netfilter: ipset: Support to match elements marked with "nomatch"

Exceptions can now be matched and we can branch according to the
possible cases:

a. match in the set if the element is not flagged as "nomatch"
b. match in the set if the element is flagged with "nomatch"
c. no match

i.e.

iptables ... -m set --match-set ... -j ...
iptables ... -m set --match-set ... --nomatch-entries -j ...
...

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

diff --git a/include/linux/netfilter/ipset/ip_set.h b/include/linux/netfilter/ipset/ip_set.h
index 0c1e97b3acfbb17fe9bbb4a1edf28da466afeeca..528697b3c1524d1e7e071986231e2d14979018c2 100644 (file)
--- a/include/linux/netfilter/ipset/ip_set.h
+++ b/include/linux/netfilter/ipset/ip_set.h
@@ -190,6 +190,7 @@ enum ip_set_dim {
         * If changed, new revision of iptables match/target is required.
         */
        IPSET_DIM_MAX = 6,
+       IPSET_BIT_RETURN_NOMATCH = 7,
 };
 
 /* Option flags for kernel operations */
@@ -198,6 +199,7 @@ enum ip_set_kopt {
        IPSET_DIM_ONE_SRC = (1 << IPSET_DIM_ONE),
        IPSET_DIM_TWO_SRC = (1 << IPSET_DIM_TWO),
        IPSET_DIM_THREE_SRC = (1 << IPSET_DIM_THREE),
+       IPSET_RETURN_NOMATCH = (1 << IPSET_BIT_RETURN_NOMATCH),
 };
 
 #ifdef __KERNEL__
@@ -229,6 +231,8 @@ enum ip_set_feature {
        IPSET_TYPE_NAME = (1 << IPSET_TYPE_NAME_FLAG),
        IPSET_TYPE_IFACE_FLAG = 5,
        IPSET_TYPE_IFACE = (1 << IPSET_TYPE_IFACE_FLAG),
+       IPSET_TYPE_NOMATCH_FLAG = 6,
+       IPSET_TYPE_NOMATCH = (1 << IPSET_TYPE_NOMATCH_FLAG),
        /* Strictly speaking not a feature, but a flag for dumping:
         * this settype must be dumped last */
        IPSET_DUMP_LAST_FLAG = 7,

diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 72e9bf0ef90d73c32a043cf74280b4e97136f298..778465f217fa975c39af6fb3d7429214dbfe2a51 100644 (file)
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -370,6 +370,12 @@ ip_set_test(ip_set_id_t index, const struct sk_buff *skb,
                set->variant->kadt(set, skb, par, IPSET_ADD, opt);
                write_unlock_bh(&set->lock);
                ret = 1;
+       } else {
+               /* --return-nomatch: invert matched element */
+               if ((opt->flags & IPSET_RETURN_NOMATCH) &&
+                   (set->type->features & IPSET_TYPE_NOMATCH) &&
+                   (ret > 0 || ret == -ENOTEMPTY))
+                       ret = -ret;
        }
 
        /* Convert error codes to nomatch */

diff --git a/net/netfilter/ipset/ip_set_hash_ipportnet.c b/net/netfilter/ipset/ip_set_hash_ipportnet.c
index 8ee916875a238edde0b457208b7c93eee8ac0bb4..cb71f9a774e7d50d67998aaaadc199a563f43f40 100644 (file)
--- a/net/netfilter/ipset/ip_set_hash_ipportnet.c
+++ b/net/netfilter/ipset/ip_set_hash_ipportnet.c
@@ -104,10 +104,10 @@ hash_ipportnet4_data_flags(struct hash_ipportnet4_elem *dst, u32 flags)
        dst->nomatch = !!(flags & IPSET_FLAG_NOMATCH);
 }
 
-static inline bool
+static inline int
 hash_ipportnet4_data_match(const struct hash_ipportnet4_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -411,10 +411,10 @@ hash_ipportnet6_data_flags(struct hash_ipportnet6_elem *dst, u32 flags)
        dst->nomatch = !!(flags & IPSET_FLAG_NOMATCH);
 }
 
-static inline bool
+static inline int
 hash_ipportnet6_data_match(const struct hash_ipportnet6_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -697,7 +697,8 @@ hash_ipportnet_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 static struct ip_set_type hash_ipportnet_type __read_mostly = {
        .name           = "hash:ip,port,net",
        .protocol       = IPSET_PROTOCOL,
-       .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
+       .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2 |
+                         IPSET_TYPE_NOMATCH,
        .dimension      = IPSET_DIM_THREE,
        .family         = NFPROTO_UNSPEC,
        .revision_min   = REVISION_MIN,

diff --git a/net/netfilter/ipset/ip_set_hash_net.c b/net/netfilter/ipset/ip_set_hash_net.c
index 014ff7272f7b58f027a7d02bb9ab0d9199b3628a..29e94b981f3f3fe4853a9683a1cbecdfc9d7ec42 100644 (file)
--- a/net/netfilter/ipset/ip_set_hash_net.c
+++ b/net/netfilter/ipset/ip_set_hash_net.c
@@ -90,10 +90,10 @@ hash_net4_data_flags(struct hash_net4_elem *dst, u32 flags)
        dst->nomatch = flags & IPSET_FLAG_NOMATCH;
 }
 
-static inline bool
+static inline int
 hash_net4_data_match(const struct hash_net4_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -311,10 +311,10 @@ hash_net6_data_flags(struct hash_net6_elem *dst, u32 flags)
        dst->nomatch = flags & IPSET_FLAG_NOMATCH;
 }
 
