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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * xfrm6_policy.c: based on xfrm4_policy.c | |
3 | * | |
4 | * Authors: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki | |
10 | * Split up af-specific portion | |
11 | * | |
12 | */ | |
13 | ||
aabc9761 | 14 | #include <linux/compiler.h> |
aabc9761 HX |
15 | #include <linux/netdevice.h> |
16 | #include <net/addrconf.h> | |
1da177e4 LT |
17 | #include <net/xfrm.h> |
18 | #include <net/ip.h> | |
19 | #include <net/ipv6.h> | |
20 | #include <net/ip6_route.h> | |
2ce4272a MN |
21 | #ifdef CONFIG_IPV6_MIP6 |
22 | #include <net/mip6.h> | |
23 | #endif | |
1da177e4 LT |
24 | |
25 | static struct dst_ops xfrm6_dst_ops; | |
26 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo; | |
27 | ||
4251320f | 28 | static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl) |
1da177e4 | 29 | { |
4251320f VN |
30 | struct dst_entry *dst = ip6_route_output(NULL, fl); |
31 | int err = dst->error; | |
32 | if (!err) | |
33 | *xdst = (struct xfrm_dst *) dst; | |
34 | else | |
35 | dst_release(dst); | |
1da177e4 LT |
36 | return err; |
37 | } | |
38 | ||
a1e59abf PM |
39 | static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr) |
40 | { | |
41 | struct rt6_info *rt; | |
42 | struct flowi fl_tunnel = { | |
43 | .nl_u = { | |
44 | .ip6_u = { | |
45 | .daddr = *(struct in6_addr *)&daddr->a6, | |
46 | }, | |
47 | }, | |
48 | }; | |
49 | ||
50 | if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) { | |
51 | ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6, | |
52 | (struct in6_addr *)&saddr->a6); | |
53 | dst_release(&rt->u.dst); | |
54 | return 0; | |
55 | } | |
56 | return -EHOSTUNREACH; | |
57 | } | |
58 | ||
1da177e4 LT |
59 | static struct dst_entry * |
60 | __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy) | |
61 | { | |
62 | struct dst_entry *dst; | |
63 | ||
64 | /* Still not clear if we should set fl->fl6_{src,dst}... */ | |
65 | read_lock_bh(&policy->lock); | |
66 | for (dst = policy->bundles; dst; dst = dst->next) { | |
67 | struct xfrm_dst *xdst = (struct xfrm_dst*)dst; | |
68 | struct in6_addr fl_dst_prefix, fl_src_prefix; | |
69 | ||
70 | ipv6_addr_prefix(&fl_dst_prefix, | |
71 | &fl->fl6_dst, | |
72 | xdst->u.rt6.rt6i_dst.plen); | |
73 | ipv6_addr_prefix(&fl_src_prefix, | |
74 | &fl->fl6_src, | |
75 | xdst->u.rt6.rt6i_src.plen); | |
76 | if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) && | |
77 | ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) && | |
5b368e61 | 78 | xfrm_bundle_ok(policy, xdst, fl, AF_INET6, |
e53820de MN |
79 | (xdst->u.rt6.rt6i_dst.plen != 128 || |
80 | xdst->u.rt6.rt6i_src.plen != 128))) { | |
1da177e4 LT |
81 | dst_clone(dst); |
82 | break; | |
83 | } | |
84 | } | |
85 | read_unlock_bh(&policy->lock); | |
86 | return dst; | |
87 | } | |
88 | ||
99505a84 MN |
89 | static inline struct in6_addr* |
90 | __xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr) | |
91 | { | |
92 | return (x->type->remote_addr) ? | |
93 | (struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) : | |
94 | (struct in6_addr*)&x->id.daddr; | |
95 | } | |
96 | ||
97 | static inline struct in6_addr* | |
98 | __xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr) | |
99 | { | |
100 | return (x->type->local_addr) ? | |
101 | (struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) : | |
102 | (struct in6_addr*)&x->props.saddr; | |
103 | } | |
104 | ||
1b5c2299 MN |
105 | static inline void |
