332 lines
7.1 KiB
C
332 lines
7.1 KiB
C
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/sock_diag.h>
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#include <linux/unix_diag.h>
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <net/netlink.h>
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#include <net/af_unix.h>
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#include <net/tcp_states.h>
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static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
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{
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/* might or might not have unix_table_lock */
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struct unix_address *addr = smp_load_acquire(&unix_sk(sk)->addr);
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if (!addr)
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return 0;
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return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
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addr->name->sun_path);
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}
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static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
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{
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struct dentry *dentry = unix_sk(sk)->path.dentry;
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if (dentry) {
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struct unix_diag_vfs uv = {
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.udiag_vfs_ino = d_backing_inode(dentry)->i_ino,
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.udiag_vfs_dev = dentry->d_sb->s_dev,
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};
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return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
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}
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return 0;
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}
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static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
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{
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struct sock *peer;
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int ino;
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peer = unix_peer_get(sk);
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if (peer) {
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unix_state_lock(peer);
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ino = sock_i_ino(peer);
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unix_state_unlock(peer);
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sock_put(peer);
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return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
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}
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return 0;
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}
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static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
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{
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struct sk_buff *skb;
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struct nlattr *attr;
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u32 *buf;
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int i;
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if (sk->sk_state == TCP_LISTEN) {
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spin_lock(&sk->sk_receive_queue.lock);
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attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
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sk->sk_receive_queue.qlen * sizeof(u32));
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if (!attr)
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goto errout;
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buf = nla_data(attr);
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i = 0;
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skb_queue_walk(&sk->sk_receive_queue, skb) {
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struct sock *req, *peer;
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req = skb->sk;
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/*
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* The state lock is outer for the same sk's
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* queue lock. With the other's queue locked it's
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* OK to lock the state.
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*/
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unix_state_lock_nested(req);
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peer = unix_sk(req)->peer;
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buf[i++] = (peer ? sock_i_ino(peer) : 0);
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unix_state_unlock(req);
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}
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spin_unlock(&sk->sk_receive_queue.lock);
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}
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return 0;
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errout:
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spin_unlock(&sk->sk_receive_queue.lock);
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return -EMSGSIZE;
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}
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static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
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{
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struct unix_diag_rqlen rql;
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if (sk->sk_state == TCP_LISTEN) {
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rql.udiag_rqueue = sk->sk_receive_queue.qlen;
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rql.udiag_wqueue = sk->sk_max_ack_backlog;
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} else {
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rql.udiag_rqueue = (u32) unix_inq_len(sk);
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rql.udiag_wqueue = (u32) unix_outq_len(sk);
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}
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return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
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}
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static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
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u32 portid, u32 seq, u32 flags, int sk_ino)
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{
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struct nlmsghdr *nlh;
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struct unix_diag_msg *rep;
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nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
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flags);
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if (!nlh)
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return -EMSGSIZE;
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rep = nlmsg_data(nlh);
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rep->udiag_family = AF_UNIX;
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rep->udiag_type = sk->sk_type;
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rep->udiag_state = sk->sk_state;
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rep->pad = 0;
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rep->udiag_ino = sk_ino;
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sock_diag_save_cookie(sk, rep->udiag_cookie);
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if ((req->udiag_show & UDIAG_SHOW_NAME) &&
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sk_diag_dump_name(sk, skb))
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goto out_nlmsg_trim;
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if ((req->udiag_show & UDIAG_SHOW_VFS) &&
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sk_diag_dump_vfs(sk, skb))
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goto out_nlmsg_trim;
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if ((req->udiag_show & UDIAG_SHOW_PEER) &&
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sk_diag_dump_peer(sk, skb))
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goto out_nlmsg_trim;
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if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
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sk_diag_dump_icons(sk, skb))
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goto out_nlmsg_trim;
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if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
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sk_diag_show_rqlen(sk, skb))
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goto out_nlmsg_trim;
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if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
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sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
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goto out_nlmsg_trim;
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if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
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goto out_nlmsg_trim;
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nlmsg_end(skb, nlh);
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return 0;
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out_nlmsg_trim:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
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u32 portid, u32 seq, u32 flags)
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{
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int sk_ino;
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unix_state_lock(sk);
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sk_ino = sock_i_ino(sk);
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unix_state_unlock(sk);
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if (!sk_ino)
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return 0;
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return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
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}
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static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct unix_diag_req *req;
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int num, s_num, slot, s_slot;
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struct net *net = sock_net(skb->sk);
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req = nlmsg_data(cb->nlh);
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s_slot = cb->args[0];
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num = s_num = cb->args[1];
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spin_lock(&unix_table_lock);
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for (slot = s_slot;
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slot < ARRAY_SIZE(unix_socket_table);
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s_num = 0, slot++) {
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struct sock *sk;
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num = 0;
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sk_for_each(sk, &unix_socket_table[slot]) {
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if (!net_eq(sock_net(sk), net))
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continue;
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if (num < s_num)
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goto next;
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if (!(req->udiag_states & (1 << sk->sk_state)))
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goto next;
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if (sk_diag_dump(sk, skb, req,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq,
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NLM_F_MULTI) < 0)
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goto done;
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next:
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num++;
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}
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}
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done:
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spin_unlock(&unix_table_lock);
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cb->args[0] = slot;
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cb->args[1] = num;
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return skb->len;
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}
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static struct sock *unix_lookup_by_ino(unsigned int ino)
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{
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int i;
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struct sock *sk;
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spin_lock(&unix_table_lock);
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for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
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sk_for_each(sk, &unix_socket_table[i])
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if (ino == sock_i_ino(sk)) {
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sock_hold(sk);
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spin_unlock(&unix_table_lock);
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return sk;
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}
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}
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spin_unlock(&unix_table_lock);
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return NULL;
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}
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static int unix_diag_get_exact(struct sk_buff *in_skb,
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const struct nlmsghdr *nlh,
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struct unix_diag_req *req)
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{
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int err = -EINVAL;
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struct sock *sk;
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struct sk_buff *rep;
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unsigned int extra_len;
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struct net *net = sock_net(in_skb->sk);
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if (req->udiag_ino == 0)
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goto out_nosk;
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sk = unix_lookup_by_ino(req->udiag_ino);
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err = -ENOENT;
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if (sk == NULL)
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goto out_nosk;
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if (!net_eq(sock_net(sk), net))
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goto out;
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err = sock_diag_check_cookie(sk, req->udiag_cookie);
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if (err)
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goto out;
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extra_len = 256;
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again:
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err = -ENOMEM;
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rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
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if (!rep)
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goto out;
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err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
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nlh->nlmsg_seq, 0, req->udiag_ino);
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if (err < 0) {
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nlmsg_free(rep);
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extra_len += 256;
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if (extra_len >= PAGE_SIZE)
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goto out;
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goto again;
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}
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err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
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MSG_DONTWAIT);
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if (err > 0)
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err = 0;
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out:
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if (sk)
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sock_put(sk);
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out_nosk:
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return err;
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}
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static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
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{
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int hdrlen = sizeof(struct unix_diag_req);
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struct net *net = sock_net(skb->sk);
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if (nlmsg_len(h) < hdrlen)
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return -EINVAL;
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if (h->nlmsg_flags & NLM_F_DUMP) {
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struct netlink_dump_control c = {
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.dump = unix_diag_dump,
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};
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return netlink_dump_start(net->diag_nlsk, skb, h, &c);
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} else
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return unix_diag_get_exact(skb, h, nlmsg_data(h));
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}
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static const struct sock_diag_handler unix_diag_handler = {
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.family = AF_UNIX,
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.dump = unix_diag_handler_dump,
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};
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static int __init unix_diag_init(void)
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{
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return sock_diag_register(&unix_diag_handler);
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}
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static void __exit unix_diag_exit(void)
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{
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sock_diag_unregister(&unix_diag_handler);
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}
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module_init(unix_diag_init);
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module_exit(unix_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);
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