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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 | |
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 BH |
63 | dev = ip6_dst_idev(dst)->dev; |
64 | ipv6_dev_get_saddr(dev_net(dev), dev, | |
7cbca67c | 65 | (struct in6_addr *)&daddr->a6, 0, |
5e5f3f0f | 66 | (struct in6_addr *)&saddr->a6); |
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 | |
9d7b0fc1 PM |
76 | static void xfrm6_init_dst(struct net *net, struct xfrm_dst *xdst) |
77 | { | |
78 | struct rt6_info *rt = (struct rt6_info *)xdst; | |
79 | ||
80 | rt6_init_peer(rt, net->ipv6.peers); | |
81 | } | |
82 | ||
a1b05140 MN |
83 | static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
84 | int nfheader_len) | |
85 | { | |
86 | if (dst->ops->family == AF_INET6) { | |
87 | struct rt6_info *rt = (struct rt6_info*)dst; | |
88 | if (rt->rt6i_node) | |
89 | path->path_cookie = rt->rt6i_node->fn_sernum; | |
90 | } | |
91 | ||
92 | path->u.rt6.rt6i_nfheader_len = nfheader_len; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
87c1e12b | 97 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 98 | const struct flowi *fl) |
25ee3286 HX |
99 | { |
100 | struct rt6_info *rt = (struct rt6_info*)xdst->route; | |
1da177e4 | 101 | |
25ee3286 HX |
102 | xdst->u.dst.dev = dev; |
103 | dev_hold(dev); | |
1da177e4 | 104 | |
bc8e4b95 | 105 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
84c4a9df CW |
106 | if (!xdst->u.rt6.rt6i_idev) { |
107 | dev_put(dev); | |
25ee3286 | 108 | return -ENODEV; |
84c4a9df | 109 | } |
1da177e4 | 110 | |
97bab73f | 111 | rt6_transfer_peer(&xdst->u.rt6, rt); |
7cc2edb8 | 112 | |
25ee3286 HX |
113 | /* Sheit... I remember I did this right. Apparently, |
114 | * it was magically lost, so this code needs audit */ | |
115 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
116 | RTF_LOCAL); | |
117 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
118 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
a1b05140 MN |
119 | if (rt->rt6i_node) |
120 | xdst->route_cookie = rt->rt6i_node->fn_sernum; | |
25ee3286 HX |
121 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; |
122 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
123 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
1da177e4 | 124 | |
1da177e4 | 125 | return 0; |
1da177e4 LT |
126 | } |
127 | ||
128 | static inline void | |
d5422efe | 129 | _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) |
1da177e4 | 130 | { |
7e1dc7b6 | 131 | struct flowi6 *fl6 = &fl->u.ip6; |
7e3a42a1 | 132 | int onlyproto = 0; |
cfe1fc77 | 133 | u16 offset = skb_network_header_len(skb); |
b71d1d42 | 134 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
e3cae904 | 135 | struct ipv6_opt_hdr *exthdr; |
d56f90a7 ACM |
136 | const unsigned char *nh = skb_network_header(skb); |
137 | u8 nexthdr = nh[IP6CB(skb)->nhoff]; | |
84502b5e SK |
138 | int oif = 0; |
139 | ||
140 | if (skb_dst(skb)) | |
141 | oif = skb_dst(skb)->dev->ifindex; | |
1da177e4 | 142 | |
7e1dc7b6 DM |
143 | memset(fl6, 0, sizeof(struct flowi6)); |
144 | fl6->flowi6_mark = skb->mark; | |
84502b5e | 145 | fl6->flowi6_oif = reverse ? skb->skb_iif : oif; |
44b451f1 | 146 | |
4e3fd7a0 AD |
147 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
148 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; | |
1da177e4 | 149 | |
59cae009 WY |
150 | while (nh + offset + 1 < skb->data || |
151 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { | |
d56f90a7 ACM |
152 | nh = skb_network_header(skb); |
153 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 154 | |
1da177e4 | 155 | switch (nexthdr) { |
7e3a42a1 ND |
156 | case NEXTHDR_FRAGMENT: |
157 | onlyproto = 1; | |
1da177e4 LT |
158 | case NEXTHDR_ROUTING: |
159 | case NEXTHDR_HOP: | |
160 | case NEXTHDR_DEST: | |
161 | offset += ipv6_optlen(exthdr); | |
