Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1235 insertions, 0 deletions

diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
new file mode 100644
index 000000000..46a13ed15
--- /dev/null
+++ b/net/core/fib_rules.c
@@ -0,0 +1,1235 @@
+/*
+ * net/core/fib_rules.c		Generic Routing Rules
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation, version 2.
+ *
+ * Authors:	Thomas Graf <tgraf@suug.ch>
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/fib_rules.h>
+#include <net/ip_tunnels.h>
+
+static const struct fib_kuid_range fib_kuid_range_unset = {
+	KUIDT_INIT(0),
+	KUIDT_INIT(~0),
+};
+
+bool fib_rule_matchall(const struct fib_rule *rule)
+{
+	if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
+	    rule->flags)
+		return false;
+	if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
+		return false;
+	if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
+	    !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
+		return false;
+	if (fib_rule_port_range_set(&rule->sport_range))
+		return false;
+	if (fib_rule_port_range_set(&rule->dport_range))
+		return false;
+	return true;
+}
+EXPORT_SYMBOL_GPL(fib_rule_matchall);
+
+int fib_default_rule_add(struct fib_rules_ops *ops,
+			 u32 pref, u32 table, u32 flags)
+{
+	struct fib_rule *r;
+
+	r = kzalloc(ops->rule_size, GFP_KERNEL);
+	if (r == NULL)
+		return -ENOMEM;
+
+	refcount_set(&r->refcnt, 1);
+	r->action = FR_ACT_TO_TBL;
+	r->pref = pref;
+	r->table = table;
+	r->flags = flags;
+	r->proto = RTPROT_KERNEL;
+	r->fr_net = ops->fro_net;
+	r->uid_range = fib_kuid_range_unset;
+
+	r->suppress_prefixlen = -1;
+	r->suppress_ifgroup = -1;
+
+	/* The lock is not required here, the list in unreacheable
+	 * at the moment this function is called */
+	list_add_tail(&r->list, &ops->rules_list);
+	return 0;
+}
+EXPORT_SYMBOL(fib_default_rule_add);
+
+static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
+{
+	struct list_head *pos;
+	struct fib_rule *rule;
+
+	if (!list_empty(&ops->rules_list)) {
+		pos = ops->rules_list.next;
+		if (pos->next != &ops->rules_list) {
+			rule = list_entry(pos->next, struct fib_rule, list);
+			if (rule->pref)
+				return rule->pref - 1;
+		}
+	}
+
+	return 0;
+}
+
+static void notify_rule_change(int event, struct fib_rule *rule,
+			       struct fib_rules_ops *ops, struct nlmsghdr *nlh,
+			       u32 pid);
+
+static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
+{
+	struct fib_rules_ops *ops;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
+		if (ops->family == family) {
+			if (!try_module_get(ops->owner))
+				ops = NULL;
+			rcu_read_unlock();
+			return ops;
+		}
+	}
+	rcu_read_unlock();
+
+	return NULL;
+}
+
+static void rules_ops_put(struct fib_rules_ops *ops)
+{
+	if (ops)
+		module_put(ops->owner);
+}
+
+static void flush_route_cache(struct fib_rules_ops *ops)
+{
+	if (ops->flush_cache)
+		ops->flush_cache(ops);
+}
+
+static int __fib_rules_register(struct fib_rules_ops *ops)
+{
+	int err = -EEXIST;
+	struct fib_rules_ops *o;
+	struct net *net;
+
+	net = ops->fro_net;
+
+	if (ops->rule_size < sizeof(struct fib_rule))
+		return -EINVAL;
+
+	if (ops->match == NULL || ops->configure == NULL ||
+	    ops->compare == NULL || ops->fill == NULL ||
+	    ops->action == NULL)
+		return -EINVAL;
+
+	spin_lock(&net->rules_mod_lock);
+	list_for_each_entry(o, &net->rules_ops, list)
+		if (ops->family == o->family)
+			goto errout;
+
+	list_add_tail_rcu(&ops->list, &net->rules_ops);
+	err = 0;
+errout:
+	spin_unlock(&net->rules_mod_lock);
+
+	return err;
+}
+
+struct fib_rules_ops *
+fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
+{
+	struct fib_rules_ops *ops;
+	int err;
+
+	ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
+	if (ops == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	INIT_LIST_HEAD(&ops->rules_list);
