2005-04-16 16:20:36 -06:00
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/* transport.c: Rx Transport routines
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <rxrpc/transport.h>
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#include <rxrpc/peer.h>
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#include <rxrpc/connection.h>
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#include <rxrpc/call.h>
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#include <rxrpc/message.h>
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#include <rxrpc/krxiod.h>
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#include <rxrpc/krxsecd.h>
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#include <linux/udp.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/icmp.h>
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2005-11-10 14:01:24 -07:00
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#include <linux/skbuff.h>
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2005-04-16 16:20:36 -06:00
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#include <net/sock.h>
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#include <net/ip.h>
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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#include <linux/ipv6.h> /* this should _really_ be in errqueue.h.. */
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#endif
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#include <linux/errqueue.h>
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#include <asm/uaccess.h>
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#include <asm/checksum.h>
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#include "internal.h"
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struct errormsg {
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struct cmsghdr cmsg; /* control message header */
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struct sock_extended_err ee; /* extended error information */
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struct sockaddr_in icmp_src; /* ICMP packet source address */
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};
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static DEFINE_SPINLOCK(rxrpc_transports_lock);
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static struct list_head rxrpc_transports = LIST_HEAD_INIT(rxrpc_transports);
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__RXACCT_DECL(atomic_t rxrpc_transport_count);
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LIST_HEAD(rxrpc_proc_transports);
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DECLARE_RWSEM(rxrpc_proc_transports_sem);
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static void rxrpc_data_ready(struct sock *sk, int count);
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static void rxrpc_error_report(struct sock *sk);
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static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
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struct list_head *msgq);
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static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans);
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/*****************************************************************************/
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/*
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* create a new transport endpoint using the specified UDP port
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*/
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int rxrpc_create_transport(unsigned short port,
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struct rxrpc_transport **_trans)
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{
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struct rxrpc_transport *trans;
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struct sockaddr_in sin;
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mm_segment_t oldfs;
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struct sock *sock;
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int ret, opt;
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_enter("%hu", port);
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2006-07-21 15:51:30 -06:00
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trans = kzalloc(sizeof(struct rxrpc_transport), GFP_KERNEL);
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2005-04-16 16:20:36 -06:00
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if (!trans)
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return -ENOMEM;
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atomic_set(&trans->usage, 1);
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INIT_LIST_HEAD(&trans->services);
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INIT_LIST_HEAD(&trans->link);
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INIT_LIST_HEAD(&trans->krxiodq_link);
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spin_lock_init(&trans->lock);
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INIT_LIST_HEAD(&trans->peer_active);
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INIT_LIST_HEAD(&trans->peer_graveyard);
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spin_lock_init(&trans->peer_gylock);
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init_waitqueue_head(&trans->peer_gy_waitq);
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rwlock_init(&trans->peer_lock);
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atomic_set(&trans->peer_count, 0);
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trans->port = port;
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/* create a UDP socket to be my actual transport endpoint */
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ret = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &trans->socket);
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if (ret < 0)
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goto error;
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/* use the specified port */
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if (port) {
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_port = htons(port);
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ret = trans->socket->ops->bind(trans->socket,
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(struct sockaddr *) &sin,
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sizeof(sin));
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if (ret < 0)
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goto error;
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}
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opt = 1;
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oldfs = get_fs();
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set_fs(KERNEL_DS);
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ret = trans->socket->ops->setsockopt(trans->socket, SOL_IP, IP_RECVERR,
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(char *) &opt, sizeof(opt));
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set_fs(oldfs);
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spin_lock(&rxrpc_transports_lock);
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list_add(&trans->link, &rxrpc_transports);
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spin_unlock(&rxrpc_transports_lock);
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/* set the socket up */
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sock = trans->socket->sk;
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sock->sk_user_data = trans;
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sock->sk_data_ready = rxrpc_data_ready;
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sock->sk_error_report = rxrpc_error_report;
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down_write(&rxrpc_proc_transports_sem);
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list_add_tail(&trans->proc_link, &rxrpc_proc_transports);
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up_write(&rxrpc_proc_transports_sem);
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__RXACCT(atomic_inc(&rxrpc_transport_count));
