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dc97391e66
Remove ->sendpage() and ->sendpage_locked(). sendmsg() with MSG_SPLICE_PAGES should be used instead. This allows multiple pages and multipage folios to be passed through. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> # for net/can cc: Jens Axboe <axboe@kernel.dk> cc: Matthew Wilcox <willy@infradead.org> cc: linux-afs@lists.infradead.org cc: mptcp@lists.linux.dev cc: rds-devel@oss.oracle.com cc: tipc-discussion@lists.sourceforge.net cc: virtualization@lists.linux-foundation.org Link: https://lore.kernel.org/r/20230623225513.2732256-16-dhowells@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
773 lines
16 KiB
C
773 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* File: socket.c
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*
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* Phonet sockets
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Authors: Sakari Ailus <sakari.ailus@nokia.com>
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* Rémi Denis-Courmont
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*/
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/net.h>
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#include <linux/poll.h>
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#include <linux/sched/signal.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <linux/phonet.h>
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#include <linux/export.h>
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#include <net/phonet/phonet.h>
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#include <net/phonet/pep.h>
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#include <net/phonet/pn_dev.h>
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static int pn_socket_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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if (sk) {
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sock->sk = NULL;
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sk->sk_prot->close(sk, 0);
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}
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return 0;
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}
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#define PN_HASHSIZE 16
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#define PN_HASHMASK (PN_HASHSIZE-1)
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static struct {
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struct hlist_head hlist[PN_HASHSIZE];
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struct mutex lock;
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} pnsocks;
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void __init pn_sock_init(void)
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{
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unsigned int i;
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for (i = 0; i < PN_HASHSIZE; i++)
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INIT_HLIST_HEAD(pnsocks.hlist + i);
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mutex_init(&pnsocks.lock);
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}
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static struct hlist_head *pn_hash_list(u16 obj)
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{
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return pnsocks.hlist + (obj & PN_HASHMASK);
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}
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/*
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* Find address based on socket address, match only certain fields.
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* Also grab sock if it was found. Remember to sock_put it later.
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*/
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struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
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{
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struct sock *sknode;
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struct sock *rval = NULL;
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u16 obj = pn_sockaddr_get_object(spn);
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u8 res = spn->spn_resource;
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struct hlist_head *hlist = pn_hash_list(obj);
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rcu_read_lock();
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sk_for_each_rcu(sknode, hlist) {
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struct pn_sock *pn = pn_sk(sknode);
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BUG_ON(!pn->sobject); /* unbound socket */
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if (!net_eq(sock_net(sknode), net))
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continue;
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if (pn_port(obj)) {
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/* Look up socket by port */
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if (pn_port(pn->sobject) != pn_port(obj))
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continue;
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} else {
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/* If port is zero, look up by resource */
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if (pn->resource != res)
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continue;
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}
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if (pn_addr(pn->sobject) &&
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pn_addr(pn->sobject) != pn_addr(obj))
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continue;
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rval = sknode;
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sock_hold(sknode);
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break;
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}
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rcu_read_unlock();
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return rval;
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}
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/* Deliver a broadcast packet (only in bottom-half) */
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void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
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{
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struct hlist_head *hlist = pnsocks.hlist;
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unsigned int h;
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rcu_read_lock();
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for (h = 0; h < PN_HASHSIZE; h++) {
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struct sock *sknode;
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sk_for_each(sknode, hlist) {
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struct sk_buff *clone;
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if (!net_eq(sock_net(sknode), net))
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continue;
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if (!sock_flag(sknode, SOCK_BROADCAST))
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continue;
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clone = skb_clone(skb, GFP_ATOMIC);
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if (clone) {
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sock_hold(sknode);
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sk_receive_skb(sknode, clone, 0);
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}
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}
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hlist++;
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}
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rcu_read_unlock();
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}
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int pn_sock_hash(struct sock *sk)
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{
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struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
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mutex_lock(&pnsocks.lock);
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sk_add_node_rcu(sk, hlist);
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mutex_unlock(&pnsocks.lock);
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return 0;
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}
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EXPORT_SYMBOL(pn_sock_hash);
