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>
26 static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
27 const xfrm_address_t *saddr,
28 const xfrm_address_t *daddr,
32 struct dst_entry *dst;
35 memset(&fl6, 0, sizeof(fl6));
36 fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif);
37 fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
38 fl6.flowi6_mark = mark;
39 memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
41 memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
43 dst = ip6_route_output(net, NULL, &fl6);
54 static int xfrm6_get_saddr(struct net *net, int oif,
55 xfrm_address_t *saddr, xfrm_address_t *daddr,
58 struct dst_entry *dst;
59 struct net_device *dev;
61 dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark);
65 dev = ip6_dst_idev(dst)->dev;
66 ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
71 static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
72 const struct flowi *fl)
74 struct rt6_info *rt = (struct rt6_info *)xdst->route;
76 xdst->u.dst.dev = dev;
79 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
80 if (!xdst->u.rt6.rt6i_idev) {
85 /* Sheit... I remember I did this right. Apparently,
86 * it was magically lost, so this code needs audit */
87 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
89 xdst->route_cookie = rt6_get_cookie(rt);
90 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
91 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
92 xdst->u.rt6.rt6i_src = rt->rt6i_src;
93 INIT_LIST_HEAD(&xdst->u.rt6.rt6i_uncached);
94 rt6_uncached_list_add(&xdst->u.rt6);
95 atomic_inc(&dev_net(dev)->ipv6.rt6_stats->fib_rt_uncache);
100 static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
101 struct sk_buff *skb, u32 mtu,
104 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
105 struct dst_entry *path = xdst->route;
107 path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh);
110 static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
113 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
114 struct dst_entry *path = xdst->route;
116 path->ops->redirect(path, sk, skb);
119 static void xfrm6_dst_destroy(struct dst_entry *dst)
121 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
123 if (likely(xdst->u.rt6.rt6i_idev))
124 in6_dev_put(xdst->u.rt6.rt6i_idev);
125 dst_destroy_metrics_generic(dst);
126 if (xdst->u.rt6.rt6i_uncached_list)
127 rt6_uncached_list_del(&xdst->u.rt6);
128 xfrm_dst_destroy(xdst);
131 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
134 struct xfrm_dst *xdst;
139 xdst = (struct xfrm_dst *)dst;
140 if (xdst->u.rt6.rt6i_idev->dev == dev) {
141 struct inet6_dev *loopback_idev =
142 in6_dev_get(dev_net(dev)->loopback_dev);
145 in6_dev_put(xdst->u.rt6.rt6i_idev);
146 xdst->u.rt6.rt6i_idev = loopback_idev;
147 in6_dev_hold(loopback_idev);
148 xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst);
149 } while (xdst->u.dst.xfrm);
151 __in6_dev_put(loopback_idev);
154 xfrm_dst_ifdown(dst, dev);
157 static struct dst_ops xfrm6_dst_ops_template = {
159 .update_pmtu = xfrm6_update_pmtu,
160 .redirect = xfrm6_redirect,
161 .cow_metrics = dst_cow_metrics_generic,
162 .destroy = xfrm6_dst_destroy,
163 .ifdown = xfrm6_dst_ifdown,
164 .local_out = __ip6_local_out,
168 static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
169 .dst_ops = &xfrm6_dst_ops_template,
170 .dst_lookup = xfrm6_dst_lookup,
171 .get_saddr = xfrm6_get_saddr,
172 .fill_dst = xfrm6_fill_dst,
173 .blackhole_route = ip6_blackhole_route,
176 static int __init xfrm6_policy_init(void)
178 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6);
181 static void xfrm6_policy_fini(void)
183 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
187 static struct ctl_table xfrm6_policy_table[] = {
189 .procname = "xfrm6_gc_thresh",
190 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
191 .maxlen = sizeof(int),
193 .proc_handler = proc_dointvec,
198 static int __net_init xfrm6_net_sysctl_init(struct net *net)
200 struct ctl_table *table;
201 struct ctl_table_header *hdr;
203 table = xfrm6_policy_table;
204 if (!net_eq(net, &init_net)) {
205 table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
209 table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
212 hdr = register_net_sysctl(net, "net/ipv6", table);
216 net->ipv6.sysctl.xfrm6_hdr = hdr;
220 if (!net_eq(net, &init_net))
226 static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
228 struct ctl_table *table;
230 if (!net->ipv6.sysctl.xfrm6_hdr)
233 table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
234 unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
235 if (!net_eq(net, &init_net))
238 #else /* CONFIG_SYSCTL */
239 static inline int xfrm6_net_sysctl_init(struct net *net)
244 static inline void xfrm6_net_sysctl_exit(struct net *net)
249 static int __net_init xfrm6_net_init(struct net *net)
253 memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
254 sizeof(xfrm6_dst_ops_template));
255 ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
259 ret = xfrm6_net_sysctl_init(net);
261 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
266 static void __net_exit xfrm6_net_exit(struct net *net)
268 xfrm6_net_sysctl_exit(net);
269 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
272 static struct pernet_operations xfrm6_net_ops = {
273 .init = xfrm6_net_init,
274 .exit = xfrm6_net_exit,
277 int __init xfrm6_init(void)
281 ret = xfrm6_policy_init();
284 ret = xfrm6_state_init();
288 ret = xfrm6_protocol_init();
292 ret = register_pernet_subsys(&xfrm6_net_ops);
298 xfrm6_protocol_fini();
306 void xfrm6_fini(void)
308 unregister_pernet_subsys(&xfrm6_net_ops);
309 xfrm6_protocol_fini();