| /* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| /* Kernel module implementing an IP set type: the bitmap:port type */ |
| |
| #include <linux/module.h> |
| #include <linux/ip.h> |
| #include <linux/skbuff.h> |
| #include <linux/errno.h> |
| #include <linux/netlink.h> |
| #include <linux/jiffies.h> |
| #include <linux/timer.h> |
| #include <net/netlink.h> |
| |
| #include <linux/netfilter/ipset/ip_set.h> |
| #include <linux/netfilter/ipset/ip_set_bitmap.h> |
| #include <linux/netfilter/ipset/ip_set_getport.h> |
| #define IP_SET_BITMAP_TIMEOUT |
| #include <linux/netfilter/ipset/ip_set_timeout.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
| MODULE_DESCRIPTION("bitmap:port type of IP sets"); |
| MODULE_ALIAS("ip_set_bitmap:port"); |
| |
| /* Type structure */ |
| struct bitmap_port { |
| void *members; /* the set members */ |
| u16 first_port; /* host byte order, included in range */ |
| u16 last_port; /* host byte order, included in range */ |
| size_t memsize; /* members size */ |
| u32 timeout; /* timeout parameter */ |
| struct timer_list gc; /* garbage collection */ |
| }; |
| |
| /* Base variant */ |
| |
| static int |
| bitmap_port_test(struct ip_set *set, void *value, u32 timeout, u32 flags) |
| { |
| const struct bitmap_port *map = set->data; |
| u16 id = *(u16 *)value; |
| |
| return !!test_bit(id, map->members); |
| } |
| |
| static int |
| bitmap_port_add(struct ip_set *set, void *value, u32 timeout, u32 flags) |
| { |
| struct bitmap_port *map = set->data; |
| u16 id = *(u16 *)value; |
| |
| if (test_and_set_bit(id, map->members)) |
| return -IPSET_ERR_EXIST; |
| |
| return 0; |
| } |
| |
| static int |
| bitmap_port_del(struct ip_set *set, void *value, u32 timeout, u32 flags) |
| { |
| struct bitmap_port *map = set->data; |
| u16 id = *(u16 *)value; |
| |
| if (!test_and_clear_bit(id, map->members)) |
| return -IPSET_ERR_EXIST; |
| |
| return 0; |
| } |
| |
| static int |
| bitmap_port_list(const struct ip_set *set, |
| struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| const struct bitmap_port *map = set->data; |
| struct nlattr *atd, *nested; |
| u16 id, first = cb->args[2]; |
| u16 last = map->last_port - map->first_port; |
| |
| atd = ipset_nest_start(skb, IPSET_ATTR_ADT); |
| if (!atd) |
| return -EMSGSIZE; |
| for (; cb->args[2] <= last; cb->args[2]++) { |
| id = cb->args[2]; |
| if (!test_bit(id, map->members)) |
| continue; |
| nested = ipset_nest_start(skb, IPSET_ATTR_DATA); |
| if (!nested) { |
| if (id == first) { |
| nla_nest_cancel(skb, atd); |
| return -EMSGSIZE; |
| } else |
| goto nla_put_failure; |
| } |
| NLA_PUT_NET16(skb, IPSET_ATTR_PORT, |
| htons(map->first_port + id)); |
| ipset_nest_end(skb, nested); |
| } |
| ipset_nest_end(skb, atd); |
| /* Set listing finished */ |
| cb->args[2] = 0; |
| |
| return 0; |
| |
| nla_put_failure: |
| nla_nest_cancel(skb, nested); |
| ipset_nest_end(skb, atd); |
| if (unlikely(id == first)) { |
| cb->args[2] = 0; |
| return -EMSGSIZE; |
| } |
| return 0; |
| } |
| |
| /* Timeout variant */ |
| |
| static int |
| bitmap_port_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags) |
| { |
| const struct bitmap_port *map = set->data; |
| const unsigned long *members = map->members; |
| u16 id = *(u16 *)value; |
| |
| return ip_set_timeout_test(members[id]); |
| } |
| |
| static int |
| bitmap_port_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags) |
| { |
| struct bitmap_port *map = set->data; |
