// SPDX-License-Identifier: GPL-2.0
/* 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.
*/
#include "vmlinux.h"
#include <bpf/bpf_core_read.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#include "bpf_kfuncs.h"
#include "bpf_tracing_net.h"
#define log_err(__ret) bpf_printk("ERROR line:%d ret:%d\n", __LINE__, __ret)
#define VXLAN_UDP_PORT 4789
#define ETH_P_IP 0x0800
#define PACKET_HOST 0
#define TUNNEL_CSUM bpf_htons(0x01)
#define TUNNEL_KEY bpf_htons(0x04)
/* Only IPv4 address assigned to veth1.
* 172.16.1.200
*/
#define ASSIGNED_ADDR_VETH1 0xac1001c8
struct bpf_fou_encap___local {
__be16 sport;
__be16 dport;
} __attribute__((preserve_access_index));
enum bpf_fou_encap_type___local {
FOU_BPF_ENCAP_FOU___local,
FOU_BPF_ENCAP_GUE___local,
};
struct bpf_fou_encap;
int bpf_skb_set_fou_encap(struct __sk_buff *skb_ctx,
struct bpf_fou_encap *encap, int type) __ksym;
int bpf_skb_get_fou_encap(struct __sk_buff *skb_ctx,
struct bpf_fou_encap *encap) __ksym;
struct xfrm_state *
bpf_xdp_get_xfrm_state(struct xdp_md *ctx, struct bpf_xfrm_state_opts *opts,
u32 opts__sz) __ksym;
void bpf_xdp_xfrm_state_release(struct xfrm_state *x) __ksym;
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u32);
} local_ip_map SEC(".maps");
SEC("tc")
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 | BPF_F_SEQ_NUMBER);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int gre_set_tunnel_no_key(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_ttl = 64;
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_ZERO_CSUM_TX | BPF_F_SEQ_NUMBER |
BPF_F_NO_TUNNEL_KEY);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int gre_get_tunnel(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_printk("key %d remote ip 0x%x\n", key.tunnel_id, key.remote_ipv4);
return TC_ACT_OK;
}
SEC("tc")
int ip6gretap_set_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
int ret;
__builtin_memset(&key, 0x0, sizeof(key));
key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
key.tunnel_id = 2;
key.tunnel_tos = 0;
key.tunnel_ttl = 64;
key.tunnel_label = 0xabcde;
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
BPF_F_SEQ_NUMBER);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ip6gretap_get_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
int ret;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_printk("key %d remote ip6 ::%x label %x\n",
key.tunnel_id, key.remote_ipv6[3], key.tunnel_label);
return TC_ACT_OK;
}
SEC("tc")
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) {
log_err(ret);
return TC_ACT_SHOT;
}
__builtin_memset(&md, 0, sizeof(md));
#ifdef ERSPAN_V1
md.version = 1;
md.u.index = bpf_htonl(123);
#else
__u8 direction = 1;
__u8 hwid = 7;
md.version = 2;
BPF_CORE_WRITE_BITFIELD(&md.u.md2, dir, direction);
BPF_CORE_WRITE_BITFIELD(&md.u.md2, hwid, (hwid & 0xf));
BPF_CORE_WRITE_BITFIELD(&md.u.md2, hwid_upper, (hwid >> 4) & 0x3);
#endif
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int erspan_get_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
struct erspan_metadata md;
int ret;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_printk("key %d remote ip 0x%x erspan version %d\n",
key.tunnel_id, key.remote_ipv4, md.version);
#ifdef ERSPAN_V1
index = bpf_ntohl(md.u.index);
bpf_printk("\tindex %x\n", index);
#else
bpf_printk("\tdirection %d hwid %x timestamp %u\n",
BPF_CORE_READ_BITFIELD(&md.u.md2, dir),
(BPF_CORE_READ_BITFIELD(&md.u.md2, hwid_upper) << 4) +
BPF_CORE_READ_BITFIELD(&md.u.md2, hwid),
bpf_ntohl(md.u.md2.timestamp));
#endif
return TC_ACT_OK;
}
SEC("tc")
int ip4ip6erspan_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_ipv6[3] = bpf_htonl(0x11);
key.tunnel_id = 2;
key.tunnel_tos = 0;
key.tunnel_ttl = 64;
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
__builtin_memset(&md, 0, sizeof(md));
#ifdef ERSPAN_V1
md.u.index = bpf_htonl(123);
md.version = 1;
#else
__u8 direction = 0;
__u8 hwid = 17;
md.version = 2;
BPF_CORE_WRITE_BITFIELD(&md.u.md2, dir, direction);
BPF_CORE_WRITE_BITFIELD(&md.u.md2, hwid, (hwid & 0xf));
BPF_CORE_WRITE_BITFIELD(&md.u.md2, hwid_upper, (hwid >> 4) & 0x3);
#endif
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ip4ip6erspan_get_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
