[NET]: Some missed cases of dst_pmtu conversion.

net/ipv4/ip_gre.c

@@ -523,11 +523,11 @@ void ipgre_err(struct sk_buff *skb, u32 info)
 
 	/* change mtu on this route */
 	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
-		if (rel_info > skb2->dst->pmtu) {
+		if (rel_info > dst_pmtu(skb2->dst)) {
 			kfree_skb(skb2);
 			return;
 		}
-		skb2->dst->pmtu = rel_info;
+		skb2->dst->ops->update_pmtu(skb2->dst, rel_info);
 		rel_info = htonl(rel_info);
 	} else if (type == ICMP_TIME_EXCEEDED) {
 		struct ip_tunnel *t = (struct ip_tunnel*)skb2->dev->priv;

net/ipv4/ipip.c

@@ -452,11 +452,11 @@ void ipip_err(struct sk_buff *skb, u32 info)
 
 	/* change mtu on this route */
 	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
-		if (rel_info > skb2->dst->pmtu) {
+		if (rel_info > dst_pmtu(skb2->dst)) {
 			kfree_skb(skb2);
 			return;
 		}
-		skb2->dst->pmtu = rel_info;
+		skb2->dst->ops->update_pmtu(skb2->dst, rel_info);
 		rel_info = htonl(rel_info);
 	} else if (type == ICMP_TIME_EXCEEDED) {
 		struct ip_tunnel *t = (struct ip_tunnel*)skb2->dev->priv;

net/ipv4/ipmr.c

@@ -1111,7 +1111,7 @@ static inline int ipmr_forward_finish(struct sk_buff *skb)
 {
 	struct dst_entry *dst = skb->dst;
 
-	if (skb->len <= dst->pmtu)
+	if (skb->len <= dst_pmtu(dst))
 		return dst->output(skb);
 	else
 		return ip_fragment(skb, dst->output);
@@ -1167,7 +1167,7 @@ static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c,
 
 	dev = rt->u.dst.dev;
 
-	if (skb->len+encap > rt->u.dst.pmtu && (ntohs(iph->frag_off) & IP_DF)) {
+	if (skb->len+encap > dst_pmtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) {
 		/* Do not fragment multicasts. Alas, IPv4 does not
 		   allow to send ICMP, so that packets will disappear
 		   to blackhole.

net/ipv4/netfilter/ipt_TCPMSS.c

@@ -85,14 +85,14 @@ ipt_tcpmss_target(struct sk_buff **pskb,
 			return NF_DROP; /* or IPT_CONTINUE ?? */
 		}
 
-		if((*pskb)->dst->pmtu <= (sizeof(struct iphdr) + sizeof(struct tcphdr))) {
+		if(dst_pmtu((*pskb)->dst) <= (sizeof(struct iphdr) + sizeof(struct tcphdr))) {
 			if (net_ratelimit())
 				printk(KERN_ERR
-		       			"ipt_tcpmss_target: unknown or invalid path-MTU (%d)\n", (*pskb)->dst->pmtu);
+		       			"ipt_tcpmss_target: unknown or invalid path-MTU (%d)\n", dst_pmtu((*pskb)->dst));
 			return NF_DROP; /* or IPT_CONTINUE ?? */
 		}
 
-		newmss = (*pskb)->dst->pmtu - sizeof(struct iphdr) - sizeof(struct tcphdr);
+		newmss = dst_pmtu((*pskb)->dst->pmtu) - sizeof(struct iphdr) - sizeof(struct tcphdr);
 	} else
 		newmss = tcpmssinfo->mss;