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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * xfrm6_policy.c: based on xfrm4_policy.c | |
4 | * | |
5 | * Authors: | |
6 | * Mitsuru KANDA @USAGI | |
67ba4152 IM |
7 | * Kazunori MIYAZAWA @USAGI |
8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
9 | * IPv6 support | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
1ab1457c | 12 | * |
1da177e4 LT |
13 | */ |
14 | ||
66cdb3ca HX |
15 | #include <linux/err.h> |
16 | #include <linux/kernel.h> | |
aabc9761 HX |
17 | #include <linux/netdevice.h> |
18 | #include <net/addrconf.h> | |
45ff5a3f | 19 | #include <net/dst.h> |
1da177e4 LT |
20 | #include <net/xfrm.h> |
21 | #include <net/ip.h> | |
22 | #include <net/ipv6.h> | |
23 | #include <net/ip6_route.h> | |
385add90 | 24 | #include <net/l3mdev.h> |
07a93626 | 25 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a MN |
26 | #include <net/mip6.h> |
27 | #endif | |
1da177e4 | 28 | |
42a7b32b | 29 | static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif, |
5e6b930f | 30 | const xfrm_address_t *saddr, |
077fbac4 LC |
31 | const xfrm_address_t *daddr, |
32 | u32 mark) | |
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)); |
11d7a0bb | 39 | fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif); |
4148987a | 40 | fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF; |
077fbac4 | 41 | fl6.flowi6_mark = mark; |
7e1dc7b6 | 42 | memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr)); |
66cdb3ca | 43 | if (saddr) |
7e1dc7b6 | 44 | memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr)); |
66cdb3ca | 45 | |
4c9483b2 | 46 | dst = ip6_route_output(net, NULL, &fl6); |
66cdb3ca HX |
47 | |
48 | err = dst->error; | |
49 | if (dst->error) { | |
4251320f | 50 | dst_release(dst); |
66cdb3ca HX |
51 | dst = ERR_PTR(err); |
52 | } | |
53 | ||
54 | return dst; | |
1da177e4 LT |
55 | } |
56 | ||
42a7b32b | 57 | static int xfrm6_get_saddr(struct net *net, int oif, |
077fbac4 LC |
58 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
59 | u32 mark) | |
a1e59abf | 60 | { |
66cdb3ca | 61 | struct dst_entry *dst; |
191cd582 | 62 | struct net_device *dev; |
66cdb3ca | 63 | |
077fbac4 | 64 | dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark); |
66cdb3ca HX |
65 | if (IS_ERR(dst)) |
66 | return -EHOSTUNREACH; | |
67 | ||
191cd582 | 68 | dev = ip6_dst_idev(dst)->dev; |
15e318bd | 69 | ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6); |
66cdb3ca HX |
70 | dst_release(dst); |
71 | return 0; | |
a1e59abf PM |
72 | } |
73 | ||
05d84025 | 74 | static int xfrm6_get_tos(const struct flowi *fl) |
1da177e4 | 75 | { |
25ee3286 HX |
76 | return 0; |
77 | } | |
1da177e4 | 78 | |
a1b05140 MN |
79 | static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
80 | int nfheader_len) | |
81 | { | |
82 | if (dst->ops->family == AF_INET6) { | |
67ba4152 | 83 | struct rt6_info *rt = (struct rt6_info *)dst; |
b197df4f | 84 | path->path_cookie = rt6_get_cookie(rt); |
a1b05140 MN |
85 | } |
86 | ||
87 | path->u.rt6.rt6i_nfheader_len = nfheader_len; | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
87c1e12b | 92 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 93 | const struct flowi *fl) |
25ee3286 | 94 | { |
67ba4152 | 95 | struct rt6_info *rt = (struct rt6_info *)xdst->route; |
1da177e4 | 96 | |
25ee3286 HX |
97 | xdst->u.dst.dev = dev; |
98 | dev_hold(dev); | |
1da177e4 | 99 | |
bc8e4b95 | 100 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
84c4a9df CW |
101 | if (!xdst->u.rt6.rt6i_idev) { |
102 | dev_put(dev); | |
25ee3286 | 103 | return -ENODEV; |
84c4a9df | 104 | } |
1da177e4 | 105 | |
25ee3286 HX |
