net/netfilter/ipset/ip_set_hash_ipmark.c

   1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
   2  * Copyright (C) 2013 Smoothwall Ltd. <vytas.dauksa@smoothwall.net>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 /* Kernel module implementing an IP set type: the hash:ip,mark type */
  10
  11 #include <linux/jhash.h>
  12 #include <linux/module.h>
  13 #include <linux/ip.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/errno.h>
  16 #include <linux/random.h>
  17 #include <net/ip.h>
  18 #include <net/ipv6.h>
  19 #include <net/netlink.h>
  20 #include <net/tcp.h>
  21
  22 #include <linux/netfilter.h>
  23 #include <linux/netfilter/ipset/pfxlen.h>
  24 #include <linux/netfilter/ipset/ip_set.h>
  25 #include <linux/netfilter/ipset/ip_set_hash.h>
  26
  27 #define IPSET_TYPE_REV_MIN      0
  28 #define IPSET_TYPE_REV_MAX      1       /* Forceadd support */
  29
  30 MODULE_LICENSE("GPL");
  31 MODULE_AUTHOR("Vytas Dauksa <vytas.dauksa@smoothwall.net>");
  32 IP_SET_MODULE_DESC("hash:ip,mark", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  33 MODULE_ALIAS("ip_set_hash:ip,mark");
  34
  35 /* Type specific function prefix */
  36 #define HTYPE           hash_ipmark
  37 #define IP_SET_HASH_WITH_MARKMASK
  38
  39 /* IPv4 variant */
  40
  41 /* Member elements */
  42 struct hash_ipmark4_elem {
  43         __be32 ip;
  44         __u32 mark;
  45 };
  46
  47 /* Common functions */
  48
  49 static inline bool
  50 hash_ipmark4_data_equal(const struct hash_ipmark4_elem *ip1,
  51                         const struct hash_ipmark4_elem *ip2,
  52                         u32 *multi)
  53 {
  54         return ip1->ip == ip2->ip &&
  55                ip1->mark == ip2->mark;
  56 }
  57
  58 static bool
  59 hash_ipmark4_data_list(struct sk_buff *skb,
  60                        const struct hash_ipmark4_elem *data)
  61 {
  62         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  63             nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
  64                 goto nla_put_failure;
  65         return 0;
  66
  67 nla_put_failure:
  68         return 1;
  69 }
  70
  71 static inline void
  72 hash_ipmark4_data_next(struct hash_ipmark4_elem *next,
  73                        const struct hash_ipmark4_elem *d)
  74 {
  75         next->ip = d->ip;
  76 }
  77
  78 #define MTYPE           hash_ipmark4
  79 #define PF              4
  80 #define HOST_MASK       32
  81 #define HKEY_DATALEN    sizeof(struct hash_ipmark4_elem)
  82 #include "ip_set_hash_gen.h"
  83
  84 static int
  85 hash_ipmark4_kadt(struct ip_set *set, const struct sk_buff *skb,
  86                   const struct xt_action_param *par,
  87                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
  88 {
  89         const struct hash_ipmark *h = set->data;
  90         ipset_adtfn adtfn = set->variant->adt[adt];
  91         struct hash_ipmark4_elem e = { };
  92         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
  93
  94         e.mark = skb->mark;
  95         e.mark &= h->markmask;
  96
  97         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
  98         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
  99 }
 100
 101 static int
 102 hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
 103                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 104 {
 105         const struct hash_ipmark *h = set->data;
 106         ipset_adtfn adtfn = set->variant->adt[adt];
 107         struct hash_ipmark4_elem e = { };
 108         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 109         u32 ip, ip_to = 0;
 110         int ret;
 111
 112         if (unlikely(!tb[IPSET_ATTR_IP] ||
 113                      !ip_set_attr_netorder(tb, IPSET_ATTR_MARK) ||
 114                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 115                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 116                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
 117                 return -IPSET_ERR_PROTOCOL;
 118
 119         if (tb[IPSET_ATTR_LINENO])
 120                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 121
 122         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
 123               ip_set_get_extensions(set, tb, &ext);
 124         if (ret)
 125                 return ret;
 126
 127         e.mark = ntohl(nla_get_u32(tb[IPSET_ATTR_MARK]));
 128         e.mark &= h->markmask;
 129
 130         if (adt == IPSET_TEST ||
 131             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR])) {
 132                 ret = adtfn(set, &e, &ext, &ext, flags);
 133                 return ip_set_eexist(ret, flags) ? 0 : ret;
 134         }
 135
 136         ip_to = ip = ntohl(e.ip);
 137         if (tb[IPSET_ATTR_IP_TO]) {
 138                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 139                 if (ret)
 140                         return ret;
 141                 if (ip > ip_to)
 142                         swap(ip, ip_to);
 143         } else if (tb[IPSET_ATTR_CIDR]) {
 144                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 145
 146                 if (!cidr || cidr > 32)
 147                         return -IPSET_ERR_INVALID_CIDR;
 148                 ip_set_mask_from_to(ip, ip_to, cidr);
 149         }
 150
 151         if (retried)
 152                 ip = ntohl(h->next.ip);
 153         for (; !before(ip_to, ip); ip++) {
 154                 e.ip = htonl(ip);
 155                 ret = adtfn(set, &e, &ext, &ext, flags);
 156
 157                 if (ret && !ip_set_eexist(ret, flags))
 158                         return ret;
 159                 else
 160                         ret = 0;
 161         }
 162         return ret;
 163 }
 164
 165 /* IPv6 variant */
 166
 167 struct hash_ipmark6_elem {
