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Herbert Xu 2ad41065d9 [TCP]: Clear stale pred_flags when snd_wnd changes ... This bug is responsible for causing the infamous "Treason uncloaked" messages that's been popping up everywhere since the printk was added. It has usually been blamed on foreign operating systems. However, some of those reports implicate Linux as both systems are running Linux or the TCP connection is going across the loopback interface. In fact, there really is a bug in the Linux TCP header prediction code that's been there since at least 2.1.8. This bug was tracked down with help from Dale Blount. The effect of this bug ranges from harmless "Treason uncloaked" messages to hung/aborted TCP connections. The details of the bug and fix is as follows. When snd_wnd is updated, we only update pred_flags if tcp_fast_path_check succeeds. When it fails (for example, when our rcvbuf is used up), we will leave pred_flags with an out-of-date snd_wnd value. When the out-of-date pred_flags happens to match the next incoming packet we will again hit the fast path and use the current snd_wnd which will be wrong. In the case of the treason messages, it just happens that the snd_wnd cached in pred_flags is zero while tp->snd_wnd is non-zero. Therefore when a zero-window packet comes in we incorrectly conclude that the window is non-zero. In fact if the peer continues to send us zero-window pure ACKs we will continue making the same mistake. It's only when the peer transmits a zero-window packet with data attached that we get a chance to snap out of it. This is what triggers the treason message at the next retransmit timeout. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>		20 years ago
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802	[TR]: Preserve RIF flag even for 2 byte RIF fields.	20 years ago
8021q	…
appletalk	…
atm	[PATCH] gfp flags annotations - part 1	20 years ago
ax25	…
bluetooth	[PATCH] gfp flags annotations - part 1	20 years ago
bridge	[NETFILTER]: Fix OOPSes on machines with discontiguous cpu numbering.	20 years ago
core	[PATCH] kill massive wireless-related log spam	20 years ago
dccp	[DCCP]: Clear the IPCB area	20 years ago
decnet	[PATCH] gfp flags annotations - part 1	20 years ago
econet	…
ethernet	…
ieee80211	[PATCH] gfp flags annotations - part 1	20 years ago
ipv4	[TCP]: Clear stale pred_flags when snd_wnd changes	20 years ago
ipv6	[IPV6]: Fix refcnt of struct ip6_flowlabel	20 years ago
ipx	…
irda	…
key	[PATCH] gfp flags annotations - part 1	20 years ago
lapb	…
llc	[PATCH] gfp flags annotations - part 1	20 years ago
netfilter	[NETFILTER] nfnetlink: use highest bit of nfa_type to indicate nested TLV	20 years ago
netlink	[PATCH] gfp flags annotations - part 1	20 years ago
netrom	…
packet	…
rose	…
rxrpc	[PATCH] gfp flags annotations - part 1	20 years ago
sched	[NET]: Disable NET_SCH_CLK_CPU for SMP x86 hosts	20 years ago
sctp	[PATCH] gfp flags annotations - part 1	20 years ago
sunrpc	[PATCH] svcsock timestamp fix	20 years ago
unix	…
wanrouter	…
x25	…
xfrm	[PATCH] gfp flags annotations - part 1	20 years ago
Kconfig	…
Makefile	…
TUNABLE	…
compat.c	…
nonet.c	…
socket.c	…
sysctl_net.c	…