mirror of
https://github.com/torvalds/linux
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7cf245a37e
Fix all files in samples/bpf to include libbpf header files with the bpf/
prefix, to be consistent with external users of the library. Also ensure
that all includes of exported libbpf header files (those that are exported
on 'make install' of the library) use bracketed includes instead of quoted.
To make sure no new files are introduced that doesn't include the bpf/
prefix in its include, remove tools/lib/bpf from the include path entirely,
and use tools/lib instead.
Fixes: 6910d7d386 ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/* Copyright (c) 2016 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#define KBUILD_MODNAME "foo"
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/in.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <uapi/linux/bpf.h>
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#include <net/ip.h>
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#include <bpf/bpf_helpers.h>
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#define DEFAULT_PKTGEN_UDP_PORT 9
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#define DEBUG 0
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static int tcp(void *data, uint64_t tp_off, void *data_end)
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{
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struct tcphdr *tcp = data + tp_off;
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if (tcp + 1 > data_end)
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return 0;
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if (tcp->dest == htons(80) || tcp->source == htons(80))
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return TC_ACT_SHOT;
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return 0;
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}
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static int udp(void *data, uint64_t tp_off, void *data_end)
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{
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struct udphdr *udp = data + tp_off;
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if (udp + 1 > data_end)
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return 0;
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if (udp->dest == htons(DEFAULT_PKTGEN_UDP_PORT) ||
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udp->source == htons(DEFAULT_PKTGEN_UDP_PORT)) {
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if (DEBUG) {
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char fmt[] = "udp port 9 indeed\n";
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bpf_trace_printk(fmt, sizeof(fmt));
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}
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return TC_ACT_SHOT;
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}
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return 0;
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}
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static int parse_ipv4(void *data, uint64_t nh_off, void *data_end)
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{
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struct iphdr *iph;
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uint64_t ihl_len;
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iph = data + nh_off;
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if (iph + 1 > data_end)
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return 0;
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if (ip_is_fragment(iph))
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return 0;
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ihl_len = iph->ihl * 4;
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if (iph->protocol == IPPROTO_IPIP) {
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iph = data + nh_off + ihl_len;
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if (iph + 1 > data_end)
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return 0;
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ihl_len += iph->ihl * 4;
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}
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if (iph->protocol == IPPROTO_TCP)
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return tcp(data, nh_off + ihl_len, data_end);
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else if (iph->protocol == IPPROTO_UDP)
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return udp(data, nh_off + ihl_len, data_end);
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return 0;
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}
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static int parse_ipv6(void *data, uint64_t nh_off, void *data_end)
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{
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struct ipv6hdr *ip6h;
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struct iphdr *iph;
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uint64_t ihl_len = sizeof(struct ipv6hdr);
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uint64_t nexthdr;
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ip6h = data + nh_off;
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if (ip6h + 1 > data_end)
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return 0;
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nexthdr = ip6h->nexthdr;
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if (nexthdr == IPPROTO_IPIP) {
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iph = data + nh_off + ihl_len;
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if (iph + 1 > data_end)
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return 0;
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ihl_len += iph->ihl * 4;
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nexthdr = iph->protocol;
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} else if (nexthdr == IPPROTO_IPV6) {
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ip6h = data + nh_off + ihl_len;
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if (ip6h + 1 > data_end)
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return 0;
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ihl_len += sizeof(struct ipv6hdr);
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nexthdr = ip6h->nexthdr;
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}
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if (nexthdr == IPPROTO_TCP)
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return tcp(data, nh_off + ihl_len, data_end);
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else if (nexthdr == IPPROTO_UDP)
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return udp(data, nh_off + ihl_len, data_end);
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return 0;
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}
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SEC("varlen")
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int handle_ingress(struct __sk_buff *skb)
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{
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void *data = (void *)(long)skb->data;
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struct ethhdr *eth = data;
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void *data_end = (void *)(long)skb->data_end;
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uint64_t h_proto, nh_off;
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nh_off = sizeof(*eth);
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if (data + nh_off > data_end)
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return 0;
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h_proto = eth->h_proto;
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if (h_proto == ETH_P_8021Q || h_proto == ETH_P_8021AD) {
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struct vlan_hdr *vhdr;
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vhdr = data + nh_off;
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nh_off += sizeof(struct vlan_hdr);
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if (data + nh_off > data_end)
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return 0;
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h_proto = vhdr->h_vlan_encapsulated_proto;
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}
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if (h_proto == ETH_P_8021Q || h_proto == ETH_P_8021AD) {
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struct vlan_hdr *vhdr;
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vhdr = data + nh_off;
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nh_off += sizeof(struct vlan_hdr);
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if (data + nh_off > data_end)
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return 0;
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h_proto = vhdr->h_vlan_encapsulated_proto;
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}
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if (h_proto == htons(ETH_P_IP))
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return parse_ipv4(data, nh_off, data_end);
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else if (h_proto == htons(ETH_P_IPV6))
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return parse_ipv6(data, nh_off, data_end);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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