diff options
| -rw-r--r-- | include/linux/snmp.h | 3 | ||||
| -rw-r--r-- | net/ipv4/proc.c | 3 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 10 |
3 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/snmp.h b/include/linux/snmp.h index 802b3a3..d24c554 100644 --- a/include/linux/snmp.h +++ b/include/linux/snmp.h @@ -231,6 +231,9 @@ enum LINUX_MIB_TCPABORTONLINGER, /* TCPAbortOnLinger */ LINUX_MIB_TCPABORTFAILED, /* TCPAbortFailed */ LINUX_MIB_TCPMEMORYPRESSURES, /* TCPMemoryPressures */ + LINUX_MIB_TCPSACKDISCARD, /* TCPSACKDiscard */ + LINUX_MIB_TCPDSACKIGNOREDOLD, /* TCPSACKIgnoredOld */ + LINUX_MIB_TCPDSACKIGNOREDNOUNDO, /* TCPSACKIgnoredNoUndo */ __LINUX_MIB_MAX }; diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 3b690cf..986d1c8 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -244,6 +244,9 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER), SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED), SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES), + SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD), + SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD), + SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO), SNMP_MIB_SENTINEL }; diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index a2364eb..f9e4d7a 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1240,8 +1240,16 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ int fack_count; int dup_sack = (found_dup_sack && (i == first_sack_index)); - if (!tcp_is_sackblock_valid(tp, dup_sack, start_seq, end_seq)) + if (!tcp_is_sackblock_valid(tp, dup_sack, start_seq, end_seq)) { + if (dup_sack) { + if (!tp->undo_marker) + NET_INC_STATS_BH(LINUX_MIB_TCPDSACKIGNOREDNOUNDO); + else + NET_INC_STATS_BH(LINUX_MIB_TCPDSACKIGNOREDOLD); + } else + NET_INC_STATS_BH(LINUX_MIB_TCPSACKDISCARD); continue; + } skb = cached_skb; fack_count = cached_fack_count; |