| /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu> |
| * Patrick Schaaf <bof@bof.de> |
| * Martin Josefsson <gandalf@wlug.westbo.se> |
| * 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:ip,mac type */ |
| |
| #include <linux/module.h> |
| #include <linux/ip.h> |
| #include <linux/etherdevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/errno.h> |
| #include <linux/if_ether.h> |
| #include <linux/netlink.h> |
| #include <linux/jiffies.h> |
| #include <linux/timer.h> |
| #include <net/netlink.h> |
| |
| #include <linux/netfilter/ipset/pfxlen.h> |
| #include <linux/netfilter/ipset/ip_set.h> |
| #include <linux/netfilter/ipset/ip_set_bitmap.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:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); |
| MODULE_ALIAS("ip_set_bitmap:ip,mac"); |
| |
| #define MTYPE bitmap_ipmac |
| #define HOST_MASK 32 |
| #define IP_SET_BITMAP_STORED_TIMEOUT |
| |
| enum { |
| MAC_UNSET, /* element is set, without MAC */ |
| MAC_FILLED, /* element is set with MAC */ |
| }; |
| |
| /* Type structure */ |
| struct bitmap_ipmac { |
| void *members; /* the set members */ |
| void *extensions; /* MAC + data extensions */ |
| u32 first_ip; /* host byte order, included in range */ |
| u32 last_ip; /* 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 collector */ |
| }; |
| |
| /* ADT structure for generic function args */ |
| struct bitmap_ipmac_adt_elem { |
| u16 id; |
| unsigned char *ether; |
| }; |
| |
| struct bitmap_ipmac_elem { |
| unsigned char ether[ETH_ALEN]; |
| unsigned char filled; |
| } __attribute__ ((aligned)); |
| |
| static inline u32 |
| ip_to_id(const struct bitmap_ipmac *m, u32 ip) |
| { |
| return ip - m->first_ip; |
| } |
| |
| static inline struct bitmap_ipmac_elem * |
| get_elem(void *extensions, u16 id, size_t dsize) |
| { |
| return (struct bitmap_ipmac_elem *)(extensions + id * dsize); |
| } |
| |
| /* Common functions */ |
| |
| static inline int |
| bitmap_ipmac_do_test(const struct bitmap_ipmac_adt_elem *e, |
| const struct bitmap_ipmac *map, size_t dsize) |
| { |
| const struct bitmap_ipmac_elem *elem; |
| |
| if (!test_bit(e->id, map->members)) |
| return 0; |
| elem = get_elem(map->extensions, e->id, dsize); |
| if (elem->filled == MAC_FILLED) |
| return !e->ether || |
| ether_addr_equal(e->ether, elem->ether); |
| /* Trigger kernel to fill out the ethernet address */ |
| return -EAGAIN; |
| } |
| |
| static inline int |
| bitmap_ipmac_gc_test(u16 id, const struct bitmap_ipmac *map, size_t dsize) |
| { |
| const struct bitmap_ipmac_elem *elem; |
| |
| if (!test_bit(id, map->members)) |
| return 0; |
| elem = get_elem(map->extensions, id, dsize); |
| /* Timer not started for the incomplete elements */ |
| return elem->filled == MAC_FILLED; |
| } |
| |
| static inline int |
| bitmap_ipmac_is_filled(const struct bitmap_ipmac_elem *elem) |
| { |
| return elem->filled == MAC_FILLED; |
| } |
| |
| static inline int |
| bitmap_ipmac_add_timeout(unsigned long *timeout, |
| const struct bitmap_ipmac_adt_elem *e, |
| const struct ip_set_ext *ext, struct ip_set *set, |
| struct bitmap_ipmac *map, int mode) |
| { |
| u32 t = ext->timeout; |
| |
| if (mode == IPSET_ADD_START_STORED_TIMEOUT) { |
| if (t == set->timeout) |
| /* Timeout was not specified, get stored one */ |
| t = *timeout; |
| ip_set_timeout_set(timeout, t); |
| } else { |
| /* If MAC is unset yet, we store plain timeout value |
| * because the timer is not activated yet |
| * and we can reuse it later when MAC is filled out, |
| * possibly by the kernel |
| */ |
| if (e->ether) |
| ip_set_timeout_set(timeout, t); |
| else |
| *timeout = t; |
| } |
| return 0; |
| } |
| |
| static inline int |
| bitmap_ipmac_do_add(const struct bitmap_ipmac_adt_elem *e, |
| struct bitmap_ipmac *map, u32 flags, size_t dsize) |
| { |
| struct bitmap_ipmac_elem *elem; |
