343 lines
7.6 KiB
C
343 lines
7.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/sock_diag.h>
|
||
|
|
#include <linux/unix_diag.h>
|
||
|
|
#include <linux/skbuff.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/uidgid.h>
|
||
|
|
#include <net/netlink.h>
|
||
|
|
#include <net/af_unix.h>
|
||
|
|
#include <net/tcp_states.h>
|
||
|
|
#include <net/sock.h>
|
||
|
|
|
||
|
|
static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
|
||
|
|
{
|
||
|
|
/* might or might not have a hash table lock */
|
||
|
|
struct unix_address *addr = smp_load_acquire(&unix_sk(sk)->addr);
|
||
|
|
|
||
|
|
if (!addr)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return nla_put(nlskb, UNIX_DIAG_NAME,
|
||
|
|
addr->len - offsetof(struct sockaddr_un, sun_path),
|
||
|
|
addr->name->sun_path);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
|
||
|
|
{
|
||
|
|
struct dentry *dentry = unix_sk(sk)->path.dentry;
|
||
|
|
|
||
|
|
if (dentry) {
|
||
|
|
struct unix_diag_vfs uv = {
|
||
|
|
.udiag_vfs_ino = d_backing_inode(dentry)->i_ino,
|
||
|
|
.udiag_vfs_dev = dentry->d_sb->s_dev,
|
||
|
|
};
|
||
|
|
|
||
|
|
return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
|
||
|
|
{
|
||
|
|
struct sock *peer;
|
||
|
|
int ino;
|
||
|
|
|
||
|
|
peer = unix_peer_get(sk);
|
||
|
|
if (peer) {
|
||
|
|
unix_state_lock(peer);
|
||
|
|
ino = sock_i_ino(peer);
|
||
|
|
unix_state_unlock(peer);
|
||
|
|
sock_put(peer);
|
||
|
|
|
||
|
|
return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
|
||
|
|
{
|
||
|
|
struct sk_buff *skb;
|
||
|
|
struct nlattr *attr;
|
||
|
|
u32 *buf;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (sk->sk_state == TCP_LISTEN) {
|
||
|
|
spin_lock(&sk->sk_receive_queue.lock);
|
||
|
|
|
||
|
|
attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
|
||
|
|
sk->sk_receive_queue.qlen * sizeof(u32));
|
||
|
|
if (!attr)
|
||
|
|
goto errout;
|
||
|
|
|
||
|
|
buf = nla_data(attr);
|
||
|
|
i = 0;
|
||
|
|
skb_queue_walk(&sk->sk_receive_queue, skb) {
|
||
|
|
struct sock *req, *peer;
|
||
|
|
|
||
|
|
req = skb->sk;
|
||
|
|
/*
|
||
|
|
* The state lock is outer for the same sk's
|
||
|
|
* queue lock. With the other's queue locked it's
|
||
|
|
* OK to lock the state.
|
||
|
|
*/
|
||
|
|
unix_state_lock_nested(req);
|
||
|
|
peer = unix_sk(req)->peer;
|
||
|
|
buf[i++] = (peer ? sock_i_ino(peer) : 0);
|
||
|
|
unix_state_unlock(req);
|
||
|
|
}
|
||
|
|
spin_unlock(&sk->sk_receive_queue.lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
errout:
|
||
|
|
spin_unlock(&sk->sk_receive_queue.lock);
|
||
|
|
return -EMSGSIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
|
||
|
|
{
|
||
|
|
struct unix_diag_rqlen rql;
|
||
|
|
|
||
|
|
if (sk->sk_state == TCP_LISTEN) {
|
||
|
|
rql.udiag_rqueue = sk->sk_receive_queue.qlen;
|
||
|
|
rql.udiag_wqueue = sk->sk_max_ack_backlog;
|
||
|
|
} else {
|
||
|
|
rql.udiag_rqueue = (u32) unix_inq_len(sk);
|
||
|
|
rql.udiag_wqueue = (u32) unix_outq_len(sk);
|
||
|
|
}
|
||
|
|
|
||
|
|
return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sk_diag_dump_uid(struct sock *sk, struct sk_buff *nlskb,
|
||
|
|
struct user_namespace *user_ns)
|
||
|
|
{
|
||
|
|
uid_t uid = from_kuid_munged(user_ns, sock_i_uid(sk));
|
||
|
|
return nla_put(nlskb, UNIX_DIAG_UID, sizeof(uid_t), &uid);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
|
||
|
|
struct user_namespace *user_ns,
|
||
|
|
u32 portid, u32 seq, u32 flags, int sk_ino)
|
||
|
|
{
|
||
|
|
struct nlmsghdr *nlh;
|
||
|
|
struct unix_diag_msg *rep;
|
||
|
|
|
||
|
|
nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
|
||
|
|
flags);
|
||
|
|
if (!nlh)
|
||
|
|
return -EMSGSIZE;
|
||
|
|
|
||
|
|
rep = nlmsg_data(nlh);
|
||
|
|
rep->udiag_family = AF_UNIX;
|
||
|
|
rep->udiag_type = sk->sk_type;
|
||
|
|
rep->udiag_state = sk->sk_state;
|
||
|
|
rep->pad = 0;
|
||
|
|
rep->udiag_ino = sk_ino;
|
||
|
|
sock_diag_save_cookie(sk, rep->udiag_cookie);
|
||
|
|
|
||
|
|
if ((req->udiag_show & UDIAG_SHOW_NAME) &&
|
||
|
|
sk_diag_dump_name(sk, skb))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
if ((req->udiag_show & UDIAG_SHOW_VFS) &&
|
||
|
|
sk_diag_dump_vfs(sk, skb))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
if ((req->udiag_show & UDIAG_SHOW_PEER) &&
|
||
|
|
sk_diag_dump_peer(sk, skb))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
|
||
|
|
sk_diag_dump_icons(sk, skb))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
|
||
|
|
sk_diag_show_rqlen(sk, skb))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
|
||
|
|
sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
if ((req->udiag_show & UDIAG_SHOW_UID) &&
|
||
|
|
sk_diag_dump_uid(sk, skb, user_ns))
|
||
|
|
goto out_nlmsg_trim;
|
||
|
|
|
||
|
|
nlmsg_end(skb, nlh);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
out_nlmsg_trim:
|
||
|
|
nlmsg_cancel(skb, nlh);
|
||
|
|
return -EMSGSIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
|
||
|
|
struct user_namespace *user_ns,
|
||
|
|
u32 portid, 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, user_ns, portid, seq, flags, sk_ino);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
||
|
|
{
|
||
|
|
struct net *net = sock_net(skb->sk);
|
||
|
|
int num, s_num, slot, s_slot;
|
||
|
|
struct unix_diag_req *req;
|
||
|
|
|
||
|
|
req = nlmsg_data(cb->nlh);
|
||
|
|
|
||
|
|
s_slot = cb->args[0];
|
||
|
|
num = s_num = cb->args[1];
|
||
|
|
|
||
|
|
for (slot = s_slot; slot < UNIX_HASH_SIZE; s_num = 0, slot++) {
|
||
|
|
struct sock *sk;
|
||
|
|
|
||
|
|
num = 0;
|
||
|
|
spin_lock(&net->unx.table.locks[slot]);
|
||
|
|
sk_for_each(sk, &net->unx.table.buckets[slot]) {
|
||
|
|
if (num < s_num)
|
||
|
|
goto next;
|
||
|
|
if (!(req->udiag_states & (1 << sk->sk_state)))
|
||
|
|
goto next;
