abc/lwip
1
0
Fork 0
mirror of https://git.savannah.nongnu.org/git/lwip.git synced 2026-06-27 07:43:37 +08:00
Code Issues Packages Projects Releases Wiki Activity

Contrib module by Dominik Spies: autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h: AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and LWIP_DHCP_AUTOIP_COOP if you want to cooperate with DHCP. Some tips to adapt (see TODO mark in the source code).

Browse Source
This commit is contained in:
fbernon
2007-06-09 16:57:04 +00:00
parent 792f5b3f22
commit e01f342048
10 changed files with 639 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

107
src/netif/etharp.c
View File

@@ -54,7 +54,11 @@
/* ARP needs to inform DHCP of any ARP replies? */
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
# include "lwip/dhcp.h"
#endif
#endif /* LWIP_DHCP && DHCP_DOES_ARP_CHECK */
/* ARP needs to inform AUTOIP of any ARP replies? */
#if (LWIP_AUTOIP)
# include "lwip/autoip.h"
#endif /* LWIP_AUTOIP */
/** the time an ARP entry stays valid after its last update,
* (240 * 5) seconds = 20 minutes.
@@ -70,10 +74,6 @@
#define HWTYPE_ETHERNET 1
/** ARP message types */
#define ARP_REQUEST 1
#define ARP_REPLY 2
#define ARPH_HWLEN(hdr) (ntohs((hdr)->_hwlen_protolen) >> 8)
#define ARPH_PROTOLEN(hdr) (ntohs((hdr)->_hwlen_protolen) & 0xff)
@@ -568,7 +568,15 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
}
hdr = p->payload;
#if LWIP_AUTOIP
/* We have to check if a host already has configured our random
* created link local address and continously check if there is
* a host with this IP-address so we can detect collisions
* */
autoip_arp_reply(netif, hdr);
#endif /* LWIP_AUTOIP */
/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
* structure packing (not using structure copy which breaks strict-aliasing rules). */
SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
@@ -910,6 +918,92 @@ etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
return result;
}
#if LWIP_AUTOIP
/**
* Send an ARP request packet asking for ipaddr.
*
* @param netif the lwip network interface on which to send the request
* @param ipaddr the IP address for which to ask
* @return ERR_OK if the request has been sent
* any other err_t on failure
*/
err_t
etharp_request(struct netif *netif, struct ip_addr *ipaddr)
{
struct eth_addr eth_addr_bc, eth_addr_zero;
u8_t k = netif->hwaddr_len;
while(k > 0) {
k--;
eth_addr_bc.addr[k] = 0xFF;
eth_addr_zero.addr[k] = 0x00;
}
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_request: sending ARP request.\n"));
return etharp_raw( netif,
(struct eth_addr *)netif->hwaddr,
&eth_addr_bc,
(struct eth_addr *)netif->hwaddr,
&netif->ip_addr,
&eth_addr_zero,
ipaddr,
ARP_REQUEST
);
}
err_t
etharp_raw(struct netif *netif, struct eth_addr *ethsrc_addr, struct eth_addr *ethdst_addr, struct eth_addr *hwsrc_addr, struct ip_addr *ipsrc_addr, struct eth_addr *hwdst_addr, struct ip_addr *ipdst_addr, unsigned short int OpCode)
{
struct pbuf *p;
err_t result = ERR_OK;
u8_t k; /* ARP entry index */
/* allocate a pbuf for the outgoing ARP request packet */
p = pbuf_alloc(PBUF_LINK, sizeof(struct etharp_hdr), PBUF_RAM);
/* could allocate a pbuf for an ARP request? */
if(p != NULL) {
struct etharp_hdr *hdr = p->payload;
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
hdr->opcode = htons(OpCode);
k = netif->hwaddr_len;
/* Write the ARP MAC-Addresses */
while(k > 0) {
k--;
hdr->shwaddr.addr[k] = hwsrc_addr->addr[k];
hdr->dhwaddr.addr[k] = hwdst_addr->addr[k];
}
hdr->sipaddr = *(struct ip_addr2 *)ipsrc_addr;
hdr->dipaddr = *(struct ip_addr2 *)ipdst_addr;
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, netif->hwaddr_len);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
k = netif->hwaddr_len;
/* Write the Ethernet MAC-Addresses */
while(k > 0) {
k--;
hdr->ethhdr.dest.addr[k] = ethdst_addr->addr[k];
hdr->ethhdr.src.addr[k] = ethsrc_addr->addr[k];
}
hdr->ethhdr.type = htons(ETHTYPE_ARP);
/* send ARP query */
result = netif->linkoutput(netif, p);
/* free ARP query packet */
pbuf_free(p);
p = NULL;
/* could not allocate pbuf for ARP request */
} else {
result = ERR_MEM;
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 2, ("etharp_raw: could not allocate pbuf for ARP request.\n"));
}
return result;
}
#else
/**
* Send an ARP request packet asking for ipaddr.
*
@@ -969,3 +1063,4 @@ etharp_request(struct netif *netif, struct ip_addr *ipaddr)
}
return result;
}
#endif /* LWIP_AUTOIP */