| /* Copyright (C) 2003-2013 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 IPSET_TYPE_REV_MIN 0 |
| /* 1 Counter support added */ |
| /* 2 Comment support added */ |
| #define IPSET_TYPE_REV_MAX 3 /* skbinfo support added */ |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); |
| IP_SET_MODULE_DESC("bitmap:port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); |
| MODULE_ALIAS("ip_set_bitmap:port"); |
| |
| #define MTYPE 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 */ |
| u32 elements; /* number of max elements in the set */ |
| size_t memsize; /* members size */ |
| struct timer_list gc; /* garbage collection */ |
| unsigned char extensions[0] /* data extensions */ |
| __aligned(__alignof__(u64)); |
| }; |
| |
| /* ADT structure for generic function args */ |
| struct bitmap_port_adt_elem { |
| u16 id; |
| }; |
| |
| static inline u16 |
| port_to_id(const struct bitmap_port *m, u16 port) |
| { |
| return port - m->first_port; |
| } |
| |
| /* Common functions */ |
| |
| static inline int |
| bitmap_port_do_test(const struct bitmap_port_adt_elem *e, |
| const struct bitmap_port *map, size_t dsize) |
| { |
| return !!test_bit(e->id, map->members); |
| } |
| |
| static inline int |
| bitmap_port_gc_test(u16 id, const struct bitmap_port *map, size_t dsize) |
| { |
| return !!test_bit(id, map->members); |
| } |
| |
| static inline int |
| bitmap_port_do_add(const struct bitmap_port_adt_elem *e, |
| struct bitmap_port *map, u32 flags, size_t dsize) |
| { |
| return !!test_bit(e->id, map->members); |
| } |
| |
| static inline int |
| bitmap_port_do_del(const struct bitmap_port_adt_elem *e, |
| struct bitmap_port *map) |
| { |
| return !test_and_clear_bit(e->id, map->members); |
| } |
| |
| static inline int |
| bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id, |
| size_t dsize) |
| { |
| return nla_put_net16(skb, IPSET_ATTR_PORT, |
| htons(map->first_port + id)); |
| } |
| |
| static inline int |
| bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map) |
| { |
| return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) || |
| nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port)); |
| } |
| |
| static int |
| bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb, |
| const struct xt_action_param *par, |
| enum ipset_adt adt, struct ip_set_adt_opt *opt) |
| { |
| struct bitmap_port *map = set->data; |
| ipset_adtfn adtfn = set->variant->adt[adt]; |
| struct bitmap_port_adt_elem e = { .id = 0 }; |
| struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
| __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; |
| |
| e.id = port_to_id(map, port); |
| |
| return adtfn(set, &e, &ext, &opt->ext, 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]; |
| struct bitmap_port_adt_elem e = { .id = 0 }; |
| struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
| u32 port; /* wraparound */ |
| u16 port_to; |
| int ret = 0; |
| |
| if (tb[IPSET_ATTR_LINENO]) |
| *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); |
| |
| if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || |
| !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO))) |
| return -IPSET_ERR_PROTOCOL; |
| |
| port = ip_set_get_h16(tb[IPSET_ATTR_PORT]); |
| if (port < map->first_port || port > map->last_port) |
| return -IPSET_ERR_BITMAP_RANGE; |
| ret = ip_set_get_extensions(set, tb, &ext); |
| if (ret) |
| return ret; |
| |
| if (adt == IPSET_TEST) { |
| e.id = port_to_id(map, port); |
| return adtfn(set, &e, &ext, &ext, 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++) { |
| e.id = port_to_id(map, port); |
| ret = adtfn(set, &e, &ext, &ext, flags); |
| |
| if (ret && !ip_set_eexist(ret, flags)) |
| return ret; |
| |
| ret = 0; |
| } |
| return ret; |
| } |
| |
| 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 && |
| a->timeout == b->timeout && |
| a->extensions == b->extensions; |
| } |
| |
| /* Plain variant */ |
| |
| struct bitmap_port_elem { |
| }; |
| |
| #include "ip_set_bitmap_gen.h" |
| |
| /* 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; |
| set->timeout = IPSET_NO_TIMEOUT; |
| |
| set->data = map; |
| set->family = NFPROTO_UNSPEC; |
| |
| return true; |
| } |
| |
| static int |
| bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[], |
| u32 flags) |
| { |
| struct bitmap_port *map; |
| u16 first_port, last_port; |
| u32 elements; |
| |
| 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) || |
| !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) |
| 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; |
| } |
| |
| elements = last_port - first_port + 1; |
| set->dsize = ip_set_elem_len(set, tb, 0, 0); |
| map = ip_set_alloc(sizeof(*map) + elements * set->dsize); |
| if (!map) |
| return -ENOMEM; |
| |
| map->elements = elements; |
| map->memsize = bitmap_bytes(0, map->elements); |
| set->variant = &bitmap_port; |
| if (!init_map_port(set, map, first_port, last_port)) { |
| kfree(map); |
| return -ENOMEM; |
| } |
| if (tb[IPSET_ATTR_TIMEOUT]) { |
| set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); |
| bitmap_port_gc_init(set, bitmap_port_gc); |
| } |
| 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 = NFPROTO_UNSPEC, |
| .revision_min = IPSET_TYPE_REV_MIN, |
| .revision_max = IPSET_TYPE_REV_MAX, |
| .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 }, |
| [IPSET_ATTR_CADT_FLAGS] = { .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 }, |
| [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, |
| [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, |
| [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, |
| .len = IPSET_MAX_COMMENT_SIZE }, |
| [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, |
| [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, |
| [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, |
| }, |
| .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) |
| { |
| rcu_barrier(); |
| ip_set_type_unregister(&bitmap_port_type); |
| } |
| |
| module_init(bitmap_port_init); |
| module_exit(bitmap_port_fini); |