | return -(t->hlen + sizeof(*iph)); |
1da177e4 LT |
869 | } |
870 | ||
6a5f44d7 TT |
871 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
872 | { | |
b71d1d42 | 873 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
874 | memcpy(haddr, &iph->saddr, 4); |
875 | return 4; | |
876 | } | |
877 | ||
3b04ddde SH |
878 | static const struct header_ops ipgre_header_ops = { |
879 | .create = ipgre_header, | |
6a5f44d7 | 880 | .parse = ipgre_header_parse, |
3b04ddde SH |
881 | }; |
882 | ||
6a5f44d7 | 883 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
884 | static int ipgre_open(struct net_device *dev) |
885 | { | |
2941a486 | 886 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 887 | |
f97c1e0c | 888 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
889 | struct flowi4 fl4; |
890 | struct rtable *rt; | |
891 | ||
b57708ad | 892 | rt = ip_route_output_gre(t->net, &fl4, |
cbb1e85f DM |
893 | t->parms.iph.daddr, |
894 | t->parms.iph.saddr, | |
895 | t->parms.o_key, | |
896 | RT_TOS(t->parms.iph.tos), | |
897 | t->parms.link); | |
b23dd4fe | 898 | if (IS_ERR(rt)) |
1da177e4 | 899 | return -EADDRNOTAVAIL; |
d8d1f30b | 900 | dev = rt->dst.dev; |
1da177e4 | 901 | ip_rt_put(rt); |
51456b29 | 902 | if (!__in_dev_get_rtnl(dev)) |
1da177e4 LT |
903 | return -EADDRNOTAVAIL; |
904 | t->mlink = dev->ifindex; | |
e5ed6399 | 905 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
906 | } |
907 | return 0; | |
908 | } | |
909 | ||
910 | static int ipgre_close(struct net_device *dev) | |
911 | { | |
2941a486 | 912 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 913 | |
f97c1e0c | 914 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 915 | struct in_device *in_dev; |
b57708ad | 916 | in_dev = inetdev_by_index(t->net, t->mlink); |
8723e1b4 | 917 | if (in_dev) |
1da177e4 | 918 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
919 | } |
920 | return 0; | |
921 | } | |
1da177e4 LT |
922 | #endif |
923 | ||
b8c26a33 SH |
924 | static const struct net_device_ops ipgre_netdev_ops = { |
925 | .ndo_init = ipgre_tunnel_init, | |
c5441932 | 926 | .ndo_uninit = ip_tunnel_uninit, |
b8c26a33 SH |
927 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
928 | .ndo_open = ipgre_open, | |
929 | .ndo_stop = ipgre_close, | |
930 | #endif | |
c5441932 | 931 | .ndo_start_xmit = ipgre_xmit, |
3e7a1c7c | 932 | .ndo_siocdevprivate = ip_tunnel_siocdevprivate, |
c5441932 | 933 | .ndo_change_mtu = ip_tunnel_change_mtu, |
98d7fc46 | 934 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 935 | .ndo_get_iflink = ip_tunnel_get_iflink, |
607259a6 | 936 | .ndo_tunnel_ctl = ipgre_tunnel_ctl, |
b8c26a33 SH |
937 | }; |
938 | ||
6b78f16e ED |
939 | #define GRE_FEATURES (NETIF_F_SG | \ |
940 | NETIF_F_FRAGLIST | \ | |
941 | NETIF_F_HIGHDMA | \ | |
942 | NETIF_F_HW_CSUM) | |
943 | ||
1da177e4 LT |
944 | static void ipgre_tunnel_setup(struct net_device *dev) |
945 | { | |
b8c26a33 | 946 | dev->netdev_ops = &ipgre_netdev_ops; |
5a455275 | 947 | dev->type = ARPHRD_IPGRE; |
c5441932 PS |
948 | ip_tunnel_setup(dev, ipgre_net_id); |
949 | } | |
1da177e4 | 950 | |
c5441932 PS |
951 | static void __gre_tunnel_init(struct net_device *dev) |
952 | { | |
953 | struct ip_tunnel *tunnel; | |
954 | ||
955 | tunnel = netdev_priv(dev); | |
95f5c64c | 956 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
c5441932 PS |
957 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
958 | ||
4565e991 | 959 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
fdafed45 | 960 | dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph); |
4565e991 | 961 | |
b57708ad | 962 | dev->features |= GRE_FEATURES; |
6b78f16e | 963 | dev->hw_features |= GRE_FEATURES; |
c5441932 PS |
964 | |
965 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { | |
a0ca153f AD |
966 | /* TCP offload with GRE SEQ is not supported, nor |
967 | * can we support 2 levels of outer headers requiring | |
968 | * an update. | |
969 | */ | |
970 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || | |
971 | (tunnel->encap.type == TUNNEL_ENCAP_NONE)) { | |
972 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
973 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
974 | } | |
975 | ||
c5441932 PS |
976 | /* Can use a lockless transmit, unless we generate |
977 | * output sequences | |
978 | */ | |
979 | dev->features |= NETIF_F_LLTX; | |
980 | } | |
1da177e4 LT |
981 | } |
982 | ||
