diff options
Diffstat (limited to 'net/dccp/input.c')
| -rw-r--r-- | net/dccp/input.c | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/net/dccp/input.c b/net/dccp/input.c index 78b043c458bf..da6ec185ed5b 100644 --- a/net/dccp/input.c +++ b/net/dccp/input.c @@ -86,7 +86,8 @@ static int dccp_check_seqno(struct sock *sk, struct sk_buff *skb) dh->dccph_type == DCCP_PKT_SYNCACK) { if (between48(DCCP_SKB_CB(skb)->dccpd_ack_seq, dp->dccps_awl, dp->dccps_awh) && - !before48(DCCP_SKB_CB(skb)->dccpd_seq, dp->dccps_swl)) + dccp_delta_seqno(dp->dccps_swl, + DCCP_SKB_CB(skb)->dccpd_seq) >= 0) dccp_update_gsr(sk, DCCP_SKB_CB(skb)->dccpd_seq); else return -1; @@ -203,7 +204,8 @@ static int __dccp_rcv_established(struct sock *sk, struct sk_buff *skb, if (dp->dccps_role != DCCP_ROLE_CLIENT) goto send_sync; check_seq: - if (!before48(DCCP_SKB_CB(skb)->dccpd_seq, dp->dccps_osr)) { + if (dccp_delta_seqno(dp->dccps_osr, + DCCP_SKB_CB(skb)->dccpd_seq) >= 0) { send_sync: dccp_send_sync(sk, DCCP_SKB_CB(skb)->dccpd_seq, DCCP_PKT_SYNC); @@ -298,6 +300,14 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk, if (dccp_parse_options(sk, skb)) goto out_invalid_packet; + /* Obtain RTT sample from SYN exchange (used by CCID 3) */ + if (dp->dccps_options_received.dccpor_timestamp_echo) { + struct timeval now; + + dccp_timestamp(sk, &now); + dp->dccps_syn_rtt = dccp_sample_rtt(sk, &now, NULL); + } + if (dccp_msk(sk)->dccpms_send_ack_vector && dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk, DCCP_SKB_CB(skb)->dccpd_seq, @@ -575,3 +585,43 @@ discard: } EXPORT_SYMBOL_GPL(dccp_rcv_state_process); + +/** + * dccp_sample_rtt - Sample RTT from packet exchange + * + * @sk: connected dccp_sock + * @t_recv: receive timestamp of packet with timestamp echo + * @t_hist: packet history timestamp or NULL + */ +u32 dccp_sample_rtt(struct sock *sk, struct timeval *t_recv, + struct timeval *t_hist) +{ + struct dccp_sock *dp = dccp_sk(sk); + struct dccp_options_received *or = &dp->dccps_options_received; + suseconds_t delta; + + if (t_hist == NULL) { + if (!or->dccpor_timestamp_echo) { + DCCP_WARN("packet without timestamp echo\n"); + return DCCP_SANE_RTT_MAX; + } + timeval_sub_usecs(t_recv, or->dccpor_timestamp_echo * 10); + delta = timeval_usecs(t_recv); + } else + delta = timeval_delta(t_recv, t_hist); + + delta -= or->dccpor_elapsed_time * 10; /* either set or 0 */ + + if (unlikely(delta <= 0)) { + DCCP_WARN("unusable RTT sample %ld, using min\n", (long)delta); + return DCCP_SANE_RTT_MIN; + } + if (unlikely(delta - (suseconds_t)DCCP_SANE_RTT_MAX > 0)) { + DCCP_WARN("RTT sample %ld too large, using max\n", (long)delta); + return DCCP_SANE_RTT_MAX; + } + + return delta; +} + +EXPORT_SYMBOL_GPL(dccp_sample_rtt); |