1 /*
2 * xfrm4_state.c
3 *
4 * Changes:
5 * YOSHIFUJI Hideaki @USAGI
6 * Split up af-specific portion
7 *
8 */
9
10 #include <net/xfrm.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/ipsec.h>
13
14 static struct xfrm_state_afinfo xfrm4_state_afinfo;
15
16 static void
17 __xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
18 struct xfrm_tmpl *tmpl,
19 xfrm_address_t *daddr, xfrm_address_t *saddr)
20 {
21 x->sel.daddr.a4 = fl->fl4_dst;
22 x->sel.saddr.a4 = fl->fl4_src;
23 x->sel.dport = fl->fl_ip_dport;
24 x->sel.dport_mask = ~0;
25 x->sel.sport = fl->fl_ip_sport;
26 x->sel.sport_mask = ~0;
27 x->sel.prefixlen_d = 32;
28 x->sel.prefixlen_s = 32;
29 x->sel.proto = fl->proto;
30 x->sel.ifindex = fl->oif;
31 x->id = tmpl->id;
32 if (x->id.daddr.a4 == 0)
33 x->id.daddr.a4 = daddr->a4;
34 x->props.saddr = tmpl->saddr;
35 if (x->props.saddr.a4 == 0)
36 x->props.saddr.a4 = saddr->a4;
37 x->props.mode = tmpl->mode;
38 x->props.reqid = tmpl->reqid;
39 x->props.family = AF_INET;
40 }
41
42 static struct xfrm_state *
43 __xfrm4_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
44 {
45 unsigned h = __xfrm4_spi_hash(daddr, spi, proto);
46 struct xfrm_state *x;
47
48 list_for_each_entry(x, xfrm4_state_afinfo.state_byspi+h, byspi) {
49 if (x->props.family == AF_INET &&
50 spi == x->id.spi &&
51 daddr->a4 == x->id.daddr.a4 &&
52 proto == x->id.proto) {
53 xfrm_state_hold(x);
54 return x;
55 }
56 }
57 return NULL;
58 }
59
60 static struct xfrm_state *
61 __xfrm4_find_acq(u8 mode, u32 reqid, u8 proto,
62 xfrm_address_t *daddr, xfrm_address_t *saddr,
63 int create)
64 {
65 struct xfrm_state *x, *x0;
66 unsigned h = __xfrm4_dst_hash(daddr);
67
68 x0 = NULL;
69
70 list_for_each_entry(x, xfrm4_state_afinfo.state_bydst+h, bydst) {
71 if (x->props.family == AF_INET &&
72 daddr->a4 == x->id.daddr.a4 &&
73 mode == x->props.mode &&
74 proto == x->id.proto &&
75 saddr->a4 == x->props.saddr.a4 &&
76 reqid == x->props.reqid &&
77 x->km.state == XFRM_STATE_ACQ &&
78 !x->id.spi) {
79 x0 = x;
80 break;
81 }
82 }
83 if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
84 x0->sel.daddr.a4 = daddr->a4;
85 x0->sel.saddr.a4 = saddr->a4;
86 x0->sel.prefixlen_d = 32;
87 x0->sel.prefixlen_s = 32;
88 x0->props.saddr.a4 = saddr->a4;
89 x0->km.state = XFRM_STATE_ACQ;
90 x0->id.daddr.a4 = daddr->a4;
91 x0->id.proto = proto;
92 x0->props.family = AF_INET;
93 x0->props.mode = mode;
94 x0->props.reqid = reqid;
95 x0->props.family = AF_INET;
96 x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
97 xfrm_state_hold(x0);
98 x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
99 add_timer(&x0->timer);
100 xfrm_state_hold(x0);
101 list_add_tail(&x0->bydst, xfrm4_state_afinfo.state_bydst+h);
102 wake_up(&km_waitq);
103 }
104 if (x0)
105 xfrm_state_hold(x0);
106 return x0;
107 }
108
109 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
110 .family = AF_INET,
111 .lock = RW_LOCK_UNLOCKED,
112 .init_tempsel = __xfrm4_init_tempsel,
113 .state_lookup = __xfrm4_state_lookup,
114 .find_acq = __xfrm4_find_acq,
115 };
116
117 void __init xfrm4_state_init(void)
118 {
119 xfrm_state_register_afinfo(&xfrm4_state_afinfo);
120 }
121
122 void __exit xfrm4_state_fini(void)
123 {
124 xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
125 }
126
127
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