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Merge pull request #16337 from FRRouting/mergify/bp/stable/9.1/pr-16226

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ldpd: fix wrong gtsm count (backport #16226)
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Donald Sharp 2024-07-03 08:41:37 -04:00 committed by GitHub
commit badb6f1fce
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1 changed files with 12 additions and 0 deletions
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ldpd/neighbor.c
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@ -690,6 +690,18 @@ nbr_gtsm_setup(int fd, int af, struct nbr_params *nbrp)
if (nbrp && CHECK_FLAG(nbrp->flags, F_NBRP_GTSM_HOPS))
ttl = 256 - nbrp->gtsm_hops;
/*
* In linux networking stack, the received mpls packets
* will be processed by the host twice, one as mpls packet,
* the other as ip packet, so its ttl will be decreased 1.
* This behavior is based on the new kernel (5.10 and 6.1),
* and older versions may behave differently.
*
* Here, decrease 1 for IP_MINTTL if GTSM is enabled.
* And this workaround makes the GTSM mechanism a bit deviation.
*/
ttl -= 1;
switch (af) {
case AF_INET:
if (sock_set_ipv4_minttl(fd, ttl) == -1)