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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 | |
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> | |
07a93626 | 23 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a MN |
24 | #include <net/mip6.h> |
25 | #endif | |
1da177e4 | 26 | |
1da177e4 LT |
27 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo; |
28 | ||
c5b3cf46 | 29 | static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, |
5e6b930f DM |
30 | const xfrm_address_t *saddr, |
31 | const xfrm_address_t *daddr) | |
1da177e4 | 32 | { |
7e1dc7b6 | 33 | struct flowi6 fl6; |
66cdb3ca HX |
34 | struct dst_entry *dst; |
35 | int err; | |
36 | ||
7e1dc7b6 DM |
37 | memset(&fl6, 0, sizeof(fl6)); |
38 | memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr)); | |
66cdb3ca | 39 | if (saddr) |
7e1dc7b6 | 40 | memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr)); |
66cdb3ca | 41 | |
4c9483b2 | 42 | dst = ip6_route_output(net, NULL, &fl6); |
66cdb3ca HX |
43 | |
44 | err = dst->error; | |
45 | if (dst->error) { | |
4251320f | 46 | dst_release(dst); |
66cdb3ca HX |
47 | dst = ERR_PTR(err); |
48 | } | |
49 | ||
50 | return dst; | |
1da177e4 LT |
51 | } |
52 | ||
fbda33b2 AD |
53 | static int xfrm6_get_saddr(struct net *net, |
54 | xfrm_address_t *saddr, xfrm_address_t *daddr) | |
a1e59abf | 55 | { |
66cdb3ca | 56 | struct dst_entry *dst; |
191cd582 | 57 | struct net_device *dev; |
66cdb3ca | 58 | |
fbda33b2 | 59 | dst = xfrm6_dst_lookup(net, 0, NULL, daddr); |
66cdb3ca HX |
60 | if (IS_ERR(dst)) |
61 | return -EHOSTUNREACH; | |
62 | ||
191cd582 | 63 | dev = ip6_dst_idev(dst)->dev; |
15e318bd | 64 | ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6); |
66cdb3ca HX |
65 | dst_release(dst); |
66 | return 0; | |
a1e59abf PM |
67 | } |
68 | ||
05d84025 | 69 | static int xfrm6_get_tos(const struct flowi *fl) |
1da177e4 | 70 | { |
25ee3286 HX |
71 | return 0; |
72 | } | |
1da177e4 | 73 | |
a1b05140 MN |
74 | static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
75 | int nfheader_len) | |
76 | { | |
77 | if (dst->ops->family == AF_INET6) { | |
67ba4152 | 78 | struct rt6_info *rt = (struct rt6_info *)dst; |
a1b05140 MN |
79 | if (rt->rt6i_node) |
80 | path->path_cookie = rt->rt6i_node->fn_sernum; | |
81 | } | |
82 | ||
83 | path->u.rt6.rt6i_nfheader_len = nfheader_len; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
87c1e12b | 88 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 89 | const struct flowi *fl) |
25ee3286 | 90 | { |
67ba4152 | 91 | struct rt6_info *rt = (struct rt6_info *)xdst->route; |
1da177e4 | 92 | |
25ee3286 HX |
93 | xdst->u.dst.dev = dev; |
94 | dev_hold(dev); | |
1da177e4 | 95 | |
bc8e4b95 | 96 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
84c4a9df CW |
97 | if (!xdst->u.rt6.rt6i_idev) { |
98 | dev_put(dev); | |
25ee3286 | 99 | return -ENODEV; |
84c4a9df | 100 | } |
1da177e4 | 101 | |
25ee3286 HX |
102 | /* Sheit... I remember I did this right. Apparently, |
103 | * it was magically lost, so this code needs audit */ | |
104 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
105 | RTF_LOCAL); | |
106 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
107 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
a1b05140 MN |
108 | if (rt->rt6i_node) |
109 | xdst->route_cookie = rt->rt6i_node->fn_sernum; | |
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 SK |
134 | |
135 | if (skb_dst(skb)) | |
136 | oif = skb_dst(skb)->dev->ifindex; | |
1da177e4 | 137 | |
7e1dc7b6 DM |
138 | memset(fl6, 0, sizeof(struct flowi6)); |
139 | fl6->flowi6_mark = skb->mark; | |
84502b5e | 140 | fl6->flowi6_oif = reverse ? skb->skb_iif : oif; |
44b451f1 | 141 | |
4e3fd7a0 AD |
142 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
143 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; | |
1da177e4 | 144 | |
59cae009 WY |
145 | while (nh + offset + 1 < skb->data || |
146 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { | |
d56f90a7 ACM |
147 | nh = skb_network_header(skb); |
148 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 149 | |
1da177e4 | 150 | switch (nexthdr) { |
7e3a42a1 ND |
151 | case NEXTHDR_FRAGMENT: |
152 | onlyproto = 1; | |
1da177e4 LT |
153 | case NEXTHDR_ROUTING: |
154 | case NEXTHDR_HOP: | |
155 | case NEXTHDR_DEST: | |
156 | offset += ipv6_optlen(exthdr); | |
157 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 158 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
