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Date: Thu, 29 Aug 2013 23:03:37 -0700
From: Vijay Subramanian <subramanian.vijay@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, eric.dumazet@...il.com,
Vijay Subramanian <subramanian.vijay@...il.com>
Subject: [PATCH net-next] tcp: Change return value of tcp_rcv_established()
tcp_rcv_established() returns only one value namely 0. We change the return
value to void (as suggested by David Miller).
After commit 0c24604b (tcp: implement RFC 5961 4.2), we no longer send RSTs in
response to SYNs. We can remove the check and processing on the return value of
tcp_rcv_established().
We also fix jtcp_rcv_established() in tcp_probe.c to match that of
tcp_rcv_established().
Signed-off-by: Vijay Subramanian <subramanian.vijay@...il.com>
---
Changes: Earlier patch titled "tcp: Remove needless check of return value"
fixed only the second issue above.
include/net/tcp.h | 2 +-
net/ipv4/tcp_input.c | 12 ++++++------
net/ipv4/tcp_ipv4.c | 5 +----
net/ipv4/tcp_probe.c | 4 ++--
net/ipv6/tcp_ipv6.c | 3 +--
5 files changed, 11 insertions(+), 15 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6a6a88d..9fb1917 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -371,7 +371,7 @@ extern void tcp_delack_timer_handler(struct sock *sk);
extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th, unsigned int len);
-extern int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
+extern void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th, unsigned int len);
extern void tcp_rcv_space_adjust(struct sock *sk);
extern void tcp_cleanup_rbuf(struct sock *sk, int copied);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1a84fff..2711acb 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5049,7 +5049,7 @@ discard:
* the rest is checked inline. Fast processing is turned on in
* tcp_data_queue when everything is OK.
*/
-int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
+void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th, unsigned int len)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -5127,7 +5127,7 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
tcp_ack(sk, skb, 0);
__kfree_skb(skb);
tcp_data_snd_check(sk);
- return 0;
+ return;
} else { /* Header too small */
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
goto discard;
@@ -5220,7 +5220,7 @@ no_ack:
if (eaten)
kfree_skb_partial(skb, fragstolen);
sk->sk_data_ready(sk, 0);
- return 0;
+ return;
}
}
@@ -5236,7 +5236,7 @@ slow_path:
*/
if (!tcp_validate_incoming(sk, skb, th, 1))
- return 0;
+ return;
step5:
if (tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT) < 0)
@@ -5252,7 +5252,7 @@ step5:
tcp_data_snd_check(sk);
tcp_ack_snd_check(sk);
- return 0;
+ return;
csum_error:
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
@@ -5260,7 +5260,7 @@ csum_error:
discard:
__kfree_skb(skb);
- return 0;
+ return;
}
EXPORT_SYMBOL(tcp_rcv_established);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 09d45d7..b14266b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1799,10 +1799,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
sk->sk_rx_dst = NULL;
}
}
- if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) {
- rsk = sk;
- goto reset;
- }
+ tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
return 0;
}
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c
index 622a437..8b10379 100644
--- a/net/ipv4/tcp_probe.c
+++ b/net/ipv4/tcp_probe.c
@@ -122,7 +122,7 @@ static inline int tcp_probe_avail(void)
* Hook inserted to be called before each receive packet.
* Note: arguments must match tcp_rcv_established()!
*/
-static int jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
+static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th, unsigned int len)
{
const struct tcp_sock *tp = tcp_sk(sk);
@@ -172,7 +172,7 @@ static int jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
}
jprobe_return();
- return 0;
+ return;
}
static struct jprobe tcp_jprobe = {
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 5bcfadf..9acdced 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1360,8 +1360,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
}
}
- if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
- goto reset;
+ tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
if (opt_skb)
goto ipv6_pktoptions;
return 0;
--
1.7.9.5
--
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