unix_diag: Dumping all sockets core
Pavel Emelyanov [Thu, 15 Dec 2011 02:44:52 +0000 (02:44 +0000)]
Walk the unix sockets table and fill the core response structure,
which includes type, state and inode.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/unix/diag.c

index 6be16c0..86d85ab 100644 (file)
 #define UNIX_DIAG_PUT(skb, attrtype, attrlen) \
        RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
 
+static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
+               u32 pid, u32 seq, u32 flags, int sk_ino)
+{
+       unsigned char *b = skb_tail_pointer(skb);
+       struct nlmsghdr *nlh;
+       struct unix_diag_msg *rep;
+
+       nlh = NLMSG_PUT(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep));
+       nlh->nlmsg_flags = flags;
+
+       rep = NLMSG_DATA(nlh);
+
+       rep->udiag_family = AF_UNIX;
+       rep->udiag_type = sk->sk_type;
+       rep->udiag_state = sk->sk_state;
+       rep->udiag_ino = sk_ino;
+       sock_diag_save_cookie(sk, rep->udiag_cookie);
+
+       nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+       return skb->len;
+
+nlmsg_failure:
+       nlmsg_trim(skb, b);
+       return -EMSGSIZE;
+}
+
+static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
+               u32 pid, u32 seq, u32 flags)
+{
+       int sk_ino;
+
+       unix_state_lock(sk);
+       sk_ino = sock_i_ino(sk);
+       unix_state_unlock(sk);
+
+       if (!sk_ino)
+               return 0;
+
+       return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino);
+}
+
 static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 {
-       return 0;
+       struct unix_diag_req *req;
+       int num, s_num, slot, s_slot;
+
+       req = NLMSG_DATA(cb->nlh);
+
+       s_slot = cb->args[0];
+       num = s_num = cb->args[1];
+
+       spin_lock(&unix_table_lock);
+       for (slot = s_slot; slot <= UNIX_HASH_SIZE; s_num = 0, slot++) {
+               struct sock *sk;
+               struct hlist_node *node;
+
+               num = 0;
+               sk_for_each(sk, node, &unix_socket_table[slot]) {
+                       if (num < s_num)
+                               goto next;
+                       if (!(req->udiag_states & (1 << sk->sk_state)))
+                               goto next;
+                       if (sk_diag_dump(sk, skb, req,
+                                               NETLINK_CB(cb->skb).pid,
+                                               cb->nlh->nlmsg_seq,
+                                               NLM_F_MULTI) < 0)
+                               goto done;
+next:
+                       num++;
+               }
+       }
+done:
+       spin_unlock(&unix_table_lock);
+       cb->args[0] = slot;
+       cb->args[1] = num;
+
+       return skb->len;
 }
 
 static int unix_diag_get_exact(struct sk_buff *in_skb,