983 | static int ipgre_tunnel_init(struct net_device *dev) | |
984 | { | |
c5441932 PS |
985 | struct ip_tunnel *tunnel = netdev_priv(dev); |
986 | struct iphdr *iph = &tunnel->parms.iph; | |
1da177e4 | 987 | |
c5441932 | 988 | __gre_tunnel_init(dev); |
1da177e4 | 989 | |
c5441932 PS |
990 | memcpy(dev->dev_addr, &iph->saddr, 4); |
991 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1da177e4 | 992 | |
c5441932 | 993 | dev->flags = IFF_NOARP; |
02875878 | 994 | netif_keep_dst(dev); |
c5441932 | 995 | dev->addr_len = 4; |
1da177e4 | 996 | |
a64b04d8 | 997 | if (iph->daddr && !tunnel->collect_md) { |
1da177e4 | 998 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 999 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1000 | if (!iph->saddr) |
1001 | return -EINVAL; | |
1002 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1003 | dev->header_ops = &ipgre_header_ops; |
fdafed45 CW |
1004 | dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
1005 | dev->needed_headroom = 0; | |
1da177e4 LT |
1006 | } |
1007 | #endif | |
a64b04d8 | 1008 | } else if (!tunnel->collect_md) { |
6a5f44d7 | 1009 | dev->header_ops = &ipgre_header_ops; |
fdafed45 CW |
1010 | dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
1011 | dev->needed_headroom = 0; | |
a64b04d8 | 1012 | } |
1da177e4 | 1013 | |
c5441932 | 1014 | return ip_tunnel_init(dev); |
1da177e4 LT |
1015 | } |
1016 | ||
9f57c67c PS |
1017 | static const struct gre_protocol ipgre_protocol = { |
1018 | .handler = gre_rcv, | |
1019 | .err_handler = gre_err, | |
1da177e4 LT |
1020 | }; |
1021 | ||
2c8c1e72 | 1022 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 1023 | { |
c5441932 | 1024 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
59a4c759 PE |
1025 | } |
1026 | ||
64bc1781 | 1027 | static void __net_exit ipgre_exit_batch_net(struct list_head *list_net) |
59a4c759 | 1028 | { |
64bc1781 | 1029 | ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops); |
59a4c759 PE |
1030 | } |
1031 | ||
1032 | static struct pernet_operations ipgre_net_ops = { | |
1033 | .init = ipgre_init_net, | |
64bc1781 | 1034 | .exit_batch = ipgre_exit_batch_net, |
cfb8fbf2 | 1035 | .id = &ipgre_net_id, |
c5441932 | 1036 | .size = sizeof(struct ip_tunnel_net), |
59a4c759 | 1037 | }; |
1da177e4 | 1038 | |
a8b8a889 MS |
1039 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
1040 | struct netlink_ext_ack *extack) | |
c19e654d HX |
1041 | { |
1042 | __be16 flags; | |
1043 | ||
1044 | if (!data) | |
1045 | return 0; | |
1046 | ||
1047 | flags = 0; | |
1048 | if (data[IFLA_GRE_IFLAGS]) | |
1049 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1050 | if (data[IFLA_GRE_OFLAGS]) | |
1051 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1052 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1053 | return -EINVAL; | |
1054 | ||
946b636f JB |
1055 | if (data[IFLA_GRE_COLLECT_METADATA] && |
1056 | data[IFLA_GRE_ENCAP_TYPE] && | |
1057 | nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) | |
1058 | return -EINVAL; | |
1059 | ||
c19e654d HX |
1060 | return 0; |
1061 | } | |
1062 | ||
a8b8a889 MS |
1063 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
1064 | struct netlink_ext_ack *extack) | |
e1a80002 HX |
1065 | { |
1066 | __be32 daddr; | |
1067 | ||
1068 | if (tb[IFLA_ADDRESS]) { | |
1069 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1070 | return -EINVAL; | |
1071 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1072 | return -EADDRNOTAVAIL; | |
1073 | } | |
1074 | ||
1075 | if (!data) | |
1076 | goto out; | |
1077 | ||
1078 | if (data[IFLA_GRE_REMOTE]) { | |
1079 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1080 | if (!daddr) | |
1081 | return -EINVAL; | |
1082 | } | |
1083 | ||
1084 | out: | |
a8b8a889 | 1085 | return ipgre_tunnel_validate(tb, data, extack); |
e1a80002 HX |
1086 | } |
1087 | ||
84e54fe0 WT |
1088 | static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], |
1089 | struct netlink_ext_ack *extack) | |
1090 | { | |
1091 | __be16 flags = 0; | |
1092 | int ret; | |
1093 | ||
1094 | if (!data) | |
1095 | return 0; | |
1096 | ||
1097 | ret = ipgre_tap_validate(tb, data, extack); | |
1098 | if (ret) | |
1099 | return ret; | |
1100 | ||
51fa960d WT |
1101 | if (data[IFLA_GRE_ERSPAN_VER] && |
1102 | nla_get_u8(data[IFLA_GRE_ERSPAN_VER]) == 0) | |
f989d546 WT |
1103 | return 0; |
1104 | ||
1105 | /* ERSPAN type II/III should only have GRE sequence and key flag */ | |
1a66a836 WT |
1106 | if (data[IFLA_GRE_OFLAGS]) |
1107 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1108 | if (data[IFLA_GRE_IFLAGS]) | |
1109 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1110 | if (!data[IFLA_GRE_COLLECT_METADATA] && | |
1111 | flags != (GRE_SEQ | GRE_KEY)) | |
84e54fe0 WT |
1112 | return -EINVAL; |
1113 | ||
1114 | /* ERSPAN Session ID only has 10-bit. Since we reuse | |
1115 | * 32-bit key field as ID, check it's range. | |
1116 | */ | |
1117 | if (data[IFLA_GRE_IKEY] && | |
1118 | (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) | |
1119 | return -EINVAL; | |
1120 | ||
1121 | if (data[IFLA_GRE_OKEY] && | |
1122 | (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) | |
1123 | return -EINVAL; | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
22a59be8 | 1128 | static int ipgre_netlink_parms(struct net_device *dev, |
2e15ea39 PS |
1129 | struct nlattr *data[], |
1130 | struct nlattr *tb[], | |
9830ad4c CG |
1131 | struct ip_tunnel_parm *parms, |
1132 | __u32 *fwmark) | |
c19e654d | 1133 | { |
22a59be8 PP |
1134 | struct ip_tunnel *t = netdev_priv(dev); |
1135 | ||
7bb82d92 | 1136 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1137 | |
1138 | parms->iph.protocol = IPPROTO_GRE; | |
1139 | ||
1140 | if (!data) | |
22a59be8 | 1141 | return 0; |
c19e654d HX |
1142 | |
1143 | if (data[IFLA_GRE_LINK]) | |
1144 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1145 | ||
1146 | if (data[IFLA_GRE_IFLAGS]) | |
c5441932 | 1147 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
c19e654d HX |
1148 | |
1149 | if (data[IFLA_GRE_OFLAGS]) | |
c5441932 | 1150 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
c19e654d HX |
1151 | |
1152 | if (data[IFLA_GRE_IKEY]) | |
1153 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1154 | ||
1155 | if (data[IFLA_GRE_OKEY]) | |
1156 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1157 | ||
1158 | if (data[IFLA_GRE_LOCAL]) | |
67b61f6c | 1159 | parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1160 | |
1161 | if (data[IFLA_GRE_REMOTE]) | |
67b61f6c | 1162 | parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1163 | |
1164 | if (data[IFLA_GRE_TTL]) | |
1165 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1166 | ||
1167 | if (data[IFLA_GRE_TOS]) | |
1168 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1169 | ||
22a59be8 PP |
1170 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) { |
1171 | if (t->ignore_df) | |
1172 | return -EINVAL; | |
c19e654d | 1173 | parms->iph.frag_off = htons(IP_DF); |
22a59be8 | 1174 | } |
2e15ea39 PS |
1175 | |
1176 | if (data[IFLA_GRE_COLLECT_METADATA]) { | |
2e15ea39 | 1177 | t->collect_md = true; |
e271c7b4 JB |
1178 | if (dev->type == ARPHRD_IPGRE) |
1179 | dev->type = ARPHRD_NONE; | |
2e15ea39 | 1180 | } |
22a59be8 PP |
1181 | |
1182 | if (data[IFLA_GRE_IGNORE_DF]) { | |
1183 | if (nla_get_u8(data[IFLA_GRE_IGNORE_DF]) | |
1184 | && (parms->iph.frag_off & htons(IP_DF))) | |
1185 | return -EINVAL; | |
1186 | t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]); | |
1187 | } | |
1188 | ||
9830ad4c CG |
1189 | if (data[IFLA_GRE_FWMARK]) |
1190 | *fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); | |
1191 | ||
e1f8f78f PM |
1192 | return 0; |
1193 | } | |
1194 | ||
1195 | static int erspan_netlink_parms(struct net_device *dev, | |
1196 | struct nlattr *data[], | |
1197 | struct nlattr *tb[], | |
1198 | struct ip_tunnel_parm *parms, | |
1199 | __u32 *fwmark) | |
1200 | { | |
1201 | struct ip_tunnel *t = netdev_priv(dev); | |
1202 | int err; | |
1203 | ||
1204 | err = ipgre_netlink_parms(dev, data, tb, parms, fwmark); | |
1205 | if (err) | |
1206 | return err; | |
32ca98fe PM |
1207 | if (!data) |
1208 | return 0; | |
e1f8f78f | 1209 | |
f551c91d WT |
1210 | if (data[IFLA_GRE_ERSPAN_VER]) { |
1211 | t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); | |
84e54fe0 | 1212 | |
f989d546 | 1213 | if (t->erspan_ver > 2) |
84e54fe0 WT |
1214 | return -EINVAL; |
1215 | } | |
1216 | ||
f551c91d WT |
1217 | if (t->erspan_ver == 1) { |
1218 | if (data[IFLA_GRE_ERSPAN_INDEX]) { | |
1219 | t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); | |
1220 | if (t->index & ~INDEX_MASK) | |
1221 | return -EINVAL; | |
1222 | } | |
1223 | } else if (t->erspan_ver == 2) { | |
1224 | if (data[IFLA_GRE_ERSPAN_DIR]) { | |
1225 | t->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); | |
