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Add sysctl net.inet.ip.mcast.loop. This controls whether or not

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IPv4 multicast sends are looped back to senders by default
on a stack-wide basis, rather than relying on the socket option.
Note that the sysctl only applies to newly created multicast sockets.
This commit is contained in:
Bruce M Simpson 2009-03-04 03:40:02 +00:00
parent ad760e6fc9
commit dd7fd7c07c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=189357
1 changed files with 8 additions and 1 deletions
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9
sys/netinet/in_mcast.c
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@ -121,6 +121,13 @@ static int inp_leave_group(struct inpcb *, struct sockopt *);
static int inp_set_multicast_if(struct inpcb *, struct sockopt *);
static int inp_set_source_filters(struct inpcb *, struct sockopt *);
SYSCTL_NODE(_net_inet_ip, OID_AUTO, mcast, CTLFLAG_RW, 0, "IPv4 multicast");
int in_mcast_loop = IP_DEFAULT_MULTICAST_LOOP;
SYSCTL_INT(_net_inet_ip_mcast, OID_AUTO, loop, CTLFLAG_RW | CTLFLAG_TUN,
&in_mcast_loop, 0, "Loopback multicast datagrams by default");
TUNABLE_INT("net.inet.ip.mcast.loop", &in_mcast_loop);
/*
* Resize the ip_moptions vector to the next power-of-two minus 1.
* May be called with locks held; do not sleep.
@ -695,7 +702,7 @@ inp_findmoptions(struct inpcb *inp)
imo->imo_multicast_addr.s_addr = INADDR_ANY;
imo->imo_multicast_vif = -1;
imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
imo->imo_multicast_loop = in_mcast_loop;
imo->imo_num_memberships = 0;
imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
imo->imo_membership = immp;