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Commit | Line | Data |
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1181412c S |
1 | /* |
2 | * Linux NET3: IP/IP protocol decoder modified to support | |
3 | * virtual tunnel interface | |
4 | * | |
5 | * Authors: | |
6 | * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012 | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | /* | |
16 | This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c | |
17 | ||
18 | For comments look at net/ipv4/ip_gre.c --ANK | |
19 | */ | |
20 | ||
21 | ||
22 | #include <linux/capability.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/tcp.h> | |
31 | #include <linux/udp.h> | |
32 | #include <linux/if_arp.h> | |
1181412c S |
33 | #include <linux/init.h> |
34 | #include <linux/netfilter_ipv4.h> | |
35 | #include <linux/if_ether.h> | |
78a010cc | 36 | #include <linux/icmpv6.h> |
1181412c S |
37 | |
38 | #include <net/sock.h> | |
39 | #include <net/ip.h> | |
40 | #include <net/icmp.h> | |
c5441932 | 41 | #include <net/ip_tunnels.h> |
1181412c S |
42 | #include <net/inet_ecn.h> |
43 | #include <net/xfrm.h> | |
44 | #include <net/net_namespace.h> | |
45 | #include <net/netns/generic.h> | |
46 | ||
1181412c S |
47 | static struct rtnl_link_ops vti_link_ops __read_mostly; |
48 | ||
c7d03a00 | 49 | static unsigned int vti_net_id __read_mostly; |
1181412c | 50 | static int vti_tunnel_init(struct net_device *dev); |
1181412c | 51 | |
df3893c1 SK |
52 | static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi, |
53 | int encap_type) | |
1181412c S |
54 | { |
55 | struct ip_tunnel *tunnel; | |
56 | const struct iphdr *iph = ip_hdr(skb); | |
b9959fd3 AW |
57 | struct net *net = dev_net(skb->dev); |
58 | struct ip_tunnel_net *itn = net_generic(net, vti_net_id); | |
1181412c | 59 | |
b9959fd3 AW |
60 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, |
61 | iph->saddr, iph->daddr, 0); | |
00db4124 | 62 | if (tunnel) { |
df3893c1 SK |
63 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
64 | goto drop; | |
65 | ||
66 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel; | |
df3893c1 SK |
67 | |
68 | return xfrm_input(skb, nexthdr, spi, encap_type); | |
69 | } | |
70 | ||
71 | return -EINVAL; | |
72 | drop: | |
73 | kfree_skb(skb); | |
74 | return 0; | |
75 | } | |
76 | ||
dd9ee344 SY |
77 | static int vti_input_ipip(struct sk_buff *skb, int nexthdr, __be32 spi, |
78 | int encap_type) | |
79 | { | |
80 | struct ip_tunnel *tunnel; | |
81 | const struct iphdr *iph = ip_hdr(skb); | |
82 | struct net *net = dev_net(skb->dev); | |
83 | struct ip_tunnel_net *itn = net_generic(net, vti_net_id); | |
84 | ||
85 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, | |
86 | iph->saddr, iph->daddr, 0); | |
87 | if (tunnel) { | |
88 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
89 | goto drop; | |
90 | ||
91 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel; | |
92 | ||
93 | skb->dev = tunnel->dev; | |
94 | ||
95 | return xfrm_input(skb, nexthdr, spi, encap_type); | |
96 | } | |
97 | ||
98 | return -EINVAL; | |
99 | drop: | |
100 | kfree_skb(skb); | |
101 | return 0; | |
102 | } | |
103 | ||
df3893c1 SK |
104 | static int vti_rcv(struct sk_buff *skb) |
105 | { | |
106 | XFRM_SPI_SKB_CB(skb)->family = AF_INET; | |
