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93 lines
2.1 KiB
93 lines
2.1 KiB
/* Copyright (c) 2016 PLUMgrid |
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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 <uapi/linux/bpf.h> |
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#include <linux/in.h> |
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#include <linux/if_ether.h> |
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#include <linux/if_packet.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 <bpf/bpf_helpers.h> |
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struct { |
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); |
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__type(key, u32); |
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__type(value, long); |
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__uint(max_entries, 256); |
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} rxcnt SEC(".maps"); |
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static int parse_ipv4(void *data, u64 nh_off, void *data_end) |
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{ |
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struct iphdr *iph = data + nh_off; |
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if (iph + 1 > data_end) |
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return 0; |
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return iph->protocol; |
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} |
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static int parse_ipv6(void *data, u64 nh_off, void *data_end) |
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{ |
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struct ipv6hdr *ip6h = data + nh_off; |
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if (ip6h + 1 > data_end) |
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return 0; |
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return ip6h->nexthdr; |
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} |
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SEC("xdp1") |
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int xdp_prog1(struct xdp_md *ctx) |
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{ |
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void *data_end = (void *)(long)ctx->data_end; |
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void *data = (void *)(long)ctx->data; |
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struct ethhdr *eth = data; |
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int rc = XDP_DROP; |
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long *value; |
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u16 h_proto; |
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u64 nh_off; |
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u32 ipproto; |
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nh_off = sizeof(*eth); |
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if (data + nh_off > data_end) |
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return rc; |
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h_proto = eth->h_proto; |
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if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(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 rc; |
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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_8021Q) || h_proto == htons(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 rc; |
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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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ipproto = parse_ipv4(data, nh_off, data_end); |
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else if (h_proto == htons(ETH_P_IPV6)) |
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ipproto = parse_ipv6(data, nh_off, data_end); |
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else |
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ipproto = 0; |
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value = bpf_map_lookup_elem(&rxcnt, &ipproto); |
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if (value) |
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*value += 1; |
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return rc; |
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} |
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char _license[] SEC("license") = "GPL";
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