Is udp_hdr/tcp_hdr valid in netfilters hook?

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Hi, wanted to know if udp_hdr/tcp_hdr can be safely used in context of
netfilter hooks to extract udp/tcp data from skb?
Netfilter is being registered with NF_IP_PRI_FILTER priority.

I am facing some issue with using udp_hdr/tcp_hdr on 2.6.32 kernels.
It doesn't provide the expected information but skb_header_pointer()
seems to work.

Not seeing this issue with 3.x/4.x kernels.

Regards,
Amit



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