[SK_BUFF]: Use skb_reset_network_header in skb_push cases

skb_push updates and returns skb->data, so we can just call
skb_reset_network_header after the call to skb_push.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/netpoll.c

@@ -308,7 +308,9 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 	if (udph->check == 0)
 		udph->check = CSUM_MANGLED_0;
 
-	skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
+	skb_push(skb, sizeof(*iph));
+	skb_reset_network_header(skb);
+	iph = skb->nh.iph;
 
 	/* iph->version = 4; iph->ihl = 5; */
 	put_unaligned(0x45, (unsigned char *)iph);

net/ipv4/ip_gre.c

@@ -828,7 +828,8 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	skb->h.raw = skb->nh.raw;
-	skb->nh.raw = skb_push(skb, gre_hlen);
+	skb_push(skb, gre_hlen);
+	skb_reset_network_header(skb);
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
 			      IPSKB_REROUTED);

net/ipv4/ip_output.c

@@ -503,7 +503,8 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
 			if (frag) {
 				frag->ip_summed = CHECKSUM_NONE;
 				frag->h.raw = frag->data;
-				frag->nh.raw = __skb_push(frag, hlen);
+				__skb_push(frag, hlen);
+				skb_reset_network_header(frag);
 				memcpy(frag->nh.raw, iph, hlen);
 				iph = frag->nh.iph;
 				iph->tot_len = htons(frag->len);

net/ipv4/ipip.c

@@ -619,7 +619,8 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	skb->h.raw = skb->nh.raw;
-	skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
+	skb_push(skb, sizeof(struct iphdr));
+	skb_reset_network_header(skb);
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
 			      IPSKB_REROUTED);

net/ipv4/ipmr.c

@@ -1593,7 +1593,8 @@ int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
 			return -ENOMEM;
 		}
 
-		skb2->nh.raw = skb_push(skb2, sizeof(struct iphdr));
+		skb_push(skb2, sizeof(struct iphdr));
+		skb_reset_network_header(skb2);
 		skb2->nh.iph->ihl = sizeof(struct iphdr)>>2;
 		skb2->nh.iph->saddr = rt->rt_src;
 		skb2->nh.iph->daddr = rt->rt_dst;

net/ipv4/ipvs/ip_vs_xmit.c

@@ -385,7 +385,8 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	/* fix old IP header checksum */
 	ip_send_check(old_iph);
 
-	skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
+	skb_push(skb, sizeof(struct iphdr));
+	skb_reset_network_header(skb);
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 
 	/* drop old route */

net/ipv4/xfrm4_mode_beet.c

@@ -40,7 +40,8 @@ static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
 	if (unlikely(optlen))
 		hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
 
-	skb->nh.raw = skb_push(skb, x->props.header_len + hdrlen);
+	skb_push(skb, x->props.header_len + hdrlen);
+	skb_reset_network_header(skb);
 	top_iph = skb->nh.iph;
 	skb->h.raw += sizeof(*iph) - hdrlen;
 

net/ipv4/xfrm4_mode_transport.c

@@ -32,7 +32,9 @@ static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
 	ihl = iph->ihl * 4;
 	skb->h.raw += ihl;
 
-	skb->nh.raw = memmove(skb_push(skb, x->props.header_len), iph, ihl);
+	skb_push(skb, x->props.header_len);
+	skb_reset_network_header(skb);
+	memmove(skb->nh.raw, iph, ihl);
 	return 0;
 }
 

net/ipv4/xfrm4_mode_tunnel.c

@@ -49,7 +49,8 @@ static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
 	iph = skb->nh.iph;
 	skb->h.ipiph = iph;
 
-	skb->nh.raw = skb_push(skb, x->props.header_len);
+	skb_push(skb, x->props.header_len);
+	skb_reset_network_header(skb);
 	top_iph = skb->nh.iph;
 
 	top_iph->ihl = 5;

net/ipv6/ip6_output.c

@@ -191,7 +191,9 @@ int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
 			ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
 	}
 
-	hdr = skb->nh.ipv6h = (struct ipv6hdr*)skb_push(skb, sizeof(struct ipv6hdr));
+	skb_push(skb, sizeof(struct ipv6hdr));
+	skb_reset_network_header(skb);
+	hdr = skb->nh.ipv6h;
 
 	/*
 	 *	Fill in the IPv6 header
@@ -626,7 +628,8 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
 
 		__skb_pull(skb, hlen);
 		fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr));
-		skb->nh.raw = __skb_push(skb, hlen);
+		__skb_push(skb, hlen);
+		skb_reset_network_header(skb);
 		memcpy(skb->nh.raw, tmp_hdr, hlen);
 
 		ipv6_select_ident(skb, fh);
@@ -649,7 +652,8 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
 				frag->ip_summed = CHECKSUM_NONE;
 				frag->h.raw = frag->data;
 				fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr));
-				frag->nh.raw = __skb_push(frag, hlen);
+				__skb_push(frag, hlen);
+				skb_reset_network_header(frag);
 				memcpy(frag->nh.raw, tmp_hdr, hlen);
 				offset += skb->len - hlen - sizeof(struct frag_hdr);
 				fh->nexthdr = nexthdr;
@@ -1346,7 +1350,9 @@ int ip6_push_pending_frames(struct sock *sk)
 	if (opt && opt->opt_nflen)
 		ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
 
-	skb->nh.ipv6h = hdr = (struct ipv6hdr*) skb_push(skb, sizeof(struct ipv6hdr));
+	skb_push(skb, sizeof(struct ipv6hdr));
+	skb_reset_network_header(skb);
+	hdr = skb->nh.ipv6h;
 
 	*(__be32*)hdr = fl->fl6_flowlabel |
 		     htonl(0x60000000 | ((int)np->cork.tclass << 20));

net/ipv6/ip6_tunnel.c

@@ -907,7 +907,8 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
 		init_tel_txopt(&opt, encap_limit);
 		ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
 	}
-	skb->nh.raw = skb_push(skb, sizeof(struct ipv6hdr));
+	skb_push(skb, sizeof(struct ipv6hdr));
+	skb_reset_network_header(skb);
 	ipv6h = skb->nh.ipv6h;
 	*(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000);
 	dsfield = INET_ECN_encapsulate(0, dsfield);

net/ipv6/sit.c

@@ -554,7 +554,8 @@ static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	skb->h.raw = skb->nh.raw;
-	skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
+	skb_push(skb, sizeof(struct iphdr));
+	skb_reset_network_header(skb);
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 	IPCB(skb)->flags = 0;
 	dst_release(skb->dst);