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-rw-r--r--net/ipv4/devinet.c1508
1 files changed, 1508 insertions, 0 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
new file mode 100644
index 000000000000..eea7ef010776
--- /dev/null
+++ b/net/ipv4/devinet.c
@@ -0,0 +1,1508 @@
+/*
+ * NET3 IP device support routines.
+ *
+ * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Derived from the IP parts of dev.c 1.0.19
+ * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ * Mark Evans, <evansmp@uhura.aston.ac.uk>
+ *
+ * Additional Authors:
+ * Alan Cox, <gw4pts@gw4pts.ampr.org>
+ * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * Changes:
+ * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
+ * lists.
+ * Cyrus Durgin: updated for kmod
+ * Matthias Andree: in devinet_ioctl, compare label and
+ * address (4.4BSD alias style support),
+ * fall back to comparing just the label
+ * if no match found.
+ */
+
+#include <linux/config.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/init.h>
+#include <linux/notifier.h>
+#include <linux/inetdevice.h>
+#include <linux/igmp.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+#include <linux/kmod.h>
+
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/ip_fib.h>
+
+struct ipv4_devconf ipv4_devconf = {
+ .accept_redirects = 1,
+ .send_redirects = 1,
+ .secure_redirects = 1,
+ .shared_media = 1,
+};
+
+static struct ipv4_devconf ipv4_devconf_dflt = {
+ .accept_redirects = 1,
+ .send_redirects = 1,
+ .secure_redirects = 1,
+ .shared_media = 1,
+ .accept_source_route = 1,
+};
+
+static void rtmsg_ifa(int event, struct in_ifaddr *);
+
+static struct notifier_block *inetaddr_chain;
+static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
+ int destroy);
+#ifdef CONFIG_SYSCTL
+static void devinet_sysctl_register(struct in_device *in_dev,
+ struct ipv4_devconf *p);
+static void devinet_sysctl_unregister(struct ipv4_devconf *p);
+#endif
+
+/* Locks all the inet devices. */
+
+static struct in_ifaddr *inet_alloc_ifa(void)
+{
+ struct in_ifaddr *ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
+
+ if (ifa) {
+ memset(ifa, 0, sizeof(*ifa));
+ INIT_RCU_HEAD(&ifa->rcu_head);
+ }
+
+ return ifa;
+}
+
+static void inet_rcu_free_ifa(struct rcu_head *head)
+{
+ struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
+ if (ifa->ifa_dev)
+ in_dev_put(ifa->ifa_dev);
+ kfree(ifa);
+}
+
+static inline void inet_free_ifa(struct in_ifaddr *ifa)
+{
+ call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
+}
+
+void in_dev_finish_destroy(struct in_device *idev)
+{
+ struct net_device *dev = idev->dev;
+
+ BUG_TRAP(!idev->ifa_list);
+ BUG_TRAP(!idev->mc_list);
+#ifdef NET_REFCNT_DEBUG
+ printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
+ idev, dev ? dev->name : "NIL");
+#endif
+ dev_put(dev);
+ if (!idev->dead)
+ printk("Freeing alive in_device %p\n", idev);
+ else {
+ kfree(idev);
+ }
+}
+
+struct in_device *inetdev_init(struct net_device *dev)
+{
+ struct in_device *in_dev;
+
+ ASSERT_RTNL();
+
+ in_dev = kmalloc(sizeof(*in_dev), GFP_KERNEL);
+ if (!in_dev)
+ goto out;
+ memset(in_dev, 0, sizeof(*in_dev));
+ INIT_RCU_HEAD(&in_dev->rcu_head);
+ memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf));
+ in_dev->cnf.sysctl = NULL;
+ in_dev->dev = dev;
+ if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
+ goto out_kfree;
+ /* Reference in_dev->dev */
+ dev_hold(dev);
+#ifdef CONFIG_SYSCTL
+ neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
+ NET_IPV4_NEIGH, "ipv4", NULL, NULL);
+#endif
+
+ /* Account for reference dev->ip_ptr */
+ in_dev_hold(in_dev);
+ rcu_assign_pointer(dev->ip_ptr, in_dev);
+
+#ifdef CONFIG_SYSCTL
+ devinet_sysctl_register(in_dev, &in_dev->cnf);
+#endif
+ ip_mc_init_dev(in_dev);
+ if (dev->flags & IFF_UP)
+ ip_mc_up(in_dev);
+out:
+ return in_dev;
+out_kfree:
+ kfree(in_dev);
+ in_dev = NULL;
+ goto out;
+}
+
+static void in_dev_rcu_put(struct rcu_head *head)
+{
+ struct in_device *idev = container_of(head, struct in_device, rcu_head);
+ in_dev_put(idev);
+}
+
+static void inetdev_destroy(struct in_device *in_dev)
+{
+ struct in_ifaddr *ifa;
+ struct net_device *dev;
+
+ ASSERT_RTNL();
+
+ dev = in_dev->dev;
+ if (dev == &loopback_dev)
+ return;
+
+ in_dev->dead = 1;
+
+ ip_mc_destroy_dev(in_dev);
+
+ while ((ifa = in_dev->ifa_list) != NULL) {
+ inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
+ inet_free_ifa(ifa);
+ }
+
+#ifdef CONFIG_SYSCTL
+ devinet_sysctl_unregister(&in_dev->cnf);
+#endif
+
+ dev->ip_ptr = NULL;
+
+#ifdef CONFIG_SYSCTL
+ neigh_sysctl_unregister(in_dev->arp_parms);
+#endif
+ neigh_parms_release(&arp_tbl, in_dev->arp_parms);
+ arp_ifdown(dev);
+
+ call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
+}
+
+int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b)
+{
+ rcu_read_lock();
+ for_primary_ifa(in_dev) {
+ if (inet_ifa_match(a, ifa)) {
+ if (!b || inet_ifa_match(b, ifa)) {
+ rcu_read_unlock();
+ return 1;
+ }
+ }
+ } endfor_ifa(in_dev);
+ rcu_read_unlock();
+ return 0;
+}
+
+static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
+ int destroy)
+{
+ struct in_ifaddr *ifa1 = *ifap;
+
+ ASSERT_RTNL();
+
+ /* 1. Deleting primary ifaddr forces deletion all secondaries */
+
+ if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
+ struct in_ifaddr *ifa;
+ struct in_ifaddr **ifap1 = &ifa1->ifa_next;
+
+ while ((ifa = *ifap1) != NULL) {
+ if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
+ ifa1->ifa_mask != ifa->ifa_mask ||
+ !inet_ifa_match(ifa1->ifa_address, ifa)) {
+ ifap1 = &ifa->ifa_next;
+ continue;
+ }
+
+ *ifap1 = ifa->ifa_next;
+
+ rtmsg_ifa(RTM_DELADDR, ifa);
+ notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa);
+ inet_free_ifa(ifa);
+ }
+ }
+
+ /* 2. Unlink it */
+
+ *ifap = ifa1->ifa_next;
+
+ /* 3. Announce address deletion */
+
+ /* Send message first, then call notifier.
+ At first sight, FIB update triggered by notifier
+ will refer to already deleted ifaddr, that could confuse
+ netlink listeners. It is not true: look, gated sees
+ that route deleted and if it still thinks that ifaddr
+ is valid, it will try to restore deleted routes... Grr.
+ So that, this order is correct.
+ */
+ rtmsg_ifa(RTM_DELADDR, ifa1);
+ notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
+ if (destroy) {
+ inet_free_ifa(ifa1);
+
+ if (!in_dev->ifa_list)
+ inetdev_destroy(in_dev);
+ }
+}
+
+static int inet_insert_ifa(struct in_ifaddr *ifa)
+{
+ struct in_device *in_dev = ifa->ifa_dev;
+ struct in_ifaddr *ifa1, **ifap, **last_primary;
+
+ ASSERT_RTNL();
+
+ if (!ifa->ifa_local) {
+ inet_free_ifa(ifa);
+ return 0;
+ }
+
+ ifa->ifa_flags &= ~IFA_F_SECONDARY;
+ last_primary = &in_dev->ifa_list;
+
+ for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
+ ifap = &ifa1->ifa_next) {
+ if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
+ ifa->ifa_scope <= ifa1->ifa_scope)
+ last_primary = &ifa1->ifa_next;
+ if (ifa1->ifa_mask == ifa->ifa_mask &&
+ inet_ifa_match(ifa1->ifa_address, ifa)) {
+ if (ifa1->ifa_local == ifa->ifa_local) {
+ inet_free_ifa(ifa);
+ return -EEXIST;
+ }
+ if (ifa1->ifa_scope != ifa->ifa_scope) {
+ inet_free_ifa(ifa);
+ return -EINVAL;
+ }
+ ifa->ifa_flags |= IFA_F_SECONDARY;
+ }
+ }
+
+ if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
+ net_srandom(ifa->ifa_local);
+ ifap = last_primary;
+ }
+
+ ifa->ifa_next = *ifap;
+ *ifap = ifa;
+
+ /* Send message first, then call notifier.