106 | /* Sheit... I remember I did this right. Apparently, |
107 | * it was magically lost, so this code needs audit */ | |
108 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
109 | RTF_LOCAL); | |
110 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
111 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
b197df4f | 112 | xdst->route_cookie = rt6_get_cookie(rt); |
25ee3286 HX |
113 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; |
114 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
115 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
31a5b09d XL |
116 | INIT_LIST_HEAD(&xdst->u.rt6.rt6i_uncached); |
117 | rt6_uncached_list_add(&xdst->u.rt6); | |
118 | atomic_inc(&dev_net(dev)->ipv6.rt6_stats->fib_rt_uncache); | |
1da177e4 | 119 | |
1da177e4 | 120 | return 0; |
1da177e4 LT |
121 | } |
122 | ||
123 | static inline void | |
d5422efe | 124 | _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) |
1da177e4 | 125 | { |
7e1dc7b6 | 126 | struct flowi6 *fl6 = &fl->u.ip6; |
7e3a42a1 | 127 | int onlyproto = 0; |
b71d1d42 | 128 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
9adb2bc2 | 129 | u32 offset = sizeof(*hdr); |
e3cae904 | 130 | struct ipv6_opt_hdr *exthdr; |
d56f90a7 | 131 | const unsigned char *nh = skb_network_header(skb); |
f8556919 | 132 | u16 nhoff = IP6CB(skb)->nhoff; |
84502b5e | 133 | int oif = 0; |
f8556919 SK |
134 | u8 nexthdr; |
135 | ||
136 | if (!nhoff) | |
137 | nhoff = offsetof(struct ipv6hdr, nexthdr); | |
138 | ||
139 | nexthdr = nh[nhoff]; | |
84502b5e | 140 | |
385add90 | 141 | if (skb_dst(skb)) |
e0d56fdd | 142 | oif = skb_dst(skb)->dev->ifindex; |
1da177e4 | 143 | |
7e1dc7b6 DM |
144 | memset(fl6, 0, sizeof(struct flowi6)); |
145 | fl6->flowi6_mark = skb->mark; | |
84502b5e | 146 | fl6->flowi6_oif = reverse ? skb->skb_iif : oif; |
44b451f1 | 147 | |
4e3fd7a0 AD |
148 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
149 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; | |
1da177e4 | 150 | |
59cae009 WY |
151 | while (nh + offset + 1 < skb->data || |
152 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { | |
d56f90a7 ACM |
153 | nh = skb_network_header(skb); |
154 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 155 | |
1da177e4 | 156 | switch (nexthdr) { |
7e3a42a1 ND |
157 | case NEXTHDR_FRAGMENT: |
158 | onlyproto = 1; | |
275757e6 | 159 | /* fall through */ |
1da177e4 LT |
160 | case NEXTHDR_ROUTING: |
161 | case NEXTHDR_HOP: | |
162 | case NEXTHDR_DEST: | |
163 | offset += ipv6_optlen(exthdr); | |
164 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 165 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
166 | break; |
167 | ||
168 | case IPPROTO_UDP: | |
ba4e58ec | 169 | case IPPROTO_UDPLITE: |
1da177e4 LT |
170 | case IPPROTO_TCP: |
171 | case IPPROTO_SCTP: | |
9e999993 | 172 | case IPPROTO_DCCP: |
59cae009 WY |
173 | if (!onlyproto && (nh + offset + 4 < skb->data || |
174 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { | |
789f2023 | 175 | __be16 *ports; |
1da177e4 | 176 | |
789f2023 LR |
177 | nh = skb_network_header(skb); |
178 | ports = (__be16 *)(nh + offset); | |
1958b856 DM |
179 | fl6->fl6_sport = ports[!!reverse]; |
180 | fl6->fl6_dport = ports[!reverse]; | |
1da177e4 | 181 | } |
7e1dc7b6 | 182 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
183 | return; |
184 | ||
185 | case IPPROTO_ICMPV6: | |
04a6b8bf MK |
186 | if (!onlyproto && (nh + offset + 2 < skb->data || |
187 | pskb_may_pull(skb, nh + offset + 2 - skb->data))) { | |
789f2023 | 188 | u8 *icmp; |
1da177e4 | 189 | |
789f2023 LR |
190 | nh = skb_network_header(skb); |
191 | icmp = (u8 *)(nh + offset); | |
1958b856 DM |
192 | fl6->fl6_icmp_type = icmp[0]; |
