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Date: Fri, 18 Aug 2017 15:09:47 -0400
From: Eric Garver <e@...g.me>
To: Yi Yang <yi.y.yang@...el.com>
Cc: netdev@...r.kernel.org, dev@...nvswitch.org, blp@....org,
jbenc@...hat.com, jan.scheurich@...csson.com
Subject: Re: [PATCH net-next v4] openvswitch: enable NSH support
On Fri, Aug 18, 2017 at 03:24:31PM +0800, Yi Yang wrote:
> v3->v4
> - Add new NSH match field ttl
> - Update NSH header to the latest format
> which will be final format and won't change
> per its author's confirmation.
> - Fix comments for v3.
Hi Yi,
Only a few comments below since Jiri already supplied lots of feedback.
>
> v2->v3
> - Change OVS_KEY_ATTR_NSH to nested key to handle
> length-fixed attributes and length-variable
> attriubte more flexibly.
> - Remove struct ovs_action_push_nsh completely
> - Add code to handle nested attribute for SET_MASKED
> - Change PUSH_NSH to use the nested OVS_KEY_ATTR_NSH
> to transfer NSH header data.
> - Fix comments and coding style issues by Jiri and Eric
>
> v1->v2
> - Change encap_nsh and decap_nsh to push_nsh and pop_nsh
> - Dynamically allocate struct ovs_action_push_nsh for
> length-variable metadata.
>
> OVS master and 2.8 branch has merged NSH userspace
> patch series, this patch is to enable NSH support
> in kernel data path in order that OVS can support
> NSH in 2.8 release in compat mode by porting this.
>
> Signed-off-by: Yi Yang <yi.y.yang@...el.com>
> ---
[..]
> @@ -1210,6 +1373,20 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
> case OVS_ACTION_ATTR_POP_ETH:
> err = pop_eth(skb, key);
> break;
> +
> + case OVS_ACTION_ATTR_PUSH_NSH: {
> + u8 buffer[256];
Use NSH_M_TYPE2_MAX_LEN
> + struct nsh_hdr *nsh_hdr = (struct nsh_hdr *)buffer;
> + const struct nsh_hdr *nsh_src = nsh_hdr;
> +
> + nsh_hdr_from_nlattr(nla_data(a), nsh_hdr);
> + err = push_nsh(skb, key, nsh_src);
> + break;
> + }
> +
> + case OVS_ACTION_ATTR_POP_NSH:
> + err = pop_nsh(skb, key);
> + break;
> }
>
> if (unlikely(err)) {
[..]
> +int nsh_key_from_nlattr(const struct nlattr *attr,
> + struct ovs_key_nsh *nsh)
> +{
> + struct nlattr *a;
> + int rem;
> + bool has_md1 = false;
> + bool has_md2 = false;
> +
> + nla_for_each_nested(a, attr, rem) {
> + int type = nla_type(a);
> +
> + if (type > OVS_NSH_KEY_ATTR_MAX) {
> + OVS_NLERR(1, "nsh attr %d is out of range max %d",
> + type, OVS_NSH_KEY_ATTR_MAX);
> + return -EINVAL;
> + }
> +
> + if (!check_attr_len(nla_len(a),
> + ovs_nsh_key_attr_lens[type].len)) {
> + OVS_NLERR(
> + 1,
> + "nsh attr %d has unexpected len %d expected %d",
> + type,
> + nla_len(a),
> + ovs_nsh_key_attr_lens[type].len
> + );
> + return -EINVAL;
> + }
> +
> + switch (type) {
> + case OVS_NSH_KEY_ATTR_BASE: {
> + const struct ovs_nsh_key_base *base =
> + (struct ovs_nsh_key_base *)nla_data(a);
> +
> + memcpy(nsh, base, sizeof(*base));
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD1: {
> + const struct ovs_nsh_key_md1 *md1 =
> + (struct ovs_nsh_key_md1 *)nla_data(a);
> +
> + has_md1 = true;
> + memcpy(nsh->context, md1->context, sizeof(*md1));
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD2:
> + /* Not supported yet */
return -ENOTPSUPP if it's not supported.
> + has_md2 = true;
> + break;
> + default:
> + OVS_NLERR(1, "Unknown nsh attribute %d",
> + type);
> + return -EINVAL;
> + }
> + }
> +
> + if (rem > 0) {
> + OVS_NLERR(1, "nsh attribute has %d unknown bytes.", rem);
> + return -EINVAL;
> + }
> +
> + if ((has_md1 && nsh->mdtype != NSH_M_TYPE1) ||
> + (has_md2 && nsh->mdtype != NSH_M_TYPE2)) {
> + OVS_NLERR(1, "nsh attribute has unmatched MD type %d.",
> + nsh->mdtype);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int nsh_key_put_from_nlattr(const struct nlattr *attr,
> + struct sw_flow_match *match, bool is_mask,
> + bool log)
> +{
> + struct nlattr *a;
> + int rem;
> + bool has_md1 = false;
> + bool has_md2 = false;
> + u8 mdtype = 0;
> +
> + nla_for_each_nested(a, attr, rem) {
> + int type = nla_type(a);
> + int i;
> +
> + if (type > OVS_NSH_KEY_ATTR_MAX) {
> + OVS_NLERR(log, "nsh attr %d is out of range max %d",
> + type, OVS_NSH_KEY_ATTR_MAX);
> + return -EINVAL;
> + }
> +
> + if (!check_attr_len(nla_len(a),
> + ovs_nsh_key_attr_lens[type].len)) {
> + OVS_NLERR(
> + log,
> + "nsh attr %d has unexpected len %d expected %d",
> + type,
> + nla_len(a),
> + ovs_nsh_key_attr_lens[type].len
> + );
> + return -EINVAL;
> + }
> +
> + switch (type) {
> + case OVS_NSH_KEY_ATTR_BASE: {
> + const struct ovs_nsh_key_base *base =
> + (struct ovs_nsh_key_base *)nla_data(a);
> +
> + mdtype = base->mdtype;
> + SW_FLOW_KEY_PUT(match, nsh.flags,
> + base->flags, is_mask);
> + SW_FLOW_KEY_PUT(match, nsh.ttl,
> + base->ttl, is_mask);
> + SW_FLOW_KEY_PUT(match, nsh.mdtype,
> + base->mdtype, is_mask);
> + SW_FLOW_KEY_PUT(match, nsh.np,
> + base->np, is_mask);
> + SW_FLOW_KEY_PUT(match, nsh.path_hdr,
> + base->path_hdr, is_mask);
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD1: {
> + const struct ovs_nsh_key_md1 *md1 =
> + (struct ovs_nsh_key_md1 *)nla_data(a);
> +
> + has_md1 = true;
> + for (i = 0; i < NSH_MD1_CONTEXT_SIZE; i++)
> + SW_FLOW_KEY_PUT(match, nsh.context[i],
> + md1->context[i], is_mask);
> + break;
> + }
> + case OVS_NSH_KEY_ATTR_MD2:
> + /* Not supported yet */
return -ENOTPSUPP if it's not supported.
> + has_md2 = true;
> + break;
> + default:
> + OVS_NLERR(log, "Unknown nsh attribute %d",
> + type);
> + return -EINVAL;
> + }
> + }
> +
> + if (rem > 0) {
> + OVS_NLERR(log, "nsh attribute has %d unknown bytes.", rem);
> + return -EINVAL;
> + }
> +
> + if (!is_mask) {
> + if ((has_md1 && mdtype != NSH_M_TYPE1) ||
> + (has_md2 && mdtype != NSH_M_TYPE2)) {
> + OVS_NLERR(1, "nsh attribute has unmatched MD type %d.",
> + mdtype);
> + return -EINVAL;
> + }
> + }
> +
> + return 0;
> +}
> +
[..]
> @@ -2636,6 +2984,17 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
> mac_proto = MAC_PROTO_ETHERNET;
> break;
>
> + case OVS_ACTION_ATTR_PUSH_NSH:
You need to some validation here, especially the metadata lengths.
Relying on action_lens is not enough because it's variable.
> + mac_proto = MAC_PROTO_NONE;
> + break;
> +
> + case OVS_ACTION_ATTR_POP_NSH:
> + if (key->nsh.np == NSH_P_ETHERNET)
> + mac_proto = MAC_PROTO_ETHERNET;
> + else
> + mac_proto = MAC_PROTO_NONE;
> + break;
> +
> default:
> OVS_NLERR(log, "Unknown Action type %d", type);
> return -EINVAL;
[..]
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