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| author | Wojciech Macek <wma@FreeBSD.org> | 2021-04-23 06:49:27 +0000 |
|---|---|---|
| committer | Wojciech Macek <wma@FreeBSD.org> | 2021-05-11 10:36:07 +0000 |
| commit | 0b103f72376b5ec7c9a9d574c976e42805ae88a4 (patch) | |
| tree | 39e8a870f22cc559e181a8906b5cf07eda12159e | |
| parent | 65634ae748e7f6b7b9f11e8838c65060c3f31347 (diff) | |
| download | src-0b103f72376b5ec7c9a9d574c976e42805ae88a4.tar.gz src-0b103f72376b5ec7c9a9d574c976e42805ae88a4.zip | |
mrouter: do not loopback packets unconditionally
Looping back router multicast traffic signifficantly
stresses network stack. Add possibility to disable or enable
loopbacked based on sysctl value.
Reported by: Daniel Deville
Reviewed by: mw
Differential Revision: https://reviews.freebsd.org/D29947
| -rw-r--r-- | sys/netinet/ip_mroute.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/netinet/ip_mroute.c b/sys/netinet/ip_mroute.c index 8ecc983ea58f..b8e677ba9af1 100644 --- a/sys/netinet/ip_mroute.c +++ b/sys/netinet/ip_mroute.c @@ -244,6 +244,8 @@ static const struct encaptab *pim_encap_cookie; static int pim_encapcheck(const struct mbuf *, int, int, void *); static int pim_input(struct mbuf *, int, int, void *); +extern int in_mcast_loop; + static const struct encap_config ipv4_encap_cfg = { .proto = IPPROTO_PIM, .min_length = sizeof(struct ip) + PIM_MINLEN, @@ -1685,7 +1687,7 @@ send_packet(struct vif *vifp, struct mbuf *m) imo.imo_multicast_ifp = vifp->v_ifp; imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1; - imo.imo_multicast_loop = 1; + imo.imo_multicast_loop = !!in_mcast_loop; imo.imo_multicast_vif = -1; STAILQ_INIT(&imo.imo_head); |