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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{
105 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
106 struct dst_entry *path = xdst->route;
107
108 path->ops->update_pmtu(path, sk, skb, mtu);
109}
110
111static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
112 struct sk_buff *skb)
113{
114 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
115 struct dst_entry *path = xdst->route;
116
117 path->ops->redirect(path, sk, skb);
118}
119
120static void xfrm4_dst_destroy(struct dst_entry *dst)
121{
122 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
123
124 dst_destroy_metrics_generic(dst);
125 if (xdst->u.rt.rt_uncached_list)
126 rt_del_uncached_list(&xdst->u.rt);
127 xfrm_dst_destroy(xdst);
128}
129
130static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
131 int unregister)
132{
133 if (!unregister)
134 return;
135
136 xfrm_dst_ifdown(dst, dev);
137}
138
139static struct dst_ops xfrm4_dst_ops_template = {
140 .family = AF_INET,
141 .update_pmtu = xfrm4_update_pmtu,
142 .redirect = xfrm4_redirect,
143 .cow_metrics = dst_cow_metrics_generic,
144 .destroy = xfrm4_dst_destroy,
145 .ifdown = xfrm4_dst_ifdown,
146 .local_out = __ip_local_out,
147 .gc_thresh = 32768,
148};
149
150static const struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
151 .dst_ops = &xfrm4_dst_ops_template,
152 .dst_lookup = xfrm4_dst_lookup,
153 .get_saddr = xfrm4_get_saddr,
154 .fill_dst = xfrm4_fill_dst,
155 .blackhole_route = ipv4_blackhole_route,
156};
157
158#ifdef CONFIG_SYSCTL
159static struct ctl_table xfrm4_policy_table[] = {
160 {
161 .procname = "xfrm4_gc_thresh",
162 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
163 .maxlen = sizeof(int),
164 .mode = 0644,
165 .proc_handler = proc_dointvec,
166 },
167 { }
168};
169
170static __net_init int xfrm4_net_sysctl_init(struct net *net)
171{
172 struct ctl_table *table;
173 struct ctl_table_header *hdr;
174
175 table = xfrm4_policy_table;
176 if (!net_eq(net, &init_net)) {
177 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
178 if (!table)
179 goto err_alloc;
180
181 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
182 }
183
184 hdr = register_net_sysctl(net, "net/ipv4", table);
185 if (!hdr)
186 goto err_reg;
187
188 net->ipv4.xfrm4_hdr = hdr;
189 return 0;
190
191err_reg:
192 if (!net_eq(net, &init_net))
193 kfree(table);
194err_alloc:
195 return -ENOMEM;
196}
197
198static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
199{
200 struct ctl_table *table;
201
202 if (!net->ipv4.xfrm4_hdr)
203 return;
204
205 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
206 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
207 if (!net_eq(net, &init_net))
208 kfree(table);
209}
210#else /* CONFIG_SYSCTL */
211static inline int xfrm4_net_sysctl_init(struct net *net)
212{
213 return 0;
214}
215
216static inline void xfrm4_net_sysctl_exit(struct net *net)
217{
218}
219#endif
220
221static int __net_init xfrm4_net_init(struct net *net)
222{
223 int ret;
224
225 memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template,
226 sizeof(xfrm4_dst_ops_template));
227 ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops);
228 if (ret)
229 return ret;
230
231 ret = xfrm4_net_sysctl_init(net);
232 if (ret)
233 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
234
235 return ret;
236}
237
238static void __net_exit xfrm4_net_exit(struct net *net)
239{
240 xfrm4_net_sysctl_exit(net);
241 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
242}
243
244static struct pernet_operations __net_initdata xfrm4_net_ops = {
245 .init = xfrm4_net_init,
246 .exit = xfrm4_net_exit,
247};
248
249static void __init xfrm4_policy_init(void)
250{
251 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo, AF_INET);
252}
253
254void __init xfrm4_init(void)
255{
256 xfrm4_state_init();
257 xfrm4_policy_init();
258 xfrm4_protocol_init();
259 register_pernet_subsys(&xfrm4_net_ops);
260}
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/inet_dscp.h>
18#include <net/ip.h>
19#include <net/l3mdev.h>
20
21static struct dst_entry *__xfrm4_dst_lookup(struct flowi4 *fl4,
22 const struct xfrm_dst_lookup_params *params)
23{
24 struct rtable *rt;
25
26 memset(fl4, 0, sizeof(*fl4));
27 fl4->daddr = params->daddr->a4;
28 fl4->flowi4_tos = inet_dscp_to_dsfield(params->dscp);
29 fl4->flowi4_l3mdev = l3mdev_master_ifindex_by_index(params->net,
30 params->oif);
31 fl4->flowi4_mark = params->mark;
32 if (params->saddr)
33 fl4->saddr = params->saddr->a4;
34 fl4->flowi4_proto = params->ipproto;
35 fl4->uli = params->uli;
36
37 rt = __ip_route_output_key(params->net, fl4);
38 if (!IS_ERR(rt))
39 return &rt->dst;
40
41 return ERR_CAST(rt);
42}
43
44static struct dst_entry *xfrm4_dst_lookup(const struct xfrm_dst_lookup_params *params)
45{
46 struct flowi4 fl4;
47
48 return __xfrm4_dst_lookup(&fl4, params);
49}
50
51static int xfrm4_get_saddr(xfrm_address_t *saddr,
52 const struct xfrm_dst_lookup_params *params)
53{
