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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xfrm6_policy.c: based on xfrm4_policy.c
4 *
5 * Authors:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 *
13 */
14
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(const struct xfrm_dst_lookup_params *params)
27{
28 struct flowi6 fl6;
29 struct dst_entry *dst;
30 int err;
31
32 memset(&fl6, 0, sizeof(fl6));
33 fl6.flowi6_l3mdev = l3mdev_master_ifindex_by_index(params->net,
34 params->oif);
35 fl6.flowi6_mark = params->mark;
36 memcpy(&fl6.daddr, params->daddr, sizeof(fl6.daddr));
37 if (params->saddr)
38 memcpy(&fl6.saddr, params->saddr, sizeof(fl6.saddr));
39
40 fl6.flowi4_proto = params->ipproto;
41 fl6.uli = params->uli;
42
43 dst = ip6_route_output(params->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(xfrm_address_t *saddr,
55 const struct xfrm_dst_lookup_params *params)
56{
57 struct dst_entry *dst;
58 struct net_device *dev;
59 struct inet6_dev *idev;
60
61 dst = xfrm6_dst_lookup(params);
62 if (IS_ERR(dst))
63 return -EHOSTUNREACH;
64
65 idev = ip6_dst_idev(dst);
66 if (!idev) {
67 dst_release(dst);
68 return -EHOSTUNREACH;
69 }
70 dev = idev->dev;
71 ipv6_dev_get_saddr(dev_net(dev), dev, ¶ms->daddr->in6, 0,
72 &saddr->in6);
73 dst_release(dst);
74 return 0;
75}
76
77static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
78 const struct flowi *fl)
79{
80 struct rt6_info *rt = dst_rt6_info(xdst->route);
81
82 xdst->u.dst.dev = dev;
83 netdev_hold(dev, &xdst->u.dst.dev_tracker, GFP_ATOMIC);
84
85 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
86 if (!xdst->u.rt6.rt6i_idev) {
87 netdev_put(dev, &xdst->u.dst.dev_tracker);
88 return -ENODEV;
89 }
90
91 /* Sheit... I remember I did this right. Apparently,
92 * it was magically lost, so this code needs audit */
93 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
94 RTF_LOCAL);
95 xdst->route_cookie = rt6_get_cookie(rt);
96 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
97 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
98 xdst->u.rt6.rt6i_src = rt->rt6i_src;
99 rt6_uncached_list_add(&xdst->u.rt6);
100
101 return 0;
102}
103
104static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
105 struct sk_buff *skb, u32 mtu,
106 bool confirm_neigh)
107{
108 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
109 struct dst_entry *path = xdst->route;
110
111 path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh);
112}
113
114static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
115 struct sk_buff *skb)
116{
117 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
118 struct dst_entry *path = xdst->route;
119
120 path->ops->redirect(path, sk, skb);
121}
122
123static void xfrm6_dst_destroy(struct dst_entry *dst)
124{
125 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
126
127 dst_destroy_metrics_generic(dst);
128 rt6_uncached_list_del(&xdst->u.rt6);
129 if (likely(xdst->u.rt6.rt6i_idev))
130 in6_dev_put(xdst->u.rt6.rt6i_idev);
131 xfrm_dst_destroy(xdst);
132}
133
134static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
135{
136 struct xfrm_dst *xdst;
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
196static int __net_init xfrm6_net_sysctl_init(struct net *net)
197{
198 struct ctl_table *table;
199 struct ctl_table_header *hdr;
200
201 table = xfrm6_policy_table;
202 if (!net_eq(net, &init_net)) {
203 table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
204 if (!table)
205 goto err_alloc;
206
207 table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
208 }
209
210 hdr = register_net_sysctl_sz(net, "net/ipv6", table,
211 ARRAY_SIZE(xfrm6_policy_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 const 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 /* CONFIG_SYSCTL */
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 ret = register_pernet_subsys(&xfrm6_net_ops);
292 if (ret)
293 goto out_protocol;
294
295 ret = xfrm_nat_keepalive_init(AF_INET6);
296 if (ret)
297 goto out_nat_keepalive;
298out:
299 return ret;
300out_nat_keepalive:
301 unregister_pernet_subsys(&xfrm6_net_ops);
302out_protocol:
303 xfrm6_protocol_fini();
304out_state:
305 xfrm6_state_fini();
306out_policy:
307 xfrm6_policy_fini();
308 goto out;
309}
310
311void xfrm6_fini(void)
312{
313 xfrm_nat_keepalive_fini(AF_INET6);
314 unregister_pernet_subsys(&xfrm6_net_ops);
315 xfrm6_protocol_fini();
316 xfrm6_policy_fini();
317 xfrm6_state_fini();
318}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xfrm6_policy.c: based on xfrm4_policy.c
4 *
5 * Authors:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 *
13 */
14
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_l3mdev = l3mdev_master_ifindex_by_index(net, oif);
37 fl6.flowi6_mark = mark;
38 memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
39 if (saddr)
40 memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
41
42 dst = ip6_route_output(net, NULL, &fl6);
43
44 err = dst->error;
45 if (dst->error) {
46 dst_release(dst);
47 dst = ERR_PTR(err);
48 }
49
50 return dst;
51}
52
53static int xfrm6_get_saddr(struct net *net, int oif,
54 xfrm_address_t *saddr, xfrm_address_t *daddr,
55 u32 mark)
56{
57 struct dst_entry *dst;
58 struct net_device *dev;
59
60 dst = xfrm6_dst_lookup(net, 0, oif, NULL, daddr, mark);
61 if (IS_ERR(dst))
62 return -EHOSTUNREACH;
63
64 dev = ip6_dst_idev(dst)->dev;
65 ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
66 dst_release(dst);
67 return 0;
68}
69
70static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
71 const struct flowi *fl)
72{
73 struct rt6_info *rt = (struct rt6_info *)xdst->route;
74
75 xdst->u.dst.dev = dev;
76 netdev_hold(dev, &xdst->u.dst.dev_tracker, GFP_ATOMIC);
77
78 xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
79 if (!xdst->u.rt6.rt6i_idev) {
80 netdev_put(dev, &xdst->u.dst.dev_tracker);
81 return -ENODEV;
82 }
83
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);
88 xdst->route_cookie = rt6_get_cookie(rt);
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;
92 INIT_LIST_HEAD(&xdst->u.rt6.rt6i_uncached);
93 rt6_uncached_list_add(&xdst->u.rt6);
94
95 return 0;
96}
97
98static void xfrm6_update_pmtu(struct dst_entry *dst, struct sock *sk,
99 struct sk_buff *skb, u32 mtu,
100 bool confirm_neigh)
101{
102 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
103 struct dst_entry *path = xdst->route;
104
105 path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh);
106}
107
108static void xfrm6_redirect(struct dst_entry *dst, struct sock *sk,
109 struct sk_buff *skb)
110{
111 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
112 struct dst_entry *path = xdst->route;
113
114 path->ops->redirect(path, sk, skb);
115}
116
117static void xfrm6_dst_destroy(struct dst_entry *dst)
118{
119 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
120
121 if (likely(xdst->u.rt6.rt6i_idev))
122 in6_dev_put(xdst->u.rt6.rt6i_idev);
123 dst_destroy_metrics_generic(dst);
124 if (xdst->u.rt6.rt6i_uncached_list)
125 rt6_uncached_list_del(&xdst->u.rt6);
126 xfrm_dst_destroy(xdst);
127}
128
129static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
130 int unregister)
131{
132 struct xfrm_dst *xdst;
133
134 if (!unregister)
135 return;
136
137 xdst = (struct xfrm_dst *)dst;
138 if (xdst->u.rt6.rt6i_idev->dev == dev) {
139 struct inet6_dev *loopback_idev =
140 in6_dev_get(dev_net(dev)->loopback_dev);
141
142 do {
143 in6_dev_put(xdst->u.rt6.rt6i_idev);
144 xdst->u.rt6.rt6i_idev = loopback_idev;
145 in6_dev_hold(loopback_idev);
146 xdst = (struct xfrm_dst *)xfrm_dst_child(&xdst->u.dst);