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*_trans = trans;
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_leave(" = 0 (%p)", trans);
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return 0;
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error:
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/* finish cleaning up the transport (not really needed here, but...) */
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if (trans->socket)
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trans->socket->ops->shutdown(trans->socket, 2);
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/* close the socket */
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if (trans->socket) {
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trans->socket->sk->sk_user_data = NULL;
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sock_release(trans->socket);
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trans->socket = NULL;
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}
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kfree(trans);
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_leave(" = %d", ret);
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return ret;
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} /* end rxrpc_create_transport() */
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/*****************************************************************************/
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/*
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* destroy a transport endpoint
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*/
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void rxrpc_put_transport(struct rxrpc_transport *trans)
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{
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_enter("%p{u=%d p=%hu}",
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trans, atomic_read(&trans->usage), trans->port);
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BUG_ON(atomic_read(&trans->usage) <= 0);
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/* to prevent a race, the decrement and the dequeue must be
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* effectively atomic */
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spin_lock(&rxrpc_transports_lock);
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if (likely(!atomic_dec_and_test(&trans->usage))) {
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spin_unlock(&rxrpc_transports_lock);
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_leave("");
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return;
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}
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list_del(&trans->link);
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spin_unlock(&rxrpc_transports_lock);
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/* finish cleaning up the transport */
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if (trans->socket)
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trans->socket->ops->shutdown(trans->socket, 2);
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rxrpc_krxsecd_clear_transport(trans);
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rxrpc_krxiod_dequeue_transport(trans);
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/* discard all peer information */
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rxrpc_peer_clearall(trans);
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down_write(&rxrpc_proc_transports_sem);
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list_del(&trans->proc_link);
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up_write(&rxrpc_proc_transports_sem);
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__RXACCT(atomic_dec(&rxrpc_transport_count));
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/* close the socket */
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if (trans->socket) {
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trans->socket->sk->sk_user_data = NULL;
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sock_release(trans->socket);
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trans->socket = NULL;
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}
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kfree(trans);
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_leave("");
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} /* end rxrpc_put_transport() */
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/*****************************************************************************/
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/*
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* add a service to a transport to be listened upon
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*/
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int rxrpc_add_service(struct rxrpc_transport *trans,
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struct rxrpc_service *newsrv)
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{
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struct rxrpc_service *srv;
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struct list_head *_p;
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int ret = -EEXIST;
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_enter("%p{%hu},%p{%hu}",
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trans, trans->port, newsrv, newsrv->service_id);
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/* verify that the service ID is not already present */
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spin_lock(&trans->lock);
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list_for_each(_p, &trans->services) {
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srv = list_entry(_p, struct rxrpc_service, link);
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if (srv->service_id == newsrv->service_id)
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goto out;
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}
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/* okay - add the transport to the list */
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list_add_tail(&newsrv->link, &trans->services);
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rxrpc_get_transport(trans);
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ret = 0;
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out:
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spin_unlock(&trans->lock);
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_leave("= %d", ret);
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return ret;
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} /* end rxrpc_add_service() */
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/*****************************************************************************/
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/*
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* remove a service from a transport
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*/
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void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv)
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{
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_enter("%p{%hu},%p{%hu}", trans, trans->port, srv, srv->service_id);
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spin_lock(&trans->lock);
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list_del(&srv->link);
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spin_unlock(&trans->lock);
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rxrpc_put_transport(trans);
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_leave("");
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} /* end rxrpc_del_service() */
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/*****************************************************************************/
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/*
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* INET callback when data has been received on the socket.
