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382 lines
8.1 KiB
382 lines
8.1 KiB
/* Copyright (c) 2016 VMware |
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* 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 <uapi/linux/bpf.h> |
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#include <uapi/linux/if_ether.h> |
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#include <uapi/linux/if_packet.h> |
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#include <uapi/linux/ip.h> |
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#include <uapi/linux/ipv6.h> |
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#include <uapi/linux/in.h> |
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#include <uapi/linux/tcp.h> |
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#include <uapi/linux/filter.h> |
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#include <uapi/linux/pkt_cls.h> |
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#include <net/ipv6.h> |
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#include "bpf_helpers.h" |
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#define _htonl __builtin_bswap32 |
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#define ERROR(ret) do {\ |
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char fmt[] = "ERROR line:%d ret:%d\n";\ |
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bpf_trace_printk(fmt, sizeof(fmt), __LINE__, ret); \ |
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} while(0) |
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struct geneve_opt { |
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__be16 opt_class; |
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u8 type; |
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u8 length:5; |
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u8 r3:1; |
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u8 r2:1; |
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u8 r1:1; |
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u8 opt_data[8]; /* hard-coded to 8 byte */ |
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}; |
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struct vxlan_metadata { |
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u32 gbp; |
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}; |
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SEC("gre_set_tunnel") |
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int _gre_set_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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__builtin_memset(&key, 0x0, sizeof(key)); |
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key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
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key.tunnel_id = 2; |
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key.tunnel_tos = 0; |
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key.tunnel_ttl = 64; |
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ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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return TC_ACT_OK; |
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} |
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SEC("gre_get_tunnel") |
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int _gre_get_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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char fmt[] = "key %d remote ip 0x%x\n"; |
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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bpf_trace_printk(fmt, sizeof(fmt), key.tunnel_id, key.remote_ipv4); |
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return TC_ACT_OK; |
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} |
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SEC("vxlan_set_tunnel") |
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int _vxlan_set_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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struct vxlan_metadata md; |
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__builtin_memset(&key, 0x0, sizeof(key)); |
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key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
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key.tunnel_id = 2; |
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key.tunnel_tos = 0; |
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key.tunnel_ttl = 64; |
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ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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md.gbp = 0x800FF; /* Set VXLAN Group Policy extension */ |
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ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md)); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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return TC_ACT_OK; |
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} |
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SEC("vxlan_get_tunnel") |
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int _vxlan_get_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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struct vxlan_metadata md; |
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char fmt[] = "key %d remote ip 0x%x vxlan gbp 0x%x\n"; |
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md)); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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bpf_trace_printk(fmt, sizeof(fmt), |
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key.tunnel_id, key.remote_ipv4, md.gbp); |
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return TC_ACT_OK; |
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} |
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SEC("geneve_set_tunnel") |
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int _geneve_set_tunnel(struct __sk_buff *skb) |
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{ |
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int ret, ret2; |
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struct bpf_tunnel_key key; |
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struct geneve_opt gopt; |
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__builtin_memset(&key, 0x0, sizeof(key)); |
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key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
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key.tunnel_id = 2; |
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key.tunnel_tos = 0; |
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key.tunnel_ttl = 64; |
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__builtin_memset(&gopt, 0x0, sizeof(gopt)); |
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gopt.opt_class = 0x102; /* Open Virtual Networking (OVN) */ |
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gopt.type = 0x08; |
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gopt.r1 = 1; |
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gopt.r2 = 0; |
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gopt.r3 = 1; |
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gopt.length = 2; /* 4-byte multiple */ |
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*(int *) &gopt.opt_data = 0xdeadbeef; |
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ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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ret = bpf_skb_set_tunnel_opt(skb, &gopt, sizeof(gopt)); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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return TC_ACT_OK; |
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} |
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SEC("geneve_get_tunnel") |
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int _geneve_get_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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struct geneve_opt gopt; |
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char fmt[] = "key %d remote ip 0x%x geneve class 0x%x\n"; |
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt)); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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bpf_trace_printk(fmt, sizeof(fmt), |
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key.tunnel_id, key.remote_ipv4, gopt.opt_class); |
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return TC_ACT_OK; |
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} |
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SEC("ipip_set_tunnel") |
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int _ipip_set_tunnel(struct __sk_buff *skb) |
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{ |
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struct bpf_tunnel_key key = {}; |
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void *data = (void *)(long)skb->data; |
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struct iphdr *iph = data; |
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struct tcphdr *tcp = data + sizeof(*iph); |
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void *data_end = (void *)(long)skb->data_end; |
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int ret; |
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/* single length check */ |
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if (data + sizeof(*iph) + sizeof(*tcp) > data_end) { |
