net/netlabel/netlabel_addrlist.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * NetLabel Network Address Lists
   4  *
   5  * This file contains network address list functions used to manage ordered
   6  * lists of network addresses for use by the NetLabel subsystem.  The NetLabel
   7  * system manages static and dynamic label mappings for network protocols such
   8  * as CIPSO and RIPSO.
   9  *
  10  * Author: Paul Moore <paul@paul-moore.com>
  11  */
  12
  13 /*
  14  * (c) Copyright Hewlett-Packard Development Company, L.P., 2008
  15  */
  16
  17 #ifndef _NETLABEL_ADDRLIST_H
  18 #define _NETLABEL_ADDRLIST_H
  19
  20 #include <linux/types.h>
  21 #include <linux/rcupdate.h>
  22 #include <linux/list.h>
  23 #include <linux/in6.h>
  24 #include <linux/audit.h>
  25
  26 /**
  27  * struct netlbl_af4list - NetLabel IPv4 address list
  28  * @addr: IPv4 address
  29  * @mask: IPv4 address mask
  30  * @valid: valid flag
  31  * @list: list structure, used internally
  32  */
  33 struct netlbl_af4list {
  34         __be32 addr;
  35         __be32 mask;
  36
  37         u32 valid;
  38         struct list_head list;
  39 };
  40
  41 /**
  42  * struct netlbl_af6list - NetLabel IPv6 address list
  43  * @addr: IPv6 address
  44  * @mask: IPv6 address mask
  45  * @valid: valid flag
  46  * @list: list structure, used internally
  47  */
  48 struct netlbl_af6list {
  49         struct in6_addr addr;
  50         struct in6_addr mask;
  51
  52         u32 valid;
  53         struct list_head list;
  54 };
  55
  56 #define __af4list_entry(ptr) container_of(ptr, struct netlbl_af4list, list)
  57
  58 static inline struct netlbl_af4list *__af4list_valid(struct list_head *s,
  59                                                      struct list_head *h)
  60 {
  61         struct list_head *i = s;
  62         struct netlbl_af4list *n = __af4list_entry(s);
  63         while (i != h && !n->valid) {
  64                 i = i->next;
  65                 n = __af4list_entry(i);
  66         }
  67         return n;
  68 }
  69
  70 static inline struct netlbl_af4list *__af4list_valid_rcu(struct list_head *s,
  71                                                          struct list_head *h)
  72 {
  73         struct list_head *i = s;
  74         struct netlbl_af4list *n = __af4list_entry(s);
  75         while (i != h && !n->valid) {
  76                 i = rcu_dereference(list_next_rcu(i));
  77                 n = __af4list_entry(i);
  78         }
  79         return n;
  80 }
  81
  82 #define netlbl_af4list_foreach(iter, head)                              \
  83         for (iter = __af4list_valid((head)->next, head);                \
  84              &iter->list != (head);                                     \
  85              iter = __af4list_valid(iter->list.next, head))
  86
  87 #define netlbl_af4list_foreach_rcu(iter, head)                          \
  88         for (iter = __af4list_valid_rcu((head)->next, head);            \
  89              &iter->list != (head);                                     \
  90              iter = __af4list_valid_rcu(iter->list.next, head))
  91
  92 #define netlbl_af4list_foreach_safe(iter, tmp, head)                    \
  93         for (iter = __af4list_valid((head)->next, head),                \
  94                      tmp = __af4list_valid(iter->list.next, head);      \
  95              &iter->list != (head);                                     \
  96              iter = tmp, tmp = __af4list_valid(iter->list.next, head))
  97
  98 int netlbl_af4list_add(struct netlbl_af4list *entry,
  99                        struct list_head *head);
 100 struct netlbl_af4list *netlbl_af4list_remove(__be32 addr, __be32 mask,
 101                                              struct list_head *head);
 102 void netlbl_af4list_remove_entry(struct netlbl_af4list *entry);
 103 struct netlbl_af4list *netlbl_af4list_search(__be32 addr,
 104                                              struct list_head *head);
 105 struct netlbl_af4list *netlbl_af4list_search_exact(__be32 addr,
 106                                                    __be32 mask,
