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mrouter: do not loopback packets unconditionally

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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
This commit is contained in:
Wojciech Macek 2021-04-23 08:49:27 +02:00
parent 65634ae748
commit 0b103f7237
1 changed files with 3 additions and 1 deletions
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4
sys/netinet/ip_mroute.c
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@ -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);