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void pn_sock_unhash(struct sock *sk)
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{
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mutex_lock(&pnsocks.lock);
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sk_del_node_init_rcu(sk);
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mutex_unlock(&pnsocks.lock);
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pn_sock_unbind_all_res(sk);
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synchronize_rcu();
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}
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EXPORT_SYMBOL(pn_sock_unhash);
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static DEFINE_MUTEX(port_mutex);
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static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len)
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{
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struct sock *sk = sock->sk;
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struct pn_sock *pn = pn_sk(sk);
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struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
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int err;
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u16 handle;
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u8 saddr;
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if (sk->sk_prot->bind)
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return sk->sk_prot->bind(sk, addr, len);
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if (len < sizeof(struct sockaddr_pn))
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return -EINVAL;
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if (spn->spn_family != AF_PHONET)
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return -EAFNOSUPPORT;
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handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
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saddr = pn_addr(handle);
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if (saddr && phonet_address_lookup(sock_net(sk), saddr))
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return -EADDRNOTAVAIL;
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lock_sock(sk);
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if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
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err = -EINVAL; /* attempt to rebind */
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goto out;
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}
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WARN_ON(sk_hashed(sk));
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mutex_lock(&port_mutex);
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err = sk->sk_prot->get_port(sk, pn_port(handle));
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if (err)
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goto out_port;
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/* get_port() sets the port, bind() sets the address if applicable */
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pn->sobject = pn_object(saddr, pn_port(pn->sobject));
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pn->resource = spn->spn_resource;
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/* Enable RX on the socket */
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err = sk->sk_prot->hash(sk);
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out_port:
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mutex_unlock(&port_mutex);
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out:
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release_sock(sk);
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return err;
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}
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static int pn_socket_autobind(struct socket *sock)
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{
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struct sockaddr_pn sa;
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int err;
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memset(&sa, 0, sizeof(sa));
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sa.spn_family = AF_PHONET;
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err = pn_socket_bind(sock, (struct sockaddr *)&sa,
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sizeof(struct sockaddr_pn));
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if (err != -EINVAL)
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return err;
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BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
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return 0; /* socket was already bound */
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}
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static int pn_socket_connect(struct socket *sock, struct sockaddr *addr,
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int len, int flags)
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{
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struct sock *sk = sock->sk;
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struct pn_sock *pn = pn_sk(sk);
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struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
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struct task_struct *tsk = current;
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long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
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int err;
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if (pn_socket_autobind(sock))
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return -ENOBUFS;
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if (len < sizeof(struct sockaddr_pn))
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return -EINVAL;
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if (spn->spn_family != AF_PHONET)
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return -EAFNOSUPPORT;
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lock_sock(sk);
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switch (sock->state) {
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case SS_UNCONNECTED:
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if (sk->sk_state != TCP_CLOSE) {
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err = -EISCONN;
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goto out;
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}
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break;
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case SS_CONNECTING:
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err = -EALREADY;
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goto out;
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default:
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err = -EISCONN;
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goto out;
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}
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pn->dobject = pn_sockaddr_get_object(spn);
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pn->resource = pn_sockaddr_get_resource(spn);
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sock->state = SS_CONNECTING;
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err = sk->sk_prot->connect(sk, addr, len);
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if (err) {
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sock->state = SS_UNCONNECTED;
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pn->dobject = 0;
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goto out;
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}
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while (sk->sk_state == TCP_SYN_SENT) {
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DEFINE_WAIT(wait);
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if (!timeo) {
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err = -EINPROGRESS;
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goto out;
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}
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if (signal_pending(tsk)) {
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err = sock_intr_errno(timeo);
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goto out;
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}
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prepare_to_wait_exclusive(sk_sleep(sk), &wait,