struct erspan_metadata md;
int ret;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_printk("ip6erspan get key %d remote ip6 ::%x erspan version %d\n",
key.tunnel_id, key.remote_ipv4, md.version);
#ifdef ERSPAN_V1
index = bpf_ntohl(md.u.index);
bpf_printk("\tindex %x\n", index);
#else
bpf_printk("\tdirection %d hwid %x timestamp %u\n",
BPF_CORE_READ_BITFIELD(&md.u.md2, dir),
(BPF_CORE_READ_BITFIELD(&md.u.md2, hwid_upper) << 4) +
BPF_CORE_READ_BITFIELD(&md.u.md2, hwid),
bpf_ntohl(md.u.md2.timestamp));
#endif
return TC_ACT_OK;
}
SEC("tc")
int vxlan_set_tunnel_dst(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
struct vxlan_metadata md;
__u32 index = 0;
__u32 *local_ip = NULL;
int ret = 0;
local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
if (!local_ip) {
log_err(ret);
return TC_ACT_SHOT;
}
__builtin_memset(&key, 0x0, sizeof(key));
key.local_ipv4 = 0xac100164; /* 172.16.1.100 */
key.remote_ipv4 = *local_ip;
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) {
log_err(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) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int vxlan_set_tunnel_src(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
struct vxlan_metadata md;
__u32 index = 0;
__u32 *local_ip = NULL;
int ret = 0;
local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
if (!local_ip) {
log_err(ret);
return TC_ACT_SHOT;
}
__builtin_memset(&key, 0x0, sizeof(key));
key.local_ipv4 = *local_ip;
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) {
log_err(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) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int vxlan_get_tunnel_src(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key;
struct vxlan_metadata md;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_FLAGS);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
if (key.local_ipv4 != ASSIGNED_ADDR_VETH1 || md.gbp != 0x800FF ||
!(key.tunnel_flags & TUNNEL_KEY) ||
(key.tunnel_flags & TUNNEL_CSUM)) {
bpf_printk("vxlan key %d local ip 0x%x remote ip 0x%x gbp 0x%x flags 0x%x\n",
key.tunnel_id, key.local_ipv4,
key.remote_ipv4, md.gbp,
bpf_ntohs(key.tunnel_flags));
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int veth_set_outer_dst(struct __sk_buff *skb)
{
struct ethhdr *eth = (struct ethhdr *)(long)skb->data;
__u32 assigned_ip = bpf_htonl(ASSIGNED_ADDR_VETH1);
void *data_end = (void *)(long)skb->data_end;
struct udphdr *udph;
struct iphdr *iph;
int ret = 0;
__s64 csum;
if ((void *)eth + sizeof(*eth) > data_end) {
log_err(ret);
return TC_ACT_SHOT;
}
if (eth->h_proto != bpf_htons(ETH_P_IP))
return TC_ACT_OK;
iph = (struct iphdr *)(eth + 1);
if ((void *)iph + sizeof(*iph) > data_end) {
log_err(ret);
return TC_ACT_SHOT;
}
if (iph->protocol != IPPROTO_UDP)
return TC_ACT_OK;
udph = (struct udphdr *)(iph + 1);
if ((void *)udph + sizeof(*udph) > data_end) {
log_err(ret);
return TC_ACT_SHOT;
}
if (udph->dest != bpf_htons(VXLAN_UDP_PORT))
return TC_ACT_OK;
if (iph->daddr != assigned_ip) {
csum = bpf_csum_diff(&iph->daddr, sizeof(__u32), &assigned_ip,
sizeof(__u32), 0);
if (bpf_skb_store_bytes(skb, ETH_HLEN + offsetof(struct iphdr, daddr),
&assigned_ip, sizeof(__u32), 0) < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
if (bpf_l3_csum_replace(skb, ETH_HLEN + offsetof(struct iphdr, check),
0, csum, 0) < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_skb_change_type(skb, PACKET_HOST);
}
return TC_ACT_OK;
}
SEC("tc")
int ip6vxlan_set_tunnel_dst(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
__u32 index = 0;
__u32 *local_ip;
int ret = 0;
local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
if (!local_ip) {
log_err(ret);
return TC_ACT_SHOT;
}
__builtin_memset(&key, 0x0, sizeof(key));
key.local_ipv6[3] = bpf_htonl(0x11); /* ::11 */
key.remote_ipv6[3] = bpf_htonl(*local_ip);
key.tunnel_id = 22;
key.tunnel_tos = 0;
key.tunnel_ttl = 64;
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ip6vxlan_set_tunnel_src(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
__u32 index = 0;
__u32 *local_ip;
int ret = 0;
local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