193 | fl6->fl6_icmp_code = icmp[1]; | |
1da177e4 | 194 | } |
7e1dc7b6 | 195 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
196 | return; |
197 | ||
07a93626 | 198 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a | 199 | case IPPROTO_MH: |
cd3bafc7 | 200 | offset += ipv6_optlen(exthdr); |
04a6b8bf MK |
201 | if (!onlyproto && (nh + offset + 3 < skb->data || |
202 | pskb_may_pull(skb, nh + offset + 3 - skb->data))) { | |
2ce4272a | 203 | struct ip6_mh *mh; |
2ce4272a | 204 | |
789f2023 LR |
205 | nh = skb_network_header(skb); |
206 | mh = (struct ip6_mh *)(nh + offset); | |
1958b856 | 207 | fl6->fl6_mh_type = mh->ip6mh_type; |
2ce4272a | 208 | } |
7e1dc7b6 | 209 | fl6->flowi6_proto = nexthdr; |
2ce4272a MN |
210 | return; |
211 | #endif | |
212 | ||
1da177e4 LT |
213 | /* XXX Why are there these headers? */ |
214 | case IPPROTO_AH: | |
215 | case IPPROTO_ESP: | |
216 | case IPPROTO_COMP: | |
217 | default: | |
1958b856 | 218 | fl6->fl6_ipsec_spi = 0; |
7e1dc7b6 | 219 | fl6->flowi6_proto = nexthdr; |
1da177e4 | 220 | return; |
3ff50b79 | 221 | } |
1da177e4 LT |
222 | } |
223 | } | |
224 | ||
6700c270 DM |
225 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
226 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
227 | { |
228 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
229 | struct dst_entry *path = xdst->route; | |
230 | ||
6700c270 | 231 | path->ops->update_pmtu(path, sk, skb, mtu); |
1da177e4 LT |
232 | } |
233 | ||
6700c270 DM |
234 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
235 | struct sk_buff *skb) | |
ec18d9a2 DM |
236 | { |
237 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
238 | struct dst_entry *path = xdst->route; | |
239 | ||
6700c270 | 240 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
241 | } |
242 | ||
aabc9761 HX |
243 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
244 | { | |
245 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
246 | ||
247 | if (likely(xdst->u.rt6.rt6i_idev)) | |
248 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 249 | dst_destroy_metrics_generic(dst); |
31a5b09d XL |
250 | if (xdst->u.rt6.rt6i_uncached_list) |
251 | rt6_uncached_list_del(&xdst->u.rt6); | |
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 | 284 | .update_pmtu = xfrm6_update_pmtu, |
ec18d9a2 | 285 | .redirect = xfrm6_redirect, |
62fa8a84 | 286 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 HX |
287 | .destroy = xfrm6_dst_destroy, |
288 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 289 | .local_out = __ip6_local_out, |
3c2a89dd | 290 | .gc_thresh = 32768, |
1da177e4 LT |
291 | }; |
292 | ||
37b10383 | 293 | static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = { |
a8a572a6 | 294 | .dst_ops = &xfrm6_dst_ops_template, |
1da177e4 | 295 | .dst_lookup = xfrm6_dst_lookup, |
67ba4152 | 296 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 297 | .decode_session = _decode_session6, |
25ee3286 | 298 | .get_tos = xfrm6_get_tos, |
a1b05140 | 299 | .init_path = xfrm6_init_path, |
25ee3286 | 300 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 301 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
302 | }; |
303 | ||
0013caba | 304 | static int __init xfrm6_policy_init(void) |
1da177e4 | 305 | { |
a2817d8b | 306 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6); |
1da177e4 LT |
307 | } |
308 | ||
309 | static void xfrm6_policy_fini(void) | |
310 | { | |
311 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
312 | } | |
313 | ||
db71789c | 314 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
315 | static struct ctl_table xfrm6_policy_table[] = { |
316 | { | |
a44a4a00 | 317 | .procname = "xfrm6_gc_thresh", |
