Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e905a9ed | 2 | /* |
1da177e4 LT |
3 | * xfrm4_policy.c |
4 | * | |
5 | * Changes: | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * YOSHIFUJI Hideaki @USAGI | |
8 | * Split up af-specific portion | |
e905a9ed | 9 | * |
1da177e4 LT |
10 | */ |
11 | ||
66cdb3ca HX |
12 | #include <linux/err.h> |
13 | #include <linux/kernel.h> | |
aabc9761 | 14 | #include <linux/inetdevice.h> |
45ff5a3f | 15 | #include <net/dst.h> |
1da177e4 LT |
16 | #include <net/xfrm.h> |
17 | #include <net/ip.h> | |
385add90 | 18 | #include <net/l3mdev.h> |
1da177e4 | 19 | |
8f01cb08 | 20 | static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4, |
42a7b32b | 21 | int tos, int oif, |
8f01cb08 | 22 | const xfrm_address_t *saddr, |
077fbac4 LC |
23 | const xfrm_address_t *daddr, |
24 | u32 mark) | |
1da177e4 | 25 | { |
66cdb3ca | 26 | struct rtable *rt; |
a1e59abf | 27 | |
8f01cb08 DM |
28 | memset(fl4, 0, sizeof(*fl4)); |
29 | fl4->daddr = daddr->a4; | |
30 | fl4->flowi4_tos = tos; | |
40867d74 | 31 | fl4->flowi4_l3mdev = l3mdev_master_ifindex_by_index(net, oif); |
077fbac4 | 32 | fl4->flowi4_mark = mark; |
66cdb3ca | 33 | if (saddr) |
8f01cb08 | 34 | fl4->saddr = saddr->a4; |
66cdb3ca | 35 | |
8f01cb08 | 36 | rt = __ip_route_output_key(net, fl4); |
b23dd4fe DM |
37 | if (!IS_ERR(rt)) |
38 | return &rt->dst; | |
39 | ||
40 | return ERR_CAST(rt); | |
66cdb3ca HX |
41 | } |
42 | ||
42a7b32b | 43 | static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif, |
8f01cb08 | 44 | const xfrm_address_t *saddr, |
077fbac4 LC |
45 | const xfrm_address_t *daddr, |
46 | u32 mark) | |
8f01cb08 DM |
47 | { |
48 | struct flowi4 fl4; | |
49 | ||
077fbac4 | 50 | return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr, mark); |
8f01cb08 DM |
51 | } |
52 | ||
42a7b32b | 53 | static int xfrm4_get_saddr(struct net *net, int oif, |
077fbac4 LC |
54 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
55 | u32 mark) | |
66cdb3ca HX |
56 | { |
57 | struct dst_entry *dst; | |
8f01cb08 | 58 | struct flowi4 fl4; |
66cdb3ca | 59 | |
077fbac4 | 60 | dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr, mark); |
66cdb3ca HX |
61 | if (IS_ERR(dst)) |
62 | return -EHOSTUNREACH; | |
63 | ||
8f01cb08 | 64 | saddr->a4 = fl4.saddr; |
66cdb3ca HX |
65 | dst_release(dst); |
66 | return 0; | |
a1e59abf PM |
67 | } |
68 | ||
87c1e12b | 69 | static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 70 | const struct flowi *fl) |
25ee3286 HX |
71 | { |
72 | struct rtable *rt = (struct rtable *)xdst->route; | |
7e1dc7b6 | 73 | const struct flowi4 *fl4 = &fl->u.ip4; |
1da177e4 | 74 | |
b7323396 | 75 | xdst->u.rt.rt_iif = fl4->flowi4_iif; |
1da177e4 | 76 | |
25ee3286 | 77 | xdst->u.dst.dev = dev; |
d62607c3 | 78 | netdev_hold(dev, &xdst->u.dst.dev_tracker, GFP_ATOMIC); |
43372262 | 79 | |
25ee3286 HX |
80 | /* Sheit... I remember I did this right. Apparently, |
81 | * it was magically lost, so this code needs audit */ | |
9917e1e8 | 82 | xdst->u.rt.rt_is_input = rt->rt_is_input; |