162 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 163 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
164 | break; |
165 | ||
166 | case IPPROTO_UDP: | |
ba4e58ec | 167 | case IPPROTO_UDPLITE: |
1da177e4 LT |
168 | case IPPROTO_TCP: |
169 | case IPPROTO_SCTP: | |
9e999993 | 170 | case IPPROTO_DCCP: |
59cae009 WY |
171 | if (!onlyproto && (nh + offset + 4 < skb->data || |
172 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { | |
8c689a6e | 173 | __be16 *ports = (__be16 *)exthdr; |
1da177e4 | 174 | |
1958b856 DM |
175 | fl6->fl6_sport = ports[!!reverse]; |
176 | fl6->fl6_dport = ports[!reverse]; | |
1da177e4 | 177 | } |
7e1dc7b6 | 178 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
179 | return; |
180 | ||
181 | case IPPROTO_ICMPV6: | |
7e3a42a1 | 182 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) { |
1da177e4 LT |
183 | u8 *icmp = (u8 *)exthdr; |
184 | ||
1958b856 DM |
185 | fl6->fl6_icmp_type = icmp[0]; |
186 | fl6->fl6_icmp_code = icmp[1]; | |
1da177e4 | 187 | } |
7e1dc7b6 | 188 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
189 | return; |
190 | ||
07a93626 | 191 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a | 192 | case IPPROTO_MH: |
7e3a42a1 | 193 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
2ce4272a MN |
194 | struct ip6_mh *mh; |
195 | mh = (struct ip6_mh *)exthdr; | |
196 | ||
1958b856 | 197 | fl6->fl6_mh_type = mh->ip6mh_type; |
2ce4272a | 198 | } |
7e1dc7b6 | 199 | fl6->flowi6_proto = nexthdr; |
2ce4272a MN |
200 | return; |
201 | #endif | |
202 | ||
1da177e4 LT |
203 | /* XXX Why are there these headers? */ |
204 | case IPPROTO_AH: | |
205 | case IPPROTO_ESP: | |
206 | case IPPROTO_COMP: | |
207 | default: | |
1958b856 | 208 | fl6->fl6_ipsec_spi = 0; |
7e1dc7b6 | 209 | fl6->flowi6_proto = nexthdr; |
1da177e4 | 210 | return; |
3ff50b79 | 211 | } |
1da177e4 LT |
212 | } |
213 | } | |
214 | ||
569d3645 | 215 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
1da177e4 | 216 | { |
d7c7544c AD |
217 | struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops); |
218 | ||
219 | xfrm6_policy_afinfo.garbage_collect(net); | |
fc66f95c | 220 | return dst_entries_get_fast(ops) > ops->gc_thresh * 2; |
1da177e4 LT |
221 | } |
222 | ||
6700c270 DM |
223 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
224 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
225 | { |
226 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
227 | struct dst_entry *path = xdst->route; | |
228 | ||
6700c270 | 229 | path->ops->update_pmtu(path, sk, skb, mtu); |
1da177e4 LT |
230 | } |
231 | ||
6700c270 DM |
232 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
233 | struct sk_buff *skb) | |
ec18d9a2 DM |
234 | { |
235 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
236 | struct dst_entry *path = xdst->route; | |
237 | ||
6700c270 | 238 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
239 | } |
240 | ||
aabc9761 HX |
241 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
242 | { | |
243 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
244 | ||
245 | if (likely(xdst->u.rt6.rt6i_idev)) | |
246 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 247 | dst_destroy_metrics_generic(dst); |
97bab73f DM |
248 | if (rt6_has_peer(&xdst->u.rt6)) { |
249 | struct inet_peer *peer = rt6_peer_ptr(&xdst->u.rt6); | |
250 | inet_putpeer(peer); | |
251 | } | |
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 | ||
1da177e4 LT |
282 | static struct dst_ops xfrm6_dst_ops = { |
283 | .family = AF_INET6, | |
09640e63 | 284 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
285 | .gc = xfrm6_garbage_collect, |
286 | .update_pmtu = xfrm6_update_pmtu, | |
ec18d9a2 | 287 | .redirect = xfrm6_redirect, |
62fa8a84 | 288 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 HX |
289 | .destroy = xfrm6_dst_destroy, |
290 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 291 | .local_out = __ip6_local_out, |
