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Commit | Line | Data |
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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)); |
40867d74 | 36 | fl6.flowi6_l3mdev = l3mdev_master_ifindex_by_index(net, oif); |
077fbac4 | 37 | fl6.flowi6_mark = mark; |
7e1dc7b6 | 38 | memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr)); |
66cdb3ca | 39 | if (saddr) |
7e1dc7b6 | 40 | memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr)); |
66cdb3ca | 41 | |
4c9483b2 | 42 | dst = ip6_route_output(net, NULL, &fl6); |
66cdb3ca HX |
43 | |
44 | err = dst->error; | |
45 | if (dst->error) { | |
4251320f | 46 | dst_release(dst); |
66cdb3ca HX |
47 | dst = ERR_PTR(err); |
48 | } | |
49 | ||
50 | return dst; | |
1da177e4 LT |
51 | } |
52 | ||
42a7b32b | 53 | static int xfrm6_get_saddr(struct net *net, int oif, |
077fbac4 LC |
54 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
55 | u32 mark) | |
a1e59abf | 56 | { |
66cdb3ca | 57 | struct dst_entry *dst; |
191cd582 | 58 | struct net_device *dev; |
66cdb3ca | 59 | |
077fbac4 | 60 | dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark); |
66cdb3ca HX |
61 | if (IS_ERR(dst)) |
62 | return -EHOSTUNREACH; | |
63 | ||
191cd582 | 64 | dev = ip6_dst_idev(dst)->dev; |
15e318bd | 65 | ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6); |
66cdb3ca HX |
66 | dst_release(dst); |
67 | return 0; | |
a1e59abf PM |
68 | } |
69 | ||
87c1e12b | 70 | static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 71 | const struct flowi *fl) |
25ee3286 | 72 | { |
e8dfd42c | 73 | struct rt6_info *rt = dst_rt6_info(xdst->route); |
1da177e4 | 74 | |
25ee3286 | 75 | xdst->u.dst.dev = dev; |
d62607c3 | 76 | netdev_hold(dev, &xdst->u.dst.dev_tracker, GFP_ATOMIC); |
1da177e4 | 77 | |
bc8e4b95 | 78 | xdst->u.rt6.rt6i_idev = in6_dev_get(dev); |
84c4a9df | 79 | if (!xdst->u.rt6.rt6i_idev) { |
d62607c3 | 80 | netdev_put(dev, &xdst->u.dst.dev_tracker); |
25ee3286 | 81 | return -ENODEV; |
84c4a9df | 82 | } |
1da177e4 | 83 | |
25ee3286 HX |
84 | /* Sheit... I remember I did this right. Apparently, |
85 | * it was magically lost, so this code needs audit */ | |
86 | xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST | | |
87 | RTF_LOCAL); | |
b197df4f | 88 | xdst->route_cookie = rt6_get_cookie(rt); |
25ee3286 HX |
89 | xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway; |
90 | xdst->u.rt6.rt6i_dst = rt->rt6i_dst; | |
91 | xdst->u.rt6.rt6i_src = rt->rt6i_src; | |
510c321b | 92 | rt6_uncached_list_add(&xdst->u.rt6); |
1da177e4 | 93 | |
1da177e4 | 94 | return 0; |
1da177e4 LT |
95 | } |
96 | ||
6700c270 | 97 | static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
98 | struct sk_buff *skb, u32 mtu, |
99 | bool confirm_neigh) | |
1da177e4 LT |
100 | { |
101 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
102 | struct dst_entry *path = xdst->route; | |
103 | ||
bd085ef6 | 104 | path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh); |
1da177e4 LT |
105 | } |
106 | ||
6700c270 DM |
107 | static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk, |
108 | struct sk_buff *skb) | |
ec18d9a2 DM |
109 | { |
110 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
111 | struct dst_entry *path = xdst->route; | |
112 | ||
