444 lines
9.3 KiB
C
444 lines
9.3 KiB
C
/* Copyright (c) 2016 VMware
|
|
* Copyright (c) 2016 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#define KBUILD_MODNAME "foo"
|
|
#include <uapi/linux/bpf.h>
|
|
#include <uapi/linux/if_ether.h>
|
|
#include <uapi/linux/if_packet.h>
|
|
#include <uapi/linux/ip.h>
|
|
#include <uapi/linux/ipv6.h>
|
|
#include <uapi/linux/in.h>
|
|
#include <uapi/linux/tcp.h>
|
|
#include <uapi/linux/filter.h>
|
|
#include <uapi/linux/pkt_cls.h>
|
|
#include <net/ipv6.h>
|
|
#include "bpf_helpers.h"
|
|
#include "bpf_endian.h"
|
|
|
|
#define _htonl __builtin_bswap32
|
|
#define ERROR(ret) do {\
|
|
char fmt[] = "ERROR line:%d ret:%d\n";\
|
|
bpf_trace_printk(fmt, sizeof(fmt), __LINE__, ret); \
|
|
} while(0)
|
|
|
|
struct geneve_opt {
|
|
__be16 opt_class;
|
|
u8 type;
|
|
u8 length:5;
|
|
u8 r3:1;
|
|
u8 r2:1;
|
|
u8 r1:1;
|
|
u8 opt_data[8]; /* hard-coded to 8 byte */
|
|
};
|
|
|
|
struct vxlan_metadata {
|
|
u32 gbp;
|
|
};
|
|
|
|
struct erspan_metadata {
|
|
__be32 index;
|
|
};
|
|
|
|
SEC("gre_set_tunnel")
|
|
int _gre_set_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
|
|
__builtin_memset(&key, 0x0, sizeof(key));
|
|
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
|
|
key.tunnel_id = 2;
|
|
key.tunnel_tos = 0;
|
|
key.tunnel_ttl = 64;
|
|
|
|
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("gre_get_tunnel")
|
|
int _gre_get_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
char fmt[] = "key %d remote ip 0x%x\n";
|
|
|
|
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt), key.tunnel_id, key.remote_ipv4);
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("erspan_set_tunnel")
|
|
int _erspan_set_tunnel(struct __sk_buff *skb)
|
|
{
|
|
struct bpf_tunnel_key key;
|
|
struct erspan_metadata md;
|
|
int ret;
|
|
|
|
__builtin_memset(&key, 0x0, sizeof(key));
|
|
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
|
|
key.tunnel_id = 2;
|
|
key.tunnel_tos = 0;
|
|
key.tunnel_ttl = 64;
|
|
|
|
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
md.index = htonl(123);
|
|
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("erspan_get_tunnel")
|
|
int _erspan_get_tunnel(struct __sk_buff *skb)
|
|
{
|
|
char fmt[] = "key %d remote ip 0x%x erspan index 0x%x\n";
|
|
struct bpf_tunnel_key key;
|
|
struct erspan_metadata md;
|
|
u32 index;
|
|
int ret;
|
|
|
|
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md));
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
index = bpf_ntohl(md.index);
|
|
bpf_trace_printk(fmt, sizeof(fmt),
|
|
key.tunnel_id, key.remote_ipv4, index);
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("vxlan_set_tunnel")
|
|
int _vxlan_set_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
struct vxlan_metadata md;
|
|
|
|
__builtin_memset(&key, 0x0, sizeof(key));
|
|
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
|
|
key.tunnel_id = 2;
|
|
key.tunnel_tos = 0;
|
|
key.tunnel_ttl = 64;
|
|
|
|
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
md.gbp = 0x800FF; /* Set VXLAN Group Policy extension */
|
|
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("vxlan_get_tunnel")
|
|
int _vxlan_get_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
struct vxlan_metadata md;
|
|
char fmt[] = "key %d remote ip 0x%x vxlan gbp 0x%x\n";
|
|
|
|
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md));
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt),
|
|
key.tunnel_id, key.remote_ipv4, md.gbp);
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("geneve_set_tunnel")
|
|
int _geneve_set_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret, ret2;
|
|
struct bpf_tunnel_key key;
|
|
struct geneve_opt gopt;
|
|
|
|
__builtin_memset(&key, 0x0, sizeof(key));
|
|
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
|
|
key.tunnel_id = 2;
|
|
key.tunnel_tos = 0;
|
|
key.tunnel_ttl = 64;
|
|
|
|
__builtin_memset(&gopt, 0x0, sizeof(gopt));
|
|
gopt.opt_class = 0x102; /* Open Virtual Networking (OVN) */
|
|
gopt.type = 0x08;
|
|
gopt.r1 = 0;
|
|
gopt.r2 = 0;
|
|
gopt.r3 = 0;
|
|
gopt.length = 2; /* 4-byte multiple */
|
|
*(int *) &gopt.opt_data = 0xdeadbeef;
|
|
|
|
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
ret = bpf_skb_set_tunnel_opt(skb, &gopt, sizeof(gopt));
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("geneve_get_tunnel")
|
|
int _geneve_get_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
