![Eric Dumazet](/assets/img/avatar_default.png)
sk->sk_backlog.tail might be read without holding the socket spinlock, we need to add proper READ_ONCE()/WRITE_ONCE() to silence the warnings. KCSAN reported : BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg write to 0xffff8881265109f8 of 8 bytes by interrupt on cpu 1: __sk_add_backlog include/net/sock.h:907 [inline] sk_add_backlog include/net/sock.h:938 [inline] tcp_add_backlog+0x476/0xce0 net/ipv4/tcp_ipv4.c:1759 tcp_v4_rcv+0x1a70/0x1bd0 net/ipv4/tcp_ipv4.c:1947 ip_protocol_deliver_rcu+0x4d/0x420 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0x121/0x160 net/ipv4/ip_input.c:413 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_rcv+0x18f/0x1a0 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:4929 __netif_receive_skb+0x37/0xf0 net/core/dev.c:5043 netif_receive_skb_internal+0x59/0x190 net/core/dev.c:5133 napi_skb_finish net/core/dev.c:5596 [inline] napi_gro_receive+0x28f/0x330 net/core/dev.c:5629 receive_buf+0x284/0x30b0 drivers/net/virtio_net.c:1061 virtnet_receive drivers/net/virtio_net.c:1323 [inline] virtnet_poll+0x436/0x7d0 drivers/net/virtio_net.c:1428 napi_poll net/core/dev.c:6311 [inline] net_rx_action+0x3ae/0xa90 net/core/dev.c:6379 __do_softirq+0x115/0x33f kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xbb/0xe0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] do_IRQ+0xa6/0x180 arch/x86/kernel/irq.c:263 ret_from_intr+0x0/0x19 native_safe_halt+0xe/0x10 arch/x86/kernel/paravirt.c:71 arch_cpu_idle+0x1f/0x30 arch/x86/kernel/process.c:571 default_idle_call+0x1e/0x40 kernel/sched/idle.c:94 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1af/0x280 kernel/sched/idle.c:263 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:355 start_secondary+0x208/0x260 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 read to 0xffff8881265109f8 of 8 bytes by task 8057 on cpu 0: tcp_recvmsg+0x46e/0x1b40 net/ipv4/tcp.c:2050 inet_recvmsg+0xbb/0x250 net/ipv4/af_inet.c:838 sock_recvmsg_nosec net/socket.c:871 [inline] sock_recvmsg net/socket.c:889 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:885 sock_read_iter+0x15f/0x1e0 net/socket.c:967 call_read_iter include/linux/fs.h:1889 [inline] new_sync_read+0x389/0x4f0 fs/read_write.c:414 __vfs_read+0xb1/0xc0 fs/read_write.c:427 vfs_read fs/read_write.c:461 [inline] vfs_read+0x143/0x2c0 fs/read_write.c:446 ksys_read+0xd5/0x1b0 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x4c/0x60 fs/read_write.c:595 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8057 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1273 lines
31 KiB
C
1273 lines
31 KiB
C
/*
|
|
* af_llc.c - LLC User Interface SAPs
|
|
* Description:
|
|
* Functions in this module are implementation of socket based llc
|
|
* communications for the Linux operating system. Support of llc class
|
|
* one and class two is provided via SOCK_DGRAM and SOCK_STREAM
|
|
* respectively.
|
|
*
|
|
* An llc2 connection is (mac + sap), only one llc2 sap connection
|
|
* is allowed per mac. Though one sap may have multiple mac + sap
|
|
* connections.
|
|
*
|
|
* Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
|
|
* 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
|
|
*
|
|
* This program can be redistributed or modified under the terms of the
|
|
* GNU General Public License as published by the Free Software Foundation.
|
|
* This program is distributed without any warranty or implied warranty
|
|
* of merchantability or fitness for a particular purpose.
|
|
*
|
|
* See the GNU General Public License for more details.
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched/signal.h>
|
|
|
|
#include <net/llc.h>
|
|
#include <net/llc_sap.h>
|
|
#include <net/llc_pdu.h>
|
|
#include <net/llc_conn.h>
|
|
#include <net/tcp_states.h>
|
|
|
|
/* remember: uninitialized global data is zeroed because its in .bss */
|
|
static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
|
|
static u16 llc_ui_sap_link_no_max[256];
|
|
static struct sockaddr_llc llc_ui_addrnull;
|
|
static const struct proto_ops llc_ui_ops;
|
|
|
|
static bool llc_ui_wait_for_conn(struct sock *sk, long timeout);
|
|
static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
|
|
static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
|
|
|
|
#if 0
|
|
#define dprintk(args...) printk(KERN_DEBUG args)
|
|
#else
|
|
#define dprintk(args...)
|
|
#endif
|
|
|
|
/* Maybe we'll add some more in the future. */
|
|
#define LLC_CMSG_PKTINFO 1
|
|
|
|
|
|
/**
|
|
* llc_ui_next_link_no - return the next unused link number for a sap
|
|
* @sap: Address of sap to get link number from.
|
|
*
|
|
* Return the next unused link number for a given sap.
|
|
*/
|
|
static inline u16 llc_ui_next_link_no(int sap)
|
|
{
|
|
return llc_ui_sap_link_no_max[sap]++;
|
|
}
|
|
|
|
/**
|
|
* llc_proto_type - return eth protocol for ARP header type
|
|
* @arphrd: ARP header type.
