netfilter: ipset: Add /0 network support to hash:net,iface type

Now it is possible to setup a single hash:net,iface type of set and
a single ip6?tables match which covers all egress/ingress filtering.

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

diff --git a/net/netfilter/ipset/ip_set_hash_netiface.c b/net/netfilter/ipset/ip_set_hash_netiface.c
index 632693f0beeb7fb60cf467fcd5cf383ae33c6c40..e7c671dd3cce8de5a31ba9b954e81d2088455a7f 100644 (file)
--- a/net/netfilter/ipset/ip_set_hash_netiface.c
+++ b/net/netfilter/ipset/ip_set_hash_netiface.c
@@ -140,7 +140,7 @@ struct hash_netiface4_elem_hashed {
        u8 physdev;
        u8 cidr;
        u8 nomatch;
-       u8 padding;
+       u8 elem;
 };
 
 #define HKEY_DATALEN   sizeof(struct hash_netiface4_elem_hashed)
@@ -151,7 +151,7 @@ struct hash_netiface4_elem {
        u8 physdev;
        u8 cidr;
        u8 nomatch;
-       u8 padding;
+       u8 elem;
        const char *iface;
 };
 
@@ -161,7 +161,7 @@ struct hash_netiface4_telem {
        u8 physdev;
        u8 cidr;
        u8 nomatch;
-       u8 padding;
+       u8 elem;
        const char *iface;
        unsigned long timeout;
 };
@@ -181,18 +181,14 @@ hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
 static inline bool
 hash_netiface4_data_isnull(const struct hash_netiface4_elem *elem)
 {
-       return elem->cidr == 0;
+       return elem->elem == 0;
 }
 
 static inline void
 hash_netiface4_data_copy(struct hash_netiface4_elem *dst,
                         const struct hash_netiface4_elem *src)
 {
-       dst->ip = src->ip;
-       dst->cidr = src->cidr;
-       dst->physdev = src->physdev;
-       dst->iface = src->iface;
-       dst->nomatch = src->nomatch;
+       memcpy(dst, src, sizeof(*dst));
 }
 
 static inline void
@@ -217,7 +213,7 @@ hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr)
 static inline void
 hash_netiface4_data_zero_out(struct hash_netiface4_elem *elem)
 {
-       elem->cidr = 0;
+       elem->elem = 0;
 }
 
 static bool
@@ -288,7 +284,8 @@ hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb,
        struct ip_set_hash *h = set->data;
        ipset_adtfn adtfn = set->variant->adt[adt];
        struct hash_netiface4_elem data = {
-               .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
+               .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK,
+               .elem = 1,
        };
        int ret;
 
@@ -339,7 +336,7 @@ hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
 {
        struct ip_set_hash *h = set->data;
        ipset_adtfn adtfn = set->variant->adt[adt];
-       struct hash_netiface4_elem data = { .cidr = HOST_MASK };
+       struct hash_netiface4_elem data = { .cidr = HOST_MASK, .elem = 1 };
        u32 ip = 0, ip_to, last;
        u32 timeout = h->timeout;
        char iface[IFNAMSIZ];
@@ -360,7 +357,7 @@ hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
 
        if (tb[IPSET_ATTR_CIDR]) {
                data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
-               if (!data.cidr || data.cidr > HOST_MASK)
+               if (data.cidr > HOST_MASK)
                        return -IPSET_ERR_INVALID_CIDR;
        }
 
@@ -389,7 +386,6 @@ hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
                if (adt == IPSET_ADD && (cadt_flags & IPSET_FLAG_NOMATCH))
                        flags |= (cadt_flags << 16);
        }
-
        if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
                data.ip = htonl(ip & ip_set_hostmask(data.cidr));
                ret = adtfn(set, &data, timeout, flags);
@@ -442,7 +438,7 @@ struct hash_netiface6_elem_hashed {
        u8 physdev;
        u8 cidr;
        u8 nomatch;
-       u8 padding;
+       u8 elem;
 };
 
 #define HKEY_DATALEN   sizeof(struct hash_netiface6_elem_hashed)
@@ -452,7 +448,7 @@ struct hash_netiface6_elem {
        u8 physdev;
        u8 cidr;
        u8 nomatch;
-       u8 padding;
+       u8 elem;
        const char *iface;
 };
 
@@ -461,7 +457,7 @@ struct hash_netiface6_telem {
        u8 physdev;
        u8 cidr;
        u8 nomatch;
-       u8 padding;
+       u8 elem;
        const char *iface;
        unsigned long timeout;
 };
@@ -481,7 +477,7 @@ hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
 static inline bool
 hash_netiface6_data_isnull(const struct hash_netiface6_elem *elem)
 {
-       return elem->cidr == 0;
+       return elem->elem == 0;
 }
 
 static inline void
@@ -506,7 +502,7 @@ hash_netiface6_data_match(const struct hash_netiface6_elem *elem)
 static inline void
 hash_netiface6_data_zero_out(struct hash_netiface6_elem *elem)
 {
-       elem->cidr = 0;
+       elem->elem = 0;
 }
 
 static inline void
@@ -590,7 +586,8 @@ hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb,
        struct ip_set_hash *h = set->data;
        ipset_adtfn adtfn = set->variant->adt[adt];
        struct hash_netiface6_elem data = {
-               .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK
+               .cidr = h->nets[0].cidr ? h->nets[0].cidr : HOST_MASK,
+               .elem = 1,
        };
        int ret;
 
@@ -637,7 +634,7 @@ hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
 {
        struct ip_set_hash *h = set->data;
        ipset_adtfn adtfn = set->variant->adt[adt];
-       struct hash_netiface6_elem data = { .cidr = HOST_MASK };
+       struct hash_netiface6_elem data = { .cidr = HOST_MASK, .elem = 1 };
        u32 timeout = h->timeout;
        char iface[IFNAMSIZ];
        int ret;
@@ -659,7 +656,7 @@ hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
 
        if (tb[IPSET_ATTR_CIDR])
                data.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
-       if (!data.cidr || data.cidr > HOST_MASK)
+       if (data.cidr > HOST_MASK)
                return -IPSET_ERR_INVALID_CIDR;
        ip6_netmask(&data.ip, data.cidr);
 
@@ -777,7 +774,8 @@ static struct ip_set_type hash_netiface_type __read_mostly = {
        .dimension      = IPSET_DIM_TWO,
        .family         = NFPROTO_UNSPEC,
        .revision_min   = 0,
-       .revision_max   = 1,    /* nomatch flag support added */
+       /*              = 1,       nomatch flag support added */
+       .revision_max   = 2,    /* /0 support added */
        .create         = hash_netiface_create,
        .create_policy  = {
                [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },