1080 lines
28 KiB
C
1080 lines
28 KiB
C
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/*
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* af_llc.c - LLC User Interface SAPs
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* Description:
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* Functions in this module are implementation of socket based llc
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* communications for the Linux operating system. Support of llc class
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* one and class two is provided via SOCK_DGRAM and SOCK_STREAM
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* respectively.
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*
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* An llc2 connection is (mac + sap), only one llc2 sap connection
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* is allowed per mac. Though one sap may have multiple mac + sap
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* connections.
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*
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* Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
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* 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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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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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/tcp.h>
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#include <linux/rtnetlink.h>
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#include <linux/init.h>
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#include <net/llc.h>
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#include <net/llc_sap.h>
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#include <net/llc_pdu.h>
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#include <net/llc_conn.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 struct proto_ops llc_ui_ops;
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static int llc_ui_wait_for_conn(struct sock *sk, int timeout);
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static int llc_ui_wait_for_disc(struct sock *sk, int timeout);
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static int llc_ui_wait_for_data(struct sock *sk, int timeout);
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static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout);
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#if 0
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#define dprintk(args...) printk(KERN_DEBUG args)
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#else
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#define dprintk(args...)
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#endif
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/**
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* llc_ui_next_link_no - return the next unused link number for a sap
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* @sap: Address of sap to get link number from.
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*
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* Return the next unused link number for a given sap.
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*/
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static __inline__ u16 llc_ui_next_link_no(int sap)
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{
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return llc_ui_sap_link_no_max[sap]++;
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}
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/**
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* llc_proto_type - return eth protocol for ARP header type
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* @arphrd: ARP header type.
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*
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* Given an ARP header type return the corresponding ethernet protocol.
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*/
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static __inline__ u16 llc_proto_type(u16 arphrd)
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{
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return arphrd == ARPHRD_IEEE802_TR ?
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htons(ETH_P_TR_802_2) : htons(ETH_P_802_2);
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}
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/**
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* llc_ui_addr_null - determines if a address structure is null
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* @addr: Address to test if null.
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*/
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static __inline__ u8 llc_ui_addr_null(struct sockaddr_llc *addr)
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{
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return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
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}
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/**
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* llc_ui_header_len - return length of llc header based on operation
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* @sk: Socket which contains a valid llc socket type.
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* @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.
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* Returns the correct llc header length.
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*/
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static __inline__ u8 llc_ui_header_len(struct sock *sk,
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struct sockaddr_llc *addr)
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{
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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)
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rc = LLC_PDU_LEN_I;
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return rc;
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}
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/**
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* llc_ui_send_data - send data via reliable llc2 connection
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* @sk: Connection the socket is using.
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* @skb: Data the user wishes to send.
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* @addr: Source and destination fields provided by the user.
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* @noblock: can we block waiting for data?
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*
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* Send data via reliable llc2 connection.
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* Returns 0 upon success, non-zero if action did not succeed.
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*/
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static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
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{
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struct llc_sock* llc = llc_sk(sk);
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int rc = 0;
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if (llc_data_accept_state(llc->state) || llc->p_flag) {
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int timeout = sock_sndtimeo(sk, noblock);
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rc = llc_ui_wait_for_busy_core(sk, timeout);
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}
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if (!rc)
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rc = llc_build_and_send_pkt(sk, skb);
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return rc;
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}
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static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
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{
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sk->sk_type = sock->type;
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sk->sk_sleep = &sock->wait;
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sk->sk_socket = sock;
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sock->sk = sk;
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sock->ops = &llc_ui_ops;
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}
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static struct proto llc_proto = {
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.name = "DDP",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct llc_sock),
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};
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/**
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* llc_ui_create - alloc and init a new llc_ui socket
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* @sock: Socket to initialize and attach allocated sk to.
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* @protocol: Unused.
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*
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* Allocate and initialize a new llc_ui socket, validate the user wants a
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* socket type we have available.
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* Returns 0 upon success, negative upon failure.
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*/
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static int llc_ui_create(struct socket *sock, int protocol)
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{
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struct sock *sk;
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int rc = -ESOCKTNOSUPPORT;
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if (sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM) {
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rc = -ENOMEM;
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sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto);
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if (sk) {
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rc = 0;
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llc_ui_sk_init(sock, sk);
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}
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}
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return rc;
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}
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/**
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* llc_ui_release - shutdown socket
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* @sock: Socket to release.
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*
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* Shutdown and deallocate an existing socket.
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*/
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static int llc_ui_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct llc_sock *llc;
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if (!sk)
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goto out;
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sock_hold(sk);
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lock_sock(sk);
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llc = llc_sk(sk);
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dprintk("%s: closing local(%02X) remote(%02X)\n", __FUNCTION__,
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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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llc_sap_remove_socket(llc->sap, sk);
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release_sock(sk);
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if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) {
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llc_release_sockets(llc->sap);
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llc_sap_close(llc->sap);
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}
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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);
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out:
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return 0;
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}
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/**
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* llc_ui_autoport - provide dynamically allocate SAP number
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*
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* Provide the caller with a dynamically allocated SAP number according
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* to the rules that are set in this function. Returns: 0, upon failure,
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* SAP number otherwise.
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*/
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static int llc_ui_autoport(void)
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{
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struct llc_sap *sap;
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int i, tries = 0;
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while (tries < LLC_SAP_DYN_TRIES) {
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for (i = llc_ui_sap_last_autoport;
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i < LLC_SAP_DYN_STOP; i += 2) {
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sap = llc_sap_find(i);
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if (!sap) {
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llc_ui_sap_last_autoport = i + 2;
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goto out;
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}
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}
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llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
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tries++;
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}
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i = 0;
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out:
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return i;
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}
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/**
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* llc_ui_autobind - Bind a socket to a specific address.
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* @sk: Socket to bind an address to.
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* @addr: Address the user wants the socket bound to.
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*
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* Bind a socket to a specific address. For llc a user is able to bind to
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* a specific sap only or mac + sap. If the user only specifies a sap and
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* a null dmac (all zeros) the user is attempting to bind to an entire
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* sap. This will stop anyone else on the local system from using that
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* sap. If someone else has a mac + sap open the bind to null + sap will
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* fail.
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* If the user desires to bind to a specific mac + sap, it is possible to
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* 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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*/
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static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
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{
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struct sock *sk = sock->sk;
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struct llc_sock *llc = llc_sk(sk);
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struct llc_sap *sap;
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int rc = -EINVAL;
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if (!sock_flag(sk, SOCK_ZAPPED))
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goto out;
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rc = -ENODEV;
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llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd);
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if (!llc->dev)
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goto out;
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rc = -EUSERS;
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llc->laddr.lsap = llc_ui_autoport();
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if (!llc->laddr.lsap)
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goto out;
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rc = -EBUSY; /* some other network layer is using the sap */
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sap = llc_sap_open(llc->laddr.lsap, NULL);
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if (!sap)
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goto out;
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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:
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return rc;
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}
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/**
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* llc_ui_bind - bind a socket to a specific address.
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* @sock: Socket to bind an address to.
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* @uaddr: Address the user wants the socket bound to.
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* @addrlen: Length of the uaddr structure.
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*
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* Bind a socket to a specific address. For llc a user is able to bind to
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* a specific sap only or mac + sap. If the user only specifies a sap and
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* a null dmac (all zeros) the user is attempting to bind to an entire
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* sap. This will stop anyone else on the local system from using that
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* sap. If someone else has a mac + sap open the bind to null + sap will
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* fail.