|
|
*
|
|
* Given an ARP header type return the corresponding ethernet protocol.
|
|
*/
|
|
static inline __be16 llc_proto_type(u16 arphrd)
|
|
{
|
|
return htons(ETH_P_802_2);
|
|
}
|
|
|
|
/**
|
|
* llc_ui_addr_null - determines if a address structure is null
|
|
* @addr: Address to test if null.
|
|
*/
|
|
static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
|
|
{
|
|
return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
|
|
}
|
|
|
|
/**
|
|
* llc_ui_header_len - return length of llc header based on operation
|
|
* @sk: Socket which contains a valid llc socket type.
|
|
* @addr: Complete sockaddr_llc structure received from the user.
|
|
*
|
|
* Provide the length of the llc header depending on what kind of
|
|
* operation the user would like to perform and the type of socket.
|
|
* Returns the correct llc header length.
|
|
*/
|
|
static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
|
|
{
|
|
u8 rc = LLC_PDU_LEN_U;
|
|
|
|
if (addr->sllc_test || addr->sllc_xid)
|
|
rc = LLC_PDU_LEN_U;
|
|
else if (sk->sk_type == SOCK_STREAM)
|
|
rc = LLC_PDU_LEN_I;
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_send_data - send data via reliable llc2 connection
|
|
* @sk: Connection the socket is using.
|
|
* @skb: Data the user wishes to send.
|
|
* @noblock: can we block waiting for data?
|
|
*
|
|
* Send data via reliable llc2 connection.
|
|
* Returns 0 upon success, non-zero if action did not succeed.
|
|
*
|
|
* This function always consumes a reference to the skb.
|
|
*/
|
|
static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
|
|
{
|
|
struct llc_sock* llc = llc_sk(sk);
|
|
|
|
if (unlikely(llc_data_accept_state(llc->state) ||
|
|
llc->remote_busy_flag ||
|
|
llc->p_flag)) {
|
|
long timeout = sock_sndtimeo(sk, noblock);
|
|
int rc;
|
|
|
|
rc = llc_ui_wait_for_busy_core(sk, timeout);
|
|
if (rc) {
|
|
kfree_skb(skb);
|
|
return rc;
|
|
}
|
|
}
|
|
return llc_build_and_send_pkt(sk, skb);
|
|
}
|
|
|
|
static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
|
|
{
|
|
sock_graft(sk, sock);
|
|
sk->sk_type = sock->type;
|
|
sock->ops = &llc_ui_ops;
|
|
}
|
|
|
|
static struct proto llc_proto = {
|
|
.name = "LLC",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct llc_sock),
|
|
.slab_flags = SLAB_TYPESAFE_BY_RCU,
|
|
};
|
|
|
|
/**
|
|
* llc_ui_create - alloc and init a new llc_ui socket
|
|
* @net: network namespace (must be default network)
|
|
* @sock: Socket to initialize and attach allocated sk to.
|
|
* @protocol: Unused.
|
|
* @kern: on behalf of kernel or userspace
|
|
*
|
|
* Allocate and initialize a new llc_ui socket, validate the user wants a
|
|
* socket type we have available.
|
|
* Returns 0 upon success, negative upon failure.
|
|
*/
|
|
static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
int rc = -ESOCKTNOSUPPORT;
|
|
|
|
if (!ns_capable(net->user_ns, CAP_NET_RAW))
|
|
return -EPERM;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EAFNOSUPPORT;
|
|
|
|
if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
|
|
rc = -ENOMEM;
|
|
sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
|
|
if (sk) {
|
|
rc = 0;
|
|
llc_ui_sk_init(sock, sk);
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_release - shutdown socket
|
|
* @sock: Socket to release.
|
|
*
|
|
* Shutdown and deallocate an existing socket.
|
|
*/
|
|
static int llc_ui_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc;
|
|
|
|
if (unlikely(sk == NULL))
|
|
goto out;
|
|
sock_hold(sk);
|
|
lock_sock(sk);
|
|
llc = llc_sk(sk);
|
|
dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
|
|
llc->laddr.lsap, llc->daddr.lsap);
|
|
if (!llc_send_disc(sk))
|
|
llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
|
|
if (!sock_flag(sk, SOCK_ZAPPED)) {
|
|
struct llc_sap *sap = llc->sap;
|
|
|
|
/* Hold this for release_sock(), so that llc_backlog_rcv()
|
|
* could still use it.
|
|
*/
|
|
llc_sap_hold(sap);
|
|
llc_sap_remove_socket(llc->sap, sk);
|
|
release_sock(sk);
|
|
llc_sap_put(sap);
|
|
} else {
|
|
release_sock(sk);
|
|
}
|
|
if (llc->dev)
|
|
dev_put(llc->dev);
|
|
sock_put(sk);
|
|
llc_sk_free(sk);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_autoport - provide dynamically allocate SAP number
|
|
*
|
|
* Provide the caller with a dynamically allocated SAP number according
|
|
* to the rules that are set in this function. Returns: 0, upon failure,
|
|
* SAP number otherwise.