54 struct dst_entry *dst;
55 struct flowi4 fl4;
56
57 dst = __xfrm4_dst_lookup(&fl4, params);
58 if (IS_ERR(dst))
59 return -EHOSTUNREACH;
60
61 saddr->a4 = fl4.saddr;
62 dst_release(dst);
63 return 0;
64}
65
66static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
67 const struct flowi *fl)
68{
69 struct rtable *rt = dst_rtable(xdst->route);
70 const struct flowi4 *fl4 = &fl->u.ip4;
71
72 xdst->u.rt.rt_iif = fl4->flowi4_iif;
73
74 xdst->u.dst.dev = dev;
75 netdev_hold(dev, &xdst->u.dst.dev_tracker, GFP_ATOMIC);
76
77 /* Sheit... I remember I did this right. Apparently,
78 * it was magically lost, so this code needs audit */
79 xdst->u.rt.rt_is_input = rt->rt_is_input;
80 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
81 RTCF_LOCAL);
82 xdst->u.rt.rt_type = rt->rt_type;
83 xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
84 xdst->u.rt.rt_gw_family = rt->rt_gw_family;
85 if (rt->rt_gw_family == AF_INET)
86 xdst->u.rt.rt_gw4 = rt->rt_gw4;
87 else if (rt->rt_gw_family == AF_INET6)
88 xdst->u.rt.rt_gw6 = rt->rt_gw6;
89 xdst->u.rt.rt_pmtu = rt->rt_pmtu;
90 xdst->u.rt.rt_mtu_locked = rt->rt_mtu_locked;
91 rt_add_uncached_list(&xdst->u.rt);
92
93 return 0;
94}
95
96static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
97 struct sk_buff *skb, u32 mtu,
98 bool confirm_neigh)
99{
100 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
101 struct dst_entry *path = xdst->route;
102
103 path->ops->update_pmtu(path, sk, skb, mtu, confirm_neigh);
104}
105
106static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
107 struct sk_buff *skb)
108{
109 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
110 struct dst_entry *path = xdst->route;
111
112 path->ops->redirect(path, sk, skb);
113}
114
115static void xfrm4_dst_destroy(struct dst_entry *dst)
116{
117 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
118
119 dst_destroy_metrics_generic(dst);
120 rt_del_uncached_list(&xdst->u.rt);
121 xfrm_dst_destroy(xdst);
122}
123
124static struct dst_ops xfrm4_dst_ops_template = {
125 .family = AF_INET,
126 .update_pmtu = xfrm4_update_pmtu,
127 .redirect = xfrm4_redirect,
128 .cow_metrics = dst_cow_metrics_generic,
129 .destroy = xfrm4_dst_destroy,
130 .ifdown = xfrm_dst_ifdown,
131 .local_out = __ip_local_out,
132 .gc_thresh = 32768,
133};
134
135static const struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
136 .dst_ops = &xfrm4_dst_ops_template,
137 .dst_lookup = xfrm4_dst_lookup,
138 .get_saddr = xfrm4_get_saddr,
139 .fill_dst = xfrm4_fill_dst,
140 .blackhole_route = ipv4_blackhole_route,
141};
142
143#ifdef CONFIG_SYSCTL
144static struct ctl_table xfrm4_policy_table[] = {
145 {
146 .procname = "xfrm4_gc_thresh",
147 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
148 .maxlen = sizeof(int),
149 .mode = 0644,
150 .proc_handler = proc_dointvec,
151 },
152};
153
154static __net_init int xfrm4_net_sysctl_init(struct net *net)
155{
156 struct ctl_table *table;
157 struct ctl_table_header *hdr;
158
159 table = xfrm4_policy_table;
160 if (!net_eq(net, &init_net)) {
161 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
162 if (!table)
163 goto err_alloc;
164
165 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
166 }
167
168 hdr = register_net_sysctl_sz(net, "net/ipv4", table,
169 ARRAY_SIZE(xfrm4_policy_table));
170 if (!hdr)
171 goto err_reg;
172
173 net->ipv4.xfrm4_hdr = hdr;
174 return 0;
175
176err_reg:
177 if (!net_eq(net, &init_net))
178 kfree(table);
179err_alloc:
180 return -ENOMEM;
181}
182
183static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
184{
185 const struct ctl_table *table;
186
187 if (!net->ipv4.xfrm4_hdr)
188 return;
189
190 table = net->ipv4.xfrm4_hdr->ctl_table_arg;
191 unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
192 if (!net_eq(net, &init_net))
193 kfree(table);
194}
195#else /* CONFIG_SYSCTL */
196static inline int xfrm4_net_sysctl_init(struct net *net)
197{
198 return 0;
199}
200
201static inline void xfrm4_net_sysctl_exit(struct net *net)
202{
203}
204#endif
205
206static int __net_init xfrm4_net_init(struct net *net)
207{
208 int ret;
209
210 memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template,
211 sizeof(xfrm4_dst_ops_template));
212 ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops);
213 if (ret)
214 return ret;
215
216 ret = xfrm4_net_sysctl_init(net);
217 if (ret)
218 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
219
220 return ret;
221}
222
223static void __net_exit xfrm4_net_exit(struct net *net)
224{
225 xfrm4_net_sysctl_exit(net);
226 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
227}
228
229static struct pernet_operations __net_initdata xfrm4_net_ops = {
230 .init = xfrm4_net_init,
231 .exit = xfrm4_net_exit,
232};
233
234static void __init xfrm4_policy_init(void)
235{
236 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo, AF_INET);
237}
238
239void __init xfrm4_init(void)
240{
241 xfrm4_state_init();
242 xfrm4_policy_init();
243 xfrm4_protocol_init();
244 register_pernet_subsys(&xfrm4_net_ops);
245}