/* * netsniff-ng - the packet sniffing beast * Copyright 2009, 2010 Daniel Borkmann. * Subject to the GPL, version 2. */ #include #include #include #include "proto.h" #include "protos.h" #include "pkt_buff.h" void empty(struct pkt_buff *pkt __maybe_unused) {} static void _hex(uint8_t *ptr, size_t len) { if (!len) return; tprintf(" [ Hex "); for (; ptr && len-- > 0; ptr++) tprintf(" %.2x", *ptr); tprintf(" ]\n"); } void hex(struct pkt_buff *pkt) { size_t len = pkt_len(pkt); if (!len) return; _hex(pkt_pull(pkt, len), len); tprintf("\n"); } static void _ascii(uint8_t *ptr, size_t len) { if (!len) return; tprintf(" [ Chr "); for (; ptr && len-- > 0; ptr++) tprintf("%c", isprint(*ptr) ? *ptr : '.'); tprintf(" ]\n"); } void ascii(struct pkt_buff *pkt) { size_t len = pkt_len(pkt); if (!len) return; _ascii(pkt_pull(pkt, len), len); tprintf("\n"); } void hex_ascii(struct pkt_buff *pkt) { size_t len = pkt_len(pkt); uint8_t *ptr = pkt_pull(pkt, len); if (len) { _ascii(ptr, len); _hex(ptr, len); } tprintf("\n"); } static void none_less(struct pkt_buff *pkt __maybe_unused) { tprintf("\n"); } struct protocol none_ops = { .key = 0x01, .print_full = hex_ascii, .print_less = none_less, }; option> net-next plumbingsTobias Klauser

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author	Gao Feng <fgao@ikuai8.com>	2016-07-23 19:21:47 +0800
committer	Pablo Neira Ayuso <pablo@netfilter.org>	2016-08-12 00:41:08 +0200
commit	e5e693ab49a95e1994979972eea224eefa81eba9 (patch)
tree	cf3ea62e374b6fcbeba3aa4cc089b61b3f57718d
parent	f08aff444ae0004c9ae6df3241fc313a5024d375 (diff)

netfilter: conntrack: Only need first 4 bytes to get l4proto ports

We only need first 4 bytes instead of 8 bytes to get the ports of tcp/udp/dccp/sctp/udplite in their pkt_to_tuple function. Signed-off-by: Gao Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>