1226 | if (t->dir & ~(DIR_MASK >> DIR_OFFSET)) | |
1227 | return -EINVAL; | |
1228 | } | |
1229 | if (data[IFLA_GRE_ERSPAN_HWID]) { | |
1230 | t->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); | |
1231 | if (t->hwid & ~(HWID_MASK >> HWID_OFFSET)) | |
1232 | return -EINVAL; | |
1233 | } | |
1234 | } | |
1235 | ||
22a59be8 | 1236 | return 0; |
c19e654d HX |
1237 | } |
1238 | ||
4565e991 TH |
1239 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
1240 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], | |
1241 | struct ip_tunnel_encap *ipencap) | |
1242 | { | |
1243 | bool ret = false; | |
1244 | ||
1245 | memset(ipencap, 0, sizeof(*ipencap)); | |
1246 | ||
1247 | if (!data) | |
1248 | return ret; | |
1249 | ||
1250 | if (data[IFLA_GRE_ENCAP_TYPE]) { | |
1251 | ret = true; | |
1252 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); | |
1253 | } | |
1254 | ||
1255 | if (data[IFLA_GRE_ENCAP_FLAGS]) { | |
1256 | ret = true; | |
1257 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); | |
1258 | } | |
1259 | ||
1260 | if (data[IFLA_GRE_ENCAP_SPORT]) { | |
1261 | ret = true; | |
3e97fa70 | 1262 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
4565e991 TH |
1263 | } |
1264 | ||
1265 | if (data[IFLA_GRE_ENCAP_DPORT]) { | |
1266 | ret = true; | |
3e97fa70 | 1267 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
4565e991 TH |
1268 | } |
1269 | ||
1270 | return ret; | |
1271 | } | |
1272 | ||
c5441932 | 1273 | static int gre_tap_init(struct net_device *dev) |
e1a80002 | 1274 | { |
c5441932 | 1275 | __gre_tunnel_init(dev); |
bec94d43 | 1276 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d51711c0 | 1277 | netif_keep_dst(dev); |
e1a80002 | 1278 | |
c5441932 | 1279 | return ip_tunnel_init(dev); |
e1a80002 HX |
1280 | } |
1281 | ||
c5441932 PS |
1282 | static const struct net_device_ops gre_tap_netdev_ops = { |
1283 | .ndo_init = gre_tap_init, | |
1284 | .ndo_uninit = ip_tunnel_uninit, | |
1285 | .ndo_start_xmit = gre_tap_xmit, | |
b8c26a33 SH |
1286 | .ndo_set_mac_address = eth_mac_addr, |
1287 | .ndo_validate_addr = eth_validate_addr, | |
c5441932 | 1288 | .ndo_change_mtu = ip_tunnel_change_mtu, |
98d7fc46 | 1289 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 1290 | .ndo_get_iflink = ip_tunnel_get_iflink, |
fc4099f1 | 1291 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
b8c26a33 SH |
1292 | }; |
1293 | ||
84e54fe0 WT |
1294 | static int erspan_tunnel_init(struct net_device *dev) |
1295 | { | |
1296 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
84e54fe0 | 1297 | |
f989d546 WT |
1298 | if (tunnel->erspan_ver == 0) |
1299 | tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */ | |
1300 | else | |
1301 | tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */ | |
1302 | ||
84e54fe0 | 1303 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
c122fda2 | 1304 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
f551c91d | 1305 | erspan_hdr_len(tunnel->erspan_ver); |
84e54fe0 | 1306 | |
84e54fe0 WT |
1307 | dev->features |= GRE_FEATURES; |
1308 | dev->hw_features |= GRE_FEATURES; | |
1309 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c84bed44 | 1310 | netif_keep_dst(dev); |
84e54fe0 WT |
1311 | |
1312 | return ip_tunnel_init(dev); | |
1313 | } | |
1314 | ||
1315 | static const struct net_device_ops erspan_netdev_ops = { | |
1316 | .ndo_init = erspan_tunnel_init, | |
1317 | .ndo_uninit = ip_tunnel_uninit, | |
1318 | .ndo_start_xmit = erspan_xmit, | |
1319 | .ndo_set_mac_address = eth_mac_addr, | |
1320 | .ndo_validate_addr = eth_validate_addr, | |
1321 | .ndo_change_mtu = ip_tunnel_change_mtu, | |
98d7fc46 | 1322 | .ndo_get_stats64 = dev_get_tstats64, |
84e54fe0 WT |
1323 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1324 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, | |
1325 | }; | |
1326 | ||
e1a80002 HX |
1327 | static void ipgre_tap_setup(struct net_device *dev) |
1328 | { | |
e1a80002 | 1329 | ether_setup(dev); |
cfddd4c3 | 1330 | dev->max_mtu = 0; |
d13b161c JB |
1331 | dev->netdev_ops = &gre_tap_netdev_ops; |
1332 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
1333 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
c5441932 | 1334 | ip_tunnel_setup(dev, gre_tap_net_id); |
e1a80002 HX |
1335 | } |
1336 | ||
e1f8f78f PM |
1337 | static int |
1338 | ipgre_newlink_encap_setup(struct net_device *dev, struct nlattr *data[]) | |
