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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 |
11 | * |
12 | */ |
13 | |
14 | #include <linux/err.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/netdevice.h> |
17 | #include <net/addrconf.h> |
18 | #include <net/dst.h> |
19 | #include <net/xfrm.h> |
20 | #include <net/ip.h> |
21 | #include <net/ipv6.h> |
22 | #include <net/ip6_route.h> |
23 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
24 | #include <net/mip6.h> |
25 | #endif |
26 | |
27 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo; |
28 | |
29 | static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, |
30 | const xfrm_address_t *saddr, |
31 | const xfrm_address_t *daddr) |
32 | { |
33 | struct flowi6 fl6; |
34 | struct dst_entry *dst; |
35 | int err; |
36 | |
37 | memset(&fl6, 0, sizeof(fl6)); |
38 | memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr)); |
39 | if (saddr) |
40 | memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr)); |
41 | |
42 | dst = ip6_route_output(net, NULL, &fl6); |
43 | |
44 | err = dst->error; |
45 | if (dst->error) { |
46 | dst_release(dst); |
47 | dst = ERR_PTR(err); |
48 | } |
49 | |
50 | return dst; |
51 | } |
52 | |
53 | static int xfrm6_get_saddr(struct net *net, |
54 | xfrm_address_t *saddr, xfrm_address_t *daddr) |
55 | { |
56 | struct dst_entry *dst; |
57 | struct net_device *dev; |
58 | |
59 | dst = xfrm6_dst_lookup(net, 0, NULL, daddr); |
60 | if (IS_ERR(dst)) |
61 | return -EHOSTUNREACH; |
62 | |
63 | dev = ip6_dst_idev(dst)->dev; |
64 | ipv6_dev_get_saddr(dev_net(dev), dev, |
65 | (struct in6_addr *)&daddr->a6, 0, |
66 | (struct in6_addr *)&saddr->a6); |
67 | dst_release(dst); |
68 | return 0; |
69 | } |
70 | |
71 | static int xfrm6_get_tos(const struct flowi *fl) |
72 | { |
73 | return 0; |
74 | } |
75 | |
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 | |
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 | |
97 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
98 | const struct flowi *fl) |
99 | { |
100 | struct rt6_info *rt = (struct rt6_info*)xdst->route; |
101 | |
102 | xdst->u.dst.dev = dev; |
103 | dev_hold(dev); |
104 | |
105 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
106 | if (!xdst->u.rt6.rt6i_idev) { |
107 | dev_put(dev); |
108 | return -ENODEV; |
109 | } |
110 | |
111 | rt6_transfer_peer(&xdst->u.rt6, rt); |
112 | |
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; |
119 | if (rt->rt6i_node) |
120 | xdst->route_cookie = rt->rt6i_node->fn_sernum; |
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; |
124 | |
125 | return 0; |
126 | } |
127 | |
128 | static inline void |
129 | _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) |
130 | { |
131 | struct flowi6 *fl6 = &fl->u.ip6; |
132 | int onlyproto = 0; |
133 | u16 offset = skb_network_header_len(skb); |
134 | const struct ipv6hdr *hdr = ipv6_hdr(skb); |
135 | struct ipv6_opt_hdr *exthdr; |
136 | const unsigned char *nh = skb_network_header(skb); |
137 | u8 nexthdr = nh[IP6CB(skb)->nhoff]; |
138 | int oif = 0; |
139 | |
140 | if (skb_dst(skb)) |
141 | oif = skb_dst(skb)->dev->ifindex; |
142 | |
143 | memset(fl6, 0, sizeof(struct flowi6)); |
144 | fl6->flowi6_mark = skb->mark; |
145 | fl6->flowi6_oif = reverse ? skb->skb_iif : oif; |
146 | |
147 | fl6->daddr = reverse ? hdr->saddr : hdr->daddr; |
148 | fl6->saddr = reverse ? hdr->daddr : hdr->saddr; |
149 | |
150 | while (nh + offset + 1 < skb->data || |
151 | pskb_may_pull(skb, nh + offset + 1 - skb->data)) { |
152 | nh = skb_network_header(skb); |
153 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
154 | |
155 | switch (nexthdr) { |
156 | case NEXTHDR_FRAGMENT: |
157 | onlyproto = 1; |
158 | case NEXTHDR_ROUTING: |
159 | case NEXTHDR_HOP: |
160 | case NEXTHDR_DEST: |
161 | offset += ipv6_optlen(exthdr); |
162 | nexthdr = exthdr->nexthdr; |
163 | exthdr = (struct ipv6_opt_hdr *)(nh + offset); |
164 | break; |
165 | |
166 | case IPPROTO_UDP: |
167 | case IPPROTO_UDPLITE: |
168 | case IPPROTO_TCP: |
169 | case IPPROTO_SCTP: |
170 | case IPPROTO_DCCP: |
171 | if (!onlyproto && (nh + offset + 4 < skb->data || |
172 | pskb_may_pull(skb, nh + offset + 4 - skb->data))) { |
173 | __be16 *ports = (__be16 *)exthdr; |
174 | |
175 | fl6->fl6_sport = ports[!!reverse]; |
176 | fl6->fl6_dport = ports[!reverse]; |
177 | } |
178 | fl6->flowi6_proto = nexthdr; |
179 | return; |
180 | |
181 | case IPPROTO_ICMPV6: |
182 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) { |
183 | u8 *icmp = (u8 *)exthdr; |
184 | |
185 | fl6->fl6_icmp_type = icmp[0]; |
186 | fl6->fl6_icmp_code = icmp[1]; |
