netfilter: ipset: fix adding ranges to hash types

When ranges are added to hash types, the elements may trigger rehashing
the set. However, the last successfully added element was not kept track
so the adding started again with the first element after the rehashing.

Bug reported by Mr Dash Four.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>

include/linux/netfilter/ipset/ip_set.h

@@ -244,7 +244,7 @@ struct ip_set_type_variant {
 	 *			zero for no match/success to add/delete
 	 *			positive for matching element */
 	int (*uadt)(struct ip_set *set, struct nlattr *tb[],
-		    enum ipset_adt adt, u32 *lineno, u32 flags);
+		    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);
 
 	/* Low level add/del/test functions */
 	ipset_adtfn adt[IPSET_ADT_MAX];

include/linux/netfilter/ipset/ip_set_ahash.h

@@ -5,6 +5,11 @@
 #include <linux/jhash.h>
 #include <linux/netfilter/ipset/ip_set_timeout.h>
 
+#define CONCAT(a, b, c)		a##b##c
+#define TOKEN(a, b, c)		CONCAT(a, b, c)
+
+#define type_pf_next		TOKEN(TYPE, PF, _elem)
+
 /* Hashing which uses arrays to resolve clashing. The hash table is resized
  * (doubled) when searching becomes too long.
  * Internally jhash is used with the assumption that the size of the
@@ -54,6 +59,7 @@ struct ip_set_hash {
 	u32 initval;		/* random jhash init value */
 	u32 timeout;		/* timeout value, if enabled */
 	struct timer_list gc;	/* garbage collection when timeout enabled */
+	struct type_pf_next next; /* temporary storage for uadd */
 #ifdef IP_SET_HASH_WITH_NETMASK
 	u8 netmask;		/* netmask value for subnets to store */
 #endif
@@ -217,6 +223,7 @@ ip_set_hash_destroy(struct ip_set *set)
 #define type_pf_data_netmask	TOKEN(TYPE, PF, _data_netmask)
 #define type_pf_data_list	TOKEN(TYPE, PF, _data_list)
 #define type_pf_data_tlist	TOKEN(TYPE, PF, _data_tlist)
+#define type_pf_data_next	TOKEN(TYPE, PF, _data_next)
 
 #define type_pf_elem		TOKEN(TYPE, PF, _elem)
 #define type_pf_telem		TOKEN(TYPE, PF, _telem)
@@ -346,6 +353,9 @@ type_pf_resize(struct ip_set *set, bool retried)
 	return 0;
 }
 
+static inline void
+type_pf_data_next(struct ip_set_hash *h, const struct type_pf_elem *d);
+
 /* Add an element to a hash and update the internal counters when succeeded,
  * otherwise report the proper error code. */
 static int
@@ -372,8 +382,11 @@ type_pf_add(struct ip_set *set, void *value, u32 timeout, u32 flags)
 		}
 
 	ret = type_pf_elem_add(n, value);
-	if (ret != 0)
+	if (ret != 0) {
+		if (ret == -EAGAIN)
+			type_pf_data_next(h, d);
 		goto out;
+	}
 
 #ifdef IP_SET_HASH_WITH_NETS
 	add_cidr(h, d->cidr, HOST_MASK);
@@ -589,7 +602,7 @@ type_pf_kadt(struct ip_set *set, const struct sk_buff * skb,
 	     enum ipset_adt adt, const struct ip_set_adt_opt *opt);
 static int
 type_pf_uadt(struct ip_set *set, struct nlattr *tb[],
-	     enum ipset_adt adt, u32 *lineno, u32 flags);
+	     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);
 
 static const struct ip_set_type_variant type_pf_variant = {
 	.kadt	= type_pf_kadt,
@@ -821,8 +834,11 @@ type_pf_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags)
 		goto out;
 	}
 	ret = type_pf_elem_tadd(n, d, timeout);
-	if (ret != 0)
+	if (ret != 0) {
+		if (ret == -EEXIST)
+			type_pf_data_next(h, d);
 		goto out;
+	}
 
