/* Function Name: EIGRP packet header configuration.
Description: This function configures and sends the EIGRP packet header.
Targets: N/A */
int eigrp(const socket_t fd, const struct config_options *o)
{
size_t greoptlen, /* GRE options size. */
eigrp_tlv_len, /* EIGRP TLV size. */
packet_size,
offset,
counter;
in_addr_t dest; /* EIGRP Destination address */
uint32_t prefix; /* EIGRP Prefix */
/* Packet and Checksum. */
mptr_t buffer;
/* Socket address and IP header. */
struct sockaddr_in sin;
struct iphdr * ip;
/* EIGRP header. */
struct eigrp_hdr * eigrp;
assert(o != NULL);
greoptlen = gre_opt_len(o->gre.options, o->encapsulated);
prefix = __RND(o->eigrp.prefix);
eigrp_tlv_len = eigrp_hdr_len(o->eigrp.opcode, o->eigrp.type, prefix, o->eigrp.auth);
packet_size = sizeof(struct iphdr) +
greoptlen +
sizeof(struct eigrp_hdr) +
eigrp_tlv_len;
/* Try to reallocate packet, if necessary */
alloc_packet(packet_size);
/* IP Header structure making a pointer to Packet. */
ip = ip_header(packet, packet_size, o);
/* GRE Encapsulation takes place. */
gre_encapsulation(packet, o,
sizeof(struct iphdr) +
sizeof(struct eigrp_hdr) +
eigrp_tlv_len);
/*
* Please, be advised that there is no deep information about EIGRP, no
* other than EIGRP PCAP files public available. Due to that I have done
* a deep analysis using live EIGRP PCAP files to build the EIGRP Packet.
*
* There are some really good resources, such as:
* http://www.protocolbase.net/protocols/protocol_EIGRP.php
* http://packetlife.net/captures/category/cisco-proprietary/
* http://oreilly.com/catalog/iprouting/chapter/ch04.html
*
* EIGRP Header structure.
*/
eigrp = (struct eigrp_hdr *)((void *)ip + sizeof(struct iphdr) + greoptlen);
eigrp->version = o->eigrp.ver_minor ? o->eigrp.ver_minor : EIGRPVERSION;
eigrp->opcode = __RND(o->eigrp.opcode);
eigrp->flags = htonl(__RND(o->eigrp.flags));
eigrp->sequence = htonl(__RND(o->eigrp.sequence));
eigrp->acknowledge = o->eigrp.type == EIGRP_TYPE_SEQUENCE ?
htonl(__RND(o->eigrp.acknowledge)) : 0;
eigrp->as = htonl(__RND(o->eigrp.as));
eigrp->check = 0;
offset = sizeof(struct eigrp_hdr);
buffer.ptr = (void *)eigrp + offset;
/*
* Every live EIGRP PCAP file brings Authentication Data TLV first.
*
* The Authentication Data TVL must be used only in some cases:
* 1. IP Internal or External Routes TLV for Update
* 2. Software Version with Parameter TLVs for Hello
* 3. Next Multicast Sequence TLV for Hello
*/
if (o->eigrp.auth)
{
if (o->eigrp.opcode == EIGRP_OPCODE_UPDATE ||
(o->eigrp.opcode == EIGRP_OPCODE_HELLO &&
(o->eigrp.type == EIGRP_TYPE_MULTICAST ||
o->eigrp.type == EIGRP_TYPE_SOFTWARE)))
{
/* NOTE: stemp used to avoid multiple comparisons on loop below */
size_t stemp;
stemp = auth_hmac_md5_len(o->eigrp.auth);
/*
* Enhanced Interior Gateway Routing Protocol (EIGRP)
*
* Authentication Data TLV (EIGRP Type = 0x0002)
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length |
* +---------------------------------------------------------------+
* | Authentication Method | Authentication Key Size |
* +---------------------------------------------------------------+
* | Authentication Key ID |
* +---------------------------------------------------------------+
* | |
* + +
* | Padding (?) |
* + +
* | |
* +---------------------------------------------------------------+
* | |
* + +
* | Authentication Key Block |
* + (MD5 Digest) +
* | |
* + +
* | |
* +---------------------------------------------------------------+
*/
*buffer.word_ptr++ = htons(EIGRP_TYPE_AUTH);
*buffer.word_ptr++ = htons(o->eigrp.length ? o->eigrp.length : EIGRP_TLEN_AUTH);
*buffer.word_ptr++ = htons(AUTH_TYPE_HMACMD5);
*buffer.word_ptr++ = htons(stemp);
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.key_id));
for (counter = 0; counter < EIGRP_PADDING_BLOCK; counter++)
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
/*
* The Authentication key uses HMAC-MD5 or HMAC-SHA-1 digest.