 107                                                    struct list_head *head);
 108
 109 #ifdef CONFIG_AUDIT
 110 void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
 111                                int src, const char *dev,
 112                                __be32 addr, __be32 mask);
 113 #else
 114 static inline void netlbl_af4list_audit_addr(struct audit_buffer *audit_buf,
 115                                              int src, const char *dev,
 116                                              __be32 addr, __be32 mask)
 117 {
 118 }
 119 #endif
 120
 121 #if IS_ENABLED(CONFIG_IPV6)
 122
 123 #define __af6list_entry(ptr) container_of(ptr, struct netlbl_af6list, list)
 124
 125 static inline struct netlbl_af6list *__af6list_valid(struct list_head *s,
 126                                                      struct list_head *h)
 127 {
 128         struct list_head *i = s;
 129         struct netlbl_af6list *n = __af6list_entry(s);
 130         while (i != h && !n->valid) {
 131                 i = i->next;
 132                 n = __af6list_entry(i);
 133         }
 134         return n;
 135 }
 136
 137 static inline struct netlbl_af6list *__af6list_valid_rcu(struct list_head *s,
 138                                                          struct list_head *h)
 139 {
 140         struct list_head *i = s;
 141         struct netlbl_af6list *n = __af6list_entry(s);
 142         while (i != h && !n->valid) {
 143                 i = rcu_dereference(list_next_rcu(i));
 144                 n = __af6list_entry(i);
 145         }
 146         return n;
 147 }
 148
 149 #define netlbl_af6list_foreach(iter, head)                              \
 150         for (iter = __af6list_valid((head)->next, head);                \
 151              &iter->list != (head);                                     \
 152              iter = __af6list_valid(iter->list.next, head))
 153
 154 #define netlbl_af6list_foreach_rcu(iter, head)                          \
 155         for (iter = __af6list_valid_rcu((head)->next, head);            \
 156              &iter->list != (head);                                     \
 157              iter = __af6list_valid_rcu(iter->list.next, head))
 158
 159 #define netlbl_af6list_foreach_safe(iter, tmp, head)                    \
 160         for (iter = __af6list_valid((head)->next, head),                \
 161                      tmp = __af6list_valid(iter->list.next, head);      \
 162              &iter->list != (head);                                     \
 163              iter = tmp, tmp = __af6list_valid(iter->list.next, head))
 164
 165 int netlbl_af6list_add(struct netlbl_af6list *entry,
 166                        struct list_head *head);
 167 struct netlbl_af6list *netlbl_af6list_remove(const struct in6_addr *addr,
 168                                              const struct in6_addr *mask,
 169                                              struct list_head *head);
 170 void netlbl_af6list_remove_entry(struct netlbl_af6list *entry);
 171 struct netlbl_af6list *netlbl_af6list_search(const struct in6_addr *addr,
 172                                              struct list_head *head);
 173 struct netlbl_af6list *netlbl_af6list_search_exact(const struct in6_addr *addr,
 174                                                    const struct in6_addr *mask,
 175                                                    struct list_head *head);
 176
 177 #ifdef CONFIG_AUDIT
 178 void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
 179                                int src,
 180                                const char *dev,
 181                                const struct in6_addr *addr,
 182                                const struct in6_addr *mask);
 183 #else
 184 static inline void netlbl_af6list_audit_addr(struct audit_buffer *audit_buf,
 185                                              int src,
 186                                              const char *dev,
 187                                              const struct in6_addr *addr,
 188                                              const struct in6_addr *mask)
 189 {
 190 }
 191 #endif
 192 #endif /* IPV6 */
 193
 194 #endif