Commit | Line | Data |
---|---|---|
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); |
25ee3286 HX |
106 | if (!xdst->u.rt6.rt6i_idev) |
107 | return -ENODEV; | |
1da177e4 | 108 | |
97bab73f | 109 | rt6_transfer_peer(&xdst->u.rt6, rt); |
7cc2edb8 | 110 | |
25ee3286 HX |
111 | /* Sheit... I remember I did this right. Apparently, |
112 | * it was magically lost, so this code needs audit */ | |
113 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
114 | RTF_LOCAL); | |
115 | xdst->u.rt6.rt6i_metric = rt->rt6i_metric; | |
116 | xdst->u.rt6.rt6i_node = rt->rt6i_node; | |
a1b05140 MN |
117 | if (rt->rt6i_node) |
118 | xdst->route_cookie = rt->rt6i_node->fn_sernum; | |
25ee3286 HX |
119 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; |
120 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
121 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
1da177e4 | 122 | |
1da177e4 | 123 | return 0; |
1da177e4 LT |
124 | } |
125 | ||
126 | static inline void | |
d5422efe | 127 | _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) |
1da177e4 | 128 | { |
7e1dc7b6 | 129 | struct flowi6 *fl6 = &fl->u.ip6; |
7e3a42a1 | 130 | int onlyproto = 0; |
cfe1fc77 | 131 | u16 offset = skb_network_header_len(skb); |
b71d1d42 | 132 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
e3cae904 | 133 | struct ipv6_opt_hdr *exthdr; |
d56f90a7 ACM |
134 | const unsigned char *nh = skb_network_header(skb); |
135 | u8 nexthdr = nh[IP6CB(skb)->nhoff]; | |
1da177e4 | 136 | |
7e1dc7b6 DM |
137 | memset(fl6, 0, sizeof(struct flowi6)); |
138 | fl6->flowi6_mark = skb->mark; | |
44b451f1 | 139 | |
4e3fd7a0 AD |
140 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
141 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; | |
1da177e4 | 142 | |
59cae009 WY |
143 | while (nh + offset + 1 < skb->data || |
144 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { | |
d56f90a7 ACM |
145 | nh = skb_network_header(skb); |
146 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 147 | |
1da177e4 | 148 | switch (nexthdr) { |
7e3a42a1 ND |
149 | case NEXTHDR_FRAGMENT: |
150 | onlyproto = 1; | |
1da177e4 LT |
151 | case NEXTHDR_ROUTING: |
152 | case NEXTHDR_HOP: | |
153 | case NEXTHDR_DEST: | |
154 | offset += ipv6_optlen(exthdr); | |
155 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 156 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
157 | break; |
158 | ||
159 | case IPPROTO_UDP: | |
ba4e58ec | 160 | case IPPROTO_UDPLITE: |
1da177e4 LT |
161 | case IPPROTO_TCP: |
162 | case IPPROTO_SCTP: | |
9e999993 | 163 | case IPPROTO_DCCP: |
59cae009 WY |
164 | if (!onlyproto && (nh + offset + 4 < skb->data || |
165 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { | |
8c689a6e | 166 | __be16 *ports = (__be16 *)exthdr; |
1da177e4 | 167 | |
1958b856 DM |
168 | fl6->fl6_sport = ports[!!reverse]; |
169 | fl6->fl6_dport = ports[!reverse]; | |
1da177e4 | 170 | } |
7e1dc7b6 | 171 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
172 | return; |
173 | ||
174 | case IPPROTO_ICMPV6: | |
7e3a42a1 | 175 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) { |
1da177e4 LT |
176 | u8 *icmp = (u8 *)exthdr; |
177 | ||
1958b856 DM |
178 | fl6->fl6_icmp_type = icmp[0]; |
179 | fl6->fl6_icmp_code = icmp[1]; | |
1da177e4 | 180 | } |
7e1dc7b6 | 181 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
182 | return; |
183 | ||
07a93626 | 184 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a | 185 | case IPPROTO_MH: |
7e3a42a1 | 186 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
2ce4272a MN |
187 | struct ip6_mh *mh; |
188 | mh = (struct ip6_mh *)exthdr; | |
189 | ||
