X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fipv4%2Fip_output.c;h=8ebe86dd72af159e2250bc315251cf61561cc38a;hb=76a67ec6fb79ff3570dcb5342142c16098299911;hp=699f06781fd891df9882d1c77c0c335f8d7a7252;hpb=3b04ddde02cf1b6f14f2697da5c20eca5715017f;p=safe%2Fjmp%2Flinux-2.6

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 699f067..8ebe86d 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -5,8 +5,6 @@
  *
  *		The Internet Protocol (IP) output module.
  *
- * Version:	$Id: ip_output.c,v 1.100 2002/02/01 22:01:03 davem Exp $
- *
  * Authors:	Ross Biro
  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  *		Donald Becker, <becker@super.org>
@@ -91,6 +89,28 @@ __inline__ void ip_send_check(struct iphdr *iph)
 	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 }
 
+int __ip_local_out(struct sk_buff *skb)
+{
+	struct iphdr *iph = ip_hdr(skb);
+
+	iph->tot_len = htons(skb->len);
+	ip_send_check(iph);
+	return nf_hook(PF_INET, NF_INET_LOCAL_OUT, skb, NULL, skb->dst->dev,
+		       dst_output);
+}
+
+int ip_local_out(struct sk_buff *skb)
+{
+	int err;
+
+	err = __ip_local_out(skb);
+	if (likely(err == 1))
+		err = dst_output(skb);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(ip_local_out);
+
 /* dev_loopback_xmit for use with netfilter. */
 static int ip_dev_loopback_xmit(struct sk_buff *newskb)
 {
@@ -98,7 +118,7 @@ static int ip_dev_loopback_xmit(struct sk_buff *newskb)
 	__skb_pull(newskb, skb_network_offset(newskb));
 	newskb->pkt_type = PACKET_LOOPBACK;
 	newskb->ip_summed = CHECKSUM_UNNECESSARY;
-	BUG_TRAP(newskb->dst);
+	WARN_ON(!newskb->dst);
 	netif_rx(newskb);
 	return 0;
 }
@@ -120,7 +140,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
 			  __be32 saddr, __be32 daddr, struct ip_options *opt)
 {
 	struct inet_sock *inet = inet_sk(sk);
-	struct rtable *rt = (struct rtable *)skb->dst;
+	struct rtable *rt = skb->rtable;
 	struct iphdr *iph;
 
 	/* Build the IP header. */
@@ -138,20 +158,18 @@ int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
 	iph->daddr    = rt->rt_dst;
 	iph->saddr    = rt->rt_src;
 	iph->protocol = sk->sk_protocol;
-	iph->tot_len  = htons(skb->len);
 	ip_select_ident(iph, &rt->u.dst, sk);
 
 	if (opt && opt->optlen) {
 		iph->ihl += opt->optlen>>2;
 		ip_options_build(skb, opt, daddr, rt, 0);
 	}
-	ip_send_check(iph);
 
 	skb->priority = sk->sk_priority;
+	skb->mark = sk->sk_mark;
 
 	/* Send it out. */
-	return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
-		       dst_output);
+	return ip_local_out(skb);
 }
 
 EXPORT_SYMBOL_GPL(ip_build_and_send_pkt);
@@ -161,12 +179,12 @@ static inline int ip_finish_output2(struct sk_buff *skb)
 	struct dst_entry *dst = skb->dst;
 	struct rtable *rt = (struct rtable *)dst;
 	struct net_device *dev = dst->dev;
-	int hh_len = LL_RESERVED_SPACE(dev);
+	unsigned int hh_len = LL_RESERVED_SPACE(dev);
 
 	if (rt->rt_type == RTN_MULTICAST)
-		IP_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
+		IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTMCASTPKTS);
 	else if (rt->rt_type == RTN_BROADCAST)
-		IP_INC_STATS(IPSTATS_MIB_OUTBCASTPKTS);
+		IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTBCASTPKTS);
 