c19e654d | 1339 | { |
4565e991 TH |
1340 | struct ip_tunnel_encap ipencap; |
1341 | ||
1342 | if (ipgre_netlink_encap_parms(data, &ipencap)) { | |
1343 | struct ip_tunnel *t = netdev_priv(dev); | |
e1f8f78f | 1344 | int err = ip_tunnel_encap_setup(t, &ipencap); |
4565e991 TH |
1345 | |
1346 | if (err < 0) | |
1347 | return err; | |
1348 | } | |
c19e654d | 1349 | |
e1f8f78f PM |
1350 | return 0; |
1351 | } | |
1352 | ||
1353 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, | |
1354 | struct nlattr *tb[], struct nlattr *data[], | |
1355 | struct netlink_ext_ack *extack) | |
1356 | { | |
1357 | struct ip_tunnel_parm p; | |
1358 | __u32 fwmark = 0; | |
1359 | int err; | |
1360 | ||
1361 | err = ipgre_newlink_encap_setup(dev, data); | |
1362 | if (err) | |
1363 | return err; | |
1364 | ||
9830ad4c | 1365 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
22a59be8 PP |
1366 | if (err < 0) |
1367 | return err; | |
9830ad4c | 1368 | return ip_tunnel_newlink(dev, tb, &p, fwmark); |
c19e654d HX |
1369 | } |
1370 | ||
e1f8f78f PM |
1371 | static int erspan_newlink(struct net *src_net, struct net_device *dev, |
1372 | struct nlattr *tb[], struct nlattr *data[], | |
1373 | struct netlink_ext_ack *extack) | |
1374 | { | |
1375 | struct ip_tunnel_parm p; | |
1376 | __u32 fwmark = 0; | |
1377 | int err; | |
1378 | ||
1379 | err = ipgre_newlink_encap_setup(dev, data); | |
1380 | if (err) | |
1381 | return err; | |
1382 | ||
1383 | err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); | |
1384 | if (err) | |
1385 | return err; | |
1386 | return ip_tunnel_newlink(dev, tb, &p, fwmark); | |
1387 | } | |
1388 | ||
c19e654d | 1389 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
ad744b22 MS |
1390 | struct nlattr *data[], |
1391 | struct netlink_ext_ack *extack) | |
c19e654d | 1392 | { |
9830ad4c | 1393 | struct ip_tunnel *t = netdev_priv(dev); |
9830ad4c | 1394 | __u32 fwmark = t->fwmark; |
dd9d598c | 1395 | struct ip_tunnel_parm p; |
22a59be8 | 1396 | int err; |
4565e991 | 1397 | |
e1f8f78f PM |
1398 | err = ipgre_newlink_encap_setup(dev, data); |
1399 | if (err) | |
1400 | return err; | |
c19e654d | 1401 | |
9830ad4c | 1402 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
22a59be8 PP |
1403 | if (err < 0) |
1404 | return err; | |
dd9d598c XL |
1405 | |
1406 | err = ip_tunnel_changelink(dev, tb, &p, fwmark); | |
1407 | if (err < 0) | |
1408 | return err; | |
1409 | ||
1410 | t->parms.i_flags = p.i_flags; | |
1411 | t->parms.o_flags = p.o_flags; | |
1412 | ||
e1f8f78f PM |
1413 | ipgre_link_update(dev, !tb[IFLA_MTU]); |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | static int erspan_changelink(struct net_device *dev, struct nlattr *tb[], | |
1419 | struct nlattr *data[], | |
1420 | struct netlink_ext_ack *extack) | |
1421 | { | |
1422 | struct ip_tunnel *t = netdev_priv(dev); | |
1423 | __u32 fwmark = t->fwmark; | |
1424 | struct ip_tunnel_parm p; | |
1425 | int err; | |
1426 | ||
1427 | err = ipgre_newlink_encap_setup(dev, data); | |
1428 | if (err) | |
1429 | return err; | |
1430 | ||
1431 | err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); | |
1432 | if (err < 0) | |
1433 | return err; | |
1434 | ||
1435 | err = ip_tunnel_changelink(dev, tb, &p, fwmark); | |
1436 | if (err < 0) | |
1437 | return err; | |
1438 | ||
1439 | t->parms.i_flags = p.i_flags; | |
1440 | t->parms.o_flags = p.o_flags; | |
dd9d598c XL |
1441 | |
1442 | return 0; | |
c19e654d HX |
1443 | } |
1444 | ||
1445 | static size_t ipgre_get_size(const struct net_device *dev) | |
1446 | { | |
1447 | return | |
1448 | /* IFLA_GRE_LINK */ | |
1449 | nla_total_size(4) + | |
1450 | /* IFLA_GRE_IFLAGS */ | |
1451 | nla_total_size(2) + | |
1452 | /* IFLA_GRE_OFLAGS */ | |
1453 | nla_total_size(2) + | |
1454 | /* IFLA_GRE_IKEY */ | |
1455 | nla_total_size(4) + | |
1456 | /* IFLA_GRE_OKEY */ | |
1457 | nla_total_size(4) + | |
1458 | /* IFLA_GRE_LOCAL */ | |
1459 | nla_total_size(4) + | |
1460 | /* IFLA_GRE_REMOTE */ | |
1461 | nla_total_size(4) + | |
1462 | /* IFLA_GRE_TTL */ | |
1463 | nla_total_size(1) + | |
1464 | /* IFLA_GRE_TOS */ | |
1465 | nla_total_size(1) + | |
1466 | /* IFLA_GRE_PMTUDISC */ | |
1467 | nla_total_size(1) + | |
4565e991 TH |
1468 | /* IFLA_GRE_ENCAP_TYPE */ |
1469 | nla_total_size(2) + | |
1470 | /* IFLA_GRE_ENCAP_FLAGS */ | |
1471 | nla_total_size(2) + | |
1472 | /* IFLA_GRE_ENCAP_SPORT */ | |
1473 | nla_total_size(2) + | |
1474 | /* IFLA_GRE_ENCAP_DPORT */ | |
1475 | nla_total_size(2) + | |
2e15ea39 PS |
1476 | /* IFLA_GRE_COLLECT_METADATA */ |
1477 | nla_total_size(0) + | |
22a59be8 PP |
1478 | /* IFLA_GRE_IGNORE_DF */ |
1479 | nla_total_size(1) + | |
9830ad4c CG |
1480 | /* IFLA_GRE_FWMARK */ |
1481 | nla_total_size(4) + | |
84e54fe0 WT |
1482 | /* IFLA_GRE_ERSPAN_INDEX */ |
1483 | nla_total_size(4) + | |
f551c91d WT |
1484 | /* IFLA_GRE_ERSPAN_VER */ |
1485 | nla_total_size(1) + | |
1486 | /* IFLA_GRE_ERSPAN_DIR */ | |
1487 | nla_total_size(1) + | |
1488 | /* IFLA_GRE_ERSPAN_HWID */ | |
1489 | nla_total_size(2) + | |
c19e654d HX |
1490 | 0; |
1491 | } | |
1492 | ||
1493 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1494 | { | |
1495 | struct ip_tunnel *t = netdev_priv(dev); | |
1496 | struct ip_tunnel_parm *p = &t->parms; | |
feaf5c79 LB |
1497 | __be16 o_flags = p->o_flags; |
1498 | ||
f989d546 WT |
1499 | if (t->erspan_ver <= 2) { |
1500 | if (t->erspan_ver != 0 && !t->collect_md) | |
2bdf700e LB |
1501 | o_flags |= TUNNEL_KEY; |
1502 | ||
1503 | if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver)) | |
1504 | goto nla_put_failure; | |
1505 | ||
1506 | if (t->erspan_ver == 1) { | |
1507 | if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) | |
1508 | goto nla_put_failure; | |
f989d546 | 1509 | } else if (t->erspan_ver == 2) { |
2bdf700e LB |
1510 | if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir)) |
1511 | goto nla_put_failure; | |
1512 | if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid)) | |
1513 | goto nla_put_failure; | |
1514 | } | |
1515 | } | |
c19e654d | 1516 | |
f3756b79 | 1517 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
95f5c64c TH |
1518 | nla_put_be16(skb, IFLA_GRE_IFLAGS, |
1519 | gre_tnl_flags_to_gre_flags(p->i_flags)) || | |
1520 | nla_put_be16(skb, IFLA_GRE_OFLAGS, | |
feaf5c79 | 1521 | gre_tnl_flags_to_gre_flags(o_flags)) || |
f3756b79 DM |
1522 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
1523 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || | |
930345ea JB |
1524 | nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
1525 | nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || | |
f3756b79 DM |
1526 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
1527 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || | |
1528 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, | |
9830ad4c CG |
1529 | !!(p->iph.frag_off & htons(IP_DF))) || |
1530 | nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark)) | |
f3756b79 | 1531 | goto nla_put_failure; |
4565e991 TH |
1532 | |
1533 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, | |
1534 | t->encap.type) || | |
3e97fa70 SD |
1535 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
1536 | t->encap.sport) || | |
1537 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, | |
1538 | t->encap.dport) || | |
4565e991 | 1539 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
e1b2cb65 | 1540 | t->encap.flags)) |
4565e991 TH |
1541 | goto nla_put_failure; |
1542 | ||
22a59be8 PP |
1543 | if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df)) |
1544 | goto nla_put_failure; | |
1545 | ||
2e15ea39 PS |
1546 | if (t->collect_md) { |
1547 | if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) | |
1548 | goto nla_put_failure; | |
1549 | } | |
1550 | ||
c19e654d HX |
1551 | return 0; |
1552 | ||
1553 | nla_put_failure: | |
1554 | return -EMSGSIZE; | |
1555 | } | |
1556 | ||
84e54fe0 WT |
1557 | static void erspan_setup(struct net_device *dev) |
1558 | { | |
84581bda XL |
1559 | struct ip_tunnel *t = netdev_priv(dev); |
1560 | ||
84e54fe0 | 1561 | ether_setup(dev); |
0e141f75 | 1562 | dev->max_mtu = 0; |
84e54fe0 WT |
1563 | dev->netdev_ops = &erspan_netdev_ops; |
1564 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
1565 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
1566 | ip_tunnel_setup(dev, erspan_net_id); | |
84581bda | 1567 | t->erspan_ver = 1; |
84e54fe0 WT |
1568 | } |
1569 | ||
c19e654d HX |
1570 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
1571 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1572 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1573 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1574 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1575 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
c593642c PB |
1576 | [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, |