107 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); | |
108 | ||
109 | return vti_input(skb, ip_hdr(skb)->protocol, 0, 0); | |
110 | } | |
111 | ||
dd9ee344 SY |
112 | static int vti_rcv_ipip(struct sk_buff *skb) |
113 | { | |
114 | XFRM_SPI_SKB_CB(skb)->family = AF_INET; | |
115 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); | |
116 | ||
117 | return vti_input_ipip(skb, ip_hdr(skb)->protocol, ip_hdr(skb)->saddr, 0); | |
118 | } | |
119 | ||
df3893c1 SK |
120 | static int vti_rcv_cb(struct sk_buff *skb, int err) |
121 | { | |
122 | unsigned short family; | |
123 | struct net_device *dev; | |
124 | struct pcpu_sw_netstats *tstats; | |
125 | struct xfrm_state *x; | |
1fb81e09 | 126 | struct xfrm_mode *inner_mode; |
df3893c1 | 127 | struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4; |
d55c670c AD |
128 | u32 orig_mark = skb->mark; |
129 | int ret; | |
df3893c1 SK |
130 | |
131 | if (!tunnel) | |
1181412c | 132 | return 1; |
df3893c1 SK |
133 | |
134 | dev = tunnel->dev; | |
135 | ||
136 | if (err) { | |
137 | dev->stats.rx_errors++; | |
138 | dev->stats.rx_dropped++; | |
139 | ||
140 | return 0; | |
1181412c | 141 | } |
1181412c | 142 | |
df3893c1 | 143 | x = xfrm_input_state(skb); |
1fb81e09 | 144 | |
145 | inner_mode = x->inner_mode; | |
146 | ||
147 | if (x->sel.family == AF_UNSPEC) { | |
148 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
149 | if (inner_mode == NULL) { | |
150 | XFRM_INC_STATS(dev_net(skb->dev), | |
151 | LINUX_MIB_XFRMINSTATEMODEERROR); | |
152 | return -EINVAL; | |
153 | } | |
154 | } | |
155 | ||
156 | family = inner_mode->afinfo->family; | |
df3893c1 | 157 | |
d55c670c AD |
158 | skb->mark = be32_to_cpu(tunnel->parms.i_key); |
159 | ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); | |
160 | skb->mark = orig_mark; | |
161 | ||
162 | if (!ret) | |
df3893c1 SK |
163 | return -EPERM; |
164 | ||
165 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev))); | |
166 | skb->dev = dev; | |
167 | ||
168 | tstats = this_cpu_ptr(dev->tstats); | |
169 | ||
170 | u64_stats_update_begin(&tstats->syncp); | |
171 | tstats->rx_packets++; | |
172 | tstats->rx_bytes += skb->len; | |
173 | u64_stats_update_end(&tstats->syncp); | |
174 | ||
175 | return 0; | |
1181412c S |
176 | } |
177 | ||
6e2de802 SK |
178 | static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src) |
179 | { | |
180 | xfrm_address_t *daddr = (xfrm_address_t *)&dst; | |
181 | xfrm_address_t *saddr = (xfrm_address_t *)&src; | |
182 | ||
183 | /* if there is no transform then this tunnel is not functional. | |
184 | * Or if the xfrm is not mode tunnel. | |
185 | */ | |
186 | if (!x || x->props.mode != XFRM_MODE_TUNNEL || | |
187 | x->props.family != AF_INET) | |
188 | return false; | |
189 | ||
190 | if (!dst) | |
191 | return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET); | |
192 | ||
193 | if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET)) | |
194 | return false; | |
195 | ||
196 | return true; | |
197 | } | |
198 | ||
78a010cc SK |
199 | static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, |
200 | struct flowi *fl) | |
1181412c S |
201 | { |
202 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
6e2de802 | 203 | struct ip_tunnel_parm *parms = &tunnel->parms; |
