714 lines
15 KiB
C
714 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* 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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#include <stddef.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <linux/bpf.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/types.h>
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#include <linux/tcp.h>
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#include <linux/socket.h>
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#include <linux/pkt_cls.h>
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#include <linux/erspan.h>
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#include "bpf_helpers.h"
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#include "bpf_endian.h"
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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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int _version SEC("version") = 1;
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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),
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BPF_F_ZERO_CSUM_TX | BPF_F_SEQ_NUMBER);
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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("ip6gretap_set_tunnel")
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int _ip6gretap_set_tunnel(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key key;
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int ret;
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__builtin_memset(&key, 0x0, sizeof(key));
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key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
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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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key.tunnel_label = 0xabcde;
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ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key),
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BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
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BPF_F_SEQ_NUMBER);
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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("ip6gretap_get_tunnel")
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int _ip6gretap_get_tunnel(struct __sk_buff *skb)
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{
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char fmt[] = "key %d remote ip6 ::%x label %x\n";
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struct bpf_tunnel_key key;
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int ret;
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
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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),
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key.tunnel_id, key.remote_ipv6[3], key.tunnel_label);
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return TC_ACT_OK;
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}
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SEC("erspan_set_tunnel")
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int _erspan_set_tunnel(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key key;
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struct erspan_metadata md;
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int ret;
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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),
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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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__builtin_memset(&md, 0, sizeof(md));
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#ifdef ERSPAN_V1
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md.version = 1;
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md.u.index = bpf_htonl(123);
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#else
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__u8 direction = 1;
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__u8 hwid = 7;
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md.version = 2;
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md.u.md2.dir = direction;
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md.u.md2.hwid = hwid & 0xf;
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md.u.md2.hwid_upper = (hwid >> 4) & 0x3;
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#endif
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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("erspan_get_tunnel")
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int _erspan_get_tunnel(struct __sk_buff *skb)
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{
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char fmt[] = "key %d remote ip 0x%x erspan version %d\n";
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struct bpf_tunnel_key key;
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struct erspan_metadata md;
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__u32 index;
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int ret;
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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.version);
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#ifdef ERSPAN_V1
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char fmt2[] = "\tindex %x\n";
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index = bpf_ntohl(md.u.index);
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bpf_trace_printk(fmt2, sizeof(fmt2), index);
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#else
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char fmt2[] = "\tdirection %d hwid %x timestamp %u\n";
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bpf_trace_printk(fmt2, sizeof(fmt2),
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md.u.md2.dir,
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(md.u.md2.hwid_upper << 4) + md.u.md2.hwid,
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bpf_ntohl(md.u.md2.timestamp));
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#endif
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return TC_ACT_OK;
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}
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SEC("ip4ip6erspan_set_tunnel")
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int _ip4ip6erspan_set_tunnel(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key key;
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struct erspan_metadata md;
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int ret;
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__builtin_memset(&key, 0x0, sizeof(key));
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key.remote_ipv6[3] = bpf_htonl(0x11);
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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),
