net/netfilter/ipset/ip_set_hash_ipport.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
   3
   4 /* Kernel module implementing an IP set type: the hash:ip,port type */
   5
   6 #include <linux/jhash.h>
   7 #include <linux/module.h>
   8 #include <linux/ip.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/errno.h>
  11 #include <linux/random.h>
  12 #include <net/ip.h>
  13 #include <net/ipv6.h>
  14 #include <net/netlink.h>
  15 #include <net/tcp.h>
  16
  17 #include <linux/netfilter.h>
  18 #include <linux/netfilter/ipset/pfxlen.h>
  19 #include <linux/netfilter/ipset/ip_set.h>
  20 #include <linux/netfilter/ipset/ip_set_getport.h>
  21 #include <linux/netfilter/ipset/ip_set_hash.h>
  22
  23 #define IPSET_TYPE_REV_MIN      0
  24 /*                              1    SCTP and UDPLITE support added */
  25 /*                              2    Counters support added */
  26 /*                              3    Comments support added */
  27 /*                              4    Forceadd support added */
  28 /*                              5    skbinfo support added */
  29 /*                              6    bucketsize, initval support added */
  30 #define IPSET_TYPE_REV_MAX      7 /* bitmask support added */
  31
  32 MODULE_LICENSE("GPL");
  33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
  34 IP_SET_MODULE_DESC("hash:ip,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
  35 MODULE_ALIAS("ip_set_hash:ip,port");
  36
  37 /* Type specific function prefix */
  38 #define HTYPE           hash_ipport
  39 #define IP_SET_HASH_WITH_NETMASK
  40 #define IP_SET_HASH_WITH_BITMASK
  41
  42 /* IPv4 variant */
  43
  44 /* Member elements */
  45 struct hash_ipport4_elem {
  46         __be32 ip;
  47         __be16 port;
  48         u8 proto;
  49         u8 padding;
  50 };
  51
  52 /* Common functions */
  53
  54 static bool
  55 hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1,
  56                         const struct hash_ipport4_elem *ip2,
  57                         u32 *multi)
  58 {
  59         return ip1->ip == ip2->ip &&
  60                ip1->port == ip2->port &&
  61                ip1->proto == ip2->proto;
  62 }
  63
  64 static bool
  65 hash_ipport4_data_list(struct sk_buff *skb,
  66                        const struct hash_ipport4_elem *data)
  67 {
  68         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
  69             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
  70             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
  71                 goto nla_put_failure;
  72         return false;
  73
  74 nla_put_failure:
  75         return true;
  76 }
  77
  78 static void
  79 hash_ipport4_data_next(struct hash_ipport4_elem *next,
  80                        const struct hash_ipport4_elem *d)
  81 {
  82         next->ip = d->ip;
  83         next->port = d->port;
  84 }
  85
  86 #define MTYPE           hash_ipport4
  87 #define HOST_MASK       32
  88 #include "ip_set_hash_gen.h"
  89
  90 static int
  91 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
  92                   const struct xt_action_param *par,
  93                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
  94 {
  95         ipset_adtfn adtfn = set->variant->adt[adt];
  96         struct hash_ipport4_elem e = { .ip = 0 };
  97         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
  98         const struct MTYPE *h = set->data;
  99
 100         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 101                                  &e.port, &e.proto))
 102                 return -EINVAL;
 103
 104         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 105         e.ip &= h->bitmask.ip;
 106         if (e.ip == 0)
 107                 return -EINVAL;
 108         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 109 }
 110
 111 static int
 112 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
 113                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 114 {
 115         struct hash_ipport4 *h = set->data;
 116         ipset_adtfn adtfn = set->variant->adt[adt];
 117         struct hash_ipport4_elem e = { .ip = 0 };
 118         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 119         u32 ip, ip_to = 0, p = 0, port, port_to, i = 0;
 120         bool with_ports = false;
 121         int ret;
 122
 123         if (tb[IPSET_ATTR_LINENO])
 124                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 125
 126         if (unlikely(!tb[IPSET_ATTR_IP] ||
 127                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 128                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
 129                 return -IPSET_ERR_PROTOCOL;
 130
 131         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
 132         if (ret)
 133                 return ret;
 134
 135         ret = ip_set_get_extensions(set, tb, &ext);
 136         if (ret)
 137                 return ret;
 138
 139         e.ip &= h->bitmask.ip;
 140         if (e.ip == 0)
 141                 return -EINVAL;
 142
 143         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 144
 145         if (tb[IPSET_ATTR_PROTO]) {
 146                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 147                 with_ports = ip_set_proto_with_ports(e.proto);