a34cd4f3 | 204 | struct dst_entry *dst = skb_dst(skb); |
1181412c | 205 | struct net_device *tdev; /* Device to other host */ |
36f6ee22 | 206 | int pkt_len = skb->len; |
b9959fd3 | 207 | int err; |
d6af1a31 | 208 | int mtu; |
1181412c | 209 | |
a34cd4f3 | 210 | if (!dst) { |
df3893c1 SK |
211 | dev->stats.tx_carrier_errors++; |
212 | goto tx_error_icmp; | |
213 | } | |
1181412c | 214 | |
a34cd4f3 | 215 | dst_hold(dst); |
78a010cc | 216 | dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0); |
a34cd4f3 | 217 | if (IS_ERR(dst)) { |
1181412c S |
218 | dev->stats.tx_carrier_errors++; |
219 | goto tx_error_icmp; | |
220 | } | |
df3893c1 | 221 | |
6e2de802 | 222 | if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) { |
1181412c | 223 | dev->stats.tx_carrier_errors++; |
a34cd4f3 | 224 | dst_release(dst); |
1181412c S |
225 | goto tx_error_icmp; |
226 | } | |
6e2de802 | 227 | |
a34cd4f3 | 228 | tdev = dst->dev; |
1181412c S |
229 | |
230 | if (tdev == dev) { | |
a34cd4f3 | 231 | dst_release(dst); |
1181412c S |
232 | dev->stats.collisions++; |
233 | goto tx_error; | |
234 | } | |
235 | ||
d6af1a31 SK |
236 | mtu = dst_mtu(dst); |
237 | if (skb->len > mtu) { | |
f15ca723 | 238 | skb_dst_update_pmtu(skb, mtu); |
d6af1a31 SK |
239 | if (skb->protocol == htons(ETH_P_IP)) { |
240 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, | |
241 | htonl(mtu)); | |
242 | } else { | |
243 | if (mtu < IPV6_MIN_MTU) | |
244 | mtu = IPV6_MIN_MTU; | |
245 | ||
246 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
247 | } | |
248 | ||
249 | dst_release(dst); | |
250 | goto tx_error; | |
251 | } | |
252 | ||
df3893c1 | 253 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); |
a34cd4f3 | 254 | skb_dst_set(skb, dst); |
1181412c S |
255 | skb->dev = skb_dst(skb)->dev; |
256 | ||
13206b6b | 257 | err = dst_output(tunnel->net, skb->sk, skb); |
b9959fd3 | 258 | if (net_xmit_eval(err) == 0) |
36f6ee22 | 259 | err = pkt_len; |
039f5062 | 260 | iptunnel_xmit_stats(dev, err); |
1181412c S |
261 | return NETDEV_TX_OK; |
262 | ||
263 | tx_error_icmp: | |
264 | dst_link_failure(skb); | |
265 | tx_error: | |
266 | dev->stats.tx_errors++; | |
3acfa1e7 | 267 | kfree_skb(skb); |
1181412c S |
268 | return NETDEV_TX_OK; |
269 | } | |
270 | ||
78a010cc SK |
271 | /* This function assumes it is being called from dev_queue_xmit() |
272 | * and that skb is filled properly by that function. | |
273 | */ | |
274 | static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
275 | { | |
276 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
277 | struct flowi fl; | |
278 | ||
cb9f1b78 WB |
279 | if (!pskb_inet_may_pull(skb)) |
280 | goto tx_err; | |
281 | ||
78a010cc SK |
282 | memset(&fl, 0, sizeof(fl)); |
283 | ||
78a010cc SK |
284 | switch (skb->protocol) { |
285 | case htons(ETH_P_IP): | |
286 | xfrm_decode_session(skb, &fl, AF_INET); | |
287 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
288 | break; | |
289 | case htons(ETH_P_IPV6): | |
290 | xfrm_decode_session(skb, &fl, AF_INET6); | |
291 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
292 | break; | |
293 | default: | |
cb9f1b78 | 294 | goto tx_err; |
78a010cc SK |
295 | } |
296 | ||
cd5279c1 AD |
297 | /* override mark with tunnel output key */ |