*/
for (counter = 0; counter < stemp; counter++)
*buffer.byte_ptr++ = random();
/* FIXME: Is this correct?!
The code, above seems to use a variable size for digest (stemp)
and length (if o->eigrp_length != 0). */
offset += EIGRP_TLEN_AUTH;
}
}
/*
* AFAIK, there are differences when building the EIGRP packet for
* Update, Request, Query and Reply. Any EIGRP PCAP file I saw does
* not carry Paremeter, Software Version and/or Multicast Sequence,
* instead, it carries Authentication Data, IP Internal and External
* Routes or nothing (depends on the EIGRP Type).
*/
if (o->eigrp.opcode == EIGRP_OPCODE_UPDATE ||
o->eigrp.opcode == EIGRP_OPCODE_REQUEST ||
o->eigrp.opcode == EIGRP_OPCODE_QUERY ||
o->eigrp.opcode == EIGRP_OPCODE_REPLY)
{
if (o->eigrp.type == EIGRP_TYPE_INTERNAL ||
o->eigrp.type == EIGRP_TYPE_EXTERNAL)
{
/*
* Enhanced Interior Gateway Routing Protocol (EIGRP)
*
* IP Internal Routes TLV (EIGRP Type = 0x0102)
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length |
* +---------------------------------------------------------------+
* | Next Hop Address |
* +---------------------------------------------------------------+
* | Delay |
* +---------------------------------------------------------------+
* | Bandwidth |
* +---------------------------------------------------------------+
* | Maximum Transmission Unit (MTU) | Hop Count |
* +---------------------------------------------------------------+
* | Reliability | Load | Reserved |
* +---------------------------------------------------------------+
* | Prefix //
* +---------------+
*
* +---------------------------------------------------------------+
* // Destination IP Address(es) (1-4 octets) |
* +---------------------------------------------------------------+
*
* IP External Routes TLV (EIGRP Type = 0x0103)
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length |
* +---------------------------------------------------------------+
* | Next Hop Address |
* +---------------------------------------------------------------+
* | Originating Router |
* +---------------------------------------------------------------+
* | Originating Autonomous System |
* +---------------------------------------------------------------+
* | Arbitrary TAG |
* +---------------------------------------------------------------+
* | External Protocol Metric |
* +---------------------------------------------------------------+
* | Reserved1 | Ext. Proto ID | Flags |
* +---------------------------------------------------------------+
* | Delay |
* +---------------------------------------------------------------+
* | Bandwidth |
* +---------------------------------------------------------------+
* | Maximum Transmission Unit (MTU) | Hop Count |
* +---------------------------------------------------------------+
* | Reliability | Load | Reserved2 |
* +---------------------------------------------------------------+
* | Prefix //
* +---------------+
*
* +---------------------------------------------------------------+
* // Destination IP Address(es) (1-4 octets) |
* +---------------------------------------------------------------+
*
* The only difference between Internal and External Routes TLVs is 20
* octets.
*/
*buffer.word_ptr++ = htons(o->eigrp.type == EIGRP_TYPE_INTERNAL ?
EIGRP_TYPE_INTERNAL : EIGRP_TYPE_EXTERNAL);
/*
* For both Internal and External Routes TLV the code must perform
* an additional step to compute the EIGRP header length, because
* it depends on the the EIGRP Prefix, and it can be 1-4 octets.
*/
*buffer.word_ptr++ = htons(o->eigrp.length ?
o->eigrp.length :
(o->eigrp.type == EIGRP_TYPE_INTERNAL ?
EIGRP_TLEN_INTERNAL :
EIGRP_TLEN_EXTERNAL) +
EIGRP_DADDR_LENGTH(prefix));
*buffer.inaddr_ptr++ = INADDR_RND(o->eigrp.next_hop);
/*
* The only difference between Internal and External Routes TLVs is 20
* octets. Building 20 extra octets for IP External Routes TLV.
*/
if (o->eigrp.type == EIGRP_TYPE_EXTERNAL)
{
*buffer.inaddr_ptr++ = INADDR_RND(o->eigrp.src_router);
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.src_as));
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.tag));
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.proto_metric));
*buffer.word_ptr++ = o->eigrp.opcode == EIGRP_OPCODE_UPDATE ?