6700c270 | 113 | path->ops->redirect(path, sk, skb); |
ec18d9a2 DM |
114 | } |
115 | ||
aabc9761 HX |
116 | static void xfrm6_dst_destroy(struct dst_entry *dst) |
117 | { | |
118 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
119 | ||
62fa8a84 | 120 | dst_destroy_metrics_generic(dst); |
418a7307 | 121 | rt6_uncached_list_del(&xdst->u.rt6); |
cc9b364b ZC |
122 | if (likely(xdst->u.rt6.rt6i_idev)) |
123 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
aabc9761 HX |
124 | xfrm_dst_destroy(xdst); |
125 | } | |
126 | ||
43c28172 | 127 | static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
aabc9761 HX |
128 | { |
129 | struct xfrm_dst *xdst; | |
130 | ||
aabc9761 HX |
131 | xdst = (struct xfrm_dst *)dst; |
132 | if (xdst->u.rt6.rt6i_idev->dev == dev) { | |
5a3e55d6 | 133 | struct inet6_dev *loopback_idev = |
c346dca1 | 134 | in6_dev_get(dev_net(dev)->loopback_dev); |
aabc9761 HX |
135 | |
136 | do { | |
137 | in6_dev_put(xdst->u.rt6.rt6i_idev); | |
138 | xdst->u.rt6.rt6i_idev = loopback_idev; | |
139 | in6_dev_hold(loopback_idev); | |
b92cf4aa | 140 | xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst); |
aabc9761 HX |
141 | } while (xdst->u.dst.xfrm); |
142 | ||
143 | __in6_dev_put(loopback_idev); | |
144 | } | |
145 | ||
146 | xfrm_dst_ifdown(dst, dev); | |
147 | } | |
148 | ||
a8a572a6 | 149 | static struct dst_ops xfrm6_dst_ops_template = { |
1da177e4 | 150 | .family = AF_INET6, |
1da177e4 | 151 | .update_pmtu = xfrm6_update_pmtu, |
ec18d9a2 | 152 | .redirect = xfrm6_redirect, |
62fa8a84 | 153 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 HX |
154 | .destroy = xfrm6_dst_destroy, |
155 | .ifdown = xfrm6_dst_ifdown, | |
862b82c6 | 156 | .local_out = __ip6_local_out, |
3c2a89dd | 157 | .gc_thresh = 32768, |
1da177e4 LT |
158 | }; |
159 | ||
37b10383 | 160 | static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = { |
a8a572a6 | 161 | .dst_ops = &xfrm6_dst_ops_template, |
1da177e4 | 162 | .dst_lookup = xfrm6_dst_lookup, |
67ba4152 | 163 | .get_saddr = xfrm6_get_saddr, |
25ee3286 | 164 | .fill_dst = xfrm6_fill_dst, |
2774c131 | 165 | .blackhole_route = ip6_blackhole_route, |
1da177e4 LT |
166 | }; |
167 | ||
0013caba | 168 | static int __init xfrm6_policy_init(void) |
1da177e4 | 169 | { |
a2817d8b | 170 | return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6); |
1da177e4 LT |
171 | } |
172 | ||
173 | static void xfrm6_policy_fini(void) | |
174 | { | |
175 | xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo); | |
176 | } | |
177 | ||
db71789c | 178 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
179 | static struct ctl_table xfrm6_policy_table[] = { |
180 | { | |
a44a4a00 | 181 | .procname = "xfrm6_gc_thresh", |
67ba4152 IM |
182 | .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh, |
183 | .maxlen = sizeof(int), | |
184 | .mode = 0644, | |
a44a4a00 NH |
185 | .proc_handler = proc_dointvec, |
186 | }, | |
a44a4a00 NH |
187 | }; |
188 | ||
a8a572a6 | 189 | static int __net_init xfrm6_net_sysctl_init(struct net *net) |
8d068875 MK |
190 | { |
191 | struct ctl_table *table; | |
192 | struct ctl_table_header *hdr; | |
193 | ||
194 | table = xfrm6_policy_table; | |
195 | if (!net_eq(net, &init_net)) { | |
196 | table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL); | |
