devinet.c
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上传日期:2013-04-10
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文件大小:28k
- /*
- * 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 <asm/bitops.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 = { 1, 1, 1, 1, 0, };
- static struct ipv4_devconf ipv4_devconf_dflt = { 1, 1, 1, 1, 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
- int inet_ifa_count;
- int inet_dev_count;
- /* Locks all the inet devices. */
- rwlock_t inetdev_lock = RW_LOCK_UNLOCKED;
- static struct in_ifaddr * inet_alloc_ifa(void)
- {
- struct in_ifaddr *ifa;
- ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
- if (ifa) {
- memset(ifa, 0, sizeof(*ifa));
- inet_ifa_count++;
- }
- return ifa;
- }
- static __inline__ void inet_free_ifa(struct in_ifaddr *ifa)
- {
- if (ifa->ifa_dev)
- __in_dev_put(ifa->ifa_dev);
- kfree(ifa);
- inet_ifa_count--;
- }
- void in_dev_finish_destroy(struct in_device *idev)
- {
- struct net_device *dev = idev->dev;
- BUG_TRAP(idev->ifa_list==NULL);
- BUG_TRAP(idev->mc_list==NULL);
- #ifdef NET_REFCNT_DEBUG
- printk(KERN_DEBUG "in_dev_finish_destroy: %p=%sn", idev, dev ? dev->name : "NIL");
- #endif
- dev_put(dev);
- if (!idev->dead) {
- printk("Freeing alive in_device %pn", idev);
- return;
- }
- inet_dev_count--;
- 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)
- return NULL;
- memset(in_dev, 0, sizeof(*in_dev));
- in_dev->lock = RW_LOCK_UNLOCKED;
- 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) {
- kfree(in_dev);
- return NULL;
- }
- inet_dev_count++;
- /* Reference in_dev->dev */
- dev_hold(dev);
- #ifdef CONFIG_SYSCTL
- neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, NET_IPV4_NEIGH, "ipv4");
- #endif
- write_lock_bh(&inetdev_lock);
- dev->ip_ptr = in_dev;
- /* Account for reference dev->ip_ptr */
- in_dev_hold(in_dev);
- write_unlock_bh(&inetdev_lock);
- #ifdef CONFIG_SYSCTL
- devinet_sysctl_register(in_dev, &in_dev->cnf);
- #endif
- if (dev->flags&IFF_UP)
- ip_mc_up(in_dev);
- return in_dev;
- }
- static void inetdev_destroy(struct in_device *in_dev)
- {
- struct in_ifaddr *ifa;
- ASSERT_RTNL();
- 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
- write_lock_bh(&inetdev_lock);
- in_dev->dev->ip_ptr = NULL;
- /* in_dev_put following below will kill the in_device */
- write_unlock_bh(&inetdev_lock);
- neigh_parms_release(&arp_tbl, in_dev->arp_parms);
- in_dev_put(in_dev);
- }
- int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b)
- {
- read_lock(&in_dev->lock);
- for_primary_ifa(in_dev) {
- if (inet_ifa_match(a, ifa)) {
- if (!b || inet_ifa_match(b, ifa)) {
- read_unlock(&in_dev->lock);
- return 1;
- }
- }
- } endfor_ifa(in_dev);
- read_unlock(&in_dev->lock);
- 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;
- }
- write_lock_bh(&in_dev->lock);
- *ifap1 = ifa->ifa_next;
- write_unlock_bh(&in_dev->lock);
- rtmsg_ifa(RTM_DELADDR, ifa);
- notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa);
- inet_free_ifa(ifa);
- }
- }
- /* 2. Unlink it */
- write_lock_bh(&in_dev->lock);
- *ifap = ifa1->ifa_next;
- write_unlock_bh(&in_dev->lock);
- /* 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 == NULL)
- 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 == 0) {
- 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;
- write_lock_bh(&in_dev->lock);
- *ifap = ifa;
- write_unlock_bh(&in_dev->lock);
- /* 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 == NULL) {
- in_dev = inetdev_init(dev);
- if (in_dev == NULL) {
- inet_free_ifa(ifa);
- return -ENOBUFS;
- }
- }
- if (ifa->ifa_dev != in_dev) {
- BUG_TRAP(ifa->ifa_dev==NULL);
- 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;
- }
- 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)
- return -EADDRNOTAVAIL;
- __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] && strcmp(RTA_DATA(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;
- }
- return -EADDRNOTAVAIL;
- }
- 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;
- ASSERT_RTNL();
- if (ifm->ifa_prefixlen > 32 || rta[IFA_LOCAL-1] == NULL)
- return -EINVAL;
- if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
- return -ENODEV;
- if ((in_dev = __in_dev_get(dev)) == NULL) {
- in_dev = inetdev_init(dev);
- if (!in_dev)
- return -ENOBUFS;
- }
- if ((ifa = inet_alloc_ifa()) == NULL)
- return -ENOBUFS;
- if (rta[IFA_ADDRESS-1] == NULL)
- 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])
- memcpy(ifa->ifa_label, RTA_DATA(rta[IFA_LABEL-1]), IFNAMSIZ);
- else
- memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
- return inet_insert_ifa(ifa);
- }
- /*
- * Determine a default network mask, based on the IP address.