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*/
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static void rxrpc_data_ready(struct sock *sk, int count)
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{
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struct rxrpc_transport *trans;
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_enter("%p{t=%p},%d", sk, sk->sk_user_data, count);
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/* queue the transport for attention by krxiod */
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trans = (struct rxrpc_transport *) sk->sk_user_data;
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if (trans)
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rxrpc_krxiod_queue_transport(trans);
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/* wake up anyone waiting on the socket */
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if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
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wake_up_interruptible(sk->sk_sleep);
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_leave("");
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} /* end rxrpc_data_ready() */
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/*****************************************************************************/
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/*
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* INET callback when an ICMP error packet is received
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* - sk->err is error (EHOSTUNREACH, EPROTO or EMSGSIZE)
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*/
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static void rxrpc_error_report(struct sock *sk)
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{
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struct rxrpc_transport *trans;
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_enter("%p{t=%p}", sk, sk->sk_user_data);
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/* queue the transport for attention by krxiod */
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trans = (struct rxrpc_transport *) sk->sk_user_data;
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if (trans) {
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trans->error_rcvd = 1;
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rxrpc_krxiod_queue_transport(trans);
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}
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/* wake up anyone waiting on the socket */
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if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
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wake_up_interruptible(sk->sk_sleep);
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_leave("");
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} /* end rxrpc_error_report() */
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/*****************************************************************************/
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/*
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* split a message up, allocating message records and filling them in
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* from the contents of a socket buffer
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*/
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static int rxrpc_incoming_msg(struct rxrpc_transport *trans,
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struct sk_buff *pkt,
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struct list_head *msgq)
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{
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struct rxrpc_message *msg;