-static inline bool
+static inline int
 hash_net6_data_match(const struct hash_net6_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -536,7 +536,7 @@ hash_net_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 static struct ip_set_type hash_net_type __read_mostly = {
        .name           = "hash:net",
        .protocol       = IPSET_PROTOCOL,
-       .features       = IPSET_TYPE_IP,
+       .features       = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
        .dimension      = IPSET_DIM_ONE,
        .family         = NFPROTO_UNSPEC,
        .revision_min   = REVISION_MIN,

diff --git a/net/netfilter/ipset/ip_set_hash_netiface.c b/net/netfilter/ipset/ip_set_hash_netiface.c
index a5c8491d265e6b92fd3ec868291b015741f08a95..b9a63381e34998e08ab5271f7d82cca9058a76d8 100644 (file)
--- a/net/netfilter/ipset/ip_set_hash_netiface.c
+++ b/net/netfilter/ipset/ip_set_hash_netiface.c
@@ -201,10 +201,10 @@ hash_netiface4_data_flags(struct hash_netiface4_elem *dst, u32 flags)
        dst->nomatch = flags & IPSET_FLAG_NOMATCH;
 }
 
-static inline bool
+static inline int
 hash_netiface4_data_match(const struct hash_netiface4_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -497,10 +497,10 @@ hash_netiface6_data_flags(struct hash_netiface6_elem *dst, u32 flags)
        dst->nomatch = flags & IPSET_FLAG_NOMATCH;
 }
 
-static inline bool
+static inline int
 hash_netiface6_data_match(const struct hash_netiface6_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -774,7 +774,8 @@ hash_netiface_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 static struct ip_set_type hash_netiface_type __read_mostly = {
        .name           = "hash:net,iface",
        .protocol       = IPSET_PROTOCOL,
-       .features       = IPSET_TYPE_IP | IPSET_TYPE_IFACE,
+       .features       = IPSET_TYPE_IP | IPSET_TYPE_IFACE |
+                         IPSET_TYPE_NOMATCH,
        .dimension      = IPSET_DIM_TWO,
        .family         = NFPROTO_UNSPEC,
        .revision_min   = REVISION_MIN,

diff --git a/net/netfilter/ipset/ip_set_hash_netport.c b/net/netfilter/ipset/ip_set_hash_netport.c
index 7ca357a62b1c650e2745ae8b5713bf38708b1b7f..7ef700de596c54d09f8873a4498da207bfd5a828 100644 (file)
--- a/net/netfilter/ipset/ip_set_hash_netport.c
+++ b/net/netfilter/ipset/ip_set_hash_netport.c
@@ -104,10 +104,10 @@ hash_netport4_data_flags(struct hash_netport4_elem *dst, u32 flags)
        dst->nomatch = !!(flags & IPSET_FLAG_NOMATCH);
 }
 
-static inline bool
+static inline int
 hash_netport4_data_match(const struct hash_netport4_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -375,10 +375,10 @@ hash_netport6_data_flags(struct hash_netport6_elem *dst, u32 flags)
        dst->nomatch = !!(flags & IPSET_FLAG_NOMATCH);
 }
 
-static inline bool
+static inline int
 hash_netport6_data_match(const struct hash_netport6_elem *elem)
 {
-       return !elem->nomatch;
+       return elem->nomatch ? -ENOTEMPTY : 1;
 }
 
 static inline void
@@ -650,7 +650,7 @@ hash_netport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 static struct ip_set_type hash_netport_type __read_mostly = {
        .name           = "hash:net,port",
        .protocol       = IPSET_PROTOCOL,
-       .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
+       .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH,
        .dimension      = IPSET_DIM_TWO,
        .family         = NFPROTO_UNSPEC,
        .revision_min   = REVISION_MIN,

diff --git a/net/netfilter/xt_set.c b/net/netfilter/xt_set.c
index c6f7db720d84f4650e975a952054c04d15868fc3..865a9e54f3ad85477e8b3d5dc481f1ea444fe978 100644 (file)
--- a/net/netfilter/xt_set.c
+++ b/net/netfilter/xt_set.c
@@ -356,6 +356,27 @@ static struct xt_match set_matches[] __read_mostly = {
                .destroy        = set_match_v1_destroy,
                .me             = THIS_MODULE
        },
+       /* --return-nomatch flag support */
+       {
+               .name           = "set",
+               .family         = NFPROTO_IPV4,
+               .revision       = 2,
+               .match          = set_match_v1,
+               .matchsize      = sizeof(struct xt_set_info_match_v1),
+               .checkentry     = set_match_v1_checkentry,
+               .destroy        = set_match_v1_destroy,
+               .me             = THIS_MODULE
+       },
+       {
+               .name           = "set",
+               .family         = NFPROTO_IPV6,
+               .revision       = 2,
+               .match          = set_match_v1,
+               .matchsize      = sizeof(struct xt_set_info_match_v1),
+               .checkentry     = set_match_v1_checkentry,
+               .destroy        = set_match_v1_destroy,
+               .me             = THIS_MODULE
+       },
 };
 
 static struct xt_target set_targets[] __read_mostly = {
@@ -389,6 +410,7 @@ static struct xt_target set_targets[] __read_mostly = {
                .destroy        = set_target_v1_destroy,
                .me             = THIS_MODULE
        },
+       /* --timeout and --exist flags support */
        {
                .name           = "SET",
                .revision       = 2,