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samples/bpf: add erspan v2 sample code

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Extend the existing tests for ipv4 ipv6 erspan version 2.

Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu
2017-12-13 16:38:58 -08:00
committed by David S. Miller
parent 94d7d8f292
commit ac80c2a165
2 changed files with 96 additions and 19 deletions
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77
samples/bpf/tcbpf2_kern.c
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@@ -35,12 +35,22 @@ 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 {
__be32 index;
union {
__be32 index;
struct erspan_md2 md2;
} u;
int version;
};
SEC("gre_set_tunnel")
@@ -143,7 +153,18 @@ int _erspan_set_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}
md.index = htonl(123);
__builtin_memset(&md, 0, sizeof(md));
#ifdef ERSPAN_V1
md.version = 1;
md.u.index = htonl(123);
#else
u8 direction = 1;
u16 hwid = 7;
md.version = 2;
md.u.md2.flags = htons((direction << 3) | (hwid << 4));
#endif
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
ERROR(ret);
@@ -156,7 +177,7 @@ int _erspan_set_tunnel(struct __sk_buff *skb)
SEC("erspan_get_tunnel")
int _erspan_get_tunnel(struct __sk_buff *skb)
{
char fmt[] = "key %d remote ip 0x%x erspan index 0x%x\n";
char fmt[] = "key %d remote ip 0x%x erspan version %d\n";
struct bpf_tunnel_key key;
struct erspan_metadata md;
u32 index;
@@ -174,9 +195,22 @@ int _erspan_get_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}
index = bpf_ntohl(md.index);
bpf_trace_printk(fmt, sizeof(fmt),
key.tunnel_id, key.remote_ipv4, index);
key.tunnel_id, key.remote_ipv4, md.version);
#ifdef ERSPAN_V1
char fmt2[] = "\tindex %x\n";
index = bpf_ntohl(md.u.index);
bpf_trace_printk(fmt2, sizeof(fmt2), index);
#else
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,
bpf_ntohl(md.u.md2.timestamp));
#endif
return TC_ACT_OK;
}
@@ -201,7 +235,19 @@ int _ip4ip6erspan_set_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}
md.index = htonl(123);
__builtin_memset(&md, 0, sizeof(md));
#ifdef ERSPAN_V1
md.u.index = htonl(123);
md.version = 1;
#else
u8 direction = 0;
u16 hwid = 17;
md.version = 2;
md.u.md2.flags = htons((direction << 3) | (hwid << 4));
#endif
ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md));
if (ret < 0) {
ERROR(ret);
@@ -214,7 +260,7 @@ int _ip4ip6erspan_set_tunnel(struct __sk_buff *skb)
SEC("ip4ip6erspan_get_tunnel")
int _ip4ip6erspan_get_tunnel(struct __sk_buff *skb)
{
char fmt[] = "key %d remote ip6 ::%x erspan index 0x%x\n";
char fmt[] = "ip6erspan get key %d remote ip6 ::%x erspan version %d\n";
struct bpf_tunnel_key key;
struct erspan_metadata md;
u32 index;
@@ -232,9 +278,22 @@ int _ip4ip6erspan_get_tunnel(struct __sk_buff *skb)
return TC_ACT_SHOT;
}
index = bpf_ntohl(md.index);
bpf_trace_printk(fmt, sizeof(fmt),
key.tunnel_id, key.remote_ipv6[0], index);
key.tunnel_id, key.remote_ipv4, md.version);
#ifdef ERSPAN_V1
char fmt2[] = "\tindex %x\n";
index = bpf_ntohl(md.u.index);
bpf_trace_printk(fmt2, sizeof(fmt2), index);
#else
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,
bpf_ntohl(md.u.md2.timestamp));
#endif
return TC_ACT_OK;
}