Commit | Line | Data |
---|---|---|
406ef77c HX |
1 | /* |
2 | * xfrm_output.c - Common IPsec encapsulation code. | |
3 | * | |
4 | * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/netdevice.h> | |
862b82c6 | 15 | #include <linux/netfilter.h> |
406ef77c | 16 | #include <linux/skbuff.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
406ef77c | 18 | #include <linux/spinlock.h> |
406ef77c | 19 | #include <net/dst.h> |
1de70830 | 20 | #include <net/inet_ecn.h> |
406ef77c HX |
21 | #include <net/xfrm.h> |
22 | ||
1de70830 FW |
23 | #include "xfrm_inout.h" |
24 | ||
0c4b51f0 | 25 | static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb); |
0c620e97 | 26 | static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); |
c6581a45 | 27 | |
26b2072e | 28 | static int xfrm_skb_check_space(struct sk_buff *skb) |
83815dea | 29 | { |
adf30907 | 30 | struct dst_entry *dst = skb_dst(skb); |
550ade84 | 31 | int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev) |
83815dea | 32 | - skb_headroom(skb); |
f5184d26 | 33 | int ntail = dst->dev->needed_tailroom - skb_tailroom(skb); |
83815dea | 34 | |
d01dbeb6 HX |
35 | if (nhead <= 0) { |
36 | if (ntail <= 0) | |
37 | return 0; | |
38 | nhead = 0; | |
39 | } else if (ntail < 0) | |
40 | ntail = 0; | |
41 | ||
42 | return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC); | |
83815dea HX |
43 | } |
44 | ||
9449c3cd YX |
45 | /* Children define the path of the packet through the |
46 | * Linux networking. Thus, destinations are stackable. | |
47 | */ | |
48 | ||
49 | static struct dst_entry *skb_dst_pop(struct sk_buff *skb) | |
50 | { | |
b92cf4aa | 51 | struct dst_entry *child = dst_clone(xfrm_dst_child(skb_dst(skb))); |
9449c3cd YX |
52 | |
53 | skb_dst_drop(skb); | |
54 | return child; | |
55 | } | |
56 | ||
0c620e97 FW |
57 | /* Add encapsulation header. |
58 | * | |
59 | * The IP header will be moved forward to make space for the encapsulation | |
60 | * header. | |
61 | */ | |
62 | static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) | |
63 | { | |
0c620e97 FW |
64 | struct iphdr *iph = ip_hdr(skb); |
65 | int ihl = iph->ihl * 4; | |
66 | ||
67 | skb_set_inner_transport_header(skb, skb_transport_offset(skb)); | |
68 | ||
69 | skb_set_network_header(skb, -x->props.header_len); | |
70 | skb->mac_header = skb->network_header + | |
71 | offsetof(struct iphdr, protocol); | |
72 | skb->transport_header = skb->network_header + ihl; | |
73 | __skb_pull(skb, ihl); | |
74 | memmove(skb_network_header(skb), iph, ihl); | |
75 | return 0; | |
0c620e97 FW |
76 | } |
77 | ||
78 | /* Add encapsulation header. | |
79 | * | |
80 | * The IP header and mutable extension headers will be moved forward to make | |
81 | * space for the encapsulation header. | |
82 | */ | |
83 | static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb) | |
84 | { | |
4c145dce | 85 | #if IS_ENABLED(CONFIG_IPV6) |
0c620e97 FW |
86 | struct ipv6hdr *iph; |
87 | u8 *prevhdr; | |
88 | int hdr_len; | |
89 | ||
90 | iph = ipv6_hdr(skb); | |
91 | skb_set_inner_transport_header(skb, skb_transport_offset(skb)); | |
92 | ||
93 | hdr_len = x->type->hdr_offset(x, skb, &prevhdr); | |
94 | if (hdr_len < 0) | |
95 | return hdr_len; | |
96 | skb_set_mac_header(skb, | |
97 | (prevhdr - x->props.header_len) - skb->data); | |
