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1da177e4 LT |
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 | static 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 = xfrm_flowi_dport(fl); | |
31 | x->sel.dport_mask = ~0; | |
32 | x->sel.sport = xfrm_flowi_sport(fl); | |
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_equal((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_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) && | |
80 | mode == x->props.mode && | |
81 | proto == x->id.proto && | |
82 | ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) && | |
83 | reqid == x->props.reqid && | |
84 | x->km.state == XFRM_STATE_ACQ && | |
85 | !x->id.spi) { | |
86 | x0 = x; | |
87 | break; | |
88 | } | |
89 | } | |
90 | if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) { | |
91 | ipv6_addr_copy((struct in6_addr *)x0->sel.daddr.a6, | |
92 | (struct in6_addr *)daddr); | |
93 | ipv6_addr_copy((struct in6_addr *)x0->sel.saddr.a6, | |
94 | (struct in6_addr *)saddr); | |
95 | x0->sel.prefixlen_d = 128; | |
96 | x0->sel.prefixlen_s = 128; | |
97 | ipv6_addr_copy((struct in6_addr *)x0->props.saddr.a6, | |
98 | (struct in6_addr *)saddr); | |
99 | x0->km.state = XFRM_STATE_ACQ; | |
100 | ipv6_addr_copy((struct in6_addr *)x0->id.daddr.a6, | |
101 | (struct in6_addr *)daddr); | |
102 | x0->id.proto = proto; | |
103 | x0->props.family = AF_INET6; | |
104 | x0->props.mode = mode; | |
105 | x0->props.reqid = reqid; | |
106 | x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
107 | xfrm_state_hold(x0); | |
108 | x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
109 | add_timer(&x0->timer); | |
110 | xfrm_state_hold(x0); | |
111 | list_add_tail(&x0->bydst, xfrm6_state_afinfo.state_bydst+h); | |
112 | wake_up(&km_waitq); | |
113 | } | |
114 | if (x0) | |
115 | xfrm_state_hold(x0); | |
116 | return x0; | |
117 | } | |
118 | ||
119 | static struct xfrm_state_afinfo xfrm6_state_afinfo = { | |
120 | .family = AF_INET6, | |
121 | .lock = RW_LOCK_UNLOCKED, | |
122 | .init_tempsel = __xfrm6_init_tempsel, | |
123 | .state_lookup = __xfrm6_state_lookup, | |
124 | .find_acq = __xfrm6_find_acq, | |
125 | }; | |
126 | ||
127 | void __init xfrm6_state_init(void) | |
128 | { | |
129 | xfrm_state_register_afinfo(&xfrm6_state_afinfo); | |
130 | } | |
131 | ||
132 | void xfrm6_state_fini(void) | |
133 | { | |
134 | xfrm_state_unregister_afinfo(&xfrm6_state_afinfo); | |
135 | } | |
136 |