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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1181412c S |
2 | /* |
3 | * Linux NET3: IP/IP protocol decoder modified to support | |
4 | * virtual tunnel interface | |
5 | * | |
6 | * Authors: | |
7 | * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012 | |
1181412c S |
8 | */ |
9 | ||
10 | /* | |
11 | This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c | |
12 | ||
13 | For comments look at net/ipv4/ip_gre.c --ANK | |
14 | */ | |
15 | ||
16 | ||
17 | #include <linux/capability.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/tcp.h> | |
26 | #include <linux/udp.h> | |
27 | #include <linux/if_arp.h> | |
1181412c S |
28 | #include <linux/init.h> |
29 | #include <linux/netfilter_ipv4.h> | |
30 | #include <linux/if_ether.h> | |
78a010cc | 31 | #include <linux/icmpv6.h> |
1181412c S |
32 | |
33 | #include <net/sock.h> | |
34 | #include <net/ip.h> | |
35 | #include <net/icmp.h> | |
c5441932 | 36 | #include <net/ip_tunnels.h> |
1181412c S |
37 | #include <net/inet_ecn.h> |
38 | #include <net/xfrm.h> | |
39 | #include <net/net_namespace.h> | |
40 | #include <net/netns/generic.h> | |
41 | ||
1181412c S |
42 | static struct rtnl_link_ops vti_link_ops __read_mostly; |
43 | ||
c7d03a00 | 44 | static unsigned int vti_net_id __read_mostly; |
1181412c | 45 | static int vti_tunnel_init(struct net_device *dev); |
1181412c | 46 | |
df3893c1 | 47 | static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi, |
f981c57f | 48 | int encap_type, bool update_skb_dev) |
1181412c S |
49 | { |
50 | struct ip_tunnel *tunnel; | |
51 | const struct iphdr *iph = ip_hdr(skb); | |
b9959fd3 AW |
52 | struct net *net = dev_net(skb->dev); |
53 | struct ip_tunnel_net *itn = net_generic(net, vti_net_id); | |
1181412c | 54 | |
b9959fd3 AW |
55 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, |
56 | iph->saddr, iph->daddr, 0); | |
00db4124 | 57 | if (tunnel) { |
df3893c1 SK |
58 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
59 | goto drop; | |
60 | ||
61 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel; | |
df3893c1 | 62 | |
f981c57f JS |
63 | if (update_skb_dev) |
64 | skb->dev = tunnel->dev; | |
65 | ||
df3893c1 SK |
66 | return xfrm_input(skb, nexthdr, spi, encap_type); |
67 | } | |
68 | ||
69 | return -EINVAL; | |
70 | drop: | |
71 | kfree_skb(skb); | |
72 | return 0; | |
73 | } | |
74 | ||
f981c57f JS |
75 | static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi, |
76 | int encap_type) | |
dd9ee344 | 77 | { |
f981c57f | 78 | return vti_input(skb, nexthdr, spi, encap_type, false); |
dd9ee344 SY |
79 | } |
80 | ||
f981c57f | 81 | static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev) |
df3893c1 SK |
82 | { |
83 | XFRM_SPI_SKB_CB(skb)->family = AF_INET; | |
84 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); | |
85 | ||
f981c57f | 86 | return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev); |
df3893c1 SK |
87 | } |
88 | ||
f981c57f | 89 | static int vti_rcv_proto(struct sk_buff *skb) |
dd9ee344 | 90 | { |
f981c57f JS |
91 | return vti_rcv(skb, 0, false); |
92 | } | |
dd9ee344 | 93 | |
df3893c1 SK |
94 | static int vti_rcv_cb(struct sk_buff *skb, int err) |
95 | { | |
96 | unsigned short family; | |
97 | struct net_device *dev; | |
df3893c1 | 98 | struct xfrm_state *x; |