187 | } |
188 | fl6->flowi6_proto = nexthdr; |
189 | return; |
190 | |
191 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
192 | case IPPROTO_MH: |
193 | if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) { |
194 | struct ip6_mh *mh; |
195 | mh = (struct ip6_mh *)exthdr; |
196 | |
197 | fl6->fl6_mh_type = mh->ip6mh_type; |
198 | } |
199 | fl6->flowi6_proto = nexthdr; |
200 | return; |
201 | #endif |
202 | |
203 | /* XXX Why are there these headers? */ |
204 | case IPPROTO_AH: |
205 | case IPPROTO_ESP: |
206 | case IPPROTO_COMP: |
207 | default: |
208 | fl6->fl6_ipsec_spi = 0; |
209 | fl6->flowi6_proto = nexthdr; |
210 | return; |
211 | } |
212 | } |
213 | } |
214 | |
215 | static inline int xfrm6_garbage_collect(struct dst_ops *ops) |
216 | { |
217 | struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops); |
218 | |
219 | xfrm6_policy_afinfo.garbage_collect(net); |
220 | return dst_entries_get_fast(ops) > ops->gc_thresh * 2; |
221 | } |
222 | |
223 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
224 | struct sk_buff *skb, u32 mtu) |
225 | { |
226 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
227 | struct dst_entry *path = xdst->route; |
228 | |
229 | path->ops->update_pmtu(path, sk, skb, mtu); |
230 | } |
231 | |
232 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
233 | struct sk_buff *skb) |
234 | { |
235 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
236 | struct dst_entry *path = xdst->route; |
237 | |
238 | path->ops->redirect(path, sk, skb); |
239 | } |
240 | |
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); |
247 | dst_destroy_metrics_generic(dst); |
248 | if (rt6_has_peer(&xdst->u.rt6)) { |
249 | struct inet_peer *peer = rt6_peer_ptr(&xdst->u.rt6); |
250 | inet_putpeer(peer); |
251 | } |
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) { |
265 | struct inet6_dev *loopback_idev = |
266 | in6_dev_get(dev_net(dev)->loopback_dev); |
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 | |
282 | static struct dst_ops xfrm6_dst_ops = { |
283 | .family = AF_INET6, |
284 | .protocol = cpu_to_be16(ETH_P_IPV6), |
285 | .gc = xfrm6_garbage_collect, |
286 | .update_pmtu = xfrm6_update_pmtu, |
287 | .redirect = xfrm6_redirect, |
288 | .cow_metrics = dst_cow_metrics_generic, |
289 | .destroy = xfrm6_dst_destroy, |
290 | .ifdown = xfrm6_dst_ifdown, |
291 | .local_out = __ip6_local_out, |
292 | .gc_thresh = 32768, |
293 | }; |
294 | |
295 | static struct xfrm_policy_afinfo xfrm6_policy_afinfo = { |
296 | .family = AF_INET6, |
297 | .dst_ops = &xfrm6_dst_ops, |
298 | .dst_lookup = xfrm6_dst_lookup, |
299 | .get_saddr = xfrm6_get_saddr, |
300 | .decode_session = _decode_session6, |
301 | .get_tos = xfrm6_get_tos, |
302 | .init_dst = xfrm6_init_dst, |
303 | .init_path = xfrm6_init_path, |
304 | .fill_dst = xfrm6_fill_dst, |
305 | .blackhole_route = ip6_blackhole_route, |
306 | }; |
307 | |
308 | static int __init xfrm6_policy_init(void) |
309 | { |
310 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo); |
311 | } |
312 | |
313 | static void xfrm6_policy_fini(void) |
314 | { |
315 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); |
316 | } |
317 | |
318 | #ifdef CONFIG_SYSCTL |
319 | static struct ctl_table xfrm6_policy_table[] = { |
320 | { |
321 | .procname = "xfrm6_gc_thresh", |
322 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
323 | .maxlen = sizeof(int), |
324 | .mode = 0644, |
325 | .proc_handler = proc_dointvec, |
326 | }, |
327 | { } |
328 | }; |
329 | |
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 | }; |
375 | #endif |
376 | |
377 | int __init xfrm6_init(void) |
378 | { |
379 | int ret; |
380 | |
381 | dst_entries_init(&xfrm6_dst_ops); |
382 | |
383 | ret = xfrm6_policy_init(); |
384 | if (ret) { |
385 | dst_entries_destroy(&xfrm6_dst_ops); |
386 | goto out; |
387 | } |
388 | ret = xfrm6_state_init(); |
389 | if (ret) |
390 | goto out_policy; |
391 | |
392 | ret = xfrm6_protocol_init(); |
393 | if (ret) |
394 | goto out_state; |
395 | |
396 | #ifdef CONFIG_SYSCTL |
397 | register_pernet_subsys(&xfrm6_net_ops); |
398 | #endif |
399 | out: |
400 | return ret; |
401 | out_state: |
402 | xfrm6_state_fini(); |
403 | out_policy: |
404 | xfrm6_policy_fini(); |
405 | goto out; |
406 | } |
407 | |
408 | void xfrm6_fini(void) |
409 | { |
410 | #ifdef CONFIG_SYSCTL |
411 | unregister_pernet_subsys(&xfrm6_net_ops); |
412 | #endif |
413 | xfrm6_protocol_fini(); |
414 | xfrm6_policy_fini(); |
415 | xfrm6_state_fini(); |
416 | dst_entries_destroy(&xfrm6_dst_ops); |
417 | } |
418 |
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