|
|
*/
|
|
static int llc_ui_autoport(void)
|
|
{
|
|
struct llc_sap *sap;
|
|
int i, tries = 0;
|
|
|
|
while (tries < LLC_SAP_DYN_TRIES) {
|
|
for (i = llc_ui_sap_last_autoport;
|
|
i < LLC_SAP_DYN_STOP; i += 2) {
|
|
sap = llc_sap_find(i);
|
|
if (!sap) {
|
|
llc_ui_sap_last_autoport = i + 2;
|
|
goto out;
|
|
}
|
|
llc_sap_put(sap);
|
|
}
|
|
llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
|
|
tries++;
|
|
}
|
|
i = 0;
|
|
out:
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_autobind - automatically bind a socket to a sap
|
|
* @sock: socket to bind
|
|
* @addr: address to connect to
|
|
*
|
|
* Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
|
|
* specifically used llc_ui_bind to bind to an specific address/sap
|
|
*
|
|
* Returns: 0 upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
struct llc_sap *sap;
|
|
int rc = -EINVAL;
|
|
|
|
if (!sock_flag(sk, SOCK_ZAPPED))
|
|
goto out;
|
|
rc = -ENODEV;
|
|
if (sk->sk_bound_dev_if) {
|
|
llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
|
|
if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
|
|
dev_put(llc->dev);
|
|
llc->dev = NULL;
|
|
}
|
|
} else
|
|
llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
|
|
if (!llc->dev)
|
|
goto out;
|
|
rc = -EUSERS;
|
|
llc->laddr.lsap = llc_ui_autoport();
|
|
if (!llc->laddr.lsap)
|
|
goto out;
|
|
rc = -EBUSY; /* some other network layer is using the sap */
|
|
sap = llc_sap_open(llc->laddr.lsap, NULL);
|
|
if (!sap)
|
|
goto out;
|
|
memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
|
|
memcpy(&llc->addr, addr, sizeof(llc->addr));
|
|
/* assign new connection to its SAP */
|
|
llc_sap_add_socket(sap, sk);
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_bind - bind a socket to a specific address.
|
|
* @sock: Socket to bind an address to.
|
|
* @uaddr: Address the user wants the socket bound to.
|
|
* @addrlen: Length of the uaddr structure.
|
|
*
|
|
* Bind a socket to a specific address. For llc a user is able to bind to
|
|
* a specific sap only or mac + sap.
|
|
* If the user desires to bind to a specific mac + sap, it is possible to
|
|
* have multiple sap connections via multiple macs.
|
|
* Bind and autobind for that matter must enforce the correct sap usage
|
|
* otherwise all hell will break loose.
|
|
* Returns: 0 upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
|
|
{
|
|
struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
struct llc_sap *sap;
|
|
int rc = -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
|
|
goto out;
|
|
rc = -EAFNOSUPPORT;
|
|
if (unlikely(addr->sllc_family != AF_LLC))
|
|
goto out;
|
|
dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
|
|
rc = -ENODEV;
|
|
rcu_read_lock();
|
|
if (sk->sk_bound_dev_if) {
|
|
llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
|
|
if (llc->dev) {
|
|
if (!addr->sllc_arphrd)
|
|
addr->sllc_arphrd = llc->dev->type;
|
|
if (is_zero_ether_addr(addr->sllc_mac))
|
|
memcpy(addr->sllc_mac, llc->dev->dev_addr,
|
|
IFHWADDRLEN);
|
|
if (addr->sllc_arphrd != llc->dev->type ||
|
|
!ether_addr_equal(addr->sllc_mac,
|
|
llc->dev->dev_addr)) {
|
|
rc = -EINVAL;
|
|
llc->dev = NULL;
|
|
}
|
|
}
|
|
} else
|
|
llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
|
|
addr->sllc_mac);
|
|
if (llc->dev)
|
|
dev_hold(llc->dev);
|
|
rcu_read_unlock();
|
|
if (!llc->dev)
|
|
goto out;
|
|
if (!addr->sllc_sap) {
|
|
rc = -EUSERS;
|
|
addr->sllc_sap = llc_ui_autoport();
|
|
if (!addr->sllc_sap)
|
|
goto out;
|
|
}
|
|
sap = llc_sap_find(addr->sllc_sap);
|
|
if (!sap) {
|
|
sap = llc_sap_open(addr->sllc_sap, NULL);
|
|
rc = -EBUSY; /* some other network layer is using the sap */
|
|
if (!sap)
|
|
goto out;
|
|
} else {
|
|
struct llc_addr laddr, daddr;
|
|
struct sock *ask;
|
|
|
|
memset(&laddr, 0, sizeof(laddr));
|
|
memset(&daddr, 0, sizeof(daddr));
|
|
/*
|
|
* FIXME: check if the address is multicast,
|
|
* only SOCK_DGRAM can do this.
|
|
*/
|
|
memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
|
|
laddr.lsap = addr->sllc_sap;
|
|
rc = -EADDRINUSE; /* mac + sap clash. */
|
|
ask = llc_lookup_established(sap, &daddr, &laddr);
|
|
if (ask) {
|
|
sock_put(ask);
|
|
goto out_put;
|
|
}
|
|
}
|
|
llc->laddr.lsap = addr->sllc_sap;
|
|
memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
|
|
memcpy(&llc->addr, addr, sizeof(llc->addr));
|
|
/* assign new connection to its SAP */
|
|
llc_sap_add_socket(sap, sk);
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
rc = 0;
|
|
out_put:
|
|
llc_sap_put(sap);
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_shutdown - shutdown a connect llc2 socket.