| |
| elem = get_elem(map->extensions, e->id, dsize); |
| if (test_bit(e->id, map->members)) { |
| if (elem->filled == MAC_FILLED) { |
| if (e->ether && |
| (flags & IPSET_FLAG_EXIST) && |
| !ether_addr_equal(e->ether, elem->ether)) { |
| /* memcpy isn't atomic */ |
| clear_bit(e->id, map->members); |
| smp_mb__after_atomic(); |
| ether_addr_copy(elem->ether, e->ether); |
| } |
| return IPSET_ADD_FAILED; |
| } else if (!e->ether) |
| /* Already added without ethernet address */ |
| return IPSET_ADD_FAILED; |
| /* Fill the MAC address and trigger the timer activation */ |
| clear_bit(e->id, map->members); |
| smp_mb__after_atomic(); |
| ether_addr_copy(elem->ether, e->ether); |
| elem->filled = MAC_FILLED; |
| return IPSET_ADD_START_STORED_TIMEOUT; |
| } else if (e->ether) { |
| /* We can store MAC too */ |
| ether_addr_copy(elem->ether, e->ether); |
| elem->filled = MAC_FILLED; |
| return 0; |
| } |
| elem->filled = MAC_UNSET; |
| /* MAC is not stored yet, don't start timer */ |
| return IPSET_ADD_STORE_PLAIN_TIMEOUT; |
| } |
| |
| static inline int |
| bitmap_ipmac_do_del(const struct bitmap_ipmac_adt_elem *e, |
| struct bitmap_ipmac *map) |
| { |
| return !test_and_clear_bit(e->id, map->members); |
| } |
| |
| static inline int |
| bitmap_ipmac_do_list(struct sk_buff *skb, const struct bitmap_ipmac *map, |
| u32 id, size_t dsize) |
| { |
| const struct bitmap_ipmac_elem *elem = |
| get_elem(map->extensions, id, dsize); |
| |
| return nla_put_ipaddr4(skb, IPSET_ATTR_IP, |
| htonl(map->first_ip + id)) || |
| (elem->filled == MAC_FILLED && |
| nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, elem->ether)); |
| } |
| |
| static inline int |
| bitmap_ipmac_do_head(struct sk_buff *skb, const struct bitmap_ipmac *map) |
| { |
| return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) || |
| nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip)); |
| } |
| |
| static int |
| bitmap_ipmac_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_ipmac *map = set->data; |
| ipset_adtfn adtfn = set->variant->adt[adt]; |
| struct bitmap_ipmac_adt_elem e = { .id = 0 }; |
| struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
| u32 ip; |
| |
| /* MAC can be src only */ |
| if (!(opt->flags & IPSET_DIM_TWO_SRC)) |
| return 0; |
| |
| ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC)); |
| if (ip < map->first_ip || ip > map->last_ip) |
| return -IPSET_ERR_BITMAP_RANGE; |
| |
| /* Backward compatibility: we don't check the second flag */ |
| if (skb_mac_header(skb) < skb->head || |
| (skb_mac_header(skb) + ETH_HLEN) > skb->data) |
| return -EINVAL; |
| |
| e.id = ip_to_id(map, ip); |
| e.ether = eth_hdr(skb)->h_source; |
| |
| return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
| } |
| |
| static int |
| bitmap_ipmac_uadt(struct ip_set *set, struct nlattr *tb[], |
| enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
| { |
| const struct bitmap_ipmac *map = set->data; |
| ipset_adtfn adtfn = set->variant->adt[adt]; |
| struct bitmap_ipmac_adt_elem e = { .id = 0 }; |
| struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
| u32 ip = 0; |
| int ret = 0; |
| |
| if (tb[IPSET_ATTR_LINENO]) |
| *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); |
| |
| if (unlikely(!tb[IPSET_ATTR_IP])) |
| return -IPSET_ERR_PROTOCOL; |
| |
| ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip); |
| if (ret) |
| return ret; |
| |
| ret = ip_set_get_extensions(set, tb, &ext); |
| if (ret) |
| return ret; |
| |
| if (ip < map->first_ip || ip > map->last_ip) |
| return -IPSET_ERR_BITMAP_RANGE; |
| |
| e.id = ip_to_id(map, ip); |
| if (tb[IPSET_ATTR_ETHER]) |
| e.ether = nla_data(tb[IPSET_ATTR_ETHER]); |
| else |
| e.ether = NULL; |
| |
| ret = adtfn(set, &e, &ext, &ext, flags); |
| |
| return ip_set_eexist(ret, flags) ? 0 : ret; |
| } |
| |
| static bool |
