diff options
| author |   bluhm <bluhm@openbsd.org> | 2016-03-21 15:52:27 +0000 |
|---|---|---|
| committer | bluhm <bluhm@openbsd.org> | 2016-03-21 15:52:27 +0000 |
| commit | 2434a7d20d110cf0b57323c92059df148d7cb1e3 (patch) | |
| tree | 9a6feffa89549e49cb93c918a152764bbce4bdf2 /sys/netinet/tcp_input.c | |
| parent | Reduce the FUN() macro madness by no longer applying it to el_[w]getc(3). (diff) | |
| download | wireguard-openbsd-2434a7d20d110cf0b57323c92059df148d7cb1e3.tar.xz wireguard-openbsd-2434a7d20d110cf0b57323c92059df148d7cb1e3.zip | |
Add a tcps_sc_seedrandom counter in TCP SYN cache and netstat -s.
This shows how often the hash function is reseeded and the random
bucket distribution changes.
OK mpi@ claudio@
Diffstat (limited to 'sys/netinet/tcp_input.c')
| -rw-r--r-- | sys/netinet/tcp_input.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index b367d703ca6..7276b44598b 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -1,4 +1,4 @@ -/* $OpenBSD: tcp_input.c,v 1.314 2016/03/07 18:44:00 naddy Exp $ */ +/* $OpenBSD: tcp_input.c,v 1.315 2016/03/21 15:52:27 bluhm Exp $ */ /* $NetBSD: tcp_input.c,v 1.23 1996/02/13 23:43:44 christos Exp $ */ /* @@ -3371,8 +3371,10 @@ syn_cache_insert(struct syn_cache *sc, struct tcpcb *tp) * If there are no entries in the hash table, reinitialize * the hash secrets. */ - if (tcp_syn_cache_count == 0) + if (tcp_syn_cache_count == 0) { arc4random_buf(tcp_syn_hash, sizeof(tcp_syn_hash)); + tcpstat.tcps_sc_seedrandom++; + } SYN_HASHALL(sc->sc_hash, &sc->sc_src.sa, &sc->sc_dst.sa); sc->sc_bucketidx = sc->sc_hash % tcp_syn_cache_size; |