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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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vijay Subramanian 2013-09-03 12:23:22 -07:00 committed by David S. Miller
parent cc8c6c1b21
commit c995ae2259
5 changed files with 12 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/tcp.h
View File

@ -371,8 +371,8 @@ extern void tcp_delack_timer_handler(struct sock *sk);
extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg); 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, extern int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th, unsigned int len); 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); const struct tcphdr *th, unsigned int len);
extern void tcp_rcv_space_adjust(struct sock *sk); extern void tcp_rcv_space_adjust(struct sock *sk);
extern void tcp_cleanup_rbuf(struct sock *sk, int copied); extern void tcp_cleanup_rbuf(struct sock *sk, int copied);
extern int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp); extern int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);

13
net/ipv4/tcp_input.c
View File

@ -5049,8 +5049,8 @@ discard:
* the rest is checked inline. Fast processing is turned on in * the rest is checked inline. Fast processing is turned on in
* tcp_data_queue when everything is OK. * 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) const struct tcphdr *th, unsigned int len)
{ {
struct tcp_sock *tp = tcp_sk(sk); 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); tcp_ack(sk, skb, 0);
__kfree_skb(skb); __kfree_skb(skb);
tcp_data_snd_check(sk); tcp_data_snd_check(sk);
return 0; return;
} else { /* Header too small */ } else { /* Header too small */
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
goto discard; goto discard;
@ -5220,7 +5220,7 @@ no_ack:
if (eaten) if (eaten)
kfree_skb_partial(skb, fragstolen); kfree_skb_partial(skb, fragstolen);
sk->sk_data_ready(sk, 0); sk->sk_data_ready(sk, 0);
return 0; return;
} }
} }
@ -5236,7 +5236,7 @@ slow_path:
*/ */
if (!tcp_validate_incoming(sk, skb, th, 1)) if (!tcp_validate_incoming(sk, skb, th, 1))
return 0; return;
step5: step5:
if (tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT) < 0) if (tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT) < 0)
@ -5252,7 +5252,7 @@ step5:
tcp_data_snd_check(sk); tcp_data_snd_check(sk);
tcp_ack_snd_check(sk); tcp_ack_snd_check(sk);
return 0; return;
csum_error: csum_error:
TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
@ -5260,7 +5260,6 @@ csum_error:
discard: discard:
__kfree_skb(skb); __kfree_skb(skb);
return 0;
} }
EXPORT_SYMBOL(tcp_rcv_established); EXPORT_SYMBOL(tcp_rcv_established);

5
net/ipv4/tcp_ipv4.c
View File

@ -1799,10 +1799,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
sk->sk_rx_dst = NULL; sk->sk_rx_dst = NULL;
} }
} }
if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) { tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
rsk = sk;
goto reset;
}
return 0; return 0;
} }

5
net/ipv4/tcp_probe.c
View File

@ -122,8 +122,8 @@ static inline int tcp_probe_avail(void)
* Hook inserted to be called before each receive packet. * Hook inserted to be called before each receive packet.
* Note: arguments must match tcp_rcv_established()! * 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 tcphdr *th, unsigned int len)
{ {
const struct tcp_sock *tp = tcp_sk(sk); const struct tcp_sock *tp = tcp_sk(sk);
const struct inet_sock *inet = inet_sk(sk); const struct inet_sock *inet = inet_sk(sk);
@ -172,7 +172,6 @@ static int jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
} }
jprobe_return(); jprobe_return();
return 0;
} }
static struct jprobe tcp_jprobe = { static struct jprobe tcp_jprobe = {

3
net/ipv6/tcp_ipv6.c
View File

@ -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)) tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
goto reset;
if (opt_skb) if (opt_skb)
goto ipv6_pktoptions; goto ipv6_pktoptions;
return 0; return 0;