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Commit bfff4862 authored by Roopa Prabhu's avatar Roopa Prabhu Committed by David S. Miller
Browse files

net: fib_rules: support for match on ip_proto, sport and dport 



uapi for ip_proto, sport and dport range match
in fib rules.

Signed-off-by: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
Acked-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 29274991

include/net/fib_rules.h

+35 −1
Original line number Diff line number Diff line
@@ -27,7 +27,7 @@ struct fib_rule { 
	u8			action;

	u8			l3mdev;

	u8                      proto;

	/* 1 byte hole, try to use */

	u8			ip_proto;

	u32			target;

	__be64			tun_id;

	struct fib_rule __rcu	*ctarget;
@@ -40,6 +40,8 @@ struct fib_rule { 
	char			iifname[IFNAMSIZ];

	char			oifname[IFNAMSIZ];

	struct fib_kuid_range	uid_range;

	struct fib_rule_port_range	sport_range;

	struct fib_rule_port_range	dport_range;

	struct rcu_head		rcu;

};
@@ -144,6 +146,38 @@ static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 
	return frh->table;

}



static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)

{

	return range->start != 0 && range->end != 0;

}



static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,

					 __be16 port)

{

	return ntohs(port) >= a->start &&

		ntohs(port) <= a->end;

}



static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)

{

	return a->start != 0 && a->end != 0 && a->end < 0xffff &&

		a->start <= a->end;

}



static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,

					       struct fib_rule_port_range *b)

{

	return a->start == b->start &&

		a->end == b->end;

}



static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)

{

	return rule->ip_proto ||

		fib_rule_port_range_set(&rule->sport_range) ||

		fib_rule_port_range_set(&rule->dport_range);

}



struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,

					 struct net *);

void fib_rules_unregister(struct fib_rules_ops *);

include/uapi/linux/fib_rules.h

+8 −0
Original line number Diff line number Diff line
@@ -35,6 +35,11 @@ struct fib_rule_uid_range { 
	__u32		end;

};



struct fib_rule_port_range {

	__u16		start;

	__u16		end;

};



enum {

	FRA_UNSPEC,

	FRA_DST,	/* destination address */
@@ -59,6 +64,9 @@ enum { 
	FRA_L3MDEV,	/* iif or oif is l3mdev goto its table */

	FRA_UID_RANGE,	/* UID range */

	FRA_PROTOCOL,   /* Originator of the rule */

	FRA_IP_PROTO,	/* ip proto */

	FRA_SPORT_RANGE, /* sport */

	FRA_DPORT_RANGE, /* dport */

	__FRA_MAX

};

net/core/fib_rules.c

+90 −2
Original line number Diff line number Diff line
@@ -33,6 +33,10 @@ bool fib_rule_matchall(const struct fib_rule *rule) 
	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);
@@ -221,6 +225,26 @@ static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range) 
	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)
@@ -425,6 +449,17 @@ static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh, 
		    !uid_eq(r->uid_range.end, rule->uid_range.end))

			continue;



		if (r->ip_proto != rule->ip_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;
@@ -569,6 +604,23 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, 
		rule->uid_range = fib_kuid_range_unset;

	}



	if (tb[FRA_IP_PROTO])

		rule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);



	if (tb[FRA_SPORT_RANGE]) {

		err = nla_get_port_range(tb[FRA_SPORT_RANGE],

					 &rule->sport_range);

		if (err)

			goto errout_free;

	}



	if (tb[FRA_DPORT_RANGE]) {

		err = nla_get_port_range(tb[FRA_DPORT_RANGE],

					 &rule->dport_range);

		if (err)

			goto errout_free;

	}



	if ((nlh->nlmsg_flags & NLM_F_EXCL) &&

	    rule_exists(ops, frh, tb, rule)) {

		err = -EEXIST;
@@ -634,6 +686,8 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 
{

	struct net *net = sock_net(skb->sk);

	struct fib_rule_hdr *frh = nlmsg_data(nlh);

	struct fib_rule_port_range sprange = {0, 0};

	struct fib_rule_port_range dprange = {0, 0};

	struct fib_rules_ops *ops = NULL;

	struct fib_rule *rule, *r;

	struct nlattr *tb[FRA_MAX+1];
@@ -667,6 +721,20 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 
		range = fib_kuid_range_unset;

	}



	if (tb[FRA_SPORT_RANGE]) {

		err = nla_get_port_range(tb[FRA_SPORT_RANGE],

					 &sprange);

		if (err)

			goto errout;

	}



	if (tb[FRA_DPORT_RANGE]) {

		err = nla_get_port_range(tb[FRA_DPORT_RANGE],

					 &dprange);

		if (err)

			goto errout;

	}



	list_for_each_entry(rule, &ops->rules_list, list) {

		if (tb[FRA_PROTOCOL] &&

		    (rule->proto != nla_get_u8(tb[FRA_PROTOCOL])))
@@ -712,6 +780,18 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 
		     !uid_eq(rule->uid_range.end, range.end)))

			continue;



		if (tb[FRA_IP_PROTO] &&

		    (rule->ip_proto != nla_get_u8(tb[FRA_IP_PROTO])))

			continue;



		if (fib_rule_port_range_set(&sprange) &&

		    !fib_rule_port_range_compare(&rule->sport_range, &sprange))

			continue;



		if (fib_rule_port_range_set(&dprange) &&

		    !fib_rule_port_range_compare(&rule->dport_range, &dprange))

			continue;



		if (!ops->compare(rule, frh, tb))

			continue;
@@ -790,7 +870,10 @@ static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, 
			 + 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_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);
@@ -855,7 +938,12 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, 
	    (rule->l3mdev &&

	     nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||

	    (uid_range_set(&rule->uid_range) &&

	     nla_put_uid_range(skb, &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) {