4c145dce | 99 | const struct xfrm_mode *inner_mode; |
df3893c1 | 100 | struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4; |
d55c670c AD |
101 | u32 orig_mark = skb->mark; |
102 | int ret; | |
df3893c1 SK |
103 | |
104 | if (!tunnel) | |
1181412c | 105 | return 1; |
df3893c1 SK |
106 | |
107 | dev = tunnel->dev; | |
108 | ||
109 | if (err) { | |
110 | dev->stats.rx_errors++; | |
111 | dev->stats.rx_dropped++; | |
112 | ||
113 | return 0; | |
1181412c | 114 | } |
1181412c | 115 | |
df3893c1 | 116 | x = xfrm_input_state(skb); |
1fb81e09 | 117 | |
c9500d7b | 118 | inner_mode = &x->inner_mode; |
1fb81e09 | 119 | |
120 | if (x->sel.family == AF_UNSPEC) { | |
121 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
122 | if (inner_mode == NULL) { | |
123 | XFRM_INC_STATS(dev_net(skb->dev), | |
124 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
125 | return -EINVAL; | |
126 | } | |
127 | } | |
128 | ||
b45714b1 | 129 | family = inner_mode->family; |
df3893c1 | 130 | |
d55c670c AD |
131 | skb->mark = be32_to_cpu(tunnel->parms.i_key); |
132 | ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); | |
133 | skb->mark = orig_mark; | |
134 | ||
135 | if (!ret) | |
df3893c1 SK |
136 | return -EPERM; |
137 | ||
138 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev))); | |
139 | skb->dev = dev; | |
560b50cf | 140 | dev_sw_netstats_rx_add(dev, skb->len); |
df3893c1 SK |
141 | |
142 | return 0; | |
1181412c S |
143 | } |
144 | ||
6e2de802 SK |
145 | static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src) |
146 | { | |
147 | xfrm_address_t *daddr = (xfrm_address_t *)&dst; | |
148 | xfrm_address_t *saddr = (xfrm_address_t *)&src; | |
149 | ||
150 | /* if there is no transform then this tunnel is not functional. | |
151 | * Or if the xfrm is not mode tunnel. | |
152 | */ | |
153 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || | |
154 | x->props.family != AF_INET) | |
155 | return false; | |
156 | ||
157 | if (!dst) | |
158 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET); | |
159 | ||
160 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET)) | |
161 | return false; | |
162 | ||
163 | return true; | |
164 | } | |
165 | ||
78a010cc SK |
166 | static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, |
167 | struct flowi *fl) | |
1181412c S |
168 | { |
169 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
6e2de802 | 170 | struct ip_tunnel_parm *parms = &tunnel->parms; |
a34cd4f3 | 171 | struct dst_entry *dst = skb_dst(skb); |
1181412c | 172 | struct net_device *tdev; /* Device to other host */ |
36f6ee22 | 173 | int pkt_len = skb->len; |
b9959fd3 | 174 | int err; |
d6af1a31 | 175 | int mtu; |
1181412c | 176 | |
a34cd4f3 | 177 | if (!dst) { |
f1ed1026 ND |
178 | switch (skb->protocol) { |
179 | case htons(ETH_P_IP): { | |
180 | struct rtable *rt; | |
181 | ||
182 | fl->u.ip4.flowi4_oif = dev->ifindex; | |
183 | fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; | |
184 | rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4); | |
185 | if (IS_ERR(rt)) { | |
186 | dev->stats.tx_carrier_errors++; | |
187 | goto tx_error_icmp; | |
188 | } | |
189 | dst = &rt->dst; | |
190 | skb_dst_set(skb, dst); | |
191 | break; | |
192 | } | |
193 | #if IS_ENABLED(CONFIG_IPV6) | |
194 | case htons(ETH_P_IPV6): | |
195 | fl->u.ip6.flowi6_oif = dev->ifindex; | |
196 | fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; | |
197 | dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6); | |
198 | if (dst->error) { | |
199 | dst_release(dst); | |
200 | dst = NULL; | |
201 | dev->stats.tx_carrier_errors++; | |
202 | goto tx_error_icmp; | |
203 | } | |
204 | skb_dst_set(skb, dst); | |
205 | break; | |
206 | #endif | |
207 | default: | |
95224166 ND |
208 | dev->stats.tx_carrier_errors++; |
209 | goto tx_error_icmp; | |
210 | } | |
df3893c1 | 211 | } |
1181412c | 212 | |
a34cd4f3 | 213 | dst_hold(dst); |
b328ecc4 | 214 | dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0); |
a34cd4f3 | 215 | if (IS_ERR(dst)) { |
1181412c S |
216 | dev->stats.tx_carrier_errors++; |
217 | goto tx_error_icmp; | |
218 | } | |
df3893c1 | 219 | |
b328ecc4 | 220 | if (dst->flags & DST_XFRM_QUEUE) |
c7c1abfd | 221 | goto xmit; |
b328ecc4 | 222 | |
6e2de802 | 223 | if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) { |
1181412c | 224 | dev->stats.tx_carrier_errors++; |
a34cd4f3 | 225 | dst_release(dst); |
1181412c S |
226 | goto tx_error_icmp; |
227 | } | |
6e2de802 | 228 | |
a34cd4f3 | 229 | tdev = dst->dev; |
1181412c S |
230 | |
231 | if (tdev == dev) { | |
a34cd4f3 | 232 | dst_release(dst); |
1181412c S |
233 | dev->stats.collisions++; |
234 | goto tx_error; | |
235 | } | |
236 | ||
d6af1a31 SK |
237 | mtu = dst_mtu(dst); |
238 | if (skb->len > mtu) { | |
8247a79e | 239 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
d6af1a31 | 240 | if (skb->protocol == htons(ETH_P_IP)) { |
c7c1abfd EB |
241 | if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) |
242 | goto xmit; | |
4372339e JD |
243 | icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
244 | htonl(mtu)); | |
d6af1a31 SK |
245 | } else { |
246 | if (mtu < IPV6_MIN_MTU) | |
247 | mtu = IPV6_MIN_MTU; | |
248 | ||
4372339e | 249 | icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
d6af1a31 SK |
250 | } |
251 | ||
252 | dst_release(dst); | |
253 | goto tx_error; | |
254 | } | |
255 | ||
c7c1abfd | 256 | xmit: |
df3893c1 | 257 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); |
a34cd4f3 | 258 | skb_dst_set(skb, dst); |
1181412c S |
259 | skb->dev = skb_dst(skb)->dev; |
260 | ||
13206b6b | 261 | err = dst_output(tunnel->net, skb->sk, skb); |
b9959fd3 | 262 | if (net_xmit_eval(err) == 0) |
36f6ee22 | 263 | err = pkt_len; |
039f5062 | 264 | iptunnel_xmit_stats(dev, err); |
1181412c S |
265 | return NETDEV_TX_OK; |
266 | ||
267 | tx_error_icmp: | |
268 | dst_link_failure(skb); | |
269 | tx_error: | |
270 | dev->stats.tx_errors++; | |
3acfa1e7 | 271 | kfree_skb(skb); |
1181412c S |
272 | return NETDEV_TX_OK; |
273 | } | |
274 | ||
78a010cc SK |
275 | /* This function assumes it is being called from dev_queue_xmit() |
276 | * and that skb is filled properly by that function. | |
277 | */ | |
278 | static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
279 | { | |
280 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
281 | struct flowi fl; | |
282 | ||
cb9f1b78 WB |
283 | if (!pskb_inet_may_pull(skb)) |
284 | goto tx_err; | |
285 | ||
78a010cc SK |
286 | memset(&fl, 0, sizeof(fl)); |
287 | ||
78a010cc SK |
288 | switch (skb->protocol) { |
289 | case htons(ETH_P_IP): | |
290 | xfrm_decode_session(skb, &fl, AF_INET); | |
