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2004-11-25 Leon Woestenberg <leon.woestenberg@gmx.net>
* ip.c: Exploit the fact that ip_addr_isbroadcast() now checks that the given IP address actually belongs to the network of the given interface.
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@ -238,11 +238,8 @@ ip_input(struct pbuf *p, struct netif *inp) {
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{
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{
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/* unicast to this interface address? */
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/* unicast to this interface address? */
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if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
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if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
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/* or broadcast matching this interface network address? */
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/* or broadcast on this interface network address? */
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(ip_addr_isbroadcast(&(iphdr->dest), netif) &&
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ip_addr_isbroadcast(&(iphdr->dest), netif)) {
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ip_addr_netcmp(&(iphdr->dest), &(netif->ip_addr), &(netif->netmask))) ||
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/* or restricted broadcast? */
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ip_addr_cmp(&(iphdr->dest), IP_ADDR_BROADCAST)) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
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netif->name[0], netif->name[1]));
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netif->name[0], netif->name[1]));
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/* break out of for loop */
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/* break out of for loop */
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@ -60,11 +60,12 @@ u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
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/* address matches network interface address exactly? => no broadcast */
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/* address matches network interface address exactly? => no broadcast */
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else if (addr->addr == netif->ip_addr.addr)
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else if (addr->addr == netif->ip_addr.addr)
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return 0;
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return 0;
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/* on the same (sub) network and
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/* on the same (sub) network... */
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* host identifier bits are all ones? => network broadcast address */
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else if (ip_addr_netcmp(addr->addr, netif->ip_addr.addr, netif->netmask.addr))
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else if (ip_addr_netcmp(addr->addr, netif->ip_addr.addr, netif->netmask.addr))
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/* ...and host identifier bits are all ones? =>... */
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&& ((addr->addr & ~netif->netmask.addr) ==
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&& ((addr->addr & ~netif->netmask.addr) ==
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(ip_addr_broadcast.addr & ~netif->netmask.addr))
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(ip_addr_broadcast.addr & ~netif->netmask.addr))
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/* => network broadcast address */
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return 1;
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return 1;
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else
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else
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return 0;
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return 0;
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