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Message-Id: <1519537482-6861-2-git-send-email-roopa@cumulusnetworks.com>
Date: Sat, 24 Feb 2018 21:44:38 -0800
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Cc: dsa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
idosch@...lanox.com
Subject: [PATCH net-next 1/5] net: fib_rules: support for match on ip_proto, sport and dport
From: Roopa Prabhu <roopa@...ulusnetworks.com>
uapi for ip_proto, sport and dport range match
in fib rules.
Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
include/net/fib_rules.h | 31 +++++++++++++-
include/uapi/linux/fib_rules.h | 8 ++++
net/core/fib_rules.c | 94 +++++++++++++++++++++++++++++++++++++++++-
3 files changed, 130 insertions(+), 3 deletions(-)
diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
index b3d2162..6d99202 100644
--- a/include/net/fib_rules.h
+++ b/include/net/fib_rules.h
@@ -11,6 +11,11 @@
#include <net/rtnetlink.h>
#include <net/fib_notifier.h>
+struct fib_port_range {
+ __u16 start;
+ __u16 end;
+};
+
struct fib_kuid_range {
kuid_t start;
kuid_t end;
@@ -27,7 +32,7 @@ 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 +45,8 @@ struct fib_rule {
char iifname[IFNAMSIZ];
char oifname[IFNAMSIZ];
struct fib_kuid_range uid_range;
+ struct fib_port_range sport_range;
+ struct fib_port_range dport_range;
struct rcu_head rcu;
};
@@ -144,6 +151,28 @@ static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
return frh->table;
}
+static inline bool fib_rule_port_inrange(struct fib_port_range *a,
+ __be16 port)
+{
+ if (!a->start)
+ return true;
+ return ntohs(port) >= a->start &&
+ ntohs(port) <= a->end;
+}
+
+static inline bool fib_rule_port_range_valid(const struct fib_port_range *a)
+{
+ return a->start > 0 && a->end < 0xffff &&
+ a->start <= a->end;
+}
+
+static inline bool fib_rule_port_range_compare(struct fib_port_range *a,
+ struct fib_port_range *b)
+{
+ return a->start == b->start &&
+ a->end == b->end;
+}
+
struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
struct net *);
void fib_rules_unregister(struct fib_rules_ops *);
diff --git a/include/uapi/linux/fib_rules.h b/include/uapi/linux/fib_rules.h
index 77d90ae..232df14 100644
--- a/include/uapi/linux/fib_rules.h
+++ b/include/uapi/linux/fib_rules.h
@@ -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
};
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index a6aea80..5008235 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -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_valid(&rule->sport_range))
+ return false;
+ if (fib_rule_port_range_valid(&rule->dport_range))
+ return false;
return true;
}
EXPORT_SYMBOL_GPL(fib_rule_matchall);
@@ -221,6 +225,12 @@ 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_put_port_range(struct sk_buff *skb, int attrtype,
+ struct fib_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 +435,17 @@ 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;
@@ -432,6 +453,20 @@ static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
return 0;
}
+static int nla_get_port_range(struct nlattr *pattr,
+ struct fib_port_range *port_range)
+{
+ const struct fib_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;
+}
+
int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@@ -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;
@@ -638,6 +690,8 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
struct fib_rule *rule, *r;
struct nlattr *tb[FRA_MAX+1];
struct fib_kuid_range range;
+ struct fib_port_range *sprange = NULL;
+ struct fib_port_range *dprange = NULL;
int err = -EINVAL;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
@@ -667,6 +721,22 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
range = fib_kuid_range_unset;
}
+ if (tb[FRA_SPORT_RANGE]) {
+ sprange = nla_data(tb[FRA_SPORT_RANGE]);
+ if (!fib_rule_port_range_valid(sprange)) {
+ err = -EINVAL;
+ goto errout;
+ }
+ }
+
+ if (tb[FRA_DPORT_RANGE]) {
+ dprange = nla_data(tb[FRA_DPORT_RANGE]);
+ if (!fib_rule_port_range_valid(dprange)) {
+ err = -EINVAL;
+ 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 +782,18 @@ 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 (sprange &&
+ !fib_rule_port_range_compare(&rule->sport_range, sprange))
+ continue;
+
+ if (dprange &&
+ !fib_rule_port_range_compare(&rule->dport_range, dprange))
+ continue;
+
if (!ops->compare(rule, frh, tb))
continue;
@@ -790,7 +872,10 @@ 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_port_range)) /* FRA_SPORT_RANGE */
+ + nla_total_size(sizeof(struct fib_port_range)); /* FRA_DPORT_RANGE */
if (ops->nlmsg_payload)
payload += ops->nlmsg_payload(rule);
@@ -855,7 +940,12 @@ 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_valid(&rule->sport_range) &&
+ nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
+ (fib_rule_port_range_valid(&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) {
--
2.1.4
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