291 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
292 | break; | |
293 | case htons(ETH_P_IPV6): | |
294 | xfrm_decode_session(skb, &fl, AF_INET6); | |
295 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
296 | break; | |
297 | default: | |
cb9f1b78 | 298 | goto tx_err; |
78a010cc SK |
299 | } |
300 | ||
cd5279c1 AD |
301 | /* override mark with tunnel output key */ |
302 | fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key); | |
303 | ||
78a010cc | 304 | return vti_xmit(skb, dev, &fl); |
cb9f1b78 WB |
305 | |
306 | tx_err: | |
307 | dev->stats.tx_errors++; | |
308 | kfree_skb(skb); | |
309 | return NETDEV_TX_OK; | |
78a010cc SK |
310 | } |
311 | ||
df3893c1 SK |
312 | static int vti4_err(struct sk_buff *skb, u32 info) |
313 | { | |
314 | __be32 spi; | |
6d004d6c | 315 | __u32 mark; |
df3893c1 SK |
316 | struct xfrm_state *x; |
317 | struct ip_tunnel *tunnel; | |
318 | struct ip_esp_hdr *esph; | |
319 | struct ip_auth_hdr *ah ; | |
320 | struct ip_comp_hdr *ipch; | |
321 | struct net *net = dev_net(skb->dev); | |
322 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
323 | int protocol = iph->protocol; | |
324 | struct ip_tunnel_net *itn = net_generic(net, vti_net_id); | |
325 | ||
326 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, | |
327 | iph->daddr, iph->saddr, 0); | |
328 | if (!tunnel) | |
329 | return -1; | |
330 | ||
6d004d6c SK |
331 | mark = be32_to_cpu(tunnel->parms.o_key); |
332 | ||
df3893c1 SK |
333 | switch (protocol) { |
334 | case IPPROTO_ESP: | |
335 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); | |
336 | spi = esph->spi; | |
337 | break; | |
338 | case IPPROTO_AH: | |
339 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); | |
340 | spi = ah->spi; | |
341 | break; | |
342 | case IPPROTO_COMP: | |
343 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); | |
344 | spi = htonl(ntohs(ipch->cpi)); | |
345 | break; | |
346 | default: | |
347 | return 0; | |
348 | } | |
349 | ||
350 | switch (icmp_hdr(skb)->type) { | |
351 | case ICMP_DEST_UNREACH: | |
352 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
353 | return 0; | |
79121184 | 354 | break; |
df3893c1 SK |
355 | case ICMP_REDIRECT: |
356 | break; | |
357 | default: | |
358 | return 0; | |
359 | } | |
360 | ||
6d004d6c | 361 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
df3893c1 SK |
362 | spi, protocol, AF_INET); |
363 | if (!x) | |
364 | return 0; | |
365 | ||
366 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) | |
d888f396 | 367 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
df3893c1 | 368 | else |
1042caa7 | 369 | ipv4_redirect(skb, net, 0, protocol); |
df3893c1 SK |
370 | xfrm_state_put(x); |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
1181412c | 375 | static int |
607259a6 | 376 | vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) |
1181412c S |
377 | { |
378 | int err = 0; | |
1181412c | 379 | |
b9959fd3 | 380 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
607259a6 CH |
381 | if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP || |
382 | p->iph.ihl != 5) | |
b9959fd3 AW |
383 | return -EINVAL; |
384 | } | |
1181412c | 385 | |
607259a6 CH |
386 | if (!(p->i_flags & GRE_KEY)) |
387 | p->i_key = 0; | |
388 | if (!(p->o_flags & GRE_KEY)) | |
389 | p->o_key = 0; | |
