ipv6: ioam: IOAM Generic Netlink API

Add Generic Netlink commands to allow userspace to configure IOAM
namespaces and schemas. The target is iproute2 and the patch is ready.
It will be posted as soon as this patchset is merged. Here is an overview:

$ ip ioam
Usage:	ip ioam { COMMAND | help }
	ip ioam namespace show
	ip ioam namespace add ID [ data DATA32 ] [ wide DATA64 ]
	ip ioam namespace del ID
	ip ioam schema show
	ip ioam schema add ID DATA
	ip ioam schema del ID
	ip ioam namespace set ID schema { ID | none }

Signed-off-by: Justin Iurman <justin.iurman@uliege.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 559 insertions, 2 deletions

diff --git a/net/ipv6/ioam6.c b/net/ipv6/ioam6.c
index ba629e1b9408..ba59671f32b8 100644
--- a/net/ipv6/ioam6.c
+++ b/net/ipv6/ioam6.c
@@ -11,9 +11,11 @@
 #include <linux/kernel.h>
 #include <linux/net.h>
 #include <linux/ioam6.h>
+#include <linux/ioam6_genl.h>
 #include <linux/rhashtable.h>
 
 #include <net/addrconf.h>
+#include <net/genetlink.h>
 #include <net/ioam6.h>
 
 static void ioam6_ns_release(struct ioam6_namespace *ns)
@@ -72,6 +74,552 @@ static const struct rhashtable_params rht_sc_params = {
 	.obj_cmpfn		= ioam6_sc_cmpfn,
 };
 