FIELD_MUST_BE_ZERO : htons(0x0004);
*buffer.byte_ptr++ = __RND(o->eigrp.proto_id);
*buffer.byte_ptr++ = __RND(o->eigrp.ext_flags);
}
dest = INADDR_RND(o->eigrp.dest);
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.delay));
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.bandwidth));
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.mtu) << 8);
*buffer.byte_ptr++ = __RND(o->eigrp.hop_count);
*buffer.byte_ptr++ = __RND(o->eigrp.reliability);
*buffer.byte_ptr++ = __RND(o->eigrp.load);
*buffer.word_ptr++ = o->eigrp.opcode == EIGRP_OPCODE_UPDATE ?
FIELD_MUST_BE_ZERO : htons(0x0004);
*buffer.byte_ptr++ = prefix;
*buffer.inaddr_ptr++ = EIGRP_DADDR_BUILD(dest, prefix);
buffer.ptr += EIGRP_DADDR_LENGTH(prefix);
offset += (o->eigrp.type == EIGRP_TYPE_INTERNAL ?
EIGRP_TLEN_INTERNAL :
EIGRP_TLEN_EXTERNAL) +
EIGRP_DADDR_LENGTH(prefix);
}
/*
* In the other hand, EIGRP Packet for Hello can carry Paremeter,
* Software Version, Multicast Sequence or nothing (Acknowledge).
*/
}
else if (o->eigrp.opcode == EIGRP_OPCODE_HELLO)
{
/*
* AFAIK, EIGRP TLVs must follow a predefined sequence in order to
* be built. I am not sure whether any TLV's precedence will impact
* in the routers' processing of EIGRP Packet, so I am following
* exactly what I saw on live EIGRP PCAP files. Read the code and
* you will understand what I am talking about.
*/
switch (o->eigrp.type)
{
case EIGRP_TYPE_PARAMETER:
case EIGRP_TYPE_SOFTWARE:
case EIGRP_TYPE_MULTICAST:
/*
* Enhanced Interior Gateway Routing Protocol (EIGRP)
*
* General Parameter TLV (EIGRP Type = 0x0001)
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length |
* +---------------------------------------------------------------+
* | K1 | K2 | K3 | K4 |
* +---------------------------------------------------------------+
* | K5 | Reserved | Hold Time |
* +---------------------------------------------------------------+
*/
*buffer.word_ptr++ = htons(EIGRP_TYPE_PARAMETER);
*buffer.word_ptr++ = htons(o->eigrp.length ?
o->eigrp.length : EIGRP_TLEN_PARAMETER);
*buffer.byte_ptr++ = TEST_BITS(o->eigrp.values, EIGRP_KVALUE_K1) ?
__RND(o->eigrp.k1) : o->eigrp.k1;
*buffer.byte_ptr++ = TEST_BITS(o->eigrp.values, EIGRP_KVALUE_K2) ?
__RND(o->eigrp.k2) : o->eigrp.k2;
*buffer.byte_ptr++ = TEST_BITS(o->eigrp.values, EIGRP_KVALUE_K3) ?
__RND(o->eigrp.k3) : o->eigrp.k3;
*buffer.byte_ptr++ = TEST_BITS(o->eigrp.values, EIGRP_KVALUE_K4) ?
__RND(o->eigrp.k4) : o->eigrp.k4;
*buffer.byte_ptr++ = TEST_BITS(o->eigrp.values, EIGRP_KVALUE_K5) ?
__RND(o->eigrp.k5) : o->eigrp.k5;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(o->eigrp.hold);
offset += EIGRP_TLEN_PARAMETER;
/* Going to the next TLV, if it needs to do so-> */
if (o->eigrp.type == EIGRP_TYPE_SOFTWARE ||
o->eigrp.type == EIGRP_TYPE_MULTICAST)
{
/*
* Enhanced Interior Gateway Routing Protocol (EIGRP)
*
* Software Version TLV (EIGRP Type = 0x0004)
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length |
* +---------------------------------------------------------------+
* | IOS Major | IOS Minor | EIGRP Major | EIGRP Minor |
* +---------------------------------------------------------------+
*/
*buffer.word_ptr++ = htons(EIGRP_TYPE_SOFTWARE);
*buffer.word_ptr++ = htons(o->eigrp.length ?
o->eigrp.length : EIGRP_TLEN_SOFTWARE);
*buffer.byte_ptr++ = __RND(o->eigrp.ios_major);
*buffer.byte_ptr++ = __RND(o->eigrp.ios_minor);
*buffer.byte_ptr++ = __RND(o->eigrp.ver_major);
*buffer.byte_ptr++ = __RND(o->eigrp.ver_minor);
offset += EIGRP_TLEN_SOFTWARE;
/* Going to the next TLV, if it needs to do so-> */
if (o->eigrp.type == EIGRP_TYPE_MULTICAST)
{
/*
* Enhanced Interior Gateway Routing Protocol (EIGRP)
*
* Sequence TLV (EIGRP Type = 0x0003)
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length |
* +---------------------------------------------------------------+
* | Addr Length //
* +---------------+
*
* +---------------------------------------------------------------+
* // IP Address |
* +---------------------------------------------------------------+
*/
*buffer.word_ptr++ = htons(EIGRP_TYPE_SEQUENCE);
*buffer.word_ptr++ = htons(o->eigrp.length ?
