Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * xfrm6_policy.c: based on xfrm4_policy.c | |
4 | * | |
5 | * Authors: | |
6 | * Mitsuru KANDA @USAGI | |
67ba4152 IM |
7 | * Kazunori MIYAZAWA @USAGI |
8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
9 | * IPv6 support | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
1ab1457c | 12 | * |
1da177e4 LT |
13 | */ |
14 | ||
66cdb3ca HX |
15 | #include <linux/err.h> |
16 | #include <linux/kernel.h> | |
aabc9761 HX |
17 | #include <linux/netdevice.h> |
18 | #include <net/addrconf.h> | |
45ff5a3f | 19 | #include <net/dst.h> |
1da177e4 LT |
20 | #include <net/xfrm.h> |
21 | #include <net/ip.h> | |
22 | #include <net/ipv6.h> | |
23 | #include <net/ip6_route.h> | |
385add90 | 24 | #include <net/l3mdev.h> |
1da177e4 | 25 | |
42a7b32b | 26 | static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif, |
5e6b930f | 27 | const xfrm_address_t *saddr, |
077fbac4 LC |
28 | const xfrm_address_t *daddr, |
29 | u32 mark) | |
1da177e4 | 30 | { |
7e1dc7b6 | 31 | struct flowi6 fl6; |
66cdb3ca HX |
32 | struct dst_entry *dst; |
33 | int err; | |
34 | ||
7e1dc7b6 | 35 | memset(&fl6, 0, sizeof(fl6)); |
11d7a0bb | 36 | fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif); |
4148987a | 37 | fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF; |
077fbac4 | 38 | fl6.flowi6_mark = mark; |
7e1dc7b6 | 39 | memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr)); |
66cdb3ca | 40 | if (saddr) |
7e1dc7b6 | 41 | memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr)); |
66cdb3ca | 42 | |
4c9483b2 | 43 | dst = ip6_route_output(net, NULL, &fl6); |
66cdb3ca HX |
44 | |
45 | err = dst->error; | |
46 | if (dst->error) { | |
4251320f | 47 | dst_release(dst); |
66cdb3ca HX |
48 | dst = ERR_PTR(err); |
49 | } | |
50 | ||
51 | return dst; | |
1da177e4 LT |
52 | } |
53 | ||
42a7b32b | 54 | static int xfrm6_get_saddr(struct net *net, int oif, |
077fbac4 LC |
55 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
56 | u32 mark) | |
a1e59abf | 57 | { |
66cdb3ca | 58 | struct dst_entry *dst; |
191cd582 | 59 | struct net_device *dev; |
66cdb3ca | 60 | |
077fbac4 | 61 | dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark); |
66cdb3ca HX |
62 | if (IS_ERR(dst)) |
63 | return -EHOSTUNREACH; | |
64 | ||
191cd582 | 65 | dev = ip6_dst_idev(dst)->dev; |
15e318bd | 66 | ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6); |
66cdb3ca HX |
67 | dst_release(dst); |
68 | return 0; | |
a1e59abf PM |
69 | } |
70 | ||
87c1e12b | 71 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 72 | const struct flowi *fl) |
25ee3286 | 73 | { |
67ba4152 | 74 | struct rt6_info *rt = (struct rt6_info *)xdst->route; |
1da177e4 | 75 | |
25ee3286 HX |
76 | xdst->u.dst.dev = dev; |
77 | dev_hold(dev); | |
1da177e4 | 78 | |
bc8e4b95 | 79 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
84c4a9df CW |
80 | if (!xdst->u.rt6.rt6i_idev) { |
81 | dev_put(dev); | |
25ee3286 | 82 | return -ENODEV; |
84c4a9df | 83 | } |
1da177e4 | 84 | |
25ee3286 HX |
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 | | |
88 | RTF_LOCAL); | |
b197df4f | 89 | xdst->route_cookie = rt6_get_cookie(rt); |
25ee3286 HX |
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; | |
510c321b XL |
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); | |
1da177e4 | 96 | |
1da177e4 | 97 | return 0; |
1da177e4 LT |
98 | } |
99 | ||
