383 lines
8.1 KiB
C
383 lines
8.1 KiB
C
/* 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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