+ Notifier will trigger FIB update, so that
+ listeners of netlink will know about new ifaddr */
+ rtmsg_ifa(RTM_NEWADDR, ifa);
+ notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
+
+ return 0;
+}
+
+static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
+{
+ struct in_device *in_dev = __in_dev_get(dev);
+
+ ASSERT_RTNL();
+
+ if (!in_dev) {
+ in_dev = inetdev_init(dev);
+ if (!in_dev) {
+ inet_free_ifa(ifa);
+ return -ENOBUFS;
+ }
+ }
+ if (ifa->ifa_dev != in_dev) {
+ BUG_TRAP(!ifa->ifa_dev);
+ in_dev_hold(in_dev);
+ ifa->ifa_dev = in_dev;
+ }
+ if (LOOPBACK(ifa->ifa_local))
+ ifa->ifa_scope = RT_SCOPE_HOST;
+ return inet_insert_ifa(ifa);
+}
+
+struct in_device *inetdev_by_index(int ifindex)
+{
+ struct net_device *dev;
+ struct in_device *in_dev = NULL;
+ read_lock(&dev_base_lock);
+ dev = __dev_get_by_index(ifindex);
+ if (dev)
+ in_dev = in_dev_get(dev);
+ read_unlock(&dev_base_lock);
+ return in_dev;
+}
+
+/* Called only from RTNL semaphored context. No locks. */
+
+struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix,
+ u32 mask)
+{
+ ASSERT_RTNL();
+
+ for_primary_ifa(in_dev) {
+ if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
+ return ifa;
+ } endfor_ifa(in_dev);
+ return NULL;
+}
+
+static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct in_device *in_dev;
+ struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
+ struct in_ifaddr *ifa, **ifap;
+
+ ASSERT_RTNL();
+
+ if ((in_dev = inetdev_by_index(ifm->ifa_index)) == NULL)
+ goto out;
+ __in_dev_put(in_dev);
+
+ for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
+ ifap = &ifa->ifa_next) {
+ if ((rta[IFA_LOCAL - 1] &&
+ memcmp(RTA_DATA(rta[IFA_LOCAL - 1]),
+ &ifa->ifa_local, 4)) ||
+ (rta[IFA_LABEL - 1] &&
+ rtattr_strcmp(rta[IFA_LABEL - 1], ifa->ifa_label)) ||
+ (rta[IFA_ADDRESS - 1] &&
+ (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
+ !inet_ifa_match(*(u32*)RTA_DATA(rta[IFA_ADDRESS - 1]),
+ ifa))))
+ continue;
+ inet_del_ifa(in_dev, ifap, 1);
+ return 0;
+ }
+out:
+ return -EADDRNOTAVAIL;
+}
+
+static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct net_device *dev;
+ struct in_device *in_dev;
+ struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
+ struct in_ifaddr *ifa;
+ int rc = -EINVAL;
+
+ ASSERT_RTNL();
+
+ if (ifm->ifa_prefixlen > 32 || !rta[IFA_LOCAL - 1])
+ goto out;
+
+ rc = -ENODEV;
+ if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
+ goto out;
+
+ rc = -ENOBUFS;
+ if ((in_dev = __in_dev_get(dev)) == NULL) {
+ in_dev = inetdev_init(dev);
+ if (!in_dev)
+ goto out;
+ }
+
+ if ((ifa = inet_alloc_ifa()) == NULL)
+ goto out;
+
+ if (!rta[IFA_ADDRESS - 1])
+ rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
+ memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL - 1]), 4);
+ memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS - 1]), 4);
+ ifa->ifa_prefixlen = ifm->ifa_prefixlen;
+ ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
+ if (rta[IFA_BROADCAST - 1])
+ memcpy(&ifa->ifa_broadcast,
+ RTA_DATA(rta[IFA_BROADCAST - 1]), 4);
+ if (rta[IFA_ANYCAST - 1])
+ memcpy(&ifa->ifa_anycast, RTA_DATA(rta[IFA_ANYCAST - 1]), 4);
+ ifa->ifa_flags = ifm->ifa_flags;
+ ifa->ifa_scope = ifm->ifa_scope;
+ in_dev_hold(in_dev);
+ ifa->ifa_dev = in_dev;
+ if (rta[IFA_LABEL - 1])
+ rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL - 1], IFNAMSIZ);
+ else
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+
+ rc = inet_insert_ifa(ifa);
+out:
+ return rc;
+}
+
+/*
+ * Determine a default network mask, based on the IP address.
+ */
+
+static __inline__ int inet_abc_len(u32 addr)
+{
+ int rc = -1; /* Something else, probably a multicast. */
+
+ if (ZERONET(addr))
+ rc = 0;
+ else {
+ addr = ntohl(addr);
+
+ if (IN_CLASSA(addr))
+ rc = 8;
+ else if (IN_CLASSB(addr))
+ rc = 16;
+ else if (IN_CLASSC(addr))
+ rc = 24;
+ }
+
+ return rc;
+}
+
+
+int devinet_ioctl(unsigned int cmd, void __user *arg)
+{
+ struct ifreq ifr;
+ struct sockaddr_in sin_orig;
+ struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
+ struct in_device *in_dev;
+ struct in_ifaddr **ifap = NULL;
+ struct in_ifaddr *ifa = NULL;
+ struct net_device *dev;
+ char *colon;
+ int ret = -EFAULT;
+ int tryaddrmatch = 0;
+
+ /*
+ * Fetch the caller's info block into kernel space
+ */
+
+ if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+ goto out;
+ ifr.ifr_name[IFNAMSIZ - 1] = 0;
+
+ /* save original address for comparison */
+ memcpy(&sin_orig, sin, sizeof(*sin));
+
+ colon = strchr(ifr.ifr_name, ':');
+ if (colon)
+ *colon = 0;
+
+#ifdef CONFIG_KMOD
+ dev_load(ifr.ifr_name);
+#endif
+
+ switch(cmd) {
+ case SIOCGIFADDR: /* Get interface address */
+ case SIOCGIFBRDADDR: /* Get the broadcast address */
+ case SIOCGIFDSTADDR: /* Get the destination address */
+ case SIOCGIFNETMASK: /* Get the netmask for the interface */
+ /* Note that these ioctls will not sleep,
+ so that we do not impose a lock.