1577 | [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, | |
c19e654d HX |
1578 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1579 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1580 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
4565e991 TH |
1581 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
1582 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, | |
1583 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, | |
1584 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, | |
2e15ea39 | 1585 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
22a59be8 | 1586 | [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 }, |
9830ad4c | 1587 | [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
84e54fe0 | 1588 | [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
f551c91d WT |
1589 | [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, |
1590 | [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, | |
1591 | [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, | |
c19e654d HX |
1592 | }; |
1593 | ||
1594 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1595 | .kind = "gre", | |
1596 | .maxtype = IFLA_GRE_MAX, | |
1597 | .policy = ipgre_policy, | |
1598 | .priv_size = sizeof(struct ip_tunnel), | |
1599 | .setup = ipgre_tunnel_setup, | |
1600 | .validate = ipgre_tunnel_validate, | |
1601 | .newlink = ipgre_newlink, | |
1602 | .changelink = ipgre_changelink, | |
c5441932 | 1603 | .dellink = ip_tunnel_dellink, |
c19e654d HX |
1604 | .get_size = ipgre_get_size, |
1605 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1606 | .get_link_net = ip_tunnel_get_link_net, |
c19e654d HX |
1607 | }; |
1608 | ||
e1a80002 HX |
1609 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1610 | .kind = "gretap", | |
1611 | .maxtype = IFLA_GRE_MAX, | |
1612 | .policy = ipgre_policy, | |
1613 | .priv_size = sizeof(struct ip_tunnel), | |
1614 | .setup = ipgre_tap_setup, | |
1615 | .validate = ipgre_tap_validate, | |
1616 | .newlink = ipgre_newlink, | |
1617 | .changelink = ipgre_changelink, | |
c5441932 | 1618 | .dellink = ip_tunnel_dellink, |
e1a80002 HX |
1619 | .get_size = ipgre_get_size, |
1620 | .fill_info = ipgre_fill_info, | |
1728d4fa | 1621 | .get_link_net = ip_tunnel_get_link_net, |
e1a80002 HX |
1622 | }; |
1623 | ||
84e54fe0 WT |
1624 | static struct rtnl_link_ops erspan_link_ops __read_mostly = { |
1625 | .kind = "erspan", | |
1626 | .maxtype = IFLA_GRE_MAX, | |
1627 | .policy = ipgre_policy, | |
1628 | .priv_size = sizeof(struct ip_tunnel), | |
1629 | .setup = erspan_setup, | |
1630 | .validate = erspan_validate, | |
e1f8f78f PM |
1631 | .newlink = erspan_newlink, |
1632 | .changelink = erspan_changelink, | |
84e54fe0 WT |
1633 | .dellink = ip_tunnel_dellink, |
1634 | .get_size = ipgre_get_size, | |
1635 | .fill_info = ipgre_fill_info, | |
1636 | .get_link_net = ip_tunnel_get_link_net, | |
1637 | }; | |
1638 | ||
b2acd1dc PS |
1639 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
1640 | u8 name_assign_type) | |
1641 | { | |
1642 | struct nlattr *tb[IFLA_MAX + 1]; | |
1643 | struct net_device *dev; | |
106da663 | 1644 | LIST_HEAD(list_kill); |
b2acd1dc PS |
1645 | struct ip_tunnel *t; |
1646 | int err; | |
1647 | ||
1648 | memset(&tb, 0, sizeof(tb)); | |
1649 | ||
1650 | dev = rtnl_create_link(net, name, name_assign_type, | |
d0522f1c | 1651 | &ipgre_tap_ops, tb, NULL); |
b2acd1dc PS |
1652 | if (IS_ERR(dev)) |
1653 | return dev; | |
1654 | ||
1655 | /* Configure flow based GRE device. */ | |
1656 | t = netdev_priv(dev); | |
1657 | t->collect_md = true; | |
1658 | ||
7a3f4a18 | 1659 | err = ipgre_newlink(net, dev, tb, NULL, NULL); |
106da663 ND |
1660 | if (err < 0) { |
1661 | free_netdev(dev); | |
1662 | return ERR_PTR(err); | |
1663 | } | |
7e059158 DW |
1664 | |
1665 | /* openvswitch users expect packet sizes to be unrestricted, | |
1666 | * so set the largest MTU we can. | |
1667 | */ | |
1668 | err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); | |
1669 | if (err) | |
1670 | goto out; | |
1671 | ||
da6f1da8 ND |
1672 | err = rtnl_configure_link(dev, NULL); |
1673 | if (err < 0) | |
1674 | goto out; | |
1675 | ||
b2acd1dc PS |
1676 | return dev; |
1677 | out: | |
106da663 ND |
1678 | ip_tunnel_dellink(dev, &list_kill); |
1679 | unregister_netdevice_many(&list_kill); | |
b2acd1dc PS |
1680 | return ERR_PTR(err); |
1681 | } | |
