diff options
Diffstat (limited to 'net/rxrpc/connection.c')
| -rw-r--r-- | net/rxrpc/connection.c | 777 |
1 files changed, 0 insertions, 777 deletions
diff --git a/net/rxrpc/connection.c b/net/rxrpc/connection.c deleted file mode 100644 index 665a9995244..00000000000 --- a/net/rxrpc/connection.c +++ /dev/null @@ -1,777 +0,0 @@ -/* connection.c: Rx connection routines - * - * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <rxrpc/rxrpc.h> -#include <rxrpc/transport.h> -#include <rxrpc/peer.h> -#include <rxrpc/connection.h> -#include <rxrpc/call.h> -#include <rxrpc/message.h> -#include <linux/udp.h> -#include <linux/ip.h> -#include <net/sock.h> -#include <asm/uaccess.h> -#include "internal.h" - -__RXACCT_DECL(atomic_t rxrpc_connection_count); - -LIST_HEAD(rxrpc_conns); -DECLARE_RWSEM(rxrpc_conns_sem); -unsigned long rxrpc_conn_timeout = 60 * 60; - -static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn); - -static void __rxrpc_conn_timeout(rxrpc_timer_t *timer) -{ - struct rxrpc_connection *conn = - list_entry(timer, struct rxrpc_connection, timeout); - - _debug("Rx CONN TIMEOUT [%p{u=%d}]", conn, atomic_read(&conn->usage)); - - rxrpc_conn_do_timeout(conn); -} - -static const struct rxrpc_timer_ops rxrpc_conn_timer_ops = { - .timed_out = __rxrpc_conn_timeout, -}; - -/*****************************************************************************/ -/* - * create a new connection record - */ -static inline int __rxrpc_create_connection(struct rxrpc_peer *peer, - struct rxrpc_connection **_conn) -{ - struct rxrpc_connection *conn; - - _enter("%p",peer); - - /* allocate and initialise a connection record */ - conn = kzalloc(sizeof(struct rxrpc_connection), GFP_KERNEL); - if (!conn) { - _leave(" = -ENOMEM"); - return -ENOMEM; - } - - atomic_set(&conn->usage, 1); - - INIT_LIST_HEAD(&conn->link); - INIT_LIST_HEAD(&conn->id_link); - init_waitqueue_head(&conn->chanwait); - spin_lock_init(&conn->lock); - rxrpc_timer_init(&conn->timeout, &rxrpc_conn_timer_ops); - - do_gettimeofday(&conn->atime); - conn->mtu_size = 1024; - conn->peer = peer; - conn->trans = peer->trans; - - __RXACCT(atomic_inc(&rxrpc_connection_count)); - *_conn = conn; - _leave(" = 0 (%p)", conn); - - return 0; -} /* end __rxrpc_create_connection() */ - -/*****************************************************************************/ -/* - * create a new connection record for outgoing connections - */ -int rxrpc_create_connection(struct rxrpc_transport *trans, - __be16 port, - __be32 addr, - uint16_t service_id, - void *security, - struct rxrpc_connection **_conn) -{ - struct rxrpc_connection *candidate, *conn; - struct rxrpc_peer *peer; - struct list_head *_p; - __be32 connid; - int ret; - - _enter("%p{%hu},%u,%hu", trans, trans->port, ntohs(port), service_id); - - /* get a peer record */ - ret = rxrpc_peer_lookup(trans, addr, &peer); - if (ret < 0) { - _leave(" = %d", ret); - return ret; - } - - /* allocate and initialise a connection record */ - ret = __rxrpc_create_connection(peer, &candidate); - if (ret < 0) { - rxrpc_put_peer(peer); - _leave(" = %d", ret); - return ret; - } - - /* fill in the specific bits */ - candidate->addr.sin_family = AF_INET; - candidate->addr.sin_port = port; - candidate->addr.sin_addr.s_addr = addr; - - candidate->in_epoch = rxrpc_epoch; - candidate->out_epoch = rxrpc_epoch; - candidate->in_clientflag = 