 	/* Be paranoid, rather than too clever. */
 	if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
@@ -202,7 +220,7 @@ static inline int ip_skb_dst_mtu(struct sk_buff *skb)
 	       skb->dst->dev->mtu : dst_mtu(skb->dst);
 }
 
-static inline int ip_finish_output(struct sk_buff *skb)
+static int ip_finish_output(struct sk_buff *skb)
 {
 #if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM)
 	/* Policy lookup after SNAT yielded a new policy */
@@ -220,13 +238,13 @@ static inline int ip_finish_output(struct sk_buff *skb)
 int ip_mc_output(struct sk_buff *skb)
 {
 	struct sock *sk = skb->sk;
-	struct rtable *rt = (struct rtable*)skb->dst;
+	struct rtable *rt = skb->rtable;
 	struct net_device *dev = rt->u.dst.dev;
 
 	/*
 	 *	If the indicated interface is up and running, send the packet.
 	 */
-	IP_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
+	IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTREQUESTS);
 
 	skb->dev = dev;
 	skb->protocol = htons(ETH_P_IP);
@@ -251,8 +269,8 @@ int ip_mc_output(struct sk_buff *skb)
 		) {
 			struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
 			if (newskb)
-				NF_HOOK(PF_INET, NF_IP_POST_ROUTING, newskb, NULL,
-					newskb->dev,
+				NF_HOOK(PF_INET, NF_INET_POST_ROUTING, newskb,
+					NULL, newskb->dev,
 					ip_dev_loopback_xmit);
 		}
 
@@ -267,11 +285,11 @@ int ip_mc_output(struct sk_buff *skb)
 	if (rt->rt_flags&RTCF_BROADCAST) {
 		struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
 		if (newskb)
-			NF_HOOK(PF_INET, NF_IP_POST_ROUTING, newskb, NULL,
+			NF_HOOK(PF_INET, NF_INET_POST_ROUTING, newskb, NULL,
 				newskb->dev, ip_dev_loopback_xmit);
 	}
 
-	return NF_HOOK_COND(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dev,
+	return NF_HOOK_COND(PF_INET, NF_INET_POST_ROUTING, skb, NULL, skb->dev,
 			    ip_finish_output,
 			    !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
@@ -280,12 +298,12 @@ int ip_output(struct sk_buff *skb)
 {
 	struct net_device *dev = skb->dst->dev;
 
-	IP_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
+	IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTREQUESTS);
 
 	skb->dev = dev;
 	skb->protocol = htons(ETH_P_IP);
 
-	return NF_HOOK_COND(PF_INET, NF_IP_POST_ROUTING, skb, NULL, dev,
+	return NF_HOOK_COND(PF_INET, NF_INET_POST_ROUTING, skb, NULL, dev,
 			    ip_finish_output,
 			    !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
@@ -301,7 +319,7 @@ int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
 	/* Skip all of this if the packet is already routed,
 	 * f.e. by something like SCTP.
 	 */
-	rt = (struct rtable *) skb->dst;
+	rt = skb->rtable;
 	if (rt != NULL)
 		goto packet_routed;
 
@@ -322,6 +340,7 @@ int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
 							.saddr = inet->saddr,
 							.tos = RT_CONN_FLAGS(sk) } },
 					    .proto = sk->sk_protocol,
+					    .flags = inet_sk_flowi_flags(sk),
 					    .uli_u = { .ports =
 						       { .sport = inet->sport,
 							 .dport = inet->dport } } };
@@ -331,7 +350,7 @@ int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
 			 * itself out.
 			 */
 			security_sk_classify_flow(sk, &fl);
-			if (ip_route_output_flow(&rt, &fl, sk, 0))
+			if (ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0))
 				goto no_route;
 		}
 		sk_setup_caps(sk, &rt->u.dst);
@@ -347,7 +366,6 @@ packet_routed:
 	skb_reset_network_header(skb);
 	iph = ip_hdr(skb);
 	*((__be16 *)iph) = htons((4 << 12) | (5 << 8) | (inet->tos & 0xff));
-	iph->tot_len = htons(skb->len);
 	if (ip_dont_fragment(sk, &rt->u.dst) && !ipfragok)
 		iph->frag_off = htons(IP_DF);
 	else
@@ -366,16 +384,13 @@ packet_routed:
 	ip_select_ident_more(iph, &rt->u.dst, sk,
 			     (skb_shinfo(skb)->gso_segs ?: 1) - 1);
 