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* If the user desires to bind to a specific mac + sap, it is possible to
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* 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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*/
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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;
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struct llc_sock *llc = llc_sk(sk);
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struct llc_sap *sap;
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int rc = -EINVAL;
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dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap);
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if (!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))
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goto out;
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rc = -EAFNOSUPPORT;
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if (addr->sllc_family != AF_LLC)
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goto out;
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if (!addr->sllc_sap) {
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rc = -EUSERS;
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addr->sllc_sap = llc_ui_autoport();
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if (!addr->sllc_sap)
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goto out;
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}
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sap = llc_sap_find(addr->sllc_sap);
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if (!sap) {
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sap = llc_sap_open(addr->sllc_sap, NULL);
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rc = -EBUSY; /* some other network layer is using the sap */
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if (!sap)
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goto out;
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} else {
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struct llc_addr laddr, daddr;
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struct sock *ask;
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memset(&laddr, 0, sizeof(laddr));
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memset(&daddr, 0, sizeof(daddr));
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/*
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* FIXME: check if the the address is multicast,
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* only SOCK_DGRAM can do this.
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*/
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memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
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laddr.lsap = addr->sllc_sap;
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rc = -EADDRINUSE; /* mac + sap clash. */
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ask = llc_lookup_established(sap, &daddr, &laddr);
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if (ask) {
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sock_put(ask);
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goto out;
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}
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}
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llc->laddr.lsap = addr->sllc_sap;
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memcpy(llc->laddr.mac, addr->sllc_mac, 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:
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return rc;
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||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 (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;
|
||
|
|
struct net_device *dev;
|
||
|
|
int rc = -EINVAL;
|
||
|
|
|
||
|
|
lock_sock(sk);
|
||
|
|
if (addrlen != sizeof(*addr))
|
||
|
|
goto out;
|
||
|
|
rc = -EAFNOSUPPORT;
|
||
|
|
if (addr->sllc_family != AF_LLC)
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
dev = llc->dev;
|
||
|
|
if (sk->sk_type != SOCK_STREAM)
|
||
|
|
goto out;
|
||
|
|
rc = -EALREADY;
|
||
|
|
if (sock->state == SS_CONNECTING)
|
||
|
|
goto out;
|
||
|
|
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, dev->dev_addr,
|
||
|
|
addr->sllc_mac, addr->sllc_sap);
|
||
|
|
if (rc) {
|
||
|
|
dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__);
|
||
|
|
sock->state = SS_UNCONNECTED;
|
||
|
|
sk->sk_state = TCP_CLOSE;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
rc = llc_ui_wait_for_conn(sk, sk->sk_rcvtimeo);
|
||
|
|
if (rc)
|
||
|
|
dprintk("%s: llc_ui_wait_for_conn failed=%d\n", __FUNCTION__, rc);
|
||
|
|
out:
|
||
|
|
release_sock(sk);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 (sock->state != SS_UNCONNECTED)
|
||
|
|
goto out;
|
||
|
|
rc = -EOPNOTSUPP;
|
||
|
|
if (sk->sk_type != SOCK_STREAM)
|
||
|
|
goto out;
|
||
|
|
rc = -EAGAIN;
|
||
|
|
if (sock_flag(sk, SOCK_ZAPPED))
|
||
|
|
goto out;
|
||
|
|
rc = 0;
|
||
|
|
if (!(unsigned)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, int timeout)
|
||
|
|
{
|
||
|
|
DECLARE_WAITQUEUE(wait, current);
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
||
|
|
for (;;) {
|
||
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
||
|
|
rc = 0;
|
||
|
|
if (sk->sk_state != TCP_CLOSE) {
|
||
|
|
release_sock(sk);
|
||
|
|
timeout = schedule_timeout(timeout);
|
||
|
|
lock_sock(sk);
|
||
|
|
} else
|
||
|
|
break;
|
||
|
|
rc = -ERESTARTSYS;
|
||
|
|
if (signal_pending(current))
|
||
|
|
break;
|
||
|
|
rc = -EAGAIN;
|
||
|
|
if (!timeout)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
__set_current_state(TASK_RUNNING);
|
||
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int llc_ui_wait_for_conn(struct sock *sk, int timeout)
|
||
|
|
{
|
||
|
|
DECLARE_WAITQUEUE(wait, current);
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
||
|
|
for (;;) {
|
||
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
||
|
|
rc = -EAGAIN;
|
||
|
|
if (sk->sk_state == TCP_CLOSE)
|
||
|
|
break;
|
||
|
|
rc = 0;
|
||
|
|
if (sk->sk_state != TCP_ESTABLISHED) {
|
||
|
|
release_sock(sk);
|
||
|
|
timeout = schedule_timeout(timeout);
|
||
|
|
lock_sock(sk);
|
||
|
|
} else
|
||
|
|
break;
|
||
|
|
rc = -ERESTARTSYS;
|
||
|
|
if (signal_pending(current))
|
||
|
|
break;
|
||
|
|
rc = -EAGAIN;
|
||
|
|
if (!timeout)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
__set_current_state(TASK_RUNNING);
|
||
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int llc_ui_wait_for_data(struct sock *sk, int timeout)
|
||
|
|
{
|
||
|
|
DECLARE_WAITQUEUE(wait, current);
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
||
|
|
for (;;) {
|
||
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
||
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
||
|
|
break;
|
||
|
|
/*
|
||
|
|
* Well, if we have backlog, try to process it now.