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TASK_INTERRUPTIBLE);
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release_sock(sk);
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timeo = schedule_timeout(timeo);
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lock_sock(sk);
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finish_wait(sk_sleep(sk), &wait);
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}
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if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED))
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err = 0;
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else if (sk->sk_state == TCP_CLOSE_WAIT)
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err = -ECONNRESET;
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else
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err = -ECONNREFUSED;
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sock->state = err ? SS_UNCONNECTED : SS_CONNECTED;
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out:
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release_sock(sk);
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return err;
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}
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static int pn_socket_accept(struct socket *sock, struct socket *newsock,
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int flags, bool kern)
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{
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struct sock *sk = sock->sk;
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struct sock *newsk;
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int err;
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if (unlikely(sk->sk_state != TCP_LISTEN))
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return -EINVAL;
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newsk = sk->sk_prot->accept(sk, flags, &err, kern);
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if (!newsk)
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return err;
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lock_sock(newsk);
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sock_graft(newsk, newsock);
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newsock->state = SS_CONNECTED;
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release_sock(newsk);
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return 0;
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}
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static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
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int peer)
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{
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struct sock *sk = sock->sk;
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struct pn_sock *pn = pn_sk(sk);
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memset(addr, 0, sizeof(struct sockaddr_pn));
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addr->sa_family = AF_PHONET;
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if (!peer) /* Race with bind() here is userland's problem. */
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pn_sockaddr_set_object((struct sockaddr_pn *)addr,
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pn->sobject);
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return sizeof(struct sockaddr_pn);
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}
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static __poll_t pn_socket_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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struct sock *sk = sock->sk;
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struct pep_sock *pn = pep_sk(sk);
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__poll_t mask = 0;
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poll_wait(file, sk_sleep(sk), wait);
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if (sk->sk_state == TCP_CLOSE)
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return EPOLLERR;
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if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
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mask |= EPOLLIN | EPOLLRDNORM;
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if (!skb_queue_empty_lockless(&pn->ctrlreq_queue))
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mask |= EPOLLPRI;
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if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
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return EPOLLHUP;
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if (sk->sk_state == TCP_ESTABLISHED &&
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refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
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atomic_read(&pn->tx_credits))
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mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
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return mask;
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}
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static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
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unsigned long arg)
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{
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struct sock *sk = sock->sk;
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struct pn_sock *pn = pn_sk(sk);
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if (cmd == SIOCPNGETOBJECT) {
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struct net_device *dev;
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u16 handle;
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u8 saddr;
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if (get_user(handle, (__u16 __user *)arg))
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return -EFAULT;
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lock_sock(sk);
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if (sk->sk_bound_dev_if)
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dev = dev_get_by_index(sock_net(sk),
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sk->sk_bound_dev_if);
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else
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dev = phonet_device_get(sock_net(sk));
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if (dev && (dev->flags & IFF_UP))
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saddr = phonet_address_get(dev, pn_addr(handle));
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else
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saddr = PN_NO_ADDR;
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release_sock(sk);
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dev_put(dev);
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if (saddr == PN_NO_ADDR)
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return -EHOSTUNREACH;
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handle = pn_object(saddr, pn_port(pn->sobject));
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return put_user(handle, (__u16 __user *)arg);
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}
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return sk_ioctl(sk, cmd, (void __user *)arg);
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}
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static int pn_socket_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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int err = 0;
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if (pn_socket_autobind(sock))
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return -ENOBUFS;
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lock_sock(sk);
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if (sock->state != SS_UNCONNECTED) {
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err = -EINVAL;
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goto out;
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}
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if (sk->sk_state != TCP_LISTEN) {
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sk->sk_state = TCP_LISTEN;
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sk->sk_ack_backlog = 0;
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}
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sk->sk_max_ack_backlog = backlog;
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out:
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release_sock(sk);