98 | skb_set_network_header(skb, -x->props.header_len); | |
99 | skb->transport_header = skb->network_header + hdr_len; | |
100 | __skb_pull(skb, hdr_len); | |
101 | memmove(ipv6_hdr(skb), iph, hdr_len); | |
102 | return 0; | |
103 | #else | |
104 | WARN_ON_ONCE(1); | |
4c145dce | 105 | return -EAFNOSUPPORT; |
0c620e97 FW |
106 | #endif |
107 | } | |
108 | ||
109 | /* Add route optimization header space. | |
110 | * | |
111 | * The IP header and mutable extension headers will be moved forward to make | |
112 | * space for the route optimization header. | |
113 | */ | |
114 | static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb) | |
115 | { | |
4c145dce | 116 | #if IS_ENABLED(CONFIG_IPV6) |
0c620e97 FW |
117 | struct ipv6hdr *iph; |
118 | u8 *prevhdr; | |
119 | int hdr_len; | |
120 | ||
121 | iph = ipv6_hdr(skb); | |
122 | ||
123 | hdr_len = x->type->hdr_offset(x, skb, &prevhdr); | |
124 | if (hdr_len < 0) | |
125 | return hdr_len; | |
126 | skb_set_mac_header(skb, | |
127 | (prevhdr - x->props.header_len) - skb->data); | |
128 | skb_set_network_header(skb, -x->props.header_len); | |
129 | skb->transport_header = skb->network_header + hdr_len; | |
130 | __skb_pull(skb, hdr_len); | |
131 | memmove(ipv6_hdr(skb), iph, hdr_len); | |
132 | ||
133 | x->lastused = ktime_get_real_seconds(); | |
134 | ||
135 | return 0; | |
136 | #else | |
137 | WARN_ON_ONCE(1); | |
4c145dce | 138 | return -EAFNOSUPPORT; |
0c620e97 FW |
139 | #endif |
140 | } | |
141 | ||
1de70830 FW |
142 | /* Add encapsulation header. |
143 | * | |
144 | * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt. | |
145 | */ | |
146 | static int xfrm4_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb) | |
147 | { | |
148 | struct ip_beet_phdr *ph; | |
149 | struct iphdr *top_iph; | |
150 | int hdrlen, optlen; | |
151 | ||
152 | hdrlen = 0; | |
153 | optlen = XFRM_MODE_SKB_CB(skb)->optlen; | |
154 | if (unlikely(optlen)) | |
155 | hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4); | |
156 | ||
157 | skb_set_network_header(skb, -x->props.header_len - hdrlen + | |
158 | (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph))); | |
159 | if (x->sel.family != AF_INET6) | |
160 | skb->network_header += IPV4_BEET_PHMAXLEN; | |
161 | skb->mac_header = skb->network_header + | |
162 | offsetof(struct iphdr, protocol); | |
163 | skb->transport_header = skb->network_header + sizeof(*top_iph); | |
164 | ||
165 | xfrm4_beet_make_header(skb); | |
166 | ||
167 | ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen); | |
168 | ||
169 | top_iph = ip_hdr(skb); | |
170 | ||
171 | if (unlikely(optlen)) { | |
172 | if (WARN_ON(optlen < 0)) | |
173 | return -EINVAL; | |
174 | ||
175 | ph->padlen = 4 - (optlen & 4); | |
176 | ph->hdrlen = optlen / 8; | |
177 | ph->nexthdr = top_iph->protocol; | |
178 | if (ph->padlen) | |
179 | memset(ph + 1, IPOPT_NOP, ph->padlen); | |
180 | ||
181 | top_iph->protocol = IPPROTO_BEETPH; | |
182 | top_iph->ihl = sizeof(struct iphdr) / 4; | |
183 | } | |
184 | ||
185 | top_iph->saddr = x->props.saddr.a4; | |
186 | top_iph->daddr = x->id.daddr.a4; | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | /* Add encapsulation header. | |
192 | * | |
193 | * The top IP header will be constructed per RFC 2401. | |
194 | */ | |
195 | static int xfrm4_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb) | |
196 | { | |
197 | struct dst_entry *dst = skb_dst(skb); | |
198 | struct iphdr *top_iph; | |
199 | int flags; | |
200 | ||
201 | skb_set_inner_network_header(skb, skb_network_offset(skb)); | |
202 | skb_set_inner_transport_header(skb, skb_transport_offset(skb)); | |
203 | ||
204 | skb_set_network_header(skb, -x->props.header_len); | |
205 | skb->mac_header = skb->network_header + | |
206 | offsetof(struct iphdr, protocol); | |
207 | skb->transport_header = skb->network_header + sizeof(*top_iph); | |
208 | top_iph = ip_hdr(skb); | |
209 | ||
210 | top_iph->ihl = 5; | |
211 | top_iph->version = 4; | |
212 | ||
213 | top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family); | |
214 | ||
215 | /* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */ | |
216 | if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) | |
217 | top_iph->tos = 0; | |
218 | else | |
219 | top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos; | |
220 | top_iph->tos = INET_ECN_encapsulate(top_iph->tos, | |
221 | XFRM_MODE_SKB_CB(skb)->tos); | |
222 | ||
223 | flags = x->props.flags; | |
224 | if (flags & XFRM_STATE_NOECN) | |
225 | IP_ECN_clear(top_iph); | |
226 | ||
227 | top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ? | |
228 | 0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF)); | |
229 | ||
230 | top_iph->ttl = ip4_dst_hoplimit(xfrm_dst_child(dst)); | |
231 | ||
232 | top_iph->saddr = x->props.saddr.a4; | |
233 | top_iph->daddr = x->id.daddr.a4; | |
234 | ip_select_ident(dev_net(dst->dev), skb, NULL); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | #if IS_ENABLED(CONFIG_IPV6) | |
240 | static int xfrm6_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb) | |
241 | { | |
242 | struct dst_entry *dst = skb_dst(skb); | |
243 | struct ipv6hdr *top_iph; | |
244 | int dsfield; | |
245 | ||
246 | skb_set_inner_network_header(skb, skb_network_offset(skb)); | |
247 | skb_set_inner_transport_header(skb, skb_transport_offset(skb)); | |
248 | ||
249 | skb_set_network_header(skb, -x->props.header_len); | |
250 | skb->mac_header = skb->network_header + | |
251 | offsetof(struct ipv6hdr, nexthdr); | |
252 | skb->transport_header = skb->network_header + sizeof(*top_iph); | |
253 | top_iph = ipv6_hdr(skb); | |
254 | ||
255 | top_iph->version = 6; | |
256 | ||
257 | memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl, | |
258 | sizeof(top_iph->flow_lbl)); | |
259 | top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family); | |
260 | ||
261 | if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) | |
262 | dsfield = 0; | |
263 | else | |
264 | dsfield = XFRM_MODE_SKB_CB(skb)->tos; | |
265 | dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos); | |
266 | if (x->props.flags & XFRM_STATE_NOECN) | |
267 | dsfield &= ~INET_ECN_MASK; | |
268 | ipv6_change_dsfield(top_iph, 0, dsfield); | |
269 | top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst)); | |
270 | top_iph->saddr = *(struct in6_addr *)&x->props.saddr; | |
271 | top_iph->daddr = *(struct in6_addr *)&x->id.daddr; | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static int xfrm6_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb) | |
276 | { | |
277 | struct ipv6hdr *top_iph; | |
278 | struct ip_beet_phdr *ph; | |
279 | int optlen, hdr_len; | |