298 | fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key); | |
299 | ||
78a010cc | 300 | return vti_xmit(skb, dev, &fl); |
cb9f1b78 WB |
301 | |
302 | tx_err: | |
303 | dev->stats.tx_errors++; | |
304 | kfree_skb(skb); | |
305 | return NETDEV_TX_OK; | |
78a010cc SK |
306 | } |
307 | ||
df3893c1 SK |
308 | static int vti4_err(struct sk_buff *skb, u32 info) |
309 | { | |
310 | __be32 spi; | |
6d004d6c | 311 | __u32 mark; |
df3893c1 SK |
312 | struct xfrm_state *x; |
313 | struct ip_tunnel *tunnel; | |
314 | struct ip_esp_hdr *esph; | |
315 | struct ip_auth_hdr *ah ; | |
316 | struct ip_comp_hdr *ipch; | |
317 | struct net *net = dev_net(skb->dev); | |
318 | const struct iphdr *iph = (const struct iphdr *)skb->data; | |
319 | int protocol = iph->protocol; | |
320 | struct ip_tunnel_net *itn = net_generic(net, vti_net_id); | |
321 | ||
322 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, | |
323 | iph->daddr, iph->saddr, 0); | |
324 | if (!tunnel) | |
325 | return -1; | |
326 | ||
6d004d6c SK |
327 | mark = be32_to_cpu(tunnel->parms.o_key); |
328 | ||
df3893c1 SK |
329 | switch (protocol) { |
330 | case IPPROTO_ESP: | |
331 | esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); | |
332 | spi = esph->spi; | |
333 | break; | |
334 | case IPPROTO_AH: | |
335 | ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); | |
336 | spi = ah->spi; | |
337 | break; | |
338 | case IPPROTO_COMP: | |
339 | ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); | |
340 | spi = htonl(ntohs(ipch->cpi)); | |
341 | break; | |
342 | default: | |
343 | return 0; | |
344 | } | |
345 | ||
346 | switch (icmp_hdr(skb)->type) { | |
347 | case ICMP_DEST_UNREACH: | |
348 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) | |
349 | return 0; | |
350 | case ICMP_REDIRECT: | |
351 | break; | |
352 | default: | |
353 | return 0; | |
354 | } | |
355 | ||
6d004d6c | 356 | x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, |
df3893c1 SK |
357 | spi, protocol, AF_INET); |
358 | if (!x) | |
359 | return 0; | |
360 | ||
361 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) | |
d888f396 | 362 | ipv4_update_pmtu(skb, net, info, 0, protocol); |
df3893c1 | 363 | else |
1042caa7 | 364 | ipv4_redirect(skb, net, 0, protocol); |
df3893c1 SK |
365 | xfrm_state_put(x); |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
1181412c S |
370 | static int |
371 | vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
372 | { | |
373 | int err = 0; | |
374 | struct ip_tunnel_parm p; | |
1181412c | 375 | |
b9959fd3 AW |
376 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
377 | return -EFAULT; | |
1181412c | 378 | |
b9959fd3 | 379 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
1181412c S |
380 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP || |
381 | p.iph.ihl != 5) | |
b9959fd3 AW |
382 | return -EINVAL; |
383 | } | |
1181412c | 384 | |
7c8e6b9c DP |
385 | if (!(p.i_flags & GRE_KEY)) |
386 | p.i_key = 0; | |
387 | if (!(p.o_flags & GRE_KEY)) | |
388 | p.o_key = 0; | |
389 | ||
390 | p.i_flags = VTI_ISVTI; | |
391 | ||
b9959fd3 AW |
392 | err = ip_tunnel_ioctl(dev, &p, cmd); |
393 | if (err) | |
394 | return err; | |
1181412c | 395 | |
b9959fd3 | 396 | if (cmd != SIOCDELTUNNEL) { |
df3893c1 | 397 | p.i_flags |= GRE_KEY; |
b9959fd3 | 398 | p.o_flags |= GRE_KEY; |
1181412c S |
399 | } |
400 | ||
b9959fd3 AW |
401 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
402 | return -EFAULT; | |
1181412c S |
403 | return 0; |
404 | } | |
405 | ||
406 | static const struct net_device_ops vti_netdev_ops = { | |
407 | .ndo_init = vti_tunnel_init, | |
b9959fd3 | 408 | .ndo_uninit = ip_tunnel_uninit, |
1181412c S |
409 | .ndo_start_xmit = vti_tunnel_xmit, |
410 | .ndo_do_ioctl = vti_tunnel_ioctl, | |
b9959fd3 | 411 | .ndo_change_mtu = ip_tunnel_change_mtu, |
f61dd388 | 412 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
1e99584b | 413 | .ndo_get_iflink = ip_tunnel_get_iflink, |
1181412c S |
414 | }; |
415 | ||
b9959fd3 | 416 | static void vti_tunnel_setup(struct net_device *dev) |
1181412c | 417 | { |
b9959fd3 | 418 | dev->netdev_ops = &vti_netdev_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 = { |
1181412c | 450 | .handler = vti_rcv, |
df3893c1 SK |
451 | .input_handler = vti_input, |
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 = { | |
458 | .handler = vti_rcv, | |
459 | .input_handler = vti_input, | |
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 = { | |
466 | .handler = vti_rcv, | |
467 | .input_handler = vti_input, | |
468 | .cb_handler = vti_rcv_cb, | |
469 | .err_handler = vti4_err, | |
470 | .priority = 100, | |
1181412c S |
471 | }; |
472 | ||
dd9ee344 SY |
473 | static struct xfrm_tunnel ipip_handler __read_mostly = { |
474 | .handler = vti_rcv_ipip, | |
475 | .err_handler = vti4_err, | |
476 | .priority = 0, | |
477 | }; | |
478 | ||
1181412c S |
479 | static int __net_init vti_init_net(struct net *net) |
480 | { | |
481 | int err; | |
b9959fd3 | 482 | struct ip_tunnel_net *itn; |
1181412c | 483 | |
b9959fd3 | 484 | err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0"); |
1181412c | 485 | if (err) |
b9959fd3 AW |
486 | return err; |
487 | itn = net_generic(net, vti_net_id); | |
cd1aa9c2 HY |
488 | if (itn->fb_tunnel_dev) |
489 | vti_fb_tunnel_init(itn->fb_tunnel_dev); | |
1181412c | 490 | return 0; |
1181412c S |
491 | } |
492 | ||
64bc1781 | 493 | static void __net_exit vti_exit_batch_net(struct list_head *list_net) |
1181412c | 494 | { |
64bc1781 | 495 | ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops); |
1181412c S |
496 | } |
497 | ||
498 | static struct pernet_operations vti_net_ops = { | |
499 | .init = vti_init_net, | |
64bc1781 | 500 | .exit_batch = vti_exit_batch_net, |
1181412c | 501 | .id = &vti_net_id, |
b9959fd3 | 502 | .size = sizeof(struct ip_tunnel_net), |
1181412c S |
503 | }; |
504 | ||
a8b8a889 MS |
505 | static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
506 | struct netlink_ext_ack *extack) | |
1181412c S |
507 | { |
508 | return 0; | |
509 | } | |
510 | ||
511 | static void vti_netlink_parms(struct nlattr *data[], | |
9830ad4c CG |
512 | struct ip_tunnel_parm *parms, |
513 | __u32 *fwmark) | |
1181412c S |
514 | { |
515 | memset(parms, 0, sizeof(*parms)); | |
516 | ||
517 | parms->iph.protocol = IPPROTO_IPIP; | |
518 | ||
519 | if (!data) | |
520 | return; | |
521 | ||
df3893c1 SK |
522 | parms->i_flags = VTI_ISVTI; |
523 | ||
1181412c S |
524 | if (data[IFLA_VTI_LINK]) |
525 | parms->link = nla_get_u32(data[IFLA_VTI_LINK]); | |