147 } while (xdst->u.dst.xfrm);
148
149 __in6_dev_put(loopback_idev);
150 }
151
152 xfrm_dst_ifdown(dst, dev);
153}
154
155static struct dst_ops xfrm6_dst_ops_template = {
156 .family = AF_INET6,
157 .update_pmtu = xfrm6_update_pmtu,
158 .redirect = xfrm6_redirect,
159 .cow_metrics = dst_cow_metrics_generic,
160 .destroy = xfrm6_dst_destroy,
161 .ifdown = xfrm6_dst_ifdown,
162 .local_out = __ip6_local_out,
163 .gc_thresh = 32768,
164};
165
166static const struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
167 .dst_ops = &xfrm6_dst_ops_template,
168 .dst_lookup = xfrm6_dst_lookup,
169 .get_saddr = xfrm6_get_saddr,
170 .fill_dst = xfrm6_fill_dst,
171 .blackhole_route = ip6_blackhole_route,
172};
173
174static int __init xfrm6_policy_init(void)
175{
176 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo, AF_INET6);
177}
178
179static void xfrm6_policy_fini(void)
180{
181 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
182}
183
184#ifdef CONFIG_SYSCTL
185static struct ctl_table xfrm6_policy_table[] = {
186 {
187 .procname = "xfrm6_gc_thresh",
188 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
189 .maxlen = sizeof(int),
190 .mode = 0644,
191 .proc_handler = proc_dointvec,
192 },
193 { }
194};
195
196static int __net_init xfrm6_net_sysctl_init(struct net *net)
197{
198 struct ctl_table *table;
199 struct ctl_table_header *hdr;
200
201 table = xfrm6_policy_table;
202 if (!net_eq(net, &init_net)) {
203 table = kmemdup(table, sizeof(xfrm6_policy_table), GFP_KERNEL);
204 if (!table)
205 goto err_alloc;
206
207 table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
208 }
209
210 hdr = register_net_sysctl(net, "net/ipv6", table);
211 if (!hdr)
212 goto err_reg;
213
214 net->ipv6.sysctl.xfrm6_hdr = hdr;
215 return 0;
216
217err_reg:
218 if (!net_eq(net, &init_net))
219 kfree(table);
220err_alloc:
221 return -ENOMEM;
222}
223
224static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
225{
226 struct ctl_table *table;
227
228 if (!net->ipv6.sysctl.xfrm6_hdr)
229 return;
230
231 table = net->ipv6.sysctl.xfrm6_hdr->ctl_table_arg;
232 unregister_net_sysctl_table(net->ipv6.sysctl.xfrm6_hdr);
233 if (!net_eq(net, &init_net))
234 kfree(table);
235}
236#else /* CONFIG_SYSCTL */
237static inline int xfrm6_net_sysctl_init(struct net *net)
238{
239 return 0;
240}
241
242static inline void xfrm6_net_sysctl_exit(struct net *net)
243{
244}
245#endif
246
247static int __net_init xfrm6_net_init(struct net *net)
248{
249 int ret;
250
251 memcpy(&net->xfrm.xfrm6_dst_ops, &xfrm6_dst_ops_template,
252 sizeof(xfrm6_dst_ops_template));
253 ret = dst_entries_init(&net->xfrm.xfrm6_dst_ops);
254 if (ret)
255 return ret;
256
257 ret = xfrm6_net_sysctl_init(net);
258 if (ret)
259 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
260
261 return ret;
262}
263
264static void __net_exit xfrm6_net_exit(struct net *net)
265{
266 xfrm6_net_sysctl_exit(net);
267 dst_entries_destroy(&net->xfrm.xfrm6_dst_ops);
268}
269
270static struct pernet_operations xfrm6_net_ops = {
271 .init = xfrm6_net_init,
272 .exit = xfrm6_net_exit,
273};
274
275int __init xfrm6_init(void)
276{
277 int ret;
278
279 ret = xfrm6_policy_init();
280 if (ret)
281 goto out;
282 ret = xfrm6_state_init();
283 if (ret)
284 goto out_policy;
285
286 ret = xfrm6_protocol_init();
287 if (ret)
288 goto out_state;
289
290 ret = register_pernet_subsys(&xfrm6_net_ops);
291 if (ret)
292 goto out_protocol;
293out:
294 return ret;
295out_protocol:
296 xfrm6_protocol_fini();
297out_state:
298 xfrm6_state_fini();
299out_policy:
300 xfrm6_policy_fini();
301 goto out;
302}
303
304void xfrm6_fini(void)
305{
306 unregister_pernet_subsys(&xfrm6_net_ops);
307 xfrm6_protocol_fini();
308 xfrm6_policy_fini();
309 xfrm6_state_fini();
310}