1958b856 | 190 | fl6->fl6_mh_type = mh->ip6mh_type; |
2ce4272a | 191 | } |
7e1dc7b6 | 192 | fl6->flowi6_proto = nexthdr; |
2ce4272a MN |
193 | return; |
194 | #endif | |
195 | ||
1da177e4 LT |
196 | /* XXX Why are there these headers? */ |
197 | case IPPROTO_AH: | |
198 | case IPPROTO_ESP: | |
199 | case IPPROTO_COMP: | |
200 | default: | |
1958b856 | 201 | fl6->fl6_ipsec_spi = 0; |
7e1dc7b6 | 202 | fl6->flowi6_proto = nexthdr; |
1da177e4 | 203 | return; |
3ff50b79 | 204 | } |
1da177e4 LT |
205 | } |
206 | } | |
207 | ||
569d3645 | 208 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
1da177e4 | 209 | { |
d7c7544c AD |
210 | struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops); |
211 | ||
212 | xfrm6_policy_afinfo.garbage_collect(net); | |
fc66f95c | 213 | return dst_entries_get_fast(ops) > ops->gc_thresh * 2; |
1da177e4 LT |
214 | } |
215 | ||
6700c270 DM |
216 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
217 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
218 | { |
219 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
220 | struct dst_entry *path = xdst->route; | |
221 | ||
6700c270 | 222 | path->ops->update_pmtu(path, sk, skb, mtu); |
1da177e4 LT |
223 | } |
224 | ||
6700c270 DM |
225 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
226 | struct sk_buff *skb) | |
ec18d9a2 DM |
227 | { |
228 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
229 | struct dst_entry *path = xdst->route; | |
230 | ||
6700c270 | 231 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
232 | } |
233 | ||
aabc9761 HX |
234 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
235 | { | |
236 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
237 | ||
238 | if (likely(xdst->u.rt6.rt6i_idev)) | |
239 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 240 | dst_destroy_metrics_generic(dst); |
97bab73f DM |
241 | if (rt6_has_peer(&xdst->u.rt6)) { |
242 | struct inet_peer *peer = rt6_peer_ptr(&xdst->u.rt6); | |
243 | inet_putpeer(peer); | |
244 | } | |
aabc9761 HX |
245 | xfrm_dst_destroy(xdst); |
246 | } | |
247 | ||
248 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
249 | int unregister) | |
250 | { | |
251 | struct xfrm_dst *xdst; | |
252 | ||
253 | if (!unregister) | |
254 | return; | |
255 | ||
256 | xdst = (struct xfrm_dst *)dst; | |
257 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 258 | struct inet6_dev *loopback_idev = |
c346dca1 | 259 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
260 | BUG_ON(!loopback_idev); |
261 | ||
262 | do { | |
263 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
264 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
265 | in6_dev_hold(loopback_idev); | |
266 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
267 | } while (xdst->u.dst.xfrm); | |
268 | ||
269 | __in6_dev_put(loopback_idev); | |
270 | } | |
271 | ||
272 | xfrm_dst_ifdown(dst, dev); | |
273 | } | |
274 | ||
1da177e4 LT |
275 | static struct dst_ops xfrm6_dst_ops = { |
276 | .family = AF_INET6, | |
09640e63 | 277 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
278 | .gc = xfrm6_garbage_collect, |
279 | .update_pmtu = xfrm6_update_pmtu, | |
ec18d9a2 | 280 | .redirect = xfrm6_redirect, |
62fa8a84 | 281 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 HX |
282 | .destroy = xfrm6_dst_destroy, |
283 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 284 | .local_out = __ip6_local_out, |
1da177e4 | 285 | .gc_thresh = 1024, |
1da177e4 LT |
286 | }; |
287 | ||
288 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { | |
289 | .family = AF_INET6, | |
1da177e4 LT |
290 | .dst_ops = &xfrm6_dst_ops, |
291 | .dst_lookup = xfrm6_dst_lookup, | |
a1e59abf | 292 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 293 | .decode_session = _decode_session6, |
25ee3286 | 294 | .get_tos = xfrm6_get_tos, |
9d7b0fc1 | 295 | .init_dst = xfrm6_init_dst, |
a1b05140 | 296 | .init_path = xfrm6_init_path, |
25ee3286 | 297 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 298 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
299 | }; |
300 | ||
0013caba | 301 | static int __init xfrm6_policy_init(void) |
1da177e4 | 302 | { |
0013caba | 303 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
1da177e4 LT |
304 | } |
305 | ||
306 | static void xfrm6_policy_fini(void) | |
307 | { | |
308 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
309 | } | |
310 | ||
db71789c | 311 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
312 | static struct ctl_table xfrm6_policy_table[] = { |
313 | { | |
a44a4a00 | 314 | .procname = "xfrm6_gc_thresh", |
d7c7544c | 315 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
a44a4a00 NH |
316 | .maxlen = sizeof(int), |
317 | .mode = 0644, | |
318 | .proc_handler = proc_dointvec, | |
319 | }, | |
320 | { } | |
321 | }; | |
322 | ||
8d068875 MK |
323 | static int __net_init xfrm6_net_init(struct net *net) |
324 | { | |
325 | struct ctl_table *table; | |
326 | struct ctl_table_header *hdr; | |
327 | ||
328 | table = xfrm6_policy_table; | |
329 | if (!net_eq(net, &init_net)) { | |
330 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
331 | if (!table) | |
332 | goto err_alloc; | |
333 | ||
334 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
335 | } | |
336 | ||
337 | hdr = register_net_sysctl(net, "net/ipv6", table); | |
338 | if (!hdr) | |
339 | goto err_reg; | |
340 | ||
341 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
342 | return 0; | |
343 | ||
344 | err_reg: | |
345 | if (!net_eq(net, &init_net)) | |
346 | kfree(table); | |
347 | err_alloc: | |
348 | return -ENOMEM; | |
349 | } | |
350 | ||
351 | static void __net_exit xfrm6_net_exit(struct net *net) | |
352 | { | |
353 | struct ctl_table *table; | |
354 | ||
355 | if (net->ipv6.sysctl.xfrm6_hdr == NULL) | |
356 | return; | |
357 | ||
358 | table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg; | |
359 | unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr); | |
360 | if (!net_eq(net, &init_net)) | |
361 | kfree(table); | |
362 | } | |
363 | ||
364 | static struct pernet_operations xfrm6_net_ops = { | |
365 | .init = xfrm6_net_init, | |
366 | .exit = xfrm6_net_exit, | |
367 | }; | |
db71789c | 368 | #endif |
a44a4a00 | 369 | |
0013caba | 370 | int __init xfrm6_init(void) |
1da177e4 | 371 | { |
0013caba | 372 | int ret; |
c3813286 | 373 | |
fc66f95c | 374 | dst_entries_init(&xfrm6_dst_ops); |
d7c7544c AD |
375 | |
376 | ret = xfrm6_policy_init(); | |
fc66f95c ED |
377 | if (ret) { |
378 | dst_entries_destroy(&xfrm6_dst_ops); | |
d7c7544c | 379 | goto out; |
fc66f95c | 380 | } |
d7c7544c AD |
381 | ret = xfrm6_state_init(); |
382 | if (ret) | |
383 | goto out_policy; | |
384 | ||
db71789c | 385 | #ifdef CONFIG_SYSCTL |
8d068875 | 386 | register_pernet_subsys(&xfrm6_net_ops); |
db71789c | 387 | #endif |
0013caba DL |
388 | out: |
389 | return ret; | |
390 | out_policy: | |
391 | xfrm6_policy_fini(); | |
392 | goto out; | |
1da177e4 LT |
393 | } |
394 | ||
395 | void xfrm6_fini(void) | |
396 | { | |
db71789c | 397 | #ifdef CONFIG_SYSCTL |
8d068875 | 398 | unregister_pernet_subsys(&xfrm6_net_ops); |
db71789c | 399 | #endif |
1da177e4 LT |
400 | xfrm6_policy_fini(); |
401 | xfrm6_state_fini(); | |
fc66f95c | 402 | dst_entries_destroy(&xfrm6_dst_ops); |
1da177e4 | 403 | } |