 168         union nf_inet_addr ip;
 169         __u32 mark;
 170 };
 171
 172 /* Common functions */
 173
 174 static inline bool
 175 hash_ipmark6_data_equal(const struct hash_ipmark6_elem *ip1,
 176                         const struct hash_ipmark6_elem *ip2,
 177                         u32 *multi)
 178 {
 179         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 180                ip1->mark == ip2->mark;
 181 }
 182
 183 static bool
 184 hash_ipmark6_data_list(struct sk_buff *skb,
 185                        const struct hash_ipmark6_elem *data)
 186 {
 187         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 188             nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
 189                 goto nla_put_failure;
 190         return 0;
 191
 192 nla_put_failure:
 193         return 1;
 194 }
 195
 196 static inline void
 197 hash_ipmark6_data_next(struct hash_ipmark4_elem *next,
 198                        const struct hash_ipmark6_elem *d)
 199 {
 200 }
 201
 202 #undef MTYPE
 203 #undef PF
 204 #undef HOST_MASK
 205 #undef HKEY_DATALEN
 206
 207 #define MTYPE           hash_ipmark6
 208 #define PF              6
 209 #define HOST_MASK       128
 210 #define HKEY_DATALEN    sizeof(struct hash_ipmark6_elem)
 211 #define IP_SET_EMIT_CREATE
 212 #include "ip_set_hash_gen.h"
 213
 214
 215 static int
 216 hash_ipmark6_kadt(struct ip_set *set, const struct sk_buff *skb,
 217                   const struct xt_action_param *par,
 218                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 219 {
 220         const struct hash_ipmark *h = set->data;
 221         ipset_adtfn adtfn = set->variant->adt[adt];
 222         struct hash_ipmark6_elem e = { };
 223         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 224
 225         e.mark = skb->mark;
 226         e.mark &= h->markmask;
 227
 228         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 229         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 230 }
 231
 232 static int
 233 hash_ipmark6_uadt(struct ip_set *set, struct nlattr *tb[],
 234                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 235 {
 236         const struct hash_ipmark *h = set->data;
 237         ipset_adtfn adtfn = set->variant->adt[adt];
 238         struct hash_ipmark6_elem e = { };
 239         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 240         int ret;
 241
 242         if (unlikely(!tb[IPSET_ATTR_IP] ||
 243                      !ip_set_attr_netorder(tb, IPSET_ATTR_MARK) ||
 244                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
 245                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
 246                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
 247                      tb[IPSET_ATTR_IP_TO] ||
 248                      tb[IPSET_ATTR_CIDR]))
 249                 return -IPSET_ERR_PROTOCOL;
 250
 251         if (tb[IPSET_ATTR_LINENO])
 252                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 253
 254         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
 255               ip_set_get_extensions(set, tb, &ext);
 256         if (ret)
 257                 return ret;
 258
 259         e.mark = ntohl(nla_get_u32(tb[IPSET_ATTR_MARK]));
 260         e.mark &= h->markmask;
 261
 262         if (adt == IPSET_TEST) {
 263                 ret = adtfn(set, &e, &ext, &ext, flags);
 264                 return ip_set_eexist(ret, flags) ? 0 : ret;
 265         }
 266
 267         ret = adtfn(set, &e, &ext, &ext, flags);
 268         if (ret && !ip_set_eexist(ret, flags))
 269                 return ret;
 270         else
 271                 ret = 0;
 272
 273         return ret;
 274 }
 275
 276 static struct ip_set_type hash_ipmark_type __read_mostly = {
 277         .name           = "hash:ip,mark",
 278         .protocol       = IPSET_PROTOCOL,
 279         .features       = IPSET_TYPE_IP | IPSET_TYPE_MARK,
 280         .dimension      = IPSET_DIM_TWO,
 281         .family         = NFPROTO_UNSPEC,
 282         .revision_min   = IPSET_TYPE_REV_MIN,
 283         .revision_max   = IPSET_TYPE_REV_MAX,
 284         .create         = hash_ipmark_create,
 285         .create_policy  = {
 286                 [IPSET_ATTR_MARKMASK]   = { .type = NLA_U32 },
 287                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 288                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 289                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
 290                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 291                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 292                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 293         },
 294         .adt_policy     = {
 295                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 296                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 297                 [IPSET_ATTR_MARK]       = { .type = NLA_U32 },
 298                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 299                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 300                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 301                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 302                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 303                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
 304         },
 305         .me             = THIS_MODULE,
 306 };
 307
 308 static int __init
 309 hash_ipmark_init(void)
 310 {
 311         return ip_set_type_register(&hash_ipmark_type);
 312 }
 313
 314 static void __exit
 315 hash_ipmark_fini(void)
 316 {
 317         ip_set_type_unregister(&hash_ipmark_type);
 318 }
 319
 320 module_init(hash_ipmark_init);
 321 module_exit(hash_ipmark_fini);