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Porting Matti's branch to git.

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This commit is contained in:
Robin Sommer 2011-01-13 14:58:53 -08:00
parent 5d41794034
commit cb64bb6874
14 changed files with 795 additions and 154 deletions
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59
src/net_util.cc
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@ -86,6 +86,14 @@ int udp_checksum(const struct ip* ip, const struct udphdr* up, int len)
#ifdef BROv6
int udp6_checksum(const struct ip6_hdr* ip6, const struct udphdr* up, int len)
{
/**From RFC for udp4 (same for udp6, except for different pseudoheader which is same as for icmp6)
Computed as the 16-bit one's complement of the one's complement sum of a
pseudo header of information from the IP header, the UDP header, and the
data, padded as needed with zero bytes at the end to make a multiple of
two bytes. If the checksum is cleared to zero, then checksuming is
disabled. If the computed checksum is zero, then this field must be set
to 0xFFFF.
**/
uint32 sum;
if ( len % 2 == 1 )
@ -97,19 +105,61 @@ int udp6_checksum(const struct ip6_hdr* ip6, const struct udphdr* up, int len)
sum = ones_complement_checksum((void*) ip6->ip6_src.s6_addr, 16, sum);
sum = ones_complement_checksum((void*) ip6->ip6_dst.s6_addr, 16, sum);
sum = ones_complement_checksum((void*) &len, 4, sum);
uint32 l = htonl(len);
sum = ones_complement_checksum((void*) &l, 4, sum);
uint32 addl_pseudo = htons(IPPROTO_UDP);
sum = ones_complement_checksum((void*) &addl_pseudo, 4, sum);
sum = ones_complement_checksum((void*) up, len, sum);
//printf("checksum, calculated for UDP6: %d\n",sum);
return sum;
}
int icmp6_checksum(const struct icmp* icmpp, const struct ip6_hdr* ip6, int len)
{
/**From RFC
Checksum that covers the ICMPv6 message. This field contains the 16-bit one's
complement of the one's complement sum of the entire ICMPv6 message starting
with the ICMPv6 message type field, prepended with a pseudo-header of IPv6
header fields.
**/
uint32 sum;
if ( len % 2 == 1 )
// Add in pad byte.
sum += htons(((const u_char*) icmpp)[len - 1] << 8);
else
sum = 0;
//pseudoheader as in udp6 above
sum = ones_complement_checksum((void*) ip6->ip6_src.s6_addr, 16, sum);
sum = ones_complement_checksum((void*) ip6->ip6_dst.s6_addr, 16, sum);
uint32 l = htonl(len);
sum = ones_complement_checksum((void*) &l, 4, sum);
uint32 addl_pseudo = htons(IPPROTO_ICMPV6);
sum = ones_complement_checksum((void*) &addl_pseudo, 4, sum);
//pseudoheader complete
sum = ones_complement_checksum((void*) icmpp, len, sum);
//printf("checksum, calculated for ICMP6: %d\n",sum);
return sum;
}
#endif
int icmp_checksum(const struct icmp* icmpp, int len)
{
/**From RFC
Checksum that covers the ICMP message. This is the 16-bit one's
complement of the one's complement sum of the ICMP message starting
with the Type field. The checksum field should be cleared to zero
before generating the checksum.
**/
uint32 sum;
if ( len % 2 == 1 )
// Add in pad byte.
sum = htons(((const u_char*) icmpp)[len - 1] << 8);
@ -118,10 +168,15 @@ int icmp_checksum(const struct icmp* icmpp, int len)
sum = ones_complement_checksum((void*) icmpp, len, sum);
//printf("checksum, calculated for ICMP4: %d\n",sum);
return sum;
}
#define CLASS_A 0x00000000
#define CLASS_B 0x80000000
#define CLASS_C 0xc0000000