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> | |
4ec3b28c | 23 | #include <net/vrf.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; |
7e1dc7b6 | 40 | memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr)); |
66cdb3ca | 41 | if (saddr) |
7e1dc7b6 | 42 | memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr)); |
66cdb3ca | 43 | |
4c9483b2 | 44 | dst = ip6_route_output(net, NULL, &fl6); |
66cdb3ca HX |
45 | |
46 | err = dst->error; | |
47 | if (dst->error) { | |
4251320f | 48 | dst_release(dst); |
66cdb3ca HX |
49 | dst = ERR_PTR(err); |
50 | } | |
51 | ||
52 | return dst; | |
1da177e4 LT |
53 | } |
54 | ||
42a7b32b | 55 | static int xfrm6_get_saddr(struct net *net, int oif, |
fbda33b2 | 56 | xfrm_address_t *saddr, xfrm_address_t *daddr) |
a1e59abf | 57 | { |
66cdb3ca | 58 | struct dst_entry *dst; |
191cd582 | 59 | struct net_device *dev; |
66cdb3ca | 60 | |
42a7b32b | 61 | dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr); |
66cdb3ca HX |
62 | if (IS_ERR(dst)) |
63 | return -EHOSTUNREACH; | |
64 | ||
191cd582 | 65 | dev = ip6_dst_idev(dst)->dev; |
15e318bd | 66 | ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6); |
66cdb3ca HX |
67 | dst_release(dst); |
68 | return 0; | |
a1e59abf PM |
69 | } |
70 | ||
05d84025 | 71 | static int xfrm6_get_tos(const struct flowi *fl) |
1da177e4 | 72 | { |
25ee3286 HX |
73 | return 0; |
74 | } | |
1da177e4 | 75 | |
a1b05140 MN |
76 | static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
77 | int nfheader_len) | |
78 | { | |
79 | if (dst->ops->family == AF_INET6) { | |
67ba4152 | 80 | struct rt6_info *rt = (struct rt6_info *)dst; |
b197df4f | 81 | path->path_cookie = rt6_get_cookie(rt); |
a1b05140 MN |
82 | } |
83 | ||
84 | path->u.rt6.rt6i_nfheader_len = nfheader_len; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
87c1e12b | 89 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 90 | const struct flowi *fl) |
25ee3286 | 91 | { |
67ba4152 | 92 | struct rt6_info *rt = (struct rt6_info *)xdst->route; |
1da177e4 | 93 | |
25ee3286 HX |
94 | xdst->u.dst.dev = dev; |
95 | dev_hold(dev); | |
1da177e4 | 96 | |
bc8e4b95 | 97 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
84c4a9df CW |
98 | if (!xdst->u.rt6.rt6i_idev) { |
99 | dev_put(dev); | |
25ee3286 | 100 | return -ENODEV; |
84c4a9df | 101 | } |
1da177e4 | 102 | |
25ee3286 HX |
103 | /* Sheit... I remember I did this right. Apparently, |
104 | * it was magically lost, so this code needs audit */ | |
105 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
106 | RTF_LOCAL); | |
107 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
108 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
b197df4f | 109 | xdst->route_cookie = rt6_get_cookie(rt); |
25ee3286 HX |
110 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; |
111 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
112 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
1da177e4 | 113 | |
1da177e4 | 114 | return 0; |
1da177e4 LT |
115 | } |
116 | ||
117 | static inline void | |
d5422efe | 118 | _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) |
1da177e4 | 119 | { |
7e1dc7b6 | 120 | struct flowi6 *fl6 = &fl->u.ip6; |
7e3a42a1 | 121 | int onlyproto = 0; |
b71d1d42 | 122 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
de3b7a06 | 123 | u16 offset = sizeof(*hdr); |
e3cae904 | 124 | struct ipv6_opt_hdr *exthdr; |
d56f90a7 | 125 | const unsigned char *nh = skb_network_header(skb); |
f8556919 | 126 | u16 nhoff = IP6CB(skb)->nhoff; |
84502b5e | 127 | int oif = 0; |
f8556919 SK |
128 | u8 nexthdr; |
129 | ||
130 | if (!nhoff) | |
131 | nhoff = offsetof(struct ipv6hdr, nexthdr); | |
132 | ||
133 | nexthdr = nh[nhoff]; | |
84502b5e | 134 | |
4ec3b28c DA |
135 | if (skb_dst(skb)) { |
136 | oif = vrf_master_ifindex(skb_dst(skb)->dev) ? | |
137 | : skb_dst(skb)->dev->ifindex; | |
138 | } | |
1da177e4 | 139 | |
7e1dc7b6 DM |
140 | memset(fl6, 0, sizeof(struct flowi6)); |
141 | fl6->flowi6_mark = skb->mark; | |
84502b5e | 142 | fl6->flowi6_oif = reverse ? skb->skb_iif : oif; |
44b451f1 | 143 | |
4e3fd7a0 AD |
144 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
145 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; | |
1da177e4 | 146 | |
59cae009 WY |
147 | while (nh + offset + 1 < skb->data || |