+	ops->fro_net = net;
+
+	err = __fib_rules_register(ops);
+	if (err) {
+		kfree(ops);
+		ops = ERR_PTR(err);
+	}
+
+	return ops;
+}
+EXPORT_SYMBOL_GPL(fib_rules_register);
+
+static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
+{
+	struct fib_rule *rule, *tmp;
+
+	list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
+		list_del_rcu(&rule->list);
+		if (ops->delete)
+			ops->delete(rule);
+		fib_rule_put(rule);
+	}
+}
+
+void fib_rules_unregister(struct fib_rules_ops *ops)
+{
+	struct net *net = ops->fro_net;
+
+	spin_lock(&net->rules_mod_lock);
+	list_del_rcu(&ops->list);
+	spin_unlock(&net->rules_mod_lock);
+
+	fib_rules_cleanup_ops(ops);
+	kfree_rcu(ops, rcu);
+}
+EXPORT_SYMBOL_GPL(fib_rules_unregister);
+
+static int uid_range_set(struct fib_kuid_range *range)
+{
+	return uid_valid(range->start) && uid_valid(range->end);
+}
+
+static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
+{
+	struct fib_rule_uid_range *in;
+	struct fib_kuid_range out;
+
+	in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
+
+	out.start = make_kuid(current_user_ns(), in->start);
+	out.end = make_kuid(current_user_ns(), in->end);
+
+	return out;
+}
+
+static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
+{
+	struct fib_rule_uid_range out = {
+		from_kuid_munged(current_user_ns(), range->start),
+		from_kuid_munged(current_user_ns(), range->end)
+	};
+
+	return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
+}
+
+static int nla_get_port_range(struct nlattr *pattr,
+			      struct fib_rule_port_range *port_range)
+{
+	const struct fib_rule_port_range *pr = nla_data(pattr);
+
+	if (!fib_rule_port_range_valid(pr))
+		return -EINVAL;
+
+	port_range->start = pr->start;
+	port_range->end = pr->end;
+
+	return 0;
+}
+
+static int nla_put_port_range(struct sk_buff *skb, int attrtype,
+			      struct fib_rule_port_range *range)
+{
+	return nla_put(skb, attrtype, sizeof(*range), range);
+}
+
+static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
+			  struct flowi *fl, int flags,
+			  struct fib_lookup_arg *arg)
+{
+	int ret = 0;
+
+	if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
+		goto out;
+
+	if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
+		goto out;
+
+	if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
+		goto out;
+
+	if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
+		goto out;
+
+	if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
+		goto out;
+
+	if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
+	    uid_gt(fl->flowi_uid, rule->uid_range.end))
+		goto out;
+
+	ret = ops->match(rule, fl, flags);
+out:
+	return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
+}
+
+int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
+		     int flags, struct fib_lookup_arg *arg)
+{
+	struct fib_rule *rule;
+	int err;
+
+	rcu_read_lock();
+
+	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
+jumped:
+		if (!fib_rule_match(rule, ops, fl, flags, arg))
+			continue;
+
+		if (rule->action == FR_ACT_GOTO) {
+			struct fib_rule *target;
+
+			target = rcu_dereference(rule->ctarget);
+			if (target == NULL) {
+				continue;
+			} else {
+				rule = target;
+				goto jumped;
+			}
+		} else if (rule->action == FR_ACT_NOP)
+			continue;
+		else
+			err = ops->action(rule, fl, flags, arg);
+
+		if (!err && ops->suppress && ops->suppress(rule, arg))
+			continue;
+
+		if (err != -EAGAIN) {
+			if ((arg->flags & FIB_LOOKUP_NOREF) ||
+			    likely(refcount_inc_not_zero(&rule->refcnt))) {
+				arg->rule = rule;
+				goto out;
+			}
+			break;
+		}
+	}
+
+	err = -ESRCH;
+out:
+	rcu_read_unlock();
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(fib_rules_lookup);
+
+static int call_fib_rule_notifier(struct notifier_block *nb, struct net *net,
+				  enum fib_event_type event_type,
