The branch stable/13 has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=15077bc4b91fc9c98eb5cd743d8386de2d3c1336
commit 15077bc4b91fc9c98eb5cd743d8386de2d3c1336 Author: Michael Tuexen <[email protected]> AuthorDate: 2021-03-22 14:58:49 +0000 Commit: Michael Tuexen <[email protected]> CommitDate: 2021-06-02 21:20:26 +0000 tcp: improve handling of SYN segments in SYN-SENT state Ensure that the stack does not generate a DSACK block for user data received on a SYN segment in SYN-SENT state. Reviewed by: rscheff Differential Revision: https://reviews.freebsd.org/D29376 Sponsored by: Netflix, Inc. (cherry picked from commit 40f41ece765dc0b0907ca90796a1af4f4f89b2a0) --- sys/netinet/tcp_input.c | 4 +++- sys/netinet/tcp_stacks/bbr.c | 4 +++- sys/netinet/tcp_stacks/rack.c | 4 +++- 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index b3d4ef5cf5de..397cbc5084e6 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -3157,7 +3157,9 @@ dodata: /* XXX */ thflags = tcp_reass(tp, th, &temp, &tlen, m); tp->t_flags |= TF_ACKNOW; } - if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { + if ((tp->t_flags & TF_SACK_PERMIT) && + (save_tlen > 0) && + TCPS_HAVEESTABLISHED(tp->t_state)) { if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { /* * DSACK actually handled in the fastpath diff --git a/sys/netinet/tcp_stacks/bbr.c b/sys/netinet/tcp_stacks/bbr.c index 49ed7e992fba..cc20d6bf52ca 100644 --- a/sys/netinet/tcp_stacks/bbr.c +++ b/sys/netinet/tcp_stacks/bbr.c @@ -8371,7 +8371,9 @@ bbr_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, thflags = tcp_reass(tp, th, &temp, &tlen, m); tp->t_flags |= TF_ACKNOW; } - if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { + if ((tp->t_flags & TF_SACK_PERMIT) && + (save_tlen > 0) && + TCPS_HAVEESTABLISHED(tp->t_state)) { if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { /* * DSACK actually handled in the fastpath diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c index 4a883ee32c79..0ee73a95a6d7 100644 --- a/sys/netinet/tcp_stacks/rack.c +++ b/sys/netinet/tcp_stacks/rack.c @@ -8683,7 +8683,9 @@ rack_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, thflags = tcp_reass(tp, th, &temp, &tlen, m); tp->t_flags |= TF_ACKNOW; } - if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { + if ((tp->t_flags & TF_SACK_PERMIT) && + (save_tlen > 0) && + TCPS_HAVEESTABLISHED(tp->t_state)) { if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { /* * DSACK actually handled in the fastpath _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