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int ret;
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_enter("");
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2006-07-21 15:51:30 -06:00
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msg = kzalloc(sizeof(struct rxrpc_message), GFP_KERNEL);
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2005-04-16 16:20:36 -06:00
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if (!msg) {
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_leave(" = -ENOMEM");
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return -ENOMEM;
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}
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atomic_set(&msg->usage, 1);
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list_add_tail(&msg->link,msgq);
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/* dig out the Rx routing parameters */
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if (skb_copy_bits(pkt, sizeof(struct udphdr),
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&msg->hdr, sizeof(msg->hdr)) < 0) {
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ret = -EBADMSG;
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goto error;
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}
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msg->trans = trans;
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msg->state = RXRPC_MSG_RECEIVED;
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2005-08-15 22:13:25 -06:00
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skb_get_timestamp(pkt, &msg->stamp);
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2005-04-16 16:20:36 -06:00
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if (msg->stamp.tv_sec == 0) {
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do_gettimeofday(&msg->stamp);
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if (pkt->sk)
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sock_enable_timestamp(pkt->sk);
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}
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msg->seq = ntohl(msg->hdr.seq);
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/* attach the packet */
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skb_get(pkt);
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msg->pkt = pkt;
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msg->offset = sizeof(struct udphdr) + sizeof(struct rxrpc_header);
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msg->dsize = msg->pkt->len - msg->offset;
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_net("Rx Received packet from %s (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
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msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
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ntohl(msg->hdr.epoch),
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(ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
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ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
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ntohl(msg->hdr.callNumber),
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rxrpc_pkts[msg->hdr.type],
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msg->hdr.flags,
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ntohs(msg->hdr.serviceId),
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msg->hdr.securityIndex);
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__RXACCT(atomic_inc(&rxrpc_message_count));
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/* split off jumbo packets */
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while (msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