|
||
|
|
*/
|
||
|
|
if (sk->sk_backlog.tail) {
|
||
|
|
release_sock(sk);
|
||
|
|
lock_sock(sk);
|
||
|
|
}
|
||
|
|
rc = 0;
|
||
|
|
if (skb_queue_empty(&sk->sk_receive_queue)) {
|
||
|
|
release_sock(sk);
|
||
|
|
timeout = schedule_timeout(timeout);
|
||
|
|
lock_sock(sk);
|
||
|
|
} else
|
||
|
|
break;
|
||
|
|
rc = -ERESTARTSYS;
|
||
|
|
if (signal_pending(current))
|
||
|
|
break;
|
||
|
|
rc = -EAGAIN;
|
||
|
|
if (!timeout)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
__set_current_state(TASK_RUNNING);
|
||
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout)
|
||
|
|
{
|
||
|
|
DECLARE_WAITQUEUE(wait, current);
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
add_wait_queue_exclusive(sk->sk_sleep, &wait);
|
||
|
|
for (;;) {
|
||
|
|
dprintk("%s: looping...\n", __FUNCTION__);
|
||
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
||
|
|
rc = -ENOTCONN;
|
||
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
||
|
|
break;
|
||
|
|
rc = 0;
|
||
|
|
if (llc_data_accept_state(llc->state) || llc->p_flag) {
|
||
|
|
release_sock(sk);
|
||
|
|
timeout = schedule_timeout(timeout);
|
||
|
|
lock_sock(sk);
|
||
|
|
} else
|
||
|
|
break;
|
||
|
|
rc = -ERESTARTSYS;
|
||
|
|
if (signal_pending(current))
|
||
|
|
break;
|
||
|
|
rc = -EAGAIN;
|
||
|
|
if (!timeout)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
__set_current_state(TASK_RUNNING);
|
||
|
|
remove_wait_queue(sk->sk_sleep, &wait);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* Accept a new incoming connection.
|
||
|
|
* Returns 0 upon success, negative otherwise.
|
||
|
|
*/
|
||
|
|
static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
|
||
|
|
{
|
||
|
|
struct sock *sk = sock->sk, *newsk;
|
||
|
|
struct llc_sock *llc, *newllc;
|
||
|
|
struct sk_buff *skb;
|
||
|
|
int rc = -EOPNOTSUPP;
|
||
|
|
|
||
|
|
dprintk("%s: accepting on %02X\n", __FUNCTION__,
|
||
|
|
llc_sk(sk)->laddr.lsap);
|
||
|
|
lock_sock(sk);
|
||
|
|
if (sk->sk_type != SOCK_STREAM)
|
||
|
|
goto out;
|
||
|
|
rc = -EINVAL;
|
||
|
|
if (sock->state != SS_UNCONNECTED || sk->sk_state != TCP_LISTEN)
|
||
|
|
goto out;
|
||
|
|
/* wait for a connection to arrive. */
|
||
|
|
rc = llc_ui_wait_for_data(sk, sk->sk_rcvtimeo);
|
||
|
|
if (rc)
|
||
|
|
goto out;
|
||
|
|
dprintk("%s: got a new connection on %02X\n", __FUNCTION__,
|
||
|
|
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->sk_ack_backlog--;
|
||
|
|
skb->sk = NULL;
|
||
|
|
dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__,
|
||
|
|
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.
