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938 lines
22 KiB
938 lines
22 KiB
/*
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* net/dccp/proto.c
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*
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* An implementation of the DCCP protocol
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/config.h>
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#include <linux/dccp.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/if_arp.h>
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#include <linux/init.h>
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#include <linux/random.h>
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#include <net/checksum.h>
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#include <net/inet_common.h>
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#include <net/inet_sock.h>
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#include <net/protocol.h>
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#include <net/sock.h>
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#include <net/xfrm.h>
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#include <asm/semaphore.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/poll.h>
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#include "ccid.h"
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#include "dccp.h"
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DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
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EXPORT_SYMBOL_GPL(dccp_statistics);
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atomic_t dccp_orphan_count = ATOMIC_INIT(0);
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EXPORT_SYMBOL_GPL(dccp_orphan_count);
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static struct net_protocol dccp_protocol = {
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.handler = dccp_v4_rcv,
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.err_handler = dccp_v4_err,
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.no_policy = 1,
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};
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const char *dccp_packet_name(const int type)
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{
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static const char *dccp_packet_names[] = {
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[DCCP_PKT_REQUEST] = "REQUEST",
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[DCCP_PKT_RESPONSE] = "RESPONSE",
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[DCCP_PKT_DATA] = "DATA",
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[DCCP_PKT_ACK] = "ACK",
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[DCCP_PKT_DATAACK] = "DATAACK",
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[DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
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[DCCP_PKT_CLOSE] = "CLOSE",
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[DCCP_PKT_RESET] = "RESET",
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[DCCP_PKT_SYNC] = "SYNC",
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[DCCP_PKT_SYNCACK] = "SYNCACK",
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};
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if (type >= DCCP_NR_PKT_TYPES)
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return "INVALID";
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else
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return dccp_packet_names[type];
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}
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EXPORT_SYMBOL_GPL(dccp_packet_name);
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const char *dccp_state_name(const int state)
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{
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static char *dccp_state_names[] = {
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[DCCP_OPEN] = "OPEN",
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[DCCP_REQUESTING] = "REQUESTING",
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[DCCP_PARTOPEN] = "PARTOPEN",
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[DCCP_LISTEN] = "LISTEN",
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[DCCP_RESPOND] = "RESPOND",
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[DCCP_CLOSING] = "CLOSING",
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[DCCP_TIME_WAIT] = "TIME_WAIT",
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[DCCP_CLOSED] = "CLOSED",
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};
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if (state >= DCCP_MAX_STATES)
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return "INVALID STATE!";
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else
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return dccp_state_names[state];
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}
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EXPORT_SYMBOL_GPL(dccp_state_name);
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static inline int dccp_listen_start(struct sock *sk)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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dp->dccps_role = DCCP_ROLE_LISTEN;
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/*
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* Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE)
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* before calling listen()
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*/
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if (dccp_service_not_initialized(sk))
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return -EPROTO;
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return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE);
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}
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int dccp_disconnect(struct sock *sk, int flags)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct inet_sock *inet = inet_sk(sk);
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int err = 0;
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const int old_state = sk->sk_state;
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if (old_state != DCCP_CLOSED)
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dccp_set_state(sk, DCCP_CLOSED);
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/* ABORT function of RFC793 */
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if (old_state == DCCP_LISTEN) {
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inet_csk_listen_stop(sk);
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/* FIXME: do the active reset thing */
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} else if (old_state == DCCP_REQUESTING)
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sk->sk_err = ECONNRESET;
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dccp_clear_xmit_timers(sk);
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__skb_queue_purge(&sk->sk_receive_queue);
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if (sk->sk_send_head != NULL) {
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__kfree_skb(sk->sk_send_head);
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sk->sk_send_head = NULL;
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}
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inet->dport = 0;
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if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
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inet_reset_saddr(sk);
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sk->sk_shutdown = 0;
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sock_reset_flag(sk, SOCK_DONE);
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icsk->icsk_backoff = 0;
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inet_csk_delack_init(sk);
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__sk_dst_reset(sk);
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BUG_TRAP(!inet->num || icsk->icsk_bind_hash);
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sk->sk_error_report(sk);
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return err;
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}
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EXPORT_SYMBOL_GPL(dccp_disconnect);
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/*
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* Wait for a DCCP event.