+				  struct fib_rule *rule, int family)
+{
+	struct fib_rule_notifier_info info = {
+		.info.family = family,
+		.rule = rule,
+	};
+
+	return call_fib_notifier(nb, net, event_type, &info.info);
+}
+
+static int call_fib_rule_notifiers(struct net *net,
+				   enum fib_event_type event_type,
+				   struct fib_rule *rule,
+				   struct fib_rules_ops *ops,
+				   struct netlink_ext_ack *extack)
+{
+	struct fib_rule_notifier_info info = {
+		.info.family = ops->family,
+		.info.extack = extack,
+		.rule = rule,
+	};
+
+	ops->fib_rules_seq++;
+	return call_fib_notifiers(net, event_type, &info.info);
+}
+
+/* Called with rcu_read_lock() */
+int fib_rules_dump(struct net *net, struct notifier_block *nb, int family)
+{
+	struct fib_rules_ops *ops;
+	struct fib_rule *rule;
+
+	ops = lookup_rules_ops(net, family);
+	if (!ops)
+		return -EAFNOSUPPORT;
+	list_for_each_entry_rcu(rule, &ops->rules_list, list)
+		call_fib_rule_notifier(nb, net, FIB_EVENT_RULE_ADD, rule,
+				       family);
+	rules_ops_put(ops);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fib_rules_dump);
+
+unsigned int fib_rules_seq_read(struct net *net, int family)
+{
+	unsigned int fib_rules_seq;
+	struct fib_rules_ops *ops;
+
+	ASSERT_RTNL();
+
+	ops = lookup_rules_ops(net, family);
+	if (!ops)
+		return 0;
+	fib_rules_seq = ops->fib_rules_seq;
+	rules_ops_put(ops);
+
+	return fib_rules_seq;
+}
+EXPORT_SYMBOL_GPL(fib_rules_seq_read);
+
+static struct fib_rule *rule_find(struct fib_rules_ops *ops,
+				  struct fib_rule_hdr *frh,
+				  struct nlattr **tb,
+				  struct fib_rule *rule,
+				  bool user_priority)
+{
+	struct fib_rule *r;
+
+	list_for_each_entry(r, &ops->rules_list, list) {
+		if (rule->action && r->action != rule->action)
+			continue;
+
+		if (rule->table && r->table != rule->table)
+			continue;
+
+		if (user_priority && r->pref != rule->pref)
+			continue;
+
+		if (rule->iifname[0] &&
+		    memcmp(r->iifname, rule->iifname, IFNAMSIZ))
+			continue;
+
+		if (rule->oifname[0] &&
+		    memcmp(r->oifname, rule->oifname, IFNAMSIZ))
+			continue;
+
+		if (rule->mark && r->mark != rule->mark)
+			continue;
+
+		if (rule->suppress_ifgroup != -1 &&
+		    r->suppress_ifgroup != rule->suppress_ifgroup)
+			continue;
+
+		if (rule->suppress_prefixlen != -1 &&
+		    r->suppress_prefixlen != rule->suppress_prefixlen)
+			continue;
+
+		if (rule->mark_mask && r->mark_mask != rule->mark_mask)
+			continue;
+
+		if (rule->tun_id && r->tun_id != rule->tun_id)
+			continue;
+
+		if (r->fr_net != rule->fr_net)
+			continue;
+
+		if (rule->l3mdev && r->l3mdev != rule->l3mdev)
+			continue;
+
+		if (uid_range_set(&rule->uid_range) &&
+		    (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
+		    !uid_eq(r->uid_range.end, rule->uid_range.end)))
+			continue;
+
+		if (rule->ip_proto && r->ip_proto != rule->ip_proto)
+			continue;
+
+		if (rule->proto && r->proto != rule->proto)
+			continue;
+
+		if (fib_rule_port_range_set(&rule->sport_range) &&
+		    !fib_rule_port_range_compare(&r->sport_range,
+						 &rule->sport_range))
+			continue;
+
+		if (fib_rule_port_range_set(&rule->dport_range) &&
+		    !fib_rule_port_range_compare(&r->dport_range,
+						 &rule->dport_range))
+			continue;
+
+		if (!ops->compare(r, frh, tb))
+			continue;
+		return r;
+	}
+
+	return NULL;
+}
+
+#ifdef CONFIG_NET_L3_MASTER_DEV
+static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
+			      struct netlink_ext_ack *extack)
+{
+	nlrule->l3mdev = nla_get_u8(nla);
+	if (nlrule->l3mdev != 1) {
+		NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
+		return -1;
+	}
+
+	return 0;
+}
+#else
+static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
+			      struct netlink_ext_ack *extack)
+{
+	NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
+	return -1;
+}
+#endif
+
+static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
+		       struct netlink_ext_ack *extack,
+		       struct fib_rules_ops *ops,
+		       struct nlattr *tb[],
+		       struct fib_rule **rule,
+		       bool *user_priority)
+{
+	struct net *net = sock_net(skb->sk);
+	struct fib_rule_hdr *frh = nlmsg_data(nlh);
+	struct fib_rule *nlrule = NULL;
+	int err = -EINVAL;
+
+	if (frh->src_len)
+		if (!tb[FRA_SRC] ||
+		    frh->src_len > (ops->addr_size * 8) ||
+		    nla_len(tb[FRA_SRC]) != ops->addr_size) {
+			NL_SET_ERR_MSG(extack, "Invalid source address");
+			goto errout;
+	}
+
+	if (frh->dst_len)
+		if (!tb[FRA_DST] ||
+		    frh->dst_len > (ops->addr_size * 8) ||
+		    nla_len(tb[FRA_DST]) != ops->addr_size) {
+			NL_SET_ERR_MSG(extack, "Invalid dst address");
+			goto errout;
+	}
+
+	nlrule = kzalloc(ops->rule_size, GFP_KERNEL);
+	if (!nlrule) {
+		err = -ENOMEM;
+		goto errout;
+	}
+	refcount_set(&nlrule->refcnt, 1);
+	nlrule->fr_net = net;
+
+	if (tb[FRA_PRIORITY]) {
+		nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]);
+		*user_priority = true;
+	} else {
+		nlrule->pref = fib_default_rule_pref(ops);
+	}
+
+	nlrule->proto = tb[FRA_PROTOCOL] ?
+		nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC;
+
+	if (tb[FRA_IIFNAME]) {
+		struct net_device *dev;
+
+		nlrule->iifindex = -1;
+		nla_strlcpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
+		dev = __dev_get_by_name(net, nlrule->iifname);
+		if (dev)
+			nlrule->iifindex = dev->ifindex;
+	}
+
+	if (tb[FRA_OIFNAME]) {
+		struct net_device *dev;
+
+		nlrule->oifindex = -1;
+		nla_strlcpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
+		dev = __dev_get_by_name(net, nlrule->oifname);
+		if (dev)
+			nlrule->oifindex = dev->ifindex;
+	}
+
+	if (tb[FRA_FWMARK]) {
+		nlrule->mark = nla_get_u32(tb[FRA_FWMARK]);
+		if (nlrule->mark)
+			/* compatibility: if the mark value is non-zero all bits
+			 * are compared unless a mask is explicitly specified.
+			 */
+			nlrule->mark_mask = 0xFFFFFFFF;
+	}
+
+	if (tb[FRA_FWMASK])
+		nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
+
+	if (tb[FRA_TUN_ID])
+		nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
+
+	err = -EINVAL;
+	if (tb[FRA_L3MDEV] &&
+	    fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
+		goto errout_free;
+
+	nlrule->action = frh->action;
+	nlrule->flags = frh->flags;
+	nlrule->table = frh_get_table(frh, tb);
+	if (tb[FRA_SUPPRESS_PREFIXLEN])
+		nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
+	else
+		nlrule->suppress_prefixlen = -1;
+
+	if (tb[FRA_SUPPRESS_IFGROUP])
+		nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
+	else
+		nlrule->suppress_ifgroup = -1;
+
+	if (tb[FRA_GOTO]) {
+		if (nlrule->action != FR_ACT_GOTO) {
+			NL_SET_ERR_MSG(extack, "Unexpected goto");
+			goto errout_free;
+		}
+
+		nlrule->target = nla_get_u32(tb[FRA_GOTO]);
+		/* Backward jumps are prohibited to avoid endless loops */
+		if (nlrule->target <= nlrule->pref) {
+			NL_SET_ERR_MSG(extack, "Backward goto not supported");
+			goto errout_free;
+		}
+	} else if (nlrule->action == FR_ACT_GOTO) {
+		NL_SET_ERR_MSG(extack, "Missing goto target for action goto");
+		goto errout_free;
+	}
+
+	if (nlrule->l3mdev && nlrule->table) {
+		NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive");
+		goto errout_free;
+	}
+
+	if (tb[FRA_UID_RANGE]) {
+		if (current_user_ns() != net->user_ns) {
+			err = -EPERM;
+			NL_SET_ERR_MSG(extack, "No permission to set uid");
+			goto errout_free;
+		}
+
+		nlrule->uid_range = nla_get_kuid_range(tb);
+
+		if (!uid_range_set(&nlrule->uid_range) ||
+		    !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) {
+			NL_SET_ERR_MSG(extack, "Invalid uid range");
+			goto errout_free;
+		}
+	} else {
+		nlrule->uid_range = fib_kuid_range_unset;
+	}
+