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msg->hdr.flags & RXRPC_JUMBO_PACKET
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) {
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struct rxrpc_jumbo_header jumbo;
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struct rxrpc_message *jumbomsg = msg;
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_debug("split jumbo packet");
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/* quick sanity check */
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ret = -EBADMSG;
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if (msg->dsize <
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|
RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
|
|
|
|
goto error;
|
|
|
|
if (msg->hdr.flags & RXRPC_LAST_PACKET)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
/* dig out the secondary header */
|
|
|
|
if (skb_copy_bits(pkt, msg->offset + RXRPC_JUMBO_DATALEN,
|
|
|
|
&jumbo, sizeof(jumbo)) < 0)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
/* allocate a new message record */
|
|
|
|
ret = -ENOMEM;
|
2006-10-01 00:27:21 -06:00
|
|
|
msg = kmemdup(jumbomsg, sizeof(struct rxrpc_message), GFP_KERNEL);
|
2005-04-16 16:20:36 -06:00
|
|
|
if (!msg)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
list_add_tail(&msg->link, msgq);
|
|
|
|
|
|
|
|
/* adjust the jumbo packet */
|
|
|
|
jumbomsg->dsize = RXRPC_JUMBO_DATALEN;
|
|
|
|
|
|
|
|
/* attach the packet here too */
|
|
|
|
skb_get(pkt);
|
|
|
|
|
|
|
|
/* adjust the parameters */
|
|
|
|
msg->seq++;
|
|
|
|
msg->hdr.seq = htonl(msg->seq);
|
|
|
|
msg->hdr.serial = htonl(ntohl(msg->hdr.serial) + 1);
|
|
|
|
msg->offset += RXRPC_JUMBO_DATALEN +
|
|
|
|
sizeof(struct rxrpc_jumbo_header);
|
|
|
|
msg->dsize -= RXRPC_JUMBO_DATALEN +
|
|
|
|
sizeof(struct rxrpc_jumbo_header);
|
|
|
|
msg->hdr.flags = jumbo.flags;
|
|
|
|
msg->hdr._rsvd = jumbo._rsvd;
|
|
|
|
|
|
|
|
_net("Rx Split jumbo packet from %s"
|
|
|
|
" (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
|
|
|
|
msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
|
|
|
|
ntohl(msg->hdr.epoch),
|
|
|
|
(ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
|
|
|
|
ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
|
|
|
|
ntohl(msg->hdr.callNumber),
|
|
|
|
rxrpc_pkts[msg->hdr.type],
|
|
|
|
msg->hdr.flags,
|
|
|
|
ntohs(msg->hdr.serviceId),
|
|
|
|
msg->hdr.securityIndex);
|
|
|
|
|
|
|
|
__RXACCT(atomic_inc(&rxrpc_message_count));
|
|
|
|
}
|
|
|
|
|
|
|
|
_leave(" = 0 #%d", atomic_read(&rxrpc_message_count));
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error:
|
|
|
|
while (!list_empty(msgq)) {
|
|
|
|
msg = list_entry(msgq->next, struct rxrpc_message, link);
|
|
|
|
list_del_init(&msg->link);
|
|
|
|
|
|
|
|
rxrpc_put_message(msg);
|
|
|
|
}
|
|
|
|
|
|
|
|
_leave(" = %d", ret);
|
|
|
|
return ret;
|
|
|
|
} /* end rxrpc_incoming_msg() */
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
/*
|
|
|
|
* accept a new call
|
|
|
|
* - called from krxiod in process context
|
|
|
|
*/
|
|
|
|
void rxrpc_trans_receive_packet(struct rxrpc_transport *trans)
|
|
|
|
{
|
|
|
|
struct rxrpc_message *msg;
|
|
|
|
struct rxrpc_peer *peer;
|
|
|
|
struct sk_buff *pkt;
|
|
|
|
int ret;
|
|
|
|
__be32 addr;
|
|
|
|
__be16 port;
|
|
|
|
|
|
|
|
LIST_HEAD(msgq);
|
|
|
|
|
|
|
|
_enter("%p{%d}", trans, trans->port);
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
/* deal with outstanting errors first */
|
|
|
|
if (trans->error_rcvd)
|
|
|
|
rxrpc_trans_receive_error_report(trans);
|
|
|
|
|
|
|
|
/* attempt to receive a packet */
|
|
|
|
pkt = skb_recv_datagram(trans->socket->sk, 0, 1, &ret);
|
|
|
|
if (!pkt) {
|
|
|
|
if (ret == -EAGAIN) {
|
|
|
|
_leave(" EAGAIN");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* an icmp error may have occurred */
|
|
|
|
