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authorTobias Klauser <tklauser@distanz.ch>2015-10-13 11:53:36 +0200
committerTobias Klauser <tklauser@distanz.ch>2015-10-13 11:53:36 +0200
commit19c15748cb0eb431ef20f32ff629a82a6c2b3635 (patch)
treee17c95afa3c51cdf51c562bbc8abab46d994aa69 /trafgen.c
parentaa43ee0ad84a65efd0415621d5234cfcadf9bed3 (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.c')
-rw-r--r--trafgen.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/trafgen.c b/trafgen.c
index 93bb1b4..71e4f3a 100644
--- a/trafgen.c
+++ b/trafgen.c
@@ -345,6 +345,18 @@ static void apply_csum16(int id)
(packets[id].len - csum->to),
IPPROTO_TCP);
break;
+ case CSUM_UDP6:
+ sum = p6_csum((void *) packets[id].payload + csum->from,
+ packets[id].payload + csum->to,
+ (packets[id].len - csum->to),
+ IPPROTO_UDP);
+ break;
+ case CSUM_TCP6:
+ sum = p6_csum((void *) packets[id].payload + csum->from,
+ packets[id].payload + csum->to,
+ (packets[id].len - csum->to),
+ IPPROTO_TCP);
+ break;
default:
bug();
break;