+	if (tb[FRA_IP_PROTO])
+		nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);
+
+	if (tb[FRA_SPORT_RANGE]) {
+		err = nla_get_port_range(tb[FRA_SPORT_RANGE],
+					 &nlrule->sport_range);
+		if (err) {
+			NL_SET_ERR_MSG(extack, "Invalid sport range");
+			goto errout_free;
+		}
+	}
+
+	if (tb[FRA_DPORT_RANGE]) {
+		err = nla_get_port_range(tb[FRA_DPORT_RANGE],
+					 &nlrule->dport_range);
+		if (err) {
+			NL_SET_ERR_MSG(extack, "Invalid dport range");
+			goto errout_free;
+		}
+	}
+
+	*rule = nlrule;
+
+	return 0;
+
+errout_free:
+	kfree(nlrule);
+errout:
+	return err;
+}
+
+static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
+		       struct nlattr **tb, struct fib_rule *rule)
+{
+	struct fib_rule *r;
+
+	list_for_each_entry(r, &ops->rules_list, list) {
+		if (r->action != rule->action)
+			continue;
+
+		if (r->table != rule->table)
+			continue;
+
+		if (r->pref != rule->pref)
+			continue;
+
+		if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
+			continue;
+
+		if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
+			continue;
+
+		if (r->mark != rule->mark)
+			continue;
+
+		if (r->suppress_ifgroup != rule->suppress_ifgroup)
+			continue;
+
+		if (r->suppress_prefixlen != rule->suppress_prefixlen)
+			continue;
+
+		if (r->mark_mask != rule->mark_mask)
+			continue;
+
+		if (r->tun_id != rule->tun_id)
+			continue;
+
+		if (r->fr_net != rule->fr_net)
+			continue;
+
+		if (r->l3mdev != rule->l3mdev)
+			continue;
+
+		if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
+		    !uid_eq(r->uid_range.end, rule->uid_range.end))
+			continue;
+
+		if (r->ip_proto != rule->ip_proto)
+			continue;
+
+		if (r->proto != rule->proto)
+			continue;
+
+		if (!fib_rule_port_range_compare(&r->sport_range,
+						 &rule->sport_range))
+			continue;
+
+		if (!fib_rule_port_range_compare(&r->dport_range,
+						 &rule->dport_range))
+			continue;
+
+		if (!ops->compare(r, frh, tb))
+			continue;
+		return 1;
+	}
+	return 0;
+}
+
+int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
+		   struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	struct fib_rule_hdr *frh = nlmsg_data(nlh);
+	struct fib_rules_ops *ops = NULL;
+	struct fib_rule *rule = NULL, *r, *last = NULL;
+	struct nlattr *tb[FRA_MAX + 1];
+	int err = -EINVAL, unresolved = 0;
+	bool user_priority = false;
+
+	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
+		NL_SET_ERR_MSG(extack, "Invalid msg length");
+		goto errout;
+	}
+
+	ops = lookup_rules_ops(net, frh->family);
+	if (!ops) {
+		err = -EAFNOSUPPORT;
+		NL_SET_ERR_MSG(extack, "Rule family not supported");
+		goto errout;
+	}
+
+	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
+	if (err < 0) {
+		NL_SET_ERR_MSG(extack, "Error parsing msg");
+		goto errout;
+	}
+
+	err = fib_nl2rule(skb, nlh, extack, ops, tb, &rule, &user_priority);
+	if (err)
+		goto errout;
+
+	if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
+	    rule_exists(ops, frh, tb, rule)) {
+		err = -EEXIST;
+		goto errout_free;
+	}
+
+	err = ops->configure(rule, skb, frh, tb, extack);
+	if (err < 0)
+		goto errout_free;
+
+	err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops,
+				      extack);
+	if (err < 0)
+		goto errout_free;
+
+	list_for_each_entry(r, &ops->rules_list, list) {
+		if (r->pref == rule->target) {
+			RCU_INIT_POINTER(rule->ctarget, r);
+			break;
+		}
+	}
+
+	if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
+		unresolved = 1;
+
+	list_for_each_entry(r, &ops->rules_list, list) {
+		if (r->pref > rule->pref)
+			break;
+		last = r;
+	}
+
+	if (last)
+		list_add_rcu(&rule->list, &last->list);
+	else
+		list_add_rcu(&rule->list, &ops->rules_list);
+
+	if (ops->unresolved_rules) {
+		/*
+		 * There are unresolved goto rules in the list, check if
+		 * any of them are pointing to this new rule.