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*
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* Note that we don't need to lock the socket, as the upper poll layers
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* take care of normal races (between the test and the event) and we don't
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* go look at any of the socket buffers directly.
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*/
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unsigned int dccp_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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unsigned int mask;
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struct sock *sk = sock->sk;
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poll_wait(file, sk->sk_sleep, wait);
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if (sk->sk_state == DCCP_LISTEN)
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return inet_csk_listen_poll(sk);
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/* Socket is not locked. We are protected from async events
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by poll logic and correct handling of state changes
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made by another threads is impossible in any case.
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*/
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mask = 0;
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if (sk->sk_err)
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mask = POLLERR;
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if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
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mask |= POLLHUP;
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if (sk->sk_shutdown & RCV_SHUTDOWN)
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mask |= POLLIN | POLLRDNORM;
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/* Connected? */
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if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
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if (atomic_read(&sk->sk_rmem_alloc) > 0)
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mask |= POLLIN | POLLRDNORM;
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if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
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if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
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mask |= POLLOUT | POLLWRNORM;
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} else { /* send SIGIO later */
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set_bit(SOCK_ASYNC_NOSPACE,
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&sk->sk_socket->flags);
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set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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/* Race breaker. If space is freed after
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* wspace test but before the flags are set,
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* IO signal will be lost.
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*/
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if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
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mask |= POLLOUT | POLLWRNORM;
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}
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}
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}
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return mask;
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}
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EXPORT_SYMBOL_GPL(dccp_poll);
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int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
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{
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dccp_pr_debug("entry\n");
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return -ENOIOCTLCMD;
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}
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EXPORT_SYMBOL_GPL(dccp_ioctl);
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static int dccp_setsockopt_service(struct sock *sk, const u32 service,
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char __user *optval, int optlen)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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struct dccp_service_list *sl = NULL;
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if (service == DCCP_SERVICE_INVALID_VALUE ||
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optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32))
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return -EINVAL;
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if (optlen > sizeof(service)) {
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sl = kmalloc(optlen, GFP_KERNEL);
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if (sl == NULL)
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return -ENOMEM;
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sl->dccpsl_nr = optlen / sizeof(u32) - 1;
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if (copy_from_user(sl->dccpsl_list,
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optval + sizeof(service),
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optlen - sizeof(service)) ||
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dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
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kfree(sl);
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return -EFAULT;
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}
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}
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lock_sock(sk);
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dp->dccps_service = service;
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kfree(dp->dccps_service_list);
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dp->dccps_service_list = sl;
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release_sock(sk);
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return 0;
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}
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int dccp_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int optlen)
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{
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struct dccp_sock *dp;
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int err;
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int val;
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if (level != SOL_DCCP)
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return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
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optname, optval,
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optlen);
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if (optlen < sizeof(int))
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return -EINVAL;
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if (get_user(val, (int __user *)optval))
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return -EFAULT;
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if (optname == DCCP_SOCKOPT_SERVICE)
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return dccp_setsockopt_service(sk, val, optval, optlen);
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lock_sock(sk);
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dp = dccp_sk(sk);
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err = 0;
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switch (optname) {
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case DCCP_SOCKOPT_PACKET_SIZE:
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dp->dccps_packet_size = val;
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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}
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release_sock(sk);
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return err;
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}
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EXPORT_SYMBOL_GPL(dccp_setsockopt);
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static int dccp_getsockopt_service(struct sock *sk, int len,
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u32 __user *optval,
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int __user *optlen)
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{
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const struct dccp_sock *dp = dccp_sk(sk);
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const struct dccp_service_list *sl;
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int err = -ENOENT, slen = 0, total_len = sizeof(u32);
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lock_sock(sk);
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if (dccp_service_not_initialized(sk))
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goto out;
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if ((sl = dp->dccps_service_list) != NULL) {
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slen = sl->dccpsl_nr * sizeof(u32);
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total_len += slen;
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}
|
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err = -EINVAL;
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if (total_len > len)
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goto out;
|
|
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err = 0;
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if (put_user(total_len, optlen) ||
|
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put_user(dp->dccps_service, optval) ||
|
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(sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen)))
|
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err = -EFAULT;
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out:
|
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release_sock(sk);
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return err;
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}
|
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|
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int dccp_getsockopt(struct sock *sk, int level, int optname,
|
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char __user *optval, int __user *optlen)
|
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{
|
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struct dccp_sock *dp;
|
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int val, len;
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|
|
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if (level != SOL_DCCP)
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return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level,
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optname, optval,
|
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optlen);
|
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if (get_user(len, optlen))
|
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return -EFAULT;
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|
|
|
if (len < sizeof(int))
|
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return -EINVAL;
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|
|
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dp = dccp_sk(sk);
|
|
|
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switch (optname) {
|
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case DCCP_SOCKOPT_PACKET_SIZE:
|
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val = dp->dccps_packet_size;
|
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len = sizeof(dp->dccps_packet_size);
|
|
break;
|
|
case DCCP_SOCKOPT_SERVICE:
|
|
return dccp_getsockopt_service(sk, len,
|
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(u32 __user *)optval, optlen);
|
|
case 128 ... 191:
|
|
return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
|
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len, (u32 __user *)optval, optlen);
|
|
case 192 ... 255:
|
|
return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
|
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len, (u32 __user *)optval, optlen);
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (put_user(len, optlen) || copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_getsockopt);
|
|
|
|
int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
|
|
size_t len)
|
|
{
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
const int flags = msg->msg_flags;
|
|
const int noblock = flags & MSG_DONTWAIT;
|
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struct sk_buff *skb;
|
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int rc, size;
|
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long timeo;
|
|
|
|
if (len > dp->dccps_mss_cache)
|
|
return -EMSGSIZE;
|
|
|
|
lock_sock(sk);
|
|
timeo = sock_sndtimeo(sk, noblock);
|
|
|
|
/*
|
|
* We have to use sk_stream_wait_connect here to set sk_write_pending,
|
|
* so that the trick in dccp_rcv_request_sent_state_process.
|
|
*/
|
|
/* Wait for a connection to finish. */
|
|
if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING))
|
|
if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
|
|
goto out_release;
|
|
|
|
size = sk->sk_prot->max_header + len;
|
|
release_sock(sk);
|
|
skb = sock_alloc_send_skb(sk, size, noblock, &rc);
|
|
lock_sock(sk);
|
|
if (skb == NULL)
|
|
goto out_release;
|
|
|
|
skb_reserve(skb, sk->sk_prot->max_header);
|
|
rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
|
|
if (rc != 0)
|
|
goto out_discard;
|
|
|
|
rc = dccp_write_xmit(sk, skb, &timeo);
|
|
/*
|
|
* XXX we don't use sk_write_queue, so just discard the packet.
|
|
* Current plan however is to _use_ sk_write_queue with
|
|
* an algorith similar to tcp_sendmsg, where the main difference
|
|
* is that in DCCP we have to respect packet boundaries, so
|
|
* no coalescing of skbs.
|
|
*
|
|
* This bug was _quickly_ found & fixed by just looking at an OSTRA
|
|
* generated callgraph 8) -acme
|
|
*/
|
|
out_release:
|
|
release_sock(sk);
|
|
return rc ? : len;
|
|
out_discard:
|
|
kfree_skb(skb);
|
|
goto out_release;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_sendmsg);
|
|
|
|
int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
|
|
size_t len, int nonblock, int flags, int *addr_len)
|
|
{
|
|
const struct dccp_hdr *dh;
|
|
long timeo;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == DCCP_LISTEN) {
|
|
len = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
timeo = sock_rcvtimeo(sk, nonblock);
|
|
|
|
do {
|
|
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
|
|
|
|
if (skb == NULL)
|
|
goto verify_sock_status;
|
|
|
|
dh = dccp_hdr(skb);
|
|
|
|
if (dh->dccph_type == DCCP_PKT_DATA ||
|
|
dh->dccph_type == DCCP_PKT_DATAACK)
|
|
goto found_ok_skb;
|
|
|
|
if (dh->dccph_type == DCCP_PKT_RESET ||
|
|
dh->dccph_type == DCCP_PKT_CLOSE) {
|
|
dccp_pr_debug("found fin ok!\n");
|
|
len = 0;
|
|
goto found_fin_ok;
|
|
}
|
|
dccp_pr_debug("packet_type=%s\n",
|
|
dccp_packet_name(dh->dccph_type));
|
|
sk_eat_skb(sk, skb);
|
|
verify_sock_status:
|
|
if (sock_flag(sk, SOCK_DONE)) {
|
|
len = 0;
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_err) {
|
|
len = sock_error(sk);
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN) {
|
|
len = 0;
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_state == DCCP_CLOSED) {
|
|
if (!sock_flag(sk, SOCK_DONE)) {
|
|
/* This occurs when user tries to read
|
|
* from never connected socket.
