Hello. I am currently writing a driver that uses the mark field in the sk_buff data structure. Particulars: 1.4.0 iptables (I want to use 1.4.3 but I'm getting some other strange thing in my embedded linux world...) Kernel 2.6.21.7 (mips 64 bit based) Cavium Processor So essentially I have dev->hard_start_xmit(..) function pointing to my tx routine. I'm noticing that if I setup a mark: ie. iptables -t mangle -A OUTPUT -j MARK --set-mark 3 iptables -t mangle -A OUTPUT -j LOG --log-prefix "mangle-out: " --log-level debug iptables -t filter -A OUTPUT -j LOG --log-prefix "filter-out: " --log-level debug iptables -t mangle -A POSTROUTING -j LOG --log-prefix "mangle-postroute: " --log-level debug iptables -t nat -A POSTROUTING -j LOG --log-prefix "nat-postroute: " --log-level debug Interfaces: pow0/pow1 (which is like eth0 and eth1) pow0: 10.100.100.109/24 pow1: 10.101.100.1/24 If I try to ping 10.100.100.1 (going out pow0) the mark seems to be removed by the time the mark gets down to my start_xmit routine. I'm trying to figure out where it's being removed or is there somewhere else I should be looking to get the mark? In the ipt_LOG.c I added a field to print out the MARK (and I snipped the rest of the message) mangle-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 filter-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 mangle-postroute: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 nat-postroute: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 mangle-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 filter-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 mangle-postroute: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 mangle-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 filter-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 mangle-postroute: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 mangle-out: IN= OUT=lo SRC=10.100.100.109 DST=10.100.100.109 LEN=112 TOS=0x00 PREC=0xC0 TTL=64 ID=49935 MARK=3 filter-out: IN= OUT=lo SRC=10.100.100.109 DST=10.100.100.109 LEN=112 TOS=0x00 PREC=0xC0 TTL=64 ID=49935 MARK=3 mangle-postroute: IN= OUT=lo SRC=10.100.100.109 DST=10.100.100.109 LEN=112 TOS=0x00 PREC=0xC0 TTL=64 ID=49935 MARK=3 mangle-out: IN= OUT=lo SRC=10.100.100.109 DST=10.100.100.109 LEN=112 TOS=0x00 PREC=0xC0 TTL=64 ID=49936 MARK=3 filter-out: IN= OUT=lo SRC=10.100.100.109 DST=10.100.100.109 LEN=112 TOS=0x00 PREC=0xC0 TTL=64 ID=49936 MARK=3 mangle-postroute: IN= OUT=lo SRC=10.100.100.109 DST=10.100.100.109 LEN=112 TOS=0x00 PREC=0xC0 TTL=64 ID=49936 MARK=3 My debug in the hard_xmit which shows that mark field is 0. mangle-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 DF PROTO=ICMP TYPE=8 CODE=0 ID=840 SEQ=1 filter-out: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 DF PROTO=ICMP TYPE=8 CODE=0 ID=840 SEQ=1 mangle-postroute: IN= OUT=pow0 SRC=10.100.100.109 DST=10.100.100.1 LEN=84 TOS=0x00 PREC=0x00 TTL=64 ID=0 MARK=3 DF PROTO=ICMP TYPE=8 CODE=0 ID=840 cvm_oct_xmit_pow:[397]-> pow0: Sending to group 14 and mark is 0 The value of mark that I print out is sk_buff->mark. How can this be?? Thanks in advance for any help you can give me.... back to walking backwards up the stack... :) -- /* * Steve Iribarne * Software Engineer * (aka Grunt) */ -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