+		 */
+		list_for_each_entry(r, &ops->rules_list, list) {
+			if (r->action == FR_ACT_GOTO &&
+			    r->target == rule->pref &&
+			    rtnl_dereference(r->ctarget) == NULL) {
+				rcu_assign_pointer(r->ctarget, rule);
+				if (--ops->unresolved_rules == 0)
+					break;
+			}
+		}
+	}
+
+	if (rule->action == FR_ACT_GOTO)
+		ops->nr_goto_rules++;
+
+	if (unresolved)
+		ops->unresolved_rules++;
+
+	if (rule->tun_id)
+		ip_tunnel_need_metadata();
+
+	notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
+	flush_route_cache(ops);
+	rules_ops_put(ops);
+	return 0;
+
+errout_free:
+	kfree(rule);
+errout:
+	rules_ops_put(ops);
+	return err;
+}
+EXPORT_SYMBOL_GPL(fib_nl_newrule);
+
+int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
+		   struct netlink_ext_ack *extack)
+{
+	struct net *net = sock_net(skb->sk);
+	struct fib_rule_hdr *frh = nlmsg_data(nlh);
+	struct fib_rules_ops *ops = NULL;
+	struct fib_rule *rule = NULL, *r, *nlrule = NULL;
+	struct nlattr *tb[FRA_MAX+1];
+	int err = -EINVAL;
+	bool user_priority = false;
+
+	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
+		NL_SET_ERR_MSG(extack, "Invalid msg length");
+		goto errout;
+	}
+
+	ops = lookup_rules_ops(net, frh->family);
+	if (ops == NULL) {
+		err = -EAFNOSUPPORT;
+		NL_SET_ERR_MSG(extack, "Rule family not supported");
+		goto errout;
+	}
+
+	err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
+	if (err < 0) {
+		NL_SET_ERR_MSG(extack, "Error parsing msg");
+		goto errout;
+	}
+
+	err = fib_nl2rule(skb, nlh, extack, ops, tb, &nlrule, &user_priority);
+	if (err)
+		goto errout;
+
+	rule = rule_find(ops, frh, tb, nlrule, user_priority);
+	if (!rule) {
+		err = -ENOENT;
+		goto errout;
+	}
+
+	if (rule->flags & FIB_RULE_PERMANENT) {
+		err = -EPERM;
+		goto errout;
+	}
+
+	if (ops->delete) {
+		err = ops->delete(rule);
+		if (err)
+			goto errout;
+	}
+
+	if (rule->tun_id)
+		ip_tunnel_unneed_metadata();
+
+	list_del_rcu(&rule->list);
+
+	if (rule->action == FR_ACT_GOTO) {
+		ops->nr_goto_rules--;
+		if (rtnl_dereference(rule->ctarget) == NULL)
+			ops->unresolved_rules--;
+	}
+
+	/*
+	 * Check if this rule is a target to any of them. If so,
+	 * adjust to the next one with the same preference or
+	 * disable them. As this operation is eventually very
+	 * expensive, it is only performed if goto rules, except
+	 * current if it is goto rule, have actually been added.
