include/linux/sock_diag.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __SOCK_DIAG_H__
   3 #define __SOCK_DIAG_H__
   4
   5 #include <linux/netlink.h>
   6 #include <linux/user_namespace.h>
   7 #include <net/net_namespace.h>
   8 #include <net/sock.h>
   9 #include <uapi/linux/sock_diag.h>
  10
  11 struct sk_buff;
  12 struct nlmsghdr;
  13 struct sock;
  14
  15 struct sock_diag_handler {
  16         struct module *owner;
  17         __u8 family;
  18         int (*dump)(struct sk_buff *skb, struct nlmsghdr *nlh);
  19         int (*get_info)(struct sk_buff *skb, struct sock *sk);
  20         int (*destroy)(struct sk_buff *skb, struct nlmsghdr *nlh);
  21 };
  22
  23 int sock_diag_register(const struct sock_diag_handler *h);
  24 void sock_diag_unregister(const struct sock_diag_handler *h);
  25
  26 struct sock_diag_inet_compat {
  27         struct module *owner;
  28         int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh);
  29 };
  30
  31 void sock_diag_register_inet_compat(const struct sock_diag_inet_compat *ptr);
  32 void sock_diag_unregister_inet_compat(const struct sock_diag_inet_compat *ptr);
  33
  34 u64 __sock_gen_cookie(struct sock *sk);
  35
  36 static inline u64 sock_gen_cookie(struct sock *sk)
  37 {
  38         u64 cookie;
  39
  40         preempt_disable();
  41         cookie = __sock_gen_cookie(sk);
  42         preempt_enable();
  43
  44         return cookie;
  45 }
  46
  47 int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie);
  48 void sock_diag_save_cookie(struct sock *sk, __u32 *cookie);
  49
  50 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attr);
  51 int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
  52                              struct sk_buff *skb, int attrtype);
  53
  54 static inline
  55 enum sknetlink_groups sock_diag_destroy_group(const struct sock *sk)
  56 {
  57         switch (sk->sk_family) {
  58         case AF_INET:
  59                 if (sk->sk_type == SOCK_RAW)
  60                         return SKNLGRP_NONE;
  61
  62                 switch (sk->sk_protocol) {
  63                 case IPPROTO_TCP:
  64                         return SKNLGRP_INET_TCP_DESTROY;
  65                 case IPPROTO_UDP:
  66                         return SKNLGRP_INET_UDP_DESTROY;
  67                 default:
  68                         return SKNLGRP_NONE;
  69                 }
  70         case AF_INET6:
  71                 if (sk->sk_type == SOCK_RAW)
  72                         return SKNLGRP_NONE;
  73
  74                 switch (sk->sk_protocol) {
  75                 case IPPROTO_TCP:
  76                         return SKNLGRP_INET6_TCP_DESTROY;
  77                 case IPPROTO_UDP:
  78                         return SKNLGRP_INET6_UDP_DESTROY;
  79                 default:
  80                         return SKNLGRP_NONE;
  81                 }
  82         default:
  83                 return SKNLGRP_NONE;
  84         }
  85 }
  86
  87 static inline
  88 bool sock_diag_has_destroy_listeners(const struct sock *sk)
  89 {
  90         const struct net *n = sock_net(sk);
  91         const enum sknetlink_groups group = sock_diag_destroy_group(sk);
  92
  93         return group != SKNLGRP_NONE && n->diag_nlsk &&
  94                 netlink_has_listeners(n->diag_nlsk, group);
  95 }
  96 void sock_diag_broadcast_destroy(struct sock *sk);
  97
  98 int sock_diag_destroy(struct sock *sk, int err);
  99 #endif