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Linux/net/netfilter/ipset/ip_set_hash_ipmark.c

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  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,mark 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_hash.h>
 21 
 22 #define IPSET_TYPE_REV_MIN      0
 23 /*                              1          Forceadd support */
 24 #define IPSET_TYPE_REV_MAX      2       /* skbinfo support  */
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("Vytas Dauksa <vytas.dauksa@smoothwall.net>");
 28 IP_SET_MODULE_DESC("hash:ip,mark", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 29 MODULE_ALIAS("ip_set_hash:ip,mark");
 30 
 31 /* Type specific function prefix */
 32 #define HTYPE           hash_ipmark
 33 #define IP_SET_HASH_WITH_MARKMASK
 34 
 35 /* IPv4 variant */
 36 
 37 /* Member elements */
 38 struct hash_ipmark4_elem {
 39         __be32 ip;
 40         __u32 mark;
 41 };
 42 
 43 /* Common functions */
 44 
 45 static bool
 46 hash_ipmark4_data_equal(const struct hash_ipmark4_elem *ip1,
 47                         const struct hash_ipmark4_elem *ip2,
 48                         u32 *multi)
 49 {
 50         return ip1->ip == ip2->ip &&
 51                ip1->mark == ip2->mark;
 52 }
 53 
 54 static bool
 55 hash_ipmark4_data_list(struct sk_buff *skb,
 56                        const struct hash_ipmark4_elem *data)
 57 {
 58         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 59             nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
 60                 goto nla_put_failure;
 61         return false;
 62 
 63 nla_put_failure:
 64         return true;
 65 }
 66 
 67 static void
 68 hash_ipmark4_data_next(struct hash_ipmark4_elem *next,
 69                        const struct hash_ipmark4_elem *d)
 70 {
 71         next->ip = d->ip;
 72 }
 73 
 74 #define MTYPE           hash_ipmark4
 75 #define HOST_MASK       32
 76 #include "ip_set_hash_gen.h"
 77 
 78 static int
 79 hash_ipmark4_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         const struct hash_ipmark4 *h = set->data;
 84         ipset_adtfn adtfn = set->variant->adt[adt];
 85         struct hash_ipmark4_elem e = { };
 86         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 87 
 88         e.mark = skb->mark;
 89         e.mark &= h->markmask;
 90 
 91         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
 92         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 93 }
 94 
 95 static int
 96 hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
 97                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
 98 {
 99         const struct hash_ipmark4 *h = set->data;
100         ipset_adtfn adtfn = set->variant->adt[adt];
101         struct hash_ipmark4_elem e = { };
102         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
103         u32 ip, ip_to = 0;
104         int ret;
105 
106         if (tb[IPSET_ATTR_LINENO])
107                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
108 
109         if (unlikely(!tb[IPSET_ATTR_IP] ||
110                      !ip_set_attr_netorder(tb, IPSET_ATTR_MARK)))
111                 return -IPSET_ERR_PROTOCOL;
112 
113         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
114         if (ret)
115                 return ret;
116 
117         ret = ip_set_get_extensions(set, tb, &ext);
118         if (ret)
119                 return ret;
120 
121         e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK]));
122         e.mark &= h->markmask;
123 
124         if (adt == IPSET_TEST ||
125             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR])) {
126                 ret = adtfn(set, &e, &ext, &ext, flags);
127                 return ip_set_eexist(ret, flags) ? 0 : ret;
128         }
129 
130         ip_to = ip = ntohl(e.ip);
131         if (tb[IPSET_ATTR_IP_TO]) {
132                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
133                 if (ret)
134                         return ret;
135                 if (ip > ip_to)
136                         swap(ip, ip_to);
137         } else if (tb[IPSET_ATTR_CIDR]) {
138                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
139 
140                 if (!cidr || cidr > HOST_MASK)
141                         return -IPSET_ERR_INVALID_CIDR;
142                 ip_set_mask_from_to(ip, ip_to, cidr);
143         }
144 
145         if (retried)
146                 ip = ntohl(h->next.ip);
147         for (; ip <= ip_to; ip++) {
148                 e.ip = htonl(ip);
149                 ret = adtfn(set, &e, &ext, &ext, flags);
150 
151                 if (ret && !ip_set_eexist(ret, flags))
152                         return ret;
153 
154                 ret = 0;
155         }
156         return ret;
157 }
158 
159 /* IPv6 variant */
160 
161 struct hash_ipmark6_elem {
162         union nf_inet_addr ip;
163         __u32 mark;
164 };
165 
166 /* Common functions */
167 
168 static bool
169 hash_ipmark6_data_equal(const struct hash_ipmark6_elem *ip1,
170                         const struct hash_ipmark6_elem *ip2,
171                         u32 *multi)
172 {
173         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
174                ip1->mark == ip2->mark;
175 }
176 
177 static bool
178 hash_ipmark6_data_list(struct sk_buff *skb,
179                        const struct hash_ipmark6_elem *data)
180 {