+ One day we will be forced to put shlock here (I mean SMP)
+ */
+ tryaddrmatch = (sin_orig.sin_family == AF_INET);
+ memset(sin, 0, sizeof(*sin));
+ sin->sin_family = AF_INET;
+ break;
+
+ case SIOCSIFFLAGS:
+ ret = -EACCES;
+ if (!capable(CAP_NET_ADMIN))
+ goto out;
+ break;
+ case SIOCSIFADDR: /* Set interface address (and family) */
+ case SIOCSIFBRDADDR: /* Set the broadcast address */
+ case SIOCSIFDSTADDR: /* Set the destination address */
+ case SIOCSIFNETMASK: /* Set the netmask for the interface */
+ ret = -EACCES;
+ if (!capable(CAP_NET_ADMIN))
+ goto out;
+ ret = -EINVAL;
+ if (sin->sin_family != AF_INET)
+ goto out;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ rtnl_lock();
+
+ ret = -ENODEV;
+ if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL)
+ goto done;
+
+ if (colon)
+ *colon = ':';
+
+ if ((in_dev = __in_dev_get(dev)) != NULL) {
+ if (tryaddrmatch) {
+ /* Matthias Andree */
+ /* compare label and address (4.4BSD style) */
+ /* note: we only do this for a limited set of ioctls
+ and only if the original address family was AF_INET.
+ This is checked above. */
+ for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
+ ifap = &ifa->ifa_next) {
+ if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
+ sin_orig.sin_addr.s_addr ==
+ ifa->ifa_address) {
+ break; /* found */
+ }
+ }
+ }
+ /* we didn't get a match, maybe the application is
+ 4.3BSD-style and passed in junk so we fall back to
+ comparing just the label */
+ if (!ifa) {
+ for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
+ ifap = &ifa->ifa_next)
+ if (!strcmp(ifr.ifr_name, ifa->ifa_label))
+ break;
+ }
+ }
+
+ ret = -EADDRNOTAVAIL;
+ if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
+ goto done;
+
+ switch(cmd) {
+ case SIOCGIFADDR: /* Get interface address */
+ sin->sin_addr.s_addr = ifa->ifa_local;
+ goto rarok;
+
+ case SIOCGIFBRDADDR: /* Get the broadcast address */
+ sin->sin_addr.s_addr = ifa->ifa_broadcast;
+ goto rarok;
+
+ case SIOCGIFDSTADDR: /* Get the destination address */
+ sin->sin_addr.s_addr = ifa->ifa_address;
+ goto rarok;
+
+ case SIOCGIFNETMASK: /* Get the netmask for the interface */
+ sin->sin_addr.s_addr = ifa->ifa_mask;
+ goto rarok;
+
+ case SIOCSIFFLAGS:
+ if (colon) {
+ ret = -EADDRNOTAVAIL;
+ if (!ifa)
+ break;
+ ret = 0;
+ if (!(ifr.ifr_flags & IFF_UP))
+ inet_del_ifa(in_dev, ifap, 1);
+ break;
+ }
+ ret = dev_change_flags(dev, ifr.ifr_flags);
+ break;
+
+ case SIOCSIFADDR: /* Set interface address (and family) */
+ ret = -EINVAL;
+ if (inet_abc_len(sin->sin_addr.s_addr) < 0)
+ break;
+
+ if (!ifa) {
+ ret = -ENOBUFS;
+ if ((ifa = inet_alloc_ifa()) == NULL)
+ break;
+ if (colon)
+ memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
+ else
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+ } else {
+ ret = 0;
+ if (ifa->ifa_local == sin->sin_addr.s_addr)
+ break;
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_broadcast = 0;
+ ifa->ifa_anycast = 0;
+ }
+
+ ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
+
+ if (!(dev->flags & IFF_POINTOPOINT)) {
+ ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
+ ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
+ if ((dev->flags & IFF_BROADCAST) &&
+ ifa->ifa_prefixlen < 31)
+ ifa->ifa_broadcast = ifa->ifa_address |
+ ~ifa->ifa_mask;
+ } else {
+ ifa->ifa_prefixlen = 32;
+ ifa->ifa_mask = inet_make_mask(32);
+ }
+ ret = inet_set_ifa(dev, ifa);
+ break;
+
+ case SIOCSIFBRDADDR: /* Set the broadcast address */
+ ret = 0;
+ if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_broadcast = sin->sin_addr.s_addr;
+ inet_insert_ifa(ifa);
+ }
+ break;
+
+ case SIOCSIFDSTADDR: /* Set the destination address */
+ ret = 0;
+ if (ifa->ifa_address == sin->sin_addr.s_addr)
+ break;
+ ret = -EINVAL;
+ if (inet_abc_len(sin->sin_addr.s_addr) < 0)
+ break;
+ ret = 0;
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_address = sin->sin_addr.s_addr;
+ inet_insert_ifa(ifa);
+ break;
+
+ case SIOCSIFNETMASK: /* Set the netmask for the interface */
+
+ /*
+ * The mask we set must be legal.
+ */
+ ret = -EINVAL;
+ if (bad_mask(sin->sin_addr.s_addr, 0))
+ break;
+ ret = 0;
+ if (ifa->ifa_mask != sin->sin_addr.s_addr) {
+ inet_del_ifa(in_dev, ifap, 0);
+ ifa->ifa_mask = sin->sin_addr.s_addr;
+ ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
+
+ /* See if current broadcast address matches
+ * with current netmask, then recalculate
+ * the broadcast address. Otherwise it's a
+ * funny address, so don't touch it since
+ * the user seems to know what (s)he's doing...
