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tcp: Add tcp_parse_aligned_timestamp 

Some duplicated code lying around. Located with my suffix tree
tool.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2008-08-23 05:12:29 -07:00 committed by David S. Miller
parent 2cf46637b5
commit a4356b2920
1 changed files with 18 additions and 19 deletions
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37
net/ipv4/tcp_input.c
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@ -3442,6 +3442,22 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx,
}
}
static int tcp_parse_aligned_timestamp(struct tcp_sock *tp, struct tcphdr *th)
{
__be32 *ptr = (__be32 *)(th + 1);
if (*ptr == htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
| (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) {
tp->rx_opt.saw_tstamp = 1;
++ptr;
tp->rx_opt.rcv_tsval = ntohl(*ptr);
++ptr;
tp->rx_opt.rcv_tsecr = ntohl(*ptr);
return 1;
}
return 0;
}
/* Fast parse options. This hopes to only see timestamps.
* If it is wrong it falls back on tcp_parse_options().
*/
@ -3453,16 +3469,8 @@ static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th,
return 0;
} else if (tp->rx_opt.tstamp_ok &&
th->doff == (sizeof(struct tcphdr)>>2)+(TCPOLEN_TSTAMP_ALIGNED>>2)) {
__be32 *ptr = (__be32 *)(th + 1);
if (*ptr == htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
| (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)) {
tp->rx_opt.saw_tstamp = 1;
++ptr;
tp->rx_opt.rcv_tsval = ntohl(*ptr);
++ptr;
tp->rx_opt.rcv_tsecr = ntohl(*ptr);
if (tcp_parse_aligned_timestamp(tp, th))
return 1;
}
}
tcp_parse_options(skb, &tp->rx_opt, 1);
return 1;
@ -4822,19 +4830,10 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
/* Check timestamp */
if (tcp_header_len == sizeof(struct tcphdr) + TCPOLEN_TSTAMP_ALIGNED) {
__be32 *ptr = (__be32 *)(th + 1);
/* No? Slow path! */
if (*ptr != htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16)
| (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP))
if (!tcp_parse_aligned_timestamp(tp, th))
goto slow_path;
tp->rx_opt.saw_tstamp = 1;
++ptr;
tp->rx_opt.rcv_tsval = ntohl(*ptr);
++ptr;
tp->rx_opt.rcv_tsecr = ntohl(*ptr);
/* If PAWS failed, check it more carefully in slow path */
if ((s32)(tp->rx_opt.rcv_tsval - tp->rx_opt.ts_recent) < 0)
goto slow_path;