/**
* Select the best IPv6 source address for a given destination
* IPv6 address. Loosely follows RFC 3484. "Strong host" behavior
* is assumed.
*
* @param netif the netif on which to send a packet
* @param dest the destination we are trying to reach
* @return the most suitable source address to use, or NULL if no suitable
* source address is found
*/
const ip_addr_t *
ip6_select_source_address(struct netif *netif, const ip6_addr_t * dest)
{
const ip_addr_t *src = NULL;
u8_t i;
/* If dest is link-local, choose a link-local source. */
if (ip6_addr_islinklocal(dest) || ip6_addr_ismulticast_linklocal(dest) || ip6_addr_ismulticast_iflocal(dest)) {
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
ip6_addr_islinklocal(netif_ip6_addr(netif, i))) {
return netif_ip_addr6(netif, i);
}
}
}
/* Choose a site-local with matching prefix. */
if (ip6_addr_issitelocal(dest) || ip6_addr_ismulticast_sitelocal(dest)) {
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
ip6_addr_issitelocal(netif_ip6_addr(netif, i)) &&
ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
return netif_ip_addr6(netif, i);
}
}
}
/* Choose a unique-local with matching prefix. */
if (ip6_addr_isuniquelocal(dest) || ip6_addr_ismulticast_orglocal(dest)) {
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
ip6_addr_isuniquelocal(netif_ip6_addr(netif, i)) &&
ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
return netif_ip_addr6(netif, i);
}
}
}
/* Choose a global with best matching prefix. */
if (ip6_addr_isglobal(dest) || ip6_addr_ismulticast_global(dest)) {
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
ip6_addr_isglobal(netif_ip6_addr(netif, i))) {
if (src == NULL) {
src = netif_ip_addr6(netif, i);
}
else {
/* Replace src only if we find a prefix match. */
/* TODO find longest matching prefix. */
if ((!(ip6_addr_netcmp(ip_2_ip6(src), dest))) &&
ip6_addr_netcmp(netif_ip6_addr(netif, i), dest)) {
src = netif_ip_addr6(netif, i);
}
}
}
}
if (src != NULL) {
return src;
}
}
/* Last resort: see if arbitrary prefix matches. */
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
return netif_ip_addr6(netif, i);
}
}
return NULL;
}
/*********************************************************************************************************
** 函数名称: __netIfShow
** 功能描述: 显示指定的网络接口信息 (ip v4)
** 输 入 : pcIfName 网络接口名
** netifShow 网络接口结构
** 输 出 : NONE
** 全局变量:
** 调用模块:
*********************************************************************************************************/
static VOID __netIfShow (CPCHAR pcIfName, const struct netif *netifShow)
{
struct netif *netif;
CHAR cSpeed[32];
ip_addr_t ipaddrBroadcast;
INT i;
if ((pcIfName == LW_NULL) && (netifShow == LW_NULL)) {
return;
}
if (netifShow) {
netif = (struct netif *)netifShow;
} else {
netif = netif_find((PCHAR)pcIfName);
}
if (netif == LW_NULL) {
return;
}
/*
* 打印网口基本信息
*/
printf("%c%c%d ", netif->name[0], netif->name[1], netif->num);
printf("enable: %s ", (netif_is_up(netif) > 0) ? "true" : "false");
printf("linkup: %s ", (netif_is_link_up(netif) > 0) ? "true" : "false");
printf("MTU: %d ", netif->mtu);
