151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/*
|
|
* xfrm6_input.c: based on net/ipv4/xfrm4_input.c
|
|
*
|
|
* Authors:
|
|
* Mitsuru KANDA @USAGI
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
|
|
* YOSHIFUJI Hideaki @USAGI
|
|
* IPv6 support
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <net/dsfield.h>
|
|
#include <net/inet_ecn.h>
|
|
#include <net/ip.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/xfrm.h>
|
|
|
|
static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *outer_iph = skb->nh.ipv6h;
|
|
struct ipv6hdr *inner_iph = skb->h.ipv6h;
|
|
|
|
if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph)))
|
|
IP6_ECN_set_ce(inner_iph);
|
|
}
|
|
|
|
int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi)
|
|
{
|
|
struct sk_buff *skb = *pskb;
|
|
int err;
|
|
u32 seq;
|
|
struct sec_decap_state xfrm_vec[XFRM_MAX_DEPTH];
|
|
struct xfrm_state *x;
|
|
int xfrm_nr = 0;
|
|
int decaps = 0;
|
|
int nexthdr;
|
|
unsigned int nhoff;
|
|
|
|
nhoff = *nhoffp;
|
|
nexthdr = skb->nh.raw[nhoff];
|
|
|
|
seq = 0;
|
|
if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
|
|
goto drop;
|
|
|
|
do {
|
|
struct ipv6hdr *iph = skb->nh.ipv6h;
|
|
|
|
if (xfrm_nr == XFRM_MAX_DEPTH)
|
|
goto drop;
|
|
|
|
x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, nexthdr, AF_INET6);
|
|
if (x == NULL)
|
|
goto drop;
|
|
spin_lock(&x->lock);
|
|
if (unlikely(x->km.state != XFRM_STATE_VALID))
|
|
goto drop_unlock;
|
|
|
|
if (x->props.replay_window && xfrm_replay_check(x, seq))
|
|
goto drop_unlock;
|
|
|
|
if (xfrm_state_check_expire(x))
|
|
goto drop_unlock;
|
|
|
|
nexthdr = x->type->input(x, &(xfrm_vec[xfrm_nr].decap), skb);
|
|
if (nexthdr <= 0)
|
|
goto drop_unlock;
|
|
|
|
skb->nh.raw[nhoff] = nexthdr;
|
|
|
|
if (x->props.replay_window)
|
|
xfrm_replay_advance(x, seq);
|
|
|
|
x->curlft.bytes += skb->len;
|
|
x->curlft.packets++;
|
|
|
|
spin_unlock(&x->lock);
|
|
|
|
xfrm_vec[xfrm_nr++].xvec = x;
|
|
|
|
if (x->props.mode) { /* XXX */
|
|
if (nexthdr != IPPROTO_IPV6)
|
|
goto drop;
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
goto drop;
|
|
if (skb_cloned(skb) &&
|
|
pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
|
|
goto drop;
|
|
if (x->props.flags & XFRM_STATE_DECAP_DSCP)
|
|
ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
|
|
if (!(x->props.flags & XFRM_STATE_NOECN))
|
|
ipip6_ecn_decapsulate(skb);
|
|
skb->mac.raw = memmove(skb->data - skb->mac_len,
|
|
skb->mac.raw, skb->mac_len);
|
|
skb->nh.raw = skb->data;
|
|
decaps = 1;
|
|
break;
|
|
}
|
|
|
|
if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
|
|
goto drop;
|
|
} while (!err);
|
|
|
|
/* Allocate new secpath or COW existing one. */
|
|
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
|
|
struct sec_path *sp;
|
|
sp = secpath_dup(skb->sp);
|
|
if (!sp)
|
|
goto drop;
|
|
if (skb->sp)
|
|
secpath_put(skb->sp);
|
|
skb->sp = sp;
|
|
}
|
|
|
|
if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
|
|
goto drop;
|
|
|
|
memcpy(skb->sp->x+skb->sp->len, xfrm_vec, xfrm_nr*sizeof(struct sec_decap_state));
|
|
skb->sp->len += xfrm_nr;
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
if (decaps) {
|
|
if (!(skb->dev->flags&IFF_LOOPBACK)) {
|
|
dst_release(skb->dst);
|
|
skb->dst = NULL;
|
|
}
|
|
netif_rx(skb);
|
|
return -1;
|
|
} else {
|
|
return 1;
|
|
}
|
|
|
|
drop_unlock:
|
|
spin_unlock(&x->lock);
|
|
xfrm_state_put(x);
|
|
drop:
|
|
while (--xfrm_nr >= 0)
|
|
xfrm_state_put(xfrm_vec[xfrm_nr].xvec);
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
EXPORT_SYMBOL(xfrm6_rcv_spi);
|
|
|
|
int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
|
|
{
|
|
return xfrm6_rcv_spi(pskb, nhoffp, 0);
|
|
}
|