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
  30 static inline u64 sock_gen_cookie(struct sock *sk)
  31 {
  32         u64 cookie;
  33
  34         preempt_disable();
  35         cookie = __sock_gen_cookie(sk);
  36         preempt_enable();
  37
  38         return cookie;
  39 }
  40
  41 int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie);
  42 void sock_diag_save_cookie(struct sock *sk, __u32 *cookie);
  43
  44 int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attr);
  45 int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
  46                              struct sk_buff *skb, int attrtype);
  47
  48 static inline
  49 enum sknetlink_groups sock_diag_destroy_group(const struct sock *sk)
  50 {
  51         switch (sk->sk_family) {
  52         case AF_INET:
  53                 if (sk->sk_type == SOCK_RAW)
  54                         return SKNLGRP_NONE;
  55
  56                 switch (sk->sk_protocol) {
  57                 case IPPROTO_TCP:
  58                         return SKNLGRP_INET_TCP_DESTROY;
  59                 case IPPROTO_UDP:
  60                         return SKNLGRP_INET_UDP_DESTROY;
  61                 default:
  62                         return SKNLGRP_NONE;
  63                 }
  64         case AF_INET6:
  65                 if (sk->sk_type == SOCK_RAW)
  66                         return SKNLGRP_NONE;
  67
  68                 switch (sk->sk_protocol) {
  69                 case IPPROTO_TCP:
  70                         return SKNLGRP_INET6_TCP_DESTROY;
  71                 case IPPROTO_UDP:
  72                         return SKNLGRP_INET6_UDP_DESTROY;
  73                 default:
  74                         return SKNLGRP_NONE;
  75                 }
  76         default:
  77                 return SKNLGRP_NONE;
  78         }
  79 }
  80
  81 static inline
  82 bool sock_diag_has_destroy_listeners(const struct sock *sk)
  83 {
  84         const struct net *n = sock_net(sk);
  85         const enum sknetlink_groups group = sock_diag_destroy_group(sk);
  86
  87         return group != SKNLGRP_NONE && n->diag_nlsk &&
  88                 netlink_has_listeners(n->diag_nlsk, group);
  89 }
  90 void sock_diag_broadcast_destroy(struct sock *sk);
  91
  92 int sock_diag_destroy(struct sock *sk, int err);
  93 #endif