ipconfig.c

linux 内核源代码

		}
	}

	/* We have a winner! */
	ic_dev = dev;
	ic_myaddr = b->your_ip;
	ic_servaddr = b->server_ip;
	if (ic_gateway == NONE && b->relay_ip)
		ic_gateway = b->relay_ip;
	if (ic_nameservers[0] == NONE)
		ic_nameservers[0] = ic_servaddr;
	ic_got_reply = IC_BOOTP;

drop_unlock:
	/* Show's over.  Nothing to see here.  */
	spin_unlock(&ic_recv_lock);

drop:
	/* Throw the packet out. */
	kfree_skb(skb);

	return 0;
}


#endif


/*
 *	Dynamic IP configuration -- DHCP, BOOTP, RARP.
 */

#ifdef IPCONFIG_DYNAMIC

static int __init ic_dynamic(void)
{
	int retries;
	struct ic_device *d;
	unsigned long start_jiffies, timeout, jiff;
	int do_bootp = ic_proto_have_if & IC_BOOTP;
	int do_rarp = ic_proto_have_if & IC_RARP;

	/*
	 * If none of DHCP/BOOTP/RARP was selected, return with an error.
	 * This routine gets only called when some pieces of information
	 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
	 */
	if (!ic_proto_enabled) {
		printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
		return -1;
	}

#ifdef IPCONFIG_BOOTP
	if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
		printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
#endif
#ifdef IPCONFIG_RARP
	if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
		printk(KERN_ERR "RARP: No suitable device found.\n");
#endif

	if (!ic_proto_have_if)
		/* Error message already printed */
		return -1;

	/*
	 * Setup protocols
	 */
#ifdef IPCONFIG_BOOTP
	if (do_bootp)
		ic_bootp_init();
#endif
#ifdef IPCONFIG_RARP
	if (do_rarp)
		ic_rarp_init();
#endif

	/*
	 * Send requests and wait, until we get an answer. This loop
	 * seems to be a terrible waste of CPU time, but actually there is
	 * only one process running at all, so we don't need to use any
	 * scheduler functions.
	 * [Actually we could now, but the nothing else running note still
	 *  applies.. - AC]
	 */
	printk(KERN_NOTICE "Sending %s%s%s requests .",
	       do_bootp
		? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
	       (do_bootp && do_rarp) ? " and " : "",
	       do_rarp ? "RARP" : "");

	start_jiffies = jiffies;
	d = ic_first_dev;
	retries = CONF_SEND_RETRIES;
	get_random_bytes(&timeout, sizeof(timeout));
	timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
	for (;;) {
#ifdef IPCONFIG_BOOTP
		if (do_bootp && (d->able & IC_BOOTP))
			ic_bootp_send_if(d, jiffies - start_jiffies);
#endif
#ifdef IPCONFIG_RARP
		if (do_rarp && (d->able & IC_RARP))
			ic_rarp_send_if(d);
#endif

		jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
		while (time_before(jiffies, jiff) && !ic_got_reply)
			schedule_timeout_uninterruptible(1);
#ifdef IPCONFIG_DHCP
		/* DHCP isn't done until we get a DHCPACK. */
		if ((ic_got_reply & IC_BOOTP)
		    && (ic_proto_enabled & IC_USE_DHCP)
		    && ic_dhcp_msgtype != DHCPACK)
		{
			ic_got_reply = 0;
			printk(",");
			continue;
		}
#endif /* IPCONFIG_DHCP */

		if (ic_got_reply) {
			printk(" OK\n");
			break;
		}

		if ((d = d->next))
			continue;

		if (! --retries) {
			printk(" timed out!\n");
			break;
		}

		d = ic_first_dev;

		timeout = timeout CONF_TIMEOUT_MULT;
		if (timeout > CONF_TIMEOUT_MAX)
			timeout = CONF_TIMEOUT_MAX;

		printk(".");
	}

#ifdef IPCONFIG_BOOTP
	if (do_bootp)
		ic_bootp_cleanup();
#endif
#ifdef IPCONFIG_RARP
	if (do_rarp)
		ic_rarp_cleanup();
#endif

	if (!ic_got_reply) {
		ic_myaddr = NONE;
		return -1;
	}

	printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
		((ic_got_reply & IC_RARP) ? "RARP"
		 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
		NIPQUAD(ic_servaddr));
	printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));

