netsniff-ng.git - A high-performance Linux networking toolkit

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Age	Commit message (Collapse)	Author	Files	Lines
2013-05-21	tprintf: Rename parameter to avoid shadowing global declaration	Tobias Klauser	1	-2/+2
	The tprintf module already uses a static variable named 'buffer', thus rename the parameter to avoid a name clash. Found by compiling with -Wshadow. Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
2013-03-15	all: import netsniff-ng 0.5.8-rc0 source	Daniel Borkmann	1	-0/+169
	We decided to get rid of the old Git history and start a new one for several reasons: ) Allow / enforce only high-quality commits (which was not the case for many commits in the history), have a policy that is more close to the one from the Linux kernel. With high quality commits, we mean code that is logically split into commits and commit messages that are signed-off and have a proper subject and message body. We do not allow automatic Github merges anymore, since they are total bullshit. However, we will either cherry-pick your patches or pull them manually. ) The old archive was about ~27MB for no particular good reason. This basically derived from the bad decision that also some PDF files where stored there. From this moment onwards, no binary objects are allowed to be stored in this repository anymore. The old archive is not wiped away from the Internet. You will still be able to find it, e.g. on git.cryptoism.org etc. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

one iptable rule: iptables -I INPUT -p tcp --sport 12345 -m connbytes --connbytes 2: --connbytes-dir reply --connbytes-mode packets -j REJECT --reject-with tcp-reset This iptables rule could generate on TCP RST without ack flag. server:10.172.135.55 Enable the synproxy with seqadjust by the following iptables rules iptables -t raw -A PREROUTING -i eth0 -p tcp -d 10.172.135.55 --dport 12345 -m tcp --syn -j CT --notrack iptables -A INPUT -i eth0 -p tcp -d 10.172.135.55 --dport 12345 -m conntrack --ctstate INVALID,UNTRACKED -j SYNPROXY --sack-perm --timestamp --wscale 7 --mss 1460 iptables -A OUTPUT -o eth0 -p tcp -s 10.172.135.55 --sport 12345 -m conntrack --ctstate INVALID,UNTRACKED -m tcp --tcp-flags SYN,RST,ACK SYN,ACK -j ACCEPT The following is my test result. 1. packet trace on client root@routers:/tmp# tcpdump -i eth0 tcp port 12345 -n tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes IP 10.26.98.245.45154 > 10.172.135.55.12345: Flags [S], seq 3695959829, win 29200, options [mss 1460,sackOK,TS val 452367884 ecr 0,nop,wscale 7], length 0 IP 10.172.135.55.12345 > 10.26.98.245.45154: Flags [S.], seq 546723266, ack 3695959830, win 0, options [mss 1460,sackOK,TS val 15643479 ecr 452367884, nop,wscale 7], length 0 IP 10.26.98.245.45154 > 10.172.135.55.12345: Flags [.], ack 1, win 229, options [nop,nop,TS val 452367885 ecr 15643479], length 0 IP 10.172.135.55.12345 > 10.26.98.245.45154: Flags [.], ack 1, win 226, options [nop,nop,TS val 15643479 ecr 452367885], length 0 IP 10.26.98.245.45154 > 10.172.135.55.12345: Flags [R], seq 3695959830, win 0, length 0 2. seqadj log on server [62873.867319] Adjusting sequence number from 602341895->546723267, ack from 3695959830->3695959830 [62873.867644] Adjusting sequence number from 602341895->546723267, ack from 3695959830->3695959830 [62873.869040] Adjusting sequence number from 3695959830->3695959830, ack from 0->55618628 To summarize, it is clear that the seqadj codes adjust the 0 ack when receive one TCP RST packet without ack. Signed-off-by: Gao Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>