Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm6_policy.c: based on xfrm4_policy.c | |
3 | * | |
4 | * Authors: | |
5 | * Mitsuru KANDA @USAGI | |
67ba4152 IM |
6 | * Kazunori MIYAZAWA @USAGI |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki | |
10 | * Split up af-specific portion | |
1ab1457c | 11 | * |
1da177e4 LT |
12 | */ |
13 | ||
66cdb3ca HX |
14 | #include <linux/err.h> |
15 | #include <linux/kernel.h> | |
aabc9761 HX |
16 | #include <linux/netdevice.h> |
17 | #include <net/addrconf.h> | |
45ff5a3f | 18 | #include <net/dst.h> |
1da177e4 LT |
19 | #include <net/xfrm.h> |
20 | #include <net/ip.h> | |
21 | #include <net/ipv6.h> | |
22 | #include <net/ip6_route.h> | |
385add90 | 23 | #include <net/l3mdev.h> |
07a93626 | 24 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a MN |
25 | #include <net/mip6.h> |
26 | #endif | |
1da177e4 | 27 | |
1da177e4 LT |
28 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo; |
29 | ||
42a7b32b | 30 | static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif, |
5e6b930f DM |
31 | const xfrm_address_t *saddr, |
32 | const xfrm_address_t *daddr) | |
1da177e4 | 33 | { |
7e1dc7b6 | 34 | struct flowi6 fl6; |
66cdb3ca HX |
35 | struct dst_entry *dst; |
36 | int err; | |
37 | ||
7e1dc7b6 | 38 | memset(&fl6, 0, sizeof(fl6)); |
42a7b32b | 39 | fl6.flowi6_oif = oif; |
4148987a | 40 | fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF; |
7e1dc7b6 | 41 | memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr)); |
66cdb3ca | 42 | if (saddr) |
7e1dc7b6 | 43 | memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr)); |
66cdb3ca | 44 | |
4c9483b2 | 45 | dst = ip6_route_output(net, NULL, &fl6); |
66cdb3ca HX |
46 | |
47 | err = dst->error; | |
48 | if (dst->error) { | |
4251320f | 49 | dst_release(dst); |
66cdb3ca HX |
50 | dst = ERR_PTR(err); |
51 | } | |
52 | ||
53 | return dst; | |
1da177e4 LT |
54 | } |
55 | ||
42a7b32b | 56 | static int xfrm6_get_saddr(struct net *net, int oif, |
fbda33b2 | 57 | xfrm_address_t *saddr, xfrm_address_t *daddr) |
a1e59abf | 58 | { |
66cdb3ca | 59 | struct dst_entry *dst; |
191cd582 | 60 | struct net_device *dev; |
66cdb3ca | 61 | |
42a7b32b | 62 | dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr); |
66cdb3ca HX |
63 | if (IS_ERR(dst)) |
64 | return -EHOSTUNREACH; | |
65 | ||
191cd582 | 66 | dev = ip6_dst_idev(dst)->dev; |
15e318bd | 67 | ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6); |
66cdb3ca HX |
68 | dst_release(dst); |
69 | return 0; | |
a1e59abf PM |
70 | } |
71 | ||
05d84025 | 72 | static int xfrm6_get_tos(const struct flowi *fl) |
1da177e4 | 73 | { |
25ee3286 HX |
74 | return 0; |
75 | } | |
1da177e4 | 76 | |
a1b05140 MN |
77 | static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
78 | int nfheader_len) | |
79 | { | |
80 | if (dst->ops->family == AF_INET6) { | |
67ba4152 | 81 | struct rt6_info *rt = (struct rt6_info *)dst; |
b197df4f | 82 | path->path_cookie = rt6_get_cookie(rt); |
a1b05140 MN |
83 | } |
84 | ||
85 | path->u.rt6.rt6i_nfheader_len = nfheader_len; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
87c1e12b | 90 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 91 | const struct flowi *fl) |
25ee3286 | 92 | { |
67ba4152 | 93 | struct rt6_info *rt = (struct rt6_info *)xdst->route; |
1da177e4 | 94 | |
25ee3286 HX |
95 | xdst->u.dst.dev = dev; |
96 | dev_hold(dev); | |
1da177e4 | 97 | |
bc8e4b95 | 98 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
84c4a9df CW |
99 | if (!xdst->u.rt6.rt6i_idev) { |
100 | dev_put(dev); | |
25ee3286 | 101 | return -ENODEV; |
84c4a9df | 102 | } |
1da177e4 | 103 | |
25ee3286 HX |
104 | /* Sheit... I remember I did this right. Apparently, |
105 | * it was magically lost, so this code needs audit */ | |
106 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
107 | RTF_LOCAL); | |
108 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
109 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
