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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/*
* (c) BayCom GmbH, http://www.baycom.de, info@baycom.de
*
* See the COPYING file for copyright information and
* how to reach the author.
*
*/
#include "headers.h"
struct conf *g_conf=NULL;
//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
#ifdef DEBUG
struct lookup icmpv6_types[] = {
{ICMP6_DST_UNREACH, "Destination Unreachable"},
{ICMP6_PACKET_TOO_BIG, "Packet too big"},
{ICMP6_TIME_EXCEEDED, "Time Exceeded"},
{ICMP6_PARAM_PROB, "Parameter Problem"},
{ICMP6_ECHO_REQUEST, "Echo Request"},
{ICMP6_ECHO_REPLY, "Echo Reply"},
{ICMP6_MEMBERSHIP_QUERY, "Membership Query"},
{ICMP6_MEMBERSHIP_REPORT, "Membership Report"},
{ICMP6_MEMBERSHIP_REDUCTION, "Membership Reduction"},
{ICMP6_V2_MEMBERSHIP_REPORT, "Membership Report (V2)"},
{ICMP6_V2_MEMBERSHIP_REPORT_EXP, "Membership Report (V2) - Experimental"},
{ND_ROUTER_SOLICIT, "ND Router Solicitation"},
{ND_ROUTER_ADVERT, "ND Router Advertisement"},
{ND_NEIGHBOR_SOLICIT, "ND Neighbour Solicitation"},
{ND_NEIGHBOR_ADVERT, "ND Neighbour Advertisement"},
{ND_REDIRECT, "ND Redirect"},
{ICMP6_ROUTER_RENUMBERING, "Router Renumbering",},
{ICMP6_NI_QUERY, "Node Information Query"},
{ICMP6_NI_REPLY, "Node Information Reply"},
{MLD_MTRACE_RESP, "Mtrace Response"},
{MLD_MTRACE, "Mtrace Message"},
{0, NULL},
}, icmpv6_codes_unreach[] = {
{ICMP6_DST_UNREACH_NOROUTE, "No route to destination"},
{ICMP6_DST_UNREACH_ADMIN, "Administratively prohibited"},
{ICMP6_DST_UNREACH_NOTNEIGHBOR, "Not a neighbor (obsolete)"},
{ICMP6_DST_UNREACH_BEYONDSCOPE, "Beyond scope of source address"},
{ICMP6_DST_UNREACH_ADDR, "Address Unreachable"},
{ICMP6_DST_UNREACH_NOPORT, "Port Unreachable"},
}, icmpv6_codes_ttl[] = {
{ICMP6_TIME_EXCEED_TRANSIT, "Time Exceeded during Transit",},
{ICMP6_TIME_EXCEED_REASSEMBLY, "Time Exceeded during Reassembly"},
}, icmpv6_codes_param[] = {
{ICMP6_PARAMPROB_HEADER, "Erroneous Header Field"},
{ICMP6_PARAMPROB_NEXTHEADER, "Unrecognized Next Header"},
{ICMP6_PARAMPROB_OPTION, "Unrecognized Option"},
}, icmpv6_codes_ni[] = {
{ICMP6_NI_SUCCESS, "Node Information Successful Reply"},
{ICMP6_NI_REFUSED, "Node Information Request Is Refused"},
{ICMP6_NI_UNKNOWN, "Unknown Qtype"},
}, icmpv6_codes_renumber[] = {
{ICMP6_ROUTER_RENUMBERING_COMMAND, "Router Renumbering Command"},
{ICMP6_ROUTER_RENUMBERING_RESULT, "Router Renumbering Result"},
{ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET, "Router Renumbering Sequence Number Reset"},
}, mld2_grec_types[] = {
{MLD2_MODE_IS_INCLUDE, "MLDv2 Mode Is Include"},
{MLD2_MODE_IS_EXCLUDE, "MLDv2 Mode Is Exclude"},
{MLD2_CHANGE_TO_INCLUDE, "MLDv2 Change to Include"},
{MLD2_CHANGE_TO_EXCLUDE, "MLDv2 Change to Exclude"},
{MLD2_ALLOW_NEW_SOURCES, "MLDv2 Allow New Source"},
{MLD2_BLOCK_OLD_SOURCES, "MLDv2 Block Old Sources"},
};
#endif
//----------------------------------------------------------------------------------------------------------------
const char *lookup (struct lookup *l, unsigned int num)
{
unsigned int i;
for (i = 0; l && l[i].desc; i++) {
if (l[i].num != num)
continue;
return l[i].desc;
}
return "Unknown";
}
const char *icmpv6_type (unsigned int type)
{
#ifdef DEBUG
return lookup (icmpv6_types, type);
#else
return "";
#endif
}
const char *icmpv6_code (unsigned int type, unsigned int code)
{
#ifdef DEBUG
struct lookup *l = NULL;
switch (type) {
case ICMP6_DST_UNREACH:
l = icmpv6_codes_unreach;
break;