|
|
* @sock: Socket to shutdown.
|
|
* @how: What part of the socket to shutdown.
|
|
*
|
|
* Shutdown a connected llc2 socket. Currently this function only supports
|
|
* shutting down both sends and receives (2), we could probably make this
|
|
* function such that a user can shutdown only half the connection but not
|
|
* right now.
|
|
* Returns: 0 upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int rc = -ENOTCONN;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(sk->sk_state != TCP_ESTABLISHED))
|
|
goto out;
|
|
rc = -EINVAL;
|
|
if (how != 2)
|
|
goto out;
|
|
rc = llc_send_disc(sk);
|
|
if (!rc)
|
|
rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
|
|
/* Wake up anyone sleeping in poll */
|
|
sk->sk_state_change(sk);
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_connect - Connect to a remote llc2 mac + sap.
|
|
* @sock: Socket which will be connected to the remote destination.
|
|
* @uaddr: Remote and possibly the local address of the new connection.
|
|
* @addrlen: Size of uaddr structure.
|
|
* @flags: Operational flags specified by the user.
|
|
*
|
|
* Connect to a remote llc2 mac + sap. The caller must specify the
|
|
* destination mac and address to connect to. If the user hasn't previously
|
|
* called bind(2) with a smac the address of the first interface of the
|
|
* specified arp type will be used.
|
|
* This function will autobind if user did not previously call bind.
|
|
* Returns: 0 upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
|
|
int addrlen, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
|
|
int rc = -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(addrlen != sizeof(*addr)))
|
|
goto out;
|
|
rc = -EAFNOSUPPORT;
|
|
if (unlikely(addr->sllc_family != AF_LLC))
|
|
goto out;
|
|
if (unlikely(sk->sk_type != SOCK_STREAM))
|
|
goto out;
|
|
rc = -EALREADY;
|
|
if (unlikely(sock->state == SS_CONNECTING))
|
|
goto out;
|
|
/* bind connection to sap if user hasn't done it. */
|
|
if (sock_flag(sk, SOCK_ZAPPED)) {
|
|
/* bind to sap with null dev, exclusive */
|
|
rc = llc_ui_autobind(sock, addr);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
llc->daddr.lsap = addr->sllc_sap;
|
|
memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
|
|
sock->state = SS_CONNECTING;
|
|
sk->sk_state = TCP_SYN_SENT;
|
|
llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
|
|
rc = llc_establish_connection(sk, llc->dev->dev_addr,
|
|
addr->sllc_mac, addr->sllc_sap);
|
|
if (rc) {
|
|
dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
|
|
sock->state = SS_UNCONNECTED;
|
|
sk->sk_state = TCP_CLOSE;
|
|
goto out;
|
|
}
|
|
|
|
if (sk->sk_state == TCP_SYN_SENT) {
|
|
const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
|
|
|
|
if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
|
|
goto out;
|
|
|
|
rc = sock_intr_errno(timeo);
|
|
if (signal_pending(current))
|
|
goto out;
|
|
}
|
|
|
|
if (sk->sk_state == TCP_CLOSE)
|
|
goto sock_error;
|
|
|
|
sock->state = SS_CONNECTED;
|
|
rc = 0;
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
sock_error:
|
|
rc = sock_error(sk) ? : -ECONNABORTED;
|
|
sock->state = SS_UNCONNECTED;
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_listen - allow a normal socket to accept incoming connections
|
|
* @sock: Socket to allow incoming connections on.
|
|
* @backlog: Number of connections to queue.
|
|
*
|
|
* Allow a normal socket to accept incoming connections.
|
|
* Returns 0 upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int rc = -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(sock->state != SS_UNCONNECTED))
|
|
goto out;
|
|
rc = -EOPNOTSUPP;
|
|
if (unlikely(sk->sk_type != SOCK_STREAM))
|
|
goto out;
|
|
rc = -EAGAIN;
|
|
if (sock_flag(sk, SOCK_ZAPPED))
|
|
goto out;
|
|
rc = 0;
|
|
if (!(unsigned int)backlog) /* BSDism */
|
|
backlog = 1;
|
|
sk->sk_max_ack_backlog = backlog;
|
|
if (sk->sk_state != TCP_LISTEN) {
|
|
sk->sk_ack_backlog = 0;
|
|
sk->sk_state = TCP_LISTEN;
|
|
}
|
|
sk->sk_socket->flags |= __SO_ACCEPTCON;
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
|
|
{
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
int rc = 0;
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
while (1) {
|
|
if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
|
|
break;
|
|
rc = -ERESTARTSYS;
|
|
if (signal_pending(current))
|
|
break;
|
|
rc = -EAGAIN;
|
|
if (!timeout)
|
|
break;
|
|
rc = 0;
|
|
}
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
return rc;
|
|
}
|
|
|
|
static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
|
|
{
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
while (1) {
|
|
if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
|
|
break;
|
|
if (signal_pending(current) || !timeout)
|
|
break;
|
|
}
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
return timeout;
|
|
}
|
|
|
|
static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
|
|
{
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
int rc;
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
while (1) {
|
|
rc = 0;
|
|
if (sk_wait_event(sk, &timeout,
|
|
(sk->sk_shutdown & RCV_SHUTDOWN) ||
|
|
(!llc_data_accept_state(llc->state) &&
|
|
!llc->remote_busy_flag &&
|
|
!llc->p_flag), &wait))
|
|
break;
|
|
rc = -ERESTARTSYS;
|
|
if (signal_pending(current))
|
|
break;
|
|
rc = -EAGAIN;
|
|
if (!timeout)
|
|
break;
|
|
}
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
return rc;
|
|
}
|
|
|
|
static int llc_wait_data(struct sock *sk, long timeo)
|
|
{
|
|
int rc;
|
|
|
|
while (1) {
|
|
/*
|
|
* POSIX 1003.1g mandates this order.