159 | break; |
160 | ||
161 | case IPPROTO_UDP: | |
ba4e58ec | 162 | case IPPROTO_UDPLITE: |
1da177e4 LT |
163 | case IPPROTO_TCP: |
164 | case IPPROTO_SCTP: | |
9e999993 | 165 | case IPPROTO_DCCP: |
59cae009 WY |
166 | if (!onlyproto && (nh + offset + 4 < skb->data || |
167 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { | |
789f2023 | 168 | __be16 *ports; |
1da177e4 | 169 | |
789f2023 LR |
170 | nh = skb_network_header(skb); |
171 | ports = (__be16 *)(nh + offset); | |
1958b856 DM |
172 | fl6->fl6_sport = ports[!!reverse]; |
173 | fl6->fl6_dport = ports[!reverse]; | |
1da177e4 | 174 | } |
7e1dc7b6 | 175 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
176 | return; |
177 | ||
178 | case IPPROTO_ICMPV6: | |
7e3a42a1 | 179 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) { |
789f2023 | 180 | u8 *icmp; |
1da177e4 | 181 | |
789f2023 LR |
182 | nh = skb_network_header(skb); |
183 | icmp = (u8 *)(nh + offset); | |
1958b856 DM |
184 | fl6->fl6_icmp_type = icmp[0]; |
185 | fl6->fl6_icmp_code = icmp[1]; | |
1da177e4 | 186 | } |
7e1dc7b6 | 187 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
188 | return; |
189 | ||
07a93626 | 190 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a | 191 | case IPPROTO_MH: |
cd3bafc7 | 192 | offset += ipv6_optlen(exthdr); |
7e3a42a1 | 193 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
2ce4272a | 194 | struct ip6_mh *mh; |
2ce4272a | 195 | |
789f2023 LR |
196 | nh = skb_network_header(skb); |
197 | mh = (struct ip6_mh *)(nh + offset); | |
1958b856 | 198 | fl6->fl6_mh_type = mh->ip6mh_type; |
2ce4272a | 199 | } |
7e1dc7b6 | 200 | fl6->flowi6_proto = nexthdr; |
2ce4272a MN |
201 | return; |
202 | #endif | |
203 | ||
1da177e4 LT |
204 | /* XXX Why are there these headers? */ |
205 | case IPPROTO_AH: | |
206 | case IPPROTO_ESP: | |
207 | case IPPROTO_COMP: | |
208 | default: | |
1958b856 | 209 | fl6->fl6_ipsec_spi = 0; |
7e1dc7b6 | 210 | fl6->flowi6_proto = nexthdr; |
1da177e4 | 211 | return; |
3ff50b79 | 212 | } |
1da177e4 LT |
213 | } |
214 | } | |
215 | ||
569d3645 | 216 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
1da177e4 | 217 | { |
d7c7544c AD |
218 | struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops); |
219 | ||
220 | xfrm6_policy_afinfo.garbage_collect(net); | |
fc66f95c | 221 | return dst_entries_get_fast(ops) > ops->gc_thresh * 2; |
1da177e4 LT |
222 | } |
223 | ||
6700c270 DM |
224 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
225 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
226 | { |
227 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
228 | struct dst_entry *path = xdst->route; | |
229 | ||
6700c270 | 230 | path->ops->update_pmtu(path, sk, skb, mtu); |
1da177e4 LT |
231 | } |
232 | ||
6700c270 DM |
233 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
234 | struct sk_buff *skb) | |
ec18d9a2 DM |
235 | { |
236 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
237 | struct dst_entry *path = xdst->route; | |
238 | ||
6700c270 | 239 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
240 | } |
241 | ||
aabc9761 HX |
242 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
243 | { | |
244 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
245 | ||
246 | if (likely(xdst->u.rt6.rt6i_idev)) | |
247 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 248 | dst_destroy_metrics_generic(dst); |
aabc9761 HX |
249 | xfrm_dst_destroy(xdst); |
250 | } | |
251 | ||
252 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
253 | int unregister) | |
254 | { | |
255 | struct xfrm_dst *xdst; | |
256 | ||
257 | if (!unregister) | |
258 | return; | |
259 | ||
260 | xdst = (struct xfrm_dst *)dst; | |
261 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 262 | struct inet6_dev *loopback_idev = |
c346dca1 | 263 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
264 | BUG_ON(!loopback_idev); |
265 | ||
266 | do { | |
267 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
268 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
269 | in6_dev_hold(loopback_idev); | |
270 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
271 | } while (xdst->u.dst.xfrm); | |
272 | ||
273 | __in6_dev_put(loopback_idev); | |
274 | } | |
275 | ||
276 | xfrm_dst_ifdown(dst, dev); | |
277 | } | |
278 | ||
1da177e4 LT |
279 | static struct dst_ops xfrm6_dst_ops = { |
280 | .family = AF_INET6, | |
