X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fipv4%2Fnetfilter%2Fipt_REJECT.c;h=c9cad23844d79cca6b453551f4a891ac7aed0ac7;hb=ba7808eac17360dda459f82222859b0e3879854b;hp=fd0c05efed8a088ead0dc29ca1e08a05147a9e22;hpb=82965addad66fce61a92c5f03104ea90b0b87124;p=linux-2.6

diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c
index fd0c05efed..c9cad23844 100644
--- a/net/ipv4/netfilter/ipt_REJECT.c
+++ b/net/ipv4/netfilter/ipt_REJECT.c
@@ -38,76 +38,16 @@ MODULE_DESCRIPTION("iptables REJECT target module");
 #define DEBUGP(format, args...)
 #endif
 
-static inline struct rtable *route_reverse(struct sk_buff *skb, 
-					   struct tcphdr *tcph, int hook)
-{
-	struct iphdr *iph = skb->nh.iph;
-	struct dst_entry *odst;
-	struct flowi fl = {};
-	struct rtable *rt;
-
-	/* We don't require ip forwarding to be enabled to be able to
-	 * send a RST reply for bridged traffic. */
-	if (hook != NF_IP_FORWARD
-#ifdef CONFIG_BRIDGE_NETFILTER
-	    || (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED)
-#endif
-	   ) {
-		fl.nl_u.ip4_u.daddr = iph->saddr;
-		if (hook == NF_IP_LOCAL_IN)
-			fl.nl_u.ip4_u.saddr = iph->daddr;
-		fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
-
-		if (ip_route_output_key(&rt, &fl) != 0)
-			return NULL;
-	} else {
-		/* non-local src, find valid iif to satisfy
-		 * rp-filter when calling ip_route_input. */
-		fl.nl_u.ip4_u.daddr = iph->daddr;
-		if (ip_route_output_key(&rt, &fl) != 0)
-			return NULL;
-
-		odst = skb->dst;
-		if (ip_route_input(skb, iph->saddr, iph->daddr,
-		                   RT_TOS(iph->tos), rt->u.dst.dev) != 0) {
-			dst_release(&rt->u.dst);
-			return NULL;
-		}
-		dst_release(&rt->u.dst);
-		rt = (struct rtable *)skb->dst;
-		skb->dst = odst;
-
-		fl.nl_u.ip4_u.daddr = iph->saddr;
-		fl.nl_u.ip4_u.saddr = iph->daddr;
-		fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
-	}
-
-	if (rt->u.dst.error) {
-		dst_release(&rt->u.dst);
-		return NULL;
-	}
-
-	fl.proto = IPPROTO_TCP;
-	fl.fl_ip_sport = tcph->dest;
-	fl.fl_ip_dport = tcph->source;
-	security_skb_classify_flow(skb, &fl);
-
-	xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0);
-
-	return rt;
-}
-
 /* Send RST reply */
 static void send_reset(struct sk_buff *oldskb, int hook)
 {
 	struct sk_buff *nskb;
 	struct iphdr *iph = oldskb->nh.iph;
 	struct tcphdr _otcph, *oth, *tcph;
-	struct rtable *rt;
 	__be16 tmp_port;
 	__be32 tmp_addr;
 	int needs_ack;
-	int hh_len;
+	unsigned int addr_type;
 
 	/* IP header checks: fragment. */
 	if (oldskb->nh.iph->frag_off & htons(IP_OFFSET))
@@ -126,27 +66,17 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 	if (nf_ip_checksum(oldskb, hook, iph->ihl * 4, IPPROTO_TCP))
 		return;
 
-	if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
-		return;
-
-	hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
-
 	/* We need a linear, writeable skb.  We also need to expand
 	   headroom in case hh_len of incoming interface < hh_len of
 	   outgoing interface */
-	nskb = skb_copy_expand(oldskb, hh_len, skb_tailroom(oldskb),
+	nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb),
 			       GFP_ATOMIC);
-	if (!nskb) {
-		dst_release(&rt->u.dst);
+	if (!nskb)
 		return;
-	}
-
-	dst_release(nskb->dst);
-	nskb->dst = &rt->u.dst;
 
 	/* This packet will not be the same as the other: clear nf fields */
 	nf_reset(nskb);
-	nskb->nfmark = 0;
+	nskb->mark = 0;
 	skb_init_secmark(nskb);
 
 	tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl);
@@ -185,20 +115,33 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 	tcph->urg_ptr = 0;
 
 	/* Adjust TCP checksum */
-	nskb->ip_summed = CHECKSUM_NONE;
 	tcph->check = 0;
-	tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr),
+	tcph->check = tcp_v4_check(sizeof(struct tcphdr),
 				   nskb->nh.iph->saddr,
 				   nskb->nh.iph->daddr,
 				   csum_partial((char *)tcph,
 						sizeof(struct tcphdr), 0));
 
-	/* Adjust IP TTL, DF */
-	nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
 	/* Set DF, id = 0 */
 	nskb->nh.iph->frag_off = htons(IP_DF);
 	nskb->nh.iph->id = 0;
 
+	addr_type = RTN_UNSPEC;
+	if (hook != NF_IP_FORWARD
+#ifdef CONFIG_BRIDGE_NETFILTER
+	    || (nskb->nf_bridge && nskb->nf_bridge->mask & BRNF_BRIDGED)
+#endif
+	   )
+		addr_type = RTN_LOCAL;
+
+	if (ip_route_me_harder(&nskb, addr_type))
+		goto free_nskb;
+
+	nskb->ip_summed = CHECKSUM_NONE;
+
+	/* Adjust IP TTL */
+	nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
+
 	/* Adjust IP checksum */
 	nskb->nh.iph->check = 0;
 	nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph,