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1275 lines
31 KiB
1275 lines
31 KiB
/* |
|
* 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. |
|
* |
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* Copyright (c) 2001 by Jay Schulist <[email protected]> |
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* 2002-2003 by Arnaldo Carvalho de Melo <[email protected]> |
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* |
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* This program can be redistributed or modified under the terms of the |
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* GNU General Public License as published by the Free Software Foundation. |
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* This program is distributed without any warranty or implied warranty |
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* of merchantability or fitness for a particular purpose. |
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* |
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* See the GNU General Public License for more details. |
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*/ |
|
#include <linux/compiler.h> |
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/rtnetlink.h> |
|
#include <linux/init.h> |
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#include <linux/slab.h> |
|
#include <linux/sched/signal.h> |
|
|
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#include <net/llc.h> |
|
#include <net/llc_sap.h> |
|
#include <net/llc_pdu.h> |
|
#include <net/llc_conn.h> |
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#include <net/tcp_states.h> |
|
|
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/* remember: uninitialized global data is zeroed because its in .bss */ |
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static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
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static u16 llc_ui_sap_link_no_max[256]; |
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static struct sockaddr_llc llc_ui_addrnull; |
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static const struct proto_ops llc_ui_ops; |
|
|
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static bool llc_ui_wait_for_conn(struct sock *sk, long timeout); |
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static int llc_ui_wait_for_disc(struct sock *sk, long timeout); |
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static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
|
|
|
#if 0 |
|
#define dprintk(args...) printk(KERN_DEBUG args) |
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#else |
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#define dprintk(args...) do {} while (0) |
|
#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. |
|
* |
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* Return the next unused link number for a given sap. |
|
*/ |
|
static inline u16 llc_ui_next_link_no(int sap) |
|
{ |
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return llc_ui_sap_link_no_max[sap]++; |
|
} |
|
|
|
/** |
|
* llc_proto_type - return eth protocol for ARP header type |
|
* @arphrd: ARP header type. |
|
* |
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* 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. |
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* |
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* Provide the length of the llc header depending on what kind of |
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* 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; |
|
|
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if (addr->sllc_test || addr->sllc_xid) |
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rc = LLC_PDU_LEN_U; |
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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? |
|
* |
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* 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. |
|
*/ |
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static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) |
|
{ |
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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); |
|
} |
|
|
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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; |
|
} |
|
|
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static struct proto llc_proto = { |
|
.name = "LLC", |
|
.owner = THIS_MODULE, |
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.obj_size = sizeof(struct llc_sock), |
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.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. |
|
*/ |
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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)) |
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return -EPERM; |
|
|
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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; |
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llc_ui_sk_init(sock, sk); |
|
} |
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} |
|
return rc; |
|
} |
|
|
|
/** |
|
* llc_ui_release - shutdown socket |
|
* @sock: Socket to release. |
|
* |
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* Shutdown and deallocate an existing socket. |
|
*/ |
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static int llc_ui_release(struct socket *sock) |
|
{ |
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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); |
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dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
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llc->laddr.lsap, llc->daddr.lsap); |
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if (!llc_send_disc(sk)) |
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llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); |
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if (!sock_flag(sk, SOCK_ZAPPED)) { |
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struct llc_sap *sap = llc->sap; |
|
|
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/* Hold this for release_sock(), so that llc_backlog_rcv() |
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* could still use it. |
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*/ |
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llc_sap_hold(sap); |
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llc_sap_remove_socket(llc->sap, sk); |
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release_sock(sk); |
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llc_sap_put(sap); |
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} else { |
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release_sock(sk); |
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} |
|
if (llc->dev) |
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dev_put(llc->dev); |
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sock_put(sk); |
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llc_sk_free(sk); |
|
out: |
|
return 0; |
|
} |
|
|
|
/** |
|
* llc_ui_autoport - provide dynamically allocate SAP number |
|
* |
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* 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; |
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tries++; |
|
} |
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i = 0; |
|
out: |
|
return i; |
|
} |
|
|
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/** |
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* llc_ui_autobind - automatically bind a socket to a sap |
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* @sock: socket to bind |
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* @addr: address to connect to |
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* |
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* Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't |
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* specifically used llc_ui_bind to bind to an specific address/sap |
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* |
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* 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; |
|
if (!addr->sllc_arphrd) |
|
addr->sllc_arphrd = ARPHRD_ETHER; |
|
if (addr->sllc_arphrd != ARPHRD_ETHER) |
|
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) { |
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dev_put(llc->dev); |
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llc->dev = NULL; |
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} |
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} else |
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llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); |
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if (!llc->dev) |
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goto out; |
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rc = -EUSERS; |
|
llc->laddr.lsap = llc_ui_autoport(); |
|
if (!llc->laddr.lsap) |
|
goto out; |
|
rc = -EBUSY; /* some other network layer is using the sap */ |
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sap = llc_sap_open(llc->laddr.lsap, NULL); |
|
if (!sap) |
|
goto out; |
|
memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); |
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memcpy(&llc->addr, addr, sizeof(llc->addr)); |
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/* assign new connection to its SAP */ |
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llc_sap_add_socket(sap, sk); |
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sock_reset_flag(sk, SOCK_ZAPPED); |
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rc = 0; |
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out: |
|
return rc; |
|
} |
|
|
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/** |
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* llc_ui_bind - bind a socket to a specific address. |
|
* @sock: Socket to bind an address to. |
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* @uaddr: Address the user wants the socket bound to. |
|
* @addrlen: Length of the uaddr structure. |
|
* |
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* 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. |
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* Bind and autobind for that matter must enforce the correct sap usage |
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* otherwise all hell will break loose. |
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* Returns: 0 upon success, negative otherwise. |
|
*/ |
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static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) |
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{ |
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struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; |
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struct sock *sk = sock->sk; |
|
struct llc_sock *llc = llc_sk(sk); |
|
struct llc_sap *sap; |
|
int rc = -EINVAL; |
|
|
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lock_sock(sk); |
|
if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
|
goto out; |
|
rc = -EAFNOSUPPORT; |
|
if (!addr->sllc_arphrd) |
|
addr->sllc_arphrd = ARPHRD_ETHER; |
|
if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER)) |
|
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 (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. |
|
* @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, |
|
sockptr_t 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 = copy_from_sockptr(&opt, optval, sizeof(opt)); |
|
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);
|
|
|