6700c270 | 100 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
101 | struct sk_buff *skb, u32 mtu, |
102 | bool confirm_neigh) | |
1da177e4 LT |
103 | { |
104 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
105 | struct dst_entry *path = xdst->route; | |
106 | ||
bd085ef6 | 107 | path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh); |
1da177e4 LT |
108 | } |
109 | ||
6700c270 DM |
110 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
111 | struct sk_buff *skb) | |
ec18d9a2 DM |
112 | { |
113 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
114 | struct dst_entry *path = xdst->route; | |
115 | ||
6700c270 | 116 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
117 | } |
118 | ||
aabc9761 HX |
119 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
120 | { | |
121 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
122 | ||
123 | if (likely(xdst->u.rt6.rt6i_idev)) | |
124 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
62fa8a84 | 125 | dst_destroy_metrics_generic(dst); |
510c321b XL |
126 | if (xdst->u.rt6.rt6i_uncached_list) |
127 | rt6_uncached_list_del(&xdst->u.rt6); | |
aabc9761 HX |
128 | xfrm_dst_destroy(xdst); |
129 | } | |
130 | ||
131 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
132 | int unregister) | |
133 | { | |
134 | struct xfrm_dst *xdst; | |
135 | ||
136 | if (!unregister) | |
137 | return; | |
138 | ||
139 | xdst = (struct xfrm_dst *)dst; | |
140 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 141 | struct inet6_dev *loopback_idev = |
c346dca1 | 142 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
143 | |
144 | do { | |
145 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
146 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
147 | in6_dev_hold(loopback_idev); | |
b92cf4aa | 148 | xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst); |
aabc9761 HX |
149 | } while (xdst->u.dst.xfrm); |
150 | ||
151 | __in6_dev_put(loopback_idev); | |
152 | } | |
153 | ||
154 | xfrm_dst_ifdown(dst, dev); | |
155 | } | |
156 | ||
a8a572a6 | 157 | static struct dst_ops xfrm6_dst_ops_template = { |
1da177e4 | 158 | .family = AF_INET6, |
1da177e4 | 159 | .update_pmtu = xfrm6_update_pmtu, |
ec18d9a2 | 160 | .redirect = xfrm6_redirect, |
62fa8a84 | 161 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 HX |
162 | .destroy = xfrm6_dst_destroy, |
163 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 164 | .local_out = __ip6_local_out, |
3c2a89dd | 165 | .gc_thresh = 32768, |
1da177e4 LT |
166 | }; |
167 | ||
37b10383 | 168 | static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = { |
a8a572a6 | 169 | .dst_ops = &xfrm6_dst_ops_template, |
1da177e4 | 170 | .dst_lookup = xfrm6_dst_lookup, |
67ba4152 | 171 | .get_saddr = xfrm6_get_saddr, |
25ee3286 | 172 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 173 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
174 | }; |
175 | ||
0013caba | 176 | static int __init xfrm6_policy_init(void) |
1da177e4 | 177 | { |
a2817d8b | 178 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6); |
1da177e4 LT |
179 | } |
180 | ||
181 | static void xfrm6_policy_fini(void) | |
182 | { | |
183 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
184 | } | |
185 | ||
db71789c | 186 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
187 | static struct ctl_table xfrm6_policy_table[] = { |
188 | { | |
a44a4a00 | 189 | .procname = "xfrm6_gc_thresh", |