	return 0;
}

#endif /* IPCONFIG_DYNAMIC */

#ifdef CONFIG_PROC_FS

static int pnp_seq_show(struct seq_file *seq, void *v)
{
	int i;

	if (ic_proto_used & IC_PROTO)
		seq_printf(seq, "#PROTO: %s\n",
			   (ic_proto_used & IC_RARP) ? "RARP"
			   : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
	else
		seq_puts(seq, "#MANUAL\n");

	if (ic_domain[0])
		seq_printf(seq,
			   "domain %s\n", ic_domain);
	for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
		if (ic_nameservers[i] != NONE)
			seq_printf(seq,
				   "nameserver %u.%u.%u.%u\n",
				   NIPQUAD(ic_nameservers[i]));
	}
	if (ic_servaddr != NONE)
		seq_printf(seq,
			   "bootserver %u.%u.%u.%u\n",
			   NIPQUAD(ic_servaddr));
	return 0;
}

static int pnp_seq_open(struct inode *indoe, struct file *file)
{
	return single_open(file, pnp_seq_show, NULL);
}

static const struct file_operations pnp_seq_fops = {
	.owner		= THIS_MODULE,
	.open		= pnp_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
#endif /* CONFIG_PROC_FS */

/*
 *  Extract IP address from the parameter string if needed. Note that we
 *  need to have root_server_addr set _before_ IPConfig gets called as it
 *  can override it.
 */
__be32 __init root_nfs_parse_addr(char *name)
{
	__be32 addr;
	int octets = 0;
	char *cp, *cq;

	cp = cq = name;
	while (octets < 4) {
		while (*cp >= '0' && *cp <= '9')
			cp++;
		if (cp == cq || cp - cq > 3)
			break;
		if (*cp == '.' || octets == 3)
			octets++;
		if (octets < 4)
			cp++;
		cq = cp;
	}
	if (octets == 4 && (*cp == ':' || *cp == '\0')) {
		if (*cp == ':')
			*cp++ = '\0';
		addr = in_aton(name);
		memmove(name, cp, strlen(cp) + 1);
	} else
		addr = NONE;

	return addr;
}

/*
 *	IP Autoconfig dispatcher.
 */

static int __init ip_auto_config(void)
{
	__be32 addr;

#ifdef CONFIG_PROC_FS
	proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
#endif /* CONFIG_PROC_FS */

	if (!ic_enable)
		return 0;

	DBG(("IP-Config: Entered.\n"));
#ifdef IPCONFIG_DYNAMIC
 try_try_again:
#endif
	/* Give hardware a chance to settle */
	msleep(CONF_PRE_OPEN);

	/* Setup all network devices */
	if (ic_open_devs() < 0)
		return -1;

	/* Give drivers a chance to settle */
	ssleep(CONF_POST_OPEN);

	/*
	 * If the config information is insufficient (e.g., our IP address or
	 * IP address of the boot server is missing or we have multiple network
	 * interfaces and no default was set), use BOOTP or RARP to get the
	 * missing values.
	 */
	if (ic_myaddr == NONE ||
#ifdef CONFIG_ROOT_NFS
	    (root_server_addr == NONE
	     && ic_servaddr == NONE
	     && ROOT_DEV == Root_NFS) ||
#endif
	    ic_first_dev->next) {
#ifdef IPCONFIG_DYNAMIC

		int retries = CONF_OPEN_RETRIES;

		if (ic_dynamic() < 0) {
			ic_close_devs();

			/*
			 * I don't know why, but sometimes the
			 * eepro100 driver (at least) gets upset and
			 * doesn't work the first time it's opened.
			 * But then if you close it and reopen it, it
			 * works just fine.  So we need to try that at
			 * least once before giving up.
			 *
			 * Also, if the root will be NFS-mounted, we
			 * have nowhere to go if DHCP fails.  So we
			 * just have to keep trying forever.
			 *
			 * 				-- Chip
			 */
#ifdef CONFIG_ROOT_NFS
			if (ROOT_DEV ==  Root_NFS) {
				printk(KERN_ERR
					"IP-Config: Retrying forever (NFS root)...\n");
				goto try_try_again;
			}
#endif

			if (--retries) {
				printk(KERN_ERR
				       "IP-Config: Reopening network devices...\n");
				goto try_try_again;
			}

