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sample/bpf: fix erspan metadata 

The commit c69de58ba8 ("net: erspan: use bitfield instead of
mask and offset") changes the erspan header to use bitfield, and
commit d350a82302 ("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: ac80c2a165 ("samples/bpf: add erspan v2 sample code")
Fixes: ef88f89c83 ("samples/bpf: extend test_tunnel_bpf.sh with ERSPAN")
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu 2018-02-05 13:35:36 -08:00 committed by David S. Miller
parent 39f57f6799
commit 9c33ca4317
2 changed files with 18 additions and 27 deletions
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37
samples/bpf/tcbpf2_kern.c
View File

@ -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

4
samples/bpf/test_tunnel_bpf.sh
View File

@ -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