1 // SPDX-License-Identifier: GPL-2.0
3 * xfrm6_policy.c: based on xfrm4_policy.c
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
11 * Split up af-specific portion
15 #include <linux/err.h>
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <net/addrconf.h>
23 #include <net/ip6_route.h>
24 #include <net/l3mdev.h>
25 #if IS_ENABLED(CONFIG_IPV6_MIP6)
29 static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
30 const xfrm_address_t *saddr,
31 const xfrm_address_t *daddr,
35 struct dst_entry *dst;
38 memset(&fl6, 0, sizeof(fl6));
39 fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif);
40 fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
41 fl6.flowi6_mark = mark;
42 memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
44 memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
46 dst = ip6_route_output(net, NULL, &fl6);
57 static int xfrm6_get_saddr(struct net *net, int oif,
58 xfrm_address_t *saddr, xfrm_address_t *daddr,
61 struct dst_entry *dst;
62 struct net_device *dev;
64 dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark);
68 dev = ip6_dst_idev(dst)->dev;
69 ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
74 static int xfrm6_get_tos(const struct flowi *fl)
79 static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
82 if (dst->ops->family == AF_INET6) {
83 struct rt6_info *rt = (struct rt6_info *)dst;
84 path->path_cookie = rt6_get_cookie(rt);
87 path->u.rt6.rt6i_nfheader_len = nfheader_len;
92 static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
93 const struct flowi *fl)
95 struct rt6_info *rt = (struct rt6_info *)xdst->route;
97 xdst->u.dst.dev = dev;
100 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
101 if (!xdst->u.rt6.rt6i_idev) {
106 /* Sheit... I remember I did this right. Apparently,
107 * it was magically lost, so this code needs audit */
108 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
110 xdst->route_cookie = rt6_get_cookie(rt);
111 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
112 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
113 xdst->u.rt6.rt6i_src = rt->rt6i_src;
114 INIT_LIST_HEAD(&xdst->u.rt6.rt6i_uncached);
115 rt6_uncached_list_add(&xdst->u.rt6);
116 atomic_inc(&dev_net(dev)->ipv6.rt6_stats->fib_rt_uncache);
122 _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
124 struct flowi6 *fl6 = &fl->u.ip6;
126 const struct ipv6hdr *hdr = ipv6_hdr(skb);
127 u32 offset = sizeof(*hdr);
128 struct ipv6_opt_hdr *exthdr;
129 const unsigned char *nh = skb_network_header(skb);
130 u16 nhoff = IP6CB(skb)->nhoff;
135 nhoff = offsetof(struct ipv6hdr, nexthdr);
140 oif = skb_dst(skb)->dev->ifindex;
142 memset(fl6, 0, sizeof(struct flowi6));
143 fl6->flowi6_mark = skb->mark;
144 fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
146 fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
147 fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
149 while (nh + offset + sizeof(*exthdr) < skb->data ||
150 pskb_may_pull(skb, nh + offset + sizeof(*exthdr) - skb->data)) {
151 nh = skb_network_header(skb);
152 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
155 case NEXTHDR_FRAGMENT:
158 case NEXTHDR_ROUTING:
161 offset += ipv6_optlen(exthdr);
162 nexthdr = exthdr->nexthdr;
163 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
167 case IPPROTO_UDPLITE:
171 if (!onlyproto && (nh + offset + 4 < skb->data ||
172 pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
175 nh = skb_network_header(skb);
176 ports = (__be16 *)(nh + offset);
177 fl6->fl6_sport = ports[!!reverse];
178 fl6->fl6_dport = ports[!reverse];
180 fl6->flowi6_proto = nexthdr;
184 if (!onlyproto && (nh + offset + 2 < skb->data ||
185 pskb_may_pull(skb, nh + offset + 2 - skb->data))) {
188 nh = skb_network_header(skb);
189 icmp = (u8 *)(nh + offset);
190 fl6->fl6_icmp_type = icmp[0];
191 fl6->fl6_icmp_code = icmp[1];
193 fl6->flowi6_proto = nexthdr;
196 #if IS_ENABLED(CONFIG_IPV6_MIP6)
198 offset += ipv6_optlen(exthdr);
199 if (!onlyproto && (nh + offset + 3 < skb->data ||
200 pskb_may_pull(skb, nh + offset + 3 - skb->data))) {
203 nh = skb_network_header(skb);
204 mh = (struct ip6_mh *)(nh + offset);
205 fl6->fl6_mh_type = mh->ip6mh_type;