1da177e4 LT |
281 | .gc = xfrm6_garbage_collect, |
282 | .update_pmtu = xfrm6_update_pmtu, | |
ec18d9a2 | 283 | .redirect = xfrm6_redirect, |
62fa8a84 | 284 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 HX |
285 | .destroy = xfrm6_dst_destroy, |
286 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 287 | .local_out = __ip6_local_out, |
eeb1b733 | 288 | .gc_thresh = 32768, |
1da177e4 LT |
289 | }; |
290 | ||
291 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
292 | .family = AF_INET6, | |
1da177e4 LT |
293 | .dst_ops = &xfrm6_dst_ops, |
294 | .dst_lookup = xfrm6_dst_lookup, | |
67ba4152 | 295 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 296 | .decode_session = _decode_session6, |
25ee3286 | 297 | .get_tos = xfrm6_get_tos, |
a1b05140 | 298 | .init_path = xfrm6_init_path, |
25ee3286 | 299 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 300 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
301 | }; |
302 | ||
0013caba | 303 | static int __init xfrm6_policy_init(void) |
1da177e4 | 304 | { |
0013caba | 305 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
1da177e4 LT |
306 | } |
307 | ||
308 | static void xfrm6_policy_fini(void) | |
309 | { | |
310 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
311 | } | |
312 | ||
db71789c | 313 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
314 | static struct ctl_table xfrm6_policy_table[] = { |
315 | { | |
a44a4a00 | 316 | .procname = "xfrm6_gc_thresh", |
67ba4152 IM |
317 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
318 | .maxlen = sizeof(int), | |
319 | .mode = 0644, | |
a44a4a00 NH |
320 | .proc_handler = proc_dointvec, |
321 | }, | |
322 | { } | |
323 | }; | |
324 | ||
8d068875 MK |
325 | static int __net_init xfrm6_net_init(struct net *net) |
326 | { | |
327 | struct ctl_table *table; | |
328 | struct ctl_table_header *hdr; | |
329 | ||
330 | table = xfrm6_policy_table; | |
331 | if (!net_eq(net, &init_net)) { | |
332 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
333 | if (!table) | |
334 | goto err_alloc; | |
335 | ||
336 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
337 | } | |
338 | ||
339 | hdr = register_net_sysctl(net, "net/ipv6", table); | |
340 | if (!hdr) | |
341 | goto err_reg; | |
342 | ||
343 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
344 | return 0; | |
345 | ||
346 | err_reg: | |
347 | if (!net_eq(net, &init_net)) | |
348 | kfree(table); | |
349 | err_alloc: | |
350 | return -ENOMEM; | |
351 | } | |
352 | ||
353 | static void __net_exit xfrm6_net_exit(struct net *net) | |
354 | { | |
355 | struct ctl_table *table; | |
356 | ||
63159f29 | 357 | if (!net->ipv6.sysctl.xfrm6_hdr) |
8d068875 MK |
358 | return; |
359 | ||
360 | table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg; | |
361 | unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr); | |
362 | if (!net_eq(net, &init_net)) | |
363 | kfree(table); | |
364 | } | |
365 | ||
366 | static struct pernet_operations xfrm6_net_ops = { | |
367 | .init = xfrm6_net_init, | |
368 | .exit = xfrm6_net_exit, | |
369 | }; | |
db71789c | 370 | #endif |
a44a4a00 | 371 | |
0013caba | 372 | int __init xfrm6_init(void) |
1da177e4 | 373 | { |
0013caba | 374 | int ret; |
c3813286 | 375 | |
fc66f95c | 376 | dst_entries_init(&xfrm6_dst_ops); |
d7c7544c AD |
377 | |
378 | ret = xfrm6_policy_init(); | |
fc66f95c ED |
379 | if (ret) { |
380 | dst_entries_destroy(&xfrm6_dst_ops); | |
d7c7544c | 381 | goto out; |
fc66f95c | 382 | } |
d7c7544c AD |
383 | ret = xfrm6_state_init(); |
384 | if (ret) | |
385 | goto out_policy; | |
386 | ||
7e14ea15 SK |
387 | ret = xfrm6_protocol_init(); |
388 | if (ret) | |
389 | goto out_state; | |
390 | ||
db71789c | 391 | #ifdef CONFIG_SYSCTL |
8d068875 | 392 | register_pernet_subsys(&xfrm6_net_ops); |
db71789c | 393 | #endif |
0013caba DL |
394 | out: |
395 | return ret; | |
7e14ea15 SK |
396 | out_state: |
397 | xfrm6_state_fini(); | |
0013caba DL |
398 | out_policy: |
399 | xfrm6_policy_fini(); | |
400 | goto out; | |
1da177e4 LT |
401 | } |
402 | ||
403 | void xfrm6_fini(void) | |
404 | { | |
db71789c | 405 | #ifdef CONFIG_SYSCTL |
8d068875 | 406 | unregister_pernet_subsys(&xfrm6_net_ops); |
db71789c | 407 | #endif |
7e14ea15 | 408 | xfrm6_protocol_fini(); |
1da177e4 LT |
409 | xfrm6_policy_fini(); |
410 | xfrm6_state_fini(); | |
fc66f95c | 411 | dst_entries_destroy(&xfrm6_dst_ops); |
1da177e4 | 412 | } |