197 | if (!table) | |
198 | goto err_alloc; | |
199 | ||
200 | table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh; | |
201 | } | |
202 | ||
c899710f JG |
203 | hdr = register_net_sysctl_sz(net, "net/ipv6", table, |
204 | ARRAY_SIZE(xfrm6_policy_table)); | |
8d068875 MK |
205 | if (!hdr) |
206 | goto err_reg; | |
207 | ||
208 | net->ipv6.sysctl.xfrm6_hdr = hdr; | |
209 | return 0; | |
210 | ||
211 | err_reg: | |
212 | if (!net_eq(net, &init_net)) | |
213 | kfree(table); | |
214 | err_alloc: | |
215 | return -ENOMEM; | |
216 | } | |
217 | ||
a8a572a6 | 218 | static void __net_exit xfrm6_net_sysctl_exit(struct net *net) |
8d068875 | 219 | { |
bfa858f2 | 220 | const struct ctl_table *table; |
8d068875 | 221 | |
63159f29 | 222 | if (!net->ipv6.sysctl.xfrm6_hdr) |
8d068875 MK |
223 | return; |
224 | ||
225 | table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg; | |
226 | unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr); | |
227 | if (!net_eq(net, &init_net)) | |
228 | kfree(table); | |
229 | } | |
a8a572a6 | 230 | #else /* CONFIG_SYSCTL */ |
318d3cc0 | 231 | static inline int xfrm6_net_sysctl_init(struct net *net) |
a8a572a6 DS |
232 | { |
233 | return 0; | |
234 | } | |
235 | ||
318d3cc0 | 236 | static inline void xfrm6_net_sysctl_exit(struct net *net) |
a8a572a6 DS |
237 | { |
238 | } | |
239 | #endif | |
240 | ||
241 | static int __net_init xfrm6_net_init(struct net *net) | |
242 | { | |
243 | int ret; | |
244 | ||
245 | memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template, | |
246 | sizeof(xfrm6_dst_ops_template)); | |
247 | ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops); | |
248 | if (ret) | |
249 | return ret; | |
250 | ||
251 | ret = xfrm6_net_sysctl_init(net); | |
252 | if (ret) | |
253 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | static void __net_exit xfrm6_net_exit(struct net *net) | |
259 | { | |
260 | xfrm6_net_sysctl_exit(net); | |
261 | dst_entries_destroy(&net->xfrm.xfrm6_dst_ops); | |
262 | } | |
8d068875 MK |
263 | |
264 | static struct pernet_operations xfrm6_net_ops = { | |
265 | .init = xfrm6_net_init, | |
266 | .exit = xfrm6_net_exit, | |
267 | }; | |
a44a4a00 | 268 | |
0013caba | 269 | int __init xfrm6_init(void) |
1da177e4 | 270 | { |
0013caba | 271 | int ret; |
c3813286 | 272 | |
d7c7544c | 273 | ret = xfrm6_policy_init(); |
a8a572a6 | 274 | if (ret) |
d7c7544c | 275 | goto out; |
d7c7544c AD |
276 | ret = xfrm6_state_init(); |
277 | if (ret) | |
278 | goto out_policy; | |
279 | ||
7e14ea15 SK |
280 | ret = xfrm6_protocol_init(); |
281 | if (ret) | |
282 | goto out_state; | |
283 | ||
40781bfb CZ |
284 | ret = register_pernet_subsys(&xfrm6_net_ops); |
285 | if (ret) | |
286 | goto out_protocol; | |
0013caba DL |
287 | out: |
288 | return ret; | |
40781bfb CZ |
289 | out_protocol: |
290 | xfrm6_protocol_fini(); | |
7e14ea15 SK |
291 | out_state: |
292 | xfrm6_state_fini(); | |
0013caba DL |
293 | out_policy: |
294 | xfrm6_policy_fini(); | |
295 | goto out; | |
1da177e4 LT |
296 | } |
297 | ||
298 | void xfrm6_fini(void) | |
299 | { | |
8d068875 | 300 | unregister_pernet_subsys(&xfrm6_net_ops); |
7e14ea15 | 301 | xfrm6_protocol_fini(); |
1da177e4 LT |
302 | xfrm6_policy_fini(); |
303 | xfrm6_state_fini(); | |
304 | } |