|
||
|
|
if (sk_diag_dump(sk, skb, req, sk_user_ns(skb->sk),
|
||
|
|
NETLINK_CB(cb->skb).portid,
|
||
|
|
cb->nlh->nlmsg_seq,
|
||
|
|
NLM_F_MULTI) < 0) {
|
||
|
|
spin_unlock(&net->unx.table.locks[slot]);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
next:
|
||
|
|
num++;
|
||
|
|
}
|
||
|
|
spin_unlock(&net->unx.table.locks[slot]);
|
||
|
|
}
|
||
|
|
done:
|
||
|
|
cb->args[0] = slot;
|
||
|
|
cb->args[1] = num;
|
||
|
|
|
||
|
|
return skb->len;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct sock *unix_lookup_by_ino(struct net *net, unsigned int ino)
|
||
|
|
{
|
||
|
|
struct sock *sk;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < UNIX_HASH_SIZE; i++) {
|
||
|
|
spin_lock(&net->unx.table.locks[i]);
|
||
|
|
sk_for_each(sk, &net->unx.table.buckets[i]) {
|
||
|
|
if (ino == sock_i_ino(sk)) {
|
||
|
|
sock_hold(sk);
|
||
|
|
spin_unlock(&net->unx.table.locks[i]);
|
||
|
|
return sk;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
spin_unlock(&net->unx.table.locks[i]);
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int unix_diag_get_exact(struct sk_buff *in_skb,
|
||
|
|
const struct nlmsghdr *nlh,
|
||
|
|
struct unix_diag_req *req)
|
||
|
|
{
|
||
|
|
struct net *net = sock_net(in_skb->sk);
|
||
|
|
unsigned int extra_len;
|
||
|
|
struct sk_buff *rep;
|
||
|
|
struct sock *sk;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = -EINVAL;
|
||
|
|
if (req->udiag_ino == 0)
|
||
|
|
goto out_nosk;
|
||
|
|
|
||
|
|
sk = unix_lookup_by_ino(net, req->udiag_ino);
|
||
|
|
err = -ENOENT;
|
||
|
|
if (sk == NULL)
|
||
|
|
goto out_nosk;
|
||
|
|
|
||
|
|
err = sock_diag_check_cookie(sk, req->udiag_cookie);
|
||
|
|
if (err)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
extra_len = 256;
|
||
|
|
again:
|
||
|
|
err = -ENOMEM;
|
||
|
|
rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
|
||
|
|
if (!rep)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
err = sk_diag_fill(sk, rep, req, sk_user_ns(NETLINK_CB(in_skb).sk),
|
||
|
|
NETLINK_CB(in_skb).portid,
|
||
|
|
nlh->nlmsg_seq, 0, req->udiag_ino);
|
||
|
|
if (err < 0) {
|
||
|
|
nlmsg_free(rep);
|
||
|
|
extra_len += 256;
|
||
|
|
if (extra_len >= PAGE_SIZE)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
goto again;
|
||
|
|
}
|
||
|
|
err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
|
||
|
|
|
||
|
|
out:
|
||
|
|
if (sk)
|
||
|
|
sock_put(sk);
|
||
|
|
out_nosk:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
|
||
|
|
{
|
||
|
|
int hdrlen = sizeof(struct unix_diag_req);
|
||
|
|
|
||
|
|
if (nlmsg_len(h) < hdrlen)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (h->nlmsg_flags & NLM_F_DUMP) {
|
||
|
|
struct netlink_dump_control c = {
|
||
|
|
.dump = unix_diag_dump,
|
||
|
|
};
|
||
|
|
return netlink_dump_start(sock_net(skb->sk)->diag_nlsk, skb, h, &c);
|
||
|
|
} else
|
||
|
|
return unix_diag_get_exact(skb, h, nlmsg_data(h));
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct sock_diag_handler unix_diag_handler = {
|
||
|
|
.family = AF_UNIX,
|
||
|
|
.dump = unix_diag_handler_dump,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init unix_diag_init(void)
|
||
|
|
{
|
||
|
|
return sock_diag_register(&unix_diag_handler);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit unix_diag_exit(void)
|
||
|
|
{
|
||
|
|
sock_diag_unregister(&unix_diag_handler);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(unix_diag_init);
|
||
|
|
module_exit(unix_diag_exit);
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);
|