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Date: Wed, 27 Jun 2012 22:07:53 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH] ipv4: Kill early demux method return value.
It's completely unnecessary.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
include/net/protocol.h | 2 +-
include/net/tcp.h | 2 +-
net/ipv4/ip_input.c | 42 +++++++++++++++++++-----------------------
net/ipv4/tcp_ipv4.c | 19 ++++++-------------
4 files changed, 27 insertions(+), 38 deletions(-)
diff --git a/include/net/protocol.h b/include/net/protocol.h
index 967b926..057f2d3 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -37,7 +37,7 @@
/* This is used to register protocols. */
struct net_protocol {
- int (*early_demux)(struct sk_buff *skb);
+ void (*early_demux)(struct sk_buff *skb);
int (*handler)(struct sk_buff *skb);
void (*err_handler)(struct sk_buff *skb, u32 info);
int (*gso_send_check)(struct sk_buff *skb);
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6660ffc..53fb7d8 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -325,7 +325,7 @@ extern void tcp_v4_err(struct sk_buff *skb, u32);
extern void tcp_shutdown (struct sock *sk, int how);
-extern int tcp_v4_early_demux(struct sk_buff *skb);
+extern void tcp_v4_early_demux(struct sk_buff *skb);
extern int tcp_v4_rcv(struct sk_buff *skb);
extern struct inet_peer *tcp_v4_get_peer(struct sock *sk);
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 2a39204..b27d444 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -320,33 +320,29 @@ static int ip_rcv_finish(struct sk_buff *skb)
const struct iphdr *iph = ip_hdr(skb);
struct rtable *rt;
+ if (sysctl_ip_early_demux && !skb_dst(skb)) {
+ const struct net_protocol *ipprot;
+ int protocol = iph->protocol;
+
+ rcu_read_lock();
+ ipprot = rcu_dereference(inet_protos[protocol]);
+ if (ipprot && ipprot->early_demux)
+ ipprot->early_demux(skb);
+ rcu_read_unlock();
+ }
+
/*
* Initialise the virtual path cache for the packet. It describes
* how the packet travels inside Linux networking.
*/
- if (skb_dst(skb) == NULL) {
- int err = -ENOENT;
-
- if (sysctl_ip_early_demux) {
- const struct net_protocol *ipprot;
- int protocol = iph->protocol;
-
- rcu_read_lock();
- ipprot = rcu_dereference(inet_protos[protocol]);
- if (ipprot && ipprot->early_demux)
- err = ipprot->early_demux(skb);
- rcu_read_unlock();
- }
-
- if (err) {
- err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
- iph->tos, skb->dev);
- if (unlikely(err)) {
- if (err == -EXDEV)
- NET_INC_STATS_BH(dev_net(skb->dev),
- LINUX_MIB_IPRPFILTER);
- goto drop;
- }
+ if (!skb_dst(skb)) {
+ int err = ip_route_input_noref(skb, iph->daddr, iph->saddr,
+ iph->tos, skb->dev);
+ if (unlikely(err)) {
+ if (err == -EXDEV)
+ NET_INC_STATS_BH(dev_net(skb->dev),
+ LINUX_MIB_IPRPFILTER);
+ goto drop;
}
}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1781dc6..b4ae1c1 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1673,30 +1673,28 @@ csum_err:
}
EXPORT_SYMBOL(tcp_v4_do_rcv);
-int tcp_v4_early_demux(struct sk_buff *skb)
+void tcp_v4_early_demux(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
const struct iphdr *iph;
const struct tcphdr *th;
struct net_device *dev;
struct sock *sk;
- int err;
- err = -ENOENT;
if (skb->pkt_type != PACKET_HOST)
- goto out_err;
+ return;
if (!pskb_may_pull(skb, ip_hdrlen(skb) + sizeof(struct tcphdr)))
- goto out_err;
+ return;
iph = ip_hdr(skb);
th = (struct tcphdr *) ((char *)iph + ip_hdrlen(skb));
if (th->doff < sizeof(struct tcphdr) / 4)
- goto out_err;
+ return;
if (!pskb_may_pull(skb, ip_hdrlen(skb) + th->doff * 4))
- goto out_err;
+ return;
dev = skb->dev;
sk = __inet_lookup_established(net, &tcp_hashinfo,
@@ -1713,16 +1711,11 @@ int tcp_v4_early_demux(struct sk_buff *skb)
if (dst) {
struct rtable *rt = (struct rtable *) dst;
- if (rt->rt_iif == dev->ifindex) {
+ if (rt->rt_iif == dev->ifindex)
skb_dst_set_noref(skb, dst);
- err = 0;
- }
}
}
}
-
-out_err:
- return err;
}
/*
--
1.7.10
--
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