aboutsummaryrefslogtreecommitdiff
path: root/net/ipv6/xfrm6_input.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv6/xfrm6_input.c')
-rw-r--r--net/ipv6/xfrm6_input.c150
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 00000000000..28c29d78338
--- /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);
+}