67ba4152 IM |
190 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
191 | .maxlen = sizeof(int), | |
192 | .mode = 0644, | |
a44a4a00 NH |
193 | .proc_handler = proc_dointvec, |
194 | }, | |
195 | { } | |
196 | }; | |
197 | ||
a8a572a6 | 198 | static int __net_init xfrm6_net_sysctl_init(struct net *net) |
8d068875 MK |
199 | { |
200 | struct ctl_table *table; | |
201 | struct ctl_table_header *hdr; | |
202 | ||
203 | table = xfrm6_policy_table; | |
204 | if (!net_eq(net, &init_net)) { | |
205 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
206 | if (!table) | |
207 | goto err_alloc; | |
208 | ||
209 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
210 | } | |
211 | ||
212 | hdr = register_net_sysctl(net, "net/ipv6", table); | |
213 | if (!hdr) | |
214 | goto err_reg; | |
215 | ||
216 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
217 | return 0; | |
218 | ||
219 | err_reg: | |
220 | if (!net_eq(net, &init_net)) | |
221 | kfree(table); | |
222 | err_alloc: | |
223 | return -ENOMEM; | |
224 | } | |
225 | ||
a8a572a6 | 226 | static void __net_exit xfrm6_net_sysctl_exit(struct net *net) |
8d068875 MK |
227 | { |
228 | struct ctl_table *table; | |
229 | ||
63159f29 | 230 | if (!net->ipv6.sysctl.xfrm6_hdr) |
8d068875 MK |
231 | return; |
232 | ||
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)) | |
236 | kfree(table); | |
237 | } | |
a8a572a6 | 238 | #else /* CONFIG_SYSCTL */ |
318d3cc0 | 239 | static inline int xfrm6_net_sysctl_init(struct net *net) |
a8a572a6 DS |
240 | { |
241 | return 0; | |
242 | } | |
243 | ||
318d3cc0 | 244 | static inline void xfrm6_net_sysctl_exit(struct net *net) |
a8a572a6 DS |
245 | { |
246 | } | |
247 | #endif | |
248 | ||
249 | static int __net_init xfrm6_net_init(struct net *net) | |
250 | { | |
251 | int ret; | |
252 | ||
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); | |
256 | if (ret) | |
257 | return ret; | |
258 | ||
259 | ret = xfrm6_net_sysctl_init(net); | |
260 | if (ret) | |
261 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
262 | ||
263 | return ret; | |
264 | } | |
265 | ||
266 | static void __net_exit xfrm6_net_exit(struct net *net) | |
267 | { | |
268 | xfrm6_net_sysctl_exit(net); | |
269 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
270 | } | |
8d068875 MK |
271 | |
272 | static struct pernet_operations xfrm6_net_ops = { | |
273 | .init = xfrm6_net_init, | |
274 | .exit = xfrm6_net_exit, | |
275 | }; | |
a44a4a00 | 276 | |
0013caba | 277 | int __init xfrm6_init(void) |
1da177e4 | 278 | { |
0013caba | 279 | int ret; |
c3813286 | 280 | |
d7c7544c | 281 | ret = xfrm6_policy_init(); |
a8a572a6 | 282 | if (ret) |
d7c7544c | 283 | goto out; |
d7c7544c AD |
284 | ret = xfrm6_state_init(); |
285 | if (ret) | |
286 | goto out_policy; | |
287 | ||
7e14ea15 SK |
288 | ret = xfrm6_protocol_init(); |
289 | if (ret) | |
290 | goto out_state; | |
291 | ||
8d068875 | 292 | register_pernet_subsys(&xfrm6_net_ops); |
0013caba DL |
293 | out: |
294 | return ret; | |
7e14ea15 SK |
295 | out_state: |
296 | xfrm6_state_fini(); | |
0013caba DL |
297 | out_policy: |
298 | xfrm6_policy_fini(); | |
299 | goto out; | |
1da177e4 LT |
300 | } |
301 | ||
302 | void xfrm6_fini(void) | |
303 | { | |
8d068875 | 304 | unregister_pernet_subsys(&xfrm6_net_ops); |
7e14ea15 | 305 | xfrm6_protocol_fini(); |
1da177e4 LT |
306 | xfrm6_policy_fini(); |
307 | xfrm6_state_fini(); | |
308 | } |