-	/* Add an IP checksum. */
-	ip_send_check(iph);
-
 	skb->priority = sk->sk_priority;
+	skb->mark = sk->sk_mark;
 
-	return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
-		       dst_output);
+	return ip_local_out(skb);
 
 no_route:
-	IP_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
+	IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
 	kfree_skb(skb);
 	return -EHOSTUNREACH;
 }
@@ -415,7 +430,7 @@ static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from)
  *	single device frame, and queue such a frame for sending.
  */
 
-int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
+int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
 {
 	struct iphdr *iph;
 	int raw = 0;
@@ -425,7 +440,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 	unsigned int mtu, hlen, left, len, ll_rs, pad;
 	int offset;
 	__be16 not_last_frag;
-	struct rtable *rt = (struct rtable*)skb->dst;
+	struct rtable *rt = skb->rtable;
 	int err = 0;
 
 	dev = rt->u.dst.dev;
@@ -437,7 +452,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 	iph = ip_hdr(skb);
 
 	if (unlikely((iph->frag_off & htons(IP_DF)) && !skb->local_df)) {
-		IP_INC_STATS(IPSTATS_MIB_FRAGFAILS);
+		IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
 		icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 			  htonl(ip_skb_dst_mtu(skb)));
 		kfree_skb(skb);
@@ -462,6 +477,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 	if (skb_shinfo(skb)->frag_list) {
 		struct sk_buff *frag;
 		int first_len = skb_pagelen(skb);
+		int truesizes = 0;
 
 		if (first_len - hlen > mtu ||
 		    ((first_len - hlen) & 7) ||
@@ -485,7 +501,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 				sock_hold(skb->sk);
 				frag->sk = skb->sk;
 				frag->destructor = sock_wfree;
-				skb->truesize -= frag->truesize;
+				truesizes += frag->truesize;
 			}
 		}
 
@@ -496,6 +512,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 		frag = skb_shinfo(skb)->frag_list;
 		skb_shinfo(skb)->frag_list = NULL;
 		skb->data_len = first_len - skb_headlen(skb);
+		skb->truesize -= truesizes;
 		skb->len = first_len;
 		iph->tot_len = htons(first_len);
 		iph->frag_off = htons(IP_MF);
@@ -526,7 +543,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 			err = output(skb);
 
 			if (!err)
-				IP_INC_STATS(IPSTATS_MIB_FRAGCREATES);
+				IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGCREATES);
 			if (err || !frag)
 				break;
 
@@ -536,7 +553,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 		}
 
 		if (err == 0) {
-			IP_INC_STATS(IPSTATS_MIB_FRAGOKS);
+			IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGOKS);
 			return 0;
 		}
 
@@ -545,7 +562,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 			kfree_skb(frag);
 			frag = skb;
 		}
-		IP_INC_STATS(IPSTATS_MIB_FRAGFAILS);
+		IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
 		return err;
 	}
 
@@ -657,15 +674,15 @@ slow_path:
 		if (err)
 			goto fail;
 
-		IP_INC_STATS(IPSTATS_MIB_FRAGCREATES);
+		IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGCREATES);
 	}
 	kfree_skb(skb);
-	IP_INC_STATS(IPSTATS_MIB_FRAGOKS);
+	IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGOKS);
 	return err;
 
 fail:
 	kfree_skb(skb);
-	IP_INC_STATS(IPSTATS_MIB_FRAGFAILS);
+	IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
 	return err;
 }
 
