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linux PF_PACKET socket priority設(shè)置問(wèn)題 [復(fù)制鏈接]

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發(fā)表于 2012-02-08 21:35 |只看該作者 |倒序?yàn)g覽
想請(qǐng)教如何提高linux 鏈路層socket priority?謝謝!

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發(fā)表于 2012-02-08 22:17 |只看該作者
自己頂一個(gè),

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發(fā)表于 2012-02-09 20:24 |只看該作者
It seems that there is nothing that can capture the skb->priority
outside the kernel.

There is an iptables *target* "CLASSIFY", which can *set* skb->priority,
but there is no iptables *match* based on it.

tcpdump/pcap/PF_PACKET are oblivious to skb->priority.

netfilter netlink queue can export the skb->mark like the right
mechanism, but it doesn't touch skb->priority anywhere.   Perhaps there
needs to be a another one in include/linux/netfilter/nfnetlink_queue.h:

enum nfqnl_attr_type {
        NFQA_UNSPEC,
        NFQA_PACKET_HDR,
        NFQA_VERDICT_HDR,               /* nfqnl_msg_verdict_hrd */
        NFQA_MARK,   
... etc
        NFQA_SKBPRIORITY

The specific use I'm thinking of now, is troubleshooting priority
queueing with "tc" by being able to log or tcpdump traffic for a
specific qdisc/class.

It might also be nice to be able to tcpdump and/or log packets going
into or out of a specific qdisc/class, but I'd settle for dumping
packets based on skb->priority.
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