printf("multicast: %s\n", (netif->flags & NETIF_FLAG_IGMP) ? "true" : "false");
/*
* 打印路由信息
*/
if (netif == netif_default) { /* route interface */
printf(" metric: 1 ");
} else {
printf(" metric: 0 ");
}
/*
* 打印网口硬件地址信息
*/
if (netif->flags & NETIF_FLAG_ETHARP) {
printf("type: Ethernet-Cap HWaddr: "); /* 以太网络 */
for (i = 0; i < netif->hwaddr_len - 1; i++) {
printf("%02X:", netif->hwaddr[i]);
}
printf("%02X\n", netif->hwaddr[netif->hwaddr_len - 1]);
} else if (netif->flags & NETIF_FLAG_POINTTOPOINT) {
printf("type: WAN(PPP/SLIP)\n"); /* 点对点网络接口 */
} else {
printf("type: General\n"); /* 通用网络接口 */
}
__netIfSpeed(netif, cSpeed, sizeof(cSpeed));
#if LWIP_DHCP
printf(" DHCP: %s(%s) speed: %s\n",
(netif->flags2 & NETIF_FLAG2_DHCP) ? "Enable" : "Disable",
(netif->dhcp) ? "On" : "Off", cSpeed);
#else
printf(" speed: %s\n", cSpeed); /* 打印链接速度 */
#endif /* LWIP_DHCP */
/*
* 打印网口协议地址信息
*/
printf(" inet addr: %d.%d.%d.%d ", ip4_addr1(&netif->ip_addr),
ip4_addr2(&netif->ip_addr),
ip4_addr3(&netif->ip_addr),
ip4_addr4(&netif->ip_addr));
printf("netmask: %d.%d.%d.%d\n", ip4_addr1(&netif->netmask),
ip4_addr2(&netif->netmask),
ip4_addr3(&netif->netmask),
ip4_addr4(&netif->netmask));
if (netif->flags & NETIF_FLAG_POINTTOPOINT) {
printf(" P-to-P: %d.%d.%d.%d ", ip4_addr1(&netif->gw),
ip4_addr2(&netif->gw),
ip4_addr3(&netif->gw),
ip4_addr4(&netif->gw));
} else {
printf(" gateway: %d.%d.%d.%d ", ip4_addr1(&netif->gw),
ip4_addr2(&netif->gw),
ip4_addr3(&netif->gw),
ip4_addr4(&netif->gw));
}
if (netif->flags & NETIF_FLAG_BROADCAST) { /* 打印广播地址信息 */
ipaddrBroadcast.addr = (netif->ip_addr.addr | (~netif->netmask.addr));
printf("broadcast: %d.%d.%d.%d\n", ip4_addr1(&ipaddrBroadcast),
ip4_addr2(&ipaddrBroadcast),
ip4_addr3(&ipaddrBroadcast),
ip4_addr4(&ipaddrBroadcast));
} else {
printf("broadcast: Non\n");
}
/*
* 打印 ipv6 信息
*/
for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
PCHAR pcAddrStat;
PCHAR pcAddrType;
CHAR cBuffer[64];
if (ip6_addr_istentative(netif->ip6_addr_state[i])) {
pcAddrStat = "tentative";
} else if (ip6_addr_isvalid(netif->ip6_addr_state[i])) {
pcAddrStat = "valid";
} else if (ip6_addr_ispreferred(netif->ip6_addr_state[i])) {
pcAddrStat = "preferred";
} else {
continue;
}
if (ip6_addr_isglobal(&netif->ip6_addr[i])) {
pcAddrType = "global";
} else if (ip6_addr_islinklocal(&netif->ip6_addr[i])) {
pcAddrType = "link";
} else if (ip6_addr_issitelocal(&netif->ip6_addr[i])) {
pcAddrType = "site";
} else if (ip6_addr_isuniquelocal(&netif->ip6_addr[i])) {
pcAddrType = "uniquelocal";
} else if (ip6_addr_isloopback(&netif->ip6_addr[i])) {
pcAddrType = "loopback";
} else {
pcAddrType = "unknown";
}
printf(" inet6 addr: %s Scope:%s <%s>\n",
ip6addr_ntoa_r(&netif->ip6_addr[i], cBuffer, sizeof(cBuffer)),
pcAddrType, pcAddrStat);
}
/*
* 打印网口收发数据信息
*/
printf(" RX ucast packets:%u nucast packets:%u dropped:%u\n", netif->ifinucastpkts,
netif->ifinnucastpkts,
netif->ifindiscards);
printf(" TX ucast packets:%u nucast packets:%u dropped:%u\n", netif->ifoutucastpkts,
netif->ifoutnucastpkts,
netif->ifoutdiscards);
printf(" RX bytes:%u TX bytes:%u\n", netif->ifinoctets,
netif->ifoutoctets);
printf("\n");
}
