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[linux-2.6.git] / net / ipv6 / xfrm6_state.c
1 /*
2  * xfrm6_state.c: based on xfrm4_state.c
3  *
4  * Authors:
5  *      Mitsuru KANDA @USAGI
6  *      Kazunori MIYAZAWA @USAGI
7  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8  *              IPv6 support
9  *      YOSHIFUJI Hideaki @USAGI
10  *              Split up af-specific portion
11  *      
12  */
13
14 #include <net/xfrm.h>
15 #include <linux/pfkeyv2.h>
16 #include <linux/ipsec.h>
17 #include <net/ipv6.h>
18
19 extern struct xfrm_state_afinfo xfrm6_state_afinfo;
20
21 static void
22 __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
23                      struct xfrm_tmpl *tmpl,
24                      xfrm_address_t *daddr, xfrm_address_t *saddr)
25 {
26         /* Initialize temporary selector matching only
27          * to current session. */
28         ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
29         ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src);
30         x->sel.dport = fl->fl_ip_dport;
31         x->sel.dport_mask = ~0;
32         x->sel.sport = fl->fl_ip_sport;
33         x->sel.sport_mask = ~0;
34         x->sel.prefixlen_d = 128;
35         x->sel.prefixlen_s = 128;
36         x->sel.proto = fl->proto;
37         x->sel.ifindex = fl->oif;
38         x->id = tmpl->id;
39         if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
40                 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
41         memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
42         if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
43                 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
44         x->props.mode = tmpl->mode;
45         x->props.reqid = tmpl->reqid;
46         x->props.family = AF_INET6;
47 }
48
49 static struct xfrm_state *
50 __xfrm6_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
51 {
52         unsigned h = __xfrm6_spi_hash(daddr, spi, proto);
53         struct xfrm_state *x;
54
55         list_for_each_entry(x, xfrm6_state_afinfo.state_byspi+h, byspi) {
56                 if (x->props.family == AF_INET6 &&
57                     spi == x->id.spi &&
58                     !ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
59                     proto == x->id.proto) {
60                         xfrm_state_hold(x);
61                         return x;
62                 }
63         }
64         return NULL;
65 }
66
67 static struct xfrm_state *
68 __xfrm6_find_acq(u8 mode, u32 reqid, u8 proto, 
69                  xfrm_address_t *daddr, xfrm_address_t *saddr, 
70                  int create)
71 {
72         struct xfrm_state *x, *x0;
73         unsigned h = __xfrm6_dst_hash(daddr);
74
75         x0 = NULL;
76
77         list_for_each_entry(x, xfrm6_state_afinfo.state_bydst+h, bydst) {
78                 if (x->props.family == AF_INET6 &&
79                     !ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
80                     mode == x->props.mode &&
81                     proto == x->id.proto &&
82                     !ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
83                     reqid == x->props.reqid &&
84                     x->km.state == XFRM_STATE_ACQ) {
85                             if (!x0)
86                                     x0 = x;
87                             if (x->id.spi)
88                                     continue;
89                             x0 = x;
90                             break;
91                     }
92         }
93         if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
94                 ipv6_addr_copy((struct in6_addr *)x0->sel.daddr.a6,
95                                (struct in6_addr *)daddr);
96                 ipv6_addr_copy((struct in6_addr *)x0->sel.saddr.a6,
97                                (struct in6_addr *)saddr);
98                 x0->sel.prefixlen_d = 128;
99                 x0->sel.prefixlen_s = 128;
100                 ipv6_addr_copy((struct in6_addr *)x0->props.saddr.a6,
101                                (struct in6_addr *)saddr);
102                 x0->km.state = XFRM_STATE_ACQ;
103                 ipv6_addr_copy((struct in6_addr *)x0->id.daddr.a6,
104                                (struct in6_addr *)daddr);
105                 x0->id.proto = proto;
106                 x0->props.family = AF_INET6;
107                 x0->props.mode = mode;
108                 x0->props.reqid = reqid;
109                 x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
110                 xfrm_state_hold(x0);
111                 x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
112                 add_timer(&x0->timer);
113                 xfrm_state_hold(x0);
114                 list_add_tail(&x0->bydst, xfrm6_state_afinfo.state_bydst+h);
115                 wake_up(&km_waitq);
116         }
117         if (x0)
118                 xfrm_state_hold(x0);
119         return x0;
120 }
121
122 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
123         .family                 = AF_INET6,
124         .lock                   = RW_LOCK_UNLOCKED,
125         .init_tempsel           = __xfrm6_init_tempsel,
126         .state_lookup           = __xfrm6_state_lookup,
127         .find_acq               = __xfrm6_find_acq,
128 };
129
130 void __init xfrm6_state_init(void)
131 {
132         xfrm_state_register_afinfo(&xfrm6_state_afinfo);
133 }
134
135 void __exit xfrm6_state_fini(void)
136 {
137         xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
138 }
139