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lwtunnel: get nlsize for erspan options properly 

erspan v1 has OPT_ERSPAN_INDEX while erspan v2 has OPT_ERSPAN_DIR and
OPT_ERSPAN_HWID attributes, and they require different nlsize when
dumping.

So this patch is to get nlsize for erspan options properly according
to erspan version.

Fixes: b0a21810bd ("lwtunnel: add options setting and dumping for erspan")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2019-11-10 12:21:18 +08:00 committed by David S. Miller
parent ed02551f58
commit 58e8494eb0
1 changed files with 7 additions and 1 deletions
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8
net/ipv4/ip_tunnel_core.c
View File

@ -613,9 +613,15 @@ static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */
+ nla_total_size(4); /* OPT_VXLAN_GBP */
} else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
struct erspan_metadata *md = ip_tunnel_info_opts(info);
opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */
+ nla_total_size(1) /* OPT_ERSPAN_VER */
+ nla_total_size(4); /* OPT_ERSPAN_INDEX/DIR/HWID */
+ (md->version == 1 ? nla_total_size(4)
/* OPT_ERSPAN_INDEX (v1) */
: nla_total_size(1) +
nla_total_size(1));
/* OPT_ERSPAN_DIR + HWID (v2) */
}
return opt_len;