blob: dbabf81a9b7b4d19389c8d85e3b686026e33dd33 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * xfrm4_state.c
3 *
4 * Changes:
5 * YOSHIFUJI Hideaki @USAGI
6 * Split up af-specific portion
7 *
8 */
9
Herbert Xudd871472005-06-20 13:21:43 -070010#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <net/xfrm.h>
12#include <linux/pfkeyv2.h>
13#include <linux/ipsec.h>
14
15static struct xfrm_state_afinfo xfrm4_state_afinfo;
16
Herbert Xudd871472005-06-20 13:21:43 -070017static int xfrm4_init_flags(struct xfrm_state *x)
18{
19 if (ipv4_config.no_pmtu_disc)
20 x->props.flags |= XFRM_STATE_NOPMTUDISC;
21 return 0;
22}
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024static void
25__xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
26 struct xfrm_tmpl *tmpl,
27 xfrm_address_t *daddr, xfrm_address_t *saddr)
28{
29 x->sel.daddr.a4 = fl->fl4_dst;
30 x->sel.saddr.a4 = fl->fl4_src;
31 x->sel.dport = xfrm_flowi_dport(fl);
32 x->sel.dport_mask = ~0;
33 x->sel.sport = xfrm_flowi_sport(fl);
34 x->sel.sport_mask = ~0;
35 x->sel.prefixlen_d = 32;
36 x->sel.prefixlen_s = 32;
37 x->sel.proto = fl->proto;
38 x->sel.ifindex = fl->oif;
39 x->id = tmpl->id;
40 if (x->id.daddr.a4 == 0)
41 x->id.daddr.a4 = daddr->a4;
42 x->props.saddr = tmpl->saddr;
43 if (x->props.saddr.a4 == 0)
44 x->props.saddr.a4 = saddr->a4;
Patrick McHardyee51b1b2006-01-13 14:34:36 -080045 if (tmpl->mode && x->props.saddr.a4 == 0) {
46 struct rtable *rt;
47 struct flowi fl_tunnel = {
48 .nl_u = {
49 .ip4_u = {
50 .daddr = x->id.daddr.a4,
51 }
52 }
53 };
54 if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
55 &fl_tunnel, AF_INET)) {
56 x->props.saddr.a4 = rt->rt_src;
57 dst_release(&rt->u.dst);
58 }
59 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 x->props.mode = tmpl->mode;
61 x->props.reqid = tmpl->reqid;
62 x->props.family = AF_INET;
63}
64
65static struct xfrm_state *
66__xfrm4_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
67{
68 unsigned h = __xfrm4_spi_hash(daddr, spi, proto);
69 struct xfrm_state *x;
70
71 list_for_each_entry(x, xfrm4_state_afinfo.state_byspi+h, byspi) {
72 if (x->props.family == AF_INET &&
73 spi == x->id.spi &&
74 daddr->a4 == x->id.daddr.a4 &&
75 proto == x->id.proto) {
76 xfrm_state_hold(x);
77 return x;
78 }
79 }
80 return NULL;
81}
82
83static struct xfrm_state *
84__xfrm4_find_acq(u8 mode, u32 reqid, u8 proto,
85 xfrm_address_t *daddr, xfrm_address_t *saddr,
86 int create)
87{
88 struct xfrm_state *x, *x0;
89 unsigned h = __xfrm4_dst_hash(daddr);
90
91 x0 = NULL;
92
93 list_for_each_entry(x, xfrm4_state_afinfo.state_bydst+h, bydst) {
94 if (x->props.family == AF_INET &&
95 daddr->a4 == x->id.daddr.a4 &&
96 mode == x->props.mode &&
97 proto == x->id.proto &&
98 saddr->a4 == x->props.saddr.a4 &&
99 reqid == x->props.reqid &&
100 x->km.state == XFRM_STATE_ACQ &&
101 !x->id.spi) {
102 x0 = x;
103 break;
104 }
105 }
106 if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
107 x0->sel.daddr.a4 = daddr->a4;
108 x0->sel.saddr.a4 = saddr->a4;
109 x0->sel.prefixlen_d = 32;
110 x0->sel.prefixlen_s = 32;
111 x0->props.saddr.a4 = saddr->a4;
112 x0->km.state = XFRM_STATE_ACQ;
113 x0->id.daddr.a4 = daddr->a4;
114 x0->id.proto = proto;
115 x0->props.family = AF_INET;
116 x0->props.mode = mode;
117 x0->props.reqid = reqid;
118 x0->props.family = AF_INET;
119 x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
120 xfrm_state_hold(x0);
121 x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
122 add_timer(&x0->timer);
123 xfrm_state_hold(x0);
124 list_add_tail(&x0->bydst, xfrm4_state_afinfo.state_bydst+h);
125 wake_up(&km_waitq);
126 }
127 if (x0)
128 xfrm_state_hold(x0);
129 return x0;
130}
131
132static struct xfrm_state_afinfo xfrm4_state_afinfo = {
133 .family = AF_INET,
134 .lock = RW_LOCK_UNLOCKED,
Herbert Xudd871472005-06-20 13:21:43 -0700135 .init_flags = xfrm4_init_flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 .init_tempsel = __xfrm4_init_tempsel,
137 .state_lookup = __xfrm4_state_lookup,
138 .find_acq = __xfrm4_find_acq,
139};
140
141void __init xfrm4_state_init(void)
142{
143 xfrm_state_register_afinfo(&xfrm4_state_afinfo);
144}
145
Adrian Bunk0742fd52005-08-09 19:35:47 -0700146#if 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147void __exit xfrm4_state_fini(void)
148{
149 xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
150}
Adrian Bunk0742fd52005-08-09 19:35:47 -0700151#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152