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return err;
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}
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static int pn_socket_sendmsg(struct socket *sock, struct msghdr *m,
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size_t total_len)
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{
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struct sock *sk = sock->sk;
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if (pn_socket_autobind(sock))
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return -EAGAIN;
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return sk->sk_prot->sendmsg(sk, m, total_len);
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}
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const struct proto_ops phonet_dgram_ops = {
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.family = AF_PHONET,
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.owner = THIS_MODULE,
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.release = pn_socket_release,
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.bind = pn_socket_bind,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.accept = sock_no_accept,
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.getname = pn_socket_getname,
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.poll = datagram_poll,
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.ioctl = pn_socket_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.sendmsg = pn_socket_sendmsg,
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.recvmsg = sock_common_recvmsg,
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.mmap = sock_no_mmap,
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};
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const struct proto_ops phonet_stream_ops = {
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.family = AF_PHONET,
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.owner = THIS_MODULE,
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.release = pn_socket_release,
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.bind = pn_socket_bind,
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.connect = pn_socket_connect,
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.socketpair = sock_no_socketpair,
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.accept = pn_socket_accept,
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.getname = pn_socket_getname,
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.poll = pn_socket_poll,
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.ioctl = pn_socket_ioctl,
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.listen = pn_socket_listen,
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.shutdown = sock_no_shutdown,
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.setsockopt = sock_common_setsockopt,
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.getsockopt = sock_common_getsockopt,
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.sendmsg = pn_socket_sendmsg,
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.recvmsg = sock_common_recvmsg,
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.mmap = sock_no_mmap,
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};
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EXPORT_SYMBOL(phonet_stream_ops);
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/* allocate port for a socket */
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int pn_sock_get_port(struct sock *sk, unsigned short sport)
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{
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static int port_cur;
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struct net *net = sock_net(sk);
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struct pn_sock *pn = pn_sk(sk);
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struct sockaddr_pn try_sa;
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struct sock *tmpsk;
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memset(&try_sa, 0, sizeof(struct sockaddr_pn));
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try_sa.spn_family = AF_PHONET;
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WARN_ON(!mutex_is_locked(&port_mutex));
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if (!sport) {
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/* search free port */
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int port, pmin, pmax;
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phonet_get_local_port_range(&pmin, &pmax);
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for (port = pmin; port <= pmax; port++) {
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port_cur++;
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if (port_cur < pmin || port_cur > pmax)
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port_cur = pmin;
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pn_sockaddr_set_port(&try_sa, port_cur);
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tmpsk = pn_find_sock_by_sa(net, &try_sa);
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if (tmpsk == NULL) {
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sport = port_cur;
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goto found;
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} else
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sock_put(tmpsk);
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}
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} else {
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/* try to find specific port */
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pn_sockaddr_set_port(&try_sa, sport);
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tmpsk = pn_find_sock_by_sa(net, &try_sa);
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if (tmpsk == NULL)
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/* No sock there! We can use that port... */
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goto found;
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else
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sock_put(tmpsk);
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}
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/* the port must be in use already */
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return -EADDRINUSE;
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found:
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pn->sobject = pn_object(pn_addr(pn->sobject), sport);
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return 0;
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}
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EXPORT_SYMBOL(pn_sock_get_port);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
struct hlist_head *hlist = pnsocks.hlist;
|
|
struct sock *sknode;
|
|
unsigned int h;
|
|
|
|
for (h = 0; h < PN_HASHSIZE; h++) {
|
|
sk_for_each_rcu(sknode, hlist) {
|
|
if (!net_eq(net, sock_net(sknode)))
|
|
continue;
|
|
if (!pos)
|
|
return sknode;
|
|
pos--;
|
|
}
|
|
hlist++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
|
|
do
|
|
sk = sk_next(sk);
|
|
while (sk && !net_eq(net, sock_net(sk)));
|
|
|
|
return sk;
|
|
}
|
|
|
|
static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(rcu)
|
|
{
|
|
rcu_read_lock();
|
|
return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct sock *sk;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
sk = pn_sock_get_idx(seq, 0);
|
|
else
|
|
sk = pn_sock_get_next(seq, v);
|
|
(*pos)++;
|
|
return sk;
|
|
}
|
|
|
|
static void pn_sock_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(rcu)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int pn_sock_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
seq_setwidth(seq, 127);
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, "pt loc rem rs st tx_queue rx_queue "
|
|
" uid inode ref pointer drops");
|
|
else {
|
|
struct sock *sk = v;
|
|
struct pn_sock *pn = pn_sk(sk);
|
|
|
|
seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
|
|
"%d %pK %u",
|
|
sk->sk_protocol, pn->sobject, pn->dobject,
|
|
pn->resource, sk->sk_state,
|
|
sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
|
|
from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
|
|
sock_i_ino(sk),
|
|
refcount_read(&sk->sk_refcnt), sk,
|
|
atomic_read(&sk->sk_drops));
|
|
}
|
|
seq_pad(seq, '\n');
|
|
return 0;
|
|
}
|
|
|
|
const struct seq_operations pn_sock_seq_ops = {
|
|
.start = pn_sock_seq_start,
|
|
.next = pn_sock_seq_next,
|
|
.stop = pn_sock_seq_stop,
|
|
.show = pn_sock_seq_show,
|
|
};
|
|
#endif
|
|
|
|
static struct {
|
|
struct sock *sk[256];
|
|
} pnres;
|
|
|
|
/*
|
|
* Find and hold socket based on resource.
