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Added option CHECKSUM_GEN_ICMP

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goldsimon
2012-01-16 09:40:15 +01:00
parent e9255d3714
commit 69d61eda01
3 changed files with 14 additions and 0 deletions
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4
src/core/ipv4/icmp.c
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@@ -189,12 +189,16 @@ icmp_input(struct pbuf *p, struct netif *inp)
ip_addr_copy(iphdr->src, *ip_current_dest_addr());
ip_addr_copy(iphdr->dest, *ip_current_src_addr());
ICMPH_TYPE_SET(iecho, ICMP_ER);
#if CHECKSUM_GEN_ICMP
/* adjust the checksum */
if (iecho->chksum >= PP_HTONS(0xffffU - (ICMP_ECHO << 8))) {
iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
} else {
iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
}
#else /* CHECKSUM_GEN_ICMP */
iecho->chksum = 0;
#endif /* CHECKSUM_GEN_ICMP */
/* Set the correct TTL and recalculate the header checksum. */
IPH_TTL_SET(iphdr, ICMP_TTL);