@@ -703,7 +720,7 @@ static inline int ip_ufo_append_data(struct sock *sk,
 			int getfrag(void *from, char *to, int offset, int len,
 			       int odd, struct sk_buff *skb),
 			void *from, int length, int hh_len, int fragheaderlen,
-			int transhdrlen, int mtu,unsigned int flags)
+			int transhdrlen, int mtu, unsigned int flags)
 {
 	struct sk_buff *skb;
 	int err;
@@ -724,7 +741,7 @@ static inline int ip_ufo_append_data(struct sock *sk,
 		skb_reserve(skb, hh_len);
 
 		/* create space for UDP/IP header */
-		skb_put(skb,fragheaderlen + transhdrlen);
+		skb_put(skb, fragheaderlen + transhdrlen);
 
 		/* initialize network header pointer */
 		skb_reset_network_header(skb);
@@ -735,23 +752,15 @@ static inline int ip_ufo_append_data(struct sock *sk,
 		skb->ip_summed = CHECKSUM_PARTIAL;
 		skb->csum = 0;
 		sk->sk_sndmsg_off = 0;
-	}
 
-	err = skb_append_datato_frags(sk,skb, getfrag, from,
-			       (length - transhdrlen));
-	if (!err) {
-		/* specify the length of each IP datagram fragment*/
+		/* specify the length of each IP datagram fragment */
 		skb_shinfo(skb)->gso_size = mtu - fragheaderlen;
 		skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
 		__skb_queue_tail(&sk->sk_write_queue, skb);
-
-		return 0;
 	}
-	/* There is not enough support do UFO ,
-	 * so follow normal path
-	 */
-	kfree_skb(skb);
-	return err;
+
+	return skb_append_datato_frags(sk, skb, getfrag, from,
+				       (length - transhdrlen));
 }
 
 /*
@@ -769,7 +778,7 @@ int ip_append_data(struct sock *sk,
 		   int getfrag(void *from, char *to, int offset, int len,
 			       int odd, struct sk_buff *skb),
 		   void *from, int length, int transhdrlen,
-		   struct ipcm_cookie *ipc, struct rtable *rt,
+		   struct ipcm_cookie *ipc, struct rtable **rtp,
 		   unsigned int flags)
 {
 	struct inet_sock *inet = inet_sk(sk);
@@ -784,6 +793,7 @@ int ip_append_data(struct sock *sk,
 	int offset = 0;
 	unsigned int maxfraglen, fragheaderlen;
 	int csummode = CHECKSUM_NONE;
+	struct rtable *rt;
 
 	if (flags&MSG_PROBE)
 		return 0;
@@ -803,11 +813,15 @@ int ip_append_data(struct sock *sk,
 			inet->cork.flags |= IPCORK_OPT;
 			inet->cork.addr = ipc->addr;
 		}
-		dst_hold(&rt->u.dst);
+		rt = *rtp;
+		/*
+		 * We steal reference to this route, caller should not release it
+		 */
+		*rtp = NULL;
 		inet->cork.fragsize = mtu = inet->pmtudisc == IP_PMTUDISC_PROBE ?
 					    rt->u.dst.dev->mtu :
 					    dst_mtu(rt->u.dst.path);
-		inet->cork.rt = rt;
+		inet->cork.dst = &rt->u.dst;
 		inet->cork.length = 0;
 		sk->sk_sndmsg_page = NULL;
 		sk->sk_sndmsg_off = 0;
@@ -816,7 +830,7 @@ int ip_append_data(struct sock *sk,
 			transhdrlen += exthdrlen;
 		}
 	} else {
-		rt = inet->cork.rt;
+		rt = (struct rtable *)inet->cork.dst;
 		if (inet->cork.flags & IPCORK_OPT)
 			opt = inet->cork.opt;
 