rxrpc_krxiod_queue_transport(trans);
|
|
|
|
_leave(" error %d\n", ret);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* we'll probably need to checksum it (didn't call
|
|
|
|
* sock_recvmsg) */
|
2005-11-10 14:01:24 -07:00
|
|
|
if (skb_checksum_complete(pkt)) {
|
|
|
|
kfree_skb(pkt);
|
|
|
|
rxrpc_krxiod_queue_transport(trans);
|
|
|
|
_leave(" CSUM failed");
|
|
|
|
return;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
addr = pkt->nh.iph->saddr;
|
|
|
|
port = pkt->h.uh->source;
|
|
|
|
|
|
|
|
_net("Rx Received UDP packet from %08x:%04hu",
|
|
|
|
ntohl(addr), ntohs(port));
|
|
|
|
|
|
|
|
/* unmarshall the Rx parameters and split jumbo packets */
|
|
|
|
ret = rxrpc_incoming_msg(trans, pkt, &msgq);
|
|
|
|
if (ret < 0) {
|
|
|
|
kfree_skb(pkt);
|
|
|
|
rxrpc_krxiod_queue_transport(trans);
|
|
|
|
_leave(" bad packet");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
BUG_ON(list_empty(&msgq));
|
|
|
|
|
|
|
|
msg = list_entry(msgq.next, struct rxrpc_message, link);
|
|
|
|
|
|
|
|
/* locate the record for the peer from which it
|
|
|
|
* originated */
|
|
|
|
ret = rxrpc_peer_lookup(trans, addr, &peer);
|
|
|
|
if (ret < 0) {
|
|
|
|
kdebug("Rx No connections from that peer");
|
|
|
|
rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
|
|
|
|
goto finished_msg;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* try and find a matching connection */
|
|
|
|
ret = rxrpc_connection_lookup(peer, msg, &msg->conn);
|
|
|
|
if (ret < 0) {
|
|
|
|
kdebug("Rx Unknown Connection");
|
|
|
|
rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
|
|
|
|
rxrpc_put_peer(peer);
|
|
|
|
goto finished_msg;
|
|
|
|
}
|
|
|
|
rxrpc_put_peer(peer);
|
|
|
|
|
|
|
|
/* deal with the first packet of a new call */
|
|
|
|
if (msg->hdr.flags & RXRPC_CLIENT_INITIATED &&
|
|
|
|
msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
|
|
|
|
ntohl(msg->hdr.seq) == 1
|
|
|
|
) {
|
|
|
|
_debug("Rx New server call");
|
|
|
|
rxrpc_trans_receive_new_call(trans, &msgq);
|
|
|
|
goto finished_msg;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* deal with subsequent packet(s) of call */
|
|
|
|
_debug("Rx Call packet");
|
|
|
|
while (!list_empty(&msgq)) {
|
|
|
|
msg = list_entry(msgq.next, struct rxrpc_message, link);
|
|
|
|
list_del_init(&msg->link);
|
|
|
|
|
|
|
|
ret = rxrpc_conn_receive_call_packet(msg->conn, NULL, msg);
|
|
|
|
if (ret < 0) {
|
|
|
|
rxrpc_trans_immediate_abort(trans, msg, ret);
|
|
|
|
rxrpc_put_message(msg);
|
|
|
|
goto finished_msg;
|
|
|
|
}
|
|
|
|
|
|
|
|
rxrpc_put_message(msg);
|
|
|
|
}
|
|
|
|
|
|
|
|
goto finished_msg;
|
|
|
|
|
|
|
|
/* dispose of the packets */
|
|
|
|
finished_msg:
|
|
|
|
while (!list_empty(&msgq)) {
|
|
|
|
msg = list_entry(msgq.next, struct rxrpc_message, link);
|
|
|
|
list_del_init(&msg->link);
|
|
|
|
|
|
|
|
rxrpc_put_message(msg);
|
|
|
|
}
|
|
|
|
kfree_skb(pkt);
|
|
|
|
}
|
|
|
|
|
|
|
|
_leave("");
|
|
|
|
|
|
|
|
} /* end rxrpc_trans_receive_packet() */
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
/*
|
|
|
|
* accept a new call from a client trying to connect to one of my services
|
|
|
|
* - called in process context
|
|
|
|
*/
|
|
|
|
static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
|
|
|
|
struct list_head *msgq)
|
|
|
|
{
|
|
|
|
struct rxrpc_message *msg;
|
|
|
|
|
|
|
|
_enter("");
|
|
|
|
|
|
|
|
/* only bother with the first packet */
|
|
|
|
msg = list_entry(msgq->next, struct rxrpc_message, link);
|
|
|
|
list_del_init(&msg->link);
|
|
|
|
rxrpc_krxsecd_queue_incoming_call(msg);
|
|
|
|
rxrpc_put_message(msg);
|
|
|
|
|
|
|
|
_leave(" = 0");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
} /* end rxrpc_trans_receive_new_call() */
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
/*
|
|
|
|
* perform an immediate abort without connection or call structures