181         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
182             nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
183                 goto nla_put_failure;
184         return false;
185 
186 nla_put_failure:
187         return true;
188 }
189 
190 static void
191 hash_ipmark6_data_next(struct hash_ipmark6_elem *next,
192                        const struct hash_ipmark6_elem *d)
193 {
194 }
195 
196 #undef MTYPE
197 #undef HOST_MASK
198 
199 #define MTYPE           hash_ipmark6
200 #define HOST_MASK       128
201 #define IP_SET_EMIT_CREATE
202 #include "ip_set_hash_gen.h"
203 
204 static int
205 hash_ipmark6_kadt(struct ip_set *set, const struct sk_buff *skb,
206                   const struct xt_action_param *par,
207                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
208 {
209         const struct hash_ipmark6 *h = set->data;
210         ipset_adtfn adtfn = set->variant->adt[adt];
211         struct hash_ipmark6_elem e = { };
212         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
213 
214         e.mark = skb->mark;
215         e.mark &= h->markmask;
216 
217         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
218         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
219 }
220 
221 static int
222 hash_ipmark6_uadt(struct ip_set *set, struct nlattr *tb[],
223                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
224 {
225         const struct hash_ipmark6 *h = set->data;
226         ipset_adtfn adtfn = set->variant->adt[adt];
227         struct hash_ipmark6_elem e = { };
228         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
229         int ret;
230 
231         if (tb[IPSET_ATTR_LINENO])
232                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
233 
234         if (unlikely(!tb[IPSET_ATTR_IP] ||
235                      !ip_set_attr_netorder(tb, IPSET_ATTR_MARK)))
236                 return -IPSET_ERR_PROTOCOL;
237         if (unlikely(tb[IPSET_ATTR_IP_TO]))
238                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
239         if (unlikely(tb[IPSET_ATTR_CIDR])) {
240                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
241 
242                 if (cidr != HOST_MASK)
243                         return -IPSET_ERR_INVALID_CIDR;
244         }
245 
246         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
247         if (ret)
248                 return ret;
249 
250         ret = ip_set_get_extensions(set, tb, &ext);
251         if (ret)
252                 return ret;
253 
254         e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK]));
255         e.mark &= h->markmask;
256 
257         if (adt == IPSET_TEST) {
258                 ret = adtfn(set, &e, &ext, &ext, flags);
259                 return ip_set_eexist(ret, flags) ? 0 : ret;
260         }
261 
262         ret = adtfn(set, &e, &ext, &ext, flags);
263         if (ret && !ip_set_eexist(ret, flags))
264                 return ret;
265 
266         return 0;
267 }
268 
269 static struct ip_set_type hash_ipmark_type __read_mostly = {
270         .name           = "hash:ip,mark",
271         .protocol       = IPSET_PROTOCOL,
272         .features       = IPSET_TYPE_IP | IPSET_TYPE_MARK,
273         .dimension      = IPSET_DIM_TWO,
274         .family         = NFPROTO_UNSPEC,
275         .revision_min   = IPSET_TYPE_REV_MIN,
276         .revision_max   = IPSET_TYPE_REV_MAX,
277         .create         = hash_ipmark_create,
278         .create_policy  = {
279                 [IPSET_ATTR_MARKMASK]   = { .type = NLA_U32 },
280                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
281                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
282                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
283                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
284                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
285                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
286         },
287         .adt_policy     = {
288                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
289                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
290                 [IPSET_ATTR_MARK]       = { .type = NLA_U32 },
291                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
292                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
293                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
294                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
295                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
296                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
297                                             .len  = IPSET_MAX_COMMENT_SIZE },
298                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
299                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
300                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
301         },
302         .me             = THIS_MODULE,
303 };
304 
305 static int __init
306 hash_ipmark_init(void)
307 {
308         return ip_set_type_register(&hash_ipmark_type);
309 }
310 
311 static void __exit
312 hash_ipmark_fini(void)
313 {
314         rcu_barrier();
315         ip_set_type_unregister(&hash_ipmark_type);
316 }
317 
318 module_init(hash_ipmark_init);
319 module_exit(hash_ipmark_fini);
320 

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