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Commit 9c33ca43 authored by William Tu's avatar William Tu Committed by David S. Miller
Browse files

sample/bpf: fix erspan metadata 



The commit c69de58b ("net: erspan: use bitfield instead of
mask and offset") changes the erspan header to use bitfield, and
commit d350a823 ("net: erspan: create erspan metadata uapi header")
creates a uapi header file.  The above two commit breaks the current
erspan test.  This patch fixes it by adapting the above two changes.

Fixes: ac80c2a1 ("samples/bpf: add erspan v2 sample code")
Fixes: ef88f89c ("samples/bpf: extend test_tunnel_bpf.sh with ERSPAN")
Signed-off-by: default avatarWilliam Tu <u9012063@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 39f57f67

samples/bpf/tcbpf2_kern.c

+16 −25
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <uapi/linux/tcp.h>

#include <uapi/linux/filter.h>

#include <uapi/linux/pkt_cls.h>

#include <uapi/linux/erspan.h>

#include <net/ipv6.h>

#include "bpf_helpers.h"

#include "bpf_endian.h"
@@ -35,24 +36,10 @@ struct geneve_opt { 
	u8	opt_data[8]; /* hard-coded to 8 byte */

};



struct erspan_md2 {

	__be32 timestamp;

	__be16 sgt;

	__be16 flags;

};



struct vxlan_metadata {

	u32     gbp;

};



struct erspan_metadata {

	union {

		__be32 index;

		struct erspan_md2 md2;

	} u;

	int version;

};



SEC("gre_set_tunnel")

int _gre_set_tunnel(struct __sk_buff *skb)

{
@@ -156,13 +143,15 @@ int _erspan_set_tunnel(struct __sk_buff *skb) 
	__builtin_memset(&md, 0, sizeof(md));

#ifdef ERSPAN_V1

	md.version = 1;

	md.u.index = htonl(123);

	md.u.index = bpf_htonl(123);

#else

	u8 direction = 1;

	u16 hwid = 7;

	u8 hwid = 7;



	md.version = 2;

	md.u.md2.flags = htons((direction << 3) | (hwid << 4));

	md.u.md2.dir = direction;

	md.u.md2.hwid = hwid & 0xf;

	md.u.md2.hwid_upper = (hwid >> 4) & 0x3;

#endif



	ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
@@ -207,8 +196,8 @@ int _erspan_get_tunnel(struct __sk_buff *skb) 
	char fmt2[] = "\tdirection %d hwid %x timestamp %u\n";



	bpf_trace_printk(fmt2, sizeof(fmt2),

		(ntohs(md.u.md2.flags) >> 3) & 0x1,

		(ntohs(md.u.md2.flags) >> 4) & 0x3f,

			 md.u.md2.dir,

			 (md.u.md2.hwid_upper << 4) + md.u.md2.hwid,

			 bpf_ntohl(md.u.md2.timestamp));

#endif
@@ -242,10 +231,12 @@ int _ip4ip6erspan_set_tunnel(struct __sk_buff *skb) 
	md.version = 1;

#else

	u8 direction = 0;

	u16 hwid = 17;

	u8 hwid = 17;



	md.version = 2;

	md.u.md2.flags = htons((direction << 3) | (hwid << 4));

	md.u.md2.dir = direction;

	md.u.md2.hwid = hwid & 0xf;

	md.u.md2.hwid_upper = (hwid >> 4) & 0x3;

#endif



	ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
@@ -290,8 +281,8 @@ int _ip4ip6erspan_get_tunnel(struct __sk_buff *skb) 
	char fmt2[] = "\tdirection %d hwid %x timestamp %u\n";



	bpf_trace_printk(fmt2, sizeof(fmt2),

		(ntohs(md.u.md2.flags) >> 3) & 0x1,

		(ntohs(md.u.md2.flags) >> 4) & 0x3f,

			 md.u.md2.dir,

			 (md.u.md2.hwid_upper << 4) + md.u.md2.hwid,

			 bpf_ntohl(md.u.md2.timestamp));

#endif

samples/bpf/test_tunnel_bpf.sh

+2 −2
Original line number Diff line number Diff line
@@ -68,7 +68,7 @@ function add_erspan_tunnel { 
		ip netns exec at_ns0 \

		ip link add dev $DEV_NS type $TYPE seq key 2 \

		local 172.16.1.100 remote 172.16.1.200 \

		erspan_ver 2 erspan_dir 1 erspan_hwid 3

		erspan_ver 2 erspan_dir egress erspan_hwid 3

	fi

	ip netns exec at_ns0 ip link set dev $DEV_NS up

	ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24
@@ -97,7 +97,7 @@ function add_ip6erspan_tunnel { 
		ip netns exec at_ns0 \

		ip link add dev $DEV_NS type $TYPE seq key 2 \

		local ::11 remote ::22 \

		erspan_ver 2 erspan_dir 1 erspan_hwid 7

		erspan_ver 2 erspan_dir egress erspan_hwid 7

	fi

	ip netns exec at_ns0 ip addr add dev $DEV_NS 10.1.1.100/24

	ip netns exec at_ns0 ip link set dev $DEV_NS up