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[IPSEC]: Make sure idev is consistent with dev in xfrm_dst
[linux-2.6/verdex.git] / net / ipv6 / xfrm6_policy.c
blob77dc3651437eb5d1761f6856dc7f17c41e412234
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
14 #include <linux/compiler.h>
15 #include <linux/netdevice.h>
16 #include <net/addrconf.h>
17 #include <net/dst.h>
18 #include <net/xfrm.h>
19 #include <net/ip.h>
20 #include <net/ipv6.h>
21 #include <net/ip6_route.h>
22 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
23 #include <net/mip6.h>
24 #endif
25
26 static struct dst_ops xfrm6_dst_ops;
27 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
28
29 static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
30 {
31 struct dst_entry *dst = ip6_route_output(NULL, fl);
32 int err = dst->error;
33 if (!err)
34 *xdst = (struct xfrm_dst *) dst;
35 else
36 dst_release(dst);
37 return err;
38 }
39
40 static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
41 {
42 struct rt6_info *rt;
43 struct flowi fl_tunnel = {
44 .nl_u = {
45 .ip6_u = {
46 .daddr = *(struct in6_addr *)&daddr->a6,
47 },
48 },
49 };
50
51 if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
52 ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
53 (struct in6_addr *)&saddr->a6);
54 dst_release(&rt->u.dst);
55 return 0;
56 }
57 return -EHOSTUNREACH;
58 }
59
60 static struct dst_entry *
61 __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
62 {
63 struct dst_entry *dst;
64
65 /* Still not clear if we should set fl->fl6_{src,dst}... */
66 read_lock_bh(&policy->lock);
67 for (dst = policy->bundles; dst; dst = dst->next) {
68 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
69 struct in6_addr fl_dst_prefix, fl_src_prefix;
70
71 ipv6_addr_prefix(&fl_dst_prefix,
72 &fl->fl6_dst,
73 xdst->u.rt6.rt6i_dst.plen);
74 ipv6_addr_prefix(&fl_src_prefix,
75 &fl->fl6_src,
76 xdst->u.rt6.rt6i_src.plen);
77 if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
78 ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
79 xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
80 (xdst->u.rt6.rt6i_dst.plen != 128 ||
81 xdst->u.rt6.rt6i_src.plen != 128))) {
82 dst_clone(dst);
83 break;
84 }
85 }
86 read_unlock_bh(&policy->lock);
87 return dst;
88 }
89
90 static inline struct in6_addr*
91 __xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
92 {
93 return (x->type->remote_addr) ?
94 (struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
95 (struct in6_addr*)&x->id.daddr;
96 }
97
98 static inline struct in6_addr*
99 __xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
100 {
101 return (x->type->local_addr) ?
102 (struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
103 (struct in6_addr*)&x->props.saddr;
104 }
105
106 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
107 * all the metrics... Shortly, bundle a bundle.