case ICMP6_TIME_EXCEEDED:
l = icmpv6_codes_ttl;
break;
case ICMP6_PARAM_PROB:
l = icmpv6_codes_param;
break;
case ICMP6_NI_QUERY:
case ICMP6_NI_REPLY:
l = icmpv6_codes_ni;
break;
case ICMP6_ROUTER_RENUMBERING:
l = icmpv6_codes_renumber;
break;
}
return lookup (l, code);
#else
return "";
#endif
}
//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
uint16_t inchksum (const void *data, uint32_t length)
{
register long sum = 0;
register const uint16_t *wrd = (const uint16_t *) data;
register long slen = (long) length;
while (slen >= 2) {
sum += *wrd++;
slen -= 2;
}
if (slen > 0)
sum += *(const uint8_t *) wrd;
while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);
return (uint16_t) sum;
}
//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
uint16_t ipv6_checksum (const struct ip6_hdr * ip6, uint8_t protocol, const void *data, const uint16_t length)
{
struct
{
uint16_t length;
uint16_t zero1;
uint8_t zero2;
uint8_t next;
} pseudo;
register uint32_t chksum = 0;
pseudo.length = htons (length);
pseudo.zero1 = 0;
pseudo.zero2 = 0;
pseudo.next = protocol;
/* IPv6 Source + Dest */
chksum = inchksum (&ip6->ip6_src, sizeof (ip6->ip6_src) + sizeof (ip6->ip6_dst));
chksum += inchksum (&pseudo, sizeof (pseudo));
chksum += inchksum (data, length);
/* Wrap in the carries to reduce chksum to 16 bits. */
chksum = (chksum >> 16) + (chksum & 0xffff);
chksum += (chksum >> 16);
/* Take ones-complement and replace 0 with 0xFFFF. */
chksum = (uint16_t) ~ chksum;
if (chksum == 0UL)
chksum = 0xffffUL;
return (uint16_t) chksum;
}
//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
void sendpacket6 (struct intnode *intn, const struct ip6_hdr *iph, const uint16_t len)
{
int sent;
#if ! (defined WIN32 || defined APPLE)
struct sockaddr_ll sa;
memset (&sa, 0, sizeof (sa));
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons (ETH_P_IPV6);
sa.sll_ifindex = intn->ifindex;
sa.sll_hatype = intn->hwaddr.sa_family;
sa.sll_pkttype = 0;
sa.sll_halen = 6;
/*
* Construct a Ethernet MAC address from the IPv6 destination multicast address.
* Per RFC2464
*/
sa.sll_addr[0] = 0x33;
sa.sll_addr[1] = 0x33;
sa.sll_addr[2] = iph->ip6_dst.s6_addr[12];
sa.sll_addr[3] = iph->ip6_dst.s6_addr[13];
sa.sll_addr[4] = iph->ip6_dst.s6_addr[14];
sa.sll_addr[5] = iph->ip6_dst.s6_addr[15];
/* Send the packet */
errno = 0;
#else
// info("Send on Interface %s@%d len:%d\n",intn->name, intn->ifindex, len);
struct sockaddr_in6 sa;
memset (&sa, 0, sizeof (sa));
sa.sin6_family = AF_INET6;
sa.sin6_addr = iph->ip6_dst;
#endif
#ifdef APPLE
unsigned char *x=(unsigned char *)iph;
sent = sendto (g_conf->rawsocket, (_SOTYPE)x+40, len-40, 0, (struct sockaddr *) &sa, sizeof (sa));
#else
sent = sendto (g_conf->rawsocket, (_SOTYPE)iph, len, 0, (struct sockaddr *) &sa, sizeof (sa));
#endif
if (sent < 0) {
/*
* Remove the device if it doesn't exist anymore,
* can happen with dynamic tunnels etc
*/
if (errno == ENXIO) {
warn ("Cannot send %u bytes on interface %s received ENXIO, interface %u no longer usable\n", len, intn->name, intn->ifindex);
/* Destroy the interface itself */
int_destroy (intn);
} else
warn ("Cannot send %u bytes on interface %s (%d) failed with a mtu of %u: %s (errno %d)\n", len, intn->name, intn->ifindex, intn->mtu, strerror (errno), errno);
return;
}
/* Update the global statistics */
g_conf->stat_packets_sent++;
g_conf->stat_bytes_sent += len;
/* Update interface statistics */
intn->stat_bytes_sent += len;
intn->stat_packets_sent++;
return;
}
|
