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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xfrm4_policy.c
4 *
5 * Changes:
6 * Kazunori MIYAZAWA @USAGI
7 * YOSHIFUJI Hideaki @USAGI
8 * Split up af-specific portion
9 *
10 */
11
12#include <linux/err.h>
13#include <linux/kernel.h>
14#include <linux/inetdevice.h>
15#include <net/dst.h>
16#include <net/xfrm.h>
17#include <net/ip.h>
18#include <net/l3mdev.h>
19
20static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
21 int tos, int oif,
22 const xfrm_address_t *saddr,
23 const xfrm_address_t *daddr,
24 u32 mark)
25{
26 struct rtable *rt;
27
28 memset(fl4, 0, sizeof(*fl4));
29 fl4->daddr = daddr->a4;
30 fl4->flowi4_tos = tos;
31 fl4->flowi4_oif = l3mdev_master_ifindex_by_index(net, oif);
32 fl4->flowi4_mark = mark;
33 if (saddr)
34 fl4->saddr = saddr->a4;
35
36 fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;
37
38 rt = __ip_route_output_key(net, fl4);
39 if (!IS_ERR(rt))
40 return &rt->dst;
41
42 return ERR_CAST(rt);
43}
44
45static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
46 const xfrm_address_t *saddr,
47 const xfrm_address_t *daddr,
48 u32 mark)
49{
50 struct flowi4 fl4;
51
52 return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr, mark);
53}
54
55static int xfrm4_get_saddr(struct net *net, int oif,
56 xfrm_address_t *saddr, xfrm_address_t *daddr,
57 u32 mark)
58{
59 struct dst_entry *dst;
60 struct flowi4 fl4;
61
62 dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr, mark);
63 if (IS_ERR(dst))
64 return -EHOSTUNREACH;
65
66 saddr->a4 = fl4.saddr;
67 dst_release(dst);
68 return 0;
69}
70
71static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
72 const struct flowi *fl)
73{
74 struct rtable *rt = (struct rtable *)xdst->route;
75 const struct flowi4 *fl4 = &fl->u.ip4;
76
77 xdst->u.rt.rt_iif = fl4->flowi4_iif;
78
79 xdst->u.dst.dev = dev;
80 dev_hold(dev);
81
82 /* Sheit... I remember I did this right. Apparently,
83 * it was magically lost, so this code needs audit */
84 xdst->u.rt.rt_is_input = rt->rt_is_input;
85 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
86 RTCF_LOCAL);
87 xdst->u.rt.rt_type = rt->rt_type;
88 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
89 xdst->u.rt.rt_gw_family = rt->rt_gw_family;
90 if (rt->rt_gw_family == AF_INET)
91 xdst->u.rt.rt_gw4 = rt->rt_gw4;
92 else if (rt->rt_gw_family == AF_INET6)
93 xdst->u.rt.rt_gw6 = rt->rt_gw6;
94 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
95 xdst->u.rt.rt_mtu_locked = rt->rt_mtu_locked;
96 INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
97 rt_add_uncached_list(&xdst->u.rt);
98
99 return 0;
100}
101
102static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
103 struct sk_buff *skb, u32 mtu,
104 bool confirm_neigh)
105{
106 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
107 struct dst_entry *path = xdst->route;
108
109 path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh);
110}
111
112static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
113 struct sk_buff *skb)
114{
115 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
116 struct dst_entry *path = xdst->route;
117
118 path->ops->redirect(path, sk, skb);
119}
120
121static void xfrm4_dst_destroy(struct dst_entry *dst)
122{
123 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
124
125 dst_destroy_metrics_generic(dst);
126 if (xdst->u.rt.rt_uncached_list)
127 rt_del_uncached_list(&xdst->u.rt);
128 xfrm_dst_destroy(xdst);
129}
130
131static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
132 int unregister)
133{
134 if (!unregister)
135 return;
136
137 xfrm_dst_ifdown(dst, dev);
138}
139
140static struct dst_ops xfrm4_dst_ops_template = {
141 .family = AF_INET,
142 .update_pmtu = xfrm4_update_pmtu,
143 .redirect = xfrm4_redirect,
144 .cow_metrics = dst_cow_metrics_generic,
145 .destroy = xfrm4_dst_destroy,
146 .ifdown = xfrm4_dst_ifdown,
147 .local_out = __ip_local_out,
148 .gc_thresh = 32768,
149};
150
151static const struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
152 .dst_ops = &xfrm4_dst_ops_template,
153 .dst_lookup = xfrm4_dst_lookup,
154 .get_saddr = xfrm4_get_saddr,
155 .fill_dst = xfrm4_fill_dst,
156 .blackhole_route = ipv4_blackhole_route,
157};
158
159#ifdef CONFIG_SYSCTL
160static struct ctl_table xfrm4_policy_table[] = {
161 {
162 .procname = "xfrm4_gc_thresh",
163 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
164 .maxlen = sizeof(int),
