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15#include <linux/err.h>
16#include <linux/kernel.h>
17#include <linux/netdevice.h>
18#include <net/addrconf.h>
19#include <net/dst.h>
20#include <net/xfrm.h>
21#include <net/ip.h>
22#include <net/ipv6.h>
23#include <net/ip6_route.h>
24#include <net/l3mdev.h>
25
26static 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,
29 u32 mark)
30{
31 struct flowi6 fl6;
32 struct dst_entry *dst;
33 int err;
34
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));
40 if (saddr)
41 memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
42
43 dst = ip6_route_output(net, NULL, &fl6);
44
45 err = dst->error;
46 if (dst->error) {
47 dst_release(dst);
48 dst = ERR_PTR(err);
49 }
50
51 return dst;
52}
53
54static int xfrm6_get_saddr(struct net *net, int oif,
55 xfrm_address_t *saddr, xfrm_address_t *daddr,
56 u32 mark)
57{
58 struct dst_entry *dst;
59 struct net_device *dev;
60
61 dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark);
62 if (IS_ERR(dst))
63 return -EHOSTUNREACH;
64
65 dev = ip6_dst_idev(dst)->dev;
66 ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
67 dst_release(dst);
68 return 0;
69}
70
71static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
72 const struct flowi *fl)
73{
74 struct rt6_info *rt = (struct rt6_info *)xdst->route;
75
76 xdst->u.dst.dev = dev;
77 dev_hold(dev);
78
79 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
80 if (!xdst->u.rt6.rt6i_idev) {
81 dev_put(dev);
82 return -ENODEV;
83 }
84
85
86
87 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
88 RTF_LOCAL);
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);
96
97 return 0;
98}
99
100static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
101 struct sk_buff *skb, u32 mtu)
102{
103 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
104 struct dst_entry *path = xdst->route;
105
106 path->ops->update_pmtu(path, sk, skb, mtu);
107}
108
109static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
110 struct sk_buff *skb)
111{
112 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
113 struct dst_entry *path = xdst->route;
114
115 path->ops->redirect(path, sk, skb);
116}
117
118static void xfrm6_dst_destroy(struct dst_entry *dst)
119{
120 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
121
122 if (likely(xdst->u.rt6.rt6i_idev))
123 in6_dev_put(xdst->u.rt6.rt6i_idev);
124 dst_destroy_metrics_generic(dst);
125 if (xdst->u.rt6.rt6i_uncached_list)
126 rt6_uncached_list_del(&xdst->u.rt6);
127 xfrm_dst_destroy(xdst);
128}
129
130static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
131 int unregister)
132{
133 struct xfrm_dst *xdst;
134
135 if (!unregister)
136 return;
137
138 xdst = (struct xfrm_dst *)dst;
139 if (xdst->u.rt6.rt6i_idev->dev == dev) {
140 struct inet6_dev *loopback_idev =
141 in6_dev_get(dev_net(dev)->loopback_dev);
142
143 do {
144 in6_dev_put(xdst->u.rt6.rt6i_idev);
145 xdst->u.rt6.rt6i_idev = loopback_idev;
146 in6_dev_hold(loopback_idev);
147 xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst);
148 } while (xdst->u.dst.xfrm);
149
150 __in6_dev_put(loopback_idev);
151 }
152
153 xfrm_dst_ifdown(dst, dev);
154}
155
156static struct dst_ops xfrm6_dst_ops_template = {
157 .family = AF_INET6,
158 .update_pmtu = xfrm6_update_pmtu,
159 .redirect = xfrm6_redirect,
160 .cow_metrics = dst_cow_metrics_generic,
161 .destroy = xfrm6_dst_destroy,
162 .ifdown = xfrm6_dst_ifdown,
163 .local_out = __ip6_local_out,
164 .gc_thresh = 32768,
165};
166
167static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
168 .dst_ops = &xfrm6_dst_ops_template,
169 .dst_lookup = xfrm6_dst_lookup,
170 .get_saddr = xfrm6_get_saddr,
171 .fill_dst = xfrm6_fill_dst,
172 .blackhole_route = ip6_blackhole_route,
173};
174
175static int __init xfrm6_policy_init(void)
176{
177 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6);
178}
179
180static void xfrm6_policy_fini(void)
181{
182 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
183}
184
185#ifdef CONFIG_SYSCTL
186static struct ctl_table xfrm6_policy_table[] = {
187 {
188 .procname = "xfrm6_gc_thresh",
189 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
190 .maxlen = sizeof(int),
191 .mode = 0644,
192 .proc_handler = proc_dointvec,
193 },
194 { }
195};
196
197static int __net_init xfrm6_net_sysctl_init(struct net *net)
198{
199 struct ctl_table *table;
200 struct ctl_table_header *hdr;
201
202 table = xfrm6_policy_table;
203 if (!net_eq(net, &init_net)) {
204 table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
205 if (!table)
206 goto err_alloc;
207
208 table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
209 }
210
211 hdr = register_net_sysctl(net, "net/ipv6", table);
212 if (!hdr)
213 goto err_reg;
214
215 net->ipv6.sysctl.xfrm6_hdr = hdr;
216 return 0;
217
218err_reg:
219 if (!net_eq(net, &init_net))
220 kfree(table);
221err_alloc:
222 return -ENOMEM;
223}
224
225static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
226{
227 struct ctl_table *table;
228
229 if (!net->ipv6.sysctl.xfrm6_hdr)
230 return;
231
232 table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
233 unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
234 if (!net_eq(net, &init_net))
235 kfree(table);
236}
237#else
238static inline int xfrm6_net_sysctl_init(struct net *net)
239{
240 return 0;
241}
242
243static inline void xfrm6_net_sysctl_exit(struct net *net)
244{
245}
246#endif
247
248static int __net_init xfrm6_net_init(struct net *net)
249{
250 int ret;
251
252 memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
253 sizeof(xfrm6_dst_ops_template));
254 ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
255 if (ret)
256 return ret;
257
258 ret = xfrm6_net_sysctl_init(net);
259 if (ret)
260 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
261
262 return ret;
263}
264
265static void __net_exit xfrm6_net_exit(struct net *net)
266{
267 xfrm6_net_sysctl_exit(net);
268 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
269}
270
271static struct pernet_operations xfrm6_net_ops = {
272 .init = xfrm6_net_init,
273 .exit = xfrm6_net_exit,
274};
275
276int __init xfrm6_init(void)
277{
278 int ret;
279
280 ret = xfrm6_policy_init();
281 if (ret)
282 goto out;
283 ret = xfrm6_state_init();
284 if (ret)
285 goto out_policy;
286
287 ret = xfrm6_protocol_init();
288 if (ret)
289 goto out_state;
290
291 register_pernet_subsys(&xfrm6_net_ops);
292out:
293 return ret;
294out_state:
295 xfrm6_state_fini();
296out_policy:
297 xfrm6_policy_fini();
298 goto out;
299}
300
301void xfrm6_fini(void)
302{
303 unregister_pernet_subsys(&xfrm6_net_ops);
304 xfrm6_protocol_fini();
305 xfrm6_policy_fini();
306 xfrm6_state_fini();
307}
308