25ee3286 HX |
83 | xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | |
84 | RTCF_LOCAL); | |
85 | xdst->u.rt.rt_type = rt->rt_type; | |
77d5bc7e | 86 | xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway; |
1550c171 DA |
87 | xdst->u.rt.rt_gw_family = rt->rt_gw_family; |
88 | if (rt->rt_gw_family == AF_INET) | |
89 | xdst->u.rt.rt_gw4 = rt->rt_gw4; | |
0f5f7d7b DA |
90 | else if (rt->rt_gw_family == AF_INET6) |
91 | xdst->u.rt.rt_gw6 = rt->rt_gw6; | |
5943634f | 92 | xdst->u.rt.rt_pmtu = rt->rt_pmtu; |
d52e5a7e | 93 | xdst->u.rt.rt_mtu_locked = rt->rt_mtu_locked; |
510c321b | 94 | rt_add_uncached_list(&xdst->u.rt); |
1da177e4 | 95 | |
1da177e4 | 96 | return 0; |
1da177e4 LT |
97 | } |
98 | ||
6700c270 | 99 | static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
100 | struct sk_buff *skb, u32 mtu, |
101 | bool confirm_neigh) | |
1da177e4 LT |
102 | { |
103 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
104 | struct dst_entry *path = xdst->route; | |
105 | ||
bd085ef6 | 106 | path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh); |
1da177e4 LT |
107 | } |
108 | ||
6700c270 DM |
109 | static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk, |
110 | struct sk_buff *skb) | |
55be7a9c DM |
111 | { |
112 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
113 | struct dst_entry *path = xdst->route; | |
114 | ||
6700c270 | 115 | path->ops->redirect(path, sk, skb); |
55be7a9c DM |
116 | } |
117 | ||
aabc9761 HX |
118 | static void xfrm4_dst_destroy(struct dst_entry *dst) |
119 | { | |
120 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
121 | ||
62fa8a84 | 122 | dst_destroy_metrics_generic(dst); |
418a7307 | 123 | rt_del_uncached_list(&xdst->u.rt); |
aabc9761 HX |
124 | xfrm_dst_destroy(xdst); |
125 | } | |
126 | ||
a8a572a6 | 127 | static struct dst_ops xfrm4_dst_ops_template = { |
1da177e4 | 128 | .family = AF_INET, |
1da177e4 | 129 | .update_pmtu = xfrm4_update_pmtu, |
55be7a9c | 130 | .redirect = xfrm4_redirect, |
62fa8a84 | 131 | .cow_metrics = dst_cow_metrics_generic, |
aabc9761 | 132 | .destroy = xfrm4_dst_destroy, |
43c28172 | 133 | .ifdown = xfrm_dst_ifdown, |
862b82c6 | 134 | .local_out = __ip_local_out, |
3c2a89dd | 135 | .gc_thresh = 32768, |
1da177e4 LT |
136 | }; |
137 | ||
37b10383 | 138 | static const struct xfrm_policy_afinfo xfrm4_policy_afinfo = { |
a8a572a6 | 139 | .dst_ops = &xfrm4_dst_ops_template, |
1da177e4 | 140 | .dst_lookup = xfrm4_dst_lookup, |
a1e59abf | 141 | .get_saddr = xfrm4_get_saddr, |
25ee3286 | 142 | .fill_dst = xfrm4_fill_dst, |
2774c131 | 143 | .blackhole_route = ipv4_blackhole_route, |
1da177e4 LT |
144 | }; |
145 | ||
f816700a | 146 | #ifdef CONFIG_SYSCTL |
a44a4a00 NH |
147 | static struct ctl_table xfrm4_policy_table[] = { |
148 | { | |
a44a4a00 | 149 | .procname = "xfrm4_gc_thresh", |
d7c7544c | 150 | .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh, |
a44a4a00 NH |
151 | .maxlen = sizeof(int), |
152 | .mode = 0644, | |
153 | .proc_handler = proc_dointvec, | |
154 | }, | |