|
|
*/
|
|
len = -ENOTCONN;
|
|
break;
|
|
}
|
|
len = 0;
|
|
break;
|
|
}
|
|
|
|
if (!timeo) {
|
|
len = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
|
len = sock_intr_errno(timeo);
|
|
break;
|
|
}
|
|
|
|
sk_wait_data(sk, &timeo);
|
|
continue;
|
|
found_ok_skb:
|
|
if (len > skb->len)
|
|
len = skb->len;
|
|
else if (len < skb->len)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
|
|
if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) {
|
|
/* Exception. Bailout! */
|
|
len = -EFAULT;
|
|
break;
|
|
}
|
|
found_fin_ok:
|
|
if (!(flags & MSG_PEEK))
|
|
sk_eat_skb(sk, skb);
|
|
break;
|
|
} while (1);
|
|
out:
|
|
release_sock(sk);
|
|
return len;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_recvmsg);
|
|
|
|
int inet_dccp_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
unsigned char old_state;
|
|
int err;
|
|
|
|
lock_sock(sk);
|
|
|
|
err = -EINVAL;
|
|
if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP)
|
|
goto out;
|
|
|
|
old_state = sk->sk_state;
|
|
if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN)))
|
|
goto out;
|
|
|
|
/* Really, if the socket is already in listen state
|
|
* we can only allow the backlog to be adjusted.
|
|
*/
|
|
if (old_state != DCCP_LISTEN) {
|
|
/*
|
|
* FIXME: here it probably should be sk->sk_prot->listen_start
|
|
* see tcp_listen_start
|
|
*/
|
|
err = dccp_listen_start(sk);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
sk->sk_max_ack_backlog = backlog;
|
|
err = 0;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inet_dccp_listen);
|
|
|
|
static const unsigned char dccp_new_state[] = {
|
|
/* current state: new state: action: */
|
|
[0] = DCCP_CLOSED,
|
|
[DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN,
|
|
[DCCP_REQUESTING] = DCCP_CLOSED,
|
|
[DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN,
|
|
[DCCP_LISTEN] = DCCP_CLOSED,
|
|
[DCCP_RESPOND] = DCCP_CLOSED,
|
|
[DCCP_CLOSING] = DCCP_CLOSED,
|
|
[DCCP_TIME_WAIT] = DCCP_CLOSED,
|
|
[DCCP_CLOSED] = DCCP_CLOSED,
|
|
};
|
|
|
|
static int dccp_close_state(struct sock *sk)
|
|
{
|
|
const int next = dccp_new_state[sk->sk_state];
|
|
const int ns = next & DCCP_STATE_MASK;
|
|
|
|
if (ns != sk->sk_state)
|
|
dccp_set_state(sk, ns);
|
|
|
|
return next & DCCP_ACTION_FIN;
|
|
}
|
|
|
|
void dccp_close(struct sock *sk, long timeout)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
lock_sock(sk);
|
|
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
|
|
if (sk->sk_state == DCCP_LISTEN) {
|
|
dccp_set_state(sk, DCCP_CLOSED);
|
|
|
|
/* Special case. */
|
|
inet_csk_listen_stop(sk);
|
|
|
|
goto adjudge_to_death;
|
|
}
|
|
|
|
/*
|
|
* We need to flush the recv. buffs. We do this only on the
|
|
* descriptor close, not protocol-sourced closes, because the
|
|
*reader process may not have drained the data yet!
|
|
*/
|
|
/* FIXME: check for unread data */
|
|
while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
|
|
__kfree_skb(skb);
|
|
}
|
|
|
|
if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
|
|
/* Check zero linger _after_ checking for unread data. */
|
|
sk->sk_prot->disconnect(sk, 0);
|
|
} else if (dccp_close_state(sk)) {
|
|
dccp_send_close(sk, 1);
|
|
}
|
|
|
|
sk_stream_wait_close(sk, timeout);
|
|
|
|
adjudge_to_death:
|
|
/*
|
|
* It is the last release_sock in its life. It will remove backlog.
|
|
*/
|
|
release_sock(sk);
|
|
/*
|
|
* Now socket is owned by kernel and we acquire BH lock
|
|
* to finish close. No need to check for user refs.
|
|
*/
|
|
local_bh_disable();
|
|
bh_lock_sock(sk);
|
|
BUG_TRAP(!sock_owned_by_user(sk));
|
|
|
|
sock_hold(sk);
|
|
sock_orphan(sk);
|
|
|
|
/*
|
|
* The last release_sock may have processed the CLOSE or RESET
|
|
* packet moving sock to CLOSED state, if not we have to fire
|
|
* the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination"
|
|
* in draft-ietf-dccp-spec-11. -acme
|
|
*/
|
|
if (sk->sk_state == DCCP_CLOSING) {
|
|
/* FIXME: should start at 2 * RTT */
|
|
/* Timer for repeating the CLOSE/CLOSEREQ until an answer. */
|
|
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
|
|
inet_csk(sk)->icsk_rto,
|
|
DCCP_RTO_MAX);
|
|
#if 0
|
|
/* Yeah, we should use sk->sk_prot->orphan_count, etc */
|
|
dccp_set_state(sk, DCCP_CLOSED);
|
|
#endif
|
|
}
|
|
|
|
atomic_inc(sk->sk_prot->orphan_count);
|
|
if (sk->sk_state == DCCP_CLOSED)
|
|
inet_csk_destroy_sock(sk);
|
|
|
|
/* Otherwise, socket is reprieved until protocol close. */
|
|
|
|
bh_unlock_sock(sk);
|
|
local_bh_enable();
|
|
sock_put(sk);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_close);
|
|
|
|
void dccp_shutdown(struct sock *sk, int how)
|
|
{
|
|
dccp_pr_debug("entry\n");
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_shutdown);
|
|
|
|
static const struct proto_ops inet_dccp_ops = {
|
|
.family = PF_INET,
|
|
.owner = THIS_MODULE,
|
|
.release = inet_release,
|
|
.bind = inet_bind,
|
|
.connect = inet_stream_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = inet_accept,
|
|
.getname = inet_getname,
|
|
/* FIXME: work on tcp_poll to rename it to inet_csk_poll */
|
|
.poll = dccp_poll,
|
|
.ioctl = inet_ioctl,
|
|
/* FIXME: work on inet_listen to rename it to sock_common_listen */
|
|
.listen = inet_dccp_listen,
|
|
.shutdown = inet_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = sock_common_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
extern struct net_proto_family inet_family_ops;
|
|
|
|
static struct inet_protosw dccp_v4_protosw = {
|
|
.type = SOCK_DCCP,
|
|
.protocol = IPPROTO_DCCP,
|
|
.prot = &dccp_prot,
|
|
.ops = &inet_dccp_ops,
|
|
.capability = -1,
|
|
.no_check = 0,
|
|
.flags = INET_PROTOSW_ICSK,
|
|
};
|
|
|
|
/*
|
|
* This is the global socket data structure used for responding to
|
|
* the Out-of-the-blue (OOTB) packets. A control sock will be created
|
|
* for this socket at the initialization time.