 148
 149                 if (e.proto == 0)
 150                         return -IPSET_ERR_INVALID_PROTO;
 151         } else {
 152                 return -IPSET_ERR_MISSING_PROTO;
 153         }
 154
 155         if (!(with_ports || e.proto == IPPROTO_ICMP))
 156                 e.port = 0;
 157
 158         if (adt == IPSET_TEST ||
 159             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
 160               tb[IPSET_ATTR_PORT_TO])) {
 161                 ret = adtfn(set, &e, &ext, &ext, flags);
 162                 return ip_set_eexist(ret, flags) ? 0 : ret;
 163         }
 164
 165         ip_to = ip = ntohl(e.ip);
 166         if (tb[IPSET_ATTR_IP_TO]) {
 167                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
 168                 if (ret)
 169                         return ret;
 170                 if (ip > ip_to)
 171                         swap(ip, ip_to);
 172         } else if (tb[IPSET_ATTR_CIDR]) {
 173                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 174
 175                 if (!cidr || cidr > HOST_MASK)
 176                         return -IPSET_ERR_INVALID_CIDR;
 177                 ip_set_mask_from_to(ip, ip_to, cidr);
 178         }
 179
 180         port_to = port = ntohs(e.port);
 181         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
 182                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 183                 if (port > port_to)
 184                         swap(port, port_to);
 185         }
 186
 187         if (retried)
 188                 ip = ntohl(h->next.ip);
 189         for (; ip <= ip_to; ip++) {
 190                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
 191                                                        : port;
 192                 for (; p <= port_to; p++, i++) {
 193                         e.ip = htonl(ip);
 194                         e.port = htons(p);
 195                         if (i > IPSET_MAX_RANGE) {
 196                                 hash_ipport4_data_next(&h->next, &e);
 197                                 return -ERANGE;
 198                         }
 199                         ret = adtfn(set, &e, &ext, &ext, flags);
 200
 201                         if (ret && !ip_set_eexist(ret, flags))
 202                                 return ret;
 203
 204                         ret = 0;
 205                 }
 206         }
 207         return ret;
 208 }
 209
 210 /* IPv6 variant */
 211
 212 struct hash_ipport6_elem {
 213         union nf_inet_addr ip;
 214         __be16 port;
 215         u8 proto;
 216         u8 padding;
 217 };
 218
 219 /* Common functions */
 220
 221 static bool
 222 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
 223                         const struct hash_ipport6_elem *ip2,
 224                         u32 *multi)
 225 {
 226         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
 227                ip1->port == ip2->port &&
 228                ip1->proto == ip2->proto;
 229 }
 230
 231 static bool
 232 hash_ipport6_data_list(struct sk_buff *skb,
 233                        const struct hash_ipport6_elem *data)
 234 {
 235         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
 236             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 237             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 238                 goto nla_put_failure;
 239         return false;
 240
 241 nla_put_failure:
 242         return true;
 243 }
 244
 245 static void
 246 hash_ipport6_data_next(struct hash_ipport6_elem *next,
 247                        const struct hash_ipport6_elem *d)
 248 {
 249         next->port = d->port;
 250 }
 251
 252 #undef MTYPE
 253 #undef HOST_MASK
 254
 255 #define MTYPE           hash_ipport6
 256 #define HOST_MASK       128
 257 #define IP_SET_EMIT_CREATE
 258 #include "ip_set_hash_gen.h"
 259
 260 static int
 261 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
 262                   const struct xt_action_param *par,
 263                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
 264 {
 265         ipset_adtfn adtfn = set->variant->adt[adt];
 266         struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
 267         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 268         const struct MTYPE *h = set->data;
 269
 270         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
 271                                  &e.port, &e.proto))
 272                 return -EINVAL;
 273
 274         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
 275         nf_inet_addr_mask_inplace(&e.ip, &h->bitmask);
 276         if (ipv6_addr_any(&e.ip.in6))
 277                 return -EINVAL;
 278
 279         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 280 }
 281
 282 static int
 283 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
 284                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 285 {
 286         const struct hash_ipport6 *h = set->data;
 287         ipset_adtfn adtfn = set->variant->adt[adt];
 288         struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
 289         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
 290         u32 port, port_to;
 291         bool with_ports = false;
 292         int ret;
 293
 294         if (tb[IPSET_ATTR_LINENO])
