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author | Tomasz Chilinski <tomasz.chilinski@chilan.com> | 2016-05-05 08:21:26 +0300 |
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committer | Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | 2016-11-10 15:28:49 +0300 |
commit | c0db95c7bcca956d444f233aee5c2b124392ef9a (patch) | |
tree | 4f4c6a09a9b7e74788bdd4ee83bde575a23ea315 /net/netfilter/ipset/ip_set_hash_ipmac.c | |
parent | a71bdbfa99272f0beb92b669d2bbc626871e00e5 (diff) | |
download | linux-c0db95c7bcca956d444f233aee5c2b124392ef9a.tar.xz |
netfilter: ipset: hash:ipmac type support added to ipset
Introduce the hash:ipmac type.
Signed-off-by: Tomasz Chili??ski <tomasz.chilinski@chilan.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Diffstat (limited to 'net/netfilter/ipset/ip_set_hash_ipmac.c')
-rw-r--r-- | net/netfilter/ipset/ip_set_hash_ipmac.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/net/netfilter/ipset/ip_set_hash_ipmac.c b/net/netfilter/ipset/ip_set_hash_ipmac.c new file mode 100644 index 000000000000..d9eb144b01d6 --- /dev/null +++ b/net/netfilter/ipset/ip_set_hash_ipmac.c @@ -0,0 +1,315 @@ +/* Copyright (C) 2016 Tomasz Chilinski <tomasz.chilinski@chilan.com> + * + * 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 hash:ip,mac type */ + +#include <linux/jhash.h> +#include <linux/module.h> +#include <linux/ip.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/errno.h> +#include <linux/random.h> +#include <linux/if_ether.h> +#include <net/ip.h> +#include <net/ipv6.h> +#include <net/netlink.h> +#include <net/tcp.h> + +#include <linux/netfilter.h> +#include <linux/netfilter/ipset/pfxlen.h> +#include <linux/netfilter/ipset/ip_set.h> +#include <linux/netfilter/ipset/ip_set_hash.h> + +#define IPSET_TYPE_REV_MIN 0 +#define IPSET_TYPE_REV_MAX 0 + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Tomasz Chilinski <tomasz.chilinski@chilan.com>"); +IP_SET_MODULE_DESC("hash:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); +MODULE_ALIAS("ip_set_hash:ip,mac"); + +/* Type specific function prefix */ +#define HTYPE hash_ipmac + +/* Zero valued element is not supported */ +static const unsigned char invalid_ether[ETH_ALEN] = { 0 }; + +/* IPv4 variant */ + +/* Member elements */ +struct hash_ipmac4_elem { + /* Zero valued IP addresses cannot be stored */ + __be32 ip; + union { + unsigned char ether[ETH_ALEN]; + __be32 foo[2]; + }; +}; + +/* Common functions */ + +static inline bool +hash_ipmac4_data_equal(const struct hash_ipmac4_elem *e1, + const struct hash_ipmac4_elem *e2, + u32 *multi) +{ + return e1->ip == e2->ip && ether_addr_equal(e1->ether, e2->ether); +} + +static bool +hash_ipmac4_data_list(struct sk_buff *skb, const struct hash_ipmac4_elem *e) +{ + if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip) || + nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) + goto nla_put_failure; + return 0; + +nla_put_failure: + return 1; +} + +static inline void +hash_ipmac4_data_next(struct hash_ipmac4_elem *next, + const struct hash_ipmac4_elem *e) +{ + next->ip = e->ip; +} + +#define MTYPE hash_ipmac4 +#define PF 4 +#define HOST_MASK 32 +#define HKEY_DATALEN sizeof(struct hash_ipmac4_elem) +#include "ip_set_hash_gen.h" + +static int +hash_ipmac4_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) +{ + ipset_adtfn adtfn = set->variant->adt[adt]; + struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; + struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); + + /* MAC can be src only */ + if (!(opt->flags & IPSET_DIM_TWO_SRC)) + return 0; + + if (skb_mac_header(skb) < skb->head || + (skb_mac_header(skb) + ETH_HLEN) > skb->data) + return -EINVAL; + + memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN); + if (ether_addr_equal(e.ether, invalid_ether)) + return -EINVAL; + + ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); + + return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); +} + +static int +hash_ipmac4_uadt(struct ip_set *set, struct nlattr *tb[], + enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) +{ + ipset_adtfn adtfn = set->variant->adt[adt]; + struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; + struct ip_set_ext ext = IP_SET_INIT_UEXT(set); + int ret; + + if (unlikely(!tb[IPSET_ATTR_IP] || + !tb[IPSET_ATTR_ETHER] || + nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || + !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) + return -IPSET_ERR_PROTOCOL; + + if (tb[IPSET_ATTR_LINENO]) + *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); + + ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) || + ip_set_get_extensions(set, tb, &ext); + if (ret) + return ret; + memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); + if (ether_addr_equal(e.ether, invalid_ether)) + return -IPSET_ERR_HASH_ELEM; + + return adtfn(set, &e, &ext, &ext, flags); +} + +/* IPv6 variant */ + +/* Member elements */ +struct hash_ipmac6_elem { + /* Zero valued IP addresses cannot be stored */ + union nf_inet_addr ip; + union { + unsigned char ether[ETH_ALEN]; + __be32 foo[2]; + }; +}; + +/* Common functions */ + +static inline bool +hash_ipmac6_data_equal(const struct hash_ipmac6_elem *e1, + const struct hash_ipmac6_elem *e2, + u32 *multi) +{ + return ipv6_addr_equal(&e1->ip.in6, &e2->ip.in6) && + ether_addr_equal(e1->ether, e2->ether); +} + +static bool +hash_ipmac6_data_list(struct sk_buff *skb, const struct hash_ipmac6_elem *e) +{ + if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) || + nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) + goto nla_put_failure; + return 0; + +nla_put_failure: + return 1; +} + +static inline void +hash_ipmac6_data_next(struct hash_ipmac6_elem *next, + const struct hash_ipmac6_elem *e) +{ +} + +#undef MTYPE +#undef PF +#undef HOST_MASK +#undef HKEY_DATALEN + +#define MTYPE hash_ipmac6 +#define PF 6 +#define HOST_MASK 128 +#define HKEY_DATALEN sizeof(struct hash_ipmac6_elem) +#define IP_SET_EMIT_CREATE +#include "ip_set_hash_gen.h" + +static int +hash_ipmac6_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) +{ + ipset_adtfn adtfn = set->variant->adt[adt]; + struct hash_ipmac6_elem e = { + { .all = { 0 } }, + { .foo[0] = 0, .foo[1] = 0 } + }; + struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); + + /* MAC can be src only */ + if (!(opt->flags & IPSET_DIM_TWO_SRC)) + return 0; + + if (skb_mac_header(skb) < skb->head || + (skb_mac_header(skb) + ETH_HLEN) > skb->data) + return -EINVAL; + + memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN); + if (ether_addr_equal(e.ether, invalid_ether)) + return -EINVAL; + + ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); + + return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); +} + +static int +hash_ipmac6_uadt(struct ip_set *set, struct nlattr *tb[], + enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) +{ + ipset_adtfn adtfn = set->variant->adt[adt]; + struct hash_ipmac6_elem e = { + { .all = { 0 } }, + { .foo[0] = 0, .foo[1] = 0 } + }; + struct ip_set_ext ext = IP_SET_INIT_UEXT(set); + int ret; + + if (unlikely(!tb[IPSET_ATTR_IP] || + !tb[IPSET_ATTR_ETHER] || + nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || + !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) + return -IPSET_ERR_PROTOCOL; + + if (tb[IPSET_ATTR_LINENO]) + *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); + + ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) || + ip_set_get_extensions(set, tb, &ext); + if (ret) + return ret; + + memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); + if (ether_addr_equal(e.ether, invalid_ether)) + return -IPSET_ERR_HASH_ELEM; + + return adtfn(set, &e, &ext, &ext, flags); +} + +static struct ip_set_type hash_ipmac_type __read_mostly = { + .name = "hash:ip,mac", + .protocol = IPSET_PROTOCOL, + .features = IPSET_TYPE_IP | IPSET_TYPE_MAC, + .dimension = IPSET_DIM_TWO, + .family = NFPROTO_UNSPEC, + .revision_min = IPSET_TYPE_REV_MIN, + .revision_max = IPSET_TYPE_REV_MAX, + .create = hash_ipmac_create, + .create_policy = { + [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, + [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, + [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, + [IPSET_ATTR_RESIZE] = { .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 }, + [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, + [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, + [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, + }, + .me = THIS_MODULE, +}; + +static int __init +hash_ipmac_init(void) +{ + return ip_set_type_register(&hash_ipmac_type); +} + +static void __exit +hash_ipmac_fini(void) +{ + ip_set_type_unregister(&hash_ipmac_type); +} + +module_init(hash_ipmac_init); +module_exit(hash_ipmac_fini); |