|
|
|
|
*/
|
|
|
|
int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans,
|
|
|
|
struct rxrpc_message *msg,
|
|
|
|
int error)
|
|
|
|
{
|
|
|
|
struct rxrpc_header ahdr;
|
|
|
|
struct sockaddr_in sin;
|
|
|
|
struct msghdr msghdr;
|
|
|
|
struct kvec iov[2];
|
|
|
|
__be32 _error;
|
|
|
|
int len, ret;
|
|
|
|
|
|
|
|
_enter("%p,%p,%d", trans, msg, error);
|
|
|
|
|
|
|
|
/* don't abort an abort packet */
|
|
|
|
if (msg->hdr.type == RXRPC_PACKET_TYPE_ABORT) {
|
|
|
|
_leave(" = 0");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
_error = htonl(-error);
|
|
|
|
|
|
|
|
/* set up the message to be transmitted */
|
|
|
|
memcpy(&ahdr, &msg->hdr, sizeof(ahdr));
|
|
|
|
ahdr.epoch = msg->hdr.epoch;
|
|
|
|
ahdr.serial = htonl(1);
|
|
|
|
ahdr.seq = 0;
|
|
|
|
ahdr.type = RXRPC_PACKET_TYPE_ABORT;
|
|
|
|
ahdr.flags = RXRPC_LAST_PACKET;
|
|
|
|
ahdr.flags |= ~msg->hdr.flags & RXRPC_CLIENT_INITIATED;
|
|
|
|
|
|
|
|
iov[0].iov_len = sizeof(ahdr);
|
|
|
|
iov[0].iov_base = &ahdr;
|
|
|
|
iov[1].iov_len = sizeof(_error);
|
|
|
|
iov[1].iov_base = &_error;
|
|
|
|
|
|
|
|
len = sizeof(ahdr) + sizeof(_error);
|
|
|
|
|
|
|
|
memset(&sin,0,sizeof(sin));
|
|
|
|
sin.sin_family = AF_INET;
|
|
|
|
sin.sin_port = msg->pkt->h.uh->source;
|
|
|
|
sin.sin_addr.s_addr = msg->pkt->nh.iph->saddr;
|
|
|
|
|
|
|
|
msghdr.msg_name = &sin;
|
|
|
|
msghdr.msg_namelen = sizeof(sin);
|
|
|
|
msghdr.msg_control = NULL;
|
|
|
|
msghdr.msg_controllen = 0;
|
|
|
|
msghdr.msg_flags = MSG_DONTWAIT;
|
|
|
|
|
|
|
|
_net("Sending message type %d of %d bytes to %08x:%d",
|
|
|
|
ahdr.type,
|
|
|
|
len,
|
|
|
|
ntohl(sin.sin_addr.s_addr),
|
|
|
|
ntohs(sin.sin_port));
|
|
|
|
|
|
|
|
/* send the message */
|
|
|
|
ret = kernel_sendmsg(trans->socket, &msghdr, iov, 2, len);
|
|
|
|
|
|
|
|
_leave(" = %d", ret);
|
|
|
|
return ret;
|
|
|
|
} /* end rxrpc_trans_immediate_abort() */
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
/*
|
|
|
|
* receive an ICMP error report and percolate it to all connections
|
|
|
|
* heading to the affected host or port
|
|
|
|
*/
|
|
|
|
static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans)
|
|
|
|
{
|
|
|
|
struct rxrpc_connection *conn;
|
|
|
|
struct sockaddr_in sin;
|
|
|
|
struct rxrpc_peer *peer;
|
|
|
|
struct list_head connq, *_p;
|
|
|
|
struct errormsg emsg;
|
|
|
|
struct msghdr msg;
|
|
|
|
__be16 port;
|
|
|
|
int local, err;
|
|
|
|
|
|
|
|
_enter("%p", trans);
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
trans->error_rcvd = 0;
|
|
|
|
|
|
|
|
/* try and receive an error message */
|
|
|
|
msg.msg_name = &sin;
|
|
|
|
msg.msg_namelen = sizeof(sin);
|
|
|
|
msg.msg_control = &emsg;
|
|
|
|
msg.msg_controllen = sizeof(emsg);
|
|
|
|
msg.msg_flags = 0;
|
|
|
|
|
|
|
|
err = kernel_recvmsg(trans->socket, &msg, NULL, 0, 0,
|
|
|
|
MSG_ERRQUEUE | MSG_DONTWAIT | MSG_TRUNC);
|
|
|
|
|
|
|
|
if (err == -EAGAIN) {
|
|
|
|
_leave("");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err < 0) {
|
|
|
|
printk("%s: unable to recv an error report: %d\n",
|
|
|
|
__FUNCTION__, err);
|
|
|
|
_leave("");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
msg.msg_controllen = (char *) msg.msg_control - (char *) &emsg;
|
|
|
|
|
|
|
|
if (msg.msg_controllen < sizeof(emsg.cmsg) ||
|
|
|
|
msg.msg_namelen < sizeof(sin)) {
|
|
|
|
printk("%s: short control message"
|
|
|
|
" (nlen=%u clen=%Zu fl=%x)\n",
|
|
|
|
__FUNCTION__,
|
|
|
|
msg.msg_namelen,
|
|
|
|
msg.msg_controllen,
|
|
|
|
msg.msg_flags);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
_net("Rx Received control message"
|
|
|
|
" { len=%Zu level=%u type=%u }",
|
|
|
|
emsg.cmsg.cmsg_len,
|
|
|
|
emsg.cmsg.cmsg_level,
|
|
|
|
emsg.cmsg.cmsg_type);
|
|
|
|
|
|
|
|
if (sin.sin_family != AF_INET) {
|
|
|
|
printk("Rx Ignoring error report with non-INET address"
|
|
|
|
" (fam=%u)",
|
|
|
|
sin.sin_family);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
_net("Rx Received message pertaining to host addr=%x port=%hu",
|
|
|
|
ntohl(sin.sin_addr.s_addr), ntohs(sin.sin_port));
|
|
|
|
|
|
|
|
if (emsg.cmsg.cmsg_level != SOL_IP ||
|
|
|
|
emsg.cmsg.cmsg_type != IP_RECVERR) {
|
|
|
|
printk("Rx Ignoring unknown error report"
|
|
|
|
" { level=%u type=%u }",
|
|
|
|
emsg.cmsg.cmsg_level,
|
|
|
|
emsg.cmsg.cmsg_type);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (msg.msg_controllen < sizeof(emsg.cmsg) + sizeof(emsg.ee)) {
|
|
|
|
printk("%s: short error message (%Zu)\n",
|
|
|
|
__FUNCTION__, msg.msg_controllen);
|
|
|
|
_leave("");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
port = sin.sin_port;
|
|
|
|
|
|
|
|
switch (emsg.ee.ee_origin) {
|
|
|
|
case SO_EE_ORIGIN_ICMP:
|
|
|
|
local = 0;
|
|
|
|
switch (emsg.ee.ee_type) {
|
|
|
|
case ICMP_DEST_UNREACH:
|
|
|
|
switch (emsg.ee.ee_code) {
|
|
|
|
case ICMP_NET_UNREACH:
|
|
|
|
_net("Rx Received ICMP Network Unreachable");
|
|
|
|
port = 0;
|
|
|
|
err = -ENETUNREACH;
|
|
|
|
break;
|
|
|
|
case ICMP_HOST_UNREACH:
|
|
|
|
_net("Rx Received ICMP Host Unreachable");
|
|
|
|
port = 0;
|
|
|
|
err = -EHOSTUNREACH;
|
|
|
|
break;
|
|
|
|
case ICMP_PORT_UNREACH:
|
|
|
|
_net("Rx Received ICMP Port Unreachable");
|
|
|
|
err = -ECONNREFUSED;
|
|
|
|
break;
|
|
|
|
case ICMP_NET_UNKNOWN:
|
|
|
|
_net("Rx Received ICMP Unknown Network");
|
|
|
|
port = 0;
|
|
|
|
err = -ENETUNREACH;
|
|
|
|
break;
|
|
|
|
case ICMP_HOST_UNKNOWN:
|
|
|
|
_net("Rx Received ICMP Unknown Host");
|
|
|
|
port = 0;
|
|
|
|
err = -EHOSTUNREACH;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
_net("Rx Received ICMP DestUnreach { code=%u }",
|
|
|
|
emsg.ee.ee_code);
|
|
|
|
err = emsg.ee.ee_errno;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case ICMP_TIME_EXCEEDED:
|
|
|
|
_net("Rx Received ICMP TTL Exceeded");
|
|
|
|
err = emsg.ee.ee_errno;
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
_proto("Rx Received ICMP error { type=%u code=%u }",
|
|
|
|
emsg.ee.ee_type, emsg.ee.ee_code);
|
|
|
|
err = emsg.ee.ee_errno;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case SO_EE_ORIGIN_LOCAL:
|
|
|
|
_proto("Rx Received local error { error=%d }",
|
|
|
|
emsg.ee.ee_errno);
|
|
|
|
local = 1;
|
|
|
|
err = emsg.ee.ee_errno;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case SO_EE_ORIGIN_NONE:
|
|
|
|
case SO_EE_ORIGIN_ICMP6:
|
|
|
|
default:
|
|
|
|
_proto("Rx Received error report { orig=%u }",
|
|
|
|
emsg.ee.ee_origin);
|
|
|
|
local = 0;
|
|
|
|
err = emsg.ee.ee_errno;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* find all the connections between this transport and the
|
|
|
|
* affected destination */
|
|
|
|
INIT_LIST_HEAD(&connq);
|
|
|
|
|
|
|
|
if (rxrpc_peer_lookup(trans, sin.sin_addr.s_addr,
|
|
|
|
&peer) == 0) {
|
|
|
|
read_lock(&peer->conn_lock);
|
|
|
|
list_for_each(_p, &peer->conn_active) {
|
|
|
|
conn = list_entry(_p, struct rxrpc_connection,
|
|
|
|
link);
|
|
|
|
if (port && conn->addr.sin_port != port)
|
|
|
|
continue;
|
|
|
|
if (!list_empty(&conn->err_link))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
rxrpc_get_connection(conn);
|
|
|
|
list_add_tail(&conn->err_link, &connq);
|
|
|
|
}
|
|
|
|
read_unlock(&peer->conn_lock);
|
|
|
|
|
|
|
|
/* service all those connections */
|
|
|
|
while (!list_empty(&connq)) {
|
|
|
|
conn = list_entry(connq.next,
|
|
|
|
struct rxrpc_connection,
|
|
|
|
err_link);
|
|
|
|
list_del(&conn->err_link);
|
|
|
|
|
|
|
|
rxrpc_conn_handle_error(conn, local, err);
|
|
|
|
|
|
|
|
rxrpc_put_connection(conn);
|
|
|
|
}
|
|
|
|
|
|
|
|
rxrpc_put_peer(peer);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
_leave("");
|
|
|
|
return;
|
|
|
|
} /* end rxrpc_trans_receive_error_report() */
|