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lwip: icmp: allow reporting ICMP destination unreachable

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Allow reporting ICMP destination unreachable messages via a user-defined
callback.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
This commit is contained in:
Jerome Forissier
2025-08-12 14:43:18 +02:00
parent 0cabbe3235
commit fbd79b493d
1 changed files with 13 additions and 4 deletions
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17
lib/lwip/lwip/src/core/ipv4/icmp.c
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@@ -80,9 +80,9 @@ void
icmp_input(struct pbuf *p, struct netif *inp)
{
u8_t type;
#ifdef LWIP_DEBUG
#if defined(LWIP_DEBUG) || defined(ICMP_DEST_UNREACH_CB)
u8_t code;
#endif /* LWIP_DEBUG */
#endif
struct icmp_echo_hdr *iecho;
const struct ip_hdr *iphdr_in;
u16_t hlen;
@@ -103,11 +103,11 @@ icmp_input(struct pbuf *p, struct netif *inp)
}
type = *((u8_t *)p->payload);
#ifdef LWIP_DEBUG
#if defined(LWIP_DEBUG) || defined(ICMP_DEST_UNREACH_CB)
code = *(((u8_t *)p->payload) + 1);
/* if debug is enabled but debug statement below is somehow disabled: */
LWIP_UNUSED_ARG(code);
#endif /* LWIP_DEBUG */
#endif
switch (type) {
case ICMP_ER:
/* This is OK, echo reply might have been parsed by a raw PCB
@@ -257,6 +257,15 @@ icmp_input(struct pbuf *p, struct netif *inp)
default:
if (type == ICMP_DUR) {
MIB2_STATS_INC(mib2.icmpindestunreachs);
#ifdef ICMP_DEST_UNREACH_CB
/*
* The callback receives the IP packet (not the ICMP message) so that
* it can extract the source address for example
*/
pbuf_add_header(p, IP_HLEN);
ICMP_DEST_UNREACH_CB(code, p);
pbuf_remove_header(p, IP_HLEN);
#endif
} else if (type == ICMP_TE) {
MIB2_STATS_INC(mib2.icmpintimeexcds);
} else if (type == ICMP_PP) {