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Correctly handle incoming and outgoing IP packets in uip_arp.c

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logicog
2026-03-09 22:06:57 +01:00
parent 820477cd27
commit a45d0f659f
1 changed files with 38 additions and 21 deletions
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uip/uip_arp.c
+38 -21
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@@ -93,7 +93,7 @@ struct arp_hdr_o {
u16_t dipaddr[2]; u16_t dipaddr[2];
}; };
struct ethip_hdr { struct ethip_hdr_o {
struct uip_eth_hdr ethhdr; struct uip_eth_hdr ethhdr;
/* IP header. */ /* IP header. */
u8_t vhl, u8_t vhl,
@@ -109,6 +109,23 @@ struct ethip_hdr {
u16_t sport, dport; u16_t sport, dport;
}; };
struct ethip_hdr_i {
struct uip_eth_hdr ethhdr;
struct rtl_tag rtl_tag;
/* IP header. */
u8_t vhl,
tos,
len[2],
ipid[2],
ipoffset[2],
ttl,
proto;
u16_t ipchksum;
u16_t srcipaddr[2],
destipaddr[2];
u16_t sport, dport;
};
#define ARP_REQUEST 1 #define ARP_REQUEST 1
#define ARP_REPLY 2 #define ARP_REPLY 2
@@ -131,9 +148,10 @@ static __xdata u8_t i, c;
static __xdata u8_t arptime; static __xdata u8_t arptime;
static __xdata u8_t tmpage; static __xdata u8_t tmpage;
#define BUF ((__xdata struct arp_hdr_i *)&uip_buf[0]) #define BUF ((__xdata struct arp_hdr_i *)&uip_buf[0])
#define BUF_O ((__xdata struct arp_hdr_o *)&uip_buf[RTL_TAG_SIZE + VLAN_TAG_SIZE]) #define BUF_O ((__xdata struct arp_hdr_o *)&uip_buf[RTL_TAG_SIZE + VLAN_TAG_SIZE])
#define IPBUF ((__xdata struct ethip_hdr *)&uip_buf[RTL_TAG_SIZE + VLAN_TAG_SIZE]) #define IPBUF_I ((__xdata struct ethip_hdr_i *)&uip_buf[0])
#define IPBUF_O ((__xdata struct ethip_hdr_o *)&uip_buf[RTL_TAG_SIZE + VLAN_TAG_SIZE])
/*-----------------------------------------------------------------------------------*/ /*-----------------------------------------------------------------------------------*/
/** /**
* Initialize the ARP module. * Initialize the ARP module.
@@ -243,18 +261,18 @@ void
uip_arp_ipin(void) __banked uip_arp_ipin(void) __banked
{ {
uip_len -= sizeof(struct uip_eth_hdr); uip_len -= sizeof(struct uip_eth_hdr);
/* Only insert/update an entry if the source IP address of the /* Only insert/update an entry if the source IP address of the
incoming IP packet comes from a host on the local network. */ incoming IP packet comes from a host on the local network. */
if((IPBUF->srcipaddr[0] & uip_netmask[0]) != if((IPBUF_I->srcipaddr[0] & uip_netmask[0]) !=
(uip_hostaddr[0] & uip_netmask[0])) { (uip_hostaddr[0] & uip_netmask[0])) {
return; return;
} }
if((IPBUF->srcipaddr[1] & uip_netmask[1]) != if((IPBUF_I->srcipaddr[1] & uip_netmask[1]) !=
(uip_hostaddr[1] & uip_netmask[1])) { (uip_hostaddr[1] & uip_netmask[1])) {
return; return;
} }
uip_arp_update(IPBUF->srcipaddr, &(IPBUF->ethhdr.src)); uip_arp_update(IPBUF_I->srcipaddr, &(IPBUF_I->ethhdr.src));
return; return;
} }
@@ -302,8 +320,7 @@ uip_arp_arpin(void) __banked