o->eigrp.length : EIGRP_TLEN_SEQUENCE);
*buffer.byte_ptr++ = sizeof(o->eigrp.address);
*buffer.inaddr_ptr++ = INADDR_RND(o->eigrp.address);
/*
* Enhanced Interior Gateway Routing Protocol (EIGRP)
*
* Next Multicast Sequence TLV (EIGRP Type = 0x0005)
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Length |
* +---------------------------------------------------------------+
* | Next Multicast Sequence |
* +---------------------------------------------------------------+
*/
*buffer.word_ptr++ = htons(EIGRP_TYPE_MULTICAST);
*buffer.word_ptr++ = htons(o->eigrp.length ?
o->eigrp.length : EIGRP_TLEN_MULTICAST);
*buffer.dword_ptr++ = htonl(__RND(o->eigrp.multicast));
offset += EIGRP_TLEN_MULTICAST +
EIGRP_TLEN_SEQUENCE;
}
}
}
}
/* Computing the checksum. */
eigrp->check = o->bogus_csum ?
random() : cksum(eigrp, offset);
/* GRE Encapsulation takes place. */
gre_checksum(packet, o, packet_size);
/* Setting SOCKADDR structure. */
sin.sin_family = AF_INET;
sin.sin_port = htons(IPPORT_RND(o->dest));
sin.sin_addr.s_addr = o->ip.daddr;
/* Sending packet. */
if (sendto(fd, packet, packet_size, MSG_NOSIGNAL, (struct sockaddr *) &sin, sizeof(struct sockaddr)) == -1 && errno != EPERM)
return 1;
return 0;
}
size_t greoptlen, /* GRE options size. */
esp_data, /* IPSec ESP Data Encrypted (RANDOM). */
counter;
/* Packet. */
memptr_t buffer;
struct iphdr *ip;
/* IPSec AH header and IPSec ESP Header. */
struct ip_auth_hdr *ip_auth;
struct ip_esp_hdr *ip_esp;
assert(co != NULL);
greoptlen = gre_opt_len(co);
esp_data = auth_hmac_md5_len(1);
*size = sizeof(struct iphdr) +
sizeof(struct ip_auth_hdr) +
sizeof(struct ip_esp_hdr) +
greoptlen +
IP_AH_ICV +
esp_data;
/* Try to reallocate packet, if necessary */
alloc_packet(*size);
ip = ip_header(packet, *size, co);
/* GRE Encapsulation takes place. */
gre_encapsulation(packet, co,
/* Function Name: RSVP packet header configuration.
Description: This function configures and sends the RSVP packet header.
Targets: N/A */
int rsvp(const socket_t fd, const struct config_options *o)
{
size_t greoptlen, /* GRE options size. */
objects_length, /* RSVP objects length. */
packet_size,
offset,
counter;
/* Packet and Checksum. */
mptr_t buffer;
/* Socket address and IP header. */
struct sockaddr_in sin;
struct iphdr * ip;
/* RSVP Common header. */
struct rsvp_common_hdr * rsvp;
assert(o != NULL);
greoptlen = gre_opt_len(o->gre.options, o->encapsulated);
objects_length = rsvp_objects_len(o->rsvp.type, o->rsvp.scope, o->rsvp.adspec, o->rsvp.tspec);
packet_size = sizeof(struct iphdr) +
sizeof(struct rsvp_common_hdr) +
greoptlen +
objects_length;
/* Try to reallocate the packet, if necessary */
alloc_packet(packet_size);
/* IP Header structure making a pointer to Packet. */
ip = ip_header(packet, packet_size, o);
/* GRE Encapsulation takes place. */
gre_encapsulation(packet, o,
sizeof(struct iphdr) +
sizeof(struct rsvp_common_hdr) +
objects_length);
/* RSVP Header structure making a pointer to IP Header structure. */
rsvp = (struct rsvp_common_hdr *)((void *)ip + sizeof(struct iphdr) + greoptlen);
rsvp->flags = __RND(o->rsvp.flags);
rsvp->version = RSVPVERSION;
rsvp->type = o->rsvp.type;
rsvp->ttl = __RND(o->rsvp.ttl);
rsvp->length = htons(sizeof(struct rsvp_common_hdr) + objects_length);
rsvp->reserved = FIELD_MUST_BE_ZERO;
rsvp->check = 0;
offset = sizeof(struct rsvp_common_hdr);
buffer.ptr = (void *)rsvp + offset;
/*
* The SESSION Object Class is present for all RSVP Messages.