526 | ||
527 | if (data[IFLA_VTI_IKEY]) | |
528 | parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); | |
529 | ||
530 | if (data[IFLA_VTI_OKEY]) | |
531 | parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); | |
532 | ||
533 | if (data[IFLA_VTI_LOCAL]) | |
67b61f6c | 534 | parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]); |
1181412c S |
535 | |
536 | if (data[IFLA_VTI_REMOTE]) | |
67b61f6c | 537 | parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]); |
1181412c | 538 | |
9830ad4c CG |
539 | if (data[IFLA_VTI_FWMARK]) |
540 | *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); | |
1181412c S |
541 | } |
542 | ||
543 | static int vti_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
544 | struct nlattr *tb[], struct nlattr *data[], |
545 | struct netlink_ext_ack *extack) | |
1181412c | 546 | { |
b9959fd3 | 547 | struct ip_tunnel_parm parms; |
9830ad4c | 548 | __u32 fwmark = 0; |
1181412c | 549 | |
9830ad4c CG |
550 | vti_netlink_parms(data, &parms, &fwmark); |
551 | return ip_tunnel_newlink(dev, tb, &parms, fwmark); | |
1181412c S |
552 | } |
553 | ||
554 | static int vti_changelink(struct net_device *dev, struct nlattr *tb[], | |
ad744b22 MS |
555 | struct nlattr *data[], |
556 | struct netlink_ext_ack *extack) | |
1181412c | 557 | { |
9830ad4c CG |
558 | struct ip_tunnel *t = netdev_priv(dev); |
559 | __u32 fwmark = t->fwmark; | |
1181412c | 560 | struct ip_tunnel_parm p; |
1181412c | 561 | |
9830ad4c CG |
562 | vti_netlink_parms(data, &p, &fwmark); |
563 | return ip_tunnel_changelink(dev, tb, &p, fwmark); | |
1181412c S |
564 | } |
565 | ||
566 | static size_t vti_get_size(const struct net_device *dev) | |
567 | { | |
568 | return | |
569 | /* IFLA_VTI_LINK */ | |
570 | nla_total_size(4) + | |
571 | /* IFLA_VTI_IKEY */ | |
572 | nla_total_size(4) + | |
573 | /* IFLA_VTI_OKEY */ | |
574 | nla_total_size(4) + | |
575 | /* IFLA_VTI_LOCAL */ | |
576 | nla_total_size(4) + | |
577 | /* IFLA_VTI_REMOTE */ | |
578 | nla_total_size(4) + | |
9830ad4c CG |
579 | /* IFLA_VTI_FWMARK */ |
580 | nla_total_size(4) + | |
1181412c S |
581 | 0; |
582 | } | |
583 | ||
584 | static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
585 | { | |
586 | struct ip_tunnel *t = netdev_priv(dev); | |
587 | struct ip_tunnel_parm *p = &t->parms; | |
588 | ||
8ed508fd HL |
589 | if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) || |
590 | nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) || | |
591 | nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) || | |
592 | nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) || | |
593 | nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) || | |
594 | nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark)) | |
595 | return -EMSGSIZE; | |
1181412c S |
596 | |
597 | return 0; | |
598 | } | |
599 | ||
600 | static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = { | |
601 | [IFLA_VTI_LINK] = { .type = NLA_U32 }, | |
602 | [IFLA_VTI_IKEY] = { .type = NLA_U32 }, | |
603 | [IFLA_VTI_OKEY] = { .type = NLA_U32 }, | |
604 | [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
605 | [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
9830ad4c | 606 | [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, |
