projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 86af8b41 BB |
1 | /* Copyright (c) 2016 PLUMgrid |
| 2 | * | |
| 3 | * This program is free software; you can redistribute it and/or | |
| 4 | * modify it under the terms of version 2 of the GNU General Public | |
| 5 | * License as published by the Free Software Foundation. | |
| 6 | */ | |
| 7 | #define KBUILD_MODNAME "foo" | |
| 8 | #include <uapi/linux/bpf.h> | |
| 9 | #include <linux/in.h> | |
| 10 | #include <linux/if_ether.h> | |
| 11 | #include <linux/if_packet.h> | |
| 12 | #include <linux/if_vlan.h> | |
| 13 | #include <linux/ip.h> | |
| 14 | #include <linux/ipv6.h> | |
| 15 | #include "bpf_helpers.h" | |
| 16 | ||
| d9094bda | 17 | struct bpf_map_def SEC("maps") rxcnt = { |
| 86af8b41 BB |
18 | .type = BPF_MAP_TYPE_PERCPU_ARRAY, |
| 19 | .key_size = sizeof(u32), | |
| 20 | .value_size = sizeof(long), | |
| 21 | .max_entries = 256, | |
| 22 | }; | |
| 23 | ||
| 24 | static int parse_ipv4(void *data, u64 nh_off, void *data_end) | |
| 25 | { | |
| 26 | struct iphdr *iph = data + nh_off; | |
| 27 | ||
| 28 | if (iph + 1 > data_end) | |
| 29 | return 0; | |
| 30 | return iph->protocol; | |
| 31 | } | |
| 32 | ||
| 33 | static int parse_ipv6(void *data, u64 nh_off, void *data_end) | |
| 34 | { | |
| 35 | struct ipv6hdr *ip6h = data + nh_off; | |
| 36 | ||
| 37 | if (ip6h + 1 > data_end) | |
| 38 | return 0; | |
| 39 | return ip6h->nexthdr; | |
| 40 | } | |
| 41 | ||
| 42 | SEC("xdp1") | |
| 43 | int xdp_prog1(struct xdp_md *ctx) | |
| 44 | { | |
| 45 | void *data_end = (void *)(long)ctx->data_end; | |
| 46 | void *data = (void *)(long)ctx->data; | |
| 47 | struct ethhdr *eth = data; | |
| 48 | int rc = XDP_DROP; | |
| 49 | long *value; | |
| 50 | u16 h_proto; | |
| 51 | u64 nh_off; | |
| d9094bda | 52 | u32 ipproto; |
| 86af8b41 BB |
53 | |
| 54 | nh_off = sizeof(*eth); | |
| 55 | if (data + nh_off > data_end) | |
| 56 | return rc; | |
| 57 | ||
| 58 | h_proto = eth->h_proto; | |
| 59 | ||
| 60 | if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) { | |
| 61 | struct vlan_hdr *vhdr; | |
| 62 | ||
| 63 | vhdr = data + nh_off; | |
| 64 | nh_off += sizeof(struct vlan_hdr); | |
| 65 | if (data + nh_off > data_end) | |
| 66 | return rc; | |
| 67 | h_proto = vhdr->h_vlan_encapsulated_proto; | |
| 68 | } | |
| 69 | if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) { | |
| 70 | struct vlan_hdr *vhdr; | |
| 71 | ||
| 72 | vhdr = data + nh_off; | |
| 73 | nh_off += sizeof(struct vlan_hdr); | |
| 74 | if (data + nh_off > data_end) | |
| 75 | return rc; | |
| 76 | h_proto = vhdr->h_vlan_encapsulated_proto; | |
| 77 | } | |
| 78 | ||
| 79 | if (h_proto == htons(ETH_P_IP)) | |
| d9094bda | 80 | ipproto = parse_ipv4(data, nh_off, data_end); |
| 86af8b41 | 81 | else if (h_proto == htons(ETH_P_IPV6)) |
| d9094bda | 82 | ipproto = parse_ipv6(data, nh_off, data_end); |
| 86af8b41 | 83 | else |
| d9094bda | 84 | ipproto = 0; |
| 86af8b41 | 85 | |
| d9094bda | 86 | value = bpf_map_lookup_elem(&rxcnt, &ipproto); |
| 86af8b41 BB |
87 | if (value) |
| 88 | *value += 1; | |
| 89 | ||
| 90 | return rc; | |
| 91 | } | |
| 92 | ||
| 93 | char _license[] SEC("license") = "GPL"; |