165 .mode = 0644,
166 .proc_handler = proc_dointvec,
167 },
168 { }
169};
170
171static __net_init int xfrm4_net_sysctl_init(struct net *net)
172{
173 struct ctl_table *table;
174 struct ctl_table_header *hdr;
175
176 table = xfrm4_policy_table;
177 if (!net_eq(net, &init_net)) {
178 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
179 if (!table)
180 goto err_alloc;
181
182 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
183 }
184
185 hdr = register_net_sysctl(net, "net/ipv4", table);
186 if (!hdr)
187 goto err_reg;
188
189 net->ipv4.xfrm4_hdr = hdr;
190 return 0;
191
192err_reg:
193 if (!net_eq(net, &init_net))
194 kfree(table);
195err_alloc:
196 return -ENOMEM;
197}
198
199static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
200{
201 struct ctl_table *table;
202
203 if (!net->ipv4.xfrm4_hdr)
204 return;
205
206 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
207 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
208 if (!net_eq(net, &init_net))
209 kfree(table);
210}
211#else /* CONFIG_SYSCTL */
212static inline int xfrm4_net_sysctl_init(struct net *net)
213{
214 return 0;
215}
216
217static inline void xfrm4_net_sysctl_exit(struct net *net)
218{
219}
220#endif
221
222static int __net_init xfrm4_net_init(struct net *net)
223{
224 int ret;
225
226 memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template,
227 sizeof(xfrm4_dst_ops_template));
228 ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops);
229 if (ret)
230 return ret;
231
232 ret = xfrm4_net_sysctl_init(net);
233 if (ret)
234 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
235
236 return ret;
237}
238
239static void __net_exit xfrm4_net_exit(struct net *net)
240{
241 xfrm4_net_sysctl_exit(net);
242 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
243}
244
245static struct pernet_operations __net_initdata xfrm4_net_ops = {
246 .init = xfrm4_net_init,
247 .exit = xfrm4_net_exit,
248};
249
250static void __init xfrm4_policy_init(void)
251{
252 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo, AF_INET);
253}
254
255void __init xfrm4_init(void)
256{
257 xfrm4_state_init();
258 xfrm4_policy_init();
259 xfrm4_protocol_init();
260 register_pernet_subsys(&xfrm4_net_ops);
261}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xfrm4_policy.c
4 *
5 * Changes:
6 * Kazunori MIYAZAWA @USAGI
7 * YOSHIFUJI Hideaki @USAGI
8 * Split up af-specific portion
9 *
10 */
11
12#include <linux/err.h>
13#include <linux/kernel.h>
14#include <linux/inetdevice.h>
15#include <net/dst.h>
16#include <net/xfrm.h>
17#include <net/ip.h>
18#include <net/l3mdev.h>
19
20static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
21 int tos, int oif,
22 const xfrm_address_t *saddr,
23 const xfrm_address_t *daddr,
24 u32 mark)
25{
26 struct rtable *rt;
27
28 memset(fl4, 0, sizeof(*fl4));
29 fl4->daddr = daddr->a4;
30 fl4->flowi4_tos = tos;
31 fl4->flowi4_oif = l3mdev_master_ifindex_by_index(net, oif);
32 fl4->flowi4_mark = mark;
33 if (saddr)
34 fl4->saddr = saddr->a4;
35
36 fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;
37
38 rt = __ip_route_output_key(net, fl4);
39 if (!IS_ERR(rt))
40 return &rt->dst;
41
42 return ERR_CAST(rt);
43}
44
45static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif,
46 const xfrm_address_t *saddr,
47 const xfrm_address_t *daddr,
48 u32 mark)
49{
50 struct flowi4 fl4;
51
52 return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr, mark);
53}
54
55static int xfrm4_get_saddr(struct net *net, int oif,
56 xfrm_address_t *saddr, xfrm_address_t *daddr,
57 u32 mark)
58{
59 struct dst_entry *dst;
60 struct flowi4 fl4;
61
62 dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr, mark);
63 if (IS_ERR(dst))
64 return -EHOSTUNREACH;
65
66 saddr->a4 = fl4.saddr;
67 dst_release(dst);
68 return 0;
69}
70
71static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
72 const struct flowi *fl)
73{
74 struct rtable *rt = (struct rtable *)xdst->route;
75 const struct flowi4 *fl4 = &fl->u.ip4;
76
77 xdst->u.rt.rt_iif = fl4->flowi4_iif;
78
79 xdst->u.dst.dev = dev;
80 dev_hold(dev);
81
82 /* Sheit... I remember I did this right. Apparently,
83 * it was magically lost, so this code needs audit */
84 xdst->u.rt.rt_is_input = rt->rt_is_input;
85 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
86 RTCF_LOCAL);
87 xdst->u.rt.rt_type = rt->rt_type;
88 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
89 xdst->u.rt.rt_gw_family = rt->rt_gw_family;
90 if (rt->rt_gw_family == AF_INET)
91 xdst->u.rt.rt_gw4 = rt->rt_gw4;
92 else if (rt->rt_gw_family == AF_INET6)
93 xdst->u.rt.rt_gw6 = rt->rt_gw6;
94 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
95 xdst->u.rt.rt_mtu_locked = rt->rt_mtu_locked;
96 INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
97 rt_add_uncached_list(&xdst->u.rt);
98
99 return 0;
100}
101
102static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
103 struct sk_buff *skb, u32 mtu,
104 bool confirm_neigh)
105{
106 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
107 struct dst_entry *path = xdst->route;
108
109 path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh);
110}
111
112static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
113 struct sk_buff *skb)
114{
115 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
116 struct dst_entry *path = xdst->route;
117
118 path->ops->redirect(path, sk, skb);
119}
120
121static void xfrm4_dst_destroy(struct dst_entry *dst)
122{
123 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
124
125 dst_destroy_metrics_generic(dst);
126 if (xdst->u.rt.rt_uncached_list)
127 rt_del_uncached_list(&xdst->u.rt);
128 xfrm_dst_destroy(xdst);
129}
130
131static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
132 int unregister)
133{
134 if (!unregister)
135 return;
136
137 xfrm_dst_ifdown(dst, dev);
138}
139
140static struct dst_ops xfrm4_dst_ops_template = {
141 .family = AF_INET,
142 .update_pmtu = xfrm4_update_pmtu,
143 .redirect = xfrm4_redirect,
144 .cow_metrics = dst_cow_metrics_generic,
145 .destroy = xfrm4_dst_destroy,
146 .ifdown = xfrm4_dst_ifdown,
147 .local_out = __ip_local_out,
148 .gc_thresh = 32768,
149};
150
151static const struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
152 .dst_ops = &xfrm4_dst_ops_template,
153 .dst_lookup = xfrm4_dst_lookup,
154 .get_saddr = xfrm4_get_saddr,
155 .fill_dst = xfrm4_fill_dst,
156 .blackhole_route = ipv4_blackhole_route,
157};
158
159#ifdef CONFIG_SYSCTL
160static struct ctl_table xfrm4_policy_table[] = {
161 {
162 .procname = "xfrm4_gc_thresh",
163 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
164 .maxlen = sizeof(int),
165 .mode = 0644,
166 .proc_handler = proc_dointvec,
167 },
168 { }
169};
170
171static __net_init int xfrm4_net_sysctl_init(struct net *net)
172{
173 struct ctl_table *table;
174 struct ctl_table_header *hdr;
175
176 table = xfrm4_policy_table;
177 if (!net_eq(net, &init_net)) {
178 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
179 if (!table)
180 goto err_alloc;
181
182 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
183 }
184
185 hdr = register_net_sysctl(net, "net/ipv4", table);
186 if (!hdr)
187 goto err_reg;
188
189 net->ipv4.xfrm4_hdr = hdr;
190 return 0;
191
192err_reg:
193 if (!net_eq(net, &init_net))
194 kfree(table);
195err_alloc:
196 return -ENOMEM;
197}
198
199static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
200{
201 struct ctl_table *table;
202
203 if (!net->ipv4.xfrm4_hdr)
204 return;
205
206 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
207 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
208 if (!net_eq(net, &init_net))
209 kfree(table);
210}
211#else /* CONFIG_SYSCTL */
212static inline int xfrm4_net_sysctl_init(struct net *net)
213{
214 return 0;
215}
216
217static inline void xfrm4_net_sysctl_exit(struct net *net)
218{
219}
220#endif
221
222static int __net_init xfrm4_net_init(struct net *net)
223{
224 int ret;
225
226 memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template,
227 sizeof(xfrm4_dst_ops_template));
228 ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops);
229 if (ret)
230 return ret;
231
232 ret = xfrm4_net_sysctl_init(net);
233 if (ret)
234 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
235
236 return ret;
237}
238
239static void __net_exit xfrm4_net_exit(struct net *net)
240{
241 xfrm4_net_sysctl_exit(net);
242 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
243}
244
245static struct pernet_operations __net_initdata xfrm4_net_ops = {
246 .init = xfrm4_net_init,
247 .exit = xfrm4_net_exit,
248};
249
250static void __init xfrm4_policy_init(void)
251{
252 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo, AF_INET);
253}
254
255void __init xfrm4_init(void)
256{
257 xfrm4_state_init();
258 xfrm4_policy_init();
259 xfrm4_protocol_init();
260 register_pernet_subsys(&xfrm4_net_ops);
261}