diff options
Diffstat (limited to 'net/ipv6/xfrm6_input.c')
| -rw-r--r-- | net/ipv6/xfrm6_input.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c new file mode 100644 index 000000000000..28c29d78338e --- /dev/null +++ b/net/ipv6/xfrm6_input.c @@ -0,0 +1,150 @@ +/* + * 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); +} |