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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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__builtin_memset(&md, 0, sizeof(md));
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#ifdef ERSPAN_V1
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md.u.index = bpf_htonl(123);
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md.version = 1;
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#else
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__u8 direction = 0;
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__u8 hwid = 17;
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md.version = 2;
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md.u.md2.dir = direction;
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md.u.md2.hwid = hwid & 0xf;
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md.u.md2.hwid_upper = (hwid >> 4) & 0x3;
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#endif
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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("ip4ip6erspan_get_tunnel")
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int _ip4ip6erspan_get_tunnel(struct __sk_buff *skb)
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{
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char fmt[] = "ip6erspan get key %d remote ip6 ::%x erspan version %d\n";
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struct bpf_tunnel_key key;
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struct erspan_metadata md;
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__u32 index;
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int ret;
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ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
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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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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.version);
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#ifdef ERSPAN_V1
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char fmt2[] = "\tindex %x\n";
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index = bpf_ntohl(md.u.index);
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bpf_trace_printk(fmt2, sizeof(fmt2), index);
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#else
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char fmt2[] = "\tdirection %d hwid %x timestamp %u\n";
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bpf_trace_printk(fmt2, sizeof(fmt2),
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md.u.md2.dir,
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(md.u.md2.hwid_upper << 4) + md.u.md2.hwid,
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bpf_ntohl(md.u.md2.timestamp));
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#endif
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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),
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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("ip6vxlan_set_tunnel")
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int _ip6vxlan_set_tunnel(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key key;
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int ret;
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__builtin_memset(&key, 0x0, sizeof(key));
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key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
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key.tunnel_id = 22;
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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),
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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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}
|
||
|
|
|
||
|
|
return TC_ACT_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("ip6vxlan_get_tunnel")
|
||
|
|
int _ip6vxlan_get_tunnel(struct __sk_buff *skb)
|
||
|
|
{
|
||
|
|
char fmt[] = "key %d remote ip6 ::%x label %x\n";
|
||
|
|
struct bpf_tunnel_key key;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
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),
|
||
|
|
key.tunnel_id, key.remote_ipv6[3], key.tunnel_label);
|
||
|
|
|
||
|
|
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 = 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) {
|
||
|
|
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("ip6geneve_set_tunnel")
|
||
|
|
int _ip6geneve_set_tunnel(struct __sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct bpf_tunnel_key key;
|
||
|
|
struct geneve_opt 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) {
|
||
|
|
ERROR(ret);
|
||
|
|
return TC_ACT_SHOT;
|
||
|
|
}
|
||
|
|
|
||
|
|
__builtin_memset(&gopt, 0x0, sizeof(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) {
|
||
|
|
ERROR(ret);
|
||
|
|
return TC_ACT_SHOT;
|
||
|
|
}
|
||
|
|
|
||
|
|
return TC_ACT_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("ip6geneve_get_tunnel")
|
||
|
|
int _ip6geneve_get_tunnel(struct __sk_buff *skb)
|
||
|
|
{
|
||
|
|
char fmt[] = "key %d remote ip 0x%x geneve class 0x%x\n";
|
||
|
|
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) {
|
||
|
|
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 == bpf_htons(5200))
|
||
|
|
key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */
|
||
|
|
else if (tcp->dest == bpf_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;
|
||
|
|
}
|
||
|
|
|
||
|
|
__builtin_memset(&key, 0x0, sizeof(key));
|
||
|
|
key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */
|
||
|
|
key.tunnel_ttl = 64;
|
||
|
|
|
||
|
|
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), bpf_htonl(key.remote_ipv6[0]),
|
||
|
|
bpf_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] = bpf_htonl(0x2401db00);
|
||
|
|
key.tunnel_ttl = 64;
|
||
|
|
|
||
|
|
if (iph->nexthdr == 58 /* NEXTHDR_ICMP */) {
|
||
|
|
key.remote_ipv6[3] = bpf_htonl(1);
|
||
|
|
} else {
|
||
|
|
if (iph->nexthdr != 6 /* NEXTHDR_TCP */) {
|
||
|
|
ERROR(iph->nexthdr);
|
||
|
|
return TC_ACT_SHOT;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (tcp->dest == bpf_htons(5200)) {
|
||
|
|
key.remote_ipv6[3] = bpf_htonl(1);
|
||
|
|
} else if (tcp->dest == bpf_htons(5201)) {
|
||
|
|
key.remote_ipv6[3] = bpf_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), bpf_htonl(key.remote_ipv6[0]),
|
||
|
|
bpf_htonl(key.remote_ipv6[3]));
|
||
|
|
return TC_ACT_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
SEC("xfrm_get_state")
|
||
|
|
int _xfrm_get_state(struct __sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct bpf_xfrm_state x;
|
||
|
|
char fmt[] = "reqid %d spi 0x%x remote ip 0x%x\n";
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = bpf_skb_get_xfrm_state(skb, 0, &x, sizeof(x), 0);
|
||
|
|
if (ret < 0)
|
||
|
|
return TC_ACT_OK;
|
||
|
|
|
||
|
|
bpf_trace_printk(fmt, sizeof(fmt), x.reqid, bpf_ntohl(x.spi),
|
||
|
|
bpf_ntohl(x.remote_ipv4));
|
||
|
|
return TC_ACT_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
char _license[] SEC("license") = "GPL";
|