+	 */
+	if (ops->nr_goto_rules > 0) {
+		struct fib_rule *n;
+
+		n = list_next_entry(rule, list);
+		if (&n->list == &ops->rules_list || n->pref != rule->pref)
+			n = NULL;
+		list_for_each_entry(r, &ops->rules_list, list) {
+			if (rtnl_dereference(r->ctarget) != rule)
+				continue;
+			rcu_assign_pointer(r->ctarget, n);
+			if (!n)
+				ops->unresolved_rules++;
+		}
+	}
+
+	call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops,
+				NULL);
+	notify_rule_change(RTM_DELRULE, rule, ops, nlh,
+			   NETLINK_CB(skb).portid);
+	fib_rule_put(rule);
+	flush_route_cache(ops);
+	rules_ops_put(ops);
+	kfree(nlrule);
+	return 0;
+
+errout:
+	kfree(nlrule);
+	rules_ops_put(ops);
+	return err;
+}
+EXPORT_SYMBOL_GPL(fib_nl_delrule);
+
+static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
+					 struct fib_rule *rule)
+{
+	size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
+			 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
+			 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
+			 + nla_total_size(4) /* FRA_PRIORITY */
+			 + nla_total_size(4) /* FRA_TABLE */
+			 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
+			 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
+			 + nla_total_size(4) /* FRA_FWMARK */
+			 + nla_total_size(4) /* FRA_FWMASK */
+			 + nla_total_size_64bit(8) /* FRA_TUN_ID */
+			 + nla_total_size(sizeof(struct fib_kuid_range))
+			 + nla_total_size(1) /* FRA_PROTOCOL */
+			 + nla_total_size(1) /* FRA_IP_PROTO */
+			 + nla_total_size(sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */
+			 + nla_total_size(sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */
+
+	if (ops->nlmsg_payload)
+		payload += ops->nlmsg_payload(rule);
+
+	return payload;
+}
+
+static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
+			    u32 pid, u32 seq, int type, int flags,
+			    struct fib_rules_ops *ops)
+{
+	struct nlmsghdr *nlh;
+	struct fib_rule_hdr *frh;
+
+	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
+	if (nlh == NULL)
+		return -EMSGSIZE;
+
+	frh = nlmsg_data(nlh);
+	frh->family = ops->family;
+	frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT;
+	if (nla_put_u32(skb, FRA_TABLE, rule->table))
+		goto nla_put_failure;
+	if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
+		goto nla_put_failure;
+	frh->res1 = 0;
+	frh->res2 = 0;
+	frh->action = rule->action;
+	frh->flags = rule->flags;
+
+	if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
+		goto nla_put_failure;
+
+	if (rule->action == FR_ACT_GOTO &&
+	    rcu_access_pointer(rule->ctarget) == NULL)
+		frh->flags |= FIB_RULE_UNRESOLVED;
+
+	if (rule->iifname[0]) {
+		if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
+			goto nla_put_failure;
+		if (rule->iifindex == -1)
+			frh->flags |= FIB_RULE_IIF_DETACHED;
+	}
+
+	if (rule->oifname[0]) {
+		if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
+			goto nla_put_failure;
+		if (rule->oifindex == -1)
+			frh->flags |= FIB_RULE_OIF_DETACHED;
+	}
+
+	if ((rule->pref &&
+	     nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
+	    (rule->mark &&
+	     nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
+	    ((rule->mark_mask || rule->mark) &&
+	     nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
+	    (rule->target &&
+	     nla_put_u32(skb, FRA_GOTO, rule->target)) ||
+	    (rule->tun_id &&
+	     nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
+	    (rule->l3mdev &&
+	     nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
+	    (uid_range_set(&rule->uid_range) &&
+	     nla_put_uid_range(skb, &rule->uid_range)) ||
+	    (fib_rule_port_range_set(&rule->sport_range) &&
+	     nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
+	    (fib_rule_port_range_set(&rule->dport_range) &&
+	     nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) ||
+	    (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto)))
+		goto nla_put_failure;
+
+	if (rule->suppress_ifgroup != -1) {
+		if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
+			goto nla_put_failure;
+	}
+
+	if (ops->fill(rule, skb, frh) < 0)
+		goto nla_put_failure;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
+		      struct fib_rules_ops *ops)
+{