@@ -845,9 +859,9 @@ int ip_append_data(struct sock *sk,
 		csummode = CHECKSUM_PARTIAL;
 
 	inet->cork.length += length;
-	if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) &&
-			(rt->u.dst.dev->features & NETIF_F_UFO)) {
-
+	if (((length> mtu) || !skb_queue_empty(&sk->sk_write_queue)) &&
+	    (sk->sk_protocol == IPPROTO_UDP) &&
+	    (rt->u.dst.dev->features & NETIF_F_UFO)) {
 		err = ip_ufo_append_data(sk, getfrag, from, length, hh_len,
 					 fragheaderlen, transhdrlen, mtu,
 					 flags);
@@ -1016,8 +1030,6 @@ alloc_new_skb:
 
 				skb_fill_page_desc(skb, i, page, 0, 0);
 				frag = &skb_shinfo(skb)->frags[i];
-				skb->truesize += PAGE_SIZE;
-				atomic_add(PAGE_SIZE, &sk->sk_wmem_alloc);
 			} else {
 				err = -EMSGSIZE;
 				goto error;
@@ -1030,6 +1042,8 @@ alloc_new_skb:
 			frag->size += copy;
 			skb->len += copy;
 			skb->data_len += copy;
+			skb->truesize += copy;
+			atomic_add(copy, &sk->sk_wmem_alloc);
 		}
 		offset += copy;
 		length -= copy;
@@ -1039,7 +1053,7 @@ alloc_new_skb:
 
 error:
 	inet->cork.length -= length;
-	IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
+	IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTDISCARDS);
 	return err;
 }
 
@@ -1065,7 +1079,7 @@ ssize_t	ip_append_page(struct sock *sk, struct page *page,
 	if (skb_queue_empty(&sk->sk_write_queue))
 		return -EINVAL;
 
-	rt = inet->cork.rt;
+	rt = (struct rtable *)inet->cork.dst;
 	if (inet->cork.flags & IPCORK_OPT)
 		opt = inet->cork.opt;
 
@@ -1172,6 +1186,8 @@ ssize_t	ip_append_page(struct sock *sk, struct page *page,
 
 		skb->len += len;
 		skb->data_len += len;
+		skb->truesize += len;
+		atomic_add(len, &sk->sk_wmem_alloc);
 		offset += len;
 		size -= len;
 	}
@@ -1179,10 +1195,19 @@ ssize_t	ip_append_page(struct sock *sk, struct page *page,
 
 error:
 	inet->cork.length -= size;
-	IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
+	IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTDISCARDS);
 	return err;
 }
 
+static void ip_cork_release(struct inet_sock *inet)
+{
+	inet->cork.flags &= ~IPCORK_OPT;
+	kfree(inet->cork.opt);
+	inet->cork.opt = NULL;
+	dst_release(inet->cork.dst);
+	inet->cork.dst = NULL;
+}
+
 /*
  *	Combined all pending IP fragments on the socket as one IP datagram
  *	and push them out.
@@ -1192,8 +1217,9 @@ int ip_push_pending_frames(struct sock *sk)
 	struct sk_buff *skb, *tmp_skb;
 	struct sk_buff **tail_skb;
 	struct inet_sock *inet = inet_sk(sk);
+	struct net *net = sock_net(sk);
 	struct ip_options *opt = NULL;
-	struct rtable *rt = inet->cork.rt;
+	struct rtable *rt = (struct rtable *)inet->cork.dst;
 	struct iphdr *iph;
 	__be16 df = 0;
 	__u8 ttl;
@@ -1249,25 +1275,28 @@ int ip_push_pending_frames(struct sock *sk)
 		ip_options_build(skb, opt, inet->cork.addr, rt, 0);
 	}
 	iph->tos = inet->tos;
-	iph->tot_len = htons(skb->len);
 	iph->frag_off = df;
 	ip_select_ident(iph, &rt->u.dst, sk);
 	iph->ttl = ttl;
 	iph->protocol = sk->sk_protocol;
 	iph->saddr = rt->rt_src;
 	iph->daddr = rt->rt_dst;
-	ip_send_check(iph);
 