|
|
*/
|
|
struct socket *dccp_ctl_socket;
|
|
|
|
static char dccp_ctl_socket_err_msg[] __initdata =
|
|
KERN_ERR "DCCP: Failed to create the control socket.\n";
|
|
|
|
static int __init dccp_ctl_sock_init(void)
|
|
{
|
|
int rc = sock_create_kern(PF_INET, SOCK_DCCP, IPPROTO_DCCP,
|
|
&dccp_ctl_socket);
|
|
if (rc < 0)
|
|
printk(dccp_ctl_socket_err_msg);
|
|
else {
|
|
dccp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
|
|
inet_sk(dccp_ctl_socket->sk)->uc_ttl = -1;
|
|
|
|
/* Unhash it so that IP input processing does not even
|
|
* see it, we do not wish this socket to see incoming
|
|
* packets.
|
|
*/
|
|
dccp_ctl_socket->sk->sk_prot->unhash(dccp_ctl_socket->sk);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_DCCP_UNLOAD_HACK
|
|
void dccp_ctl_sock_exit(void)
|
|
{
|
|
if (dccp_ctl_socket != NULL) {
|
|
sock_release(dccp_ctl_socket);
|
|
dccp_ctl_socket = NULL;
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_ctl_sock_exit);
|
|
#endif
|
|
|
|
static int __init init_dccp_v4_mibs(void)
|
|
{
|
|
int rc = -ENOMEM;
|
|
|
|
dccp_statistics[0] = alloc_percpu(struct dccp_mib);
|
|
if (dccp_statistics[0] == NULL)
|
|
goto out;
|
|
|
|
dccp_statistics[1] = alloc_percpu(struct dccp_mib);
|
|
if (dccp_statistics[1] == NULL)
|
|
goto out_free_one;
|
|
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
out_free_one:
|
|
free_percpu(dccp_statistics[0]);
|
|
dccp_statistics[0] = NULL;
|
|
goto out;
|
|
|
|
}
|
|
|
|
static int thash_entries;
|
|
module_param(thash_entries, int, 0444);
|
|
MODULE_PARM_DESC(thash_entries, "Number of ehash buckets");
|
|
|
|
#ifdef CONFIG_IP_DCCP_DEBUG
|
|
int dccp_debug;
|
|
module_param(dccp_debug, int, 0444);
|
|
MODULE_PARM_DESC(dccp_debug, "Enable debug messages");
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_debug);
|
|
#endif
|
|
|
|
static int __init dccp_init(void)
|
|
{
|
|
unsigned long goal;
|
|
int ehash_order, bhash_order, i;
|
|
int rc = proto_register(&dccp_prot, 1);
|
|
|
|
if (rc)
|
|
goto out;
|
|
|
|
dccp_hashinfo.bind_bucket_cachep =
|
|
kmem_cache_create("dccp_bind_bucket",
|
|
sizeof(struct inet_bind_bucket), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL, NULL);
|
|
if (!dccp_hashinfo.bind_bucket_cachep)
|
|
goto out_proto_unregister;
|
|
|
|
/*
|
|
* Size and allocate the main established and bind bucket
|
|
* hash tables.
|
|
*
|
|
* The methodology is similar to that of the buffer cache.
