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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]; | |
1da177e4 | 138 | |
7e1dc7b6 DM |
139 | memset(fl6, 0, sizeof(struct flowi6)); |
140 | fl6->flowi6_mark = skb->mark; | |
bafd4bd4 | 141 | fl6->flowi6_oif = skb_dst(skb)->dev->ifindex; |
44b451f1 | 142 | |
4e3fd7a0 AD |
143 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
144 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; | |
1da177e4 | 145 | |
59cae009 WY |
146 | while (nh + offset + 1 < skb->data || |
147 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { | |
d56f90a7 ACM |
148 | nh = skb_network_header(skb); |
149 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); | |
e3cae904 | 150 | |
1da177e4 | 151 | switch (nexthdr) { |
7e3a42a1 ND |
152 | case NEXTHDR_FRAGMENT: |
153 | onlyproto = 1; | |
1da177e4 LT |
154 | case NEXTHDR_ROUTING: |
155 | case NEXTHDR_HOP: | |
156 | case NEXTHDR_DEST: | |
157 | offset += ipv6_optlen(exthdr); | |
158 | nexthdr = exthdr->nexthdr; | |
d56f90a7 | 159 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
1da177e4 LT |
160 | break; |
161 | ||
162 | case IPPROTO_UDP: | |
ba4e58ec | 163 | case IPPROTO_UDPLITE: |
1da177e4 LT |
164 | case IPPROTO_TCP: |
165 | case IPPROTO_SCTP: | |
9e999993 | 166 | case IPPROTO_DCCP: |
59cae009 WY |
167 | if (!onlyproto && (nh + offset + 4 < skb->data || |
168 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { | |
8c689a6e | 169 | __be16 *ports = (__be16 *)exthdr; |
1da177e4 | 170 | |
1958b856 DM |
171 | fl6->fl6_sport = ports[!!reverse]; |
172 | fl6->fl6_dport = ports[!reverse]; | |
1da177e4 | 173 | } |
7e1dc7b6 | 174 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
175 | return; |
176 | ||
177 | case IPPROTO_ICMPV6: | |
7e3a42a1 | 178 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) { |
1da177e4 LT |
179 | u8 *icmp = (u8 *)exthdr; |
180 | ||
1958b856 DM |
181 | fl6->fl6_icmp_type = icmp[0]; |
182 | fl6->fl6_icmp_code = icmp[1]; | |
1da177e4 | 183 | } |
7e1dc7b6 | 184 | fl6->flowi6_proto = nexthdr; |
1da177e4 LT |
185 | return; |
186 | ||
07a93626 | 187 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
2ce4272a | 188 | case IPPROTO_MH: |
7e3a42a1 | 189 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
2ce4272a MN |
190 | struct ip6_mh *mh; |
191 | mh = (struct ip6_mh *)exthdr; | |
192 | ||
1958b856 | 193 | fl6->fl6_mh_type = mh->ip6mh_type; |
2ce4272a | 194 | } |
7e1dc7b6 | 195 | fl6->flowi6_proto = nexthdr; |
2ce4272a MN |
196 | return; |
197 | #endif | |
198 | ||
1da177e4 LT |
199 | /* XXX Why are there these headers? */ |
200 | case IPPROTO_AH: | |
201 | case IPPROTO_ESP: | |
202 | case IPPROTO_COMP: | |
203 | default: | |
1958b856 | 204 | fl6->fl6_ipsec_spi = 0; |
7e1dc7b6 | 205 | fl6->flowi6_proto = nexthdr; |
1da177e4 | 206 | return; |
3ff50b79 | 207 | } |
1da177e4 LT |
208 | } |
209 | } | |
210 | ||
569d3645 | 211 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
1da177e4 | 212 | { |
d7c7544c AD |
213 | struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops); |
214 | ||
215 | xfrm6_policy_afinfo.garbage_collect(net); | |
fc66f95c | 216 | return dst_entries_get_fast(ops) > ops->gc_thresh * 2; |
1da177e4 LT |
217 | } |
218 | ||
6700c270 DM |
219 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
220 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
221 | { |
222 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
223 | struct dst_entry *path = xdst->route; | |
224 | ||
6700c270 | 225 | path->ops->update_pmtu(path, sk, skb, mtu); |
1da177e4 LT |
226 | } |
227 | ||
6700c270 DM |
228 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
229 | struct sk_buff *skb) | |
ec18d9a2 DM |
230 | { |
231 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
232 | struct dst_entry *path = xdst->route; | |
233 | ||
6700c270 | 234 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
