net: skb->rtable accessor

Define skb_rtable(const struct sk_buff *skb) accessor to get rtable from skb Delete skb->rtable field Setting rtable is not allowed, just set dst instead as rtable is an alias. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
git-mirror · Jun 3, 2009 · 511c3f9 · 511c3f9
1 parent dfbf97f
commit 511c3f9
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Showing 23 changed files with 89 additions and 73 deletions.
diff --git a/drivers/net/appletalk/ipddp.c b/drivers/net/appletalk/ipddp.c
@@ -115,7 +115,7 @@ static struct net_device * __init ipddp_init(void)
  */
 static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
 {
-	__be32 paddr = ((struct rtable*)skb->dst)->rt_gateway;
+	__be32 paddr = skb_rtable(skb)->rt_gateway;
         struct ddpehdr *ddp;
         struct ipddp_route *rt;
         struct atalk_addr *our_addr;

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
@@ -324,7 +324,6 @@ struct sk_buff {
 
 	union {
 		struct  dst_entry	*dst;
-		struct  rtable		*rtable;
 		unsigned long		_skb_dst;
 	};
 #ifdef CONFIG_XFRM
@@ -427,6 +426,11 @@ extern void skb_dma_unmap(struct device *dev, struct sk_buff *skb,
 			  enum dma_data_direction dir);
 #endif
 
+static inline struct rtable *skb_rtable(const struct sk_buff *skb)
+{
+	return (struct rtable *)skb->_skb_dst;
+}
+
 extern void kfree_skb(struct sk_buff *skb);
 extern void consume_skb(struct sk_buff *skb);
 extern void	       __kfree_skb(struct sk_buff *skb);

diff --git a/include/net/route.h b/include/net/route.h
@@ -210,7 +210,7 @@ static inline struct inet_peer *rt_get_peer(struct rtable *rt)
 
 static inline int inet_iif(const struct sk_buff *skb)
 {
-	return skb->rtable->rt_iif;
+	return skb_rtable(skb)->rt_iif;
 }
 
 #endif	/* _ROUTE_H */
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
@@ -228,19 +228,21 @@ int nf_bridge_copy_header(struct sk_buff *skb)
 static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
 {
 	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+	struct rtable *rt;
 
 	if (nf_bridge->mask & BRNF_PKT_TYPE) {
 		skb->pkt_type = PACKET_OTHERHOST;
 		nf_bridge->mask ^= BRNF_PKT_TYPE;
 	}
 	nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
 
-	skb->rtable = bridge_parent_rtable(nf_bridge->physindev);
-	if (!skb->rtable) {
+	rt = bridge_parent_rtable(nf_bridge->physindev);
+	if (!rt) {
 		kfree_skb(skb);
 		return 0;
 	}
-	dst_hold(&skb->rtable->u.dst);
+	dst_hold(&rt->u.dst);
+	skb->dst = &rt->u.dst;
 
 	skb->dev = nf_bridge->physindev;
 	nf_bridge_push_encap_header(skb);
@@ -338,6 +340,7 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
 	struct net_device *dev = skb->dev;
 	struct iphdr *iph = ip_hdr(skb);
 	struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+	struct rtable *rt;
 	int err;
 
 	if (nf_bridge->mask & BRNF_PKT_TYPE) {
@@ -347,7 +350,6 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
 	nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
 	if (dnat_took_place(skb)) {
 		if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) {
-			struct rtable *rt;
 			struct flowi fl = {
 				.nl_u = {
 					.ip4_u = {
@@ -404,12 +406,13 @@ static int br_nf_pre_routing_finish(struct sk_buff *skb)
 			skb->pkt_type = PACKET_HOST;
 		}
 	} else {
-		skb->rtable = bridge_parent_rtable(nf_bridge->physindev);
-		if (!skb->rtable) {
+		rt = bridge_parent_rtable(nf_bridge->physindev);
+		if (!rt) {
 			kfree_skb(skb);
 			return 0;
 		}
-		dst_hold(&skb->rtable->u.dst);
+		dst_hold(&rt->u.dst);
+		skb->dst = &rt->u.dst;
 	}
 
 	skb->dev = nf_bridge->physindev;
@@ -628,9 +631,11 @@ static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb,
 				   const struct net_device *out,
 				   int (*okfn)(struct sk_buff *))
 {
-	if (skb->rtable && skb->rtable == bridge_parent_rtable(in)) {
-		dst_release(&skb->rtable->u.dst);
-		skb->rtable = NULL;
+	struct rtable *rt = skb_rtable(skb);
+
+	if (rt && rt == bridge_parent_rtable(in)) {
+		dst_release(&rt->u.dst);
+		skb->dst = NULL;
 	}
 
 	return NF_ACCEPT;