106 | __xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x) | |
107 | { | |
108 | if (x->type->flags & XFRM_TYPE_NON_FRAGMENT) | |
109 | *nflen += x->props.header_len; | |
110 | else | |
111 | *len += x->props.header_len; | |
112 | } | |
113 | ||
114 | static inline void | |
115 | __xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x) | |
116 | { | |
117 | if (x->type->flags & XFRM_TYPE_NON_FRAGMENT) | |
118 | *nflen -= x->props.header_len; | |
119 | else | |
120 | *len -= x->props.header_len; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
124 | * all the metrics... Shortly, bundle a bundle. | |
125 | */ | |
126 | ||
127 | static int | |
128 | __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
129 | struct flowi *fl, struct dst_entry **dst_p) | |
130 | { | |
131 | struct dst_entry *dst, *dst_prev; | |
132 | struct rt6_info *rt0 = (struct rt6_info*)(*dst_p); | |
133 | struct rt6_info *rt = rt0; | |
134 | struct in6_addr *remote = &fl->fl6_dst; | |
135 | struct in6_addr *local = &fl->fl6_src; | |
136 | struct flowi fl_tunnel = { | |
137 | .nl_u = { | |
138 | .ip6_u = { | |
139 | .saddr = *local, | |
140 | .daddr = *remote | |
141 | } | |
142 | } | |
143 | }; | |
144 | int i; | |
145 | int err = 0; | |
146 | int header_len = 0; | |
1b5c2299 | 147 | int nfheader_len = 0; |
1da177e4 LT |
148 | int trailer_len = 0; |
149 | ||
150 | dst = dst_prev = NULL; | |
151 | dst_hold(&rt->u.dst); | |
152 | ||
153 | for (i = 0; i < nx; i++) { | |
154 | struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops); | |
155 | struct xfrm_dst *xdst; | |
156 | int tunnel = 0; | |
157 | ||
158 | if (unlikely(dst1 == NULL)) { | |
159 | err = -ENOBUFS; | |
160 | dst_release(&rt->u.dst); | |
161 | goto error; | |
162 | } | |
163 | ||
164 | if (!dst) | |
165 | dst = dst1; | |
166 | else { | |
167 | dst_prev->child = dst1; | |
168 | dst1->flags |= DST_NOHASH; | |
169 | dst_clone(dst1); | |
170 | } | |
171 | ||
172 | xdst = (struct xfrm_dst *)dst1; | |
173 | xdst->route = &rt->u.dst; | |
9d4a706d | 174 | xdst->genid = xfrm[i]->genid; |
92d63dec HY |
175 | if (rt->rt6i_node) |
176 | xdst->route_cookie = rt->rt6i_node->fn_sernum; | |
1da177e4 LT |
177 | |
178 | dst1->next = dst_prev; | |
179 | dst_prev = dst1; | |
7e49e6de | 180 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { |
99505a84 MN |
181 | remote = __xfrm6_bundle_addr_remote(xfrm[i], remote); |
182 | local = __xfrm6_bundle_addr_local(xfrm[i], local); | |
1da177e4 LT |
183 | tunnel = 1; |
184 | } | |
1b5c2299 | 185 | __xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]); |
1da177e4 LT |
186 | trailer_len += xfrm[i]->props.trailer_len; |
187 | ||
188 | if (tunnel) { | |
189 | ipv6_addr_copy(&fl_tunnel.fl6_dst, remote); | |
190 | ipv6_addr_copy(&fl_tunnel.fl6_src, local); | |
191 | err = xfrm_dst_lookup((struct xfrm_dst **) &rt, | |
192 | &fl_tunnel, AF_INET6); | |
193 | if (err) | |
194 | goto error; | |
195 | } else | |
196 | dst_hold(&rt->u.dst); | |
197 | } | |
198 | ||
199 | dst_prev->child = &rt->u.dst; | |
200 | dst->path = &rt->u.dst; | |
92d63dec HY |
201 | if (rt->rt6i_node) |
202 | ((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum; | |
1da177e4 LT |
203 | |
204 | *dst_p = dst; | |
205 | dst = dst_prev; | |
206 | ||
207 | dst_prev = *dst_p; | |
208 | i = 0; | |
209 | for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) { | |
210 | struct xfrm_dst *x = (struct xfrm_dst*)dst_prev; | |
211 | ||
212 | dst_prev->xfrm = xfrm[i++]; | |
213 | dst_prev->dev = rt->u.dst.dev; | |
214 | if (rt->u.dst.dev) | |
215 | dev_hold(rt->u.dst.dev); | |
216 | dst_prev->obsolete = -1; | |
217 | dst_prev->flags |= DST_HOST; | |
218 | dst_prev->lastuse = jiffies; | |
219 | dst_prev->header_len = header_len; | |
1b5c2299 | 220 | dst_prev->nfheader_len = nfheader_len; |
1da177e4 LT |
221 | dst_prev->trailer_len = trailer_len; |
222 | memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics)); | |
223 | ||
224 | /* Copy neighbour for reachability confirmation */ | |
225 | dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour); | |
226 | dst_prev->input = rt->u.dst.input; | |
227 | dst_prev->output = xfrm6_output; | |
228 | /* Sheit... I remember I did this right. Apparently, | |
229 | * it was magically lost, so this code needs audit */ | |
230 | x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL); | |
231 | x->u.rt6.rt6i_metric = rt0->rt6i_metric; | |
232 | x->u.rt6.rt6i_node = rt0->rt6i_node; | |
233 | x->u.rt6.rt6i_gateway = rt0->rt6i_gateway; | |
234 | memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway)); | |
235 | x->u.rt6.rt6i_dst = rt0->rt6i_dst; | |
236 | x->u.rt6.rt6i_src = rt0->rt6i_src; | |
aabc9761 HX |
237 | x->u.rt6.rt6i_idev = rt0->rt6i_idev; |
238 | in6_dev_hold(rt0->rt6i_idev); | |
1b5c2299 | 239 | __xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm); |
1da177e4 LT |
240 | trailer_len -= x->u.dst.xfrm->props.trailer_len; |
241 | } | |
242 | ||
243 | xfrm_init_pmtu(dst); | |
244 | return 0; | |
245 | ||
246 | error: | |
247 | if (dst) | |
248 | dst_free(dst); | |
249 | return err; | |
250 | } | |
251 | ||
252 | static inline void | |
253 | _decode_session6(struct sk_buff *skb, struct flowi *fl) | |
254 | { | |
e5d25a90 | 255 | u16 offset = skb->h.raw - skb->nh.raw; |
1da177e4 | 256 | struct ipv6hdr *hdr = skb->nh.ipv6h; |
e3cae904 | 257 | struct ipv6_opt_hdr *exthdr; |
e5d25a90 | 258 | u8 nexthdr = skb->nh.raw[IP6CB(skb)->nhoff]; |
1da177e4 LT |
259 | |
260 | memset(fl, 0, sizeof(struct flowi)); | |
261 | ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr); | |
262 | ipv6_addr_copy(&fl->fl6_src, &hdr->saddr); | |
263 | ||
264 | while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) { | |
e3cae904 YH |
265 | exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); |
266 | ||
1da177e4 LT |
267 | switch (nexthdr) { |
268 | case NEXTHDR_ROUTING: | |
269 | case NEXTHDR_HOP: | |
270 | case NEXTHDR_DEST: | |
271 | offset += ipv6_optlen(exthdr); | |
272 | nexthdr = exthdr->nexthdr; | |
273 | exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); | |
274 | break; | |
275 | ||
276 | case IPPROTO_UDP: | |
ba4e58ec | 277 | case IPPROTO_UDPLITE: |
1da177e4 LT |
278 | case IPPROTO_TCP: |
279 | case IPPROTO_SCTP: | |
9e999993 | 280 | case IPPROTO_DCCP: |
1da177e4 | 281 | if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) { |
8c689a6e | 282 | __be16 *ports = (__be16 *)exthdr; |
1da177e4 LT |
283 | |
284 | fl->fl_ip_sport = ports[0]; | |
285 | fl->fl_ip_dport = ports[1]; | |
286 | } | |
287 | fl->proto = nexthdr; | |
288 | return; | |
289 | ||
290 | case IPPROTO_ICMPV6: | |
291 | if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) { | |
292 | u8 *icmp = (u8 *)exthdr; | |
293 | ||
294 | fl->fl_icmp_type = icmp[0]; | |
295 | fl->fl_icmp_code = icmp[1]; | |
296 | } | |
297 | fl->proto = nexthdr; | |
298 | return; | |
299 | ||
2ce4272a MN |
300 | #ifdef CONFIG_IPV6_MIP6 |
301 | case IPPROTO_MH: | |
302 | if (pskb_may_pull(skb, skb->nh.raw + offset + 3 - skb->data)) { | |
