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v1.20.1
src/net/ping.c
277 строк
7 KB
Michael Brown
[legal] Relicense files under GPL2_OR_LATER_OR_UBDL
02 мар 2015, 17:17
02 мар 2015, 17:17
b6ee89f
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/* * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>. * * 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 any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. * * You can also choose to distribute this program under the terms of * the Unmodified Binary Distribution Licence (as given in the file * COPYING.UBDL), provided that you have satisfied its requirements. */ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <stdlib.h> #include <string.h> #include <errno.h> #include <byteswap.h> #include <ipxe/refcnt.h> #include <ipxe/list.h> #include <ipxe/iobuf.h> #include <ipxe/tcpip.h> #include <ipxe/icmp.h> #include <ipxe/interface.h> #include <ipxe/xfer.h> #include <ipxe/open.h> #include <ipxe/netdevice.h> #include <ipxe/ping.h> /** @file * * ICMP ping protocol * */ /** * A ping connection * */ struct ping_connection { /** Reference counter */ struct refcnt refcnt; /** List of ping connections */ struct list_head list; /** Remote socket address */ struct sockaddr_tcpip peer; /** Local port number */ uint16_t port; /** Data transfer interface */ struct interface xfer; }; /** List of registered ping connections */ static LIST_HEAD ( ping_conns ); /** * Identify ping connection by local port number * * @v port Local port number * @ret ping Ping connection, or NULL */ static struct ping_connection * ping_demux ( unsigned int port ) { struct ping_connection *ping; list_for_each_entry ( ping, &ping_conns, list ) { if ( ping->port == port ) return ping; } return NULL; } /** * Check if local port number is available * * @v port Local port number * @ret port Local port number, or negative error */ static int ping_port_available ( int port ) { return ( ping_demux ( port ) ? -EADDRINUSE : port ); } /** * Process ICMP ping reply * * @v iobuf I/O buffer * @v st_src Source address * @ret rc Return status code */ int ping_rx ( struct io_buffer *iobuf, struct sockaddr_tcpip *st_src ) { struct icmp_echo *echo = iobuf->data; struct ping_connection *ping; struct xfer_metadata meta; int rc; /* Sanity check: should already have been checked by ICMP layer */ assert ( iob_len ( iobuf ) >= sizeof ( *echo ) ); /* Identify connection */ ping = ping_demux ( ntohs ( echo->ident ) ); DBGC ( ping, "PING %p reply id %#04x seq %#04x\n", ping, ntohs ( echo->ident ), ntohs ( echo->sequence ) ); if ( ! ping ) { rc = -ENOTCONN; goto discard; } /* Strip header, construct metadata, and pass data to upper layer */ iob_pull ( iobuf, sizeof ( *echo ) ); memset ( &meta, 0, sizeof ( meta ) ); meta.src = ( ( struct sockaddr * ) st_src ); meta.flags = XFER_FL_ABS_OFFSET; meta.offset = ntohs ( echo->sequence ); return xfer_deliver ( &ping->xfer, iob_disown ( iobuf ), &meta ); discard: free_iob ( iobuf ); return rc; } /** * Allocate I/O buffer for ping * * @v ping Ping connection * @v len Payload size * @ret iobuf I/O buffer, or NULL */ static struct io_buffer * ping_alloc_iob ( struct ping_connection *ping __unused, size_t len ) { size_t header_len; struct io_buffer *iobuf; header_len = ( MAX_LL_NET_HEADER_LEN + sizeof ( struct icmp_echo ) ); iobuf = alloc_iob ( header_len + len ); if ( iobuf ) iob_reserve ( iobuf, header_len ); return iobuf; } /** * Deliver datagram as I/O buffer * * @v ping Ping connection * @v iobuf I/O buffer * @v meta Data transfer metadata * @ret rc Return status code */ static int ping_deliver ( struct ping_connection *ping, struct io_buffer *iobuf, struct xfer_metadata *meta ) { struct icmp_echo *echo = iob_push ( iobuf, sizeof ( *echo ) ); int rc; /* Construct header */ memset ( echo, 0, sizeof ( *echo ) ); echo->ident = htons ( ping->port ); echo->sequence = htons ( meta->offset ); /* Transmit echo request */ if ( ( rc = icmp_tx_echo_request ( iob_disown ( iobuf ), &ping->peer ) ) != 0 ) { DBGC ( ping, "PING %p could not transmit: %s\n", ping, strerror ( rc ) ); return rc; } return 0; } /** * Close ping connection * * @v ping Ping connection * @v rc Reason for close */ static void ping_close ( struct ping_connection *ping, int rc ) { /* Close data transfer interface */ intf_shutdown ( &ping->xfer, rc ); /* Remove from list of connections and drop list's reference */ list_del ( &ping->list ); ref_put ( &ping->refcnt ); DBGC ( ping, "PING %p closed\n", ping ); } /** Ping data transfer interface operations */ static struct interface_operation ping_xfer_operations[] = { INTF_OP ( xfer_deliver, struct ping_connection *, ping_deliver ), INTF_OP ( xfer_alloc_iob, struct ping_connection *, ping_alloc_iob ), INTF_OP ( intf_close, struct ping_connection *, ping_close ), }; /** Ping data transfer interface descriptor */ static struct interface_descriptor ping_xfer_desc = INTF_DESC ( struct ping_connection, xfer, ping_xfer_operations ); /** * Open a ping connection * * @v xfer Data transfer interface * @v peer Peer socket address * @v local Local socket address, or NULL * @ret rc Return status code */ static int ping_open ( struct interface *xfer, struct sockaddr *peer, struct sockaddr *local ) { struct sockaddr_tcpip *st_peer = ( struct sockaddr_tcpip * ) peer; struct sockaddr_tcpip *st_local = ( struct sockaddr_tcpip * ) local; struct ping_connection *ping; int port; int rc; /* Allocate and initialise structure */ ping = zalloc ( sizeof ( *ping ) ); if ( ! ping ) { rc = -ENOMEM; goto err_alloc; } DBGC ( ping, "PING %p allocated\n", ping ); ref_init ( &ping->refcnt, NULL ); intf_init ( &ping->xfer, &ping_xfer_desc, &ping->refcnt ); memcpy ( &ping->peer, st_peer, sizeof ( ping->peer ) ); /* Bind to local port */ port = tcpip_bind ( st_local, ping_port_available ); if ( port < 0 ) { rc = port; DBGC ( ping, "PING %p could not bind: %s\n", ping, strerror ( rc ) ); goto err_bind; } ping->port = port; DBGC ( ping, "PING %p bound to id %#04x\n", ping, port ); /* Attach parent interface, transfer reference to connection * list, and return */ intf_plug_plug ( &ping->xfer, xfer ); list_add ( &ping->list, &ping_conns ); return 0; err_bind: ref_put ( &ping->refcnt ); err_alloc: return rc; } /** Ping IPv4 socket opener */ struct socket_opener ping_ipv4_socket_opener __socket_opener = { .semantics = PING_SOCK_ECHO, .family = AF_INET, .open = ping_open, }; /** Ping IPv6 socket opener */ struct socket_opener ping_ipv6_socket_opener __socket_opener = { .semantics = PING_SOCK_ECHO, .family = AF_INET6, .open = ping_open, }; /** Linkage hack */ int ping_sock_echo = PING_SOCK_ECHO;