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
@@ -452,7 +452,7 @@ static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk,
 					   struct sk_buff *skb)
 {
 	struct rtable *rt;
-	struct flowi fl = { .oif = skb->rtable->rt_iif,
+	struct flowi fl = { .oif = skb_rtable(skb)->rt_iif,
 			    .nl_u = { .ip4_u =
 				      { .daddr = ip_hdr(skb)->saddr,
 					.saddr = ip_hdr(skb)->daddr,
@@ -514,7 +514,7 @@ static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 	if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 		return;
 
-	if (rxskb->rtable->rt_type != RTN_LOCAL)
+	if (skb_rtable(rxskb)->rt_type != RTN_LOCAL)
 		return;
 
 	dst = dccp_v4_route_skb(net, ctl_sk, rxskb);
@@ -567,7 +567,7 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 	struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 
 	/* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */
-	if (skb->rtable->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
+	if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))
 		return 0;	/* discard, don't send a reset here */
 
 	if (dccp_bad_service_code(sk, service)) {

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
@@ -474,7 +474,7 @@ int arp_find(unsigned char *haddr, struct sk_buff *skb)
 		return 1;
 	}
 
-	paddr = skb->rtable->rt_gateway;
+	paddr = skb_rtable(skb)->rt_gateway;
 
 	if (arp_set_predefined(inet_addr_type(dev_net(dev), paddr), haddr, paddr, dev))
 		return 0;
@@ -817,7 +817,7 @@ static int arp_process(struct sk_buff *skb)
 	if (arp->ar_op == htons(ARPOP_REQUEST) &&
 	    ip_route_input(skb, tip, sip, 0, dev) == 0) {
 
-		rt = skb->rtable;
+		rt = skb_rtable(skb);
 		addr_type = rt->rt_type;
 
 		if (addr_type == RTN_LOCAL) {

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
@@ -356,7 +356,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
 static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
 {
 	struct ipcm_cookie ipc;
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	struct net *net = dev_net(rt->u.dst.dev);
 	struct sock *sk;
 	struct inet_sock *inet;
@@ -416,7 +416,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
 	struct iphdr *iph;
 	int room;
 	struct icmp_bxm icmp_param;
-	struct rtable *rt = skb_in->rtable;
+	struct rtable *rt = skb_rtable(skb_in);
 	struct ipcm_cookie ipc;
 	__be32 saddr;
 	u8  tos;
@@ -596,7 +596,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
 					     RT_TOS(tos), rt2->u.dst.dev);
 
 			dst_release(&rt2->u.dst);
-			rt2 = skb_in->rtable;
+			rt2 = skb_rtable(skb_in);
 			skb_in->dst = odst;
 		}
 
@@ -926,7 +926,7 @@ static void icmp_address(struct sk_buff *skb)
 
 static void icmp_address_reply(struct sk_buff *skb)
 {
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	struct net_device *dev = skb->dev;
 	struct in_device *in_dev;
 	struct in_ifaddr *ifa;
@@ -970,7 +970,7 @@ static void icmp_discard(struct sk_buff *skb)
 int icmp_rcv(struct sk_buff *skb)
 {
 	struct icmphdr *icmph;
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	struct net *net = dev_net(rt->u.dst.dev);
 
 	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
@@ -948,7 +948,7 @@ int igmp_rcv(struct sk_buff *skb)
 	case IGMPV2_HOST_MEMBERSHIP_REPORT:
 	case IGMPV3_HOST_MEMBERSHIP_REPORT:
 		/* Is it our report looped back? */
-		if (skb->rtable->fl.iif == 0)
+		if (skb_rtable(skb)->fl.iif == 0)
 			break;
 		/* don't rely on MC router hearing unicast reports */
 		if (skb->pkt_type == PACKET_MULTICAST ||

diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
@@ -81,7 +81,7 @@ int ip_forward(struct sk_buff *skb)
 	if (!xfrm4_route_forward(skb))
 		goto drop;
 
-	rt = skb->rtable;
+	rt = skb_rtable(skb);
 
 	if (opt->is_strictroute && rt->rt_dst != rt->rt_gateway)
 		goto sr_failed;

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
@@ -602,7 +602,7 @@ static int ipgre_rcv(struct sk_buff *skb)
 #ifdef CONFIG_NET_IPGRE_BROADCAST
 		if (ipv4_is_multicast(iph->daddr)) {
 			/* Looped back packet, drop it! */
-			if (skb->rtable->fl.iif == 0)
+			if (skb_rtable(skb)->fl.iif == 0)
 				goto drop;
 			stats->multicast++;
 			skb->pkt_type = PACKET_BROADCAST;
@@ -704,7 +704,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 
 		if (skb->protocol == htons(ETH_P_IP)) {
-			rt = skb->rtable;
+			rt = skb_rtable(skb);
 			if ((dst = rt->rt_gateway) == 0)
 				goto tx_error_icmp;
 		}

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
@@ -357,7 +357,7 @@ static int ip_rcv_finish(struct sk_buff *skb)
 	if (iph->ihl > 5 && ip_rcv_options(skb))
 		goto drop;
 