280 | ||
281 | hdr_len = 0; | |
282 | optlen = XFRM_MODE_SKB_CB(skb)->optlen; | |
283 | if (unlikely(optlen)) | |
284 | hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4); | |
285 | ||
286 | skb_set_network_header(skb, -x->props.header_len - hdr_len); | |
287 | if (x->sel.family != AF_INET6) | |
288 | skb->network_header += IPV4_BEET_PHMAXLEN; | |
289 | skb->mac_header = skb->network_header + | |
290 | offsetof(struct ipv6hdr, nexthdr); | |
291 | skb->transport_header = skb->network_header + sizeof(*top_iph); | |
292 | ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len); | |
293 | ||
294 | xfrm6_beet_make_header(skb); | |
295 | ||
296 | top_iph = ipv6_hdr(skb); | |
297 | if (unlikely(optlen)) { | |
298 | if (WARN_ON(optlen < 0)) | |
299 | return -EINVAL; | |
300 | ||
301 | ph->padlen = 4 - (optlen & 4); | |
302 | ph->hdrlen = optlen / 8; | |
303 | ph->nexthdr = top_iph->nexthdr; | |
304 | if (ph->padlen) | |
305 | memset(ph + 1, IPOPT_NOP, ph->padlen); | |
306 | ||
307 | top_iph->nexthdr = IPPROTO_BEETPH; | |
308 | } | |
309 | ||
310 | top_iph->saddr = *(struct in6_addr *)&x->props.saddr; | |
311 | top_iph->daddr = *(struct in6_addr *)&x->id.daddr; | |
312 | return 0; | |
313 | } | |
314 | #endif | |
315 | ||
316 | /* Add encapsulation header. | |
317 | * | |
318 | * On exit, the transport header will be set to the start of the | |
319 | * encapsulation header to be filled in by x->type->output and the mac | |
320 | * header will be set to the nextheader (protocol for IPv4) field of the | |
321 | * extension header directly preceding the encapsulation header, or in | |
322 | * its absence, that of the top IP header. | |
323 | * The value of the network header will always point to the top IP header | |
324 | * while skb->data will point to the payload. | |
325 | */ | |
0c620e97 FW |
326 | static int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb) |
327 | { | |
328 | int err; | |
329 | ||
330 | err = xfrm_inner_extract_output(x, skb); | |
331 | if (err) | |
332 | return err; | |
333 | ||
334 | IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE; | |
335 | skb->protocol = htons(ETH_P_IP); | |
336 | ||
1de70830 FW |
337 | switch (x->outer_mode->encap) { |
338 | case XFRM_MODE_BEET: | |
339 | return xfrm4_beet_encap_add(x, skb); | |
340 | case XFRM_MODE_TUNNEL: | |
341 | return xfrm4_tunnel_encap_add(x, skb); | |
342 | } | |
343 | ||
344 | WARN_ON_ONCE(1); | |
345 | return -EOPNOTSUPP; | |
0c620e97 FW |
346 | } |
347 | ||
348 | static int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb) | |
349 | { | |
350 | #if IS_ENABLED(CONFIG_IPV6) | |
351 | int err; | |
352 | ||
353 | err = xfrm_inner_extract_output(x, skb); | |
354 | if (err) | |
355 | return err; | |
356 | ||
357 | skb->ignore_df = 1; | |
358 | skb->protocol = htons(ETH_P_IPV6); | |
359 | ||
1de70830 FW |
360 | switch (x->outer_mode->encap) { |
361 | case XFRM_MODE_BEET: | |
362 | return xfrm6_beet_encap_add(x, skb); | |
363 | case XFRM_MODE_TUNNEL: | |
364 | return xfrm6_tunnel_encap_add(x, skb); | |
365 | default: | |
366 | WARN_ON_ONCE(1); | |
367 | return -EOPNOTSUPP; | |
368 | } | |
0c620e97 | 369 | #endif |
1de70830 FW |
370 | WARN_ON_ONCE(1); |
371 | return -EAFNOSUPPORT; | |
0c620e97 FW |
372 | } |
373 | ||
374 | static int xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb) | |
