1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/in.h>
#include <ipxe/iobuf.h>
#include <ipxe/tcpip.h>
#include <ipxe/icmpv6.h>
/** @file
*
* ICMPv6 protocol
*
*/
/**
* Process received ICMPv6 echo request packet
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v sin6_src Source socket address
* @v sin6_dest Destination socket address
* @ret rc Return status code
*/
static int icmpv6_rx_echo ( struct io_buffer *iobuf,
struct net_device *netdev,
struct sockaddr_in6 *sin6_src,
struct sockaddr_in6 *sin6_dest __unused ) {
struct sockaddr_tcpip *st_src =
( ( struct sockaddr_tcpip * ) sin6_src );
struct icmpv6_echo *echo = iobuf->data;
size_t len = iob_len ( iobuf );
int rc;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *echo ) ) {
DBGC ( netdev, "ICMPv6 echo request too short at %zd bytes "
"(min %zd bytes)\n", iob_len ( iobuf ),
sizeof ( *echo ) );
rc = -EINVAL;
goto done;
}
DBGC ( netdev, "ICMPv6 echo request from %s (id %#04x seq %#04x)\n",
inet6_ntoa ( &sin6_dest->sin6_addr ), ntohs ( echo->ident ),
ntohs ( echo->sequence ) );
/* Convert echo request to echo reply and recalculate checksum */
echo->icmp.type = ICMPV6_ECHO_REPLY;
echo->icmp.chksum = 0;
echo->icmp.chksum = tcpip_chksum ( echo, len );
/* Transmit echo reply */
if ( ( rc = tcpip_tx ( iob_disown ( iobuf ), &icmpv6_protocol, NULL,
st_src, netdev, &echo->icmp.chksum ) ) != 0 ) {
DBGC ( netdev, "ICMPv6 could not transmit reply: %s\n",
strerror ( rc ) );
goto done;
}
done:
free_iob ( iobuf );
return rc;
}
/** ICMPv6 echo request handlers */
struct icmpv6_handler icmpv6_echo_handler __icmpv6_handler = {
.type = ICMPV6_ECHO_REQUEST,
.rx = icmpv6_rx_echo,
};
/**
* Identify ICMPv6 handler
*
* @v type ICMPv6 type
* @ret handler ICMPv6 handler, or NULL if not found
*/
static struct icmpv6_handler * icmpv6_handler ( unsigned int type ) {
struct icmpv6_handler *handler;
for_each_table_entry ( handler, ICMPV6_HANDLERS ) {
if ( handler->type == type )
return handler;
}
return NULL;
}
/**
* Process a received packet
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v st_src Partially-filled source address
* @v st_dest Partially-filled destination address
* @v pshdr_csum Pseudo-header checksum
* @ret rc Return status code
*/
static int icmpv6_rx ( struct io_buffer *iobuf, struct net_device *netdev,
struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum ) {
struct sockaddr_in6 *sin6_src = ( ( struct sockaddr_in6 * ) st_src );
struct sockaddr_in6 *sin6_dest = ( ( struct sockaddr_in6 * ) st_dest );
struct icmpv6_header *icmp = iobuf->data;
size_t len = iob_len ( iobuf );
struct icmpv6_handler *handler;
unsigned int csum;
int rc;
/* Sanity check */
if ( len < sizeof ( *icmp ) ) {
DBGC ( netdev, "ICMPv6 packet too short at %zd bytes (min %zd "
"bytes)\n", len, sizeof ( *icmp ) );
rc = -EINVAL;
goto done;
}
/* Verify checksum */
csum = tcpip_continue_chksum ( pshdr_csum, icmp, len );
if ( csum != 0 ) {
DBGC ( netdev, "ICMPv6 checksum incorrect (is %04x, should be "
"0000)\n", csum );
DBGC_HDA ( netdev, 0, icmp, len );
rc = -EINVAL;
goto done;
}
/* Identify handler */
handler = icmpv6_handler ( icmp->type );
if ( ! handler ) {
DBGC ( netdev, "ICMPv6 unrecognised type %d\n", icmp->type );
rc = -ENOTSUP;
goto done;
}
/* Pass to handler */
if ( ( rc = handler->rx ( iob_disown ( iobuf ), netdev, sin6_src,
sin6_dest ) ) != 0 ) {
DBGC ( netdev, "ICMPv6 could not handle type %d: %s\n",
icmp->type, strerror ( rc ) );
goto done;
}
done:
free_iob ( iobuf );
return rc;
}
/** ICMPv6 TCP/IP protocol */
struct tcpip_protocol icmpv6_protocol __tcpip_protocol = {
.name = "ICMPv6",
.rx = icmpv6_rx,
.tcpip_proto = IP_ICMP6,
};
|