1682 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); | |
1683 | ||
c5441932 PS |
1684 | static int __net_init ipgre_tap_init_net(struct net *net) |
1685 | { | |
2e15ea39 | 1686 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
c5441932 PS |
1687 | } |
1688 | ||
64bc1781 | 1689 | static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net) |
c5441932 | 1690 | { |
64bc1781 | 1691 | ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops); |
c5441932 PS |
1692 | } |
1693 | ||
1694 | static struct pernet_operations ipgre_tap_net_ops = { | |
1695 | .init = ipgre_tap_init_net, | |
64bc1781 | 1696 | .exit_batch = ipgre_tap_exit_batch_net, |
c5441932 PS |
1697 | .id = &gre_tap_net_id, |
1698 | .size = sizeof(struct ip_tunnel_net), | |
1699 | }; | |
1da177e4 | 1700 | |
84e54fe0 WT |
1701 | static int __net_init erspan_init_net(struct net *net) |
1702 | { | |
1703 | return ip_tunnel_init_net(net, erspan_net_id, | |
1704 | &erspan_link_ops, "erspan0"); | |
1705 | } | |
1706 | ||
64bc1781 | 1707 | static void __net_exit erspan_exit_batch_net(struct list_head *net_list) |
84e54fe0 | 1708 | { |
64bc1781 | 1709 | ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops); |
84e54fe0 WT |
1710 | } |
1711 | ||
1712 | static struct pernet_operations erspan_net_ops = { | |
1713 | .init = erspan_init_net, | |
64bc1781 | 1714 | .exit_batch = erspan_exit_batch_net, |
84e54fe0 WT |
1715 | .id = &erspan_net_id, |
1716 | .size = sizeof(struct ip_tunnel_net), | |
1717 | }; | |
1718 | ||
1da177e4 LT |
1719 | static int __init ipgre_init(void) |
1720 | { | |
1721 | int err; | |
1722 | ||
058bd4d2 | 1723 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1724 | |
cfb8fbf2 | 1725 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1726 | if (err < 0) |
c2892f02 AD |
1727 | return err; |
1728 | ||
c5441932 PS |
1729 | err = register_pernet_device(&ipgre_tap_net_ops); |
1730 | if (err < 0) | |
e3d0328c | 1731 | goto pnet_tap_failed; |
c5441932 | 1732 | |
84e54fe0 WT |
1733 | err = register_pernet_device(&erspan_net_ops); |
1734 | if (err < 0) | |
1735 | goto pnet_erspan_failed; | |
1736 | ||
9f57c67c | 1737 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1738 | if (err < 0) { |
058bd4d2 | 1739 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1740 | goto add_proto_failed; |
1741 | } | |
7daa0004 | 1742 | |
c19e654d HX |
1743 | err = rtnl_link_register(&ipgre_link_ops); |
1744 | if (err < 0) | |
1745 | goto rtnl_link_failed; | |
1746 | ||
e1a80002 HX |
1747 | err = rtnl_link_register(&ipgre_tap_ops); |
1748 | if (err < 0) | |
1749 | goto tap_ops_failed; | |
1750 | ||
84e54fe0 WT |
1751 | err = rtnl_link_register(&erspan_link_ops); |
1752 | if (err < 0) | |
1753 | goto erspan_link_failed; | |
1754 | ||
c5441932 | 1755 | return 0; |
c19e654d | 1756 | |
84e54fe0 WT |
1757 | erspan_link_failed: |
1758 | rtnl_link_unregister(&ipgre_tap_ops); | |
e1a80002 HX |
1759 | tap_ops_failed: |
1760 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1761 | rtnl_link_failed: |
9f57c67c | 1762 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1763 | add_proto_failed: |
84e54fe0 WT |
1764 | unregister_pernet_device(&erspan_net_ops); |
1765 | pnet_erspan_failed: | |
c5441932 | 1766 | unregister_pernet_device(&ipgre_tap_net_ops); |
e3d0328c | 1767 | pnet_tap_failed: |
c2892f02 | 1768 | unregister_pernet_device(&ipgre_net_ops); |
c5441932 | 1769 | return err; |
1da177e4 LT |
1770 | } |
1771 | ||
db44575f | 1772 | static void __exit ipgre_fini(void) |
1da177e4 | 1773 | { |
e1a80002 | 1774 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1775 | rtnl_link_unregister(&ipgre_link_ops); |
84e54fe0 | 1776 | rtnl_link_unregister(&erspan_link_ops); |
9f57c67c | 1777 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c5441932 | 1778 | unregister_pernet_device(&ipgre_tap_net_ops); |
c2892f02 | 1779 | unregister_pernet_device(&ipgre_net_ops); |
84e54fe0 | 1780 | unregister_pernet_device(&erspan_net_ops); |
1da177e4 LT |
1781 | } |
1782 | ||
1783 | module_init(ipgre_init); | |
1784 | module_exit(ipgre_fini); | |
1785 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1786 | MODULE_ALIAS_RTNL_LINK("gre"); |
1787 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
84e54fe0 | 1788 | MODULE_ALIAS_RTNL_LINK("erspan"); |
8909c9ad | 1789 | MODULE_ALIAS_NETDEV("gre0"); |
c5441932 | 1790 | MODULE_ALIAS_NETDEV("gretap0"); |
84e54fe0 | 1791 | MODULE_ALIAS_NETDEV("erspan0"); |