|
|
*/
|
|
rc = sock_error(sk);
|
|
if (rc)
|
|
break;
|
|
rc = 0;
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
break;
|
|
rc = -EAGAIN;
|
|
if (!timeo)
|
|
break;
|
|
rc = sock_intr_errno(timeo);
|
|
if (signal_pending(current))
|
|
break;
|
|
rc = 0;
|
|
if (sk_wait_data(sk, &timeo, NULL))
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
|
|
{
|
|
struct llc_sock *llc = llc_sk(skb->sk);
|
|
|
|
if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
|
|
struct llc_pktinfo info;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
|
|
llc_pdu_decode_dsap(skb, &info.lpi_sap);
|
|
llc_pdu_decode_da(skb, info.lpi_mac);
|
|
put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* llc_ui_accept - accept a new incoming connection.
|
|
* @sock: Socket which connections arrive on.
|
|
* @newsock: Socket to move incoming connection to.
|
|
* @flags: User specified operational flags.
|
|
* @kern: If the socket is kernel internal
|
|
*
|
|
* Accept a new incoming connection.
|
|
* Returns 0 upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
|
|
bool kern)
|
|
{
|
|
struct sock *sk = sock->sk, *newsk;
|
|
struct llc_sock *llc, *newllc;
|
|
struct sk_buff *skb;
|
|
int rc = -EOPNOTSUPP;
|
|
|
|
dprintk("%s: accepting on %02X\n", __func__,
|
|
llc_sk(sk)->laddr.lsap);
|
|
lock_sock(sk);
|
|
if (unlikely(sk->sk_type != SOCK_STREAM))
|
|
goto out;
|
|
rc = -EINVAL;
|
|
if (unlikely(sock->state != SS_UNCONNECTED ||
|
|
sk->sk_state != TCP_LISTEN))
|
|
goto out;
|
|
/* wait for a connection to arrive. */
|
|
if (skb_queue_empty(&sk->sk_receive_queue)) {
|
|
rc = llc_wait_data(sk, sk->sk_rcvtimeo);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
dprintk("%s: got a new connection on %02X\n", __func__,
|
|
llc_sk(sk)->laddr.lsap);
|
|
skb = skb_dequeue(&sk->sk_receive_queue);
|
|
rc = -EINVAL;
|
|
if (!skb->sk)
|
|
goto frees;
|
|
rc = 0;
|
|
newsk = skb->sk;
|
|
/* attach connection to a new socket. */
|
|
llc_ui_sk_init(newsock, newsk);
|
|
sock_reset_flag(newsk, SOCK_ZAPPED);
|
|
newsk->sk_state = TCP_ESTABLISHED;
|
|
newsock->state = SS_CONNECTED;
|
|
llc = llc_sk(sk);
|
|
newllc = llc_sk(newsk);
|
|
memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
|
|
newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
|
|
|
|
/* put original socket back into a clean listen state. */
|
|
sk->sk_state = TCP_LISTEN;
|
|
sk_acceptq_removed(sk);
|
|
dprintk("%s: ok success on %02X, client on %02X\n", __func__,
|
|
llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
|
|
frees:
|
|
kfree_skb(skb);
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_recvmsg - copy received data to the socket user.
|
|
* @sock: Socket to copy data from.
|
|
* @msg: Various user space related information.
|
|
* @len: Size of user buffer.
|
|
* @flags: User specified flags.
|
|
*
|
|
* Copy received data to the socket user.