| bitmap_ipmac_same_set(const struct ip_set *a, const struct ip_set *b) |
| { |
| const struct bitmap_ipmac *x = a->data; |
| const struct bitmap_ipmac *y = b->data; |
| |
| return x->first_ip == y->first_ip && |
| x->last_ip == y->last_ip && |
| a->timeout == b->timeout && |
| a->extensions == b->extensions; |
| } |
| |
| /* Plain variant */ |
| |
| #include "ip_set_bitmap_gen.h" |
| |
| /* Create bitmap:ip,mac type of sets */ |
| |
| static bool |
| init_map_ipmac(struct ip_set *set, struct bitmap_ipmac *map, |
| u32 first_ip, u32 last_ip, u32 elements) |
| { |
| map->members = ip_set_alloc(map->memsize); |
| if (!map->members) |
| return false; |
| if (set->dsize) { |
| map->extensions = ip_set_alloc(set->dsize * elements); |
| if (!map->extensions) { |
| kfree(map->members); |
| return false; |
| } |
| } |
| map->first_ip = first_ip; |
| map->last_ip = last_ip; |
| map->elements = elements; |
| set->timeout = IPSET_NO_TIMEOUT; |
| |
| set->data = map; |
| set->family = NFPROTO_IPV4; |
| |
| return true; |
| } |
| |
| static int |
| bitmap_ipmac_create(struct net *net, struct ip_set *set, struct nlattr *tb[], |
| u32 flags) |
| { |
| u32 first_ip = 0, last_ip = 0; |
| u64 elements; |
| struct bitmap_ipmac *map; |
| int ret; |
| |
| if (unlikely(!tb[IPSET_ATTR_IP] || |
| !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || |
| !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) |
| return -IPSET_ERR_PROTOCOL; |
| |
| ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip); |
| if (ret) |
| return ret; |
| |
| if (tb[IPSET_ATTR_IP_TO]) { |
| ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip); |
| if (ret) |
| return ret; |
| if (first_ip > last_ip) { |
| u32 tmp = first_ip; |
| |
| first_ip = last_ip; |
| last_ip = tmp; |
| } |
| } else if (tb[IPSET_ATTR_CIDR]) { |
| u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); |
| |
| if (cidr >= HOST_MASK) |
| return -IPSET_ERR_INVALID_CIDR; |
| ip_set_mask_from_to(first_ip, last_ip, cidr); |
| } else { |
| return -IPSET_ERR_PROTOCOL; |
| } |
| |
| elements = (u64)last_ip - first_ip + 1; |
| |
| if (elements > IPSET_BITMAP_MAX_RANGE + 1) |
| return -IPSET_ERR_BITMAP_RANGE_SIZE; |
| |
| map = kzalloc(sizeof(*map), GFP_KERNEL); |
| if (!map) |
| return -ENOMEM; |
| |
| map->memsize = bitmap_bytes(0, elements - 1); |
| set->variant = &bitmap_ipmac; |
| set->dsize = ip_set_elem_len(set, tb, |
| sizeof(struct bitmap_ipmac_elem)); |
| if (!init_map_ipmac(set, map, first_ip, last_ip, elements)) { |
| kfree(map); |
| return -ENOMEM; |
| } |
| if (tb[IPSET_ATTR_TIMEOUT]) { |
| set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); |
| bitmap_ipmac_gc_init(set, bitmap_ipmac_gc); |
| } |
| return 0; |
| } |
| |
| static struct ip_set_type bitmap_ipmac_type = { |
| .name = "bitmap:ip,mac", |
| .protocol = IPSET_PROTOCOL, |
| .features = IPSET_TYPE_IP | IPSET_TYPE_MAC, |
| .dimension = IPSET_DIM_TWO, |
| .family = NFPROTO_IPV4, |
| .revision_min = IPSET_TYPE_REV_MIN, |
| .revision_max = IPSET_TYPE_REV_MAX, |
| .create = bitmap_ipmac_create, |
| .create_policy = { |
| [IPSET_ATTR_IP] = { .type = NLA_NESTED }, |
| [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, |
| [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, |
| [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
| [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
| }, |
| .adt_policy = { |
| [IPSET_ATTR_IP] = { .type = NLA_NESTED }, |
| [IPSET_ATTR_ETHER] = { .type = NLA_BINARY, |
| .len = ETH_ALEN }, |
| [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_ipmac_init(void) |
| { |
| return ip_set_type_register(&bitmap_ipmac_type); |
| } |
| |
| static void __exit |
| bitmap_ipmac_fini(void) |
| { |
| rcu_barrier(); |
| ip_set_type_unregister(&bitmap_ipmac_type); |
| } |
| |
| module_init(bitmap_ipmac_init); |
| module_exit(bitmap_ipmac_fini); |