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