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Add a knob to change default behavior of inheriting listen socket's tcp stack

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regardless of what the default stack for the system is set to.

With current/default behavior, after changing the default tcp stack, the
application needs to be restarted to pick up that change. Setting this new knob
net.inet.tcp.functions_inherit_listen_socket_stack to '0' would change that
behavior and make any new connection use the newly selected default tcp stack.

Reviewed by:		rrs
MFC after:		2 weeks
Sponsored by:		Limelight Networks
This commit is contained in:
hiren 2017-01-27 23:10:46 +00:00
parent ba9656082f
commit 845c485521
1 changed files with 9 additions and 1 deletions
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10
sys/netinet/tcp_syncache.c
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@ -120,6 +120,14 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, syncookies_only, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(tcp_syncookiesonly), 0,
"Use only TCP SYN cookies");
static VNET_DEFINE(int, functions_inherit_listen_socket_stack) = 1;
#define V_functions_inherit_listen_socket_stack \
VNET(functions_inherit_listen_socket_stack)
SYSCTL_INT(_net_inet_tcp, OID_AUTO, functions_inherit_listen_socket_stack,
CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(functions_inherit_listen_socket_stack), 0,
"Inherit listen socket's stack");
#ifdef TCP_OFFLOAD
#define ADDED_BY_TOE(sc) ((sc)->sc_tod != NULL)
#endif
@ -830,7 +838,7 @@ syncache_socket(struct syncache *sc, struct socket *lso, struct mbuf *m)
tcp_rcvseqinit(tp);
tcp_sendseqinit(tp);
blk = sototcpcb(lso)->t_fb;
if (blk != tp->t_fb) {
if (V_functions_inherit_listen_socket_stack && blk != tp->t_fb) {
/*
* Our parents t_fb was not the default,
* we need to release our ref on tp->t_fb and