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tcp: Replace constants with #define macros

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to record the state of SACK/FACK and DSACK for better readability and maintenance.

Signed-off-by: Vijay Subramanian <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Vijay Subramanian 2011-12-20 13:23:24 +00:00 • committed by David S. Miller
commit ab56222a32
4 changed files with 11 additions and 6 deletions
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2
net/ipv4/syncookies.c
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@ -245,7 +245,7 @@ bool cookie_check_timestamp(struct tcp_options_received *tcp_opt, bool *ecn_ok)
if (!sysctl_tcp_timestamps)
return false;
tcp_opt->sack_ok = (options >> 4) & 0x1;
tcp_opt->sack_ok = (options & (1 << 4)) ? TCP_SACK_SEEN : 0;
*ecn_ok = (options >> 5) & 1;
if (*ecn_ok && !sysctl_tcp_ecn)
return false;

6
net/ipv4/tcp_input.c
View file

@ -865,13 +865,13 @@ static void tcp_disable_fack(struct tcp_sock *tp)
/* RFC3517 uses different metric in lost marker => reset on change */
if (tcp_is_fack(tp))
tp->lost_skb_hint = NULL;
tp->rx_opt.sack_ok &= ~2;
tp->rx_opt.sack_ok &= ~TCP_FACK_ENABLED;
}
/* Take a notice that peer is sending D-SACKs */
static void tcp_dsack_seen(struct tcp_sock *tp)
{
tp->rx_opt.sack_ok |= 4;
tp->rx_opt.sack_ok |= TCP_DSACK_SEEN;
}
/* Initialize metrics on socket. */
@ -3878,7 +3878,7 @@ void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *o
case TCPOPT_SACK_PERM:
if (opsize == TCPOLEN_SACK_PERM && th->syn &&
!estab && sysctl_tcp_sack) {
opt_rx->sack_ok = 1;
opt_rx->sack_ok = TCP_SACK_SEEN;
tcp_sack_reset(opt_rx);
}
break;