155 | { } | |
156 | }; | |
157 | ||
318d3cc0 | 158 | static __net_init int xfrm4_net_sysctl_init(struct net *net) |
8d068875 MK |
159 | { |
160 | struct ctl_table *table; | |
161 | struct ctl_table_header *hdr; | |
162 | ||
163 | table = xfrm4_policy_table; | |
164 | if (!net_eq(net, &init_net)) { | |
165 | table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL); | |
166 | if (!table) | |
167 | goto err_alloc; | |
168 | ||
169 | table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh; | |
170 | } | |
171 | ||
c899710f JG |
172 | hdr = register_net_sysctl_sz(net, "net/ipv4", table, |
173 | ARRAY_SIZE(xfrm4_policy_table)); | |
8d068875 MK |
174 | if (!hdr) |
175 | goto err_reg; | |
176 | ||
177 | net->ipv4.xfrm4_hdr = hdr; | |
178 | return 0; | |
179 | ||
180 | err_reg: | |
181 | if (!net_eq(net, &init_net)) | |
182 | kfree(table); | |
183 | err_alloc: | |
184 | return -ENOMEM; | |
185 | } | |
186 | ||
318d3cc0 | 187 | static __net_exit void xfrm4_net_sysctl_exit(struct net *net) |
8d068875 MK |
188 | { |
189 | struct ctl_table *table; | |
190 | ||
51456b29 | 191 | if (!net->ipv4.xfrm4_hdr) |
8d068875 MK |
192 | return; |
193 | ||
194 | table = net->ipv4.xfrm4_hdr->ctl_table_arg; | |
195 | unregister_net_sysctl_table(net->ipv4.xfrm4_hdr); | |
196 | if (!net_eq(net, &init_net)) | |
197 | kfree(table); | |
198 | } | |
a8a572a6 | 199 | #else /* CONFIG_SYSCTL */ |
318d3cc0 | 200 | static inline int xfrm4_net_sysctl_init(struct net *net) |
a8a572a6 DS |
201 | { |
202 | return 0; | |
203 | } | |
204 | ||
318d3cc0 | 205 | static inline void xfrm4_net_sysctl_exit(struct net *net) |
a8a572a6 DS |
206 | { |
207 | } | |
208 | #endif | |
209 | ||
210 | static int __net_init xfrm4_net_init(struct net *net) | |
211 | { | |
212 | int ret; | |
213 | ||
214 | memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template, | |
215 | sizeof(xfrm4_dst_ops_template)); | |
216 | ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops); | |
217 | if (ret) | |
218 | return ret; | |
219 | ||
220 | ret = xfrm4_net_sysctl_init(net); | |
221 | if (ret) | |
222 | dst_entries_destroy(&net->xfrm.xfrm4_dst_ops); | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
227 | static void __net_exit xfrm4_net_exit(struct net *net) | |
228 | { | |
229 | xfrm4_net_sysctl_exit(net); | |
230 | dst_entries_destroy(&net->xfrm.xfrm4_dst_ops); | |
231 | } | |
8d068875 MK |
232 | |
233 | static struct pernet_operations __net_initdata xfrm4_net_ops = { | |
234 | .init = xfrm4_net_init, | |
235 | .exit = xfrm4_net_exit, | |
236 | }; | |
a44a4a00 | 237 | |
1da177e4 LT |
238 | static void __init xfrm4_policy_init(void) |
239 | { | |
a2817d8b | 240 | xfrm_policy_register_afinfo(&xfrm4_policy_afinfo, AF_INET); |
1da177e4 LT |
241 | } |
242 | ||
703fb94e | 243 | void __init xfrm4_init(void) |
1da177e4 | 244 | { |
d7c7544c AD |
245 | xfrm4_state_init(); |
246 | xfrm4_policy_init(); | |
2f32b51b | 247 | xfrm4_protocol_init(); |
8d068875 | 248 | register_pernet_subsys(&xfrm4_net_ops); |
1da177e4 | 249 | } |