*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.1 SESSION Class
*
* SESSION Class = 1.
*
* o IPv4/UDP SESSION object: Class = 1, C-Type = 1
*
* +-------------+-------------+-------------+-------------+
* | IPv4 DestAddress (4 bytes) |
* +-------------+-------------+-------------+-------------+
* | Protocol Id | Flags | DstPort |
* +-------------+-------------+-------------+-------------+
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_SESSION);
*buffer.byte_ptr++ = RSVP_OBJECT_SESSION;
*buffer.byte_ptr++ = 1;
*buffer.inaddr_ptr++ = INADDR_RND(o->rsvp.session_addr);
*buffer.byte_ptr++ = __RND(o->rsvp.session_proto);
*buffer.byte_ptr++ = __RND(o->rsvp.session_flags);
*buffer.word_ptr++ = htons(__RND(o->rsvp.session_port));
offset += RSVP_LENGTH_SESSION;
/*
* The RESV_HOP Object Class is present for the following:
* 3.1.3 Path Messages
* 3.1.4 Resv Messages
* 3.1.5 Path Teardown Messages
* 3.1.6 Resv Teardown Messages
* 3.1.8 Resv Error Messages
*/
if (o->rsvp.type == RSVP_MESSAGE_TYPE_PATH ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESV ||
o->rsvp.type == RSVP_MESSAGE_TYPE_PATHTEAR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVTEAR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVERR)
{
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.2 RSVP_HOP Class
*
* RSVP_HOP class = 3.
*
* o IPv4 RSVP_HOP object: Class = 3, C-Type = 1
*
* +-------------+-------------+-------------+-------------+
* | IPv4 Next/Previous Hop Address |
* +-------------+-------------+-------------+-------------+
* | Logical Interface Handle |
* +-------------+-------------+-------------+-------------+
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_RESV_HOP);
*buffer.byte_ptr++ = RSVP_OBJECT_RESV_HOP;
*buffer.byte_ptr++ = 1;
*buffer.inaddr_ptr++ = INADDR_RND(o->rsvp.hop_addr);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.hop_iface));
offset += RSVP_LENGTH_RESV_HOP;
}
/*
* The TIME_VALUES Object Class is present for the following:
* 3.1.3 Path Messages
* 3.1.4 Resv Messages
*/
if (o->rsvp.type == RSVP_MESSAGE_TYPE_PATH ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESV)
{
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.4 TIME_VALUES Class
*
* TIME_VALUES class = 5.
*
* o TIME_VALUES Object: Class = 5, C-Type = 1
*
* +-------------+-------------+-------------+-------------+
* | Refresh Period R |
* +-------------+-------------+-------------+-------------+
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_TIME_VALUES);
*buffer.byte_ptr++ = RSVP_OBJECT_TIME_VALUES;
*buffer.byte_ptr++ = 1;
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.time_refresh));
offset += RSVP_LENGTH_TIME_VALUES;
}
/*
* The ERROR_SPEC Object Class is present for the following:
* 3.1.5 Path Teardown Messages
* 3.1.8 Resv Error Messages
* 3.1.9 Confirmation Messages
*/
if (o->rsvp.type == RSVP_MESSAGE_TYPE_PATHERR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVERR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVCONF)
{
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.5 ERROR_SPEC Class
*
* ERROR_SPEC class = 6.
*
* o IPv4 ERROR_SPEC object: Class = 6, C-Type = 1
*
* +-------------+-------------+-------------+-------------+
* | IPv4 Error Node Address (4 bytes) |
* +-------------+-------------+-------------+-------------+
* | Flags | Error Code | Error Value |
* +-------------+-------------+-------------+-------------+
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_ERROR_SPEC);
*buffer.byte_ptr++ = RSVP_OBJECT_ERROR_SPEC;
*buffer.byte_ptr++ = 1;
*buffer.inaddr_ptr++ = INADDR_RND(o->rsvp.error_addr);
*buffer.byte_ptr++ = __RND(o->rsvp.error_flags);
*buffer.byte_ptr++ = __RND(o->rsvp.error_code);
*buffer.word_ptr++ = htons(__RND(o->rsvp.error_value));
offset += RSVP_LENGTH_ERROR_SPEC;
}
/*
* The SENDER_TEMPLATE, SENDER_TSPEC and ADSPEC Object Classes are
* present for the following:
* 3.1.3 Path Messages
* 3.1.5 Path Teardown Messages
* 3.1.7 Path Error Messages
*/
if (o->rsvp.type == RSVP_MESSAGE_TYPE_PATH ||
o->rsvp.type == RSVP_MESSAGE_TYPE_PATHTEAR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_PATHERR)
{
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.10 SENDER_TEMPLATE Class
*
* SENDER_TEMPLATE class = 11.