+ */
+ if ((dev->flags & IFF_BROADCAST) &&
+ (ifa->ifa_prefixlen < 31) &&
+ (ifa->ifa_broadcast ==
+ (ifa->ifa_local|~ifa->ifa_mask))) {
+ ifa->ifa_broadcast = (ifa->ifa_local |
+ ~sin->sin_addr.s_addr);
+ }
+ inet_insert_ifa(ifa);
+ }
+ break;
+ }
+done:
+ rtnl_unlock();
+out:
+ return ret;
+rarok:
+ rtnl_unlock();
+ ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
+ goto out;
+}
+
+static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
+{
+ struct in_device *in_dev = __in_dev_get(dev);
+ struct in_ifaddr *ifa;
+ struct ifreq ifr;
+ int done = 0;
+
+ if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
+ goto out;
+
+ for (; ifa; ifa = ifa->ifa_next) {
+ if (!buf) {
+ done += sizeof(ifr);
+ continue;
+ }
+ if (len < (int) sizeof(ifr))
+ break;
+ memset(&ifr, 0, sizeof(struct ifreq));
+ if (ifa->ifa_label)
+ strcpy(ifr.ifr_name, ifa->ifa_label);
+ else
+ strcpy(ifr.ifr_name, dev->name);
+
+ (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
+ (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
+ ifa->ifa_local;
+
+ if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
+ done = -EFAULT;
+ break;
+ }
+ buf += sizeof(struct ifreq);
+ len -= sizeof(struct ifreq);
+ done += sizeof(struct ifreq);
+ }
+out:
+ return done;
+}
+
+u32 inet_select_addr(const struct net_device *dev, u32 dst, int scope)
+{
+ u32 addr = 0;
+ struct in_device *in_dev;
+
+ rcu_read_lock();
+ in_dev = __in_dev_get(dev);
+ if (!in_dev)
+ goto no_in_dev;
+
+ for_primary_ifa(in_dev) {
+ if (ifa->ifa_scope > scope)
+ continue;
+ if (!dst || inet_ifa_match(dst, ifa)) {
+ addr = ifa->ifa_local;
+ break;
+ }
+ if (!addr)
+ addr = ifa->ifa_local;
+ } endfor_ifa(in_dev);
+no_in_dev:
+ rcu_read_unlock();
+
+ if (addr)
+ goto out;
+
+ /* Not loopback addresses on loopback should be preferred
+ in this case. It is importnat that lo is the first interface
+ in dev_base list.
+ */
+ read_lock(&dev_base_lock);
+ rcu_read_lock();
+ for (dev = dev_base; dev; dev = dev->next) {
+ if ((in_dev = __in_dev_get(dev)) == NULL)
+ continue;
+
+ for_primary_ifa(in_dev) {
+ if (ifa->ifa_scope != RT_SCOPE_LINK &&
+ ifa->ifa_scope <= scope) {
+ addr = ifa->ifa_local;
+ goto out_unlock_both;
+ }
+ } endfor_ifa(in_dev);
+ }
+out_unlock_both:
+ read_unlock(&dev_base_lock);
+ rcu_read_unlock();
+out:
+ return addr;
+}
+
+static u32 confirm_addr_indev(struct in_device *in_dev, u32 dst,
+ u32 local, int scope)
+{
+ int same = 0;
+ u32 addr = 0;
+
+ for_ifa(in_dev) {
+ if (!addr &&
+ (local == ifa->ifa_local || !local) &&
+ ifa->ifa_scope <= scope) {
+ addr = ifa->ifa_local;
+ if (same)
+ break;
+ }
+ if (!same) {
+ same = (!local || inet_ifa_match(local, ifa)) &&
+ (!dst || inet_ifa_match(dst, ifa));
+ if (same && addr) {
+ if (local || !dst)
+ break;
+ /* Is the selected addr into dst subnet? */
+ if (inet_ifa_match(addr, ifa))
+ break;
+ /* No, then can we use new local src? */
+ if (ifa->ifa_scope <= scope) {
+ addr = ifa->ifa_local;
+ break;
+ }
+ /* search for large dst subnet for addr */
+ same = 0;
+ }
+ }
+ } endfor_ifa(in_dev);
+
+ return same? addr : 0;
+}
+
+/*
+ * Confirm that local IP address exists using wildcards:
+ * - dev: only on this interface, 0=any interface
+ * - dst: only in the same subnet as dst, 0=any dst
+ * - local: address, 0=autoselect the local address
+ * - scope: maximum allowed scope value for the local address
+ */
+u32 inet_confirm_addr(const struct net_device *dev, u32 dst, u32 local, int scope)
+{
+ u32 addr = 0;
+ struct in_device *in_dev;
+
+ if (dev) {
+ rcu_read_lock();
+ if ((in_dev = __in_dev_get(dev)))
+ addr = confirm_addr_indev(in_dev, dst, local, scope);
+ rcu_read_unlock();
+
+ return addr;
+ }
+
+ read_lock(&dev_base_lock);
+ rcu_read_lock();
+ for (dev = dev_base; dev; dev = dev->next) {
+ if ((in_dev = __in_dev_get(dev))) {
+ addr = confirm_addr_indev(in_dev, dst, local, scope);
+ if (addr)
+ break;
+ }
+ }
+ rcu_read_unlock();
+ read_unlock(&dev_base_lock);
+
+ return addr;
+}
+
+/*
+ * Device notifier
+ */
+
+int register_inetaddr_notifier(struct notifier_block *nb)
+{
+ return notifier_chain_register(&inetaddr_chain, nb);
+}
+
+int unregister_inetaddr_notifier(struct notifier_block *nb)
+{
+ return notifier_chain_unregister(&inetaddr_chain, nb);
+}
+
+/* Rename ifa_labels for a device name change. Make some effort to preserve existing
+ * alias numbering and to create unique labels if possible.