-	rt = skb->rtable;
+	rt = skb_rtable(skb);
 	if (rt->rt_type == RTN_MULTICAST) {
 		IP_UPD_PO_STATS_BH(dev_net(rt->u.dst.dev), IPSTATS_MIB_INMCAST,
 				skb->len);

diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
@@ -102,7 +102,7 @@ int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb)
 	sptr = skb_network_header(skb);
 	dptr = dopt->__data;
 
-	daddr = skb->rtable->rt_spec_dst;
+	daddr = skb_rtable(skb)->rt_spec_dst;
 
 	if (sopt->rr) {
 		optlen  = sptr[sopt->rr+1];
@@ -257,7 +257,7 @@ int ip_options_compile(struct net *net,
 	struct rtable *rt = NULL;
 
 	if (skb != NULL) {
-		rt = skb->rtable;
+		rt = skb_rtable(skb);
 		optptr = (unsigned char *)&(ip_hdr(skb)[1]);
 	} else
 		optptr = opt->__data;
@@ -550,7 +550,7 @@ void ip_forward_options(struct sk_buff *skb)
 {
 	struct   ip_options * opt	= &(IPCB(skb)->opt);
 	unsigned char * optptr;
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	unsigned char *raw = skb_network_header(skb);
 
 	if (opt->rr_needaddr) {
@@ -598,7 +598,7 @@ int ip_options_rcv_srr(struct sk_buff *skb)
 	__be32 nexthop;
 	struct iphdr *iph = ip_hdr(skb);
 	unsigned char *optptr = skb_network_header(skb) + opt->srr;
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	struct rtable *rt2;
 	int err;
 
@@ -623,13 +623,13 @@ int ip_options_rcv_srr(struct sk_buff *skb)
 		}
 		memcpy(&nexthop, &optptr[srrptr-1], 4);
 
-		rt = skb->rtable;
-		skb->rtable = NULL;
+		rt = skb_rtable(skb);
+		skb->dst = NULL;
 		err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev);
-		rt2 = skb->rtable;
+		rt2 = skb_rtable(skb);
 		if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) {
 			ip_rt_put(rt2);
-			skb->rtable = rt;
+			skb->dst = &rt->u.dst;
 			return -EINVAL;
 		}
 		ip_rt_put(rt);

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
@@ -140,7 +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 = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	struct iphdr *iph;
 
 	/* Build the IP header. */
@@ -238,7 +238,7 @@ static int ip_finish_output(struct sk_buff *skb)
 int ip_mc_output(struct sk_buff *skb)
 {
 	struct sock *sk = skb->sk;
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	struct net_device *dev = rt->u.dst.dev;
 
 	/*
@@ -319,7 +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 = skb->rtable;
+	rt = skb_rtable(skb);
 	if (rt != NULL)
 		goto packet_routed;
 
@@ -440,7 +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 = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 	int err = 0;
 
 	dev = rt->u.dst.dev;
@@ -1362,7 +1362,7 @@ 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 = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 
 	if (ip_options_echo(&replyopts.opt, skb))
 		return;

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
@@ -57,7 +57,7 @@
 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
 {
 	struct in_pktinfo info;
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 
 	info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
 	if (rt) {

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
@@ -416,7 +416,7 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	if (!dst) {
 		/* NBMA tunnel */
-		if ((rt = skb->rtable) == NULL) {
+		if ((rt = skb_rtable(skb)) == NULL) {
 			stats->tx_fifo_errors++;
 			goto tx_error;
 		}

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
@@ -1354,7 +1354,7 @@ static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local
 	if (net->ipv4.vif_table[vif].dev != skb->dev) {
 		int true_vifi;
 
-		if (skb->rtable->fl.iif == 0) {
+		if (skb_rtable(skb)->fl.iif == 0) {
 			/* It is our own packet, looped back.
 			   Very complicated situation...
 
@@ -1430,7 +1430,7 @@ int ip_mr_input(struct sk_buff *skb)
 {
 	struct mfc_cache *cache;
 	struct net *net = dev_net(skb->dev);
-	int local = skb->rtable->rt_flags&RTCF_LOCAL;
+	int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
 
 	/* Packet is looped back after forward, it should not be
 	   forwarded second time, but still can be delivered locally.
@@ -1646,7 +1646,7 @@ int ipmr_get_route(struct net *net,
 {
 	int err;
 	struct mfc_cache *cache;
-	struct rtable *rt = skb->rtable;
+	struct rtable *rt = skb_rtable(skb);
 
 	read_lock(&mrt_lock);
 	cache = ipmr_cache_find(net, rt->rt_src, rt->rt_dst);

diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c
@@ -72,7 +72,7 @@ masquerade_tg(struct sk_buff *skb, const struct xt_target_param *par)
 		return NF_ACCEPT;
 
 	mr = par->targinfo;
-	rt = skb->rtable;
+	rt = skb_rtable(skb);
 	newsrc = inet_select_addr(par->out, rt->rt_gateway, RT_SCOPE_UNIVERSE);
 	if (!newsrc) {
 		printk("MASQUERADE: %s ate my IP address\n", par->out->name);