if (!local_ip) {
log_err(ret);
return TC_ACT_SHOT;
}
__builtin_memset(&key, 0x0, sizeof(key));
key.local_ipv6[3] = bpf_htonl(*local_ip);
key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
key.tunnel_id = 22;
key.tunnel_tos = 0;
key.tunnel_ttl = 64;
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ip6vxlan_get_tunnel_src(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
__u32 index = 0;
__u32 *local_ip;
int ret = 0;
local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
if (!local_ip) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6 | BPF_F_TUNINFO_FLAGS);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
if (bpf_ntohl(key.local_ipv6[3]) != *local_ip ||
!(key.tunnel_flags & TUNNEL_KEY) ||
!(key.tunnel_flags & TUNNEL_CSUM)) {
bpf_printk("ip6vxlan key %d local ip6 ::%x remote ip6 ::%x label 0x%x flags 0x%x\n",
key.tunnel_id, bpf_ntohl(key.local_ipv6[3]),
bpf_ntohl(key.remote_ipv6[3]), key.tunnel_label,
bpf_ntohs(key.tunnel_flags));
bpf_printk("local_ip 0x%x\n", *local_ip);
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
struct local_geneve_opt {
struct geneve_opt gopt;
int data;
};
SEC("tc")
int geneve_set_tunnel(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key;
struct local_geneve_opt local_gopt;
struct geneve_opt *gopt = (struct geneve_opt *) &local_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(local_gopt));
gopt->opt_class = bpf_htons(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 = bpf_htonl(0xdeadbeef);
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_ZERO_CSUM_TX);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_set_tunnel_opt(skb, gopt, sizeof(local_gopt));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int geneve_get_tunnel(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key;
struct geneve_opt gopt;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt));
if (ret < 0)
gopt.opt_class = 0;
bpf_printk("key %d remote ip 0x%x geneve class 0x%x\n",
key.tunnel_id, key.remote_ipv4, gopt.opt_class);
return TC_ACT_OK;
}
SEC("tc")
int ip6geneve_set_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
struct local_geneve_opt local_gopt;
struct geneve_opt *gopt = (struct geneve_opt *) &local_gopt;
int ret;
__builtin_memset(&key, 0x0, sizeof(key));
key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
key.tunnel_id = 22;
key.tunnel_tos = 0;
key.tunnel_ttl = 64;
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
__builtin_memset(gopt, 0x0, sizeof(local_gopt));
gopt->opt_class = bpf_htons(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 = bpf_htonl(0xfeedbeef);
ret = bpf_skb_set_tunnel_opt(skb, gopt, sizeof(gopt));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ip6geneve_get_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key;
struct geneve_opt gopt;
int ret;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt));
if (ret < 0)
gopt.opt_class = 0;
bpf_printk("key %d remote ip 0x%x geneve class 0x%x\n",
key.tunnel_id, key.remote_ipv4, gopt.opt_class);
return TC_ACT_OK;
}
SEC("tc")
int ipip_set_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key = {};
void *data = (void *)(long)skb->data;
struct iphdr *iph = data;
void *data_end = (void *)(long)skb->data_end;
int ret;
/* single length check */
if (data + sizeof(*iph) > data_end) {
log_err(1);
return TC_ACT_SHOT;
}
key.tunnel_ttl = 64;
if (iph->protocol == IPPROTO_ICMP) {
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
}
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ipip_get_tunnel(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_printk("remote ip 0x%x\n", key.remote_ipv4);
return TC_ACT_OK;
}
SEC("tc")
int ipip_gue_set_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key = {};
struct bpf_fou_encap___local encap = {};
void *data = (void *)(long)skb->data;
struct iphdr *iph = data;
void *data_end = (void *)(long)skb->data_end;
int ret;
if (data + sizeof(*iph) > data_end) {
log_err(1);
return TC_ACT_SHOT;
}
key.tunnel_ttl = 64;
if (iph->protocol == IPPROTO_ICMP)
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
encap.sport = 0;
encap.dport = bpf_htons(5555);
ret = bpf_skb_set_fou_encap(skb, (struct bpf_fou_encap *)&encap,
