summaryrefslogtreecommitdiffstats
path: root/net/ipv4/xfrm4_state.c
blob: 81e1751c966e1008256d01bfc845588038147523 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 * xfrm4_state.c
 *
 * Changes:
 * 	YOSHIFUJI Hideaki @USAGI
 * 		Split up af-specific portion
 *
 */

#include <net/ip.h>
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>

static struct xfrm_state_afinfo xfrm4_state_afinfo;

static int xfrm4_init_flags(struct xfrm_state *x)
{
	if (ipv4_config.no_pmtu_disc)
		x->props.flags |= XFRM_STATE_NOPMTUDISC;
	return 0;
}

static void
__xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
		     struct xfrm_tmpl *tmpl,
		     xfrm_address_t *daddr, xfrm_address_t *saddr)
{
	x->sel.daddr.a4 = fl->fl4_dst;
	x->sel.saddr.a4 = fl->fl4_src;
	x->sel.dport = xfrm_flowi_dport(fl);
	x->sel.dport_mask = ~0;
	x->sel.sport = xfrm_flowi_sport(fl);
	x->sel.sport_mask = ~0;
	x->sel.prefixlen_d = 32;
	x->sel.prefixlen_s = 32;
	x->sel.proto = fl->proto;
	x->sel.ifindex = fl->oif;
	x->id = tmpl->id;
	if (x->id.daddr.a4 == 0)
		x->id.daddr.a4 = daddr->a4;
	x->props.saddr = tmpl->saddr;
	if (x->props.saddr.a4 == 0)
		x->props.saddr.a4 = saddr->a4;
	if (tmpl->mode && x->props.saddr.a4 == 0) {
		struct rtable *rt;
	        struct flowi fl_tunnel = {
        	        .nl_u = {
        			.ip4_u = {
					.daddr = x->id.daddr.a4,
				}
			}
		};
		if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
		                     &fl_tunnel, AF_INET)) {
			x->props.saddr.a4 = rt->rt_src;
			dst_release(&rt->u.dst);
		}
	}
	x->props.mode = tmpl->mode;
	x->props.reqid = tmpl->reqid;
	x->props.family = AF_INET;
}

static struct xfrm_state *
__xfrm4_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
{
	unsigned h = __xfrm4_spi_hash(daddr, spi, proto);
	struct xfrm_state *x;

	list_for_each_entry(x, xfrm4_state_afinfo.state_byspi+h, byspi) {
		if (x->props.family == AF_INET &&
		    spi == x->id.spi &&
		    daddr->a4 == x->id.daddr.a4 &&
		    proto == x->id.proto) {
			xfrm_state_hold(x);
			return x;
		}
	}
	return NULL;
}

static struct xfrm_state *
__xfrm4_find_acq(u8 mode, u32 reqid, u8 proto, 
		 xfrm_address_t *daddr, xfrm_address_t *saddr, 
		 int create)
{
	struct xfrm_state *x, *x0;
	unsigned h = __xfrm4_dst_hash(daddr);

	x0 = NULL;

	list_for_each_entry(x, xfrm4_state_afinfo.state_bydst+h, bydst) {
		if (x->props.family == AF_INET &&
		    daddr->a4 == x->id.daddr.a4 &&
		    mode == x->props.mode &&
		    proto == x->id.proto &&
		    saddr->a4 == x->props.saddr.a4 &&
		    reqid == x->props.reqid &&
		    x->km.state == XFRM_STATE_ACQ &&
		    !x->id.spi) {
			    x0 = x;
			    break;
		    }
	}
	if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
		x0->sel.daddr.a4 = daddr->a4;
		x0->sel.saddr.a4 = saddr->a4;
		x0->sel.prefixlen_d = 32;
		x0->sel.prefixlen_s = 32;
		x0->props.saddr.a4 = saddr->a4;
		x0->km.state = XFRM_STATE_ACQ;
		x0->id.daddr.a4 = daddr->a4;
		x0->id.proto = proto;
		x0->props.family = AF_INET;
		x0->props.mode = mode;
		x0->props.reqid = reqid;
		x0->props.family = AF_INET;
		x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
		xfrm_state_hold(x0);
		x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
		add_timer(&x0->timer);
		xfrm_state_hold(x0);
		list_add_tail(&x0->bydst, xfrm4_state_afinfo.state_bydst+h);
		wake_up(&km_waitq);
	}
	if (x0)
		xfrm_state_hold(x0);
	return x0;
}

static struct xfrm_state_afinfo xfrm4_state_afinfo = {
	.family			= AF_INET,
	.init_flags		= xfrm4_init_flags,
	.init_tempsel		= __xfrm4_init_tempsel,
	.state_lookup		= __xfrm4_state_lookup,
	.find_acq		= __xfrm4_find_acq,
};

void __init xfrm4_state_init(void)
{
	xfrm_state_register_afinfo(&xfrm4_state_afinfo);
}

#if 0
void __exit xfrm4_state_fini(void)
{
	xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
}
#endif  /*  0  */