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/*
* 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 == XFRM_MODE_TUNNEL && 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;
}
/* placeholder until ipv4's code is written */
static struct xfrm_state *
__xfrm4_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
u8 proto)
{
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);
h = __xfrm4_src_hash(saddr);
xfrm_state_hold(x0);
list_add_tail(&x0->bysrc, xfrm4_state_afinfo.state_bysrc+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,
.state_lookup_byaddr = __xfrm4_state_lookup_byaddr,
.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 */
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