			/* Oh, well.  At least we tried. */
			printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
			return -1;
		}
#else /* !DYNAMIC */
		printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
		ic_close_devs();
		return -1;
#endif /* IPCONFIG_DYNAMIC */
	} else {
		/* Device selected manually or only one device -> use it */
		ic_dev = ic_first_dev->dev;
	}

	addr = root_nfs_parse_addr(root_server_path);
	if (root_server_addr == NONE)
		root_server_addr = addr;

	/*
	 * Use defaults whereever applicable.
	 */
	if (ic_defaults() < 0)
		return -1;

	/*
	 * Close all network devices except the device we've
	 * autoconfigured and set up routes.
	 */
	ic_close_devs();
	if (ic_setup_if() < 0 || ic_setup_routes() < 0)
		return -1;

	/*
	 * Record which protocol was actually used.
	 */
#ifdef IPCONFIG_DYNAMIC
	ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
#endif

#ifndef IPCONFIG_SILENT
	/*
	 * Clue in the operator.
	 */
	printk("IP-Config: Complete:");
	printk("\n      device=%s", ic_dev->name);
	printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
	printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
	printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
	printk(",\n     host=%s, domain=%s, nis-domain=%s",
	       utsname()->nodename, ic_domain, utsname()->domainname);
	printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
	printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
	printk(", rootpath=%s", root_server_path);
	printk("\n");
#endif /* !SILENT */

	return 0;
}

late_initcall(ip_auto_config);


/*
 *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
 *  command line parameter.  See Documentation/nfsroot.txt.
 */
static int __init ic_proto_name(char *name)
{
	if (!strcmp(name, "on") || !strcmp(name, "any")) {
		return 1;
	}
	if (!strcmp(name, "off") || !strcmp(name, "none")) {
		return 0;
	}
#ifdef CONFIG_IP_PNP_DHCP
	else if (!strcmp(name, "dhcp")) {
		ic_proto_enabled &= ~IC_RARP;
		return 1;
	}
#endif
#ifdef CONFIG_IP_PNP_BOOTP
	else if (!strcmp(name, "bootp")) {
		ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
		return 1;
	}
#endif
#ifdef CONFIG_IP_PNP_RARP
	else if (!strcmp(name, "rarp")) {
		ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
		return 1;
	}
#endif
#ifdef IPCONFIG_DYNAMIC
	else if (!strcmp(name, "both")) {
		ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
		return 1;
	}
#endif
	return 0;
}

static int __init ip_auto_config_setup(char *addrs)
{
	char *cp, *ip, *dp;
	int num = 0;

	ic_set_manually = 1;
	ic_enable = 1;

	/*
	 * If any dhcp, bootp etc options are set, leave autoconfig on
	 * and skip the below static IP processing.
	 */
	if (ic_proto_name(addrs))
		return 1;

	/* If no static IP is given, turn off autoconfig and bail.  */
	if (*addrs == 0 ||
	    strcmp(addrs, "off") == 0 ||
	    strcmp(addrs, "none") == 0) {
		ic_enable = 0;
		return 1;
	}

	/* Parse string for static IP assignment.  */
	ip = addrs;
	while (ip && *ip) {
		if ((cp = strchr(ip, ':')))
			*cp++ = '\0';
		if (strlen(ip) > 0) {
			DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
			switch (num) {
			case 0:
				if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
					ic_myaddr = NONE;
				break;
			case 1:
				if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
					ic_servaddr = NONE;
				break;
			case 2:
				if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
					ic_gateway = NONE;
				break;
			case 3:
				if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
					ic_netmask = NONE;
				break;
			case 4:
				if ((dp = strchr(ip, '.'))) {
					*dp++ = '\0';
					strlcpy(utsname()->domainname, dp,
						sizeof(utsname()->domainname));
				}
				strlcpy(utsname()->nodename, ip,
					sizeof(utsname()->nodename));
				ic_host_name_set = 1;
				break;
			case 5:
				strlcpy(user_dev_name, ip, sizeof(user_dev_name));
				break;
			case 6:
				if (ic_proto_name(ip) == 0 &&
				    ic_myaddr == NONE) {
					ic_enable = 0;
				}
				break;
			}
		}
		ip = cp;
		num++;
	}

	return 1;
}

static int __init nfsaddrs_config_setup(char *addrs)
{
	return ip_auto_config_setup(addrs);
}

__setup("ip=", ip_auto_config_setup);
__setup("nfsaddrs=", nfsaddrs_config_setup);