515 lines
12 KiB
C
515 lines
12 KiB
C
/* connection-level event handling
|
|
*
|
|
* Copyright (C) 2007 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.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/net.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/errqueue.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/in.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/icmp.h>
|
|
#include <net/sock.h>
|
|
#include <net/af_rxrpc.h>
|
|
#include <net/ip.h>
|
|
#include "ar-internal.h"
|
|
|
|
/*
|
|
* Retransmit terminal ACK or ABORT of the previous call.
|
|
*/
|
|
static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
|
|
struct rxrpc_channel *chan;
|
|
struct msghdr msg;
|
|
struct kvec iov;
|
|
struct {
|
|
struct rxrpc_wire_header whdr;
|
|
union {
|
|
struct {
|
|
__be32 code;
|
|
} abort;
|
|
struct {
|
|
struct rxrpc_ackpacket ack;
|
|
u8 padding[3];
|
|
struct rxrpc_ackinfo info;
|
|
};
|
|
};
|
|
} __attribute__((packed)) pkt;
|
|
size_t len;
|
|
u32 serial, mtu, call_id;
|
|
|
|
_enter("%d", conn->debug_id);
|
|
|
|
chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
|
|
|
|
/* If the last call got moved on whilst we were waiting to run, just
|
|
* ignore this packet.
|
|
*/
|
|
call_id = READ_ONCE(chan->last_call);
|
|
/* Sync with __rxrpc_disconnect_call() */
|
|
smp_rmb();
|
|
if (call_id != sp->hdr.callNumber)
|
|
return;
|
|
|
|
msg.msg_name = &conn->params.peer->srx.transport;
|
|
msg.msg_namelen = conn->params.peer->srx.transport_len;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
pkt.whdr.epoch = htonl(sp->hdr.epoch);
|
|
pkt.whdr.cid = htonl(sp->hdr.cid);
|
|
pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
|
|
pkt.whdr.seq = 0;
|
|
pkt.whdr.type = chan->last_type;
|
|
pkt.whdr.flags = conn->out_clientflag;
|
|
pkt.whdr.userStatus = 0;
|
|
pkt.whdr.securityIndex = conn->security_ix;
|
|
pkt.whdr._rsvd = 0;
|
|
pkt.whdr.serviceId = htons(chan->last_service_id);
|
|
|
|
len = sizeof(pkt.whdr);
|
|
switch (chan->last_type) {
|
|
case RXRPC_PACKET_TYPE_ABORT:
|
|
pkt.abort.code = htonl(chan->last_abort);
|
|
len += sizeof(pkt.abort);
|
|
break;
|
|
|
|
case RXRPC_PACKET_TYPE_ACK:
|
|
mtu = conn->params.peer->if_mtu;
|
|
mtu -= conn->params.peer->hdrsize;
|
|
pkt.ack.bufferSpace = 0;
|
|
pkt.ack.maxSkew = htons(skb->priority);
|
|
pkt.ack.firstPacket = htonl(chan->last_seq);
|
|
pkt.ack.previousPacket = htonl(chan->last_seq - 1);
|
|
pkt.ack.serial = htonl(sp->hdr.serial);
|
|
pkt.ack.reason = RXRPC_ACK_DUPLICATE;
|
|
pkt.ack.nAcks = 0;
|
|
pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
|
|
pkt.info.maxMTU = htonl(mtu);
|
|
pkt.info.rwind = htonl(rxrpc_rx_window_size);
|
|
pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
|
|
len += sizeof(pkt.ack) + sizeof(pkt.info);
|
|
break;
|
|
}
|
|
|
|
/* Resync with __rxrpc_disconnect_call() and check that the last call
|
|
* didn't get advanced whilst we were filling out the packets.
|
|
*/
|
|
smp_rmb();
|
|
if (READ_ONCE(chan->last_call) != call_id)
|
|
return;
|
|
|
|
iov.iov_base = &pkt;
|
|
iov.iov_len = len;
|
|
|
|
serial = atomic_inc_return(&conn->serial);
|
|
pkt.whdr.serial = htonl(serial);
|
|
|
|
switch (chan->last_type) {
|
|
case RXRPC_PACKET_TYPE_ABORT:
|
|
_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
|
|
break;
|
|
case RXRPC_PACKET_TYPE_ACK:
|
|
_proto("Tx ACK %%%u [re]", serial);
|
|
break;
|
|
}
|
|
|
|
kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
|
|
_leave("");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* pass a connection-level abort onto all calls on that connection
|
|
*/
|
|
static void rxrpc_abort_calls(struct rxrpc_connection *conn,
|
|
enum rxrpc_call_completion compl,
|
|
u32 abort_code, int error)
|
|
{
|
|
struct rxrpc_call *call;
|
|
bool queue;
|
|
int i, bit;
|
|
|
|
_enter("{%d},%x", conn->debug_id, abort_code);
|
|
|
|
if (compl == RXRPC_CALL_LOCALLY_ABORTED)
|
|
bit = RXRPC_CALL_EV_CONN_ABORT;
|
|
else
|
|
bit = RXRPC_CALL_EV_RCVD_ABORT;
|
|
|
|
spin_lock(&conn->channel_lock);
|
|
|
|
for (i = 0; i < RXRPC_MAXCALLS; i++) {
|
|
call = rcu_dereference_protected(
|
|
conn->channels[i].call,
|
|
lockdep_is_held(&conn->channel_lock));
|
|
if (call) {
|
|
rxrpc_see_call(call);
|
|
write_lock_bh(&call->state_lock);
|
|
if (rxrpc_set_call_completion(call, compl, abort_code,
|
|
error)) {
|
|
set_bit(bit, &call->events);
|
|
queue = true;
|
|
}
|
|
write_unlock_bh(&call->state_lock);
|
|
if (queue)
|
|
rxrpc_queue_call(call);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&conn->channel_lock);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* generate a connection-level abort
|
|
*/
|
|
static int rxrpc_abort_connection(struct rxrpc_connection *conn,
|
|
u32 error, u32 abort_code)
|
|
{
|
|
struct rxrpc_wire_header whdr;
|
|
struct msghdr msg;
|
|
struct kvec iov[2];
|
|
__be32 word;
|
|
size_t len;
|
|
u32 serial;
|
|
int ret;
|
|
|
|
_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
|
|
|
|
/* generate a connection-level abort */
|
|
spin_lock_bh(&conn->state_lock);
|
|
if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
|
|
spin_unlock_bh(&conn->state_lock);
|
|
_leave(" = 0 [already dead]");
|
|
return 0;
|
|
}
|
|
|
|
conn->state = RXRPC_CONN_LOCALLY_ABORTED;
|
|
spin_unlock_bh(&conn->state_lock);
|
|
|
|
rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
|
|
|
|
msg.msg_name = &conn->params.peer->srx.transport;
|
|
msg.msg_namelen = conn->params.peer->srx.transport_len;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
whdr.epoch = htonl(conn->proto.epoch);
|
|
whdr.cid = htonl(conn->proto.cid);
|
|
whdr.callNumber = 0;
|
|
whdr.seq = 0;
|
|
whdr.type = RXRPC_PACKET_TYPE_ABORT;
|
|
whdr.flags = conn->out_clientflag;
|
|
whdr.userStatus = 0;
|
|
whdr.securityIndex = conn->security_ix;
|
|
whdr._rsvd = 0;
|
|
whdr.serviceId = htons(conn->params.service_id);
|
|
|
|
word = htonl(conn->local_abort);
|
|
|
|
iov[0].iov_base = &whdr;
|
|
iov[0].iov_len = sizeof(whdr);
|
|
iov[1].iov_base = &word;
|
|
iov[1].iov_len = sizeof(word);
|
|
|
|
len = iov[0].iov_len + iov[1].iov_len;
|
|
|
|
serial = atomic_inc_return(&conn->serial);
|
|
whdr.serial = htonl(serial);
|
|
_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
|
|
|
|
ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
|
|
if (ret < 0) {
|
|
_debug("sendmsg failed: %d", ret);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
_leave(" = 0");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* mark a call as being on a now-secured channel
|
|
* - must be called with softirqs disabled
|
|
*/
|
|
static void rxrpc_call_is_secure(struct rxrpc_call *call)
|
|
{
|
|
_enter("%p", call);
|
|
if (call) {
|
|
read_lock(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_COMPLETE &&
|
|
!test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events))
|
|
rxrpc_queue_call(call);
|
|
read_unlock(&call->state_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* connection-level Rx packet processor
|
|
*/
|
|
static int rxrpc_process_event(struct rxrpc_connection *conn,
|
|
struct sk_buff *skb,
|
|
u32 *_abort_code)
|
|
{
|
|
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
|
|
__be32 wtmp;
|
|
u32 abort_code;
|
|
int loop, ret;
|
|
|
|
if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
|
|
kleave(" = -ECONNABORTED [%u]", conn->state);
|
|
return -ECONNABORTED;
|
|
}
|
|
|
|
_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
|
|
|
|
switch (sp->hdr.type) {
|
|
case RXRPC_PACKET_TYPE_DATA:
|
|
case RXRPC_PACKET_TYPE_ACK:
|
|
rxrpc_conn_retransmit_call(conn, skb);
|
|
return 0;
|
|
|
|
case RXRPC_PACKET_TYPE_ABORT:
|
|
if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
|
|
return -EPROTO;
|
|
abort_code = ntohl(wtmp);
|
|
_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
|
|
|
|
conn->state = RXRPC_CONN_REMOTELY_ABORTED;
|
|
rxrpc_abort_calls(conn, 0, RXRPC_CALL_REMOTELY_ABORTED,
|
|
abort_code);
|
|
return -ECONNABORTED;
|
|
|
|
case RXRPC_PACKET_TYPE_CHALLENGE:
|
|
return conn->security->respond_to_challenge(conn, skb,
|
|
_abort_code);
|
|
|
|
case RXRPC_PACKET_TYPE_RESPONSE:
|
|
ret = conn->security->verify_response(conn, skb, _abort_code);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = conn->security->init_connection_security(conn);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = conn->security->prime_packet_security(conn);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
spin_lock(&conn->channel_lock);
|
|
spin_lock(&conn->state_lock);
|
|
|
|
if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
|
|
conn->state = RXRPC_CONN_SERVICE;
|
|
for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
|
|
rxrpc_call_is_secure(
|
|
rcu_dereference_protected(
|
|
conn->channels[loop].call,
|
|
lockdep_is_held(&conn->channel_lock)));
|
|
}
|
|
|
|
spin_unlock(&conn->state_lock);
|
|
spin_unlock(&conn->channel_lock);
|
|
return 0;
|
|
|
|
default:
|
|
_leave(" = -EPROTO [%u]", sp->hdr.type);
|
|
return -EPROTO;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* set up security and issue a challenge
|
|
*/
|
|
static void rxrpc_secure_connection(struct rxrpc_connection *conn)
|
|
{
|
|
u32 abort_code;
|
|
int ret;
|
|
|
|
_enter("{%d}", conn->debug_id);
|
|
|
|
ASSERT(conn->security_ix != 0);
|
|
|
|
if (!conn->params.key) {
|
|
_debug("set up security");
|
|
ret = rxrpc_init_server_conn_security(conn);
|
|
switch (ret) {
|
|
case 0:
|
|
break;
|
|
case -ENOENT:
|
|
abort_code = RX_CALL_DEAD;
|
|
goto abort;
|
|
default:
|
|
abort_code = RXKADNOAUTH;
|
|
goto abort;
|
|
}
|
|
}
|
|
|
|
if (conn->security->issue_challenge(conn) < 0) {
|
|
abort_code = RX_CALL_DEAD;
|
|
ret = -ENOMEM;
|
|
goto abort;
|
|
}
|
|
|
|
_leave("");
|
|
return;
|
|
|
|
abort:
|
|
_debug("abort %d, %d", ret, abort_code);
|
|
rxrpc_abort_connection(conn, -ret, abort_code);
|
|
_leave(" [aborted]");
|
|
}
|
|
|
|
/*
|
|
* connection-level event processor
|
|
*/
|
|
void rxrpc_process_connection(struct work_struct *work)
|
|
{
|
|
struct rxrpc_connection *conn =
|
|
container_of(work, struct rxrpc_connection, processor);
|
|
struct sk_buff *skb;
|
|
u32 abort_code = RX_PROTOCOL_ERROR;
|
|
int ret;
|
|
|
|
_enter("{%d}", conn->debug_id);
|
|
|
|
if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
|
|
rxrpc_secure_connection(conn);
|
|
|
|
/* go through the conn-level event packets, releasing the ref on this
|
|
* connection that each one has when we've finished with it */
|
|
while ((skb = skb_dequeue(&conn->rx_queue))) {
|
|
rxrpc_see_skb(skb);
|
|
ret = rxrpc_process_event(conn, skb, &abort_code);
|
|
switch (ret) {
|
|
case -EPROTO:
|
|
case -EKEYEXPIRED:
|
|
case -EKEYREJECTED:
|
|
goto protocol_error;
|
|
case -EAGAIN:
|
|
goto requeue_and_leave;
|
|
case -ECONNABORTED:
|
|
default:
|
|
rxrpc_free_skb(skb);
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
rxrpc_put_connection(conn);
|
|
_leave("");
|
|
return;
|
|
|
|
requeue_and_leave:
|
|
skb_queue_head(&conn->rx_queue, skb);
|
|
goto out;
|
|
|
|
protocol_error:
|
|
if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
|
|
goto requeue_and_leave;
|
|
rxrpc_free_skb(skb);
|
|
_leave(" [EPROTO]");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* put a packet up for transport-level abort
|
|
*/
|
|
void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
|
|
{
|
|
CHECK_SLAB_OKAY(&local->usage);
|
|
|
|
skb_queue_tail(&local->reject_queue, skb);
|
|
rxrpc_queue_local(local);
|
|
}
|
|
|
|
/*
|
|
* reject packets through the local endpoint
|
|
*/
|
|
void rxrpc_reject_packets(struct rxrpc_local *local)
|
|
{
|
|
union {
|
|
struct sockaddr sa;
|
|
struct sockaddr_in sin;
|
|
} sa;
|
|
struct rxrpc_skb_priv *sp;
|
|
struct rxrpc_wire_header whdr;
|
|
struct sk_buff *skb;
|
|
struct msghdr msg;
|
|
struct kvec iov[2];
|
|
size_t size;
|
|
__be32 code;
|
|
|
|
_enter("%d", local->debug_id);
|
|
|
|
iov[0].iov_base = &whdr;
|
|
iov[0].iov_len = sizeof(whdr);
|
|
iov[1].iov_base = &code;
|
|
iov[1].iov_len = sizeof(code);
|
|
size = sizeof(whdr) + sizeof(code);
|
|
|
|
msg.msg_name = &sa;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa.sa_family = local->srx.transport.family;
|
|
switch (sa.sa.sa_family) {
|
|
case AF_INET:
|
|
msg.msg_namelen = sizeof(sa.sin);
|
|
break;
|
|
default:
|
|
msg.msg_namelen = 0;
|
|
break;
|
|
}
|
|
|
|
memset(&whdr, 0, sizeof(whdr));
|
|
whdr.type = RXRPC_PACKET_TYPE_ABORT;
|
|
|
|
while ((skb = skb_dequeue(&local->reject_queue))) {
|
|
rxrpc_see_skb(skb);
|
|
sp = rxrpc_skb(skb);
|
|
switch (sa.sa.sa_family) {
|
|
case AF_INET:
|
|
sa.sin.sin_port = udp_hdr(skb)->source;
|
|
sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
|
|
code = htonl(skb->priority);
|
|
|
|
whdr.epoch = htonl(sp->hdr.epoch);
|
|
whdr.cid = htonl(sp->hdr.cid);
|
|
whdr.callNumber = htonl(sp->hdr.callNumber);
|
|
whdr.serviceId = htons(sp->hdr.serviceId);
|
|
whdr.flags = sp->hdr.flags;
|
|
whdr.flags ^= RXRPC_CLIENT_INITIATED;
|
|
whdr.flags &= RXRPC_CLIENT_INITIATED;
|
|
|
|
kernel_sendmsg(local->socket, &msg, iov, 2, size);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
rxrpc_free_skb(skb);
|
|
}
|
|
|
|
_leave("");
|
|
}
|