7c8e6b9c | 390 | |
607259a6 | 391 | p->i_flags = VTI_ISVTI; |
7c8e6b9c | 392 | |
607259a6 | 393 | err = ip_tunnel_ctl(dev, p, cmd); |
b9959fd3 AW |
394 | if (err) |
395 | return err; | |
1181412c | 396 | |
b9959fd3 | 397 | if (cmd != SIOCDELTUNNEL) { |
607259a6 CH |
398 | p->i_flags |= GRE_KEY; |
399 | p->o_flags |= GRE_KEY; | |
1181412c | 400 | } |
1181412c S |
401 | return 0; |
402 | } | |
403 | ||
404 | static const struct net_device_ops vti_netdev_ops = { | |
405 | .ndo_init = vti_tunnel_init, | |
b9959fd3 | 406 | .ndo_uninit = ip_tunnel_uninit, |
1181412c | 407 | .ndo_start_xmit = vti_tunnel_xmit, |
3e7a1c7c | 408 | .ndo_siocdevprivate = ip_tunnel_siocdevprivate, |
b9959fd3 | 409 | .ndo_change_mtu = ip_tunnel_change_mtu, |
8f3feb24 | 410 | .ndo_get_stats64 = dev_get_tstats64, |
1e99584b | 411 | .ndo_get_iflink = ip_tunnel_get_iflink, |
607259a6 | 412 | .ndo_tunnel_ctl = vti_tunnel_ctl, |
1181412c S |
413 | }; |
414 | ||
b9959fd3 | 415 | static void vti_tunnel_setup(struct net_device *dev) |
1181412c | 416 | { |
b9959fd3 | 417 | dev->netdev_ops = &vti_netdev_ops; |
ab59d2b6 | 418 | dev->header_ops = &ip_tunnel_header_ops; |
8d89dcdf | 419 | dev->type = ARPHRD_TUNNEL; |
b9959fd3 | 420 | ip_tunnel_setup(dev, vti_net_id); |
1181412c S |
421 | } |
422 | ||
b9959fd3 | 423 | static int vti_tunnel_init(struct net_device *dev) |
1181412c | 424 | { |
b9959fd3 AW |
425 | struct ip_tunnel *tunnel = netdev_priv(dev); |
426 | struct iphdr *iph = &tunnel->parms.iph; | |
427 | ||
428 | memcpy(dev->dev_addr, &iph->saddr, 4); | |
429 | memcpy(dev->broadcast, &iph->daddr, 4); | |
1181412c | 430 | |
1181412c | 431 | dev->flags = IFF_NOARP; |
1181412c | 432 | dev->addr_len = 4; |
1181412c | 433 | dev->features |= NETIF_F_LLTX; |
02875878 | 434 | netif_keep_dst(dev); |
1181412c | 435 | |
b9959fd3 | 436 | return ip_tunnel_init(dev); |
1181412c S |
437 | } |
438 | ||
b9959fd3 | 439 | static void __net_init vti_fb_tunnel_init(struct net_device *dev) |
1181412c S |
440 | { |
441 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
442 | struct iphdr *iph = &tunnel->parms.iph; | |
1181412c | 443 | |
1181412c S |
444 | iph->version = 4; |
445 | iph->protocol = IPPROTO_IPIP; | |
446 | iph->ihl = 5; | |
1181412c S |
447 | } |
448 | ||
df3893c1 | 449 | static struct xfrm4_protocol vti_esp4_protocol __read_mostly = { |
f981c57f JS |
450 | .handler = vti_rcv_proto, |
451 | .input_handler = vti_input_proto, | |
df3893c1 SK |
452 | .cb_handler = vti_rcv_cb, |
453 | .err_handler = vti4_err, | |
454 | .priority = 100, | |
455 | }; | |
456 | ||
457 | static struct xfrm4_protocol vti_ah4_protocol __read_mostly = { | |
f981c57f JS |
458 | .handler = vti_rcv_proto, |
459 | .input_handler = vti_input_proto, | |
df3893c1 SK |
460 | .cb_handler = vti_rcv_cb, |
461 | .err_handler = vti4_err, | |
462 | .priority = 100, | |
463 | }; | |
464 | ||
465 | static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = { | |
f981c57f JS |
466 | .handler = vti_rcv_proto, |
467 | .input_handler = vti_input_proto, | |
df3893c1 SK |
468 | .cb_handler = vti_rcv_cb, |
469 | .err_handler = vti4_err, | |
470 | .priority = 100, | |
1181412c S |
471 | }; |
472 | ||
87e66b96 XL |
473 | #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) |
474 | static int vti_rcv_tunnel(struct sk_buff *skb) | |
475 | { | |
