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Remove special ARP reply optimization from etharp.c

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- Code duplication with etharp_raw()
- No great effect on perfomance
- May make reworking PBUF handling code more complicated (see bug #49914)
- The check for p->type == PBUF_REF is a strange special case, too
- Simon also voted to remove it

(cherry picked from commit 47bac3c11f)
This commit is contained in:
Dirk Ziegelmeier 2017-01-18 12:25:09 +01:00 committed by goldsimon
parent e53c84654e
commit 4fc3770278
1 changed files with 8 additions and 39 deletions
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47
src/core/ipv4/etharp.c
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@ -699,47 +699,16 @@ etharp_input(struct pbuf *p, struct netif *netif)
LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_input: incoming ARP request\n"));
/* ARP request for our address? */
if (for_us) {
if (p->type == PBUF_REF) {
ip4_addr_t sipaddr;
IPADDR2_COPY(&sipaddr.addr, &hdr->sipaddr);
ip4_addr_t sipaddr;
etharp_raw(netif,
(struct eth_addr *)netif->hwaddr, &hdr->dhwaddr,
(struct eth_addr *)netif->hwaddr, netif_ip4_addr(netif),
&hdr->shwaddr, &sipaddr,
ARP_REPLY);
} else {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_input: replying to ARP request for our IP address\n"));
/* Re-use pbuf to send ARP reply.
Since we are re-using an existing pbuf, we can't call etharp_raw since
that would allocate a new pbuf. */
hdr->opcode = lwip_htons(ARP_REPLY);
/* Need an aligned copy of source IP */
IPADDR2_COPY(&sipaddr.addr, &hdr->sipaddr);
IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
IPADDR2_COPY(&hdr->sipaddr, netif_ip4_addr(netif));
LWIP_ASSERT("netif->hwaddr_len must be the same as ETH_HWADDR_LEN for etharp!",
(netif->hwaddr_len == ETH_HWADDR_LEN));
/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
are already correct, we tested that before */
ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
ETHADDR16_COPY(&hdr->shwaddr, netif->hwaddr);
/* return ARP reply */
#if LWIP_AUTOIP
/* If we are using Link-Local, all ARP packets that contain a Link-Local
* 'sender IP address' MUST be sent using link-layer broadcast instead of
* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
if (ip4_addr_islinklocal(netif_ip4_addr(netif))) {
ethernet_output(netif, p, &hdr->shwaddr, &ethbroadcast, ETHTYPE_ARP);
} else
#endif /* LWIP_AUTOIP */
{
ethernet_output(netif, p, &hdr->shwaddr, &hdr->dhwaddr, ETHTYPE_ARP);
}
}
etharp_raw(netif,
(struct eth_addr *)netif->hwaddr, &hdr->dhwaddr,
(struct eth_addr *)netif->hwaddr, netif_ip4_addr(netif),
&hdr->shwaddr, &sipaddr,
ARP_REPLY);
/* we are not configured? */
} else if (ip4_addr_isany_val(*netif_ip4_addr(netif))) {
/* { for_us == 0 and netif->ip_addr.addr == 0 } */