diff options
Diffstat (limited to 'net/ipv6/xfrm6_input.c')
-rw-r--r-- | net/ipv6/xfrm6_input.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c new file mode 100644 index 00000000..f8c3cf84 --- /dev/null +++ b/net/ipv6/xfrm6_input.c @@ -0,0 +1,146 @@ +/* + * 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 <linux/netfilter.h> +#include <linux/netfilter_ipv6.h> +#include <net/ipv6.h> +#include <net/xfrm.h> + +int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb) +{ + return xfrm6_extract_header(skb); +} + +int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) +{ + XFRM_SPI_SKB_CB(skb)->family = AF_INET6; + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); + return xfrm_input(skb, nexthdr, spi, 0); +} +EXPORT_SYMBOL(xfrm6_rcv_spi); + +int xfrm6_transport_finish(struct sk_buff *skb, int async) +{ + skb_network_header(skb)[IP6CB(skb)->nhoff] = + XFRM_MODE_SKB_CB(skb)->protocol; + +#ifndef CONFIG_NETFILTER + if (!async) + return 1; +#endif + + ipv6_hdr(skb)->payload_len = htons(skb->len); + __skb_push(skb, skb->data - skb_network_header(skb)); + + NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, + ip6_rcv_finish); + return -1; +} + +int xfrm6_rcv(struct sk_buff *skb) +{ + return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], + 0); +} + +EXPORT_SYMBOL(xfrm6_rcv); + +int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, + xfrm_address_t *saddr, u8 proto) +{ + struct net *net = dev_net(skb->dev); + struct xfrm_state *x = NULL; + int i = 0; + + /* 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) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); + goto drop; + } + if (skb->sp) + secpath_put(skb->sp); + skb->sp = sp; + } + + if (1 + skb->sp->len == XFRM_MAX_DEPTH) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto drop; + } + + for (i = 0; i < 3; i++) { + xfrm_address_t *dst, *src; + + switch (i) { + case 0: + dst = daddr; + src = saddr; + break; + case 1: + /* lookup state with wild-card source address */ + dst = daddr; + src = (xfrm_address_t *)&in6addr_any; + break; + default: + /* lookup state with wild-card addresses */ + dst = (xfrm_address_t *)&in6addr_any; + src = (xfrm_address_t *)&in6addr_any; + break; + } + + x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6); + if (!x) + continue; + + spin_lock(&x->lock); + + if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) && + likely(x->km.state == XFRM_STATE_VALID) && + !xfrm_state_check_expire(x)) { + spin_unlock(&x->lock); + if (x->type->input(x, skb) > 0) { + /* found a valid state */ + break; + } + } else + spin_unlock(&x->lock); + + xfrm_state_put(x); + x = NULL; + } + + if (!x) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); + xfrm_audit_state_notfound_simple(skb, AF_INET6); + goto drop; + } + + skb->sp->xvec[skb->sp->len++] = x; + + spin_lock(&x->lock); + + x->curlft.bytes += skb->len; + x->curlft.packets++; + + spin_unlock(&x->lock); + + return 1; + +drop: + return -1; +} + +EXPORT_SYMBOL(xfrm6_input_addr); |