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         __u8 family;
  17         int (*dump)(struct sk_buff *skb, struct nlmsghdr *nlh);
  18         int (*get_info)(struct sk_buff *skb, struct sock *sk);
  19         int (*destroy)(struct sk_buff *skb, struct nlmsghdr *nlh);
  20 };
  21
  22 int sock_diag_register(const struct sock_diag_handler *h);
  23 void sock_diag_unregister(const struct sock_diag_handler *h);
  24
  25 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh));
  26 void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh));
  27
  28 u64 sock_gen_cookie(struct sock *sk);
  29 int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie);
  30 void sock_diag_save_cookie(struct sock *sk, __u32 *cookie);
  31
  32 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attr);
  33 int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
  34                              struct sk_buff *skb, int attrtype);
  35
  36 static inline
  37 enum sknetlink_groups sock_diag_destroy_group(const struct sock *sk)
  38 {
  39         switch (sk->sk_family) {
  40         case AF_INET:
  41                 if (sk->sk_type == SOCK_RAW)
  42                         return SKNLGRP_NONE;
  43
  44                 switch (sk->sk_protocol) {
  45                 case IPPROTO_TCP:
  46                         return SKNLGRP_INET_TCP_DESTROY;
  47                 case IPPROTO_UDP:
  48                         return SKNLGRP_INET_UDP_DESTROY;
  49                 default:
  50                         return SKNLGRP_NONE;
  51                 }
  52         case AF_INET6:
  53                 if (sk->sk_type == SOCK_RAW)
  54                         return SKNLGRP_NONE;
  55
  56                 switch (sk->sk_protocol) {
  57                 case IPPROTO_TCP:
  58                         return SKNLGRP_INET6_TCP_DESTROY;
  59                 case IPPROTO_UDP:
  60                         return SKNLGRP_INET6_UDP_DESTROY;
  61                 default:
  62                         return SKNLGRP_NONE;
  63                 }
  64         default:
  65                 return SKNLGRP_NONE;
  66         }
  67 }
  68
  69 static inline
  70 bool sock_diag_has_destroy_listeners(const struct sock *sk)
  71 {
  72         const struct net *n = sock_net(sk);
  73         const enum sknetlink_groups group = sock_diag_destroy_group(sk);
  74
  75         return group != SKNLGRP_NONE && n->diag_nlsk &&
  76                 netlink_has_listeners(n->diag_nlsk, group);
  77 }
  78 void sock_diag_broadcast_destroy(struct sock *sk);
  79
  80 int sock_diag_destroy(struct sock *sk, int err);
  81 #endif