0; - candidate->out_clientflag = RXRPC_CLIENT_INITIATED; - candidate->service_id = htons(service_id); - - /* invent a unique connection ID */ - write_lock(&peer->conn_idlock); - - try_next_id: - connid = htonl(peer->conn_idcounter & RXRPC_CIDMASK); - peer->conn_idcounter += RXRPC_MAXCALLS; - - list_for_each(_p, &peer->conn_idlist) { - conn = list_entry(_p, struct rxrpc_connection, id_link); - if (connid == conn->conn_id) - goto try_next_id; - if (connid > conn->conn_id) - break; - } - - _debug("selected candidate conn ID %x.%u", - ntohl(peer->addr.s_addr), ntohl(connid)); - - candidate->conn_id = connid; - list_add_tail(&candidate->id_link, _p); - - write_unlock(&peer->conn_idlock); - - /* attach to peer */ - candidate->peer = peer; - - write_lock(&peer->conn_lock); - - /* search the peer's transport graveyard list */ - spin_lock(&peer->conn_gylock); - list_for_each(_p, &peer->conn_graveyard) { - conn = list_entry(_p, struct rxrpc_connection, link); - if (conn->addr.sin_port == candidate->addr.sin_port && - conn->security_ix == candidate->security_ix && - conn->service_id == candidate->service_id && - conn->in_clientflag == 0) - goto found_in_graveyard; - } - spin_unlock(&peer->conn_gylock); - - /* pick the new candidate */ - _debug("created connection: {%08x} [out]", ntohl(candidate->conn_id)); - atomic_inc(&peer->conn_count); - conn = candidate; - candidate = NULL; - - make_active: - list_add_tail(&conn->link, &peer->conn_active); - write_unlock(&peer->conn_lock); - - if (candidate) { - write_lock(&peer->conn_idlock); - list_del(&candidate->id_link); - write_unlock(&peer->conn_idlock); - - __RXACCT(atomic_dec(&rxrpc_connection_count)); - kfree(candidate); - } - else { - down_write(&rxrpc_conns_sem); - list_add_tail(&conn->proc_link, &rxrpc_conns); - up_write(&rxrpc_conns_sem); - } - - *_conn = conn; - _leave(" = 0 (%p)", conn); - - return 0; - - /* handle resurrecting a connection from the graveyard */ - found_in_graveyard: - _debug("resurrecting connection: {%08x} [out]", ntohl(conn->conn_id)); - rxrpc_get_connection(conn); - rxrpc_krxtimod_del_timer(&conn->timeout); - list_del_init(&conn->link); - spin_unlock(&peer->conn_gylock); - goto make_active; -} /* end rxrpc_create_connection() */ - -/*****************************************************************************/ -/* - * lookup the connection for an incoming packet - * - create a new connection record for unrecorded incoming connections - */ -int rxrpc_connection_lookup(struct rxrpc_peer *peer, - struct rxrpc_message *msg, - struct rxrpc_connection **_conn) -{ - struct rxrpc_connection *conn, *candidate = NULL; - struct list_head *_p; - struct sk_buff *pkt = msg->pkt; - int ret, fresh = 0; - __be32 x_epoch, x_connid; - __be16 x_port, x_servid; - __u32 x_secix; - u8 x_clflag; - - _enter("%p{{%hu}},%u,%hu", - peer, - peer->trans->port, - ntohs(udp_hdr(pkt)->source), - ntohs(msg->hdr.serviceId)); - - x_port = udp_hdr(pkt)->source; - x_epoch = msg->hdr.epoch; - x_clflag = msg->hdr.flags & RXRPC_CLIENT_INITIATED; - x_connid = htonl(ntohl(msg->hdr.cid) & RXRPC_CIDMASK); - x_servid = msg->hdr.serviceId; - x_secix = msg->hdr.securityIndex; - - /* [common case] search the transport's active list first */ - read_lock(&peer->conn_lock); - list_for_each(_p, &peer->conn_active) { - conn = list_entry(_p, struct rxrpc_connection, link); - if (conn->addr.sin_port == x_port && - conn->in_epoch == x_epoch && - conn->conn_id == x_connid && - conn->security_ix == x_secix && - conn->service_id == x_servid && - conn->in_clientflag == x_clflag) - goto found_active; - } - read_unlock(&peer->conn_lock); - - /* [uncommon case] not active - * - create a candidate for a new record if an inbound connection - * - only examine the graveyard for an outbound connection - */ - if (x_clflag) { - ret = __rxrpc_create_connection(peer, &candidate); - if (ret < 0) { - _leave(" = %d", ret); - return ret; - } - - /* fill in the specifics */ - candidate->addr.sin_family = AF_INET; - candidate->addr.sin_port = x_port; - candidate->addr.sin_addr.s_addr = ip_hdr(pkt)->saddr; - candidate->in_epoch = x_epoch; - candidate->out_epoch = x_epoch; - candidate->in_clientflag = RXRPC_CLIENT_INITIATED; - candidate->out_clientflag = 0; - candidate->conn_id = x_connid; - candidate->service_id = x_servid; - candidate->security_ix = x_secix; - } - - /* search the active list again, just in case it appeared whilst we - * were busy */ - write_lock(&peer->conn_lock); - list_for_each(_p, &peer->conn_active) { - conn = list_entry(_p, struct rxrpc_connection, link); - if (conn->addr.sin_port == x_port && - conn->in_epoch == x_epoch && - conn->conn_id == x_connid && - conn->security_ix == x_secix && - conn->service_id == x_servid && - conn->in_clientflag == x_clflag) - goto found_active_second_chance; - } - - /* search the transport's graveyard list */ - spin_lock(&peer->conn_gylock); - list_for_each(_p, &peer->conn_graveyard) { - conn = list_entry(_p, struct rxrpc_connection, link); - if (conn->addr.sin_port == x_port && - conn->in_epoch == x_epoch && - conn->conn_id == x_connid && - conn->security_ix == x_secix && - conn->service_id == x_servid && - conn->in_clientflag == x_clflag) - goto found_in_graveyard; - } - spin_unlock(&peer->conn_gylock); - - /* outbound connections aren't created here */ - if (!x_clflag) { - write_unlock(&peer->conn_lock); - _leave(" = -ENOENT"); - return -ENOENT; - } - - /* we can now add the new candidate to the list */ - _debug("created connection: {%08x} [in]", ntohl(candidate->conn_id)); - rxrpc_get_peer(peer); - conn = candidate; - candidate = NULL; - atomic_inc(&peer->conn_count); - fresh = 1; - - make_active: - list_add_tail(&conn->link, &peer->conn_active); - - success_uwfree: - write_unlock(&peer->conn_lock); - - if (candidate) { - write_lock(&peer->conn_idlock); - list_del(&candidate->id_link); - write_unlock(&peer->conn_idlock); - - __RXACCT(atomic_dec(&rxrpc_connection_count)); - kfree(candidate); - } - - if (fresh) { - down_write(&rxrpc_conns_sem); - list_add_tail(&conn->proc_link, &rxrpc_conns); - up_write(&rxrpc_conns_sem); - } - - success: - *_conn = conn; - _leave(" = 0 (%p)", conn); - return 0; - - /* handle the connection being found in the active list straight off */ - found_active: - rxrpc_get_connection(conn); - read_unlock(&peer->conn_lock); - goto success; - - /* handle resurrecting a connection from the graveyard */ - found_in_graveyard: - _debug("resurrecting connection: {%08x} [in]", ntohl(conn->conn_id)); - rxrpc_get_peer(peer); - rxrpc_get_connection(conn); - rxrpc_krxtimod_del_timer(&conn->timeout); - list_del_init(&conn->link); - spin_unlock(&peer->conn_gylock); - goto make_active; - - /* handle finding the connection on the second time