*
* o IPv4 SENDER_TEMPLATE object: Class = 11, C-Type = 1
*
* Definition same as IPv4/UDP FILTER_SPEC object.
*
* RSVP Extensions for IPSEC (RFC 2207)
*
* 3.3 SENDER_TEMPLATE Class
*
* SENDER_TEMPLATE class = 11.
*
* o IPv4/GPI SENDER_TEMPLATE object: Class = 11, C-Type = 4
*
* Definition same as IPv4/GPI FILTER_SPEC object.
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_SENDER_TEMPLATE);
*buffer.byte_ptr++ = RSVP_OBJECT_SENDER_TEMPLATE;
*buffer.byte_ptr++ = 1;
*buffer.inaddr_ptr++ = INADDR_RND(o->rsvp.sender_addr);
*buffer.word_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(__RND(o->rsvp.sender_port));
offset += RSVP_LENGTH_SENDER_TEMPLATE;
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.11 SENDER_TSPEC Class
*
* SENDER_TSPEC class = 12.
*
* o Intserv SENDER_TSPEC object: Class = 12, C-Type = 2
*
* The contents and encoding rules for this object are specified
* in documents prepared by the int-serv working group.
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_SENDER_TSPEC +
TSPEC_SERVICES(o->rsvp.tspec));
*buffer.byte_ptr++ = RSVP_OBJECT_SENDER_TSPEC;
*buffer.byte_ptr++ = 2;
/*
* The Use of RSVP with IETF Integrated Services (RFC 2210)
*
* 3.1. RSVP SENDER_TSPEC Object
*
* 31 24 23 16 15 8 7 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 1 | 0 (a) | reserved | 7 (b) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 2 | 1 (c) |0| reserved | 6 (d) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 3 | 127 (e) | 0 (f) | 5 (g) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 4 | Token Bucket Rate [r] (32-bit IEEE floating point number) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 5 | Token Bucket Size [b] (32-bit IEEE floating point number) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 6 | Peak Data Rate [p] (32-bit IEEE floating point number) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 7 | Minimum Policed Unit [m] (32-bit integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 8 | Maximum Packet Size [M] (32-bit integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
*buffer.word_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons((TSPEC_SERVICES(o->rsvp.tspec) -
RSVP_LENGTH_SENDER_TSPEC)/4);
*buffer.byte_ptr++ = o->rsvp.tspec;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(TSPEC_SERVICES(o->rsvp.tspec)/4);
/* Identifying the RSVP TSPEC and building it. */
switch (o->rsvp.tspec)
{
case TSPEC_TRAFFIC_SERVICE:
case TSPEC_GUARANTEED_SERVICE:
*buffer.byte_ptr++ = TSPECT_TOKEN_BUCKET_SERVICE;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons((TSPEC_SERVICES(o->rsvp.tspec) -
TSPEC_MESSAGE_HEADER)/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.tspec_r));
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.tspec_b));
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.tspec_p));
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.tspec_m));
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.tspec_M));
break;
}
offset += RSVP_LENGTH_SENDER_TSPEC + TSPEC_SERVICES(o->rsvp.tspec);
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.12 ADSPEC Class
*
* ADSPEC class = 13.
*
* o Intserv ADSPEC object: Class = 13, C-Type = 2
*
* The contents and format for this object are specified in
* documents prepared by the int-serv working group.