eeb1b733 | 292 | .gc_thresh = 32768, |
1da177e4 LT |
293 | }; |
294 | ||
295 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
296 | .family = AF_INET6, | |
1da177e4 LT |
297 | .dst_ops = &xfrm6_dst_ops, |
298 | .dst_lookup = xfrm6_dst_lookup, | |
a1e59abf | 299 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 300 | .decode_session = _decode_session6, |
25ee3286 | 301 | .get_tos = xfrm6_get_tos, |
9d7b0fc1 | 302 | .init_dst = xfrm6_init_dst, |
a1b05140 | 303 | .init_path = xfrm6_init_path, |
25ee3286 | 304 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 305 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
306 | }; |
307 | ||
0013caba | 308 | static int __init xfrm6_policy_init(void) |
1da177e4 | 309 | { |
0013caba | 310 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
1da177e4 LT |
311 | } |
312 | ||
313 | static void xfrm6_policy_fini(void) | |
314 | { | |
315 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
316 | } | |
317 | ||
db71789c | 318 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
319 | static struct ctl_table xfrm6_policy_table[] = { |
320 | { | |
a44a4a00 | 321 | .procname = "xfrm6_gc_thresh", |
d7c7544c | 322 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
a44a4a00 NH |
323 | .maxlen = sizeof(int), |
324 | .mode = 0644, | |
325 | .proc_handler = proc_dointvec, | |
326 | }, | |
327 | { } | |
328 | }; | |
329 | ||
8d068875 MK |
330 | static int __net_init xfrm6_net_init(struct net *net) |
331 | { | |
332 | struct ctl_table *table; | |
333 | struct ctl_table_header *hdr; | |
334 | ||
335 | table = xfrm6_policy_table; | |
336 | if (!net_eq(net, &init_net)) { | |
337 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
338 | if (!table) | |
339 | goto err_alloc; | |
340 | ||
341 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
342 | } | |
343 | ||
344 | hdr = register_net_sysctl(net, "net/ipv6", table); | |
345 | if (!hdr) | |
346 | goto err_reg; | |
347 | ||
348 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
349 | return 0; | |
350 | ||
351 | err_reg: | |
352 | if (!net_eq(net, &init_net)) | |
353 | kfree(table); | |
354 | err_alloc: | |
355 | return -ENOMEM; | |
356 | } | |
357 | ||
358 | static void __net_exit xfrm6_net_exit(struct net *net) | |
359 | { | |
360 | struct ctl_table *table; | |
361 | ||
362 | if (net->ipv6.sysctl.xfrm6_hdr == NULL) | |
363 | return; | |
364 | ||
365 | table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg; | |
366 | unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr); | |
367 | if (!net_eq(net, &init_net)) | |
368 | kfree(table); | |
369 | } | |
370 | ||
371 | static struct pernet_operations xfrm6_net_ops = { | |
372 | .init = xfrm6_net_init, | |
373 | .exit = xfrm6_net_exit, | |
374 | }; | |
db71789c | 375 | #endif |
a44a4a00 | 376 | |
0013caba | 377 | int __init xfrm6_init(void) |
1da177e4 | 378 | { |
0013caba | 379 | int ret; |
c3813286 | 380 | |
fc66f95c | 381 | dst_entries_init(&xfrm6_dst_ops); |
d7c7544c AD |
382 | |
383 | ret = xfrm6_policy_init(); | |
fc66f95c ED |
384 | if (ret) { |
385 | dst_entries_destroy(&xfrm6_dst_ops); | |
d7c7544c | 386 | goto out; |
fc66f95c | 387 | } |
d7c7544c AD |
388 | ret = xfrm6_state_init(); |
389 | if (ret) | |
390 | goto out_policy; | |
391 | ||
db71789c | 392 | #ifdef CONFIG_SYSCTL |
8d068875 | 393 | register_pernet_subsys(&xfrm6_net_ops); |
db71789c | 394 | #endif |
0013caba DL |
395 | out: |
396 | return ret; | |
397 | out_policy: | |
398 | xfrm6_policy_fini(); | |
399 | goto out; | |
1da177e4 LT |
400 | } |
401 | ||
402 | void xfrm6_fini(void) | |
403 | { | |
db71789c | 404 | #ifdef CONFIG_SYSCTL |
8d068875 | 405 | unregister_pernet_subsys(&xfrm6_net_ops); |
db71789c | 406 | #endif |
1da177e4 LT |
407 | xfrm6_policy_fini(); |
408 | xfrm6_state_fini(); | |
fc66f95c | 409 | dst_entries_destroy(&xfrm6_dst_ops); |
1da177e4 | 410 | } |