1 // SPDX-License-Identifier: GPL-2.0
6 * Kazunori MIYAZAWA @USAGI
7 * YOSHIFUJI Hideaki @USAGI
8 * Split up af-specific portion
12 #include <linux/err.h>
13 #include <linux/kernel.h>
14 #include <linux/inetdevice.h>
18 #include <net/l3mdev.h>
20 static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
22 const xfrm_address_t *saddr,
23 const xfrm_address_t *daddr,
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;
34 fl4->saddr = saddr->a4;
36 fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;
38 rt = __ip_route_output_key(net, fl4);
45 static 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,
52 return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr, mark);
55 static int xfrm4_get_saddr(struct net *net, int oif,
56 xfrm_address_t *saddr, xfrm_address_t *daddr,
59 struct dst_entry *dst;
62 dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr, mark);
66 saddr->a4 = fl4.saddr;
71 static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
72 const struct flowi *fl)
74 struct rtable *rt = (struct rtable *)xdst->route;
75 const struct flowi4 *fl4 = &fl->u.ip4;
77 xdst->u.rt.rt_iif = fl4->flowi4_iif;
79 xdst->u.dst.dev = dev;
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 |
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);
102 static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
103 struct sk_buff *skb, u32 mtu)
105 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
106 struct dst_entry *path = xdst->route;
108 path->ops->update_pmtu(path, sk, skb, mtu);
111 static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
114 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
115 struct dst_entry *path = xdst->route;
117 path->ops->redirect(path, sk, skb);
120 static void xfrm4_dst_destroy(struct dst_entry *dst)
122 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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);
130 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
136 xfrm_dst_ifdown(dst, dev);
139 static struct dst_ops xfrm4_dst_ops_template = {
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,
150 static 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,
159 static struct ctl_table xfrm4_policy_table[] = {
161 .procname = "xfrm4_gc_thresh",
162 .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
163 .maxlen = sizeof(int),
165 .proc_handler = proc_dointvec,
170 static __net_init int xfrm4_net_sysctl_init(struct net *net)
172 struct ctl_table *table;
173 struct ctl_table_header *hdr;
175 table = xfrm4_policy_table;
176 if (!net_eq(net, &init_net)) {
177 table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
181 table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
184 hdr = register_net_sysctl(net, "net/ipv4", table);
188 net->ipv4.xfrm4_hdr = hdr;
192 if (!net_eq(net, &init_net))
198 static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
200 struct ctl_table *table;
202 if (!net->ipv4.xfrm4_hdr)
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))
210 #else /* CONFIG_SYSCTL */
211 static inline int xfrm4_net_sysctl_init(struct net *net)
216 static inline void xfrm4_net_sysctl_exit(struct net *net)
221 static int __net_init xfrm4_net_init(struct net *net)
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);
231 ret = xfrm4_net_sysctl_init(net);
233 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
238 static void __net_exit xfrm4_net_exit(struct net *net)
240 xfrm4_net_sysctl_exit(net);
241 dst_entries_destroy(&net->xfrm.xfrm4_dst_ops);
244 static struct pernet_operations __net_initdata xfrm4_net_ops = {
245 .init = xfrm4_net_init,
246 .exit = xfrm4_net_exit,
249 static void __init xfrm4_policy_init(void)
251 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo, AF_INET);
254 void __init xfrm4_init(void)
258 xfrm4_protocol_init();
259 register_pernet_subsys(&xfrm4_net_ops);