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samples/bpf: Add tunnel set/get tests.
The patch creates sample code exercising bpf_skb_{set,get}_tunnel_key,
and bpf_skb_{set,get}_tunnel_opt for GRE, VXLAN, and GENEVE. A native
tunnel device is created in a namespace to interact with a lwtunnel
device out of the namespace, with metadata enabled. The bpf_skb_set_*
program is attached to tc egress and bpf_skb_get_* is attached to egress
qdisc. A ping between two tunnels is used to verify correctness and
the result of bpf_skb_get_* printed by bpf_trace_printk.
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu
David S. Miller
parent
c0b558e5a3
commit
6afb1e28b8
@ -67,6 +67,7 @@ always += tracex6_kern.o
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always += test_probe_write_user_kern.o
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always += trace_output_kern.o
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always += tcbpf1_kern.o
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always += tcbpf2_kern.o
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always += lathist_kern.o
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always += offwaketime_kern.o
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always += spintest_kern.o
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@ -47,6 +47,14 @@ static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
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(void *) BPF_FUNC_probe_write_user;
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static int (*bpf_current_task_under_cgroup)(void *map, int index) =
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(void *) BPF_FUNC_current_task_under_cgroup;
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static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
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(void *) BPF_FUNC_skb_get_tunnel_key;
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static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
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(void *) BPF_FUNC_skb_set_tunnel_key;
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static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
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(void *) BPF_FUNC_skb_get_tunnel_opt;
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static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
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(void *) BPF_FUNC_skb_set_tunnel_opt;
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/* llvm builtin functions that eBPF C program may use to
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* emit BPF_LD_ABS and BPF_LD_IND instructions
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191
samples/bpf/tcbpf2_kern.c
Normal file
191
samples/bpf/tcbpf2_kern.c
Normal file
@ -0,0 +1,191 @@
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/* Copyright (c) 2016 VMware
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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 <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/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 "bpf_helpers.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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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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char _license[] SEC("license") = "GPL";
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127
samples/bpf/test_tunnel_bpf.sh
Executable file
127
samples/bpf/test_tunnel_bpf.sh
Executable file
@ -0,0 +1,127 @@
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#!/bin/bash
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# In Namespace 0 (at_ns0) using native tunnel
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# Overlay IP: 10.1.1.100
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# local 192.16.1.100 remote 192.16.1.200
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# veth0 IP: 172.16.1.100, tunnel dev <type>00
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# Out of Namespace using BPF set/get on lwtunnel
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# Overlay IP: 10.1.1.200
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# local 172.16.1.200 remote 172.16.1.100
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# veth1 IP: 172.16.1.200, tunnel dev <type>11
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set -e
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function config_device {
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ip netns add at_ns0
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ip link add veth0 type veth peer name veth1
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ip link set veth0 netns at_ns0
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ip netns exec at_ns0 ip addr add 172.16.1.100/24 dev veth0
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ip netns exec at_ns0 ip link set dev veth0 up
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ip link set dev veth1 up
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ip addr add dev veth1 172.16.1.200/24
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}
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function add_gre_tunnel {
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# in namespace
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ip netns exec at_ns0 \
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ip link add dev $DEV_NS type $TYPE key 2 local 172.16.1.100 remote 172.16.1.200
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ip netns exec at_ns0 ip link set dev $DEV_NS up
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ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
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# out of namespace
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ip link add dev $DEV type $TYPE key 2 external
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ip link set dev $DEV up
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ip addr add dev $DEV 10.1.1.200/24
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}
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function add_vxlan_tunnel {
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# Set static ARP entry here because iptables set-mark works
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# on L3 packet, as a result not applying to ARP packets,
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# causing errors at get_tunnel_{key/opt}.
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# in namespace
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ip netns exec at_ns0 \
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ip link add dev $DEV_NS type $TYPE id 2 dstport 4789 gbp remote 172.16.1.200
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ip netns exec at_ns0 ip link set dev $DEV_NS address 52:54:00:d9:01:00 up
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ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
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ip netns exec at_ns0 arp -s 10.1.1.200 52:54:00:d9:02:00
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ip netns exec at_ns0 iptables -A OUTPUT -j MARK --set-mark 0x800FF
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# out of namespace
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ip link add dev $DEV type $TYPE external gbp dstport 4789
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ip link set dev $DEV address 52:54:00:d9:02:00 up
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ip addr add dev $DEV 10.1.1.200/24
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arp -s 10.1.1.100 52:54:00:d9:01:00
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}
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function add_geneve_tunnel {
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# in namespace
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ip netns exec at_ns0 \
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ip link add dev $DEV_NS type $TYPE id 2 dstport 6081 remote 172.16.1.200
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ip netns exec at_ns0 ip link set dev $DEV_NS up
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ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
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# out of namespace
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ip link add dev $DEV type $TYPE dstport 6081 external
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ip link set dev $DEV up
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ip addr add dev $DEV 10.1.1.200/24
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}
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function attach_bpf {
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DEV=$1
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SET_TUNNEL=$2
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GET_TUNNEL=$3
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tc qdisc add dev $DEV clsact
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tc filter add dev $DEV egress bpf da obj tcbpf2_kern.o sec $SET_TUNNEL
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tc filter add dev $DEV ingress bpf da obj tcbpf2_kern.o sec $GET_TUNNEL
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}
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function test_gre {
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TYPE=gretap
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DEV_NS=gretap00
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DEV=gretap11
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config_device
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add_gre_tunnel
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attach_bpf $DEV gre_set_tunnel gre_get_tunnel
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ping -c 1 10.1.1.100
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ip netns exec at_ns0 ping -c 1 10.1.1.200
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}
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function test_vxlan {
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TYPE=vxlan
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DEV_NS=vxlan00
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DEV=vxlan11
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config_device
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add_vxlan_tunnel
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attach_bpf $DEV vxlan_set_tunnel vxlan_get_tunnel
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ping -c 1 10.1.1.100
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ip netns exec at_ns0 ping -c 1 10.1.1.200
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}
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function test_geneve {
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TYPE=geneve
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DEV_NS=geneve00
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DEV=geneve11
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config_device
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add_geneve_tunnel
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attach_bpf $DEV geneve_set_tunnel geneve_get_tunnel
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ping -c 1 10.1.1.100
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ip netns exec at_ns0 ping -c 1 10.1.1.200
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}
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function cleanup {
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ip netns delete at_ns0
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ip link del veth1
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ip link del $DEV
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}
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echo "Testing GRE tunnel..."
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test_gre
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cleanup
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echo "Testing VXLAN tunnel..."
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test_vxlan
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cleanup
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echo "Testing GENEVE tunnel..."
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test_geneve
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cleanup
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echo "Success"
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