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net: erspan: fix metadata extraction 

Commit d350a82302 ("net: erspan: create erspan metadata uapi header")
moves the erspan 'version' in front of the 'struct erspan_md2' for
later extensibility reason.  This breaks the existing erspan metadata
extraction code because the erspan_md2 then has a 4-byte offset
to between the erspan_metadata and erspan_base_hdr.  This patch
fixes it.

Fixes: 1a66a836da ("gre: add collect_md mode to ERSPAN tunnel")
Fixes: ef7baf5e08 ("ip6_gre: add ip6 erspan collect_md mode")
Fixes: 1d7e2ed22f ("net: erspan: refactor existing erspan code")
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 13:35:34 -08:00 committed by David S. Miller
parent d7cdee5ea8
commit 3df1928302
3 changed files with 21 additions and 16 deletions
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26
include/net/erspan.h
View File

@ -159,13 +159,13 @@ static inline void erspan_build_header(struct sk_buff *skb,
struct ethhdr *eth = (struct ethhdr *)skb->data;
enum erspan_encap_type enc_type;
struct erspan_base_hdr *ershdr;
struct erspan_metadata *ersmd;
struct qtag_prefix {
__be16 eth_type;
__be16 tci;
} *qp;
u16 vlan_tci = 0;
u8 tos;
__be32 *idx;
tos = is_ipv4 ? ip_hdr(skb)->tos :
(ipv6_hdr(skb)->priority << 4) +
@ -195,8 +195,8 @@ static inline void erspan_build_header(struct sk_buff *skb,
set_session_id(ershdr, id);
/* Build metadata */
ersmd = (struct erspan_metadata *)(ershdr + 1);
ersmd->u.index = htonl(index & INDEX_MASK);
idx = (__be32 *)(ershdr + 1);
*idx = htonl(index & INDEX_MASK);
}
/* ERSPAN GRA: timestamp granularity
@ -225,7 +225,7 @@ static inline void erspan_build_header_v2(struct sk_buff *skb,
{
struct ethhdr *eth = (struct ethhdr *)skb->data;
struct erspan_base_hdr *ershdr;
struct erspan_metadata *md;
struct erspan_md2 *md2;
struct qtag_prefix {
__be16 eth_type;
__be16 tci;
@ -261,15 +261,15 @@ static inline void erspan_build_header_v2(struct sk_buff *skb,
set_session_id(ershdr, id);
/* Build metadata */
md = (struct erspan_metadata *)(ershdr + 1);
md->u.md2.timestamp = erspan_get_timestamp();
md->u.md2.sgt = htons(sgt);
md->u.md2.p = 1;
md->u.md2.ft = 0;
md->u.md2.dir = direction;
md->u.md2.gra = gra;
md->u.md2.o = 0;
set_hwid(&md->u.md2, hwid);
md2 = (struct erspan_md2 *)(ershdr + 1);
md2->timestamp = erspan_get_timestamp();
md2->sgt = htons(sgt);
md2->p = 1;
md2->ft = 0;
md2->dir = direction;
md2->gra = gra;
md2->o = 0;
set_hwid(md2, hwid);
}
#endif

5
net/ipv4/ip_gre.c
View File

@ -261,6 +261,7 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
struct ip_tunnel_net *itn;
struct ip_tunnel *tunnel;
const struct iphdr *iph;
struct erspan_md2 *md2;
int ver;
int len;
@ -313,8 +314,10 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
return PACKET_REJECT;
md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
memcpy(md, pkt_md, sizeof(*md));
md->version = ver;
md2 = &md->u.md2;
memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
ERSPAN_V2_MDSIZE);
info = &tun_dst->u.tun_info;
info->key.tun_flags |= TUNNEL_ERSPAN_OPT;

6
net/ipv6/ip6_gre.c
View File

@ -505,6 +505,7 @@ static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
struct erspan_base_hdr *ershdr;
struct erspan_metadata *pkt_md;
const struct ipv6hdr *ipv6h;
struct erspan_md2 *md2;
struct ip6_tnl *tunnel;
u8 ver;
@ -551,9 +552,10 @@ static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
info = &tun_dst->u.tun_info;
md = ip_tunnel_info_opts(info);
memcpy(md, pkt_md, sizeof(*md));
md->version = ver;
md2 = &md->u.md2;
memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
ERSPAN_V2_MDSIZE);
info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
info->options_len = sizeof(*md);