2 * xfrm6_policy.c: based on xfrm4_policy.c
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * Split up af-specific portion
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <net/addrconf.h>
22 #include <net/ip6_route.h>
23 #if IS_ENABLED(CONFIG_IPV6_MIP6)
27 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
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)
34 struct dst_entry *dst;
37 memset(&fl6, 0, sizeof(fl6));
38 memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
40 memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
42 dst = ip6_route_output(net, NULL, &fl6);
53 static int xfrm6_get_saddr(struct net *net,
54 xfrm_address_t *saddr, xfrm_address_t *daddr)
56 struct dst_entry *dst;
57 struct net_device *dev;
59 dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
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);
71 static int xfrm6_get_tos(const struct flowi *fl)
76 static void xfrm6_init_dst(struct net *net, struct xfrm_dst *xdst)
78 struct rt6_info *rt = (struct rt6_info *)xdst;
80 rt6_init_peer(rt, net->ipv6.peers);
83 static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
86 if (dst->ops->family == AF_INET6) {
87 struct rt6_info *rt = (struct rt6_info*)dst;
89 path->path_cookie = rt->rt6i_node->fn_sernum;
92 path->u.rt6.rt6i_nfheader_len = nfheader_len;
97 static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
98 const struct flowi *fl)
100 struct rt6_info *rt = (struct rt6_info*)xdst->route;
102 xdst->u.dst.dev = dev;
105 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
106 if (!xdst->u.rt6.rt6i_idev)
109 rt6_transfer_peer(&xdst->u.rt6, rt);
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 |
115 xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
116 xdst->u.rt6.rt6i_node = rt->rt6i_node;
118 xdst->route_cookie = rt->rt6i_node->fn_sernum;
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;
127 _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
129 struct flowi6 *fl6 = &fl->u.ip6;
131 u16 offset = skb_network_header_len(skb);
132 const struct ipv6hdr *hdr = ipv6_hdr(skb);
133 struct ipv6_opt_hdr *exthdr;
134 const unsigned char *nh = skb_network_header(skb);
135 u8 nexthdr = nh[IP6CB(skb)->nhoff];
137 memset(fl6, 0, sizeof(struct flowi6));
138 fl6->flowi6_mark = skb->mark;
140 fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
141 fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
143 while (nh + offset + 1 < skb->data ||
144 pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
145 nh = skb_network_header(skb);
146 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
149 case NEXTHDR_FRAGMENT:
151 case NEXTHDR_ROUTING:
154 offset += ipv6_optlen(exthdr);
155 nexthdr = exthdr->nexthdr;
156 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
160 case IPPROTO_UDPLITE:
164 if (!onlyproto && (nh + offset + 4 < skb->data ||
165 pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
166 __be16 *ports = (__be16 *)exthdr;
168 fl6->fl6_sport = ports[!!reverse];
169 fl6->fl6_dport = ports[!reverse];
171 fl6->flowi6_proto = nexthdr;
175 if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
176 u8 *icmp = (u8 *)exthdr;
178 fl6->fl6_icmp_type = icmp[0];
179 fl6->fl6_icmp_code = icmp[1];
181 fl6->flowi6_proto = nexthdr;
184 #if IS_ENABLED(CONFIG_IPV6_MIP6)
186 if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
188 mh = (struct ip6_mh *)exthdr;
190 fl6->fl6_mh_type = mh->ip6mh_type;
192 fl6->flowi6_proto = nexthdr;
196 /* XXX Why are there these headers? */
201 fl6->fl6_ipsec_spi = 0;
202 fl6->flowi6_proto = nexthdr;
208 static inline int xfrm6_garbage_collect(struct dst_ops *ops)
210 struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
212 xfrm6_policy_afinfo.garbage_collect(net);
213 return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
216 static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
217 struct sk_buff *skb, u32 mtu)
219 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
220 struct dst_entry *path = xdst->route;
222 path->ops->update_pmtu(path, sk, skb, mtu);
225 static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
228 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
229 struct dst_entry *path = xdst->route;
231 path->ops->redirect(path, sk, skb);
234 static void xfrm6_dst_destroy(struct dst_entry *dst)
236 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
238 if (likely(xdst->u.rt6.rt6i_idev))
239 in6_dev_put(xdst->u.rt6.rt6i_idev);
240 dst_destroy_metrics_generic(dst);
241 if (rt6_has_peer(&xdst->u.rt6)) {
242 struct inet_peer *peer = rt6_peer_ptr(&xdst->u.rt6);
245 xfrm_dst_destroy(xdst);
248 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
251 struct xfrm_dst *xdst;
256 xdst = (struct xfrm_dst *)dst;
257 if (xdst->u.rt6.rt6i_idev->dev == dev) {
258 struct inet6_dev *loopback_idev =
259 in6_dev_get(dev_net(dev)->loopback_dev);
260 BUG_ON(!loopback_idev);
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);
269 __in6_dev_put(loopback_idev);
272 xfrm_dst_ifdown(dst, dev);
275 static struct dst_ops xfrm6_dst_ops = {
277 .protocol = cpu_to_be16(ETH_P_IPV6),
278 .gc = xfrm6_garbage_collect,
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 struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
290 .dst_ops = &xfrm6_dst_ops,
291 .dst_lookup = xfrm6_dst_lookup,
292 .get_saddr = xfrm6_get_saddr,
293 .decode_session = _decode_session6,
294 .get_tos = xfrm6_get_tos,
295 .init_dst = xfrm6_init_dst,
296 .init_path = xfrm6_init_path,
297 .fill_dst = xfrm6_fill_dst,
298 .blackhole_route = ip6_blackhole_route,
301 static int __init xfrm6_policy_init(void)
303 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
306 static void xfrm6_policy_fini(void)
308 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
312 static struct ctl_table xfrm6_policy_table[] = {
314 .procname = "xfrm6_gc_thresh",
315 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
316 .maxlen = sizeof(int),
318 .proc_handler = proc_dointvec,
323 static int __net_init xfrm6_net_init(struct net *net)
325 struct ctl_table *table;
326 struct ctl_table_header *hdr;
328 table = xfrm6_policy_table;
329 if (!net_eq(net, &init_net)) {
330 table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
334 table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
337 hdr = register_net_sysctl(net, "net/ipv6", table);
341 net->ipv6.sysctl.xfrm6_hdr = hdr;
345 if (!net_eq(net, &init_net))
351 static void __net_exit xfrm6_net_exit(struct net *net)
353 struct ctl_table *table;
355 if (net->ipv6.sysctl.xfrm6_hdr == NULL)
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))
364 static struct pernet_operations xfrm6_net_ops = {
365 .init = xfrm6_net_init,
366 .exit = xfrm6_net_exit,
370 int __init xfrm6_init(void)
374 dst_entries_init(&xfrm6_dst_ops);
376 ret = xfrm6_policy_init();
378 dst_entries_destroy(&xfrm6_dst_ops);
381 ret = xfrm6_state_init();
386 register_pernet_subsys(&xfrm6_net_ops);
395 void xfrm6_fini(void)
398 unregister_pernet_subsys(&xfrm6_net_ops);
402 dst_entries_destroy(&xfrm6_dst_ops);