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_ADSPEC +
ADSPEC_SERVICES(o->rsvp.adspec));
*buffer.byte_ptr++ = RSVP_OBJECT_ADSPEC;
*buffer.byte_ptr++ = 2;
/*
* The Use of RSVP with IETF Integrated Services (RFC 2210)
*
* 3.3.1. RSVP ADSPEC format
*
* 31 24 23 16 15 8 7 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | 0 (a) | reserved | Msg length - 1 (b) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* | Default General Parameters fragment (Service 1) (c) |
* | (Always Present) |
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* | Guaranteed Service Fragment (Service 2) (d) |
* | (Present if application might use Guaranteed Service) |
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* | Controlled-Load Service Fragment (Service 5) (e) |
* | (Present if application might use Controlled-Load Service) |
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
*buffer.word_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons((ADSPEC_SERVICES(o->rsvp.adspec) -
ADSPEC_MESSAGE_HEADER)/4);
offset += RSVP_LENGTH_ADSPEC;
/*
* The Use of RSVP with IETF Integrated Services (RFC 2210)
*
* 3.3.2. Default General Characterization Parameters ADSPEC data fragment
*
* 31 24 23 16 15 8 7 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 1 | 1 (c) |x| reserved | 8 (d) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 2 | 4 (e) | (f) | 1 (g) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 3 | IS hop cnt (32-bit unsigned integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 4 | 6 (h) | (i) | 1 (j) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 5 | Path b/w estimate (32-bit IEEE floating point number) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 6 | 8 (k) | (l) | 1 (m) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 7 | Minimum path latency (32-bit integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 8 | 10 (n) | (o) | 1 (p) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 9 | Composed MTU (32-bit unsigned integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
*buffer.byte_ptr++ = ADSPEC_PARAMETER_SERVICE;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons((ADSPEC_PARAMETER_LENGTH - ADSPEC_MESSAGE_HEADER)/4);
*buffer.byte_ptr++ = ADSPEC_PARAMETER_ISHOPCNT;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_hop));
*buffer.byte_ptr++ = ADSPEC_PARAMETER_BANDWIDTH;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_path));
*buffer.byte_ptr++ = ADSPEC_PARAMETER_LATENCY;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_minimum));
*buffer.byte_ptr++ = ADSPEC_PARAMETER_COMPMTU;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_mtu));
offset += ADSPEC_PARAMETER_LENGTH;
/* Identifying the ADSPEC and building it. */
switch (o->rsvp.adspec)
{
case ADSPEC_GUARANTEED_SERVICE:
case ADSPEC_CONTROLLED_SERVICE:
/*
* The Use of RSVP with IETF Integrated Services (RFC 2210)
*
* 3.3.3. Guaranteed Service ADSPEC data fragment
*
* 31 24 23 16 15 8 7 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 1 | 2 (a) |x| reserved | N-1 (b) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 2 | 133 (c) | 0 (d) | 1 (e) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 3 | End-to-end composed value for C [Ctot] (32-bit integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 4 | 134 (f) | (g) | 1 (h) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 5 | End-to-end composed value for D [Dtot] (32-bit integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 6 | 135 (i) | (j) | 1 (k) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 7 | Since-last-reshaping point composed C [Csum] (32-bit integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 8 | 136 (l) | (m) | 1 (n) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 9 | Since-last-reshaping point composed D [Dsum] (32-bit integer) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 10 | Service-specific general parameter headers/values, if present |
* . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .
* N | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
*buffer.byte_ptr++ = ADSPEC_GUARANTEED_SERVICE;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons((ADSPEC_GUARANTEED_LENGTH - ADSPEC_MESSAGE_HEADER)/4);
*buffer.byte_ptr++ = 133;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_Ctot));
*buffer.byte_ptr++ = 134;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_Dtot));
*buffer.byte_ptr++ = 135;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_Csum));
*buffer.byte_ptr++ = 136;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_SERVDATA_HEADER/4);
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.adspec_Dsum));
offset += ADSPEC_GUARANTEED_LENGTH;
/* Going to the next ADSPEC, if it needs to do so-> */
if (o->rsvp.adspec == ADSPEC_CONTROLLED_SERVICE)
{
/*
* The Use of RSVP with IETF Integrated Services (RFC 2210)
*
* 3.3.4. Controlled-Load Service ADSPEC data fragment
*
* 31 24 23 16 15 8 7 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 1 | 5 (a) |x| (b) | N-1 (c) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* 2 | Service-specific general parameter headers/values, if present |
* . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .
* N | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
*buffer.byte_ptr++ = ADSPEC_CONTROLLED_SERVICE;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.word_ptr++ = htons(ADSPEC_CONTROLLED_LENGTH - ADSPEC_MESSAGE_HEADER);
offset += ADSPEC_CONTROLLED_LENGTH;
}
break;
}
}
/*
* The RESV_CONFIRM Object Class is present for the following:
* 3.1.4 Resv Messages
* 3.1.9 Confirmation Messages
*/
if (o->rsvp.type == RSVP_MESSAGE_TYPE_RESV ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVCONF)
{
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.14 Resv_CONFIRM Class
*
* RESV_CONFIRM class = 15.