303 | struct ip6_mh *mh; | |
304 | mh = (struct ip6_mh *)exthdr; | |
305 | ||
306 | fl->fl_mh_type = mh->ip6mh_type; | |
307 | } | |
308 | fl->proto = nexthdr; | |
309 | return; | |
310 | #endif | |
311 | ||
1da177e4 LT |
312 | /* XXX Why are there these headers? */ |
313 | case IPPROTO_AH: | |
314 | case IPPROTO_ESP: | |
315 | case IPPROTO_COMP: | |
316 | default: | |
317 | fl->fl_ipsec_spi = 0; | |
318 | fl->proto = nexthdr; | |
319 | return; | |
320 | }; | |
321 | } | |
322 | } | |
323 | ||
324 | static inline int xfrm6_garbage_collect(void) | |
325 | { | |
1da177e4 | 326 | xfrm6_policy_afinfo.garbage_collect(); |
1da177e4 LT |
327 | return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2); |
328 | } | |
329 | ||
330 | static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu) | |
331 | { | |
332 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
333 | struct dst_entry *path = xdst->route; | |
334 | ||
335 | path->ops->update_pmtu(path, mtu); | |
336 | } | |
337 | ||
aabc9761 HX |
338 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
339 | { | |
340 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
341 | ||
342 | if (likely(xdst->u.rt6.rt6i_idev)) | |
343 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
344 | xfrm_dst_destroy(xdst); | |
345 | } | |
346 | ||
347 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
348 | int unregister) | |
349 | { | |
350 | struct xfrm_dst *xdst; | |
351 | ||
352 | if (!unregister) | |
353 | return; | |
354 | ||
355 | xdst = (struct xfrm_dst *)dst; | |
356 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
357 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); | |
358 | BUG_ON(!loopback_idev); | |
359 | ||
360 | do { | |
361 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
362 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
363 | in6_dev_hold(loopback_idev); | |
364 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
365 | } while (xdst->u.dst.xfrm); | |
366 | ||
367 | __in6_dev_put(loopback_idev); | |
368 | } | |
369 | ||
370 | xfrm_dst_ifdown(dst, dev); | |
371 | } | |
372 | ||
1da177e4 LT |
373 | static struct dst_ops xfrm6_dst_ops = { |
374 | .family = AF_INET6, | |
375 | .protocol = __constant_htons(ETH_P_IPV6), | |
376 | .gc = xfrm6_garbage_collect, | |
377 | .update_pmtu = xfrm6_update_pmtu, | |
aabc9761 HX |
378 | .destroy = xfrm6_dst_destroy, |
379 | .ifdown = xfrm6_dst_ifdown, | |
1da177e4 LT |
380 | .gc_thresh = 1024, |
381 | .entry_size = sizeof(struct xfrm_dst), | |
382 | }; | |
383 | ||
384 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
385 | .family = AF_INET6, | |
1da177e4 LT |
386 | .dst_ops = &xfrm6_dst_ops, |
387 | .dst_lookup = xfrm6_dst_lookup, | |
a1e59abf | 388 | .get_saddr = xfrm6_get_saddr, |
1da177e4 LT |
389 | .find_bundle = __xfrm6_find_bundle, |
390 | .bundle_create = __xfrm6_bundle_create, | |
391 | .decode_session = _decode_session6, | |
392 | }; | |
393 | ||
394 | static void __init xfrm6_policy_init(void) | |
395 | { | |
396 | xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); | |
397 | } | |
398 | ||
399 | static void xfrm6_policy_fini(void) | |
400 | { | |
401 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
402 | } | |
403 | ||
404 | void __init xfrm6_init(void) | |
405 | { | |
406 | xfrm6_policy_init(); | |
407 | xfrm6_state_init(); | |
408 | } | |
409 | ||
410 | void xfrm6_fini(void) | |
411 | { | |
412 | //xfrm6_input_fini(); | |
413 | xfrm6_policy_fini(); | |
414 | xfrm6_state_fini(); | |
415 | } |