+*/
+static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
+{
+ struct in_ifaddr *ifa;
+ int named = 0;
+
+ for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+ char old[IFNAMSIZ], *dot;
+
+ memcpy(old, ifa->ifa_label, IFNAMSIZ);
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+ if (named++ == 0)
+ continue;
+ dot = strchr(ifa->ifa_label, ':');
+ if (dot == NULL) {
+ sprintf(old, ":%d", named);
+ dot = old;
+ }
+ if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
+ strcat(ifa->ifa_label, dot);
+ } else {
+ strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
+ }
+ }
+}
+
+/* Called only under RTNL semaphore */
+
+static int inetdev_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = ptr;
+ struct in_device *in_dev = __in_dev_get(dev);
+
+ ASSERT_RTNL();
+
+ if (!in_dev) {
+ if (event == NETDEV_REGISTER && dev == &loopback_dev) {
+ in_dev = inetdev_init(dev);
+ if (!in_dev)
+ panic("devinet: Failed to create loopback\n");
+ in_dev->cnf.no_xfrm = 1;
+ in_dev->cnf.no_policy = 1;
+ }
+ goto out;
+ }
+
+ switch (event) {
+ case NETDEV_REGISTER:
+ printk(KERN_DEBUG "inetdev_event: bug\n");
+ dev->ip_ptr = NULL;
+ break;
+ case NETDEV_UP:
+ if (dev->mtu < 68)
+ break;
+ if (dev == &loopback_dev) {
+ struct in_ifaddr *ifa;
+ if ((ifa = inet_alloc_ifa()) != NULL) {
+ ifa->ifa_local =
+ ifa->ifa_address = htonl(INADDR_LOOPBACK);
+ ifa->ifa_prefixlen = 8;
+ ifa->ifa_mask = inet_make_mask(8);
+ in_dev_hold(in_dev);
+ ifa->ifa_dev = in_dev;
+ ifa->ifa_scope = RT_SCOPE_HOST;
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+ inet_insert_ifa(ifa);
+ }
+ }
+ ip_mc_up(in_dev);
+ break;
+ case NETDEV_DOWN:
+ ip_mc_down(in_dev);
+ break;
+ case NETDEV_CHANGEMTU:
+ if (dev->mtu >= 68)
+ break;
+ /* MTU falled under 68, disable IP */
+ case NETDEV_UNREGISTER:
+ inetdev_destroy(in_dev);
+ break;
+ case NETDEV_CHANGENAME:
+ /* Do not notify about label change, this event is
+ * not interesting to applications using netlink.
+ */
+ inetdev_changename(dev, in_dev);
+
+#ifdef CONFIG_SYSCTL
+ devinet_sysctl_unregister(&in_dev->cnf);
+ neigh_sysctl_unregister(in_dev->arp_parms);
+ neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
+ NET_IPV4_NEIGH, "ipv4", NULL, NULL);
+ devinet_sysctl_register(in_dev, &in_dev->cnf);
+#endif
+ break;
+ }
+out:
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block ip_netdev_notifier = {
+ .notifier_call =inetdev_event,
+};
+
+static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
+ u32 pid, u32 seq, int event)
+{
+ struct ifaddrmsg *ifm;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+
+ nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
+ if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
+ ifm = NLMSG_DATA(nlh);
+ ifm->ifa_family = AF_INET;
+ ifm->ifa_prefixlen = ifa->ifa_prefixlen;
+ ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
+ ifm->ifa_scope = ifa->ifa_scope;
+ ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
+ if (ifa->ifa_address)
+ RTA_PUT(skb, IFA_ADDRESS, 4, &ifa->ifa_address);
+ if (ifa->ifa_local)
+ RTA_PUT(skb, IFA_LOCAL, 4, &ifa->ifa_local);
+ if (ifa->ifa_broadcast)
+ RTA_PUT(skb, IFA_BROADCAST, 4, &ifa->ifa_broadcast);
+ if (ifa->ifa_anycast)
+ RTA_PUT(skb, IFA_ANYCAST, 4, &ifa->ifa_anycast);
+ if (ifa->ifa_label[0])
+ RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx, ip_idx;
+ struct net_device *dev;
+ struct in_device *in_dev;
+ struct in_ifaddr *ifa;
+ int s_ip_idx, s_idx = cb->args[0];
+
+ s_ip_idx = ip_idx = cb->args[1];
+ read_lock(&dev_base_lock);
+ for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
+ if (idx < s_idx)
+ continue;
+ if (idx > s_idx)
+ s_ip_idx = 0;
+ rcu_read_lock();
+ if ((in_dev = __in_dev_get(dev)) == NULL) {
+ rcu_read_unlock();
+ continue;
+ }
+
+ for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
+ ifa = ifa->ifa_next, ip_idx++) {
+ if (ip_idx < s_ip_idx)
+ continue;
+ if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWADDR) <= 0) {
+ rcu_read_unlock();
+ goto done;
+ }
+ }
+ rcu_read_unlock();
+ }
+
+done:
+ read_unlock(&dev_base_lock);
+ cb->args[0] = idx;
+ cb->args[1] = ip_idx;
+
+ return skb->len;
+}
+
+static void rtmsg_ifa(int event, struct in_ifaddr* ifa)
+{
+ int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + 128);
+ struct sk_buff *skb = alloc_skb(size, GFP_KERNEL);
+
+ if (!skb)
+ netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, ENOBUFS);