b197df4f | 110 | xdst->route_cookie = rt6_get_cookie(rt); |
25ee3286 HX |
111 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; |
112 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
113 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
1da177e4 | 114 | |
1da177e4 | 115 | return 0; |
1da177e4 LT |
116 | } |
117 | ||
118 | static inline void | |
d5422efe | 119 | _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) |
1da177e4 | 120 | { |
7e1dc7b6 | 121 | struct flowi6 *fl6 = &fl->u.ip6; |
7e3a42a1 | 122 | int onlyproto = 0; |
b71d1d42 | 123 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
de3b7a06 | 124 | u16 offset = sizeof(*hdr); |
e3cae904 | 125 | struct ipv6_opt_hdr *exthdr; |
d56f90a7 | 126 | const unsigned char *nh = skb_network_header(skb); |
f8556919 | 127 | u16 nhoff = IP6CB(skb)->nhoff; |
84502b5e | 128 | int oif = 0; |
f8556919 SK |
129 | u8 nexthdr; |
130 | ||
131 | if (!nhoff) | |
132 | nhoff = offsetof(struct ipv6hdr, nexthdr); | |
133 | ||
134 | nexthdr = nh[nhoff]; | |
84502b5e | 135 | |
385add90 DA |
136 | if (skb_dst(skb)) |
137 | oif = l3mdev_fib_oif(skb_dst(skb)->dev); | |
1da177e4 | 138 | |
7e1dc7b6 DM |
139 | memset(fl6, 0, sizeof(struct flowi6)); |
140 | fl6->flowi6_mark = skb->mark; | |
84502b5e | 141 | fl6->flowi6_oif = reverse ? skb->skb_iif : oif; |
44b451f1 | 142 | |
4e3fd7a0 AD |
143 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
144 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; | |
1da177e4 | 145 | |
59cae009 WY |
146 | while (nh + offset + 1 < skb->data || |
147 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { | |
d56f90a7 ACM |
148 | nh = skb_network_header(skb); |
149 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 150 | |
1da177e4 | 151 | switch (nexthdr) { |
7e3a42a1 ND |
152 | case NEXTHDR_FRAGMENT: |
153 | onlyproto = 1; | |
1da177e4 LT |
154 | case NEXTHDR_ROUTING: |
155 | case NEXTHDR_HOP: | |
156 | case NEXTHDR_DEST: | |
157 | offset += ipv6_optlen(exthdr); | |
158 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 159 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
160 | break; |
161 | ||
162 | case IPPROTO_UDP: | |
ba4e58ec | 163 | case IPPROTO_UDPLITE: |
1da177e4 LT |
164 | case IPPROTO_TCP: |
165 | case IPPROTO_SCTP: | |
9e999993 | 166 | case IPPROTO_DCCP: |
59cae009 WY |
167 | if (!onlyproto && (nh + offset + 4 < skb->data || |
168 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { | |
789f2023 | 169 | __be16 *ports; |
1da177e4 | 170 | |
789f2023 LR |
171 | nh = skb_network_header(skb); |
172 | ports = (__be16 *)(nh + offset); | |
1958b856 DM |
173 | fl6->fl6_sport = ports[!!reverse]; |
174 | fl6->fl6_dport = ports[!reverse]; | |
1da177e4 | 175 | } |
7e1dc7b6 | 176 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
177 | return; |
178 | ||
179 | case IPPROTO_ICMPV6: | |
04a6b8bf MK |
180 | if (!onlyproto && (nh + offset + 2 < skb->data || |
181 | pskb_may_pull(skb, nh + offset + 2 - skb->data))) { | |
789f2023 | 182 | u8 *icmp; |
1da177e4 | 183 | |
789f2023 LR |
184 | nh = skb_network_header(skb); |
185 | icmp = (u8 *)(nh + offset); | |
1958b856 DM |
186 | fl6->fl6_icmp_type = icmp[0]; |
187 | fl6->fl6_icmp_code = icmp[1]; | |
1da177e4 | 188 | } |
7e1dc7b6 | 189 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
190 | return; |
191 | ||
07a93626 | 192 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a | 193 | case IPPROTO_MH: |
cd3bafc7 | 194 | offset += ipv6_optlen(exthdr); |
04a6b8bf MK |
195 | if (!onlyproto && (nh + offset + 3 < skb->data || |
196 | pskb_may_pull(skb, nh + offset + 3 - skb->data))) { | |
2ce4272a | 197 | struct ip6_mh *mh; |
2ce4272a | 198 | |
789f2023 LR |
199 | nh = skb_network_header(skb); |
200 | mh = (struct ip6_mh *)(nh + offset); | |
1958b856 | 201 | fl6->fl6_mh_type = mh->ip6mh_type; |
2ce4272a | 202 | } |
7e1dc7b6 | 203 | fl6->flowi6_proto = nexthdr; |
2ce4272a MN |
204 | return; |
205 | #endif | |
206 | ||
1da177e4 LT |
207 | /* XXX Why are there these headers? */ |
208 | case IPPROTO_AH: | |
209 | case IPPROTO_ESP: | |
210 | case IPPROTO_COMP: | |
211 | default: | |
1958b856 | 212 | fl6->fl6_ipsec_spi = 0; |
7e1dc7b6 | 213 | fl6->flowi6_proto = nexthdr; |
1da177e4 | 214 | return; |
3ff50b79 | 215 | } |
1da177e4 LT |
216 | } |
217 | } | |
218 | ||
569d3645 | 219 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
1da177e4 | 220 | { |
d7c7544c AD |
221 | struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops); |
222 | ||
223 | xfrm6_policy_afinfo.garbage_collect(net); | |
fc66f95c | 224 | return dst_entries_get_fast(ops) > ops->gc_thresh * 2; |
1da177e4 LT |
225 | } |
226 | ||
6700c270 DM |
227 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
228 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
229 | { |
230 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
231 | struct dst_entry *path = xdst->route; | |
232 | ||
6700c270 | 233 | path->ops->update_pmtu(path, sk, skb, mtu); |
1da177e4 LT |
234 | } |
235 | ||
6700c270 DM |
236 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
237 | struct sk_buff *skb) | |
ec18d9a2 DM |
238 | { |
239 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
240 | struct dst_entry *path = xdst->route; | |
241 | ||
6700c270 | 242 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
243 | } |
244 | ||
aabc9761 HX |
245 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
246 | { | |
247 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
248 | ||
249 | if (likely(xdst->u.rt6.rt6i_idev)) | |
250 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 251 | dst_destroy_metrics_generic(dst); |
aabc9761 HX |
252 | xfrm_dst_destroy(xdst); |
253 | } | |
254 | ||
255 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
256 | int unregister) | |
257 | { | |
258 | struct xfrm_dst *xdst; | |
259 | ||
260 | if (!unregister) | |
261 | return; | |
262 | ||
263 | xdst = (struct xfrm_dst *)dst; | |
264 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 265 | struct inet6_dev *loopback_idev = |
c346dca1 | 266 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
267 | BUG_ON(!loopback_idev); |
268 | ||
269 | do { | |
270 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
271 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
272 | in6_dev_hold(loopback_idev); | |
273 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
274 | } while (xdst->u.dst.xfrm); | |
275 | ||
276 | __in6_dev_put(loopback_idev); | |
277 | } | |
278 | ||
279 | xfrm_dst_ifdown(dst, dev); | |
280 | } | |
281 | ||
a8a572a6 | 282 | static struct dst_ops xfrm6_dst_ops_template = { |
1da177e4 | 283 | .family = AF_INET6, |
1da177e4 LT |
284 | .gc = xfrm6_garbage_collect, |
285 | .update_pmtu = xfrm6_update_pmtu, | |
ec18d9a2 | 286 | .redirect = xfrm6_redirect, |
62fa8a84 | 287 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 HX |
288 | .destroy = xfrm6_dst_destroy, |
289 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 290 | .local_out = __ip6_local_out, |
c386578f | 291 | .gc_thresh = INT_MAX, |
1da177e4 LT |
292 | }; |
293 | ||
294 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
295 | .family = AF_INET6, | |
a8a572a6 | 296 | .dst_ops = &xfrm6_dst_ops_template, |
1da177e4 | 297 | .dst_lookup = xfrm6_dst_lookup, |
67ba4152 | 298 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 299 | .decode_session = _decode_session6, |
25ee3286 | 300 | .get_tos = xfrm6_get_tos, |
a1b05140 | 301 | .init_path = xfrm6_init_path, |
25ee3286 | 302 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 303 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
304 | }; |
305 | ||
0013caba | 306 | static int __init xfrm6_policy_init(void) |
1da177e4 | 307 | { |
0013caba | 308 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
1da177e4 LT |
309 | } |
310 | ||
311 | static void xfrm6_policy_fini(void) | |