+static struct genl_family ioam6_genl_family;
+
+static const struct nla_policy ioam6_genl_policy_addns[] = {
+	[IOAM6_ATTR_NS_ID]	= { .type = NLA_U16 },
+	[IOAM6_ATTR_NS_DATA]	= { .type = NLA_U32 },
+	[IOAM6_ATTR_NS_DATA_WIDE] = { .type = NLA_U64 },
+};
+
+static const struct nla_policy ioam6_genl_policy_delns[] = {
+	[IOAM6_ATTR_NS_ID]	= { .type = NLA_U16 },
+};
+
+static const struct nla_policy ioam6_genl_policy_addsc[] = {
+	[IOAM6_ATTR_SC_ID]	= { .type = NLA_U32 },
+	[IOAM6_ATTR_SC_DATA]	= { .type = NLA_BINARY,
+				    .len = IOAM6_MAX_SCHEMA_DATA_LEN },
+};
+
+static const struct nla_policy ioam6_genl_policy_delsc[] = {
+	[IOAM6_ATTR_SC_ID]	= { .type = NLA_U32 },
+};
+
+static const struct nla_policy ioam6_genl_policy_ns_sc[] = {
+	[IOAM6_ATTR_NS_ID]	= { .type = NLA_U16 },
+	[IOAM6_ATTR_SC_ID]	= { .type = NLA_U32 },
+	[IOAM6_ATTR_SC_NONE]	= { .type = NLA_FLAG },
+};
+
+static int ioam6_genl_addns(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	struct ioam6_namespace *ns;
+	u64 data64;
+	u32 data32;
+	__be16 id;
+	int err;
+
+	if (!info->attrs[IOAM6_ATTR_NS_ID])
+		return -EINVAL;
+
+	id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	ns = rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
+	if (ns) {
+		err = -EEXIST;
+		goto out_unlock;
+	}
+
+	ns = kzalloc(sizeof(*ns), GFP_KERNEL);
+	if (!ns) {
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	ns->id = id;
+
+	if (!info->attrs[IOAM6_ATTR_NS_DATA])
+		data32 = IOAM6_U32_UNAVAILABLE;
+	else
+		data32 = nla_get_u32(info->attrs[IOAM6_ATTR_NS_DATA]);
+
+	if (!info->attrs[IOAM6_ATTR_NS_DATA_WIDE])
+		data64 = IOAM6_U64_UNAVAILABLE;
+	else
+		data64 = nla_get_u64(info->attrs[IOAM6_ATTR_NS_DATA_WIDE]);
+
+	ns->data = cpu_to_be32(data32);
+	ns->data_wide = cpu_to_be64(data64);
+
+	err = rhashtable_lookup_insert_fast(&nsdata->namespaces, &ns->head,
+					    rht_ns_params);
+	if (err)
+		kfree(ns);
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static int ioam6_genl_delns(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	struct ioam6_namespace *ns;
+	struct ioam6_schema *sc;
+	__be16 id;
+	int err;
+
+	if (!info->attrs[IOAM6_ATTR_NS_ID])
+		return -EINVAL;
+
+	id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	ns = rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
+	if (!ns) {
+		err = -ENOENT;
+		goto out_unlock;
+	}
+
+	sc = rcu_dereference_protected(ns->schema,
+				       lockdep_is_held(&nsdata->lock));
+
+	err = rhashtable_remove_fast(&nsdata->namespaces, &ns->head,
+				     rht_ns_params);
+	if (err)
+		goto out_unlock;
+
+	if (sc)
+		rcu_assign_pointer(sc->ns, NULL);
+
+	ioam6_ns_release(ns);
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static int __ioam6_genl_dumpns_element(struct ioam6_namespace *ns,
+				       u32 portid,
+				       u32 seq,
+				       u32 flags,
+				       struct sk_buff *skb,
+				       u8 cmd)
+{
+	struct ioam6_schema *sc;
+	u64 data64;
+	u32 data32;
+	void *hdr;
+
+	hdr = genlmsg_put(skb, portid, seq, &ioam6_genl_family, flags, cmd);
+	if (!hdr)
+		return -ENOMEM;
+
+	data32 = be32_to_cpu(ns->data);
+	data64 = be64_to_cpu(ns->data_wide);
+
+	if (nla_put_u16(skb, IOAM6_ATTR_NS_ID, be16_to_cpu(ns->id)) ||
+	    (data32 != IOAM6_U32_UNAVAILABLE &&
+	     nla_put_u32(skb, IOAM6_ATTR_NS_DATA, data32)) ||
+	    (data64 != IOAM6_U64_UNAVAILABLE &&
+	     nla_put_u64_64bit(skb, IOAM6_ATTR_NS_DATA_WIDE,
+			       data64, IOAM6_ATTR_PAD)))
+		goto nla_put_failure;
+
+	rcu_read_lock();
+
+	sc = rcu_dereference(ns->schema);
+	if (sc && nla_put_u32(skb, IOAM6_ATTR_SC_ID, sc->id)) {
+		rcu_read_unlock();
+		goto nla_put_failure;
+	}
+
+	rcu_read_unlock();
+
+	genlmsg_end(skb, hdr);
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(skb, hdr);
+	return -EMSGSIZE;
+}
+
+static int ioam6_genl_dumpns_start(struct netlink_callback *cb)
+{
+	struct ioam6_pernet_data *nsdata = ioam6_pernet(sock_net(cb->skb->sk));
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	if (!iter) {
+		iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+		if (!iter)
+			return -ENOMEM;
+
+		cb->args[0] = (long)iter;
+	}
+
+	rhashtable_walk_enter(&nsdata->namespaces, iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpns_done(struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	rhashtable_walk_exit(iter);