476 | XFRM_SPI_SKB_CB(skb)->family = AF_INET; | |
477 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); | |
478 | ||
479 | return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false); | |
480 | } | |
481 | ||
482 | static struct xfrm_tunnel vti_ipip_handler __read_mostly = { | |
f981c57f | 483 | .handler = vti_rcv_tunnel, |
87e66b96 | 484 | .cb_handler = vti_rcv_cb, |
dd9ee344 SY |
485 | .err_handler = vti4_err, |
486 | .priority = 0, | |
487 | }; | |
55a48c7e | 488 | |
61ee4137 | 489 | #if IS_ENABLED(CONFIG_IPV6) |
55a48c7e | 490 | static struct xfrm_tunnel vti_ipip6_handler __read_mostly = { |
f981c57f | 491 | .handler = vti_rcv_tunnel, |
55a48c7e | 492 | .cb_handler = vti_rcv_cb, |
dd9ee344 SY |
493 | .err_handler = vti4_err, |
494 | .priority = 0, | |
495 | }; | |
87e66b96 | 496 | #endif |
61ee4137 | 497 | #endif |
dd9ee344 | 498 | |
1181412c S |
499 | static int __net_init vti_init_net(struct net *net) |
500 | { | |
501 | int err; | |
b9959fd3 | 502 | struct ip_tunnel_net *itn; |
1181412c | 503 | |
b9959fd3 | 504 | err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0"); |
1181412c | 505 | if (err) |
b9959fd3 AW |
506 | return err; |
507 | itn = net_generic(net, vti_net_id); | |
cd1aa9c2 HY |
508 | if (itn->fb_tunnel_dev) |
509 | vti_fb_tunnel_init(itn->fb_tunnel_dev); | |
1181412c | 510 | return 0; |
1181412c S |
511 | } |
512 | ||
64bc1781 | 513 | static void __net_exit vti_exit_batch_net(struct list_head *list_net) |
1181412c | 514 | { |
64bc1781 | 515 | ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops); |
1181412c S |
516 | } |
517 | ||
518 | static struct pernet_operations vti_net_ops = { | |
519 | .init = vti_init_net, | |
64bc1781 | 520 | .exit_batch = vti_exit_batch_net, |
1181412c | 521 | .id = &vti_net_id, |
b9959fd3 | 522 | .size = sizeof(struct ip_tunnel_net), |
1181412c S |
523 | }; |
524 | ||
a8b8a889 MS |
525 | static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
526 | struct netlink_ext_ack *extack) | |
1181412c S |
527 | { |
528 | return 0; | |
529 | } | |
530 | ||
531 | static void vti_netlink_parms(struct nlattr *data[], | |
9830ad4c CG |
532 | struct ip_tunnel_parm *parms, |
533 | __u32 *fwmark) | |
1181412c S |
534 | { |
535 | memset(parms, 0, sizeof(*parms)); | |
536 | ||
537 | parms->iph.protocol = IPPROTO_IPIP; | |
538 | ||
539 | if (!data) | |
540 | return; | |
541 | ||
df3893c1 SK |
542 | parms->i_flags = VTI_ISVTI; |
543 | ||
1181412c S |
544 | if (data[IFLA_VTI_LINK]) |
545 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); | |
546 | ||
547 | if (data[IFLA_VTI_IKEY]) | |
548 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); | |
549 | ||
550 | if (data[IFLA_VTI_OKEY]) | |
551 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); | |
552 | ||
553 | if (data[IFLA_VTI_LOCAL]) | |
67b61f6c | 554 | parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]); |
1181412c S |
555 | |
556 | if (data[IFLA_VTI_REMOTE]) | |
67b61f6c | 557 | parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]); |
1181412c | 558 | |
9830ad4c CG |
559 | if (data[IFLA_VTI_FWMARK]) |
560 | *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); | |
1181412c S |
561 | } |
562 | ||
563 | static int vti_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
564 | struct nlattr *tb[], struct nlattr *data[], |