struct geneve_opt gopt;
|
|
char fmt[] = "key %d remote ip 0x%x geneve class 0x%x\n";
|
|
|
|
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt));
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt),
|
|
key.tunnel_id, key.remote_ipv4, gopt.opt_class);
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("ipip_set_tunnel")
|
|
int _ipip_set_tunnel(struct __sk_buff *skb)
|
|
{
|
|
struct bpf_tunnel_key key = {};
|
|
void *data = (void *)(long)skb->data;
|
|
struct iphdr *iph = data;
|
|
struct tcphdr *tcp = data + sizeof(*iph);
|
|
void *data_end = (void *)(long)skb->data_end;
|
|
int ret;
|
|
|
|
/* single length check */
|
|
if (data + sizeof(*iph) + sizeof(*tcp) > data_end) {
|
|
ERROR(1);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
key.tunnel_ttl = 64;
|
|
if (iph->protocol == IPPROTO_ICMP) {
|
|
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
|
|
} else {
|
|
if (iph->protocol != IPPROTO_TCP || iph->ihl != 5)
|
|
return TC_ACT_SHOT;
|
|
|
|
if (tcp->dest == htons(5200))
|
|
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
|
|
else if (tcp->dest == htons(5201))
|
|
key.remote_ipv4 = 0xac100165; /* 172.16.1.101 */
|
|
else
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("ipip_get_tunnel")
|
|
int _ipip_get_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
char fmt[] = "remote ip 0x%x\n";
|
|
|
|
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt), key.remote_ipv4);
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("ipip6_set_tunnel")
|
|
int _ipip6_set_tunnel(struct __sk_buff *skb)
|
|
{
|
|
struct bpf_tunnel_key key = {};
|
|
void *data = (void *)(long)skb->data;
|
|
struct iphdr *iph = data;
|
|
struct tcphdr *tcp = data + sizeof(*iph);
|
|
void *data_end = (void *)(long)skb->data_end;
|
|
int ret;
|
|
|
|
/* single length check */
|
|
if (data + sizeof(*iph) + sizeof(*tcp) > data_end) {
|
|
ERROR(1);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
key.remote_ipv6[0] = _htonl(0x2401db00);
|
|
key.tunnel_ttl = 64;
|
|
|
|
if (iph->protocol == IPPROTO_ICMP) {
|
|
key.remote_ipv6[3] = _htonl(1);
|
|
} else {
|
|
if (iph->protocol != IPPROTO_TCP || iph->ihl != 5) {
|
|
ERROR(iph->protocol);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
if (tcp->dest == htons(5200)) {
|
|
key.remote_ipv6[3] = _htonl(1);
|
|
} else if (tcp->dest == htons(5201)) {
|
|
key.remote_ipv6[3] = _htonl(2);
|
|
} else {
|
|
ERROR(tcp->dest);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
}
|
|
|
|
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("ipip6_get_tunnel")
|
|
int _ipip6_get_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
char fmt[] = "remote ip6 %x::%x\n";
|
|
|
|
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt), _htonl(key.remote_ipv6[0]),
|
|
_htonl(key.remote_ipv6[3]));
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("ip6ip6_set_tunnel")
|
|
int _ip6ip6_set_tunnel(struct __sk_buff *skb)
|
|
{
|
|
struct bpf_tunnel_key key = {};
|
|
void *data = (void *)(long)skb->data;
|
|
struct ipv6hdr *iph = data;
|
|
struct tcphdr *tcp = data + sizeof(*iph);
|
|
void *data_end = (void *)(long)skb->data_end;
|
|
int ret;
|
|
|
|
/* single length check */
|
|
if (data + sizeof(*iph) + sizeof(*tcp) > data_end) {
|
|
ERROR(1);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
key.remote_ipv6[0] = _htonl(0x2401db00);
|
|
key.tunnel_ttl = 64;
|
|
|
|
if (iph->nexthdr == NEXTHDR_ICMP) {
|
|
key.remote_ipv6[3] = _htonl(1);
|
|
} else {
|
|
if (iph->nexthdr != NEXTHDR_TCP) {
|
|
ERROR(iph->nexthdr);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
if (tcp->dest == htons(5200)) {
|
|
key.remote_ipv6[3] = _htonl(1);
|
|
} else if (tcp->dest == htons(5201)) {
|
|
key.remote_ipv6[3] = _htonl(2);
|
|
} else {
|
|
ERROR(tcp->dest);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
}
|
|
|
|
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
SEC("ip6ip6_get_tunnel")
|
|
int _ip6ip6_get_tunnel(struct __sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct bpf_tunnel_key key;
|
|
char fmt[] = "remote ip6 %x::%x\n";
|
|
|
|
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6);
|
|
if (ret < 0) {
|
|
ERROR(ret);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
bpf_trace_printk(fmt, sizeof(fmt), _htonl(key.remote_ipv6[0]),
|
|
_htonl(key.remote_ipv6[3]));
|
|
return TC_ACT_OK;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|