375 | { | |
376 | switch (x->outer_mode->encap) { | |
377 | case XFRM_MODE_BEET: | |
378 | case XFRM_MODE_TUNNEL: | |
379 | if (x->outer_mode->family == AF_INET) | |
380 | return xfrm4_prepare_output(x, skb); | |
381 | if (x->outer_mode->family == AF_INET6) | |
382 | return xfrm6_prepare_output(x, skb); | |
383 | break; | |
384 | case XFRM_MODE_TRANSPORT: | |
385 | if (x->outer_mode->family == AF_INET) | |
386 | return xfrm4_transport_output(x, skb); | |
387 | if (x->outer_mode->family == AF_INET6) | |
388 | return xfrm6_transport_output(x, skb); | |
389 | break; | |
390 | case XFRM_MODE_ROUTEOPTIMIZATION: | |
391 | if (x->outer_mode->family == AF_INET6) | |
392 | return xfrm6_ro_output(x, skb); | |
393 | WARN_ON_ONCE(1); | |
394 | break; | |
395 | default: | |
396 | WARN_ON_ONCE(1); | |
397 | break; | |
398 | } | |
399 | ||
400 | return -EOPNOTSUPP; | |
401 | } | |
402 | ||
403 | #if IS_ENABLED(CONFIG_NET_PKTGEN) | |
404 | int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb) | |
405 | { | |
406 | return xfrm_outer_mode_output(x, skb); | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(pktgen_xfrm_outer_mode_output); | |
409 | #endif | |
410 | ||
c6581a45 | 411 | static int xfrm_output_one(struct sk_buff *skb, int err) |
406ef77c | 412 | { |
adf30907 | 413 | struct dst_entry *dst = skb_dst(skb); |
406ef77c | 414 | struct xfrm_state *x = dst->xfrm; |
a6483b79 | 415 | struct net *net = xs_net(x); |
406ef77c | 416 | |
c6581a45 HX |
417 | if (err <= 0) |
418 | goto resume; | |
406ef77c HX |
419 | |
420 | do { | |
26b2072e | 421 | err = xfrm_skb_check_space(skb); |
b15c4bcd | 422 | if (err) { |
59c9940e | 423 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); |
910ef70a | 424 | goto error_nolock; |
b15c4bcd | 425 | } |
910ef70a | 426 | |
9b42c1f1 | 427 | skb->mark = xfrm_smark_get(skb->mark, x); |
077fbac4 | 428 | |
0c620e97 | 429 | err = xfrm_outer_mode_output(x, skb); |
b15c4bcd | 430 | if (err) { |
59c9940e | 431 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); |
910ef70a | 432 | goto error_nolock; |
b15c4bcd | 433 | } |
a2deb6d2 | 434 | |
406ef77c | 435 | spin_lock_bh(&x->lock); |
bb65a9cb LR |
436 | |
437 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { | |
438 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID); | |
497574c7 | 439 | err = -EINVAL; |
fa8599db | 440 | goto error; |
bb65a9cb LR |
441 | } |
442 | ||
910ef70a | 443 | err = xfrm_state_check_expire(x); |
b15c4bcd | 444 | if (err) { |
59c9940e | 445 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED); |
406ef77c | 446 | goto error; |
b15c4bcd | 447 | } |
406ef77c | 448 | |
9fdc4883 SK |
449 | err = x->repl->overflow(x, skb); |
450 | if (err) { | |
451 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR); | |
452 | goto error; | |
436a0a40 HX |
453 | } |
454 | ||
406ef77c HX |
455 | x->curlft.bytes += skb->len; |
456 | x->curlft.packets++; | |
457 | ||
406ef77c HX |
458 | spin_unlock_bh(&x->lock); |
459 | ||
3bc07321 | 460 | skb_dst_force(skb); |
9e143793 SK |
461 | if (!skb_dst(skb)) { |
462 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); | |
533555e5 | 463 | err = -EHOSTUNREACH; |
9e143793 SK |
464 | goto error_nolock; |
465 | } | |
3bc07321 | 466 | |
d77e38e6 SK |
467 | if (xfrm_offload(skb)) { |
468 | x->type_offload->encap(x, skb); | |
469 | } else { | |
73b9fc49 SK |
470 | /* Inner headers are invalid now. */ |
471 | skb->encapsulation = 0; | |
472 | ||
d77e38e6 SK |
473 | err = x->type->output(x, skb); |
474 | if (err == -EINPROGRESS) | |
475 | goto out; | |
476 | } | |
c6581a45 HX |
477 | |
478 | resume: | |
0aa64774 | 479 | if (err) { |
59c9940e | 480 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); |
b7c6538c | 481 | goto error_nolock; |
0aa64774 | 482 | } |
b7c6538c | 483 | |
8764ab2c | 484 | dst = skb_dst_pop(skb); |
adf30907 | 485 | if (!dst) { |
59c9940e | 486 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); |
406ef77c HX |
487 | err = -EHOSTUNREACH; |
488 | goto error_nolock; | |
489 | } | |
e433430a | 490 | skb_dst_set(skb, dst); |
406ef77c | 491 | x = dst->xfrm; |
13996378 | 492 | } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)); |
406ef77c | 493 | |
ebd4687a | 494 | return 0; |
406ef77c | 495 | |
406ef77c HX |
496 | error: |
497 | spin_unlock_bh(&x->lock); | |
862b82c6 HX |
498 | error_nolock: |
499 | kfree_skb(skb); | |
ebd4687a JS |
500 | out: |
501 | return err; | |
862b82c6 HX |
502 | } |
503 | ||
c6581a45 | 504 | int xfrm_output_resume(struct sk_buff *skb, int err) |
862b82c6 | 505 | { |
29a26a56 | 506 | struct net *net = xs_net(skb_dst(skb)->xfrm); |
be10de0a | 507 | |
c6581a45 | 508 | while (likely((err = xfrm_output_one(skb, err)) == 0)) { |
862b82c6 HX |
509 | nf_reset(skb); |
510 | ||
cf91a99d | 511 | err = skb_dst(skb)->ops->local_out(net, skb->sk, skb); |
862b82c6 | 512 | if (unlikely(err != 1)) |
c6581a45 | 513 | goto out; |
862b82c6 | 514 | |
adf30907 | 515 | if (!skb_dst(skb)->xfrm) |
13206b6b | 516 | return dst_output(net, skb->sk, skb); |
862b82c6 | 517 | |
adf30907 | 518 | err = nf_hook(skb_dst(skb)->ops->family, |
29a26a56 | 519 | NF_INET_POST_ROUTING, net, skb->sk, skb, |
adf30907 | 520 | NULL, skb_dst(skb)->dev, xfrm_output2); |
862b82c6 | 521 | if (unlikely(err != 1)) |
c6581a45 | 522 | goto out; |
862b82c6 HX |
523 | } |
524 | ||
c6581a45 HX |
525 | if (err == -EINPROGRESS) |
526 | err = 0; | |
527 | ||
528 | out: | |
862b82c6 HX |
529 | return err; |
530 | } | |
c6581a45 | 531 | EXPORT_SYMBOL_GPL(xfrm_output_resume); |
862b82c6 | 532 | |
0c4b51f0 | 533 | static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb) |
862b82c6 | 534 | { |
c6581a45 HX |
535 | return xfrm_output_resume(skb, 1); |
536 | } | |
862b82c6 | 537 | |
0c4b51f0 | 538 | static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb) |
c6581a45 HX |
539 | { |
540 | struct sk_buff *segs; | |
862b82c6 | 541 | |
9207f9d4 KK |
542 | BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_SGO_CB_OFFSET); |
543 | BUILD_BUG_ON(sizeof(*IP6CB(skb)) > SKB_SGO_CB_OFFSET); | |
862b82c6 HX |
544 | segs = skb_gso_segment(skb, 0); |
545 | kfree_skb(skb); | |
801678c5 | 546 | if (IS_ERR(segs)) |
862b82c6 | 547 | return PTR_ERR(segs); |
330966e5 FW |
548 | if (segs == NULL) |
549 | return -EINVAL; | |
862b82c6 HX |
550 | |
551 | do { | |
552 | struct sk_buff *nskb = segs->next; | |
553 | int err; | |
554 | ||
a8305bff | 555 | skb_mark_not_on_list(segs); |
0c4b51f0 | 556 | err = xfrm_output2(net, sk, segs); |
862b82c6 HX |
557 | |
558 | if (unlikely(err)) { | |
46cfd725 | 559 | kfree_skb_list(nskb); |
862b82c6 HX |
560 | return err; |
561 | } | |