*
* o IPv4 RESV_CONFIRM object: Class = 15, C-Type = 1
*
* +-------------+-------------+-------------+-------------+
* | IPv4 Receiver Address (4 bytes) |
* +-------------+-------------+-------------+-------------+
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_RESV_CONFIRM);
*buffer.byte_ptr++ = RSVP_OBJECT_RESV_CONFIRM;
*buffer.byte_ptr++ = 1;
*buffer.inaddr_ptr++ = INADDR_RND(o->rsvp.confirm_addr);
offset += RSVP_LENGTH_RESV_CONFIRM;
}
/*
* The STYLE Object Classes is present for the following:
* 3.1.4 Resv Messages
* 3.1.6 Resv Teardown Messages
* 3.1.8 Resv Error Messages
* 3.1.9 Confirmation Messages
*/
if (o->rsvp.type == RSVP_MESSAGE_TYPE_RESV ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVTEAR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVERR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVCONF)
{
/*
* The SCOPE Object Classes is present for the following:
* 3.1.4 Resv Messages
* 3.1.6 Resv Teardown Messages
* 3.1.8 Resv Error Messages
*/
if (o->rsvp.type == RSVP_MESSAGE_TYPE_RESV ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVTEAR ||
o->rsvp.type == RSVP_MESSAGE_TYPE_RESVERR)
{
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.6 SCOPE Class
*
* SCOPE class = 7.
*
* o IPv4 SCOPE List object: Class = 7, C-Type = 1
*
* +-------------+-------------+-------------+-------------+
* | IPv4 Src Address (4 bytes) |
* +-------------+-------------+-------------+-------------+
* // //
* +-------------+-------------+-------------+-------------+
* | IPv4 Src Address (4 bytes) |
* +-------------+-------------+-------------+-------------+
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_SCOPE(o->rsvp.scope));
*buffer.byte_ptr++ = RSVP_OBJECT_SCOPE;
*buffer.byte_ptr++ = 1;
/* Dealing with scope address(es). */
for(counter = 0; counter < o->rsvp.scope ; counter ++)
*buffer.inaddr_ptr++ = INADDR_RND(o->rsvp.address[counter]);
offset += RSVP_LENGTH_SCOPE(o->rsvp.scope);
}
/*
* Resource ReSerVation Protocol (RSVP) (RFC 2205)
*
* A.7 STYLE Class
*
* STYLE class = 8.
*
* o STYLE object: Class = 8, C-Type = 1
*
* +-------------+-------------+-------------+-------------+
* | Flags | Option Vector |
* +-------------+-------------+-------------+-------------+
*/
*buffer.word_ptr++ = htons(RSVP_LENGTH_STYLE);
*buffer.byte_ptr++ = RSVP_OBJECT_STYLE;
*buffer.byte_ptr++ = 1;
*buffer.byte_ptr++ = FIELD_MUST_BE_ZERO;
*buffer.dword_ptr++ = htonl(__RND(o->rsvp.style_opt) << 8);
offset += RSVP_LENGTH_STYLE;
}
/* Computing the checksum. */
rsvp->check = o->bogus_csum ?
random() :
cksum(rsvp, offset);
/* GRE Encapsulation takes place. */
gre_checksum(packet, o, packet_size);
/* Setting SOCKADDR structure. */
sin.sin_family = AF_INET;
sin.sin_port = htons(IPPORT_RND(o->dest));
sin.sin_addr.s_addr = o->ip.daddr;
/* Sending packet. */
if (sendto(fd, packet, packet_size, MSG_NOSIGNAL, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1 && errno != EPERM)
return 1;
return 0;
}
void udp(const struct config_options * const __restrict__ co, size_t *size)
{
size_t greoptlen; /* GRE options size. */
struct iphdr *ip;
/* GRE Encapsulated IP Header. */
struct iphdr *gre_ip;
/* UDP header and PSEUDO header. */
struct udphdr *udp;
struct psdhdr *pseudo;
assert(co != NULL);
greoptlen = gre_opt_len(co->gre.options, co->encapsulated);
*size = sizeof(struct iphdr) + greoptlen + sizeof(struct udphdr) + sizeof(struct psdhdr);
/* Try to reallocate packet, if necessary */
alloc_packet(*size);
/* Fill IP header. */
ip = ip_header(packet, *size, co);
gre_ip = gre_encapsulation(packet, co,
sizeof(struct iphdr) + sizeof(struct udphdr));
/* UDP Header structure making a pointer to IP Header structure. */
udp = (struct udphdr *)((void *)ip + sizeof(struct iphdr) + greoptlen);
udp->source = htons(IPPORT_RND(co->source));
udp->dest = htons(IPPORT_RND(co->dest));