565 | struct netlink_ext_ack *extack) | |
1181412c | 566 | { |
b9959fd3 | 567 | struct ip_tunnel_parm parms; |
9830ad4c | 568 | __u32 fwmark = 0; |
1181412c | 569 | |
9830ad4c CG |
570 | vti_netlink_parms(data, &parms, &fwmark); |
571 | return ip_tunnel_newlink(dev, tb, &parms, fwmark); | |
1181412c S |
572 | } |
573 | ||
574 | static int vti_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
575 | struct nlattr *data[], |
576 | struct netlink_ext_ack *extack) | |
1181412c | 577 | { |
9830ad4c CG |
578 | struct ip_tunnel *t = netdev_priv(dev); |
579 | __u32 fwmark = t->fwmark; | |
1181412c | 580 | struct ip_tunnel_parm p; |
1181412c | 581 | |
9830ad4c CG |
582 | vti_netlink_parms(data, &p, &fwmark); |
583 | return ip_tunnel_changelink(dev, tb, &p, fwmark); | |
1181412c S |
584 | } |
585 | ||
586 | static size_t vti_get_size(const struct net_device *dev) | |
587 | { | |
588 | return | |
589 | /* IFLA_VTI_LINK */ | |
590 | nla_total_size(4) + | |
591 | /* IFLA_VTI_IKEY */ | |
592 | nla_total_size(4) + | |
593 | /* IFLA_VTI_OKEY */ | |
594 | nla_total_size(4) + | |
595 | /* IFLA_VTI_LOCAL */ | |
596 | nla_total_size(4) + | |
597 | /* IFLA_VTI_REMOTE */ | |
598 | nla_total_size(4) + | |
9830ad4c CG |
599 | /* IFLA_VTI_FWMARK */ |
600 | nla_total_size(4) + | |
1181412c S |
601 | 0; |
602 | } | |
603 | ||
604 | static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
605 | { | |
606 | struct ip_tunnel *t = netdev_priv(dev); | |
607 | struct ip_tunnel_parm *p = &t->parms; | |
608 | ||
8ed508fd HL |
609 | if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) || |
610 | nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) || | |
611 | nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) || | |
612 | nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) || | |
613 | nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) || | |
614 | nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark)) | |
615 | return -EMSGSIZE; | |
1181412c S |
616 | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = { | |
621 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, | |
622 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, | |
623 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, | |
c593642c PB |
624 | [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, |
625 | [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, | |
9830ad4c | 626 | [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, |
1181412c S |
627 | }; |
628 | ||
629 | static struct rtnl_link_ops vti_link_ops __read_mostly = { | |
630 | .kind = "vti", | |
631 | .maxtype = IFLA_VTI_MAX, | |
632 | .policy = vti_policy, | |
633 | .priv_size = sizeof(struct ip_tunnel), | |
634 | .setup = vti_tunnel_setup, | |
635 | .validate = vti_tunnel_validate, | |
636 | .newlink = vti_newlink, | |
637 | .changelink = vti_changelink, | |
20ea60ca | 638 | .dellink = ip_tunnel_dellink, |
1181412c S |
639 | .get_size = vti_get_size, |
640 | .fill_info = vti_fill_info, | |
1728d4fa | 641 | .get_link_net = ip_tunnel_get_link_net, |
1181412c S |
642 | }; |
643 | ||
644 | static int __init vti_init(void) | |
645 | { | |
1990e4f8 | 646 | const char *msg; |
1181412c S |
647 | int err; |
648 | ||
1990e4f8 | 649 | pr_info("IPv4 over IPsec tunneling driver\n"); |
1181412c | 650 | |
1990e4f8 | 651 | msg = "tunnel device"; |