| unsigned long *members = map->members; |
| u16 id = *(u16 *)value; |
| |
| if (ip_set_timeout_test(members[id]) && !(flags & IPSET_FLAG_EXIST)) |
| return -IPSET_ERR_EXIST; |
| |
| members[id] = ip_set_timeout_set(timeout); |
| |
| return 0; |
| } |
| |
| static int |
| bitmap_port_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags) |
| { |
| struct bitmap_port *map = set->data; |
| unsigned long *members = map->members; |
| u16 id = *(u16 *)value; |
| int ret = -IPSET_ERR_EXIST; |
| |
| if (ip_set_timeout_test(members[id])) |
| ret = 0; |
| |
| members[id] = IPSET_ELEM_UNSET; |
| return ret; |
| } |
| |
| static int |
| bitmap_port_tlist(const struct ip_set *set, |
| struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| const struct bitmap_port *map = set->data; |
| struct nlattr *adt, *nested; |
| u16 id, first = cb->args[2]; |
| u16 last = map->last_port - map->first_port; |
| const unsigned long *members = map->members; |
| |
| adt = ipset_nest_start(skb, IPSET_ATTR_ADT); |
| if (!adt) |
| return -EMSGSIZE; |
| for (; cb->args[2] <= last; cb->args[2]++) { |
| id = cb->args[2]; |
| if (!ip_set_timeout_test(members[id])) |
| continue; |
| nested = ipset_nest_start(skb, IPSET_ATTR_DATA); |
| if (!nested) { |
| if (id == first) { |
| nla_nest_cancel(skb, adt); |
| return -EMSGSIZE; |
| } else |
| goto nla_put_failure; |
| } |
| NLA_PUT_NET16(skb, IPSET_ATTR_PORT, |
| htons(map->first_port + id)); |
| NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, |
| htonl(ip_set_timeout_get(members[id]))); |
| ipset_nest_end(skb, nested); |
| } |
| ipset_nest_end(skb, adt); |
| |
| /* Set listing finished */ |
| cb->args[2] = 0; |
| |
| return 0; |
| |
| nla_put_failure: |
| nla_nest_cancel(skb, nested); |
| ipset_nest_end(skb, adt); |
| if (unlikely(id == first)) { |
| cb->args[2] = 0; |
| return -EMSGSIZE; |
| } |
| return 0; |
| } |
| |
| static int |
| bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb, |
| const struct xt_action_param *par, |
| enum ipset_adt adt, const struct ip_set_adt_opt *opt) |
| { |
| struct bitmap_port *map = set->data; |
| ipset_adtfn adtfn = set->variant->adt[adt]; |
| __be16 __port; |
| u16 port = 0; |
| |
| if (!ip_set_get_ip_port(skb, opt->family, |
| opt->flags & IPSET_DIM_ONE_SRC, &__port)) |
| return -EINVAL; |
| |
| port = ntohs(__port); |
| |
| if (port < map->first_port || port > map->last_port) |
| return -IPSET_ERR_BITMAP_RANGE; |
| |
| port -= map->first_port; |
| |
| return adtfn(set, &port, opt_timeout(opt, map), opt->cmdflags); |
| } |
| |
| static int |
| bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[], |
| enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
| { |
| struct bitmap_port *map = set->data; |
| ipset_adtfn adtfn = set->variant->adt[adt]; |
| u32 timeout = map->timeout; |
| u32 port; /* wraparound */ |
| u16 id, port_to; |
| int ret = 0; |
| |
| if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || |
| !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || |
| !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT))) |
| return -IPSET_ERR_PROTOCOL; |
| |
| if (tb[IPSET_ATTR_LINENO]) |
| *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); |
| |
| port = ip_set_get_h16(tb[IPSET_ATTR_PORT]); |
| if (port < map->first_port || port > map->last_port) |
| return -IPSET_ERR_BITMAP_RANGE; |
| |
| if (tb[IPSET_ATTR_TIMEOUT]) { |
| if (!with_timeout(map->timeout)) |
| return -IPSET_ERR_TIMEOUT; |
| timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); |
| } |
| |
| if (adt == IPSET_TEST) { |
| id = port - map->first_port; |
| return adtfn(set, &id, timeout, flags); |
| } |
| |
| if (tb[IPSET_ATTR_PORT_TO]) { |
| port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); |
| if (port > port_to) { |
| swap(port, port_to); |
| if (port < map->first_port) |
| return -IPSET_ERR_BITMAP_RANGE; |
| } |
| } else |
| port_to = port; |
| |
| if (port_to > map->last_port) |
| return -IPSET_ERR_BITMAP_RANGE; |
| |
| for (; port <= port_to; port++) { |
| id = port - map->first_port; |
| ret = adtfn(set, &id, timeout, flags); |
| |
| if (ret && !ip_set_eexist(ret, flags)) |
| return ret; |
| else |
| ret = 0; |
| } |
| return ret; |
| } |
| |
| static void |
| bitmap_port_destroy(struct ip_set *set) |
| { |
| struct bitmap_port *map = set->data; |
| |
| if (with_timeout(map->timeout)) |
| del_timer_sync(&map->gc); |
| |
| ip_set_free(map->members); |
| kfree(map); |
| |
| set->data = NULL; |
| } |
| |
| static void |
| bitmap_port_flush(struct ip_set *set) |
| { |
| struct bitmap_port *map = set->data; |
| |
| memset(map->members, 0, map->memsize); |
| } |
| |
| static int |
| bitmap_port_head(struct ip_set *set, struct sk_buff *skb) |
| { |
| const struct bitmap_port *map = set->data; |
| struct nlattr *nested; |
| |
| nested = ipset_nest_start(skb, IPSET_ATTR_DATA); |
| if (!nested) |
| goto nla_put_failure; |
| NLA_PUT_NET16(skb, IPSET_ATTR_PORT, htons(map->first_port)); |
| NLA_PUT_NET16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port)); |
| NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1)); |
| NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE, |
| htonl(sizeof(*map) + map->memsize)); |
| if (with_timeout(map->timeout)) |
| NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout)); |
| ipset_nest_end(skb, nested); |
| |
| return 0; |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static bool |
| bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b) |
| { |
| const struct bitmap_port *x = a->data; |
| const struct bitmap_port *y = b->data; |
| |
| return x->first_port == y->first_port && |
| x->last_port == y->last_port && |
| x->timeout == y->timeout; |
| } |
| |
| static const struct ip_set_type_variant bitmap_port = { |
| .kadt = bitmap_port_kadt, |
| .uadt = bitmap_port_uadt, |
| .adt = { |
| [IPSET_ADD] = bitmap_port_add, |
| [IPSET_DEL] = bitmap_port_del, |
| [IPSET_TEST] = bitmap_port_test, |
| }, |
| .destroy = bitmap_port_destroy, |
| .flush = bitmap_port_flush, |
| .head = bitmap_port_head, |
| .list = bitmap_port_list, |
| .same_set = bitmap_port_same_set, |
| }; |
| |
| static const struct ip_set_type_variant bitmap_tport = { |
| .kadt = bitmap_port_kadt, |
| .uadt = bitmap_port_uadt, |
| .adt = { |
| [IPSET_ADD] = bitmap_port_tadd, |
| [IPSET_DEL] = bitmap_port_tdel, |
| [IPSET_TEST] = bitmap_port_ttest, |
| }, |
| .destroy = bitmap_port_destroy, |
| .flush = bitmap_port_flush, |
| .head = bitmap_port_head, |
| .list = bitmap_port_tlist, |
| .same_set = bitmap_port_same_set, |
| }; |
| |
| static void |
| bitmap_port_gc(unsigned long ul_set) |
| { |
| struct ip_set *set = (struct ip_set *) ul_set; |
| struct bitmap_port *map = set->data; |
| unsigned long *table = map->members; |
| u32 id; /* wraparound */ |
| u16 last = map->last_port - map->first_port; |
| |
| /* We run parallel with other readers (test element) |
| * but adding/deleting new entries is locked out */ |