108 */
109
110 static int
111 __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
112 struct flowi *fl, struct dst_entry **dst_p)
113 {
114 struct dst_entry *dst, *dst_prev;
115 struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
116 struct rt6_info *rt = rt0;
117 struct flowi fl_tunnel = {
118 .nl_u = {
119 .ip6_u = {
120 .saddr = fl->fl6_src,
121 .daddr = fl->fl6_dst,
122 }
123 }
124 };
125 int i;
126 int err;
127 int header_len = 0;
128 int trailer_len = 0;
129
130 dst = dst_prev = NULL;
131 dst_hold(&rt->u.dst);
132
133 for (i = 0; i < nx; i++) {
134 struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
135 struct xfrm_dst *xdst;
136
137 if (unlikely(dst1 == NULL)) {
138 err = -ENOBUFS;
139 dst_release(&rt->u.dst);
140 goto error;
141 }
142
143 if (!dst)
144 dst = dst1;
145 else {
146 dst_prev->child = dst1;
147 dst1->flags |= DST_NOHASH;
148 dst_clone(dst1);
149 }
150
151 xdst = (struct xfrm_dst *)dst1;
152 xdst->route = &rt->u.dst;
153 xdst->genid = xfrm[i]->genid;
154 if (rt->rt6i_node)
155 xdst->route_cookie = rt->rt6i_node->fn_sernum;
156
157 dst1->next = dst_prev;
158 dst_prev = dst1;
159
160 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
161 ((struct rt6_info *)dst)->nfheader_len +=
162 xfrm[i]->props.header_len;
163 header_len += xfrm[i]->props.header_len;
164 trailer_len += xfrm[i]->props.trailer_len;
165
166 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
167 unsigned short encap_family = xfrm[i]->props.family;
168 switch(encap_family) {
169 case AF_INET:
170 fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
171 fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
172 break;
173 case AF_INET6:
174 ipv6_addr_copy(&fl_tunnel.fl6_dst, __xfrm6_bundle_addr_remote(xfrm[i], &fl->fl6_dst));
175
176 ipv6_addr_copy(&fl_tunnel.fl6_src, __xfrm6_bundle_addr_local(xfrm[i], &fl->fl6_src));
177 break;
178 default:
179 BUG_ON(1);
180 }
181
182 err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
183 &fl_tunnel, encap_family);
184 if (err)
185 goto error;
186 } else
187 dst_hold(&rt->u.dst);
188 }
189
190 dst_prev->child = &rt->u.dst;
191 dst->path = &rt->u.dst;
192
193 /* Copy neighbour for reachability confirmation */
194 dst->neighbour = neigh_clone(rt->u.dst.neighbour);
195
196 if (rt->rt6i_node)
197 ((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
198
199 *dst_p = dst;
200 dst = dst_prev;
201
202 dst_prev = *dst_p;
203 i = 0;
204 err = -ENODEV;
205 for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
206 struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
207
208 dst_prev->xfrm = xfrm[i++];
209 dst_prev->dev = rt->u.dst.dev;
210 if (!rt->u.dst.dev)
211 goto error;
212 dev_hold(rt->u.dst.dev);
213
214 x->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
215 if (!x->u.rt6.rt6i_idev)
216 goto error;
217
218 dst_prev->obsolete = -1;
219 dst_prev->flags |= DST_HOST;
220 dst_prev->lastuse = jiffies;
221 dst_prev->header_len = header_len;
222 dst_prev->trailer_len = trailer_len;
223 memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
224
225 dst_prev->input = dst_discard;
226 dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
227 /* Sheit... I remember I did this right. Apparently,
228 * it was magically lost, so this code needs audit */
229 x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTF_ANYCAST|RTF_LOCAL);
230 x->u.rt6.rt6i_metric = rt0->rt6i_metric;
231 x->u.rt6.rt6i_node = rt0->rt6i_node;
232 x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
233 memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
234 x->u.rt6.rt6i_dst = rt0->rt6i_dst;
235 x->u.rt6.rt6i_src = rt0->rt6i_src;
236 header_len -= x->u.dst.xfrm->props.header_len;
237 trailer_len -= x->u.dst.xfrm->props.trailer_len;
238 }
239
240 xfrm_init_pmtu(dst);
241 return 0;
242
243 error:
244 if (dst)
245 dst_free(dst);
246 return err;
247 }
248
249 static inline void
250 _decode_session6(struct sk_buff *skb, struct flowi *fl)
251 {
252 u16 offset = skb_network_header_len(skb);
253 struct ipv6hdr *hdr = ipv6_hdr(skb);
254 struct ipv6_opt_hdr *exthdr;
