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/*
* xfrm6_state.c: based on xfrm4_state.c
*
* Authors:
* Mitsuru KANDA @USAGI
* Kazunori MIYAZAWA @USAGI
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
* IPv6 support
* YOSHIFUJI Hideaki @USAGI
* Split up af-specific portion
*
*/
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
static struct xfrm_state_afinfo xfrm6_state_afinfo;
static void
__xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
struct xfrm_tmpl *tmpl,
xfrm_address_t *daddr, xfrm_address_t *saddr)
{
/* Initialize temporary selector matching only
* to current session. */
ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_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 = 128;
x->sel.prefixlen_s = 128;
x->sel.proto = fl->proto;
x->sel.ifindex = fl->oif;
x->id = tmpl->id;
if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
if (tmpl->mode == XFRM_MODE_TUNNEL && ipv6_addr_any((struct in6_addr*)&x->props.saddr)) {
struct rt6_info *rt;
struct flowi fl_tunnel = {
.nl_u = {
.ip6_u = {
.daddr = *(struct in6_addr *)daddr,
}
}
};
if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
&fl_tunnel, AF_INET6)) {
ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)daddr,
(struct in6_addr *)&x->props.saddr);
dst_release(&rt->u.dst);
}
}
x->props.mode = tmpl->mode;
x->props.reqid = tmpl->reqid;
x->props.family = AF_INET6;
}
static struct xfrm_state *
__xfrm6_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
u8 proto)
{
struct xfrm_state *x = NULL;
unsigned h;
h = __xfrm6_src_hash(saddr);
list_for_each_entry(x, xfrm6_state_afinfo.state_bysrc+h, bysrc) {
if (x->props.family == AF_INET6 &&
ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
proto == x->id.proto) {
xfrm_state_hold(x);
return x;
}
}
return NULL;
}
static struct xfrm_state *
__xfrm6_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
{
unsigned h = __xfrm6_spi_hash(daddr, spi, proto);
struct xfrm_state *x;
list_for_each_entry(x, xfrm6_state_afinfo.state_byspi+h, byspi) {
if (x->props.family == AF_INET6 &&
spi == x->id.spi &&
ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
proto == x->id.proto) {
xfrm_state_hold(x);
return x;
}
}
return NULL;
}
static struct xfrm_state *
__xfrm6_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 = __xfrm6_dst_hash(daddr);
x0 = NULL;
list_for_each_entry(x, xfrm6_state_afinfo.state_bydst+h, bydst) {
if (x->props.family == AF_INET6 &&
ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
mode == x->props.mode &&
proto == x->id.proto &&
ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
reqid == x->props.reqid &&
x->km.state == XFRM_STATE_ACQ &&
!x->id.spi) {
x0 = x;
break;
}
}
if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
ipv6_addr_copy((struct in6_addr *)x0->sel.daddr.a6,
(struct in6_addr *)daddr);
ipv6_addr_copy((struct in6_addr *)x0->sel.saddr.a6,
(struct in6_addr *)saddr);
x0->sel.prefixlen_d = 128;
x0->sel.prefixlen_s = 128;
ipv6_addr_copy((struct in6_addr *)x0->props.saddr.a6,
(struct in6_addr *)saddr);
x0->km.state = XFRM_STATE_ACQ;
ipv6_addr_copy((struct in6_addr *)x0->id.daddr.a6,
(struct in6_addr *)daddr);
x0->id.proto = proto;
x0->props.family = AF_INET6;
x0->props.mode = mode;
x0->props.reqid = reqid;
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, xfrm6_state_afinfo.state_bydst+h);
h = __xfrm6_src_hash(saddr);
xfrm_state_hold(x0);
list_add_tail(&x0->bysrc, xfrm6_state_afinfo.state_bysrc+h);
wake_up(&km_waitq);
}
if (x0)
xfrm_state_hold(x0);
return x0;
}
static struct xfrm_state_afinfo xfrm6_state_afinfo = {
.family = AF_INET6,
.init_tempsel = __xfrm6_init_tempsel,
.state_lookup = __xfrm6_state_lookup,
.state_lookup_byaddr = __xfrm6_state_lookup_byaddr,
.find_acq = __xfrm6_find_acq,
};
void __init xfrm6_state_init(void)
{
xfrm_state_register_afinfo(&xfrm6_state_afinfo);
}
void xfrm6_state_fini(void)
{
xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
}
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