312 | { | |
313 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
314 | } | |
315 | ||
db71789c | 316 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
317 | static struct ctl_table xfrm6_policy_table[] = { |
318 | { | |
a44a4a00 | 319 | .procname = "xfrm6_gc_thresh", |
67ba4152 IM |
320 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
321 | .maxlen = sizeof(int), | |
322 | .mode = 0644, | |
a44a4a00 NH |
323 | .proc_handler = proc_dointvec, |
324 | }, | |
325 | { } | |
326 | }; | |
327 | ||
a8a572a6 | 328 | static int __net_init xfrm6_net_sysctl_init(struct net *net) |
8d068875 MK |
329 | { |
330 | struct ctl_table *table; | |
331 | struct ctl_table_header *hdr; | |
332 | ||
333 | table = xfrm6_policy_table; | |
334 | if (!net_eq(net, &init_net)) { | |
335 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
336 | if (!table) | |
337 | goto err_alloc; | |
338 | ||
339 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
340 | } | |
341 | ||
342 | hdr = register_net_sysctl(net, "net/ipv6", table); | |
343 | if (!hdr) | |
344 | goto err_reg; | |
345 | ||
346 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
347 | return 0; | |
348 | ||
349 | err_reg: | |
350 | if (!net_eq(net, &init_net)) | |
351 | kfree(table); | |
352 | err_alloc: | |
353 | return -ENOMEM; | |
354 | } | |
355 | ||
a8a572a6 | 356 | static void __net_exit xfrm6_net_sysctl_exit(struct net *net) |
8d068875 MK |
357 | { |
358 | struct ctl_table *table; | |
359 | ||
63159f29 | 360 | if (!net->ipv6.sysctl.xfrm6_hdr) |
8d068875 MK |
361 | return; |
362 | ||
363 | table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg; | |
364 | unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr); | |
365 | if (!net_eq(net, &init_net)) | |
366 | kfree(table); | |
367 | } | |
a8a572a6 DS |
368 | #else /* CONFIG_SYSCTL */ |
369 | static int inline xfrm6_net_sysctl_init(struct net *net) | |
370 | { | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static void inline xfrm6_net_sysctl_exit(struct net *net) | |
375 | { | |
376 | } | |
377 | #endif | |
378 | ||
379 | static int __net_init xfrm6_net_init(struct net *net) | |
380 | { | |
381 | int ret; | |
382 | ||
383 | memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template, | |
384 | sizeof(xfrm6_dst_ops_template)); | |
385 | ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops); | |
386 | if (ret) | |
387 | return ret; | |
388 | ||
389 | ret = xfrm6_net_sysctl_init(net); | |
390 | if (ret) | |
391 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
392 | ||
393 | return ret; | |
394 | } | |
395 | ||
396 | static void __net_exit xfrm6_net_exit(struct net *net) | |
397 | { | |
398 | xfrm6_net_sysctl_exit(net); | |
399 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
400 | } | |
8d068875 MK |
401 | |
402 | static struct pernet_operations xfrm6_net_ops = { | |
403 | .init = xfrm6_net_init, | |
404 | .exit = xfrm6_net_exit, | |
405 | }; | |
a44a4a00 | 406 | |
0013caba | 407 | int __init xfrm6_init(void) |
1da177e4 | 408 | { |
0013caba | 409 | int ret; |
c3813286 | 410 | |
d7c7544c | 411 | ret = xfrm6_policy_init(); |
a8a572a6 | 412 | if (ret) |
d7c7544c | 413 | goto out; |
d7c7544c AD |
414 | ret = xfrm6_state_init(); |
415 | if (ret) | |
416 | goto out_policy; | |
417 | ||
7e14ea15 SK |
418 | ret = xfrm6_protocol_init(); |
419 | if (ret) | |
420 | goto out_state; | |
421 | ||
8d068875 | 422 | register_pernet_subsys(&xfrm6_net_ops); |
0013caba DL |
423 | out: |
424 | return ret; | |
7e14ea15 SK |
425 | out_state: |
426 | xfrm6_state_fini(); | |
0013caba DL |
427 | out_policy: |
428 | xfrm6_policy_fini(); | |
429 | goto out; | |
1da177e4 LT |
430 | } |
431 | ||
432 | void xfrm6_fini(void) | |
433 | { | |
8d068875 | 434 | unregister_pernet_subsys(&xfrm6_net_ops); |
7e14ea15 | 435 | xfrm6_protocol_fini(); |
1da177e4 LT |
436 | xfrm6_policy_fini(); |
437 | xfrm6_state_fini(); | |
438 | } |