255 const unsigned char *nh = skb_network_header(skb);
256 u8 nexthdr = nh[IP6CB(skb)->nhoff];
257
258 memset(fl, 0, sizeof(struct flowi));
259 ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
260 ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
261
262 while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
263 nh = skb_network_header(skb);
264 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
265
266 switch (nexthdr) {
267 case NEXTHDR_ROUTING:
268 case NEXTHDR_HOP:
269 case NEXTHDR_DEST:
270 offset += ipv6_optlen(exthdr);
271 nexthdr = exthdr->nexthdr;
272 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
273 break;
274
275 case IPPROTO_UDP:
276 case IPPROTO_UDPLITE:
277 case IPPROTO_TCP:
278 case IPPROTO_SCTP:
279 case IPPROTO_DCCP:
280 if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
281 __be16 *ports = (__be16 *)exthdr;
282
283 fl->fl_ip_sport = ports[0];
284 fl->fl_ip_dport = ports[1];
285 }
286 fl->proto = nexthdr;
287 return;
288
289 case IPPROTO_ICMPV6:
290 if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
291 u8 *icmp = (u8 *)exthdr;
292
293 fl->fl_icmp_type = icmp[0];
294 fl->fl_icmp_code = icmp[1];
295 }
296 fl->proto = nexthdr;
297 return;
298
299 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
300 case IPPROTO_MH:
301 if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
302 struct ip6_mh *mh;
303 mh = (struct ip6_mh *)exthdr;
304
305 fl->fl_mh_type = mh->ip6mh_type;
306 }
307 fl->proto = nexthdr;
308 return;
309 #endif
310
311 /* XXX Why are there these headers? */
312 case IPPROTO_AH:
313 case IPPROTO_ESP:
314 case IPPROTO_COMP:
315 default:
316 fl->fl_ipsec_spi = 0;
317 fl->proto = nexthdr;
318 return;
319 }
320 }
321 }
322
323 static inline int xfrm6_garbage_collect(void)
324 {
325 xfrm6_policy_afinfo.garbage_collect();
326 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
327 }
328
329 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
330 {
331 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
332 struct dst_entry *path = xdst->route;
333
334 path->ops->update_pmtu(path, mtu);
335 }
336
337 static void xfrm6_dst_destroy(struct dst_entry *dst)
338 {
339 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
340
341 if (likely(xdst->u.rt6.rt6i_idev))
342 in6_dev_put(xdst->u.rt6.rt6i_idev);
343 xfrm_dst_destroy(xdst);
344 }
345
346 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
347 int unregister)
348 {
349 struct xfrm_dst *xdst;
350
351 if (!unregister)
352 return;
353
354 xdst = (struct xfrm_dst *)dst;
355 if (xdst->u.rt6.rt6i_idev->dev == dev) {
356 struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
357 BUG_ON(!loopback_idev);
358
359 do {
360 in6_dev_put(xdst->u.rt6.rt6i_idev);
361 xdst->u.rt6.rt6i_idev = loopback_idev;
362 in6_dev_hold(loopback_idev);
363 xdst = (struct xfrm_dst *)xdst->u.dst.child;
364 } while (xdst->u.dst.xfrm);
365
366 __in6_dev_put(loopback_idev);
367 }
368
369 xfrm_dst_ifdown(dst, dev);
370 }
371
372 static struct dst_ops xfrm6_dst_ops = {
373 .family = AF_INET6,
374 .protocol = __constant_htons(ETH_P_IPV6),
375 .gc = xfrm6_garbage_collect,
376 .update_pmtu = xfrm6_update_pmtu,
377 .destroy = xfrm6_dst_destroy,
378 .ifdown = xfrm6_dst_ifdown,
379 .gc_thresh = 1024,
380 .entry_size = sizeof(struct xfrm_dst),
381 };
382
383 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
384 .family = AF_INET6,
385 .dst_ops = &xfrm6_dst_ops,
386 .dst_lookup = xfrm6_dst_lookup,
387 .get_saddr = xfrm6_get_saddr,
388 .find_bundle = __xfrm6_find_bundle,
389 .bundle_create = __xfrm6_bundle_create,
390 .decode_session = _decode_session6,
391 };
392
393 static void __init xfrm6_policy_init(void)
394 {
395 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
396 }
397
398 static void xfrm6_policy_fini(void)
399 {
400 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
401 }
402
403 void __init xfrm6_init(void)
404 {
405 xfrm6_policy_init();
406 xfrm6_state_init();
407 }
408
409 void xfrm6_fini(void)
410 {
411 //xfrm6_input_fini();
412 xfrm6_policy_fini();
413 xfrm6_state_fini();
414 }
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