67ba4152 IM |
318 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
319 | .maxlen = sizeof(int), | |
320 | .mode = 0644, | |
a44a4a00 NH |
321 | .proc_handler = proc_dointvec, |
322 | }, | |
323 | { } | |
324 | }; | |
325 | ||
a8a572a6 | 326 | static int __net_init xfrm6_net_sysctl_init(struct net *net) |
8d068875 MK |
327 | { |
328 | struct ctl_table *table; | |
329 | struct ctl_table_header *hdr; | |
330 | ||
331 | table = xfrm6_policy_table; | |
332 | if (!net_eq(net, &init_net)) { | |
333 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
334 | if (!table) | |
335 | goto err_alloc; | |
336 | ||
337 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
338 | } | |
339 | ||
340 | hdr = register_net_sysctl(net, "net/ipv6", table); | |
341 | if (!hdr) | |
342 | goto err_reg; | |
343 | ||
344 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
345 | return 0; | |
346 | ||
347 | err_reg: | |
348 | if (!net_eq(net, &init_net)) | |
349 | kfree(table); | |
350 | err_alloc: | |
351 | return -ENOMEM; | |
352 | } | |
353 | ||
a8a572a6 | 354 | static void __net_exit xfrm6_net_sysctl_exit(struct net *net) |
8d068875 MK |
355 | { |
356 | struct ctl_table *table; | |
357 | ||
63159f29 | 358 | if (!net->ipv6.sysctl.xfrm6_hdr) |
8d068875 MK |
359 | return; |
360 | ||
361 | table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg; | |
362 | unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr); | |
363 | if (!net_eq(net, &init_net)) | |
364 | kfree(table); | |
365 | } | |
a8a572a6 | 366 | #else /* CONFIG_SYSCTL */ |
318d3cc0 | 367 | static inline int xfrm6_net_sysctl_init(struct net *net) |
a8a572a6 DS |
368 | { |
369 | return 0; | |
370 | } | |
371 | ||
318d3cc0 | 372 | static inline void xfrm6_net_sysctl_exit(struct net *net) |
a8a572a6 DS |
373 | { |
374 | } | |
375 | #endif | |
376 | ||
377 | static int __net_init xfrm6_net_init(struct net *net) | |
378 | { | |
379 | int ret; | |
380 | ||
381 | memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template, | |
382 | sizeof(xfrm6_dst_ops_template)); | |
383 | ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops); | |
384 | if (ret) | |
385 | return ret; | |
386 | ||
387 | ret = xfrm6_net_sysctl_init(net); | |
388 | if (ret) | |
389 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
390 | ||
391 | return ret; | |
392 | } | |
393 | ||
394 | static void __net_exit xfrm6_net_exit(struct net *net) | |
395 | { | |
396 | xfrm6_net_sysctl_exit(net); | |
397 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
398 | } | |
8d068875 MK |
399 | |
400 | static struct pernet_operations xfrm6_net_ops = { | |
401 | .init = xfrm6_net_init, | |
402 | .exit = xfrm6_net_exit, | |
403 | }; | |
a44a4a00 | 404 | |
0013caba | 405 | int __init xfrm6_init(void) |
1da177e4 | 406 | { |
0013caba | 407 | int ret; |
c3813286 | 408 | |
d7c7544c | 409 | ret = xfrm6_policy_init(); |
a8a572a6 | 410 | if (ret) |
d7c7544c | 411 | goto out; |
d7c7544c AD |
412 | ret = xfrm6_state_init(); |
413 | if (ret) | |
414 | goto out_policy; | |
415 | ||
7e14ea15 SK |
416 | ret = xfrm6_protocol_init(); |
417 | if (ret) | |
418 | goto out_state; | |
419 | ||
8d068875 | 420 | register_pernet_subsys(&xfrm6_net_ops); |
0013caba DL |
421 | out: |
422 | return ret; | |
7e14ea15 SK |
423 | out_state: |
424 | xfrm6_state_fini(); | |
0013caba DL |
425 | out_policy: |
426 | xfrm6_policy_fini(); | |
427 | goto out; | |
1da177e4 LT |
428 | } |
429 | ||
430 | void xfrm6_fini(void) | |
431 | { | |
8d068875 | 432 | unregister_pernet_subsys(&xfrm6_net_ops); |
7e14ea15 | 433 | xfrm6_protocol_fini(); |
1da177e4 LT |
434 | xfrm6_policy_fini(); |
435 | xfrm6_state_fini(); | |
436 | } |