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openvswitch: add erspan version I and II support

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The patch adds support for openvswitch to configure erspan
v1 and v2.  The OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS attr is added
to uapi as a binary blob to support all ERSPAN v1 and v2's
fields.  Note that Previous commit "openvswitch: Add erspan tunnel
support." was reverted since it does not design properly.

Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu 2018-01-25 13:20:11 -08:00 committed by David S. Miller
parent d350a82302
commit fc1372f89f
2 changed files with 52 additions and 1 deletions
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1
include/uapi/linux/openvswitch.h
View File

@ -363,6 +363,7 @@ enum ovs_tunnel_key_attr {
OVS_TUNNEL_KEY_ATTR_IPV6_SRC, /* struct in6_addr src IPv6 address. */
OVS_TUNNEL_KEY_ATTR_IPV6_DST, /* struct in6_addr dst IPv6 address. */
OVS_TUNNEL_KEY_ATTR_PAD,
OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS, /* struct erspan_metadata */
__OVS_TUNNEL_KEY_ATTR_MAX
};

52
net/openvswitch/flow_netlink.c
View File

@ -49,6 +49,7 @@
#include <net/mpls.h>
#include <net/vxlan.h>
#include <net/tun_proto.h>
#include <net/erspan.h>
#include "flow_netlink.h"
@ -329,7 +330,8 @@ size_t ovs_tun_key_attr_size(void)
+ nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
+ nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_OAM */
+ nla_total_size(256) /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
/* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS is mutually exclusive with
/* OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS and
* OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS is mutually exclusive with
* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS and covered by it.
*/
+ nla_total_size(2) /* OVS_TUNNEL_KEY_ATTR_TP_SRC */
@ -400,6 +402,7 @@ static const struct ovs_len_tbl ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1]
.next = ovs_vxlan_ext_key_lens },
[OVS_TUNNEL_KEY_ATTR_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
[OVS_TUNNEL_KEY_ATTR_IPV6_DST] = { .len = sizeof(struct in6_addr) },
[OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS] = { .len = OVS_ATTR_VARIABLE },
};
static const struct ovs_len_tbl
@ -631,6 +634,33 @@ static int vxlan_tun_opt_from_nlattr(const struct nlattr *attr,
return 0;
}
static int erspan_tun_opt_from_nlattr(const struct nlattr *a,
struct sw_flow_match *match, bool is_mask,
bool log)
{
unsigned long opt_key_offset;
BUILD_BUG_ON(sizeof(struct erspan_metadata) >
sizeof(match->key->tun_opts));
if (nla_len(a) > sizeof(match->key->tun_opts)) {
OVS_NLERR(log, "ERSPAN option length err (len %d, max %zu).",
nla_len(a), sizeof(match->key->tun_opts));
return -EINVAL;
}
if (!is_mask)
SW_FLOW_KEY_PUT(match, tun_opts_len,
sizeof(struct erspan_metadata), false);
else
SW_FLOW_KEY_PUT(match, tun_opts_len, 0xff, true);
opt_key_offset = TUN_METADATA_OFFSET(nla_len(a));
SW_FLOW_KEY_MEMCPY_OFFSET(match, opt_key_offset, nla_data(a),
nla_len(a), is_mask);
return 0;
}
static int ip_tun_from_nlattr(const struct nlattr *attr,
struct sw_flow_match *match, bool is_mask,
bool log)
@ -738,6 +768,20 @@ static int ip_tun_from_nlattr(const struct nlattr *attr,
break;
case OVS_TUNNEL_KEY_ATTR_PAD:
break;
case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
if (opts_type) {
OVS_NLERR(log, "Multiple metadata blocks provided");
return -EINVAL;
}
err = erspan_tun_opt_from_nlattr(a, match, is_mask,
log);
if (err)
return err;
tun_flags |= TUNNEL_ERSPAN_OPT;
opts_type = type;
break;
default:
OVS_NLERR(log, "Unknown IP tunnel attribute %d",
type);
@ -862,6 +906,10 @@ static int __ip_tun_to_nlattr(struct sk_buff *skb,
else if (output->tun_flags & TUNNEL_VXLAN_OPT &&
vxlan_opt_to_nlattr(skb, tun_opts, swkey_tun_opts_len))
return -EMSGSIZE;
else if (output->tun_flags & TUNNEL_ERSPAN_OPT &&
nla_put(skb, OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,
swkey_tun_opts_len, tun_opts))
return -EMSGSIZE;
}
return 0;
@ -2486,6 +2534,8 @@ static int validate_and_copy_set_tun(const struct nlattr *attr,
break;
case OVS_TUNNEL_KEY_ATTR_VXLAN_OPTS:
break;
case OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS:
break;
}
}