235 | } |
236 | ||
aabc9761 HX |
237 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
238 | { | |
239 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
240 | ||
241 | if (likely(xdst->u.rt6.rt6i_idev)) | |
242 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 243 | dst_destroy_metrics_generic(dst); |
97bab73f DM |
244 | if (rt6_has_peer(&xdst->u.rt6)) { |
245 | struct inet_peer *peer = rt6_peer_ptr(&xdst->u.rt6); | |
246 | inet_putpeer(peer); | |
247 | } | |
aabc9761 HX |
248 | xfrm_dst_destroy(xdst); |
249 | } | |
250 | ||
251 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
252 | int unregister) | |
253 | { | |
254 | struct xfrm_dst *xdst; | |
255 | ||
256 | if (!unregister) | |
257 | return; | |
258 | ||
259 | xdst = (struct xfrm_dst *)dst; | |
260 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 261 | struct inet6_dev *loopback_idev = |
c346dca1 | 262 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
263 | BUG_ON(!loopback_idev); |
264 | ||
265 | do { | |
266 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
267 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
268 | in6_dev_hold(loopback_idev); | |
269 | xdst = (struct xfrm_dst *)xdst->u.dst.child; | |
270 | } while (xdst->u.dst.xfrm); | |
271 | ||
272 | __in6_dev_put(loopback_idev); | |
273 | } | |
274 | ||
275 | xfrm_dst_ifdown(dst, dev); | |
276 | } | |
277 | ||
1da177e4 LT |
278 | static struct dst_ops xfrm6_dst_ops = { |
279 | .family = AF_INET6, | |
09640e63 | 280 | .protocol = cpu_to_be16(ETH_P_IPV6), |
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, | |
a1e59abf | 295 | .get_saddr = xfrm6_get_saddr, |
1da177e4 | 296 | .decode_session = _decode_session6, |
25ee3286 | 297 | .get_tos = xfrm6_get_tos, |
9d7b0fc1 | 298 | .init_dst = xfrm6_init_dst, |
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 | { |
0013caba | 306 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
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", |
d7c7544c | 318 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
a44a4a00 NH |
319 | .maxlen = sizeof(int), |
320 | .mode = 0644, | |
321 | .proc_handler = proc_dointvec, | |
322 | }, | |
323 | { } | |
324 | }; | |
325 | ||
8d068875 MK |
326 | static int __net_init xfrm6_net_init(struct net *net) |
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 | ||
354 | static void __net_exit xfrm6_net_exit(struct net *net) | |
355 | { | |
356 | struct ctl_table *table; | |
357 | ||
358 | if (net->ipv6.sysctl.xfrm6_hdr == NULL) | |
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 | } | |
366 | ||
367 | static struct pernet_operations xfrm6_net_ops = { | |
368 | .init = xfrm6_net_init, | |
369 | .exit = xfrm6_net_exit, | |
370 | }; | |
db71789c | 371 | #endif |
a44a4a00 | 372 | |
0013caba | 373 | int __init xfrm6_init(void) |
1da177e4 | 374 | { |
0013caba | 375 | int ret; |
c3813286 | 376 | |
fc66f95c | 377 | dst_entries_init(&xfrm6_dst_ops); |
d7c7544c AD |
378 | |
379 | ret = xfrm6_policy_init(); | |
fc66f95c ED |
380 | if (ret) { |
381 | dst_entries_destroy(&xfrm6_dst_ops); | |
d7c7544c | 382 | goto out; |
fc66f95c | 383 | } |
d7c7544c AD |
384 | ret = xfrm6_state_init(); |
385 | if (ret) | |
386 | goto out_policy; | |
387 | ||
db71789c | 388 | #ifdef CONFIG_SYSCTL |
8d068875 | 389 | register_pernet_subsys(&xfrm6_net_ops); |
db71789c | 390 | #endif |
0013caba DL |
391 | out: |
392 | return ret; | |
393 | out_policy: | |
394 | xfrm6_policy_fini(); | |
395 | goto out; | |
1da177e4 LT |
396 | } |
397 | ||
398 | void xfrm6_fini(void) | |
399 | { | |
db71789c | 400 | #ifdef CONFIG_SYSCTL |
8d068875 | 401 | unregister_pernet_subsys(&xfrm6_net_ops); |
db71789c | 402 | #endif |
1da177e4 LT |
403 | xfrm6_policy_fini(); |
404 | xfrm6_state_fini(); | |
fc66f95c | 405 | dst_entries_destroy(&xfrm6_dst_ops); |
1da177e4 | 406 | } |