 #ifdef IP_SET_HASH_WITH_NETS
 	add_cidr(h, d->cidr, HOST_MASK);

net/netfilter/ipset/ip_set_bitmap_ip.c

@@ -236,7 +236,7 @@ bitmap_ip_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[],
-	       enum ipset_adt adt, u32 *lineno, u32 flags)
+	       enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	struct bitmap_ip *map = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];

net/netfilter/ipset/ip_set_bitmap_ipmac.c

@@ -365,7 +365,7 @@ bitmap_ipmac_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 bitmap_ipmac_uadt(struct ip_set *set, struct nlattr *tb[],
-		  enum ipset_adt adt, u32 *lineno, u32 flags)
+		  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	const struct bitmap_ipmac *map = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];

net/netfilter/ipset/ip_set_bitmap_port.c

@@ -231,7 +231,7 @@ bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
-		 enum ipset_adt adt, u32 *lineno, u32 flags)
+		 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	struct bitmap_port *map = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];

net/netfilter/ipset/ip_set_core.c

@@ -1158,17 +1158,18 @@ call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set,
 	struct nlattr *tb[], enum ipset_adt adt,
 	u32 flags, bool use_lineno)
 {
-	int ret, retried = 0;
+	int ret;
 	u32 lineno = 0;
-	bool eexist = flags & IPSET_FLAG_EXIST;
+	bool eexist = flags & IPSET_FLAG_EXIST, retried = false;
 
 	do {
 		write_lock_bh(&set->lock);
-		ret = set->variant->uadt(set, tb, adt, &lineno, flags);
+		ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried);
 		write_unlock_bh(&set->lock);
+		retried = true;
 	} while (ret == -EAGAIN &&
 		 set->variant->resize &&
-		 (ret = set->variant->resize(set, retried++)) == 0);
+		 (ret = set->variant->resize(set, retried)) == 0);
 
 	if (!ret || (ret == -IPSET_ERR_EXIST && eexist))
 		return 0;
@@ -1341,7 +1342,7 @@ ip_set_utest(struct sock *ctnl, struct sk_buff *skb,
 		return -IPSET_ERR_PROTOCOL;
 
 	read_lock_bh(&set->lock);
-	ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0);
+	ret = set->variant->uadt(set, tb, IPSET_TEST, NULL, 0, 0);
 	read_unlock_bh(&set->lock);
 	/* Userspace can't trigger element to be re-added */
 	if (ret == -EAGAIN)

net/netfilter/ipset/ip_set_hash_ip.c

@@ -108,6 +108,12 @@ hash_ip4_data_tlist(struct sk_buff *skb, const struct hash_ip4_elem *data)
 #define HOST_MASK	32
 #include <linux/netfilter/ipset/ip_set_ahash.h>
 
+static inline void
+hash_ip4_data_next(struct ip_set_hash *h, const struct hash_ip4_elem *d)
+{
+	h->next.ip = ntohl(d->ip);
+}
+
 static int
 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
 	      enum ipset_adt adt, const struct ip_set_adt_opt *opt)
@@ -126,7 +132,7 @@ hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
-	      enum ipset_adt adt, u32 *lineno, u32 flags)
+	      enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	const struct ip_set_hash *h = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];
@@ -178,6 +184,8 @@ hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
 
 	hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
 
+	if (retried)
+		ip = h->next.ip;
 	for (; !before(ip_to, ip); ip += hosts) {
 		nip = htonl(ip);
 		if (nip == 0)
@@ -281,6 +289,11 @@ hash_ip6_data_tlist(struct sk_buff *skb, const struct hash_ip6_elem *data)
 #define HOST_MASK	128
 #include <linux/netfilter/ipset/ip_set_ahash.h>
 
+static inline void
+hash_ip6_data_next(struct ip_set_hash *h, const struct hash_ip6_elem *d)
+{
+}
+
 static int
 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 	      enum ipset_adt adt, const struct ip_set_adt_opt *opt)
@@ -305,7 +318,7 @@ static const struct nla_policy hash_ip6_adt_policy[IPSET_ATTR_ADT_MAX + 1] = {
 
 static int
 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
-	      enum ipset_adt adt, u32 *lineno, u32 flags)
+	      enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	const struct ip_set_hash *h = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];

net/netfilter/ipset/ip_set_hash_ipport.c

@@ -124,6 +124,14 @@ hash_ipport4_data_tlist(struct sk_buff *skb,
 #define HOST_MASK	32
 #include <linux/netfilter/ipset/ip_set_ahash.h>
 
+static inline void
+hash_ipport4_data_next(struct ip_set_hash *h,
+		       const struct hash_ipport4_elem *d)
+{
+	h->next.ip = ntohl(d->ip);
+	h->next.port = ntohs(d->port);
+}
+
 static int
 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 		  enum ipset_adt adt, const struct ip_set_adt_opt *opt)
@@ -143,12 +151,12 @@ hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
-		  enum ipset_adt adt, u32 *lineno, u32 flags)
+		  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	const struct ip_set_hash *h = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];
 	struct hash_ipport4_elem data = { };
-	u32 ip, ip_to, p, port, port_to;
+	u32 ip, ip_to, p = 0, port, port_to;
 	u32 timeout = h->timeout;
 	bool with_ports = false;
 	int ret;
@@ -220,8 +228,11 @@ hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
 			swap(port, port_to);
 	}
 
