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tayga: fix broken ICMP checksum on big-endian machines 

This patches fixes wrong ICMP checksum of translated packets on
big-endian machines #16715
The patch is authored by upstream author
Nathan Lutchansky <lutchann@litech.org>
Source of the patch: http://forum.mikrotik.com/viewtopic.php?f=15&t=82329

Signed-off-by: Ondrej Caletka <ondrej@caletka.cz>
This commit is contained in:
Ondřej Caletka 2014-06-23 10:45:49 +02:00
parent ee7a6cd35b
commit 8a90bbadd7
1 changed files with 53 additions and 0 deletions
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53
ipv6/tayga/patches/002-bigendian_wrong_checksum.patch Normal file
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@ -0,0 +1,53 @@
--- a/nat64.c
+++ b/nat64.c
@@ -19,6 +19,11 @@
extern struct config *gcfg;
+static uint16_t checksum_extend_byte(uint8_t b)
+{
+ return htons(b << 8);
+}
+
static uint16_t ip_checksum(void *d, int c)
{
uint32_t sum = 0xffff;
@@ -30,7 +35,7 @@ static uint16_t ip_checksum(void *d, int
}
if (c)
- sum += htons(*((uint8_t *)p) << 8);
+ sum += checksum_extend_byte(*((uint8_t *)p));
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
@@ -180,10 +185,12 @@ static int xlate_payload_4to6(struct pkt
cksum = ones_add(p->icmp->cksum, cksum);
if (p->icmp->type == 8) {
p->icmp->type = 128;
- p->icmp->cksum = ones_add(cksum, ~(128 - 8));
+ p->icmp->cksum = ones_add(cksum,
+ ~checksum_extend_byte(128 - 8));
} else {
p->icmp->type = 129;
- p->icmp->cksum = ones_add(cksum, ~(129 - 0));
+ p->icmp->cksum = ones_add(cksum,
+ ~checksum_extend_byte(129 - 0));
}
return 0;
case 17:
@@ -668,10 +675,12 @@ static int xlate_payload_6to4(struct pkt
cksum = ones_add(p->icmp->cksum, cksum);
if (p->icmp->type == 128) {
p->icmp->type = 8;
- p->icmp->cksum = ones_add(cksum, 128 - 8);
+ p->icmp->cksum = ones_add(cksum,
+ checksum_extend_byte(128 - 8));
} else {
p->icmp->type = 0;
- p->icmp->cksum = ones_add(cksum, 129 - 0);
+ p->icmp->cksum = ones_add(cksum,
+ checksum_extend_byte(129 - 0));
}
return 0;
case 17: