Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * xfrm4_state.c | |
3 | * | |
4 | * Changes: | |
5 | * YOSHIFUJI Hideaki @USAGI | |
6 | * Split up af-specific portion | |
7 | * | |
8 | */ | |
9 | ||
dd87147e | 10 | #include <net/ip.h> |
1da177e4 LT |
11 | #include <net/xfrm.h> |
12 | #include <linux/pfkeyv2.h> | |
13 | #include <linux/ipsec.h> | |
14 | ||
15 | static struct xfrm_state_afinfo xfrm4_state_afinfo; | |
16 | ||
dd87147e HX |
17 | static 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 | ||
1da177e4 LT |
24 | static 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; | |
ee51b1b6 PM |
45 | 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 | } | |
1da177e4 LT |
60 | x->props.mode = tmpl->mode; |
61 | x->props.reqid = tmpl->reqid; | |
62 | x->props.family = AF_INET; | |
63 | } | |
64 | ||
65 | static 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 | ||
83 | static 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 | ||
132 | static struct xfrm_state_afinfo xfrm4_state_afinfo = { | |
133 | .family = AF_INET, | |
dd87147e | 134 | .init_flags = xfrm4_init_flags, |
1da177e4 LT |
135 | .init_tempsel = __xfrm4_init_tempsel, |
136 | .state_lookup = __xfrm4_state_lookup, | |
137 | .find_acq = __xfrm4_find_acq, | |
138 | }; | |
139 | ||
140 | void __init xfrm4_state_init(void) | |
141 | { | |
142 | xfrm_state_register_afinfo(&xfrm4_state_afinfo); | |
143 | } | |
144 | ||
0742fd53 | 145 | #if 0 |
1da177e4 LT |
146 | void __exit xfrm4_state_fini(void) |
147 | { | |
148 | xfrm_state_unregister_afinfo(&xfrm4_state_afinfo); | |
149 | } | |
0742fd53 | 150 | #endif /* 0 */ |
1da177e4 | 151 |