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->u.rt6.rt6i_metric = rt->rt6i_metric;
111 xdst->u.rt6.rt6i_node = rt->rt6i_node;
112 xdst->route_cookie = rt6_get_cookie(rt);
113 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
114 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
115 xdst->u.rt6.rt6i_src = rt->rt6i_src;
121 _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
123 struct flowi6 *fl6 = &fl->u.ip6;
125 const struct ipv6hdr *hdr = ipv6_hdr(skb);
126 u16 offset = sizeof(*hdr);
127 struct ipv6_opt_hdr *exthdr;
128 const unsigned char *nh = skb_network_header(skb);
129 u16 nhoff = IP6CB(skb)->nhoff;
134 nhoff = offsetof(struct ipv6hdr, nexthdr);
139 oif = skb_dst(skb)->dev->ifindex;
141 memset(fl6, 0, sizeof(struct flowi6));
142 fl6->flowi6_mark = skb->mark;
143 fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
145 fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
146 fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
148 while (nh + offset + 1 < skb->data ||
149 pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
150 nh = skb_network_header(skb);
151 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
154 case NEXTHDR_FRAGMENT:
157 case NEXTHDR_ROUTING:
160 offset += ipv6_optlen(exthdr);
161 nexthdr = exthdr->nexthdr;
162 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
166 case IPPROTO_UDPLITE:
170 if (!onlyproto && (nh + offset + 4 < skb->data ||
171 pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
174 nh = skb_network_header(skb);
175 ports = (__be16 *)(nh + offset);
176 fl6->fl6_sport = ports[!!reverse];
177 fl6->fl6_dport = ports[!reverse];
179 fl6->flowi6_proto = nexthdr;
183 if (!onlyproto && (nh + offset + 2 < skb->data ||
184 pskb_may_pull(skb, nh + offset + 2 - skb->data))) {
187 nh = skb_network_header(skb);
188 icmp = (u8 *)(nh + offset);
189 fl6->fl6_icmp_type = icmp[0];
190 fl6->fl6_icmp_code = icmp[1];
192 fl6->flowi6_proto = nexthdr;
195 #if IS_ENABLED(CONFIG_IPV6_MIP6)
197 offset += ipv6_optlen(exthdr);
198 if (!onlyproto && (nh + offset + 3 < skb->data ||
199 pskb_may_pull(skb, nh + offset + 3 - skb->data))) {
202 nh = skb_network_header(skb);
203 mh = (struct ip6_mh *)(nh + offset);
204 fl6->fl6_mh_type = mh->ip6mh_type;
206 fl6->flowi6_proto = nexthdr;
210 /* XXX Why are there these headers? */
215 fl6->fl6_ipsec_spi = 0;
216 fl6->flowi6_proto = nexthdr;
222 static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
223 struct sk_buff *skb, u32 mtu)
225 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
226 struct dst_entry *path = xdst->route;
228 path->ops->update_pmtu(path, sk, skb, mtu);
231 static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
234 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
235 struct dst_entry *path = xdst->route;
237 path->ops->redirect(path, sk, skb);
240 static void xfrm6_dst_destroy(struct dst_entry *dst)
242 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
244 if (likely(xdst->u.rt6.rt6i_idev))
245 in6_dev_put(xdst->u.rt6.rt6i_idev);
246 dst_destroy_metrics_generic(dst);
247 xfrm_dst_destroy(xdst);
250 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
253 struct xfrm_dst *xdst;
258 xdst = (struct xfrm_dst *)dst;
259 if (xdst->u.rt6.rt6i_idev->dev == dev) {
260 struct inet6_dev *loopback_idev =
261 in6_dev_get(dev_net(dev)->loopback_dev);
262 BUG_ON(!loopback_idev);
265 in6_dev_put(xdst->u.rt6.rt6i_idev);
266 xdst->u.rt6.rt6i_idev = loopback_idev;
267 in6_dev_hold(loopback_idev);
268 xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst);
269 } while (xdst->u.dst.xfrm);
271 __in6_dev_put(loopback_idev);
274 xfrm_dst_ifdown(dst, dev);
277 static struct dst_ops xfrm6_dst_ops_template = {
279 .update_pmtu = xfrm6_update_pmtu,
280 .redirect = xfrm6_redirect,
281 .cow_metrics = dst_cow_metrics_generic,
282 .destroy = xfrm6_dst_destroy,
283 .ifdown = xfrm6_dst_ifdown,
284 .local_out = __ip6_local_out,
288 static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
289 .dst_ops = &xfrm6_dst_ops_template,
290 .dst_lookup = xfrm6_dst_lookup,
291 .get_saddr = xfrm6_get_saddr,
292 .decode_session = _decode_session6,
293 .get_tos = xfrm6_get_tos,
294 .init_path = xfrm6_init_path,
295 .fill_dst = xfrm6_fill_dst,
296 .blackhole_route = ip6_blackhole_route,
299 static int __init xfrm6_policy_init(void)
301 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6);
304 static void xfrm6_policy_fini(void)
306 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
310 static struct ctl_table xfrm6_policy_table[] = {
312 .procname = "xfrm6_gc_thresh",
313 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
314 .maxlen = sizeof(int),
316 .proc_handler = proc_dointvec,
321 static int __net_init xfrm6_net_sysctl_init(struct net *net)
323 struct ctl_table *table;
324 struct ctl_table_header *hdr;
326 table = xfrm6_policy_table;
327 if (!net_eq(net, &init_net)) {
328 table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
332 table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
335 hdr = register_net_sysctl(net, "net/ipv6", table);
339 net->ipv6.sysctl.xfrm6_hdr = hdr;
343 if (!net_eq(net, &init_net))
349 static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
351 struct ctl_table *table;
353 if (!net->ipv6.sysctl.xfrm6_hdr)
356 table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
357 unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
358 if (!net_eq(net, &init_net))
361 #else /* CONFIG_SYSCTL */
362 static inline int xfrm6_net_sysctl_init(struct net *net)
367 static inline void xfrm6_net_sysctl_exit(struct net *net)
372 static int __net_init xfrm6_net_init(struct net *net)
376 memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
377 sizeof(xfrm6_dst_ops_template));
378 ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
382 ret = xfrm6_net_sysctl_init(net);
384 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
389 static void __net_exit xfrm6_net_exit(struct net *net)
391 xfrm6_net_sysctl_exit(net);
392 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
395 static struct pernet_operations xfrm6_net_ops = {
396 .init = xfrm6_net_init,
397 .exit = xfrm6_net_exit,
400 int __init xfrm6_init(void)
404 ret = xfrm6_policy_init();
407 ret = xfrm6_state_init();
411 ret = xfrm6_protocol_init();
415 register_pernet_subsys(&xfrm6_net_ops);
425 void xfrm6_fini(void)
427 unregister_pernet_subsys(&xfrm6_net_ops);
428 xfrm6_protocol_fini();