 	skb->priority = sk->sk_priority;
-	skb->dst = dst_clone(&rt->u.dst);
+	skb->mark = sk->sk_mark;
+	/*
+	 * Steal rt from cork.dst to avoid a pair of atomic_inc/atomic_dec
+	 * on dst refcount
+	 */
+	inet->cork.dst = NULL;
+	skb->dst = &rt->u.dst;
 
 	if (iph->protocol == IPPROTO_ICMP)
-		icmp_out_count(((struct icmphdr *)
+		icmp_out_count(net, ((struct icmphdr *)
 			skb_transport_header(skb))->type);
 
 	/* Netfilter gets whole the not fragmented skb. */
-	err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL,
-		      skb->dst->dev, dst_output);
+	err = ip_local_out(skb);
 	if (err) {
 		if (err > 0)
 			err = inet->recverr ? net_xmit_errno(err) : 0;
@@ -1276,17 +1305,11 @@ int ip_push_pending_frames(struct sock *sk)
 	}
 
 out:
-	inet->cork.flags &= ~IPCORK_OPT;
-	kfree(inet->cork.opt);
-	inet->cork.opt = NULL;
-	if (inet->cork.rt) {
-		ip_rt_put(inet->cork.rt);
-		inet->cork.rt = NULL;
-	}
+	ip_cork_release(inet);
 	return err;
 
 error:
-	IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
+	IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
 	goto out;
 }
 
@@ -1295,19 +1318,12 @@ error:
  */
 void ip_flush_pending_frames(struct sock *sk)
 {
-	struct inet_sock *inet = inet_sk(sk);
 	struct sk_buff *skb;
 
 	while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
 		kfree_skb(skb);
 
-	inet->cork.flags &= ~IPCORK_OPT;
-	kfree(inet->cork.opt);
-	inet->cork.opt = NULL;
-	if (inet->cork.rt) {
-		ip_rt_put(inet->cork.rt);
-		inet->cork.rt = NULL;
-	}
+	ip_cork_release(inet_sk(sk));
 }
 
 
@@ -1330,8 +1346,6 @@ static int ip_reply_glue_bits(void *dptr, char *to, int offset,
  *
  *	Should run single threaded per socket because it uses the sock
  *     	structure to pass arguments.
- *
- *	LATER: switch from ip_build_xmit to ip_append_*
  */
 void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
 		   unsigned int len)
@@ -1343,7 +1357,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
 	} replyopts;
 	struct ipcm_cookie ipc;
 	__be32 daddr;
-	struct rtable *rt = (struct rtable*)skb->dst;
+	struct rtable *rt = skb->rtable;
 
 	if (ip_options_echo(&replyopts.opt, skb))
 		return;
@@ -1368,9 +1382,10 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
 				    .uli_u = { .ports =
 					       { .sport = tcp_hdr(skb)->dest,
 						 .dport = tcp_hdr(skb)->source } },
-				    .proto = sk->sk_protocol };
+				    .proto = sk->sk_protocol,
+				    .flags = ip_reply_arg_flowi_flags(arg) };
 		security_skb_classify_flow(skb, &fl);
-		if (ip_route_output_key(&rt, &fl))
+		if (ip_route_output_key(sock_net(sk), &rt, &fl))
 			return;
 	}
 
@@ -1386,7 +1401,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
 	sk->sk_protocol = ip_hdr(skb)->protocol;
 	sk->sk_bound_dev_if = arg->bound_dev_if;
 	ip_append_data(sk, ip_reply_glue_bits, arg->iov->iov_base, len, 0,
-		       &ipc, rt, MSG_DONTWAIT);
+		       &ipc, &rt, MSG_DONTWAIT);
 	if ((skb = skb_peek(&sk->sk_write_queue)) != NULL) {
 		if (arg->csumoffset >= 0)
 			*((__sum16 *)skb_transport_header(skb) +