 295                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
 296
 297         if (unlikely(!tb[IPSET_ATTR_IP] ||
 298                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
 299                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
 300                 return -IPSET_ERR_PROTOCOL;
 301         if (unlikely(tb[IPSET_ATTR_IP_TO]))
 302                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
 303         if (unlikely(tb[IPSET_ATTR_CIDR])) {
 304                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
 305
 306                 if (cidr != HOST_MASK)
 307                         return -IPSET_ERR_INVALID_CIDR;
 308         }
 309
 310         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
 311         if (ret)
 312                 return ret;
 313
 314         ret = ip_set_get_extensions(set, tb, &ext);
 315         if (ret)
 316                 return ret;
 317
 318         nf_inet_addr_mask_inplace(&e.ip, &h->bitmask);
 319         if (ipv6_addr_any(&e.ip.in6))
 320                 return -EINVAL;
 321
 322         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
 323
 324         if (tb[IPSET_ATTR_PROTO]) {
 325                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
 326                 with_ports = ip_set_proto_with_ports(e.proto);
 327
 328                 if (e.proto == 0)
 329                         return -IPSET_ERR_INVALID_PROTO;
 330         } else {
 331                 return -IPSET_ERR_MISSING_PROTO;
 332         }
 333
 334         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
 335                 e.port = 0;
 336
 337         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
 338                 ret = adtfn(set, &e, &ext, &ext, flags);
 339                 return ip_set_eexist(ret, flags) ? 0 : ret;
 340         }
 341
 342         port = ntohs(e.port);
 343         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
 344         if (port > port_to)
 345                 swap(port, port_to);
 346
 347         if (retried)
 348                 port = ntohs(h->next.port);
 349         for (; port <= port_to; port++) {
 350                 e.port = htons(port);
 351                 ret = adtfn(set, &e, &ext, &ext, flags);
 352
 353                 if (ret && !ip_set_eexist(ret, flags))
 354                         return ret;
 355
 356                 ret = 0;
 357         }
 358         return ret;
 359 }
 360
 361 static struct ip_set_type hash_ipport_type __read_mostly = {
 362         .name           = "hash:ip,port",
 363         .protocol       = IPSET_PROTOCOL,
 364         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT,
 365         .dimension      = IPSET_DIM_TWO,
 366         .family         = NFPROTO_UNSPEC,
 367         .revision_min   = IPSET_TYPE_REV_MIN,
 368         .revision_max   = IPSET_TYPE_REV_MAX,
 369         .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
 370         .create         = hash_ipport_create,
 371         .create_policy  = {
 372                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
 373                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
 374                 [IPSET_ATTR_INITVAL]    = { .type = NLA_U32 },
 375                 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
 376                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
 377                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 378                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 379                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
 380                 [IPSET_ATTR_NETMASK]    = { .type = NLA_U8 },
 381                 [IPSET_ATTR_BITMASK]    = { .type = NLA_NESTED },
 382         },
 383         .adt_policy     = {
 384                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
 385                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
 386                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
 387                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
 388                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
 389                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
 390                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
 391                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
 392                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
 393                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
 394                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
 395                                             .len  = IPSET_MAX_COMMENT_SIZE },
 396                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
 397                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
 398                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
 399         },
 400         .me             = THIS_MODULE,
 401 };
 402
 403 static int __init
 404 hash_ipport_init(void)
 405 {
 406         return ip_set_type_register(&hash_ipport_type);
 407 }
 408
 409 static void __exit
 410 hash_ipport_fini(void)
 411 {
 412         rcu_barrier();
 413         ip_set_type_unregister(&hash_ipport_type);
 414 }
 415
 416 module_init(hash_ipport_init);
 417 module_exit(hash_ipport_fini);