|
|
*/
|
|
struct sock *pn_find_sock_by_res(struct net *net, u8 res)
|
|
{
|
|
struct sock *sk;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return NULL;
|
|
|
|
rcu_read_lock();
|
|
sk = rcu_dereference(pnres.sk[res]);
|
|
if (sk)
|
|
sock_hold(sk);
|
|
rcu_read_unlock();
|
|
return sk;
|
|
}
|
|
|
|
static DEFINE_MUTEX(resource_mutex);
|
|
|
|
int pn_sock_bind_res(struct sock *sk, u8 res)
|
|
{
|
|
int ret = -EADDRINUSE;
|
|
|
|
if (!net_eq(sock_net(sk), &init_net))
|
|
return -ENOIOCTLCMD;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
if (pn_socket_autobind(sk->sk_socket))
|
|
return -EAGAIN;
|
|
|
|
mutex_lock(&resource_mutex);
|
|
if (pnres.sk[res] == NULL) {
|
|
sock_hold(sk);
|
|
rcu_assign_pointer(pnres.sk[res], sk);
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&resource_mutex);
|
|
return ret;
|
|
}
|
|
|
|
int pn_sock_unbind_res(struct sock *sk, u8 res)
|
|
{
|
|
int ret = -ENOENT;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
mutex_lock(&resource_mutex);
|
|
if (pnres.sk[res] == sk) {
|
|
RCU_INIT_POINTER(pnres.sk[res], NULL);
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&resource_mutex);
|
|
|
|
if (ret == 0) {
|
|
synchronize_rcu();
|
|
sock_put(sk);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void pn_sock_unbind_all_res(struct sock *sk)
|
|
{
|
|
unsigned int res, match = 0;
|
|
|
|
mutex_lock(&resource_mutex);
|
|
for (res = 0; res < 256; res++) {
|
|
if (pnres.sk[res] == sk) {
|
|
RCU_INIT_POINTER(pnres.sk[res], NULL);
|
|
match++;
|
|
}
|
|
}
|
|
mutex_unlock(&resource_mutex);
|
|
|
|
while (match > 0) {
|
|
__sock_put(sk);
|
|
match--;
|
|
}
|
|
/* Caller is responsible for RCU sync before final sock_put() */
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
unsigned int i;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return NULL;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
if (pnres.sk[i] == NULL)
|
|
continue;
|
|
if (!pos)
|
|
return pnres.sk + i;
|
|
pos--;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
unsigned int i;
|
|
|
|
BUG_ON(!net_eq(net, &init_net));
|
|
|
|
for (i = (sk - pnres.sk) + 1; i < 256; i++)
|
|
if (pnres.sk[i])
|
|
return pnres.sk + i;
|
|
return NULL;
|
|
}
|
|
|
|
static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(resource_mutex)
|
|
{
|
|
mutex_lock(&resource_mutex);
|
|
return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct sock **sk;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
sk = pn_res_get_idx(seq, 0);
|
|
else
|
|
sk = pn_res_get_next(seq, v);
|
|
(*pos)++;
|
|
return sk;
|
|
}
|
|
|
|
static void pn_res_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(resource_mutex)
|
|
{
|
|
mutex_unlock(&resource_mutex);
|
|
}
|
|
|
|
static int pn_res_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
seq_setwidth(seq, 63);
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, "rs uid inode");
|
|
else {
|
|
struct sock **psk = v;
|
|
struct sock *sk = *psk;
|
|
|
|
seq_printf(seq, "%02X %5u %lu",
|
|
(int) (psk - pnres.sk),
|
|
from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
|
|
sock_i_ino(sk));
|
|
}
|
|
seq_pad(seq, '\n');
|
|
return 0;
|
|
}
|
|
|
|
const struct seq_operations pn_res_seq_ops = {
|
|
.start = pn_res_seq_start,
|
|
.next = pn_res_seq_next,
|
|
.stop = pn_res_seq_stop,
|
|
.show = pn_res_seq_show,
|
|
};
|
|
#endif
|