bpf_core_enum_value(enum bpf_fou_encap_type___local,
FOU_BPF_ENCAP_GUE___local));
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ipip_fou_set_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key = {};
struct bpf_fou_encap___local encap = {};
void *data = (void *)(long)skb->data;
struct iphdr *iph = data;
void *data_end = (void *)(long)skb->data_end;
int ret;
if (data + sizeof(*iph) > data_end) {
log_err(1);
return TC_ACT_SHOT;
}
key.tunnel_ttl = 64;
if (iph->protocol == IPPROTO_ICMP)
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
encap.sport = 0;
encap.dport = bpf_htons(5555);
ret = bpf_skb_set_fou_encap(skb, (struct bpf_fou_encap *)&encap,
FOU_BPF_ENCAP_FOU___local);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ipip_encap_get_tunnel(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key = {};
struct bpf_fou_encap___local encap = {};
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
ret = bpf_skb_get_fou_encap(skb, (struct bpf_fou_encap *)&encap);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
if (bpf_ntohs(encap.dport) != 5555)
return TC_ACT_SHOT;
bpf_printk("%d remote ip 0x%x, sport %d, dport %d\n", ret,
key.remote_ipv4, bpf_ntohs(encap.sport),
bpf_ntohs(encap.dport));
return TC_ACT_OK;
}
SEC("tc")
int ipip6_set_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key = {};
void *data = (void *)(long)skb->data;
struct iphdr *iph = data;
void *data_end = (void *)(long)skb->data_end;
int ret;
/* single length check */
if (data + sizeof(*iph) > data_end) {
log_err(1);
return TC_ACT_SHOT;
}
__builtin_memset(&key, 0x0, sizeof(key));
key.tunnel_ttl = 64;
if (iph->protocol == IPPROTO_ICMP) {
key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
}
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ipip6_get_tunnel(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_printk("remote ip6 %x::%x\n", bpf_htonl(key.remote_ipv6[0]),
bpf_htonl(key.remote_ipv6[3]));
return TC_ACT_OK;
}
SEC("tc")
int ip6ip6_set_tunnel(struct __sk_buff *skb)
{
struct bpf_tunnel_key key = {};
void *data = (void *)(long)skb->data;
struct ipv6hdr *iph = data;
void *data_end = (void *)(long)skb->data_end;
int ret;
/* single length check */
if (data + sizeof(*iph) > data_end) {
log_err(1);
return TC_ACT_SHOT;
}
key.tunnel_ttl = 64;
if (iph->nexthdr == 58 /* NEXTHDR_ICMP */) {
key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
}
ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
return TC_ACT_OK;
}
SEC("tc")
int ip6ip6_get_tunnel(struct __sk_buff *skb)
{
int ret;
struct bpf_tunnel_key key;
ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
BPF_F_TUNINFO_IPV6);
if (ret < 0) {
log_err(ret);
return TC_ACT_SHOT;
}
bpf_printk("remote ip6 %x::%x\n", bpf_htonl(key.remote_ipv6[0]),
bpf_htonl(key.remote_ipv6[3]));
return TC_ACT_OK;
}
volatile int xfrm_reqid = 0;
volatile int xfrm_spi = 0;
volatile int xfrm_remote_ip = 0;
SEC("tc")
int xfrm_get_state(struct __sk_buff *skb)
{
struct bpf_xfrm_state x;
int ret;
ret = bpf_skb_get_xfrm_state(skb, 0, &x, sizeof(x), 0);
if (ret < 0)
return TC_ACT_OK;
xfrm_reqid = x.reqid;
xfrm_spi = bpf_ntohl(x.spi);
xfrm_remote_ip = bpf_ntohl(x.remote_ipv4);
return TC_ACT_OK;
}
volatile int xfrm_replay_window = 0;
SEC("xdp")
int xfrm_get_state_xdp(struct xdp_md *xdp)
{
struct bpf_xfrm_state_opts opts = {};
struct xfrm_state *x = NULL;
struct ip_esp_hdr *esph;
struct bpf_dynptr ptr;
u8 esph_buf[8] = {};
u8 iph_buf[20] = {};
struct iphdr *iph;
u32 off;
if (bpf_dynptr_from_xdp(xdp, 0, &ptr))
goto out;
off = sizeof(struct ethhdr);
iph = bpf_dynptr_slice(&ptr, off, iph_buf, sizeof(iph_buf));
if (!iph || iph->protocol != IPPROTO_ESP)
goto out;
off += sizeof(struct iphdr);
esph = bpf_dynptr_slice(&ptr, off, esph_buf, sizeof(esph_buf));
if (!esph)
goto out;
opts.netns_id = BPF_F_CURRENT_NETNS;
opts.daddr.a4 = iph->daddr;
opts.spi = esph->spi;
opts.proto = IPPROTO_ESP;
opts.family = AF_INET;
x = bpf_xdp_get_xfrm_state(xdp, &opts, sizeof(opts));
if (!x)
goto out;
if (!x->replay_esn)
goto out;
xfrm_replay_window = x->replay_esn->replay_window;
out:
if (x)
bpf_xdp_xfrm_state_release(x);
return XDP_PASS;
}
char _license[] SEC("license") = "GPL";