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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 int
__xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
{
int i;
int j = 0;
/* Rule 1: select IPsec transport except AH */
for (i = 0; i < n; i++) {
if (src[i]->props.mode == XFRM_MODE_TRANSPORT &&
src[i]->id.proto != IPPROTO_AH) {
dst[j++] = src[i];
src[i] = NULL;
}
}
if (j == n)
goto end;
/* Rule 2: select MIPv6 RO or inbound trigger */
#ifdef CONFIG_IPV6_MIP6
for (i = 0; i < n; i++) {
if (src[i] &&
(src[i]->props.mode == XFRM_MODE_ROUTEOPTIMIZATION ||
src[i]->props.mode == XFRM_MODE_IN_TRIGGER)) {
dst[j++] = src[i];
src[i] = NULL;
}
}
if (j == n)
goto end;
#endif
/* Rule 3: select IPsec transport AH */
for (i = 0; i < n; i++) {
if (src[i] &&
src[i]->props.mode == XFRM_MODE_TRANSPORT &&
src[i]->id.proto == IPPROTO_AH) {
dst[j++] = src[i];
src[i] = NULL;
}
}
if (j == n)
goto end;
/* Rule 4: select IPsec tunnel */
for (i = 0; i < n; i++) {
if (src[i] &&
src[i]->props.mode == XFRM_MODE_TUNNEL) {
dst[j++] = src[i];
src[i] = NULL;
}
}
if (likely(j == n))
goto end;
/* Final rule */
for (i = 0; i < n; i++) {
if (src[i]) {
dst[j++] = src[i];
src[i] = NULL;
}
}
end:
return 0;
}
static int
__xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
{
int i;
int j = 0;
/* Rule 1: select IPsec transport */
for (i = 0; i < n; i++) {
if (src[i]->mode == XFRM_MODE_TRANSPORT) {
dst[j++] = src[i];
src[i] = NULL;
}
}
if (j == n)
goto end;
/* Rule 2: select MIPv6 RO or inbound trigger */
#ifdef CONFIG_IPV6_MIP6
for (i = 0; i < n; i++) {
if (src[i] &&
(src[i]->mode == XFRM_MODE_ROUTEOPTIMIZATION ||
src[i]->mode == XFRM_MODE_IN_TRIGGER)) {
dst[j++] = src[i];
src[i] = NULL;
}
}
if (j == n)
goto end;
#endif
/* Rule 3: select IPsec tunnel */
for (i = 0; i < n; i++) {
if (src[i] &&
src[i]->mode == XFRM_MODE_TUNNEL) {
dst[j++] = src[i];
src[i] = NULL;
}
}
if (likely(j == n))
goto end;
/* Final rule */
for (i = 0; i < n; i++) {
if (src[i]) {
dst[j++] = src[i];
src[i] = NULL;
}
}
end:
return 0;
}
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,
.tmpl_sort = __xfrm6_tmpl_sort,
.state_sort = __xfrm6_state_sort,
};
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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