From 631449d5d03506295eaa6947c1b0e8a168a2f6b7 Mon Sep 17 00:00:00 2001 From: Randall Stewart Date: Mon, 24 May 2021 14:42:15 -0400 Subject: [PATCH] tcp: Fix an issue with the PUSH bit as well as fill in the missing mtu change for fsb's The push bit itself was also not actually being properly moved to the right edge. The FIN bit was incorrectly on the left edge. We fix these two issues as well as plumb in the mtu_change for alternate stacks. Reviewed by: mtuexen Sponsored by: Netflix Inc Differential Revision: https://reviews.freebsd.org/D30413 --- sys/netinet/tcp_stacks/rack.c | 8 ++++++-- sys/netinet/tcp_subr.c | 9 +++++++++ 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c index 2713554626e9..84e330efa74a 100644 --- a/sys/netinet/tcp_stacks/rack.c +++ b/sys/netinet/tcp_stacks/rack.c @@ -6058,8 +6058,12 @@ rack_clone_rsm(struct tcp_rack *rack, struct rack_sendmap *nrsm, if (nrsm->r_flags & RACK_HAS_SYN) nrsm->r_flags &= ~RACK_HAS_SYN; /* Now if we have a FIN flag we keep it on the right edge */ - if (nrsm->r_flags & RACK_HAS_FIN) - nrsm->r_flags &= ~RACK_HAS_FIN; + if (rsm->r_flags & RACK_HAS_FIN) + rsm->r_flags &= ~RACK_HAS_FIN; + /* Push bit must go to the right edge as well */ + if (rsm->r_flags & RACK_HAD_PUSH) + rsm->r_flags &= ~RACK_HAD_PUSH; + /* * Now we need to find nrsm's new location in the mbuf chain * we basically calculate a new offset, which is soff + diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c index c44f26f78a2f..de22310d241a 100644 --- a/sys/netinet/tcp_subr.c +++ b/sys/netinet/tcp_subr.c @@ -3407,6 +3407,15 @@ tcp_mtudisc(struct inpcb *inp, int mtuoffer) tp->snd_recover = tp->snd_max; if (tp->t_flags & TF_SACK_PERMIT) EXIT_FASTRECOVERY(tp->t_flags); + if (tp->t_fb->tfb_tcp_mtu_chg != NULL) { + /* + * Conceptually the snd_nxt setting + * and freeing sack holes should + * be done by the default stacks + * own tfb_tcp_mtu_chg(). + */ + tp->t_fb->tfb_tcp_mtu_chg(tp); + } tp->t_fb->tfb_tcp_output(tp); }