-	for (; !before(ip_to, ip); ip++)
-		for (p = port; p <= port_to; p++) {
+	if (retried)
+		ip = h->next.ip;
+	for (; !before(ip_to, ip); ip++) {
+		p = retried && ip == h->next.ip ? h->next.port : port;
+		for (; p <= port_to; p++) {
 			data.ip = htonl(ip);
 			data.port = htons(p);
 			ret = adtfn(set, &data, timeout, flags);
@@ -231,6 +242,7 @@ hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
 			else
 				ret = 0;
 		}
+	}
 	return ret;
 }
 
@@ -328,6 +340,13 @@ hash_ipport6_data_tlist(struct sk_buff *skb,
 #define HOST_MASK	128
 #include <linux/netfilter/ipset/ip_set_ahash.h>
 
+static inline void
+hash_ipport6_data_next(struct ip_set_hash *h,
+		       const struct hash_ipport6_elem *d)
+{
+	h->next.port = ntohs(d->port);
+}
+
 static int
 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 		  enum ipset_adt adt, const struct ip_set_adt_opt *opt)
@@ -347,7 +366,7 @@ hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
-		  enum ipset_adt adt, u32 *lineno, u32 flags)
+		  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	const struct ip_set_hash *h = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];
@@ -405,6 +424,8 @@ hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
 	if (port > port_to)
 		swap(port, port_to);
 
+	if (retried)
+		port = h->next.port;
 	for (; port <= port_to; port++) {
 		data.port = htons(port);
 		ret = adtfn(set, &data, timeout, flags);

net/netfilter/ipset/ip_set_hash_ipportip.c

@@ -127,6 +127,14 @@ hash_ipportip4_data_tlist(struct sk_buff *skb,
 #define HOST_MASK	32
 #include <linux/netfilter/ipset/ip_set_ahash.h>
 
+static inline void
+hash_ipportip4_data_next(struct ip_set_hash *h,
+			 const struct hash_ipportip4_elem *d)
+{
+	h->next.ip = ntohl(d->ip);
+	h->next.port = ntohs(d->port);
+}
+
 static int
 hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
 		    enum ipset_adt adt, const struct ip_set_adt_opt *opt)
@@ -147,12 +155,12 @@ hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
-		    enum ipset_adt adt, u32 *lineno, u32 flags)
+		    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	const struct ip_set_hash *h = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];
 	struct hash_ipportip4_elem data = { };
-	u32 ip, ip_to, p, port, port_to;
+	u32 ip, ip_to, p = 0, port, port_to;
 	u32 timeout = h->timeout;
 	bool with_ports = false;
 	int ret;
@@ -228,8 +236,11 @@ hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
 			swap(port, port_to);
 	}
 
-	for (; !before(ip_to, ip); ip++)
-		for (p = port; p <= port_to; p++) {
+	if (retried)
+		ip = h->next.ip;
+	for (; !before(ip_to, ip); ip++) {
+		p = retried && ip == h->next.ip ? h->next.port : port;
+		for (; p <= port_to; p++) {
 			data.ip = htonl(ip);
 			data.port = htons(p);
 			ret = adtfn(set, &data, timeout, flags);
@@ -239,6 +250,7 @@ hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
 			else
 				ret = 0;
 		}
+	}
 	return ret;
 }
 
@@ -341,6 +353,13 @@ hash_ipportip6_data_tlist(struct sk_buff *skb,
 #define HOST_MASK	128
 #include <linux/netfilter/ipset/ip_set_ahash.h>
 
+static inline void
+hash_ipportip6_data_next(struct ip_set_hash *h,
+			 const struct hash_ipportip6_elem *d)
+{
+	h->next.port = ntohs(d->port);
+}
+
 static int
 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 		    enum ipset_adt adt, const struct ip_set_adt_opt *opt)
@@ -361,7 +380,7 @@ hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
 
 static int
 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
-		    enum ipset_adt adt, u32 *lineno, u32 flags)
+		    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 {
 	const struct ip_set_hash *h = set->data;
 	ipset_adtfn adtfn = set->variant->adt[adt];
@@ -423,6 +442,8 @@ hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
 	if (port > port_to)
 		swap(port, port_to);
 
+	if (retried)
+		port = h->next.port;
 	for (; port <= port_to; port++) {
 		data.port = htons(port);
 		ret = adtfn(set, &data, timeout, flags);