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netfilter: ipset: set match: add support to match the counters
The new revision of the set match supports to match the counters and to suppress updating the counters at matching too. At the set:list types, the updating of the subcounters can be suppressed as well. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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@ -76,7 +76,7 @@ struct ip_set;
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typedef int (*ipset_adtfn)(struct ip_set *set, void *value,
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const struct ip_set_ext *ext,
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struct ip_set_ext *mext, u32 flags);
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struct ip_set_ext *mext, u32 cmdflags);
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/* Kernel API function options */
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struct ip_set_adt_opt {
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@ -217,10 +217,15 @@ ip_set_update_counter(struct ip_set_counter *counter,
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const struct ip_set_ext *ext,
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struct ip_set_ext *mext, u32 flags)
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{
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if (ext->packets != ULLONG_MAX) {
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if (ext->packets != ULLONG_MAX &&
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!(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) {
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ip_set_add_bytes(ext->bytes, counter);
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ip_set_add_packets(ext->packets, counter);
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}
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if (flags & IPSET_FLAG_MATCH_COUNTERS) {
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mext->packets = ip_set_get_packets(counter);
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mext->bytes = ip_set_get_bytes(counter);
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}
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}
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static inline bool
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@ -145,7 +145,7 @@ enum ipset_errno {
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IPSET_ERR_TYPE_SPECIFIC = 4352,
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};
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/* Flags at command level */
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/* Flags at command level or match/target flags, lower half of cmdattrs*/
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enum ipset_cmd_flags {
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IPSET_FLAG_BIT_EXIST = 0,
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IPSET_FLAG_EXIST = (1 << IPSET_FLAG_BIT_EXIST),
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@ -153,10 +153,20 @@ enum ipset_cmd_flags {
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IPSET_FLAG_LIST_SETNAME = (1 << IPSET_FLAG_BIT_LIST_SETNAME),
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IPSET_FLAG_BIT_LIST_HEADER = 2,
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IPSET_FLAG_LIST_HEADER = (1 << IPSET_FLAG_BIT_LIST_HEADER),
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IPSET_FLAG_CMD_MAX = 15, /* Lower half */
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IPSET_FLAG_BIT_SKIP_COUNTER_UPDATE = 3,
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IPSET_FLAG_SKIP_COUNTER_UPDATE =
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(1 << IPSET_FLAG_BIT_SKIP_COUNTER_UPDATE),
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IPSET_FLAG_BIT_SKIP_SUBCOUNTER_UPDATE = 4,
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IPSET_FLAG_SKIP_SUBCOUNTER_UPDATE =
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(1 << IPSET_FLAG_BIT_SKIP_SUBCOUNTER_UPDATE),
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IPSET_FLAG_BIT_MATCH_COUNTERS = 5,
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IPSET_FLAG_MATCH_COUNTERS = (1 << IPSET_FLAG_BIT_MATCH_COUNTERS),
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IPSET_FLAG_BIT_RETURN_NOMATCH = 7,
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IPSET_FLAG_RETURN_NOMATCH = (1 << IPSET_FLAG_BIT_RETURN_NOMATCH),
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IPSET_FLAG_CMD_MAX = 15,
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};
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/* Flags at CADT attribute level */
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/* Flags at CADT attribute level, upper half of cmdattrs */
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enum ipset_cadt_flags {
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IPSET_FLAG_BIT_BEFORE = 0,
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IPSET_FLAG_BEFORE = (1 << IPSET_FLAG_BIT_BEFORE),
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@ -166,7 +176,7 @@ enum ipset_cadt_flags {
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IPSET_FLAG_NOMATCH = (1 << IPSET_FLAG_BIT_NOMATCH),
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IPSET_FLAG_BIT_WITH_COUNTERS = 3,
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IPSET_FLAG_WITH_COUNTERS = (1 << IPSET_FLAG_BIT_WITH_COUNTERS),
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IPSET_FLAG_CADT_MAX = 15, /* Upper half */
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IPSET_FLAG_CADT_MAX = 15,
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};
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/* Commands with settype-specific attributes */
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@ -195,6 +205,7 @@ enum ip_set_dim {
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* If changed, new revision of iptables match/target is required.
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*/
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IPSET_DIM_MAX = 6,
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/* Backward compatibility: set match revision 2 */
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IPSET_BIT_RETURN_NOMATCH = 7,
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};
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@ -207,6 +218,18 @@ enum ip_set_kopt {
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IPSET_RETURN_NOMATCH = (1 << IPSET_BIT_RETURN_NOMATCH),
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};
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enum {
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IPSET_COUNTER_NONE = 0,
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IPSET_COUNTER_EQ,
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IPSET_COUNTER_NE,
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IPSET_COUNTER_LT,
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IPSET_COUNTER_GT,
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};
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struct ip_set_counter_match {
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__u8 op;
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__u64 value;
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};
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/* Interface to iptables/ip6tables */
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@ -62,4 +62,13 @@ struct xt_set_info_target_v2 {
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__u32 timeout;
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};
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/* Revision 3 match */
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struct xt_set_info_match_v3 {
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struct xt_set_info match_set;
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struct ip_set_counter_match packets;
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struct ip_set_counter_match bytes;
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__u32 flags;
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};
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#endif /*_XT_SET_H*/
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@ -413,7 +413,7 @@ ip_set_test(ip_set_id_t index, const struct sk_buff *skb,
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ret = 1;
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} else {
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/* --return-nomatch: invert matched element */
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if ((opt->flags & IPSET_RETURN_NOMATCH) &&
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if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) &&
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(set->type->features & IPSET_TYPE_NOMATCH) &&
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(ret > 0 || ret == -ENOTEMPTY))
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ret = -ret;
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@ -84,9 +84,13 @@ list_set_ktest(struct ip_set *set, const struct sk_buff *skb,
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{
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struct list_set *map = set->data;
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struct set_elem *e;
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u32 i;
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u32 i, cmdflags = opt->cmdflags;
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int ret;
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/* Don't lookup sub-counters at all */
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opt->cmdflags &= ~IPSET_FLAG_MATCH_COUNTERS;
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if (opt->cmdflags & IPSET_FLAG_SKIP_SUBCOUNTER_UPDATE)
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opt->cmdflags &= ~IPSET_FLAG_SKIP_COUNTER_UPDATE;
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for (i = 0; i < map->size; i++) {
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e = list_set_elem(map, i);
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if (e->id == IPSET_INVALID_ID)
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@ -99,7 +103,7 @@ list_set_ktest(struct ip_set *set, const struct sk_buff *skb,
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if (SET_WITH_COUNTER(set))
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ip_set_update_counter(ext_counter(e, map),
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ext, &opt->ext,
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opt->cmdflags);
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cmdflags);
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return ret;
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}
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}
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@ -189,6 +189,9 @@ set_match_v1(const struct sk_buff *skb, struct xt_action_param *par)
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ADT_OPT(opt, par->family, info->match_set.dim,
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info->match_set.flags, 0, UINT_MAX);
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if (opt.flags & IPSET_RETURN_NOMATCH)
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opt.cmdflags |= IPSET_FLAG_RETURN_NOMATCH;
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return match_set(info->match_set.index, skb, par, &opt,
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info->match_set.flags & IPSET_INV_MATCH);
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}
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@ -317,6 +320,52 @@ set_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
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#define set_target_v2_checkentry set_target_v1_checkentry
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#define set_target_v2_destroy set_target_v1_destroy
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/* Revision 3 match */
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static bool
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match_counter(u64 counter, const struct ip_set_counter_match *info)
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{
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switch (info->op) {
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case IPSET_COUNTER_NONE:
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return true;
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case IPSET_COUNTER_EQ:
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return counter == info->value;
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case IPSET_COUNTER_NE:
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return counter != info->value;
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case IPSET_COUNTER_LT:
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return counter < info->value;
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case IPSET_COUNTER_GT:
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return counter > info->value;
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}
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return false;
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}
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static bool
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set_match_v3(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_set_info_match_v3 *info = par->matchinfo;
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ADT_OPT(opt, par->family, info->match_set.dim,
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info->match_set.flags, info->flags, UINT_MAX);
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int ret;
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if (info->packets.op != IPSET_COUNTER_NONE ||
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info->bytes.op != IPSET_COUNTER_NONE)
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opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;
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ret = match_set(info->match_set.index, skb, par, &opt,
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info->match_set.flags & IPSET_INV_MATCH);
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if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
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return ret;
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if (!match_counter(opt.ext.packets, &info->packets))
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return 0;
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return match_counter(opt.ext.bytes, &info->bytes);
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}
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#define set_match_v3_checkentry set_match_v1_checkentry
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#define set_match_v3_destroy set_match_v1_destroy
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static struct xt_match set_matches[] __read_mostly = {
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{
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.name = "set",
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@ -369,6 +418,27 @@ static struct xt_match set_matches[] __read_mostly = {
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.destroy = set_match_v1_destroy,
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.me = THIS_MODULE
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},
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/* counters support: update, match */
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{
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.name = "set",
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.family = NFPROTO_IPV4,
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.revision = 3,
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.match = set_match_v3,
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.matchsize = sizeof(struct xt_set_info_match_v3),
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.checkentry = set_match_v3_checkentry,
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.destroy = set_match_v3_destroy,
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.me = THIS_MODULE
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},
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{
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.name = "set",
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.family = NFPROTO_IPV6,
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.revision = 3,
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.match = set_match_v3,
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.matchsize = sizeof(struct xt_set_info_match_v3),
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.checkentry = set_match_v3_checkentry,
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.destroy = set_match_v3_destroy,
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.me = THIS_MODULE
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},
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};
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static struct xt_target set_targets[] __read_mostly = {
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