through the active - * list */ - found_active_second_chance: - rxrpc_get_connection(conn); - goto success_uwfree; - -} /* end rxrpc_connection_lookup() */ - -/*****************************************************************************/ -/* - * finish using a connection record - * - it will be transferred to the peer's connection graveyard when refcount - * reaches 0 - */ -void rxrpc_put_connection(struct rxrpc_connection *conn) -{ - struct rxrpc_peer *peer; - - if (!conn) - return; - - _enter("%p{u=%d p=%hu}", - conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port)); - - peer = conn->peer; - spin_lock(&peer->conn_gylock); - - /* sanity check */ - if (atomic_read(&conn->usage) <= 0) - BUG(); - - if (likely(!atomic_dec_and_test(&conn->usage))) { - spin_unlock(&peer->conn_gylock); - _leave(""); - return; - } - - /* move to graveyard queue */ - _debug("burying connection: {%08x}", ntohl(conn->conn_id)); - list_move_tail(&conn->link, &peer->conn_graveyard); - - rxrpc_krxtimod_add_timer(&conn->timeout, rxrpc_conn_timeout * HZ); - - spin_unlock(&peer->conn_gylock); - - rxrpc_put_peer(conn->peer); - - _leave(" [killed]"); -} /* end rxrpc_put_connection() */ - -/*****************************************************************************/ -/* - * free a connection record - */ -static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn) -{ - struct rxrpc_peer *peer; - - _enter("%p{u=%d p=%hu}", - conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port)); - - peer = conn->peer; - - if (atomic_read(&conn->usage) < 0) - BUG(); - - /* remove from graveyard if still dead */ - spin_lock(&peer->conn_gylock); - if (atomic_read(&conn->usage) == 0) { - list_del_init(&conn->link); - } - else { - conn = NULL; - } - spin_unlock(&peer->conn_gylock); - - if (!conn) { - _leave(""); - return; /* resurrected */ - } - - _debug("--- Destroying Connection %p{%08x} ---", - conn, ntohl(conn->conn_id)); - - down_write(&rxrpc_conns_sem); - list_del(&conn->proc_link); - up_write(&rxrpc_conns_sem); - - write_lock(&peer->conn_idlock); - list_del(&conn->id_link); - write_unlock(&peer->conn_idlock); - - __RXACCT(atomic_dec(&rxrpc_connection_count)); - kfree(conn); - - /* if the graveyard is now empty, wake up anyone waiting for that */ - if (atomic_dec_and_test(&peer->conn_count)) - wake_up(&peer->conn_gy_waitq); - - _leave(" [destroyed]"); -} /* end rxrpc_conn_do_timeout() */ - -/*****************************************************************************/ -/* - * clear all connection records from a peer endpoint - */ -void rxrpc_conn_clearall(struct rxrpc_peer *peer) -{ - DECLARE_WAITQUEUE(myself, current); - - struct rxrpc_connection *conn; - int err; - - _enter("%p", peer); - - /* there shouldn't be any active conns remaining */ - if (!list_empty(&peer->conn_active)) - BUG(); - - /* manually timeout all conns in the graveyard */ - spin_lock(&peer->conn_gylock); - while (!list_empty(&peer->conn_graveyard)) { - conn = list_entry(peer->conn_graveyard.next, - struct rxrpc_connection, link); - err = rxrpc_krxtimod_del_timer(&conn->timeout); - spin_unlock(&peer->conn_gylock); - - if (err == 0) - rxrpc_conn_do_timeout(conn); - - spin_lock(&peer->conn_gylock); - } - spin_unlock(&peer->conn_gylock); - - /* wait for the the conn graveyard to be completely cleared */ - set_current_state(TASK_UNINTERRUPTIBLE); - add_wait_queue(&peer->conn_gy_waitq, &myself); - - while (atomic_read(&peer->conn_count) != 0) { - schedule(); - set_current_state(TASK_UNINTERRUPTIBLE); - } - - remove_wait_queue(&peer->conn_gy_waitq, &myself); - set_current_state(TASK_RUNNING); - - _leave(""); -} /* end rxrpc_conn_clearall() */ - -/*****************************************************************************/ -/* - * allocate and prepare a message for sending out through the transport - * endpoint - */ -int rxrpc_conn_newmsg(struct rxrpc_connection *conn, - struct rxrpc_call *call, - uint8_t type, - int dcount, - struct kvec diov[], - gfp_t alloc_flags, - struct rxrpc_message **_msg) -{ - struct rxrpc_message *msg; - int loop; - - _enter("%p{%d},%p,%u", conn, ntohs(conn->addr.sin_port), call, type); - - if (dcount > 3) { - _leave(" = -EINVAL"); - return -EINVAL; - } - - msg = kzalloc(sizeof(struct rxrpc_message), alloc_flags); - if (!msg) { - _leave(" = -ENOMEM"); - return -ENOMEM; - } - - atomic_set(&msg->usage, 1); - - INIT_LIST_HEAD(&msg->link); - - msg->state = RXRPC_MSG_PREPARED; - - msg->hdr.epoch = conn->out_epoch; - msg->hdr.cid = conn->conn_id | (call ? call->chan_ix : 0); - msg->hdr.callNumber = call ? call->call_id : 0; - msg->hdr.type = type; - msg->hdr.flags = conn->out_clientflag; - msg->hdr.securityIndex = conn->security_ix; - msg->hdr.serviceId = conn->service_id; - - /* generate sequence numbers for data packets */ - if (call) { - switch (type) { - case RXRPC_PACKET_TYPE_DATA: - msg->seq = ++call->snd_seq_count; - msg->hdr.seq = htonl(msg->seq); - break; - case RXRPC_PACKET_TYPE_ACK: - /* ACK sequence numbers are complicated. The following - * may be wrong: - * - jumbo packet ACKs should have a seq number - * - normal ACKs should not - */ - default: - break; - } - } - - msg->dcount = dcount + 1; - msg->dsize = sizeof(msg->hdr); - msg->data[0].iov_len = sizeof(msg->hdr); - msg->data[0].iov_base = &msg->hdr; - - for (loop=0; loop < dcount; loop++) { - msg->dsize += diov[loop].iov_len; - msg->data[loop+1].iov_len = diov[loop].iov_len; - msg->data[loop+1].iov_base = diov[loop].iov_base; - } - - __RXACCT(atomic_inc(&rxrpc_message_count)); - *_msg = msg; - _leave(" = 0 (%p) #%d", msg, atomic_read(&rxrpc_message_count)); - return 0; -} /* end rxrpc_conn_newmsg() */ - -/*****************************************************************************/ -/* - * free a message - */ -void __rxrpc_put_message(struct rxrpc_message *msg) -{ - int loop; - - _enter("%p #%d", msg, atomic_read(&rxrpc_message_count)); - - if (msg->pkt) - kfree_skb(msg->pkt); - rxrpc_put_connection(msg->conn); - - for (loop = 0; loop < 8; loop++) - if (test_bit(loop, &msg->dfree)) - kfree(msg->data[loop].iov_base); - - __RXACCT(atomic_dec(&rxrpc_message_count)); - kfree(msg); - - _leave(""); -} /* end __rxrpc_put_message() */ - -/*****************************************************************************/ -/* - * send a message out through the transport endpoint - */ -int rxrpc_conn_sendmsg(struct rxrpc_connection *conn, - struct rxrpc_message *msg) -{ - struct msghdr msghdr; - int ret; - - _enter("%p{%d}", conn, ntohs(conn->addr.sin_port)); - - /* fill in some fields in the header */ - spin_lock(&conn->lock); - msg->hdr.serial = htonl(++conn->serial_counter); - msg->rttdone = 0; - spin_unlock(&conn->lock); - - /* set up the message to be transmitted */ - msghdr.msg_name = &conn->addr; - msghdr.msg_namelen = sizeof(conn->addr); - msghdr.msg_control = NULL; - msghdr.msg_controllen = 0; - msghdr.msg_flags = MSG_CONFIRM | MSG_DONTWAIT; - - _net("Sending message type %d of %Zd bytes to %08x:%d", - msg->hdr.type, - msg->dsize, - ntohl(conn->addr.sin_addr.s_addr), - ntohs(conn->addr.sin_port)); - - /* send the message */ - ret = kernel_sendmsg(conn->trans->socket, &msghdr, - msg->data, msg->dcount, msg->dsize); - if (ret < 0) { - msg->state = RXRPC_MSG_ERROR; - } else { - msg->state = RXRPC_MSG_SENT; - ret = 0; - - spin_lock(&conn->lock); - do_gettimeofday(&conn->atime); - msg->stamp = conn->atime; - spin_unlock(&conn->lock); - } - - _leave(" = %d", ret); - - return ret; -} /* end rxrpc_conn_sendmsg() */ - -/*****************************************************************************/ -/* - * deal with a subsequent call packet - */ -int rxrpc_conn_receive_call_packet(struct rxrpc_connection *conn, - struct rxrpc_call *call, - struct rxrpc_message *msg) -{ - struct rxrpc_message *pmsg; - struct dst_entry *dst; - struct list_head *_p; - unsigned cix, seq; - int ret = 0; - - _enter("%p,%p,%p", conn, call, msg); - - if (!call) { - cix = ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK; - - spin_lock(&conn->lock); - call = conn->channels[cix]; - - if (!call || call->call_id != msg->hdr.callNumber) { - spin_unlock(&conn->lock); - rxrpc_trans_immediate_abort(conn->trans, msg, -ENOENT); - goto out; - } - else { - rxrpc_get_call(call); - spin_unlock(&conn->lock); - } - } - else { - rxrpc_get_call(call); - } - - _proto("Received packet %%%u [%u] on call %hu:%u:%u", - ntohl(msg->hdr.serial), - ntohl(msg->hdr.seq), - ntohs(msg->hdr.serviceId), - ntohl(conn->conn_id), - ntohl(call->call_id)); - - call->pkt_rcv_count++; - - dst = msg->pkt->dst; - if (dst && dst->dev) - conn->peer->if_mtu = - dst->dev->mtu - dst->dev->hard_header_len; - - /* queue on the call in seq order */ - rxrpc_get_message(msg); - seq = msg->seq; - - spin_lock(&call->lock); - list_for_each(_p, &call->rcv_receiveq) { - pmsg = list_entry(_p, struct rxrpc_message, link); - if (pmsg->seq > seq) - break; - } - list_add_tail(&msg->link, _p); - - /* reset the activity timeout */ - call->flags |= RXRPC_CALL_RCV_PKT; - mod_timer(&call->rcv_timeout,jiffies + rxrpc_call_rcv_timeout * HZ); - - spin_unlock(&call->lock); - - rxrpc_krxiod_queue_call(call); - - rxrpc_put_call(call); - out: - _leave(" = %d", ret); - return ret; -} /* end rxrpc_conn_receive_call_packet() */ - -/*****************************************************************************/ -/* - * handle an ICMP error being applied to a connection - */ -void rxrpc_conn_handle_error(struct rxrpc_connection *conn, - int local, int errno) -{ - struct rxrpc_call *calls[4]; - int loop; - - _enter("%p{%d},%d", conn, ntohs(conn->addr.sin_port), errno); - - /* get a ref to all my calls in one go */ - memset(calls, 0, sizeof(calls)); - spin_lock(&conn->lock); - - for (loop = 3; loop >= 0; loop--) { - if (conn->channels[loop]) { - calls[loop] = conn->channels[loop]; - rxrpc_get_call(calls[loop]); - } - } - - spin_unlock(&conn->lock); - - /* now kick them all */ - for (loop = 3; loop >= 0; loop--) { - if (calls[loop]) { - rxrpc_call_handle_error(calls[loop], local, errno); - rxrpc_put_call(calls[loop]); - } - } - - _leave(""); -} /* end rxrpc_conn_handle_error() */ |