1181412c S |
652 | err = register_pernet_device(&vti_net_ops); |
653 | if (err < 0) | |
1990e4f8 | 654 | goto pernet_dev_failed; |
df3893c1 | 655 | |
1990e4f8 MK |
656 | msg = "tunnel protocols"; |
657 | err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP); | |
658 | if (err < 0) | |
659 | goto xfrm_proto_esp_failed; | |
df3893c1 | 660 | err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH); |
1990e4f8 MK |
661 | if (err < 0) |
662 | goto xfrm_proto_ah_failed; | |
df3893c1 | 663 | err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP); |
1990e4f8 MK |
664 | if (err < 0) |
665 | goto xfrm_proto_comp_failed; | |
1181412c | 666 | |
87e66b96 | 667 | #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) |
dd9ee344 | 668 | msg = "ipip tunnel"; |
87e66b96 | 669 | err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET); |
01ce31c5 | 670 | if (err < 0) |
e6ce6457 XL |
671 | goto xfrm_tunnel_ipip_failed; |
672 | #if IS_ENABLED(CONFIG_IPV6) | |
55a48c7e | 673 | err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6); |
01ce31c5 | 674 | if (err < 0) |
e6ce6457 XL |
675 | goto xfrm_tunnel_ipip6_failed; |
676 | #endif | |
87e66b96 | 677 | #endif |
dd9ee344 | 678 | |
1990e4f8 | 679 | msg = "netlink interface"; |
1181412c S |
680 | err = rtnl_link_register(&vti_link_ops); |
681 | if (err < 0) | |
682 | goto rtnl_link_failed; | |
683 | ||
684 | return err; | |
685 | ||
686 | rtnl_link_failed: | |
87e66b96 | 687 | #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) |
e6ce6457 | 688 | #if IS_ENABLED(CONFIG_IPV6) |
55a48c7e | 689 | xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); |
e6ce6457 XL |
690 | xfrm_tunnel_ipip6_failed: |
691 | #endif | |
87e66b96 | 692 | xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); |
e6ce6457 | 693 | xfrm_tunnel_ipip_failed: |
87e66b96 | 694 | #endif |
5483844c | 695 | xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); |
1990e4f8 | 696 | xfrm_proto_comp_failed: |
df3893c1 | 697 | xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); |
1990e4f8 | 698 | xfrm_proto_ah_failed: |
df3893c1 | 699 | xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); |
1990e4f8 | 700 | xfrm_proto_esp_failed: |
1181412c | 701 | unregister_pernet_device(&vti_net_ops); |
1990e4f8 MK |
702 | pernet_dev_failed: |
703 | pr_err("vti init: failed to register %s\n", msg); | |
1181412c S |
704 | return err; |
705 | } | |
706 | ||
707 | static void __exit vti_fini(void) | |
708 | { | |
709 | rtnl_link_unregister(&vti_link_ops); | |
87e66b96 | 710 | #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) |
e6ce6457 | 711 | #if IS_ENABLED(CONFIG_IPV6) |
55a48c7e | 712 | xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); |
e6ce6457 | 713 | #endif |
87e66b96 XL |
714 | xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); |
715 | #endif | |
1990e4f8 MK |
716 | xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); |
717 | xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); | |
718 | xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); | |
1181412c S |
719 | unregister_pernet_device(&vti_net_ops); |
720 | } | |
721 | ||
722 | module_init(vti_init); | |
723 | module_exit(vti_fini); | |
724 | MODULE_LICENSE("GPL"); | |
725 | MODULE_ALIAS_RTNL_LINK("vti"); | |
726 | MODULE_ALIAS_NETDEV("ip_vti0"); |