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ERROR(1); |
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return TC_ACT_SHOT; |
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} |
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key.tunnel_ttl = 64; |
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if (iph->protocol == IPPROTO_ICMP) { |
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key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
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} else { |
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if (iph->protocol != IPPROTO_TCP || iph->ihl != 5) |
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return TC_ACT_SHOT; |
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if (tcp->dest == htons(5200)) |
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key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
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else if (tcp->dest == htons(5201)) |
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key.remote_ipv4 = 0xac100165; /* 172.16.1.101 */ |
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else |
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return TC_ACT_SHOT; |
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} |
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ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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return TC_ACT_OK; |
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} |
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SEC("ipip_get_tunnel") |
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int _ipip_get_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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char fmt[] = "remote ip 0x%x\n"; |
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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bpf_trace_printk(fmt, sizeof(fmt), key.remote_ipv4); |
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return TC_ACT_OK; |
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} |
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SEC("ipip6_set_tunnel") |
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int _ipip6_set_tunnel(struct __sk_buff *skb) |
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{ |
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struct bpf_tunnel_key key = {}; |
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void *data = (void *)(long)skb->data; |
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struct iphdr *iph = data; |
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struct tcphdr *tcp = data + sizeof(*iph); |
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void *data_end = (void *)(long)skb->data_end; |
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int ret; |
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/* single length check */ |
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if (data + sizeof(*iph) + sizeof(*tcp) > data_end) { |
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ERROR(1); |
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return TC_ACT_SHOT; |
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} |
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key.remote_ipv6[0] = _htonl(0x2401db00); |
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key.tunnel_ttl = 64; |
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if (iph->protocol == IPPROTO_ICMP) { |
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key.remote_ipv6[3] = _htonl(1); |
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} else { |
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if (iph->protocol != IPPROTO_TCP || iph->ihl != 5) { |
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ERROR(iph->protocol); |
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return TC_ACT_SHOT; |
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} |
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if (tcp->dest == htons(5200)) { |
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key.remote_ipv6[3] = _htonl(1); |
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} else if (tcp->dest == htons(5201)) { |
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key.remote_ipv6[3] = _htonl(2); |
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} else { |
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ERROR(tcp->dest); |
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return TC_ACT_SHOT; |
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} |
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} |
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ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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return TC_ACT_OK; |
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} |
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SEC("ipip6_get_tunnel") |
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int _ipip6_get_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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char fmt[] = "remote ip6 %x::%x\n"; |
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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bpf_trace_printk(fmt, sizeof(fmt), _htonl(key.remote_ipv6[0]), |
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_htonl(key.remote_ipv6[3])); |
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return TC_ACT_OK; |
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} |
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SEC("ip6ip6_set_tunnel") |
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int _ip6ip6_set_tunnel(struct __sk_buff *skb) |
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{ |
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struct bpf_tunnel_key key = {}; |
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void *data = (void *)(long)skb->data; |
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struct ipv6hdr *iph = data; |
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struct tcphdr *tcp = data + sizeof(*iph); |
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void *data_end = (void *)(long)skb->data_end; |
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int ret; |
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/* single length check */ |
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if (data + sizeof(*iph) + sizeof(*tcp) > data_end) { |
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ERROR(1); |
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return TC_ACT_SHOT; |
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} |
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key.remote_ipv6[0] = _htonl(0x2401db00); |
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key.tunnel_ttl = 64; |
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if (iph->nexthdr == NEXTHDR_ICMP) { |
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key.remote_ipv6[3] = _htonl(1); |
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} else { |
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if (iph->nexthdr != NEXTHDR_TCP) { |
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ERROR(iph->nexthdr); |
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return TC_ACT_SHOT; |
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} |
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if (tcp->dest == htons(5200)) { |
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key.remote_ipv6[3] = _htonl(1); |
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} else if (tcp->dest == htons(5201)) { |
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key.remote_ipv6[3] = _htonl(2); |
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} else { |
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ERROR(tcp->dest); |
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return TC_ACT_SHOT; |
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} |
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} |
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ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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return TC_ACT_OK; |
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} |
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SEC("ip6ip6_get_tunnel") |
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int _ip6ip6_get_tunnel(struct __sk_buff *skb) |
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{ |
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int ret; |
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struct bpf_tunnel_key key; |
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char fmt[] = "remote ip6 %x::%x\n"; |
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
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if (ret < 0) { |
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ERROR(ret); |
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return TC_ACT_SHOT; |
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} |
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bpf_trace_printk(fmt, sizeof(fmt), _htonl(key.remote_ipv6[0]), |
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_htonl(key.remote_ipv6[3])); |
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return TC_ACT_OK; |
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} |
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char _license[] SEC("license") = "GPL";
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