[infiniband] Allow for the creation of multicast groups
[ipxe.git] / src / net / icmpv4.c
1 /*
2 * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA.
18 *
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
22 */
23
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25
26 #include <string.h>
27 #include <errno.h>
28 #include <ipxe/iobuf.h>
29 #include <ipxe/in.h>
30 #include <ipxe/tcpip.h>
31 #include <ipxe/icmp.h>
32
33 /** @file
34 *
35 * ICMPv4 protocol
36 *
37 */
38
39 struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol;
40
41 /**
42 * Process a received packet
43 *
44 * @v iobuf I/O buffer
45 * @v netdev Network device
46 * @v st_src Partially-filled source address
47 * @v st_dest Partially-filled destination address
48 * @v pshdr_csum Pseudo-header checksum
49 * @ret rc Return status code
50 */
51 static int icmpv4_rx ( struct io_buffer *iobuf,
52 struct net_device *netdev __unused,
53 struct sockaddr_tcpip *st_src,
54 struct sockaddr_tcpip *st_dest __unused,
55 uint16_t pshdr_csum __unused ) {
56 struct icmp_header *icmp = iobuf->data;
57 size_t len = iob_len ( iobuf );
58 unsigned int csum;
59 unsigned int type;
60 int rc;
61
62 /* Sanity check */
63 if ( len < sizeof ( *icmp ) ) {
64 DBG ( "ICMP packet too short at %zd bytes (min %zd bytes)\n",
65 len, sizeof ( *icmp ) );
66 rc = -EINVAL;
67 goto discard;
68 }
69
70 /* Verify checksum */
71 csum = tcpip_chksum ( icmp, len );
72 if ( csum != 0 ) {
73 DBG ( "ICMP checksum incorrect (is %04x, should be 0000)\n",
74 csum );
75 DBG_HD ( icmp, len );
76 rc = -EINVAL;
77 goto discard;
78 }
79
80 /* Handle ICMP packet */
81 type = icmp->type;
82 switch ( type ) {
83 case ICMP_ECHO_REQUEST:
84 return icmp_rx_echo_request ( iobuf, st_src,
85 &icmpv4_echo_protocol );
86 case ICMP_ECHO_REPLY:
87 return icmp_rx_echo_reply ( iobuf, st_src );
88 default:
89 DBG ( "ICMP ignoring type %d\n", type );
90 rc = 0;
91 break;
92 }
93
94 discard:
95 free_iob ( iobuf );
96 return rc;
97 }
98
99 /** ICMPv4 TCP/IP protocol */
100 struct tcpip_protocol icmpv4_protocol __tcpip_protocol = {
101 .name = "ICMPv4",
102 .rx = icmpv4_rx,
103 .tcpip_proto = IP_ICMP,
104 };
105
106 /** ICMPv4 echo protocol */
107 struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol = {
108 .family = AF_INET,
109 .request = ICMP_ECHO_REQUEST,
110 .reply = ICMP_ECHO_REPLY,
111 .tcpip_protocol = &icmpv4_protocol,
112 .net_checksum = 0,
113 };