mirror/lwip
1
0
Fork 0
mirror of https://github.com/lwip-tcpip/lwip.git synced 2025-01-12 21:41:28 +00:00
Code Issues Packages Projects Releases Wiki Activity

More debugging in checksum routines.

Browse Source
This commit is contained in:
likewise 2003-01-08 15:36:25 +00:00
parent c786f238ef
commit a528a2323e
1 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/core/inet.c
View File

@ -53,14 +53,19 @@ lwip_chksum(void *dataptr, int len)
{
u32_t acc;
DEBUGF(INET_DEBUG, ("lwip_chksum(%p, %d)\n", dataptr, len));
for(acc = 0; len > 1; len -= 2) {
acc = acc + *((u16_t *)dataptr)++;
// acc = acc + *((u16_t *)dataptr)++;
acc += *(u16_t *)dataptr;
dataptr = (void *)((u16_t *)dataptr + 1);
}
/* add up any odd byte */
if(len == 1) {
acc += htons((u16_t)((*(u8_t *)dataptr) & 0xff) << 8);
DEBUGF(INET_DEBUG, ("inet: chksum: odd byte %d\n", *(u8_t *)dataptr));
} else {
DEBUGF(INET_DEBUG, ("inet: chksum: no odd byte\n"));
}
acc = (acc >> 16) + (acc & 0xffffUL);
@ -87,8 +92,11 @@ inet_chksum_pseudo(struct pbuf *p,
acc = 0;
swapped = 0;
/* iterate through all pbuf in chain */
for(q = p; q != NULL; q = q->next) {
DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n", q, q->next));
acc += lwip_chksum(q->payload, q->len);
//DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%lx \n", acc));
while(acc >> 16) {
acc = (acc & 0xffffUL) + (acc >> 16);
}
@ -96,6 +104,7 @@ inet_chksum_pseudo(struct pbuf *p,
swapped = 1 - swapped;
acc = ((acc & 0xff) << 8) | ((acc & 0xff00UL) >> 8);
}
//DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%lx \n", acc));
}
if(swapped) {
@ -111,6 +120,7 @@ inet_chksum_pseudo(struct pbuf *p,
while(acc >> 16) {
acc = (acc & 0xffffUL) + (acc >> 16);
}
DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%lx\n", acc));
return ~(acc & 0xffffUL);
}
/*-----------------------------------------------------------------------------------*/