148 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { | |
d56f90a7 ACM |
149 | nh = skb_network_header(skb); |
150 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 151 | |
1da177e4 | 152 | switch (nexthdr) { |
7e3a42a1 ND |
153 | case NEXTHDR_FRAGMENT: |
154 | onlyproto = 1; | |
1da177e4 LT |
155 | case NEXTHDR_ROUTING: |
156 | case NEXTHDR_HOP: | |
157 | case NEXTHDR_DEST: | |
158 | offset += ipv6_optlen(exthdr); | |
159 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 160 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
161 | break; |
162 | ||
163 | case IPPROTO_UDP: | |
ba4e58ec | 164 | case IPPROTO_UDPLITE: |
1da177e4 LT |
165 | case IPPROTO_TCP: |
166 | case IPPROTO_SCTP: | |
9e999993 | 167 | case IPPROTO_DCCP: |
59cae009 WY |
168 | if (!onlyproto && (nh + offset + 4 < skb->data || |
169 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { | |
789f2023 | 170 | __be16 *ports; |
1da177e4 | 171 | |
789f2023 LR |
172 | nh = skb_network_header(skb); |
173 | ports = (__be16 *)(nh + offset); | |
1958b856 DM |
174 | fl6->fl6_sport = ports[!!reverse]; |
175 | fl6->fl6_dport = ports[!reverse]; | |
1da177e4 | 176 | } |
7e1dc7b6 | 177 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
178 | return; |
179 | ||
180 | case IPPROTO_ICMPV6: | |
7e3a42a1 | 181 | if (!onlyproto && 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); |
7e3a42a1 | 195 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
2ce4272a | 196 | struct ip6_mh *mh; |
2ce4272a | 197 | |
789f2023 LR |
198 | nh = skb_network_header(skb); |
199 | mh = (struct ip6_mh *)(nh + offset); | |
1958b856 | 200 | fl6->fl6_mh_type = mh->ip6mh_type; |
2ce4272a | 201 | } |
7e1dc7b6 | 202 | fl6->flowi6_proto = nexthdr; |
2ce4272a MN |
203 | return; |
204 | #endif | |
205 | ||
1da177e4 LT |
206 | /* XXX Why are there these headers? */ |
207 | case IPPROTO_AH: | |
208 | case IPPROTO_ESP: | |
209 | case IPPROTO_COMP: | |
210 | default: | |
1958b856 | 211 | fl6->fl6_ipsec_spi = 0; |
7e1dc7b6 | 212 | fl6->flowi6_proto = nexthdr; |
1da177e4 | 213 | return; |
3ff50b79 | 214 | } |
1da177e4 LT |
215 | } |
216 | } | |
217 | ||
569d3645 | 218 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
1da177e4 | 219 | { |
d7c7544c AD |
220 | struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops); |
221 | ||
222 | xfrm6_policy_afinfo.garbage_collect(net); | |
fc66f95c | 223 | return dst_entries_get_fast(ops) > ops->gc_thresh * 2; |
1da177e4 LT |
224 | } |
225 | ||
6700c270 DM |
226 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
227 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
228 | { |
229 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
230 | struct dst_entry *path = xdst->route; | |
231 | ||
6700c270 | 232 | path->ops->update_pmtu(path, sk, skb, mtu); |
1da177e4 LT |
233 | } |
234 | ||
6700c270 DM |
235 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
236 | struct sk_buff *skb) | |
ec18d9a2 DM |
237 | { |
238 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
239 | struct dst_entry *path = xdst->route; | |
240 | ||
6700c270 | 241 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
242 | } |
243 | ||
aabc9761 HX |
244 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
245 | { | |
246 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
247 | ||
248 | if (likely(xdst->u.rt6.rt6i_idev)) | |
249 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 250 | dst_destroy_metrics_generic(dst); |
aabc9761 HX |
251 | xfrm_dst_destroy(xdst); |
252 | } | |
253 | ||
254 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
255 | int unregister) | |
256 | { | |
257 | struct xfrm_dst *xdst; | |
258 | ||
259 | if (!unregister) | |
260 | return; | |
261 | ||
262 | xdst = (struct xfrm_dst *)dst; | |
263 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 264 | struct inet6_dev *loopback_idev = |
c346dca1 | 265 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
266 | BUG_ON(!loopback_idev); |
267 | ||
268 | do { | |
269 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
270 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
271 | in6_dev_hold(loopback_idev); | |
272 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
273 | } while (xdst->u.dst.xfrm); | |
274 | ||
275 | __in6_dev_put(loopback_idev); | |
276 | } | |
277 | ||
