cregit-Linux how code gets into the kernel

Release 4.11 net/rxrpc/conn_event.c

Directory: net/rxrpc
/* 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 <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); pkt.whdr.flags |= RXRPC_SLOW_START_OK; 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: trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0, RXRPC_ACK_DUPLICATE, 0); _proto("Tx ACK %%%u [re]", serial); break; } kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len); _leave(""); return; }

Contributors

PersonTokensPropCommitsCommitProp
David Howells646100.00%5100.00%
Total646100.00%5100.00%

/* * 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; int i; _enter("{%d},%x", conn->debug_id, abort_code); 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) { if (compl == RXRPC_CALL_LOCALLY_ABORTED) trace_rxrpc_abort("CON", call->cid, call->call_id, 0, abort_code, error); if (rxrpc_set_call_completion(call, compl, abort_code, error)) rxrpc_notify_socket(call); } } spin_unlock(&conn->channel_lock); _leave(""); }

Contributors

PersonTokensPropCommitsCommitProp
David Howells147100.00%6100.00%
Total147100.00%6100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
David Howells397100.00%7100.00%
Total397100.00%7100.00%

/* * mark a call as being on a now-secured channel * - must be called with BH's disabled. */
static void rxrpc_call_is_secure(struct rxrpc_call *call) { _enter("%p", call); if (call) { write_lock_bh(&call->state_lock); if (call->state == RXRPC_CALL_SERVER_SECURING) { call->state = RXRPC_CALL_SERVER_ACCEPTING; rxrpc_notify_socket(call); } write_unlock_bh(&call->state_lock); } }

Contributors

PersonTokensPropCommitsCommitProp
David Howells6098.36%266.67%
Roel Kluin11.64%133.33%
Total61100.00%3100.00%

/* * 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) { _leave(" = -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_BUSY: /* Just ignore BUSY packets for now. */ return 0; case RXRPC_PACKET_TYPE_ABORT: if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), &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, RXRPC_CALL_REMOTELY_ABORTED, abort_code, ECONNABORTED); 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; spin_unlock(&conn->state_lock); for (loop = 0; loop < RXRPC_MAXCALLS; loop++) rxrpc_call_is_secure( rcu_dereference_protected( conn->channels[loop].call, lockdep_is_held(&conn->channel_lock))); } else { spin_unlock(&conn->state_lock); } spin_unlock(&conn->channel_lock); return 0; default: _leave(" = -EPROTO [%u]", sp->hdr.type); return -EPROTO; } }

Contributors

PersonTokensPropCommitsCommitProp
David Howells37697.16%1191.67%
Herbert Xu112.84%18.33%
Total387100.00%12100.00%

/* * 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]"); }

Contributors

PersonTokensPropCommitsCommitProp
David Howells146100.00%2100.00%
Total146100.00%2100.00%

/* * 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; rxrpc_see_connection(conn); 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, rxrpc_skb_rx_seen); 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, rxrpc_skb_rx_freed); 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, rxrpc_skb_rx_freed); _leave(" [EPROTO]"); goto out; }

Contributors

PersonTokensPropCommitsCommitProp
David Howells199100.00%5100.00%
Total199100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
David Howells200399.06%2388.46%
Herbert Xu110.54%13.85%
Joe Perches70.35%13.85%
Roel Kluin10.05%13.85%
Total2022100.00%26100.00%
Directory: net/rxrpc
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.