562 | ||
563 | segs = nskb; | |
564 | } while (segs); | |
565 | ||
566 | return 0; | |
406ef77c | 567 | } |
c6581a45 | 568 | |
7026b1dd | 569 | int xfrm_output(struct sock *sk, struct sk_buff *skb) |
c6581a45 | 570 | { |
adf30907 | 571 | struct net *net = dev_net(skb_dst(skb)->dev); |
d77e38e6 | 572 | struct xfrm_state *x = skb_dst(skb)->xfrm; |
c6581a45 HX |
573 | int err; |
574 | ||
d77e38e6 SK |
575 | secpath_reset(skb); |
576 | ||
577 | if (xfrm_dev_offload_ok(skb, x)) { | |
578 | struct sec_path *sp; | |
579 | ||
a84e3f53 | 580 | sp = secpath_set(skb); |
d77e38e6 SK |
581 | if (!sp) { |
582 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); | |
583 | kfree_skb(skb); | |
584 | return -ENOMEM; | |
585 | } | |
f1bd7d65 | 586 | skb->encapsulation = 1; |
d77e38e6 SK |
587 | |
588 | sp->olen++; | |
a84e3f53 | 589 | sp->xvec[sp->len++] = x; |
d77e38e6 SK |
590 | xfrm_state_hold(x); |
591 | ||
592 | if (skb_is_gso(skb)) { | |
593 | skb_shinfo(skb)->gso_type |= SKB_GSO_ESP; | |
594 | ||
595 | return xfrm_output2(net, sk, skb); | |
596 | } | |
597 | ||
598 | if (x->xso.dev && x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM) | |
599 | goto out; | |
600 | } | |
601 | ||
c6581a45 | 602 | if (skb_is_gso(skb)) |
0c4b51f0 | 603 | return xfrm_output_gso(net, sk, skb); |
c6581a45 HX |
604 | |
605 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
606 | err = skb_checksum_help(skb); | |
607 | if (err) { | |
59c9940e | 608 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); |
c6581a45 HX |
609 | kfree_skb(skb); |
610 | return err; | |
611 | } | |
612 | } | |
613 | ||
d77e38e6 | 614 | out: |
0c4b51f0 | 615 | return xfrm_output2(net, sk, skb); |
c6581a45 | 616 | } |
fc68086c | 617 | EXPORT_SYMBOL_GPL(xfrm_output); |
df9dcb45 | 618 | |
0c620e97 | 619 | static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) |
df9dcb45 | 620 | { |
733a5fac | 621 | const struct xfrm_state_afinfo *afinfo; |
4c145dce | 622 | const struct xfrm_mode *inner_mode; |
733a5fac FW |
623 | int err = -EAFNOSUPPORT; |
624 | ||
df9dcb45 KM |
625 | if (x->sel.family == AF_UNSPEC) |
626 | inner_mode = xfrm_ip2inner_mode(x, | |
adf30907 | 627 | xfrm_af2proto(skb_dst(skb)->ops->family)); |
df9dcb45 KM |
628 | else |
629 | inner_mode = x->inner_mode; | |
630 | ||
631 | if (inner_mode == NULL) | |
632 | return -EAFNOSUPPORT; | |
733a5fac FW |
633 | |
634 | rcu_read_lock(); | |
635 | afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family); | |
636 | if (likely(afinfo)) | |
637 | err = afinfo->extract_output(x, skb); | |
638 | rcu_read_unlock(); | |
639 | ||
640 | return err; | |
df9dcb45 KM |
641 | } |
642 | ||
628e341f HFS |
643 | void xfrm_local_error(struct sk_buff *skb, int mtu) |
644 | { | |
844d4874 | 645 | unsigned int proto; |
628e341f HFS |
646 | struct xfrm_state_afinfo *afinfo; |
647 | ||
844d4874 HFS |
648 | if (skb->protocol == htons(ETH_P_IP)) |
649 | proto = AF_INET; | |
650 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
651 | proto = AF_INET6; | |
652 | else | |
653 | return; | |
654 | ||
655 | afinfo = xfrm_state_get_afinfo(proto); | |
46c0ef6e | 656 | if (afinfo) { |
af5d27c4 | 657 | afinfo->local_error(skb, mtu); |
46c0ef6e TY |
658 | rcu_read_unlock(); |
659 | } | |
628e341f | 660 | } |
628e341f | 661 | EXPORT_SYMBOL_GPL(xfrm_local_error); |