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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 <linux/netfilter_ipv6.h>
#include <net/dsfield.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 = htons(0xffff);
x->sel.sport = xfrm_flowi_sport(fl);
x->sel.sport_mask = htons(0xffff);
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));
x->props.mode = tmpl->mode;
x->props.reqid = tmpl->reqid;
x->props.family = AF_INET6;
}
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 */
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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 ||
src[i]->props.mode == XFRM_MODE_BEET)) {
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 */
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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 ||
src[i]->mode == XFRM_MODE_BEET)) {
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;
}
int xfrm6_extract_header(struct sk_buff *skb)
{
struct ipv6hdr *iph = ipv6_hdr(skb);
XFRM_MODE_SKB_CB(skb)->id = 0;
XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
XFRM_MODE_SKB_CB(skb)->protocol =
skb_network_header(skb)[IP6CB(skb)->nhoff];
memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
return 0;
}
static struct xfrm_state_afinfo xfrm6_state_afinfo = {
.family = AF_INET6,
.proto = IPPROTO_IPV6,
.eth_proto = htons(ETH_P_IPV6),
.nf_post_routing = NF_IP6_POST_ROUTING,
.owner = THIS_MODULE,
.init_tempsel = __xfrm6_init_tempsel,
.tmpl_sort = __xfrm6_tmpl_sort,
.state_sort = __xfrm6_state_sort,
.output = xfrm6_output,
.extract_input = xfrm6_extract_input,
.extract_output = xfrm6_extract_output,
};
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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