|
|
* Returns non-negative upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
|
|
int flags)
|
|
{
|
|
DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
|
|
const int nonblock = flags & MSG_DONTWAIT;
|
|
struct sk_buff *skb = NULL;
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
size_t copied = 0;
|
|
u32 peek_seq = 0;
|
|
u32 *seq, skb_len;
|
|
unsigned long used;
|
|
int target; /* Read at least this many bytes */
|
|
long timeo;
|
|
|
|
lock_sock(sk);
|
|
copied = -ENOTCONN;
|
|
if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
|
|
goto out;
|
|
|
|
timeo = sock_rcvtimeo(sk, nonblock);
|
|
|
|
seq = &llc->copied_seq;
|
|
if (flags & MSG_PEEK) {
|
|
peek_seq = llc->copied_seq;
|
|
seq = &peek_seq;
|
|
}
|
|
|
|
target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
|
|
copied = 0;
|
|
|
|
do {
|
|
u32 offset;
|
|
|
|
/*
|
|
* We need to check signals first, to get correct SIGURG
|
|
* handling. FIXME: Need to check this doesn't impact 1003.1g
|
|
* and move it down to the bottom of the loop
|
|
*/
|
|
if (signal_pending(current)) {
|
|
if (copied)
|
|
break;
|
|
copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
/* Next get a buffer. */
|
|
|
|
skb = skb_peek(&sk->sk_receive_queue);
|
|
if (skb) {
|
|
offset = *seq;
|
|
goto found_ok_skb;
|
|
}
|
|
/* Well, if we have backlog, try to process it now yet. */
|
|
|
|
if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
|
|
break;
|
|
|
|
if (copied) {
|
|
if (sk->sk_err ||
|
|
sk->sk_state == TCP_CLOSE ||
|
|
(sk->sk_shutdown & RCV_SHUTDOWN) ||
|
|
!timeo ||
|
|
(flags & MSG_PEEK))
|
|
break;
|
|
} else {
|
|
if (sock_flag(sk, SOCK_DONE))
|
|
break;
|
|
|
|
if (sk->sk_err) {
|
|
copied = sock_error(sk);
|
|
break;
|
|
}
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
break;
|
|
|
|
if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
|
|
if (!sock_flag(sk, SOCK_DONE)) {
|
|
/*
|
|
* This occurs when user tries to read
|
|
* from never connected socket.
|
|
*/
|
|
copied = -ENOTCONN;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
if (!timeo) {
|
|
copied = -EAGAIN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (copied >= target) { /* Do not sleep, just process backlog. */
|
|
release_sock(sk);
|
|
lock_sock(sk);
|
|
} else
|
|
sk_wait_data(sk, &timeo, NULL);
|
|
|
|
if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
|
|
net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
|
|
current->comm,
|
|
task_pid_nr(current));
|
|
peek_seq = llc->copied_seq;
|
|
}
|
|
continue;
|
|
found_ok_skb:
|
|
skb_len = skb->len;
|
|
/* Ok so how much can we use? */
|
|
used = skb->len - offset;
|
|
if (len < used)
|
|
used = len;
|
|
|
|
if (!(flags & MSG_TRUNC)) {
|
|
int rc = skb_copy_datagram_msg(skb, offset, msg, used);
|
|
if (rc) {
|
|
/* Exception. Bailout! */
|
|
if (!copied)
|
|
copied = -EFAULT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
*seq += used;
|
|
copied += used;
|
|
len -= used;
|
|
|
|
/* For non stream protcols we get one packet per recvmsg call */
|
|
if (sk->sk_type != SOCK_STREAM)
|
|
goto copy_uaddr;
|
|
|
|
if (!(flags & MSG_PEEK)) {
|
|
skb_unlink(skb, &sk->sk_receive_queue);
|
|
kfree_skb(skb);
|
|
*seq = 0;
|
|
}
|
|
|
|
/* Partial read */
|
|
if (used + offset < skb_len)
|
|
continue;
|
|
} while (len > 0);
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return copied;
|
|
copy_uaddr:
|
|
if (uaddr != NULL && skb != NULL) {
|
|
memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
|
|
msg->msg_namelen = sizeof(*uaddr);
|
|
}
|
|
if (llc_sk(sk)->cmsg_flags)
|
|
llc_cmsg_rcv(msg, skb);
|
|
|
|
if (!(flags & MSG_PEEK)) {
|
|
skb_unlink(skb, &sk->sk_receive_queue);
|
|
kfree_skb(skb);
|
|
*seq = 0;
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_sendmsg - Transmit data provided by the socket user.
|
|
* @sock: Socket to transmit data from.
|
|
* @msg: Various user related information.
|
|
* @len: Length of data to transmit.
|
|
*
|
|
* Transmit data provided by the socket user.
|
|
* Returns non-negative upon success, negative otherwise.
|
|
*/
|
|
static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
|
|
int flags = msg->msg_flags;
|
|
int noblock = flags & MSG_DONTWAIT;
|
|
struct sk_buff *skb = NULL;
|
|
size_t size = 0;
|
|
int rc = -EINVAL, copied = 0, hdrlen;
|
|
|
|
dprintk("%s: sending from %02X to %02X\n", __func__,
|
|
llc->laddr.lsap, llc->daddr.lsap);
|
|
lock_sock(sk);
|
|
if (addr) {
|
|
if (msg->msg_namelen < sizeof(*addr))
|
|
goto out;
|
|
} else {
|
|
if (llc_ui_addr_null(&llc->addr))
|
|
goto out;
|
|
addr = &llc->addr;
|
|
}
|
|
/* must bind connection to sap if user hasn't done it. */
|
|
if (sock_flag(sk, SOCK_ZAPPED)) {
|
|
/* bind to sap with null dev, exclusive. */
|
|
rc = llc_ui_autobind(sock, addr);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
|
|
size = hdrlen + len;
|
|
if (size > llc->dev->mtu)
|
|
size = llc->dev->mtu;
|
|
copied = size - hdrlen;
|
|
rc = -EINVAL;
|
|
if (copied < 0)
|
|
goto out;
|
|
release_sock(sk);
|
|
skb = sock_alloc_send_skb(sk, size, noblock, &rc);
|
|
lock_sock(sk);
|
|
if (!skb)
|
|
goto out;
|
|
skb->dev = llc->dev;
|
|
skb->protocol = llc_proto_type(addr->sllc_arphrd);
|
|
skb_reserve(skb, hdrlen);
|
|
rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
|
|
if (rc)
|
|
goto out;
|
|
if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
|
|
llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
|
|
addr->sllc_sap);
|
|
skb = NULL;
|
|
goto out;
|
|
}
|
|
if (addr->sllc_test) {
|
|
llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
|
|
addr->sllc_sap);
|
|
skb = NULL;
|
|
goto out;
|
|
}
|
|
if (addr->sllc_xid) {
|
|
llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
|
|
addr->sllc_sap);
|
|
skb = NULL;
|
|
goto out;
|
|
}
|
|
rc = -ENOPROTOOPT;
|
|
if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
|
|
goto out;
|
|
rc = llc_ui_send_data(sk, skb, noblock);
|
|
skb = NULL;
|
|
out:
|
|
kfree_skb(skb);
|
|
if (rc)
|
|
dprintk("%s: failed sending from %02X to %02X: %d\n",
|
|
__func__, llc->laddr.lsap, llc->daddr.lsap, rc);
|
|
release_sock(sk);
|
|
return rc ? : copied;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_getname - return the address info of a socket
|
|
* @sock: Socket to get address of.