| read_lock_bh(&set->lock); |
| for (id = 0; id <= last; id++) |
| if (ip_set_timeout_expired(table[id])) |
| table[id] = IPSET_ELEM_UNSET; |
| read_unlock_bh(&set->lock); |
| |
| map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; |
| add_timer(&map->gc); |
| } |
| |
| static void |
| bitmap_port_gc_init(struct ip_set *set) |
| { |
| struct bitmap_port *map = set->data; |
| |
| init_timer(&map->gc); |
| map->gc.data = (unsigned long) set; |
| map->gc.function = bitmap_port_gc; |
| map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; |
| add_timer(&map->gc); |
| } |
| |
| /* Create bitmap:ip type of sets */ |
| |
| static bool |
| init_map_port(struct ip_set *set, struct bitmap_port *map, |
| u16 first_port, u16 last_port) |
| { |
| map->members = ip_set_alloc(map->memsize); |
| if (!map->members) |
| return false; |
| map->first_port = first_port; |
| map->last_port = last_port; |
| map->timeout = IPSET_NO_TIMEOUT; |
| |
| set->data = map; |
| set->family = AF_UNSPEC; |
| |
| return true; |
| } |
| |
| static int |
| bitmap_port_create(struct ip_set *set, struct nlattr *tb[], |
| u32 flags) |
| { |
| struct bitmap_port *map; |
| u16 first_port, last_port; |
| |
| if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || |
| !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) || |
| !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT))) |
| return -IPSET_ERR_PROTOCOL; |
| |
| first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]); |
| last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); |
| if (first_port > last_port) { |
| u16 tmp = first_port; |
| |
| first_port = last_port; |
| last_port = tmp; |
| } |
| |
| map = kzalloc(sizeof(*map), GFP_KERNEL); |
| if (!map) |
| return -ENOMEM; |
| |
| if (tb[IPSET_ATTR_TIMEOUT]) { |
| map->memsize = (last_port - first_port + 1) |
| * sizeof(unsigned long); |
| |
| if (!init_map_port(set, map, first_port, last_port)) { |
| kfree(map); |
| return -ENOMEM; |
| } |
| |
| map->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); |
| set->variant = &bitmap_tport; |
| |
| bitmap_port_gc_init(set); |
| } else { |
| map->memsize = bitmap_bytes(0, last_port - first_port); |
| pr_debug("memsize: %zu\n", map->memsize); |
| if (!init_map_port(set, map, first_port, last_port)) { |
| kfree(map); |
| return -ENOMEM; |
| } |
| |
| set->variant = &bitmap_port; |
| } |
| return 0; |
| } |
| |
| static struct ip_set_type bitmap_port_type = { |
| .name = "bitmap:port", |
| .protocol = IPSET_PROTOCOL, |
| .features = IPSET_TYPE_PORT, |
| .dimension = IPSET_DIM_ONE, |
| .family = AF_UNSPEC, |
| .revision_min = 0, |
| .revision_max = 0, |
| .create = bitmap_port_create, |
| .create_policy = { |
| [IPSET_ATTR_PORT] = { .type = NLA_U16 }, |
| [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, |
| [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
| }, |
| .adt_policy = { |
| [IPSET_ATTR_PORT] = { .type = NLA_U16 }, |
| [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, |
| [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
| [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
| }, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init |
| bitmap_port_init(void) |
| { |
| return ip_set_type_register(&bitmap_port_type); |
| } |
| |
| static void __exit |
| bitmap_port_fini(void) |
| { |
| ip_set_type_unregister(&bitmap_port_type); |
| } |
| |
| module_init(bitmap_port_init); |
| module_exit(bitmap_port_fini); |