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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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3
CHANGELOG
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@ -6,6 +6,9 @@ HISTORY
++ New features:
2012-01-16: Simon Goldschmidt
* opt.h, icmp.c: Added option CHECKSUM_GEN_ICMP
2011-12-17: Simon Goldschmidt
* ip.h: implemented API functions to access so_options of IP pcbs (UDP, TCP, RAW)
(fixes bug #35061)

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);

7
src/include/lwip/opt.h
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@ -1854,6 +1854,13 @@
#ifndef CHECKSUM_GEN_TCP
#define CHECKSUM_GEN_TCP 1
#endif
/**
* CHECKSUM_GEN_ICMP==1: Generate checksums in software for outgoing ICMP packets.
*/
#ifndef CHECKSUM_GEN_ICMP
#define CHECKSUM_GEN_ICMP 1
#endif
/**
* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.