diff options
| author | Tobias Klauser <tklauser@distanz.ch> | 2015-10-13 11:53:36 +0200 |
|---|---|---|
| committer | Tobias Klauser <tklauser@distanz.ch> | 2015-10-13 11:53:36 +0200 |
| commit | 19c15748cb0eb431ef20f32ff629a82a6c2b3635 (patch) | |
| tree | e17c95afa3c51cdf51c562bbc8abab46d994aa69 /trafgen.8 | |
| parent | aa43ee0ad84a65efd0415621d5234cfcadf9bed3 (diff) | |
trafgen: Add checksum helpers for TCP/UDP over IPv6
Add the csumudp6 and csumtcp6 helper functions in order to simplify
checksum generation for TCP/UDP packets sent over IPv6.
trafgen example for TCP over IPv6:
{
/* MAC Destination */
fill(0xff, 6),
/* MAC Source */
0x00, 0x02, 0xb3, drnd(3),
/* IPv6 Protocol */
c16(0x86DD),
/* Version, Traffic Class, Flow Label */
0b01100000, c8(0), c16(0),
/* Payload Length */
c16(54),
/* Next Header (TCP) */
c8(6),
/* Hop Limit */
c8(64),
/* Source IPv6 */
0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xba, 0xac, 0x6f, 0xff, 0xfe, 0xa4, 0x12, 0xe3,
/* Destination IPv6 */
0xfe, 0x80, 0x82, 0x2e, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xde, 0xff, 0xfe, 0x00, 0x06, 0xde,
/* TCP Source Port */
c16(55042),
/* TCP Destination Port */
c16(55043),
/* TCP Sequence Number */
drnd(4),
/* TCP Ackn. Number */
c32(0),
/* TCP Header length + TCP SYN/ECN Flag */
c16((8 << 12) | (1 << 1) | (1 << 6))
/* Window Size */
c16(16),
/* TCP Checksum (offset IPv6, offset TCP) */
csumtcp6(14, 54),
/* TCP Options */
0x00, 0x00, 0x01, 0x01, 0x08, 0x0a, 0x06,
0x91, 0x68, 0x7d, 0x06, 0x91, 0x68, 0x6f,
/* Data blob */
"foobar!",
}
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'trafgen.8')
| -rw-r--r-- | trafgen.8 | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -247,6 +247,8 @@ ii) Checksum helper functions (packet offsets start with 0): IP/ICMP checksum: csumip/csumicmp(<off-from>, <off-to>) UDP checksum: csumudp(<off-iphdr>, <off-udpdr>) TCP checksum: csumtcp(<off-iphdr>, <off-tcphdr>) + UDP checksum (IPv6): csumudp6(<off-ip6hdr>, <off-udpdr>) + TCP checksum (IPv6): csumtcp6(<off-ip6hdr>, <off-tcphdr>) .PP iii) Multibyte functions, compile-time expression evaluation: .PP |