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![David Howells](/assets/img/avatar_default.png)
Connections that have seen a connection-level abort should not be reused as the far end will just abort them again; instead a new connection should be made. Connection-level aborts occur due to such things as authentication failures. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
408 lines
9.1 KiB
C
408 lines
9.1 KiB
C
/* connection-level event handling
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*
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* Copyright (C) 2007 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/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/errqueue.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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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include <net/ip.h>
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#include "ar-internal.h"
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/*
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* pass a connection-level abort onto all calls on that connection
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*/
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static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
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u32 abort_code)
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{
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struct rxrpc_call *call;
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struct rb_node *p;
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_enter("{%d},%x", conn->debug_id, abort_code);
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read_lock_bh(&conn->lock);
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for (p = rb_first(&conn->calls); p; p = rb_next(p)) {
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call = rb_entry(p, struct rxrpc_call, conn_node);
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write_lock(&call->state_lock);
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if (call->state <= RXRPC_CALL_COMPLETE) {
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call->state = state;
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call->abort_code = abort_code;
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if (state == RXRPC_CALL_LOCALLY_ABORTED)
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set_bit(RXRPC_CALL_CONN_ABORT, &call->events);
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else
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set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
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rxrpc_queue_call(call);
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}
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write_unlock(&call->state_lock);
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}
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read_unlock_bh(&conn->lock);
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_leave("");
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}
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/*
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* generate a connection-level abort
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*/
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static int rxrpc_abort_connection(struct rxrpc_connection *conn,
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u32 error, u32 abort_code)
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{
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struct rxrpc_header hdr;
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struct msghdr msg;
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struct kvec iov[2];
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__be32 word;
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size_t len;
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int ret;
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_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
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/* generate a connection-level abort */
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spin_lock_bh(&conn->state_lock);
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if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) {
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conn->state = RXRPC_CONN_LOCALLY_ABORTED;
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conn->error = error;
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spin_unlock_bh(&conn->state_lock);
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} else {
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spin_unlock_bh(&conn->state_lock);
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_leave(" = 0 [already dead]");
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return 0;
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}
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rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
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msg.msg_name = &conn->trans->peer->srx.transport.sin;
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msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin);
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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hdr.epoch = conn->epoch;
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hdr.cid = conn->cid;
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hdr.callNumber = 0;
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hdr.seq = 0;
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hdr.type = RXRPC_PACKET_TYPE_ABORT;
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hdr.flags = conn->out_clientflag;
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hdr.userStatus = 0;
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hdr.securityIndex = conn->security_ix;
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hdr._rsvd = 0;
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hdr.serviceId = conn->service_id;
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word = htonl(abort_code);
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iov[0].iov_base = &hdr;
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iov[0].iov_len = sizeof(hdr);
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iov[1].iov_base = &word;
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iov[1].iov_len = sizeof(word);
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len = iov[0].iov_len + iov[1].iov_len;
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hdr.serial = htonl(atomic_inc_return(&conn->serial));
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_proto("Tx CONN ABORT %%%u { %d }", ntohl(hdr.serial), abort_code);
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ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len);
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if (ret < 0) {
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_debug("sendmsg failed: %d", ret);
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return -EAGAIN;
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}
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_leave(" = 0");
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return 0;
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}
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/*
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* mark a call as being on a now-secured channel
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* - must be called with softirqs disabled
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*/
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static void rxrpc_call_is_secure(struct rxrpc_call *call)
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{
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_enter("%p", call);
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if (call) {
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read_lock(&call->state_lock);
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if (call->state < RXRPC_CALL_COMPLETE &&
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!test_and_set_bit(RXRPC_CALL_SECURED, &call->events))
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rxrpc_queue_call(call);
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read_unlock(&call->state_lock);
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}
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}
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/*
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* connection-level Rx packet processor
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*/
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static int rxrpc_process_event(struct rxrpc_connection *conn,
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struct sk_buff *skb,
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u32 *_abort_code)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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__be32 tmp;
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u32 serial;
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int loop, ret;
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if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
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kleave(" = -ECONNABORTED [%u]", conn->state);
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return -ECONNABORTED;
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}
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serial = ntohl(sp->hdr.serial);
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_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, serial);
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switch (sp->hdr.type) {
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case RXRPC_PACKET_TYPE_ABORT:
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if (skb_copy_bits(skb, 0, &tmp, sizeof(tmp)) < 0)
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return -EPROTO;
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_proto("Rx ABORT %%%u { ac=%d }", serial, ntohl(tmp));
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conn->state = RXRPC_CONN_REMOTELY_ABORTED;
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rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
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ntohl(tmp));
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return -ECONNABORTED;
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case RXRPC_PACKET_TYPE_CHALLENGE:
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if (conn->security)
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return conn->security->respond_to_challenge(
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conn, skb, _abort_code);
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return -EPROTO;
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case RXRPC_PACKET_TYPE_RESPONSE:
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if (!conn->security)
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return -EPROTO;
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ret = conn->security->verify_response(conn, skb, _abort_code);
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if (ret < 0)
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return ret;
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ret = conn->security->init_connection_security(conn);
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if (ret < 0)
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return ret;
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conn->security->prime_packet_security(conn);
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read_lock_bh(&conn->lock);
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spin_lock(&conn->state_lock);
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if (conn->state == RXRPC_CONN_SERVER_CHALLENGING) {
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conn->state = RXRPC_CONN_SERVER;
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for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
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rxrpc_call_is_secure(conn->channels[loop]);
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}
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spin_unlock(&conn->state_lock);
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read_unlock_bh(&conn->lock);
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return 0;
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default:
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_leave(" = -EPROTO [%u]", sp->hdr.type);
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return -EPROTO;
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}
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}
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/*
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* set up security and issue a challenge
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*/
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static void rxrpc_secure_connection(struct rxrpc_connection *conn)
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{
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u32 abort_code;
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int ret;
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_enter("{%d}", conn->debug_id);
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ASSERT(conn->security_ix != 0);
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if (!conn->key) {
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_debug("set up security");
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ret = rxrpc_init_server_conn_security(conn);
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switch (ret) {
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case 0:
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break;
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case -ENOENT:
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abort_code = RX_CALL_DEAD;
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goto abort;
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default:
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abort_code = RXKADNOAUTH;
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goto abort;
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}
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}
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ASSERT(conn->security != NULL);
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if (conn->security->issue_challenge(conn) < 0) {
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abort_code = RX_CALL_DEAD;
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ret = -ENOMEM;
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goto abort;
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}
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_leave("");
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return;
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abort:
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_debug("abort %d, %d", ret, abort_code);
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rxrpc_abort_connection(conn, -ret, abort_code);
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_leave(" [aborted]");
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}
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/*
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* connection-level event processor
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*/
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void rxrpc_process_connection(struct work_struct *work)
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{
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struct rxrpc_connection *conn =
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container_of(work, struct rxrpc_connection, processor);
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struct rxrpc_skb_priv *sp;
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struct sk_buff *skb;
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u32 abort_code = RX_PROTOCOL_ERROR;
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int ret;
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_enter("{%d}", conn->debug_id);
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atomic_inc(&conn->usage);
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if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) {
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rxrpc_secure_connection(conn);
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rxrpc_put_connection(conn);
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}
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/* go through the conn-level event packets, releasing the ref on this
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* connection that each one has when we've finished with it */
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while ((skb = skb_dequeue(&conn->rx_queue))) {
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sp = rxrpc_skb(skb);
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ret = rxrpc_process_event(conn, skb, &abort_code);
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switch (ret) {
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case -EPROTO:
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case -EKEYEXPIRED:
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case -EKEYREJECTED:
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goto protocol_error;
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case -EAGAIN:
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goto requeue_and_leave;
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case -ECONNABORTED:
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default:
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rxrpc_put_connection(conn);
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rxrpc_free_skb(skb);
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break;
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}
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}
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out:
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rxrpc_put_connection(conn);
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_leave("");
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return;
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requeue_and_leave:
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skb_queue_head(&conn->rx_queue, skb);
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goto out;
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protocol_error:
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if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
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goto requeue_and_leave;
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rxrpc_put_connection(conn);
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rxrpc_free_skb(skb);
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_leave(" [EPROTO]");
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goto out;
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}
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/*
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* put a packet up for transport-level abort
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*/
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void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
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{
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CHECK_SLAB_OKAY(&local->usage);
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if (!atomic_inc_not_zero(&local->usage)) {
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printk("resurrected on reject\n");
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BUG();
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}
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skb_queue_tail(&local->reject_queue, skb);
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rxrpc_queue_work(&local->rejecter);
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}
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/*
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* reject packets through the local endpoint
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*/
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void rxrpc_reject_packets(struct work_struct *work)
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{
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union {
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struct sockaddr sa;
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struct sockaddr_in sin;
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} sa;
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struct rxrpc_skb_priv *sp;
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struct rxrpc_header hdr;
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struct rxrpc_local *local;
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struct sk_buff *skb;
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struct msghdr msg;
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struct kvec iov[2];
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size_t size;
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__be32 code;
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local = container_of(work, struct rxrpc_local, rejecter);
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rxrpc_get_local(local);
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_enter("%d", local->debug_id);
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iov[0].iov_base = &hdr;
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iov[0].iov_len = sizeof(hdr);
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iov[1].iov_base = &code;
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iov[1].iov_len = sizeof(code);
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size = sizeof(hdr) + sizeof(code);
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msg.msg_name = &sa;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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memset(&sa, 0, sizeof(sa));
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sa.sa.sa_family = local->srx.transport.family;
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switch (sa.sa.sa_family) {
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case AF_INET:
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msg.msg_namelen = sizeof(sa.sin);
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break;
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default:
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msg.msg_namelen = 0;
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break;
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}
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memset(&hdr, 0, sizeof(hdr));
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hdr.type = RXRPC_PACKET_TYPE_ABORT;
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while ((skb = skb_dequeue(&local->reject_queue))) {
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sp = rxrpc_skb(skb);
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switch (sa.sa.sa_family) {
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case AF_INET:
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sa.sin.sin_port = udp_hdr(skb)->source;
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sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
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code = htonl(skb->priority);
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hdr.epoch = sp->hdr.epoch;
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hdr.cid = sp->hdr.cid;
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hdr.callNumber = sp->hdr.callNumber;
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hdr.serviceId = sp->hdr.serviceId;
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hdr.flags = sp->hdr.flags;
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hdr.flags ^= RXRPC_CLIENT_INITIATED;
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hdr.flags &= RXRPC_CLIENT_INITIATED;
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kernel_sendmsg(local->socket, &msg, iov, 2, size);
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break;
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default:
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break;
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}
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rxrpc_free_skb(skb);
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rxrpc_put_local(local);
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}
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rxrpc_put_local(local);
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_leave("");
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}
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