FreeBSD Bugzilla – Attachment 184680 Details for
Bug 217637
One TCP connection accepted TWO times
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[patch]
patch to not send acks in this case
file_217637.txt (text/plain), 672 bytes, created by
Richard Russo
on 2017-07-24 22:09:05 UTC
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Description:
patch to not send acks in this case
Filename:
MIME Type:
Creator:
Richard Russo
Created:
2017-07-24 22:09:05 UTC
Size:
672 bytes
patch
obsolete
>--- sys/netinet/tcp_input.c (revision 321101) >+++ sys/netinet/tcp_input.c (working copy) >@@ -2455,7 +2455,11 @@ > case TCPS_LAST_ACK: > if (SEQ_GT(th->th_ack, tp->snd_max)) { > TCPSTAT_INC(tcps_rcvacktoomuch); >- goto dropafterack; >+ // This violates RFC 793, which says an unacceptable segment >+ // must elicit only an empty acknowledgment segment, but likely >+ // indicates spoofing or a desynchronized TCP state, sending >+ // empty acks won't be helpful in either case >+ goto drop; > } > if ((tp->t_flags & TF_SACK_PERMIT) && > ((to.to_flags & TOF_SACK) ||
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