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Done some work on task #1549 (function documentation)

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goldsimon 2007-06-03 11:26:55 +00:00
parent 7abfe74fa4
commit 4f7dc3c76c
1 changed files with 29 additions and 12 deletions
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41
src/core/ipv4/icmp.c
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@ -43,6 +43,15 @@
#include "lwip/stats.h" #include "lwip/stats.h"
#include "lwip/snmp.h" #include "lwip/snmp.h"
/**
* Processes ICMP input packets, called from ip_input().
*
* Currently only processes icmp echo requests and sends
* out the echo response.
*
* @param p the icmp echo request packet, p->payload pointing to the ip header
* @param inp the netif on which this packet was received
*/
void void
icmp_input(struct pbuf *p, struct netif *inp) icmp_input(struct pbuf *p, struct netif *inp)
{ {
@ -152,7 +161,8 @@ icmp_input(struct pbuf *p, struct netif *inp)
ICMP_TTL, 0, IP_PROTO_ICMP, inp); ICMP_TTL, 0, IP_PROTO_ICMP, inp);
break; break;
default: default:
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n", (s16_t)type, (s16_t)code)); LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
(s16_t)type, (s16_t)code));
ICMP_STATS_INC(icmp.proterr); ICMP_STATS_INC(icmp.proterr);
ICMP_STATS_INC(icmp.drop); ICMP_STATS_INC(icmp.drop);
} }
@ -170,6 +180,15 @@ memerr:
return; return;
} }
/**
* Send an icmp 'destination unreachable' packet, called from ip_input() if
* the transport layer protocol is unknown and from udp_input() if the local
* port is not bound.
*
* @param p the input packet for which the 'unreachable' should be sent,
* p->payload pointing to the IP header
* @param t type of the 'unreachable' packet
*/
void void
icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t) icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
{ {
@ -197,12 +216,18 @@ icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
/* increase number of destination unreachable messages attempted to send */ /* increase number of destination unreachable messages attempted to send */
snmp_inc_icmpoutdestunreachs(); snmp_inc_icmpoutdestunreachs();
ip_output(q, NULL, &(iphdr->src), ip_output(q, NULL, &(iphdr->src), ICMP_TTL, 0, IP_PROTO_ICMP);
ICMP_TTL, 0, IP_PROTO_ICMP);
pbuf_free(q); pbuf_free(q);
} }
#if IP_FORWARD #if IP_FORWARD
/**
* Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
*
* @param p the input packet for which the 'time exceeded' should be sent,
* p->payload pointing to the IP header
* @param t type of the 'time exceeded' packet
*/
void void
icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t) icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
{ {
@ -234,16 +259,8 @@ icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
snmp_inc_icmpoutmsgs(); snmp_inc_icmpoutmsgs();
/* increase number of destination unreachable messages attempted to send */ /* increase number of destination unreachable messages attempted to send */
snmp_inc_icmpouttimeexcds(); snmp_inc_icmpouttimeexcds();
ip_output(q, NULL, &(iphdr->src), ip_output(q, NULL, &(iphdr->src), ICMP_TTL, 0, IP_PROTO_ICMP);
ICMP_TTL, 0, IP_PROTO_ICMP);
pbuf_free(q); pbuf_free(q);
} }
#endif /* IP_FORWARD */ #endif /* IP_FORWARD */