+ else if (inet_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
+ kfree_skb(skb);
+ netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, EINVAL);
+ } else {
+ NETLINK_CB(skb).dst_groups = RTMGRP_IPV4_IFADDR;
+ netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV4_IFADDR, GFP_KERNEL);
+ }
+}
+
+static struct rtnetlink_link inet_rtnetlink_table[RTM_MAX - RTM_BASE + 1] = {
+ [4] = { .doit = inet_rtm_newaddr, },
+ [5] = { .doit = inet_rtm_deladdr, },
+ [6] = { .dumpit = inet_dump_ifaddr, },
+ [8] = { .doit = inet_rtm_newroute, },
+ [9] = { .doit = inet_rtm_delroute, },
+ [10] = { .doit = inet_rtm_getroute, .dumpit = inet_dump_fib, },
+#ifdef CONFIG_IP_MULTIPLE_TABLES
+ [16] = { .doit = inet_rtm_newrule, },
+ [17] = { .doit = inet_rtm_delrule, },
+ [18] = { .dumpit = inet_dump_rules, },
+#endif
+};
+
+#ifdef CONFIG_SYSCTL
+
+void inet_forward_change(void)
+{
+ struct net_device *dev;
+ int on = ipv4_devconf.forwarding;
+
+ ipv4_devconf.accept_redirects = !on;
+ ipv4_devconf_dflt.forwarding = on;
+
+ read_lock(&dev_base_lock);
+ for (dev = dev_base; dev; dev = dev->next) {
+ struct in_device *in_dev;
+ rcu_read_lock();
+ in_dev = __in_dev_get(dev);
+ if (in_dev)
+ in_dev->cnf.forwarding = on;
+ rcu_read_unlock();
+ }
+ read_unlock(&dev_base_lock);
+
+ rt_cache_flush(0);
+}
+
+static int devinet_sysctl_forward(ctl_table *ctl, int write,
+ struct file* filp, void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
+
+ if (write && *valp != val) {
+ if (valp == &ipv4_devconf.forwarding)
+ inet_forward_change();
+ else if (valp != &ipv4_devconf_dflt.forwarding)
+ rt_cache_flush(0);
+ }
+
+ return ret;
+}
+
+int ipv4_doint_and_flush(ctl_table *ctl, int write,
+ struct file* filp, void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int *valp = ctl->data;
+ int val = *valp;
+ int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
+
+ if (write && *valp != val)
+ rt_cache_flush(0);
+
+ return ret;
+}
+
+int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen,
+ void **context)
+{
+ int *valp = table->data;
+ int new;
+
+ if (!newval || !newlen)
+ return 0;
+
+ if (newlen != sizeof(int))
+ return -EINVAL;
+
+ if (get_user(new, (int __user *)newval))
+ return -EFAULT;
+
+ if (new == *valp)
+ return 0;
+
+ if (oldval && oldlenp) {
+ size_t len;
+
+ if (get_user(len, oldlenp))
+ return -EFAULT;
+
+ if (len) {
+ if (len > table->maxlen)
+ len = table->maxlen;
+ if (copy_to_user(oldval, valp, len))
+ return -EFAULT;
+ if (put_user(len, oldlenp))
+ return -EFAULT;
+ }
+ }
+
+ *valp = new;
+ rt_cache_flush(0);
+ return 1;
+}
+
+
+static struct devinet_sysctl_table {
+ struct ctl_table_header *sysctl_header;
+ ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
+ ctl_table devinet_dev[2];
+ ctl_table devinet_conf_dir[2];
+ ctl_table devinet_proto_dir[2];
+ ctl_table devinet_root_dir[2];
+} devinet_sysctl = {
+ .devinet_vars = {
+ {
+ .ctl_name = NET_IPV4_CONF_FORWARDING,
+ .procname = "forwarding",
+ .data = &ipv4_devconf.forwarding,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &devinet_sysctl_forward,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_MC_FORWARDING,
+ .procname = "mc_forwarding",
+ .data = &ipv4_devconf.mc_forwarding,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS,
+ .procname = "accept_redirects",
+ .data = &ipv4_devconf.accept_redirects,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS,
+ .procname = "secure_redirects",
+ .data = &ipv4_devconf.secure_redirects,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_SHARED_MEDIA,
+ .procname = "shared_media",
+ .data = &ipv4_devconf.shared_media,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_RP_FILTER,
+ .procname = "rp_filter",
+ .data = &ipv4_devconf.rp_filter,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS,
+ .procname = "send_redirects",
+ .data = &ipv4_devconf.send_redirects,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE,
+ .procname = "accept_source_route",
+ .data = &ipv4_devconf.accept_source_route,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_PROXY_ARP,
+ .procname = "proxy_arp",
+ .data = &ipv4_devconf.proxy_arp,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_MEDIUM_ID,
+ .procname = "medium_id",
+ .data = &ipv4_devconf.medium_id,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_BOOTP_RELAY,
+ .procname = "bootp_relay",
+ .data = &ipv4_devconf.bootp_relay,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_LOG_MARTIANS,