|
||
|
|
* @size: 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 kiocb *iocb, struct socket *sock,
|
||
|
|
struct msghdr *msg, size_t size, int flags)
|
||
|
|
{
|
||
|
|
struct sock *sk = sock->sk;
|
||
|
|
struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
|
||
|
|
struct sk_buff *skb;
|
||
|
|
size_t copied = 0;
|
||
|
|
int rc = -ENOMEM, timeout;
|
||
|
|
int noblock = flags & MSG_DONTWAIT;
|
||
|
|
|
||
|
|
dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__,
|
||
|
|
llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
|
||
|
|
lock_sock(sk);
|
||
|
|
timeout = sock_rcvtimeo(sk, noblock);
|
||
|
|
rc = llc_ui_wait_for_data(sk, timeout);
|
||
|
|
if (rc) {
|
||
|
|
dprintk("%s: llc_ui_wait_for_data failed recv "
|
||
|
|
"in %02X from %02X\n", __FUNCTION__,
|
||
|
|
llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
skb = skb_dequeue(&sk->sk_receive_queue);
|
||
|
|
if (!skb) /* shutdown */
|
||
|
|
goto out;
|
||
|
|
copied = skb->len;
|
||
|
|
if (copied > size)
|
||
|
|
copied = size;
|
||
|
|
rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
||
|
|
if (rc)
|
||
|
|
goto dgram_free;
|
||
|
|
if (skb->len > copied) {
|
||
|
|
skb_pull(skb, copied);
|
||
|
|
skb_queue_head(&sk->sk_receive_queue, skb);
|
||
|
|
}
|
||
|
|
if (uaddr)
|
||
|
|
memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
|
||
|
|
msg->msg_namelen = sizeof(*uaddr);
|
||
|
|
if (!skb->list) {
|
||
|
|
dgram_free:
|
||
|
|
kfree_skb(skb);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
release_sock(sk);
|
||
|
|
return rc ? : copied;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 kiocb *iocb, struct socket *sock,
|
||
|
|
struct msghdr *msg, size_t len)
|
||
|
|
{
|
||
|
|
struct sock *sk = sock->sk;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
|
||
|
|
int flags = msg->msg_flags;
|
||
|
|
int noblock = flags & MSG_DONTWAIT;
|
||
|
|
struct net_device *dev;
|
||
|
|
struct sk_buff *skb;
|
||
|
|
size_t size = 0;
|
||
|
|
int rc = -EINVAL, copied = 0, hdrlen;
|
||
|
|
|
||
|
|
dprintk("%s: sending from %02X to %02X\n", __FUNCTION__,
|
||
|
|
llc->laddr.lsap, llc->daddr.lsap);
|
||
|
|
lock_sock(sk);
|
||
|
|
if (addr) {
|
||
|
|
if (msg->msg_namelen < sizeof(*addr))
|
||
|
|
goto release;
|
||
|
|
} else {
|
||
|
|
if (llc_ui_addr_null(&llc->addr))
|
||
|
|
goto release;
|
||
|
|
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 release;
|
||
|
|
}
|
||
|
|
dev = llc->dev;
|
||
|
|
hdrlen = dev->hard_header_len + llc_ui_header_len(sk, addr);
|
||
|
|
size = hdrlen + len;
|
||
|
|
if (size > dev->mtu)
|
||
|
|
size = dev->mtu;
|
||
|
|
copied = size - hdrlen;
|
||
|
|
release_sock(sk);
|
||
|
|
skb = sock_alloc_send_skb(sk, size, noblock, &rc);
|
||
|
|
lock_sock(sk);
|
||
|
|
if (!skb)
|
||
|
|
goto release;
|
||
|
|
skb->sk = sk;
|
||
|
|
skb->dev = dev;
|
||
|
|
skb->protocol = llc_proto_type(addr->sllc_arphrd);
|
||
|
|
skb_reserve(skb, hdrlen);
|
||
|
|
rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, 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);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
if (addr->sllc_test) {
|
||
|
|
llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
|
||
|
|
addr->sllc_sap);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
if (addr->sllc_xid) {
|
||
|
|
llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
|
||
|
|
addr->sllc_sap);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
rc = -ENOPROTOOPT;
|
||
|
|
if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
|
||
|
|
goto out;
|
||
|
|
rc = llc_ui_send_data(sk, skb, noblock);
|
||
|
|
if (rc)
|
||
|
|
dprintk("%s: llc_ui_send_data failed: %d\n", __FUNCTION__, rc);
|
||
|
|
out:
|
||
|
|
if (rc)
|
||
|
|
kfree_skb(skb);
|
||
|
|
release:
|
||
|
|
if (rc)
|
||
|
|
dprintk("%s: failed sending from %02X to %02X: %d\n",
|
||
|
|
__FUNCTION__, 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 *uaddrlen, int peer)
|
||
|
|
{
|
||
|
|
struct sockaddr_llc sllc;
|
||
|
|
struct sock *sk = sock->sk;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
lock_sock(sk);
|
||
|
|
if (sock_flag(sk, SOCK_ZAPPED))
|
||
|
|
goto out;
|
||
|
|
*uaddrlen = sizeof(sllc);
|
||
|
|
memset(uaddr, 0, *uaddrlen);
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
rc = 0;
|
||
|
|
sllc.sllc_family = AF_LLC;
|
||
|
|
memcpy(uaddr, &sllc, 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 dev_ioctl(cmd, (void __user *)arg);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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, int optlen)
|
||
|
|
{
|
||
|
|
struct sock *sk = sock->sk;
|
||
|
|
struct llc_sock *llc = llc_sk(sk);
|
||
|
|
int rc = -EINVAL, opt;
|
||
|
|
|
||
|
|
lock_sock(sk);
|
||
|
|
if (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;
|
||
|
|
break;
|
||
|
|
case LLC_OPT_P_TMR_EXP:
|
||
|
|
if (opt > LLC_OPT_MAX_P_TMR_EXP)
|
||
|
|
goto out;
|
||
|
|
llc->pf_cycle_timer.expire = opt;
|
||
|
|
break;
|
||
|
|
case LLC_OPT_REJ_TMR_EXP:
|
||
|
|
if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
|
||
|
|
goto out;
|
||
|
|
llc->rej_sent_timer.expire = opt;
|
||
|
|
break;
|
||
|
|
case LLC_OPT_BUSY_TMR_EXP:
|
||
|
|
if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
|
||
|
|
goto out;
|
||
|
|
llc->busy_state_timer.expire = opt;
|
||
|
|
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;
|
||
|
|
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 (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; break;
|
||
|
|
case LLC_OPT_P_TMR_EXP:
|
||
|
|
val = llc->pf_cycle_timer.expire; break;
|
||
|
|
case LLC_OPT_REJ_TMR_EXP:
|
||
|
|
val = llc->rej_sent_timer.expire; break;
|
||
|
|
case LLC_OPT_BUSY_TMR_EXP:
|
||
|
|
val = llc->busy_state_timer.expire; break;
|
||
|
|
case LLC_OPT_TX_WIN:
|
||
|
|
val = llc->k; break;
|
||
|
|
case LLC_OPT_RX_WIN:
|
||
|
|
val = llc->rw; 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 struct net_proto_family llc_ui_family_ops = {
|
||
|
|
.family = PF_LLC,
|
||
|
|
.create = llc_ui_create,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static 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,
|
||
|
|
};
|
||
|
|
|
||
|
|
extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
|
||
|
|
extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
|
||
|
|
|
||
|
|
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)
|
||
|
|
goto out_unregister_llc_proto;
|
||
|
|
sock_register(&llc_ui_family_ops);
|
||
|
|
llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
|
||
|
|
llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
out_unregister_llc_proto:
|
||
|
|
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();
|
||
|
|
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);
|