+	int idx = 0;
+	struct fib_rule *rule;
+	int err = 0;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(rule, &ops->rules_list, list) {
+		if (idx < cb->args[1])
+			goto skip;
+
+		err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
+				       cb->nlh->nlmsg_seq, RTM_NEWRULE,
+				       NLM_F_MULTI, ops);
+		if (err)
+			break;
+skip:
+		idx++;
+	}
+	rcu_read_unlock();
+	cb->args[1] = idx;
+	rules_ops_put(ops);
+
+	return err;
+}
+
+static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	struct fib_rules_ops *ops;
+	int idx = 0, family;
+
+	family = rtnl_msg_family(cb->nlh);
+	if (family != AF_UNSPEC) {
+		/* Protocol specific dump request */
+		ops = lookup_rules_ops(net, family);
+		if (ops == NULL)
+			return -EAFNOSUPPORT;
+
+		dump_rules(skb, cb, ops);
+
+		return skb->len;
+	}
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(ops, &net->rules_ops, list) {
+		if (idx < cb->args[0] || !try_module_get(ops->owner))
+			goto skip;
+
+		if (dump_rules(skb, cb, ops) < 0)
+			break;
+
+		cb->args[1] = 0;
+skip:
+		idx++;
+	}
+	rcu_read_unlock();
+	cb->args[0] = idx;
+
+	return skb->len;
+}
+
+static void notify_rule_change(int event, struct fib_rule *rule,
+			       struct fib_rules_ops *ops, struct nlmsghdr *nlh,
+			       u32 pid)
+{
+	struct net *net;
+	struct sk_buff *skb;
+	int err = -ENOMEM;
+
+	net = ops->fro_net;
+	skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
+	if (skb == NULL)
+		goto errout;
+
+	err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+
+	rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
+	return;
+errout:
+	if (err < 0)
+		rtnl_set_sk_err(net, ops->nlgroup, err);
+}
+
+static void attach_rules(struct list_head *rules, struct net_device *dev)
+{
+	struct fib_rule *rule;
+
+	list_for_each_entry(rule, rules, list) {
+		if (rule->iifindex == -1 &&
+		    strcmp(dev->name, rule->iifname) == 0)
+			rule->iifindex = dev->ifindex;
+		if (rule->oifindex == -1 &&
+		    strcmp(dev->name, rule->oifname) == 0)
+			rule->oifindex = dev->ifindex;
+	}
+}
+
+static void detach_rules(struct list_head *rules, struct net_device *dev)
+{
+	struct fib_rule *rule;
+
+	list_for_each_entry(rule, rules, list) {
+		if (rule->iifindex == dev->ifindex)
+			rule->iifindex = -1;
+		if (rule->oifindex == dev->ifindex)
+			rule->oifindex = -1;
+	}
+}
+
+
+static int fib_rules_event(struct notifier_block *this, unsigned long event,
+			   void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct net *net = dev_net(dev);
+	struct fib_rules_ops *ops;
+
+	ASSERT_RTNL();
+
+	switch (event) {
+	case NETDEV_REGISTER:
+		list_for_each_entry(ops, &net->rules_ops, list)
+			attach_rules(&ops->rules_list, dev);
+		break;
+
+	case NETDEV_CHANGENAME:
+		list_for_each_entry(ops, &net->rules_ops, list) {
+			detach_rules(&ops->rules_list, dev);
+			attach_rules(&ops->rules_list, dev);
+		}
+		break;
+
+	case NETDEV_UNREGISTER:
+		list_for_each_entry(ops, &net->rules_ops, list)
+			detach_rules(&ops->rules_list, dev);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block fib_rules_notifier = {
+	.notifier_call = fib_rules_event,
+};
+
+static int __net_init fib_rules_net_init(struct net *net)
+{
+	INIT_LIST_HEAD(&net->rules_ops);
+	spin_lock_init(&net->rules_mod_lock);
+	return 0;
+}
+
+static void __net_exit fib_rules_net_exit(struct net *net)
+{
+	WARN_ON_ONCE(!list_empty(&net->rules_ops));
+}
+
+static struct pernet_operations fib_rules_net_ops = {
+	.init = fib_rules_net_init,
+	.exit = fib_rules_net_exit,
+};
+
+static int __init fib_rules_init(void)
+{
+	int err;
+	rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
+	rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
+	rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
+
+	err = register_pernet_subsys(&fib_rules_net_ops);
+	if (err < 0)
+		goto fail;
+
+	err = register_netdevice_notifier(&fib_rules_notifier);
+	if (err < 0)
+		goto fail_unregister;
+
+	return 0;
+
+fail_unregister:
+	unregister_pernet_subsys(&fib_rules_net_ops);
+fail:
+	rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
+	rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
+	rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
+	return err;
+}
+
+subsys_initcall(fib_rules_init);