+ .procname = "log_martians",
+ .data = &ipv4_devconf.log_martians,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_TAG,
+ .procname = "tag",
+ .data = &ipv4_devconf.tag,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_ARPFILTER,
+ .procname = "arp_filter",
+ .data = &ipv4_devconf.arp_filter,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE,
+ .procname = "arp_announce",
+ .data = &ipv4_devconf.arp_announce,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_ARP_IGNORE,
+ .procname = "arp_ignore",
+ .data = &ipv4_devconf.arp_ignore,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_NOXFRM,
+ .procname = "disable_xfrm",
+ .data = &ipv4_devconf.no_xfrm,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &ipv4_doint_and_flush,
+ .strategy = &ipv4_doint_and_flush_strategy,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_NOPOLICY,
+ .procname = "disable_policy",
+ .data = &ipv4_devconf.no_policy,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &ipv4_doint_and_flush,
+ .strategy = &ipv4_doint_and_flush_strategy,
+ },
+ {
+ .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION,
+ .procname = "force_igmp_version",
+ .data = &ipv4_devconf.force_igmp_version,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &ipv4_doint_and_flush,
+ .strategy = &ipv4_doint_and_flush_strategy,
+ },
+ },
+ .devinet_dev = {
+ {
+ .ctl_name = NET_PROTO_CONF_ALL,
+ .procname = "all",
+ .mode = 0555,
+ .child = devinet_sysctl.devinet_vars,
+ },
+ },
+ .devinet_conf_dir = {
+ {
+ .ctl_name = NET_IPV4_CONF,
+ .procname = "conf",
+ .mode = 0555,
+ .child = devinet_sysctl.devinet_dev,
+ },
+ },
+ .devinet_proto_dir = {
+ {
+ .ctl_name = NET_IPV4,
+ .procname = "ipv4",
+ .mode = 0555,
+ .child = devinet_sysctl.devinet_conf_dir,
+ },
+ },
+ .devinet_root_dir = {
+ {
+ .ctl_name = CTL_NET,
+ .procname = "net",
+ .mode = 0555,
+ .child = devinet_sysctl.devinet_proto_dir,
+ },
+ },
+};
+
+static void devinet_sysctl_register(struct in_device *in_dev,
+ struct ipv4_devconf *p)
+{
+ int i;
+ struct net_device *dev = in_dev ? in_dev->dev : NULL;
+ struct devinet_sysctl_table *t = kmalloc(sizeof(*t), GFP_KERNEL);
+ char *dev_name = NULL;
+
+ if (!t)
+ return;
+ memcpy(t, &devinet_sysctl, sizeof(*t));
+ for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
+ t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
+ t->devinet_vars[i].de = NULL;
+ }
+
+ if (dev) {
+ dev_name = dev->name;
+ t->devinet_dev[0].ctl_name = dev->ifindex;
+ } else {
+ dev_name = "default";
+ t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
+ }
+
+ /*
+ * Make a copy of dev_name, because '.procname' is regarded as const
+ * by sysctl and we wouldn't want anyone to change it under our feet
+ * (see SIOCSIFNAME).
+ */
+ dev_name = net_sysctl_strdup(dev_name);
+ if (!dev_name)
+ goto free;
+
+ t->devinet_dev[0].procname = dev_name;
+ t->devinet_dev[0].child = t->devinet_vars;
+ t->devinet_dev[0].de = NULL;
+ t->devinet_conf_dir[0].child = t->devinet_dev;
+ t->devinet_conf_dir[0].de = NULL;
+ t->devinet_proto_dir[0].child = t->devinet_conf_dir;
+ t->devinet_proto_dir[0].de = NULL;
+ t->devinet_root_dir[0].child = t->devinet_proto_dir;
+ t->devinet_root_dir[0].de = NULL;
+
+ t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0);
+ if (!t->sysctl_header)
+ goto free_procname;
+
+ p->sysctl = t;
+ return;
+
+ /* error path */
+ free_procname:
+ kfree(dev_name);
+ free:
+ kfree(t);
+ return;
+}
+
+static void devinet_sysctl_unregister(struct ipv4_devconf *p)
+{
+ if (p->sysctl) {
+ struct devinet_sysctl_table *t = p->sysctl;
+ p->sysctl = NULL;
+ unregister_sysctl_table(t->sysctl_header);
+ kfree(t->devinet_dev[0].procname);
+ kfree(t);
+ }
+}
+#endif
+
+void __init devinet_init(void)
+{
+ register_gifconf(PF_INET, inet_gifconf);
+ register_netdevice_notifier(&ip_netdev_notifier);
+ rtnetlink_links[PF_INET] = inet_rtnetlink_table;
+#ifdef CONFIG_SYSCTL
+ devinet_sysctl.sysctl_header =
+ register_sysctl_table(devinet_sysctl.devinet_root_dir, 0);
+ devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
+#endif
+}
+
+EXPORT_SYMBOL(devinet_ioctl);
+EXPORT_SYMBOL(in_dev_finish_destroy);
+EXPORT_SYMBOL(inet_select_addr);
+EXPORT_SYMBOL(inetdev_by_index);
+EXPORT_SYMBOL(register_inetaddr_notifier);
+EXPORT_SYMBOL(unregister_inetaddr_notifier);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 05:46:02 +0000