+	kfree(iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpns(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter;
+	struct ioam6_namespace *ns;
+	int err;
+
+	iter = (struct rhashtable_iter *)cb->args[0];
+	rhashtable_walk_start(iter);
+
+	for (;;) {
+		ns = rhashtable_walk_next(iter);
+
+		if (IS_ERR(ns)) {
+			if (PTR_ERR(ns) == -EAGAIN)
+				continue;
+			err = PTR_ERR(ns);
+			goto done;
+		} else if (!ns) {
+			break;
+		}
+
+		err = __ioam6_genl_dumpns_element(ns,
+						  NETLINK_CB(cb->skb).portid,
+						  cb->nlh->nlmsg_seq,
+						  NLM_F_MULTI,
+						  skb,
+						  IOAM6_CMD_DUMP_NAMESPACES);
+		if (err)
+			goto done;
+	}
+
+	err = skb->len;
+
+done:
+	rhashtable_walk_stop(iter);
+	return err;
+}
+
+static int ioam6_genl_addsc(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	int len, len_aligned, err;
+	struct ioam6_schema *sc;
+	u32 id;
+
+	if (!info->attrs[IOAM6_ATTR_SC_ID] || !info->attrs[IOAM6_ATTR_SC_DATA])
+		return -EINVAL;
+
+	id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	sc = rhashtable_lookup_fast(&nsdata->schemas, &id, rht_sc_params);
+	if (sc) {
+		err = -EEXIST;
+		goto out_unlock;
+	}
+
+	len = nla_len(info->attrs[IOAM6_ATTR_SC_DATA]);
+	len_aligned = ALIGN(len, 4);
+
+	sc = kzalloc(sizeof(*sc) + len_aligned, GFP_KERNEL);
+	if (!sc) {
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	sc->id = id;
+	sc->len = len_aligned;
+	sc->hdr = cpu_to_be32(sc->id | ((u8)(sc->len / 4) << 24));
+	nla_memcpy(sc->data, info->attrs[IOAM6_ATTR_SC_DATA], len);
+
+	err = rhashtable_lookup_insert_fast(&nsdata->schemas, &sc->head,
+					    rht_sc_params);
+	if (err)
+		goto free_sc;
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+free_sc:
+	kfree(sc);
+	goto out_unlock;
+}
+
+static int ioam6_genl_delsc(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	struct ioam6_namespace *ns;
+	struct ioam6_schema *sc;
+	int err;
+	u32 id;
+
+	if (!info->attrs[IOAM6_ATTR_SC_ID])
+		return -EINVAL;
+
+	id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	sc = rhashtable_lookup_fast(&nsdata->schemas, &id, rht_sc_params);
+	if (!sc) {
+		err = -ENOENT;
+		goto out_unlock;
+	}
+
+	ns = rcu_dereference_protected(sc->ns, lockdep_is_held(&nsdata->lock));
+
+	err = rhashtable_remove_fast(&nsdata->schemas, &sc->head,
+				     rht_sc_params);
+	if (err)
+		goto out_unlock;
+
+	if (ns)
+		rcu_assign_pointer(ns->schema, NULL);
+
+	ioam6_sc_release(sc);
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static int __ioam6_genl_dumpsc_element(struct ioam6_schema *sc,
+				       u32 portid, u32 seq, u32 flags,
+				       struct sk_buff *skb, u8 cmd)
+{
+	struct ioam6_namespace *ns;
+	void *hdr;
+
+	hdr = genlmsg_put(skb, portid, seq, &ioam6_genl_family, flags, cmd);
+	if (!hdr)
+		return -ENOMEM;
+
+	if (nla_put_u32(skb, IOAM6_ATTR_SC_ID, sc->id) ||
+	    nla_put(skb, IOAM6_ATTR_SC_DATA, sc->len, sc->data))
+		goto nla_put_failure;
+
+	rcu_read_lock();
+
+	ns = rcu_dereference(sc->ns);
+	if (ns && nla_put_u16(skb, IOAM6_ATTR_NS_ID, be16_to_cpu(ns->id))) {
+		rcu_read_unlock();
+		goto nla_put_failure;
+	}
+
+	rcu_read_unlock();
+
+	genlmsg_end(skb, hdr);
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(skb, hdr);
+	return -EMSGSIZE;
+}
+
+static int ioam6_genl_dumpsc_start(struct netlink_callback *cb)
+{
+	struct ioam6_pernet_data *nsdata = ioam6_pernet(sock_net(cb->skb->sk));
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	if (!iter) {
+		iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+		if (!iter)
+			return -ENOMEM;
+
+		cb->args[0] = (long)iter;
+	}
+
+	rhashtable_walk_enter(&nsdata->schemas, iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpsc_done(struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	rhashtable_walk_exit(iter);
+	kfree(iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpsc(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter;
+	struct ioam6_schema *sc;
+	int err;
+
+	iter = (struct rhashtable_iter *)cb->args[0];
+	rhashtable_walk_start(iter);
+
+	for (;;) {
+		sc = rhashtable_walk_next(iter);
+
+		if (IS_ERR(sc)) {
+			if (PTR_ERR(sc) == -EAGAIN)
+				continue;
+			err = PTR_ERR(sc);
+			goto done;
+		} else if (!sc) {
+			break;
+		}
+
+		err = __ioam6_genl_dumpsc_element(sc,