1181412c S |
607 | }; |
608 | ||
609 | static struct rtnl_link_ops vti_link_ops __read_mostly = { | |
610 | .kind = "vti", | |
611 | .maxtype = IFLA_VTI_MAX, | |
612 | .policy = vti_policy, | |
613 | .priv_size = sizeof(struct ip_tunnel), | |
614 | .setup = vti_tunnel_setup, | |
615 | .validate = vti_tunnel_validate, | |
616 | .newlink = vti_newlink, | |
617 | .changelink = vti_changelink, | |
20ea60ca | 618 | .dellink = ip_tunnel_dellink, |
1181412c S |
619 | .get_size = vti_get_size, |
620 | .fill_info = vti_fill_info, | |
1728d4fa | 621 | .get_link_net = ip_tunnel_get_link_net, |
1181412c S |
622 | }; |
623 | ||
624 | static int __init vti_init(void) | |
625 | { | |
1990e4f8 | 626 | const char *msg; |
1181412c S |
627 | int err; |
628 | ||
1990e4f8 | 629 | pr_info("IPv4 over IPsec tunneling driver\n"); |
1181412c | 630 | |
1990e4f8 | 631 | msg = "tunnel device"; |
1181412c S |
632 | err = register_pernet_device(&vti_net_ops); |
633 | if (err < 0) | |
1990e4f8 | 634 | goto pernet_dev_failed; |
df3893c1 | 635 | |
1990e4f8 MK |
636 | msg = "tunnel protocols"; |
637 | err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP); | |
638 | if (err < 0) | |
639 | goto xfrm_proto_esp_failed; | |
df3893c1 | 640 | err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH); |
1990e4f8 MK |
641 | if (err < 0) |
642 | goto xfrm_proto_ah_failed; | |
df3893c1 | 643 | err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP); |
1990e4f8 MK |
644 | if (err < 0) |
645 | goto xfrm_proto_comp_failed; | |
1181412c | 646 | |
dd9ee344 SY |
647 | msg = "ipip tunnel"; |
648 | err = xfrm4_tunnel_register(&ipip_handler, AF_INET); | |
649 | if (err < 0) { | |
650 | pr_info("%s: cant't register tunnel\n",__func__); | |
651 | goto xfrm_tunnel_failed; | |
652 | } | |
653 | ||
1990e4f8 | 654 | msg = "netlink interface"; |
1181412c S |
655 | err = rtnl_link_register(&vti_link_ops); |
656 | if (err < 0) | |
657 | goto rtnl_link_failed; | |
658 | ||
659 | return err; | |
660 | ||
661 | rtnl_link_failed: | |
df3893c1 | 662 | xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); |
dd9ee344 SY |
663 | xfrm_tunnel_failed: |
664 | xfrm4_tunnel_deregister(&ipip_handler, AF_INET); | |
1990e4f8 | 665 | xfrm_proto_comp_failed: |
df3893c1 | 666 | xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); |
1990e4f8 | 667 | xfrm_proto_ah_failed: |
df3893c1 | 668 | xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); |
1990e4f8 | 669 | xfrm_proto_esp_failed: |
1181412c | 670 | unregister_pernet_device(&vti_net_ops); |
1990e4f8 MK |
671 | pernet_dev_failed: |
672 | pr_err("vti init: failed to register %s\n", msg); | |
1181412c S |
673 | return err; |
674 | } | |
675 | ||
676 | static void __exit vti_fini(void) | |
677 | { | |
678 | rtnl_link_unregister(&vti_link_ops); | |
1990e4f8 MK |
679 | xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); |
680 | xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); | |
681 | xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); | |
1181412c S |
682 | unregister_pernet_device(&vti_net_ops); |
683 | } | |
684 | ||
685 | module_init(vti_init); | |
686 | module_exit(vti_fini); | |
687 | MODULE_LICENSE("GPL"); | |
688 | MODULE_ALIAS_RTNL_LINK("vti"); | |
689 | MODULE_ALIAS_NETDEV("ip_vti0"); |