|
|
* @uaddr: Address structure to return information.
|
|
* @uaddrlen: Length of address structure.
|
|
* @peer: Does user want local or remote address information.
|
|
*
|
|
* Return the address information of a socket.
|
|
*/
|
|
static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int peer)
|
|
{
|
|
struct sockaddr_llc sllc;
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
int rc = -EBADF;
|
|
|
|
memset(&sllc, 0, sizeof(sllc));
|
|
lock_sock(sk);
|
|
if (sock_flag(sk, SOCK_ZAPPED))
|
|
goto out;
|
|
if (peer) {
|
|
rc = -ENOTCONN;
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
goto out;
|
|
if(llc->dev)
|
|
sllc.sllc_arphrd = llc->dev->type;
|
|
sllc.sllc_sap = llc->daddr.lsap;
|
|
memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
|
|
} else {
|
|
rc = -EINVAL;
|
|
if (!llc->sap)
|
|
goto out;
|
|
sllc.sllc_sap = llc->sap->laddr.lsap;
|
|
|
|
if (llc->dev) {
|
|
sllc.sllc_arphrd = llc->dev->type;
|
|
memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
|
|
IFHWADDRLEN);
|
|
}
|
|
}
|
|
sllc.sllc_family = AF_LLC;
|
|
memcpy(uaddr, &sllc, sizeof(sllc));
|
|
rc = sizeof(sllc);
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_ioctl - io controls for PF_LLC
|
|
* @sock: Socket to get/set info
|
|
* @cmd: command
|
|
* @arg: optional argument for cmd
|
|
*
|
|
* get/set info on llc sockets
|
|
*/
|
|
static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_setsockopt - set various connection specific parameters.
|
|
* @sock: Socket to set options on.
|
|
* @level: Socket level user is requesting operations on.
|
|
* @optname: Operation name.
|
|
* @optval: User provided operation data.
|
|
* @optlen: Length of optval.
|
|
*
|
|
* Set various connection specific parameters.
|
|
*/
|
|
static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
unsigned int opt;
|
|
int rc = -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
|
|
goto out;
|
|
rc = get_user(opt, (int __user *)optval);
|
|
if (rc)
|
|
goto out;
|
|
rc = -EINVAL;
|
|
switch (optname) {
|
|
case LLC_OPT_RETRY:
|
|
if (opt > LLC_OPT_MAX_RETRY)
|
|
goto out;
|
|
llc->n2 = opt;
|
|
break;
|
|
case LLC_OPT_SIZE:
|
|
if (opt > LLC_OPT_MAX_SIZE)
|
|
goto out;
|
|
llc->n1 = opt;
|
|
break;
|
|
case LLC_OPT_ACK_TMR_EXP:
|
|
if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
|
|
goto out;
|
|
llc->ack_timer.expire = opt * HZ;
|
|
break;
|
|
case LLC_OPT_P_TMR_EXP:
|
|
if (opt > LLC_OPT_MAX_P_TMR_EXP)
|
|
goto out;
|
|
llc->pf_cycle_timer.expire = opt * HZ;
|
|
break;
|
|
case LLC_OPT_REJ_TMR_EXP:
|
|
if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
|
|
goto out;
|
|
llc->rej_sent_timer.expire = opt * HZ;
|
|
break;
|
|
case LLC_OPT_BUSY_TMR_EXP:
|
|
if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
|
|
goto out;
|
|
llc->busy_state_timer.expire = opt * HZ;
|
|
break;
|
|
case LLC_OPT_TX_WIN:
|
|
if (opt > LLC_OPT_MAX_WIN)
|
|
goto out;
|
|
llc->k = opt;
|
|
break;
|
|
case LLC_OPT_RX_WIN:
|
|
if (opt > LLC_OPT_MAX_WIN)
|
|
goto out;
|
|
llc->rw = opt;
|
|
break;
|
|
case LLC_OPT_PKTINFO:
|
|
if (opt)
|
|
llc->cmsg_flags |= LLC_CMSG_PKTINFO;
|
|
else
|
|
llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
|
|
break;
|
|
default:
|
|
rc = -ENOPROTOOPT;
|
|
goto out;
|
|
}
|
|
rc = 0;
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* llc_ui_getsockopt - get connection specific socket info
|
|
* @sock: Socket to get information from.