+						  NETLINK_CB(cb->skb).portid,
+						  cb->nlh->nlmsg_seq,
+						  NLM_F_MULTI,
+						  skb,
+						  IOAM6_CMD_DUMP_SCHEMAS);
+		if (err)
+			goto done;
+	}
+
+	err = skb->len;
+
+done:
+	rhashtable_walk_stop(iter);
+	return err;
+}
+
+static int ioam6_genl_ns_set_schema(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_namespace *ns, *ns_ref;
+	struct ioam6_schema *sc, *sc_ref;
+	struct ioam6_pernet_data *nsdata;
+	__be16 ns_id;
+	u32 sc_id;
+	int err;
+
+	if (!info->attrs[IOAM6_ATTR_NS_ID] ||
+	    (!info->attrs[IOAM6_ATTR_SC_ID] &&
+	     !info->attrs[IOAM6_ATTR_SC_NONE]))
+		return -EINVAL;
+
+	ns_id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	ns = rhashtable_lookup_fast(&nsdata->namespaces, &ns_id, rht_ns_params);
+	if (!ns) {
+		err = -ENOENT;
+		goto out_unlock;
+	}
+
+	if (info->attrs[IOAM6_ATTR_SC_NONE]) {
+		sc = NULL;
+	} else {
+		sc_id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
+		sc = rhashtable_lookup_fast(&nsdata->schemas, &sc_id,
+					    rht_sc_params);
+		if (!sc) {
+			err = -ENOENT;
+			goto out_unlock;
+		}
+	}
+
+	sc_ref = rcu_dereference_protected(ns->schema,
+					   lockdep_is_held(&nsdata->lock));
+	if (sc_ref)
+		rcu_assign_pointer(sc_ref->ns, NULL);
+	rcu_assign_pointer(ns->schema, sc);
+
+	if (sc) {
+		ns_ref = rcu_dereference_protected(sc->ns,
+						   lockdep_is_held(&nsdata->lock));
+		if (ns_ref)
+			rcu_assign_pointer(ns_ref->schema, NULL);
+		rcu_assign_pointer(sc->ns, ns);
+	}
+
+	err = 0;
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static const struct genl_ops ioam6_genl_ops[] = {
+	{
+		.cmd	= IOAM6_CMD_ADD_NAMESPACE,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_addns,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_addns,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_addns) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DEL_NAMESPACE,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_delns,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_delns,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_delns) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DUMP_NAMESPACES,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.start	= ioam6_genl_dumpns_start,
+		.dumpit	= ioam6_genl_dumpns,
+		.done	= ioam6_genl_dumpns_done,
+		.flags	= GENL_ADMIN_PERM,
+	},
+	{
+		.cmd	= IOAM6_CMD_ADD_SCHEMA,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_addsc,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_addsc,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_addsc) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DEL_SCHEMA,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_delsc,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_delsc,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_delsc) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DUMP_SCHEMAS,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.start	= ioam6_genl_dumpsc_start,
+		.dumpit	= ioam6_genl_dumpsc,
+		.done	= ioam6_genl_dumpsc_done,
+		.flags	= GENL_ADMIN_PERM,
+	},
+	{
+		.cmd	= IOAM6_CMD_NS_SET_SCHEMA,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_ns_set_schema,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_ns_sc,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_ns_sc) - 1,
+	},
+};
+
+static struct genl_family ioam6_genl_family __ro_after_init = {
+	.name		= IOAM6_GENL_NAME,
+	.version	= IOAM6_GENL_VERSION,
+	.netnsok	= true,
+	.parallel_ops	= true,
+	.ops		= ioam6_genl_ops,
+	.n_ops		= ARRAY_SIZE(ioam6_genl_ops),
+	.module		= THIS_MODULE,
+};
+
 struct ioam6_namespace *ioam6_namespace(struct net *net, __be16 id)
 {
 	struct ioam6_pernet_data *nsdata = ioam6_pernet(net);
@@ -319,15 +867,24 @@ static struct pernet_operations ioam6_net_ops = {
 int __init ioam6_init(void)
 {
 	int err = register_pernet_subsys(&ioam6_net_ops);
+	if (err)
+		goto out;
 
+	err = genl_register_family(&ioam6_genl_family);
 	if (err)
-		return err;
+		goto out_unregister_pernet_subsys;
 
 	pr_info("In-situ OAM (IOAM) with IPv6\n");
-	return 0;
+
+out:
+	return err;
+out_unregister_pernet_subsys:
+	unregister_pernet_subsys(&ioam6_net_ops);
+	goto out;
 }
 
 void ioam6_exit(void)
 {
+	genl_unregister_family(&ioam6_genl_family);
 	unregister_pernet_subsys(&ioam6_net_ops);
 }