278 | xfrm_dst_ifdown(dst, dev); | |
279 | } | |
280 | ||
1da177e4 LT |
281 | static struct dst_ops xfrm6_dst_ops = { |
282 | .family = AF_INET6, | |
1da177e4 LT |
283 | .gc = xfrm6_garbage_collect, |
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, |
eeb1b733 | 290 | .gc_thresh = 32768, |
1da177e4 LT |
291 | }; |
292 | ||
293 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
294 | .family = AF_INET6, | |
1da177e4 LT |
295 | .dst_ops = &xfrm6_dst_ops, |
296 | .dst_lookup = xfrm6_dst_lookup, | |
67ba4152 | 297 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 298 | .decode_session = _decode_session6, |
25ee3286 | 299 | .get_tos = xfrm6_get_tos, |
a1b05140 | 300 | .init_path = xfrm6_init_path, |
25ee3286 | 301 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 302 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
303 | }; |
304 | ||
0013caba | 305 | static int __init xfrm6_policy_init(void) |
1da177e4 | 306 | { |
0013caba | 307 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
1da177e4 LT |
308 | } |
309 | ||
310 | static void xfrm6_policy_fini(void) | |
311 | { | |
312 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
313 | } | |
314 | ||
db71789c | 315 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
316 | static struct ctl_table xfrm6_policy_table[] = { |
317 | { | |
a44a4a00 | 318 | .procname = "xfrm6_gc_thresh", |
67ba4152 IM |
319 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
320 | .maxlen = sizeof(int), | |
321 | .mode = 0644, | |
a44a4a00 NH |
322 | .proc_handler = proc_dointvec, |
323 | }, | |
324 | { } | |
325 | }; | |
326 | ||
8d068875 MK |
327 | static int __net_init xfrm6_net_init(struct net *net) |
328 | { | |
329 | struct ctl_table *table; | |
330 | struct ctl_table_header *hdr; | |
331 | ||
332 | table = xfrm6_policy_table; | |
333 | if (!net_eq(net, &init_net)) { | |
334 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
335 | if (!table) | |
336 | goto err_alloc; | |
337 | ||
338 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
339 | } | |
340 | ||
341 | hdr = register_net_sysctl(net, "net/ipv6", table); | |
342 | if (!hdr) | |
343 | goto err_reg; | |
344 | ||
345 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
346 | return 0; | |
347 | ||
348 | err_reg: | |
349 | if (!net_eq(net, &init_net)) | |
350 | kfree(table); | |
351 | err_alloc: | |
352 | return -ENOMEM; | |
353 | } | |
354 | ||
355 | static void __net_exit xfrm6_net_exit(struct net *net) | |
356 | { | |
357 | struct ctl_table *table; | |
358 | ||
63159f29 | 359 | if (!net->ipv6.sysctl.xfrm6_hdr) |
8d068875 MK |
360 | return; |
361 | ||
362 | table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg; | |
363 | unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr); | |
364 | if (!net_eq(net, &init_net)) | |
365 | kfree(table); | |
366 | } | |
367 | ||
368 | static struct pernet_operations xfrm6_net_ops = { | |
369 | .init = xfrm6_net_init, | |
370 | .exit = xfrm6_net_exit, | |
371 | }; | |
db71789c | 372 | #endif |
a44a4a00 | 373 | |
0013caba | 374 | int __init xfrm6_init(void) |
1da177e4 | 375 | { |
0013caba | 376 | int ret; |
c3813286 | 377 | |
fc66f95c | 378 | dst_entries_init(&xfrm6_dst_ops); |
d7c7544c AD |
379 | |
380 | ret = xfrm6_policy_init(); | |
fc66f95c ED |
381 | if (ret) { |
382 | dst_entries_destroy(&xfrm6_dst_ops); | |
d7c7544c | 383 | goto out; |
fc66f95c | 384 | } |
d7c7544c AD |
385 | ret = xfrm6_state_init(); |
386 | if (ret) | |
387 | goto out_policy; | |
388 | ||
7e14ea15 SK |
389 | ret = xfrm6_protocol_init(); |
390 | if (ret) | |
391 | goto out_state; | |
392 | ||
db71789c | 393 | #ifdef CONFIG_SYSCTL |
8d068875 | 394 | register_pernet_subsys(&xfrm6_net_ops); |
db71789c | 395 | #endif |
0013caba DL |
396 | out: |
397 | return ret; | |
7e14ea15 SK |
398 | out_state: |
399 | xfrm6_state_fini(); | |
0013caba DL |
400 | out_policy: |
401 | xfrm6_policy_fini(); | |
402 | goto out; | |
1da177e4 LT |
403 | } |
404 | ||
405 | void xfrm6_fini(void) | |
406 | { | |
db71789c | 407 | #ifdef CONFIG_SYSCTL |
8d068875 | 408 | unregister_pernet_subsys(&xfrm6_net_ops); |
db71789c | 409 | #endif |
7e14ea15 | 410 | xfrm6_protocol_fini(); |
1da177e4 LT |
411 | xfrm6_policy_fini(); |
412 | xfrm6_state_fini(); | |
fc66f95c | 413 | dst_entries_destroy(&xfrm6_dst_ops); |
1da177e4 | 414 | } |