#include <linux/list.h>
#include <net/ip.h>
#include <net/xfrm.h>
+#include <net/icmp.h>
#include <net/ipv6.h>
-#include <net/protocol.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
+int xfrm6_tunnel_check_size(struct sk_buff *skb)
+{
+ int mtu, ret = 0;
+ struct dst_entry *dst = skb->dst;
+
+ mtu = dst_pmtu(dst) - sizeof(struct ipv6hdr);
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
+
+ if (skb->len > mtu) {
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
+ ret = -EMSGSIZE;
+ }
+
+ return ret;
+}
+
+EXPORT_SYMBOL(xfrm6_tunnel_check_size);
+
static int xfrm6_tunnel_output(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
- struct ipv6hdr *top_iph;
-
- top_iph = (struct ipv6hdr *)skb->data;
+ struct dst_entry *dst = skb->dst;
+ struct xfrm_state *x = dst->xfrm;
+ struct ipv6hdr *iph, *top_iph;
+ int err;
+
+ if ((err = xfrm6_tunnel_check_size(skb)) != 0)
+ goto error_nolock;
+
+ iph = skb->nh.ipv6h;
+
+ top_iph = (struct ipv6hdr *)skb_push(skb, x->props.header_len);
+ top_iph->version = 6;
+ top_iph->priority = iph->priority;
+ top_iph->flow_lbl[0] = iph->flow_lbl[0];
+ top_iph->flow_lbl[1] = iph->flow_lbl[1];
+ top_iph->flow_lbl[2] = iph->flow_lbl[2];
+ top_iph->nexthdr = IPPROTO_IPV6;
top_iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
+ top_iph->hop_limit = iph->hop_limit;
+ memcpy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr, sizeof(struct in6_addr));
+ memcpy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr, sizeof(struct in6_addr));
+ skb->nh.raw = skb->data;
+ skb->h.raw = skb->nh.raw + sizeof(struct ipv6hdr);
- return 0;
+ x->curlft.bytes += skb->len;
+ x->curlft.packets++;
+
+ spin_unlock_bh(&x->lock);
+
+ if ((skb->dst = dst_pop(dst)) == NULL) {
+ kfree_skb(skb);
+ err = -EHOSTUNREACH;
+ goto error_nolock;
+ }
+
+ return NET_XMIT_BYPASS;
+
+error_nolock:
+ kfree_skb(skb);
+ return err;
}
static int xfrm6_tunnel_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)