Added Linux support for the ipv6cp-use-persistent option.

[ppp.git] / pppd / sys-linux.c

diff --git a/pppd/sys-linux.c b/pppd/sys-linux.c
index d630bca14fab4f864aa2599701bb15619a9f6c61..c86a516f0aad475be0818e6cd167798a4fd1ad49 100644 (file)
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
@@ -2778,3 +2778,51 @@ sys_check_options(void)
     }
     return 1;
 }
+
+#ifdef INET6
+/*
+ * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
+ *
+ * convert the 48-bit MAC address of eth0 into EUI 64. caller also assumes
+ * that the system has a properly configured Ethernet interface for this
+ * function to return non-zero.
+ */
+int
+ether_to_eui64(eui64_t *p_eui64)
+{
+    struct ifreq ifr;
+    int skfd;
+    const unsigned char *ptr;
+
+    skfd = socket(PF_INET6, SOCK_DGRAM, 0);
+    if(skfd == -1)
+    {
+        warn("could not open IPv6 socket");
+        return 0;
+    }
+
+    strcpy(ifr.ifr_name, "eth0");
+    if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
+    {
+        close(skfd);
+        warn("could not obtain hardware address for eth0");
+        return 0;
+    }
+    close(skfd);
+
+    /*
+     * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
+     */
+    ptr = ifr.ifr_hwaddr.sa_data;
+    p_eui64->e8[0] = ptr[0] | 0x02;
+    p_eui64->e8[1] = ptr[1];
+    p_eui64->e8[2] = ptr[2];
+    p_eui64->e8[3] = 0xFF;
+    p_eui64->e8[4] = 0xFE;
+    p_eui64->e8[5] = ptr[3];
+    p_eui64->e8[6] = ptr[4];
+    p_eui64->e8[7] = ptr[5];
+
+    return 1;
+}
+#endif