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examples/bpf/t1.c
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Bruce Richardson
examples/bpf: move from test directory
26 фев 2019, 17:29
26 фев 2019, 17:29
25d11a8
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/* SPDX-License-Identifier: BSD-3-Clause * Copyright(c) 2018 Intel Corporation */ /* * eBPF program sample. * Accepts pointer to first segment packet data as an input parameter. * analog of tcpdump -s 1 -d 'dst 1.2.3.4 && udp && dst port 5000' * (000) ldh [12] * (001) jeq #0x800 jt 2 jf 12 * (002) ld [30] * (003) jeq #0x1020304 jt 4 jf 12 * (004) ldb [23] * (005) jeq #0x11 jt 6 jf 12 * (006) ldh [20] * (007) jset #0x1fff jt 12 jf 8 * (008) ldxb 4*([14]&0xf) * (009) ldh [x + 16] * (010) jeq #0x1388 jt 11 jf 12 * (011) ret #1 * (012) ret #0 * * To compile on x86: * clang -O2 -U __GNUC__ -target bpf -c t1.c * * To compile on ARM: * clang -O2 -I/usr/include/aarch64-linux-gnu/ -target bpf -c t1.c */ #include <stdint.h> #include <net/ethernet.h> #include <netinet/ip.h> #include <netinet/udp.h> #include <arpa/inet.h> uint64_t entry(void *pkt) { struct ether_header *ether_header = (void *)pkt; if (ether_header->ether_type != htons(0x0800)) return 0; struct iphdr *iphdr = (void *)(ether_header + 1); if (iphdr->protocol != 17 || (iphdr->frag_off & 0x1ffff) != 0 || iphdr->daddr != htonl(0x1020304)) return 0; int hlen = iphdr->ihl * 4; struct udphdr *udphdr = (void *)iphdr + hlen; if (udphdr->dest != htons(5000)) return 0; return 1; }