with this host in the future. */ with this host in the future. */
uip_arp_update(BUF->sipaddr, &BUF->shwaddr); uip_arp_update(BUF->sipaddr, &BUF->shwaddr);
/* The reply opcode is 2. */ BUF_O->opcode = HTONS(ARP_REPLY);
BUF_O->opcode = HTONS(2);
memcpy(BUF_O->dhwaddr.addr, BUF->shwaddr.addr, 6); memcpy(BUF_O->dhwaddr.addr, BUF->shwaddr.addr, 6);
memcpy(BUF_O->shwaddr.addr, uip_ethaddr.addr, 6); memcpy(BUF_O->shwaddr.addr, uip_ethaddr.addr, 6);
@@ -371,24 +388,24 @@ uip_arp_out(void) __banked
If not ARP table entry is found, we overwrite the original IP If not ARP table entry is found, we overwrite the original IP
packet with an ARP request for the IP address. */ packet with an ARP request for the IP address. */
if (IPBUF->sport == 0x4300 && !IPBUF->destipaddr[0] && !IPBUF->destipaddr[1]) { if (IPBUF_O->sport == 0x4300 && !IPBUF_O->destipaddr[0] && !IPBUF_O->destipaddr[1]) {
IPBUF->destipaddr[0] = 0xffff; IPBUF_O->destipaddr[0] = 0xffff;
IPBUF->destipaddr[1] = 0xffff; IPBUF_O->destipaddr[1] = 0xffff;
IPBUF->dport = 0x4400; IPBUF_O->dport = 0x4400;
} }
/* First check if destination is a local broadcast. */ /* First check if destination is a local broadcast. */
if(uip_ipaddr_cmpc(IPBUF->destipaddr, broadcast_ipaddr)) { if(uip_ipaddr_cmpc(IPBUF_O->destipaddr, broadcast_ipaddr)) {
memcpyc(IPBUF->ethhdr.dest.addr, broadcast_ethaddr.addr, 6); memcpyc(IPBUF_O->ethhdr.dest.addr, broadcast_ethaddr.addr, 6);
} else { } else {
/* Check if the destination address is on the local network. */ /* Check if the destination address is on the local network. */
if(!uip_ipaddr_maskcmp(IPBUF->destipaddr, uip_hostaddr, uip_netmask)) { if(!uip_ipaddr_maskcmp(IPBUF_O->destipaddr, uip_hostaddr, uip_netmask)) {
/* Destination address was not on the local network, so we need to /* Destination address was not on the local network, so we need to
use the default router's IP address instead of the destination use the default router's IP address instead of the destination
address when determining the MAC address. */ address when determining the MAC address. */
uip_ipaddr_copy(ipaddr, uip_draddr); uip_ipaddr_copy(ipaddr, uip_draddr);
} else { } else {
/* Else, we use the destination IP address. */ /* Else, we use the destination IP address. */
uip_ipaddr_copy(ipaddr, IPBUF->destipaddr); uip_ipaddr_copy(ipaddr, IPBUF_O->destipaddr);
} }
for(i = 0; i < UIP_ARPTAB_SIZE; ++i) { for(i = 0; i < UIP_ARPTAB_SIZE; ++i) {
@@ -423,11 +440,11 @@ uip_arp_out(void) __banked
} }
/* Build an ethernet header. */ /* Build an ethernet header. */
memcpy(IPBUF->ethhdr.dest.addr, tabptr->ethaddr.addr, 6); memcpy(IPBUF_O->ethhdr.dest.addr, tabptr->ethaddr.addr, 6);
} }
memcpy(IPBUF->ethhdr.src.addr, uip_ethaddr.addr, 6); memcpy(IPBUF_O->ethhdr.src.addr, uip_ethaddr.addr, 6);
IPBUF->ethhdr.type = HTONS(UIP_ETHTYPE_IP); IPBUF_O->ethhdr.type = HTONS(UIP_ETHTYPE_IP);
uip_len += sizeof(struct uip_eth_hdr); uip_len += sizeof(struct uip_eth_hdr);
} }