|
|
*/
|
|
if (num_physpages >= (128 * 1024))
|
|
goal = num_physpages >> (21 - PAGE_SHIFT);
|
|
else
|
|
goal = num_physpages >> (23 - PAGE_SHIFT);
|
|
|
|
if (thash_entries)
|
|
goal = (thash_entries *
|
|
sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT;
|
|
for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
|
|
;
|
|
do {
|
|
dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE /
|
|
sizeof(struct inet_ehash_bucket);
|
|
dccp_hashinfo.ehash_size >>= 1;
|
|
while (dccp_hashinfo.ehash_size &
|
|
(dccp_hashinfo.ehash_size - 1))
|
|
dccp_hashinfo.ehash_size--;
|
|
dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
|
|
__get_free_pages(GFP_ATOMIC, ehash_order);
|
|
} while (!dccp_hashinfo.ehash && --ehash_order > 0);
|
|
|
|
if (!dccp_hashinfo.ehash) {
|
|
printk(KERN_CRIT "Failed to allocate DCCP "
|
|
"established hash table\n");
|
|
goto out_free_bind_bucket_cachep;
|
|
}
|
|
|
|
for (i = 0; i < (dccp_hashinfo.ehash_size << 1); i++) {
|
|
rwlock_init(&dccp_hashinfo.ehash[i].lock);
|
|
INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain);
|
|
}
|
|
|
|
bhash_order = ehash_order;
|
|
|
|
do {
|
|
dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE /
|
|
sizeof(struct inet_bind_hashbucket);
|
|
if ((dccp_hashinfo.bhash_size > (64 * 1024)) &&
|
|
bhash_order > 0)
|
|
continue;
|
|
dccp_hashinfo.bhash = (struct inet_bind_hashbucket *)
|
|
__get_free_pages(GFP_ATOMIC, bhash_order);
|
|
} while (!dccp_hashinfo.bhash && --bhash_order >= 0);
|
|
|
|
if (!dccp_hashinfo.bhash) {
|
|
printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n");
|
|
goto out_free_dccp_ehash;
|
|
}
|
|
|
|
for (i = 0; i < dccp_hashinfo.bhash_size; i++) {
|
|
spin_lock_init(&dccp_hashinfo.bhash[i].lock);
|
|
INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
|
|
}
|
|
|
|
if (init_dccp_v4_mibs())
|
|
goto out_free_dccp_bhash;
|
|
|
|
rc = -EAGAIN;
|
|
if (inet_add_protocol(&dccp_protocol, IPPROTO_DCCP))
|
|
goto out_free_dccp_v4_mibs;
|
|
|
|
inet_register_protosw(&dccp_v4_protosw);
|
|
|
|
rc = dccp_ctl_sock_init();
|
|
if (rc)
|
|
goto out_unregister_protosw;
|
|
out:
|
|
return rc;
|
|
out_unregister_protosw:
|
|
inet_unregister_protosw(&dccp_v4_protosw);
|
|
inet_del_protocol(&dccp_protocol, IPPROTO_DCCP);
|
|
out_free_dccp_v4_mibs:
|
|
free_percpu(dccp_statistics[0]);
|
|
free_percpu(dccp_statistics[1]);
|
|
dccp_statistics[0] = dccp_statistics[1] = NULL;
|
|
out_free_dccp_bhash:
|
|
free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order);
|
|
dccp_hashinfo.bhash = NULL;
|
|
out_free_dccp_ehash:
|
|
free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order);
|
|
dccp_hashinfo.ehash = NULL;
|
|
out_free_bind_bucket_cachep:
|
|
kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
|
|
dccp_hashinfo.bind_bucket_cachep = NULL;
|
|
out_proto_unregister:
|
|
proto_unregister(&dccp_prot);
|
|
goto out;
|
|
}
|
|
|
|
static const char dccp_del_proto_err_msg[] __exitdata =
|
|
KERN_ERR "can't remove dccp net_protocol\n";
|
|
|
|
static void __exit dccp_fini(void)
|
|
{
|
|
inet_unregister_protosw(&dccp_v4_protosw);
|
|
|
|
if (inet_del_protocol(&dccp_protocol, IPPROTO_DCCP) < 0)
|
|
printk(dccp_del_proto_err_msg);
|
|
|
|
free_percpu(dccp_statistics[0]);
|
|
free_percpu(dccp_statistics[1]);
|
|
free_pages((unsigned long)dccp_hashinfo.bhash,
|
|
get_order(dccp_hashinfo.bhash_size *
|
|
sizeof(struct inet_bind_hashbucket)));
|
|
free_pages((unsigned long)dccp_hashinfo.ehash,
|
|
get_order(dccp_hashinfo.ehash_size *
|
|
sizeof(struct inet_ehash_bucket)));
|
|
kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
|
|
proto_unregister(&dccp_prot);
|
|
}
|
|
|
|
module_init(dccp_init);
|
|
module_exit(dccp_fini);
|
|
|
|
/*
|
|
* __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
|
|
* values directly, Also cover the case where the protocol is not specified,
|
|
* i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP
|
|
*/
|
|
MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6");
|
|
MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>");
|
|
MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol");
|
|
|