|
|
* @level: Socket level user is requesting operations on.
|
|
* @optname: Operation name.
|
|
* @optval: Variable to return operation data in.
|
|
* @optlen: Length of optval.
|
|
*
|
|
* Get connection specific socket information.
|
|
*/
|
|
static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct llc_sock *llc = llc_sk(sk);
|
|
int val = 0, len = 0, rc = -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(level != SOL_LLC))
|
|
goto out;
|
|
rc = get_user(len, optlen);
|
|
if (rc)
|
|
goto out;
|
|
rc = -EINVAL;
|
|
if (len != sizeof(int))
|
|
goto out;
|
|
switch (optname) {
|
|
case LLC_OPT_RETRY:
|
|
val = llc->n2; break;
|
|
case LLC_OPT_SIZE:
|
|
val = llc->n1; break;
|
|
case LLC_OPT_ACK_TMR_EXP:
|
|
val = llc->ack_timer.expire / HZ; break;
|
|
case LLC_OPT_P_TMR_EXP:
|
|
val = llc->pf_cycle_timer.expire / HZ; break;
|
|
case LLC_OPT_REJ_TMR_EXP:
|
|
val = llc->rej_sent_timer.expire / HZ; break;
|
|
case LLC_OPT_BUSY_TMR_EXP:
|
|
val = llc->busy_state_timer.expire / HZ; break;
|
|
case LLC_OPT_TX_WIN:
|
|
val = llc->k; break;
|
|
case LLC_OPT_RX_WIN:
|
|
val = llc->rw; break;
|
|
case LLC_OPT_PKTINFO:
|
|
val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
|
|
break;
|
|
default:
|
|
rc = -ENOPROTOOPT;
|
|
goto out;
|
|
}
|
|
rc = 0;
|
|
if (put_user(len, optlen) || copy_to_user(optval, &val, len))
|
|
rc = -EFAULT;
|
|
out:
|
|
release_sock(sk);
|
|
return rc;
|
|
}
|
|
|
|
static const struct net_proto_family llc_ui_family_ops = {
|
|
.family = PF_LLC,
|
|
.create = llc_ui_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct proto_ops llc_ui_ops = {
|
|
.family = PF_LLC,
|
|
.owner = THIS_MODULE,
|
|
.release = llc_ui_release,
|
|
.bind = llc_ui_bind,
|
|
.connect = llc_ui_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = llc_ui_accept,
|
|
.getname = llc_ui_getname,
|
|
.poll = datagram_poll,
|
|
.ioctl = llc_ui_ioctl,
|
|
.listen = llc_ui_listen,
|
|
.shutdown = llc_ui_shutdown,
|
|
.setsockopt = llc_ui_setsockopt,
|
|
.getsockopt = llc_ui_getsockopt,
|
|
.sendmsg = llc_ui_sendmsg,
|
|
.recvmsg = llc_ui_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static const char llc_proc_err_msg[] __initconst =
|
|
KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
|
|
static const char llc_sysctl_err_msg[] __initconst =
|
|
KERN_CRIT "LLC: Unable to register the sysctl entries\n";
|
|
static const char llc_sock_err_msg[] __initconst =
|
|
KERN_CRIT "LLC: Unable to register the network family\n";
|
|
|
|
static int __init llc2_init(void)
|
|
{
|
|
int rc = proto_register(&llc_proto, 0);
|
|
|
|
if (rc != 0)
|
|
goto out;
|
|
|
|
llc_build_offset_table();
|
|
llc_station_init();
|
|
llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
|
|
rc = llc_proc_init();
|
|
if (rc != 0) {
|
|
printk(llc_proc_err_msg);
|
|
goto out_station;
|
|
}
|
|
rc = llc_sysctl_init();
|
|
if (rc) {
|
|
printk(llc_sysctl_err_msg);
|
|
goto out_proc;
|
|
}
|
|
rc = sock_register(&llc_ui_family_ops);
|
|
if (rc) {
|
|
printk(llc_sock_err_msg);
|
|
goto out_sysctl;
|
|
}
|
|
llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
|
|
llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
|
|
out:
|
|
return rc;
|
|
out_sysctl:
|
|
llc_sysctl_exit();
|
|
out_proc:
|
|
llc_proc_exit();
|
|
out_station:
|
|
llc_station_exit();
|
|
proto_unregister(&llc_proto);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit llc2_exit(void)
|
|
{
|
|
llc_station_exit();
|
|
llc_remove_pack(LLC_DEST_SAP);
|
|
llc_remove_pack(LLC_DEST_CONN);
|
|
sock_unregister(PF_LLC);
|
|
llc_proc_exit();
|
|
llc_sysctl_exit();
|
|
proto_unregister(&llc_proto);
|
|
}
|
|
|
|
module_init(llc2_init);
|
|
module_exit(llc2_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
|
|
MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
|
|
MODULE_ALIAS_NETPROTO(PF_LLC);
|