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Work on bug #48868: Cleanup etharp.c not to use struct eth_hdr: Cleanup etharp_input() to use ethernet_output()

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This commit is contained in:
Dirk Ziegelmeier 2016-08-23 17:23:21 +02:00
parent 6caa7b9927
commit 31778193da
2 changed files with 32 additions and 45 deletions
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62
src/core/ipv4/etharp.c
View File

@ -634,35 +634,13 @@ void
etharp_input(struct pbuf *p, struct netif *netif)
{
struct etharp_hdr *hdr;
struct eth_hdr *ethhdr;
/* these are aligned properly, whereas the ARP header fields might not be */
ip4_addr_t sipaddr, dipaddr;
u8_t for_us;
#if LWIP_AUTOIP
const u8_t * ethdst_hwaddr;
#endif /* LWIP_AUTOIP */
LWIP_ERROR("netif != NULL", (netif != NULL), return;);
/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
if (p->len < SIZEOF_ETHARP_PACKET) {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
("etharp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
(s16_t)SIZEOF_ETHARP_PACKET));
ETHARP_STATS_INC(etharp.lenerr);
ETHARP_STATS_INC(etharp.drop);
pbuf_free(p);
return;
}
ethhdr = (struct eth_hdr *)p->payload;
hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
#if ETHARP_SUPPORT_VLAN
if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
}
#endif /* ETHARP_SUPPORT_VLAN */
hdr = (struct etharp_hdr *)p->payload;
/* RFC 826 "Packet Reception": */
if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
@ -730,27 +708,26 @@ etharp_input(struct pbuf *p, struct netif *netif)
LWIP_ASSERT("netif->hwaddr_len must be the same as ETH_HWADDR_LEN for etharp!",
(netif->hwaddr_len == ETH_HWADDR_LEN));
#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) */
ethdst_hwaddr = ip4_addr_islinklocal(netif_ip4_addr(netif)) ? (const u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
#endif /* LWIP_AUTOIP */
ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
#if LWIP_AUTOIP
ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
#else /* LWIP_AUTOIP */
ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
#endif /* LWIP_AUTOIP */
ETHADDR16_COPY(&hdr->shwaddr, netif->hwaddr);
ETHADDR16_COPY(&ethhdr->src, netif->hwaddr);
/* 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 */
netif->linkoutput(netif, p);
#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);
}
/* we are not configured? */
} else if (ip4_addr_isany_val(*netif_ip4_addr(netif))) {
/* { for_us == 0 and netif->ip_addr.addr == 0 } */
@ -1187,12 +1164,11 @@ etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
if(ip4_addr_islinklocal(ipsrc_addr)) {
ethernet_output(netif, p, ethsrc_addr, &ethbroadcast, ETHTYPE_ARP);
} else {
} else
#endif /* LWIP_AUTOIP */
{
ethernet_output(netif, p, ethsrc_addr, ethdst_addr, ETHTYPE_ARP);
}
#else /* LWIP_AUTOIP */
ethernet_output(netif, p, ethsrc_addr, ethdst_addr, ETHTYPE_ARP);
#endif /* LWIP_AUTOIP */
ETHARP_STATS_INC(etharp.xmit);
/* free ARP query packet */

11
src/netif/ethernet.c
View File

@ -174,8 +174,19 @@ ethernet_input(struct pbuf *p, struct netif *netif)
if (!(netif->flags & NETIF_FLAG_ETHARP)) {
goto free_and_return;
}
/* skip Ethernet header */
if ((p->len < ip_hdr_offset) || pbuf_header(p, (s16_t)-ip_hdr_offset)) {
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
("ethernet_input: ARP response packet dropped, too short (%"S16_F"/%"S16_F")\n",
p->tot_len, ip_hdr_offset));
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
ETHARP_STATS_INC(etharp.lenerr);
ETHARP_STATS_INC(etharp.drop);
goto free_and_return;
} else {
/* pass p to ARP module */
etharp_input(p, netif);
}
break;
#endif /* LWIP_IPV4 && LWIP_ARP */
#if PPPOE_SUPPORT