diff options
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r-- | net/ipv4/tcp_input.c | 37 |
1 files changed, 18 insertions, 19 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 580f9547ddf..f79a5160729 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -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; |