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Linux/net/netfilter/ipset/ip_set_hash_mac.c

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  1 /* Copyright (C) 2014 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  2  *
  3  * This program is free software; you can redistribute it and/or modify
  4  * it under the terms of the GNU General Public License version 2 as
  5  * published by the Free Software Foundation.
  6  */
  7 
  8 /* Kernel module implementing an IP set type: the hash:mac type */
  9 
 10 #include <linux/jhash.h>
 11 #include <linux/module.h>
 12 #include <linux/etherdevice.h>
 13 #include <linux/skbuff.h>
 14 #include <linux/errno.h>
 15 #include <linux/if_ether.h>
 16 #include <net/netlink.h>
 17 
 18 #include <linux/netfilter.h>
 19 #include <linux/netfilter/ipset/ip_set.h>
 20 #include <linux/netfilter/ipset/ip_set_hash.h>
 21 
 22 #define IPSET_TYPE_REV_MIN      0
 23 #define IPSET_TYPE_REV_MAX      0
 24 
 25 MODULE_LICENSE("GPL");
 26 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
 27 IP_SET_MODULE_DESC("hash:mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 28 MODULE_ALIAS("ip_set_hash:mac");
 29 
 30 /* Type specific function prefix */
 31 #define HTYPE           hash_mac
 32 
 33 /* Member elements */
 34 struct hash_mac4_elem {
 35         /* Zero valued IP addresses cannot be stored */
 36         union {
 37                 unsigned char ether[ETH_ALEN];
 38                 __be32 foo[2];
 39         };
 40 };
 41 
 42 /* Common functions */
 43 
 44 static inline bool
 45 hash_mac4_data_equal(const struct hash_mac4_elem *e1,
 46                      const struct hash_mac4_elem *e2,
 47                      u32 *multi)
 48 {
 49         return ether_addr_equal(e1->ether, e2->ether);
 50 }
 51 
 52 static inline bool
 53 hash_mac4_data_list(struct sk_buff *skb, const struct hash_mac4_elem *e)
 54 {
 55         if (nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether))
 56                 goto nla_put_failure;
 57         return false;
 58 
 59 nla_put_failure:
 60         return true;
 61 }
 62 
 63 static inline void
 64 hash_mac4_data_next(struct hash_mac4_elem *next,
 65                     const struct hash_mac4_elem *e)
 66 {
 67 }
 68 
 69 #define MTYPE           hash_mac4
 70 #define HOST_MASK       32
 71 #define IP_SET_EMIT_CREATE
 72 #define IP_SET_PROTO_UNDEF
 73 #include "ip_set_hash_gen.h"
 74 
 75 /* Zero valued element is not supported */
 76 static const unsigned char invalid_ether[ETH_ALEN] = { 0 };
 77 
 78 static int
 79 hash_mac4_kadt(struct ip_set *set, const struct sk_buff *skb,
 80                const struct xt_action_param *par,
 81                enum ipset_adt adt, struct ip_set_adt_opt *opt)
 82 {
 83         ipset_adtfn adtfn = set->variant->adt[adt];
 84         struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } };
 85         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 86 
 87          /* MAC can be src only */
 88         if (!(opt->flags & IPSET_DIM_ONE_SRC))
 89                 return 0;
 90 
 91         if (skb_mac_header(skb) < skb->head ||
 92             (skb_mac_header(skb) + ETH_HLEN) > skb->data)
 93                 return -EINVAL;
 94 
 95         ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
 96         if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0)
 97                 return -EINVAL;
 98         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 99 }
100 
101 static int
102 hash_mac4_uadt(struct ip_set *set, struct nlattr *tb[],
103                enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
104 {
105         ipset_adtfn adtfn = set->variant->adt[adt];
106         struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } };
107         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
108         int ret;
109 
110         if (tb[IPSET_ATTR_LINENO])
111                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
112 
113         if (unlikely(!tb[IPSET_ATTR_ETHER] ||
114                      nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN))
115                 return -IPSET_ERR_PROTOCOL;
116 
117         ret = ip_set_get_extensions(set, tb, &ext);
118         if (ret)
119                 return ret;
120         ether_addr_copy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]));
121         if (memcmp(e.ether, invalid_ether, ETH_ALEN) == 0)
122                 return -IPSET_ERR_HASH_ELEM;
123 
124         return adtfn(set, &e, &ext, &ext, flags);
125 }
126 
127 static struct ip_set_type hash_mac_type __read_mostly = {
128         .name           = "hash:mac",
129         .protocol       = IPSET_PROTOCOL,
130         .features       = IPSET_TYPE_MAC,
131         .dimension      = IPSET_DIM_ONE,
132         .family         = NFPROTO_UNSPEC,
133         .revision_min   = IPSET_TYPE_REV_MIN,
134         .revision_max   = IPSET_TYPE_REV_MAX,
135         .create         = hash_mac_create,
136         .create_policy  = {
137                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
138                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
139                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
140                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
141                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
142                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
143         },
144         .adt_policy     = {
145                 [IPSET_ATTR_ETHER]      = { .type = NLA_BINARY,
146                                             .len  = ETH_ALEN },
147                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
148                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
149                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
150                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
151                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
152                                             .len  = IPSET_MAX_COMMENT_SIZE },
153                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
154                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
155                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
156         },
157         .me             = THIS_MODULE,
158 };
159 
160 static int __init
161 hash_mac_init(void)
162 {
163         return ip_set_type_register(&hash_mac_type);
164 }
165 
166 static void __exit
167 hash_mac_fini(void)
168 {
169         rcu_barrier();
170         ip_set_type_unregister(&hash_mac_type);
171 }
172 
173 module_init(hash_mac_init);
174 module_exit(hash_mac_fini);
175 

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