207 fl6->flowi6_proto = nexthdr;
211 /* XXX Why are there these headers? */
216 fl6->fl6_ipsec_spi = 0;
217 fl6->flowi6_proto = nexthdr;
223 static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
224 struct sk_buff *skb, u32 mtu,
227 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
228 struct dst_entry *path = xdst->route;
230 path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh);
233 static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
236 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
237 struct dst_entry *path = xdst->route;
239 path->ops->redirect(path, sk, skb);
242 static void xfrm6_dst_destroy(struct dst_entry *dst)
244 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
246 if (likely(xdst->u.rt6.rt6i_idev))
247 in6_dev_put(xdst->u.rt6.rt6i_idev);
248 dst_destroy_metrics_generic(dst);
249 if (xdst->u.rt6.rt6i_uncached_list)
250 rt6_uncached_list_del(&xdst->u.rt6);
251 xfrm_dst_destroy(xdst);
254 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
257 struct xfrm_dst *xdst;
262 xdst = (struct xfrm_dst *)dst;
263 if (xdst->u.rt6.rt6i_idev->dev == dev) {
264 struct inet6_dev *loopback_idev =
265 in6_dev_get(dev_net(dev)->loopback_dev);
266 BUG_ON(!loopback_idev);
269 in6_dev_put(xdst->u.rt6.rt6i_idev);
270 xdst->u.rt6.rt6i_idev = loopback_idev;
271 in6_dev_hold(loopback_idev);
272 xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst);
273 } while (xdst->u.dst.xfrm);
275 __in6_dev_put(loopback_idev);
278 xfrm_dst_ifdown(dst, dev);
281 static struct dst_ops xfrm6_dst_ops_template = {
283 .update_pmtu = xfrm6_update_pmtu,
284 .redirect = xfrm6_redirect,
285 .cow_metrics = dst_cow_metrics_generic,
286 .destroy = xfrm6_dst_destroy,
287 .ifdown = xfrm6_dst_ifdown,
288 .local_out = __ip6_local_out,
292 static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
293 .dst_ops = &xfrm6_dst_ops_template,
294 .dst_lookup = xfrm6_dst_lookup,
295 .get_saddr = xfrm6_get_saddr,
296 .decode_session = _decode_session6,
297 .get_tos = xfrm6_get_tos,
298 .init_path = xfrm6_init_path,
299 .fill_dst = xfrm6_fill_dst,
300 .blackhole_route = ip6_blackhole_route,
303 static int __init xfrm6_policy_init(void)
305 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6);
308 static void xfrm6_policy_fini(void)
310 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
314 static struct ctl_table xfrm6_policy_table[] = {
316 .procname = "xfrm6_gc_thresh",
317 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
318 .maxlen = sizeof(int),
320 .proc_handler = proc_dointvec,
325 static int __net_init xfrm6_net_sysctl_init(struct net *net)
327 struct ctl_table *table;
328 struct ctl_table_header *hdr;
330 table = xfrm6_policy_table;
331 if (!net_eq(net, &init_net)) {
332 table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
336 table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
339 hdr = register_net_sysctl(net, "net/ipv6", table);
343 net->ipv6.sysctl.xfrm6_hdr = hdr;
347 if (!net_eq(net, &init_net))
353 static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
355 struct ctl_table *table;
357 if (!net->ipv6.sysctl.xfrm6_hdr)
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))
365 #else /* CONFIG_SYSCTL */
366 static inline int xfrm6_net_sysctl_init(struct net *net)
371 static inline void xfrm6_net_sysctl_exit(struct net *net)
376 static int __net_init xfrm6_net_init(struct net *net)
380 memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
381 sizeof(xfrm6_dst_ops_template));
382 ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
386 ret = xfrm6_net_sysctl_init(net);
388 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
393 static void __net_exit xfrm6_net_exit(struct net *net)
395 xfrm6_net_sysctl_exit(net);
396 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
399 static struct pernet_operations xfrm6_net_ops = {
400 .init = xfrm6_net_init,
401 .exit = xfrm6_net_exit,
404 int __init xfrm6_init(void)
408 ret = xfrm6_policy_init();
411 ret = xfrm6_state_init();
415 ret = xfrm6_protocol_init();
419 register_pernet_subsys(&xfrm6_net_ops);
429 void xfrm6_fini(void)
431 unregister_pernet_subsys(&xfrm6_net_ops);
432 xfrm6_protocol_fini();