- */
- static __inline__ int inet_abc_len(u32 addr)
- {
- if (ZERONET(addr))
- return 0;
- addr = ntohl(addr);
- if (IN_CLASSA(addr))
- return 8;
- if (IN_CLASSB(addr))
- return 16;
- if (IN_CLASSC(addr))
- return 24;
- /*
- * Something else, probably a multicast.
- */
-
- return -1;
- }
- int devinet_ioctl(unsigned int cmd, void *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 = 0;
- int tryaddrmatch = 0;
- /*
- * Fetch the caller's info block into kernel space
- */
- if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
- return -EFAULT;
- 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:
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- 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 */
- if (!capable(CAP_NET_ADMIN))
- return -EACCES;
- if (sin->sin_family != AF_INET)
- return -EINVAL;
- break;
- default:
- return -EINVAL;
- }
- dev_probe_lock();
- rtnl_lock();
- if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) {
- ret = -ENODEV;
- 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) == 0)
- && (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 == NULL) {
- for (ifap=&in_dev->ifa_list; (ifa=*ifap) != NULL; ifap=&ifa->ifa_next)
- if (strcmp(ifr.ifr_name, ifa->ifa_label) == 0)
- break;
- }
- }
- if (ifa == NULL && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) {
- ret = -EADDRNOTAVAIL;
- 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) {
- if (ifa == NULL) {
- ret = -EADDRNOTAVAIL;
- break;
- }
- 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) */
- if (inet_abc_len(sin->sin_addr.s_addr) < 0) {
- ret = -EINVAL;
- break;
- }
- if (!ifa) {
- if ((ifa = inet_alloc_ifa()) == NULL) {
- ret = -ENOBUFS;
- 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 */
- 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 */
- if (ifa->ifa_address != sin->sin_addr.s_addr) {
- if (inet_abc_len(sin->sin_addr.s_addr) < 0) {
- ret = -EINVAL;
- break;
- }
- 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.
- */
- if (bad_mask(sin->sin_addr.s_addr, 0)) {
- ret = -EINVAL;
- break;
- }
- 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);
- inet_insert_ifa(ifa);
- }
- break;
- }
- done:
- rtnl_unlock();
- dev_probe_unlock();
- return ret;
- rarok:
- rtnl_unlock();
- dev_probe_unlock();
- if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
- return -EFAULT;
- return 0;
- }
- static int
- inet_gifconf(struct net_device *dev, char *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==NULL || (ifa=in_dev->ifa_list)==NULL)
- return 0;
- for ( ; ifa; ifa = ifa->ifa_next) {
- if (!buf) {
- done += sizeof(ifr);
- continue;
- }
- if (len < (int) sizeof(ifr))
- return done;
- 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)))
- return -EFAULT;
- buf += sizeof(struct ifreq);
- len -= sizeof(struct ifreq);
- done += sizeof(struct ifreq);
- }
- return done;
- }
- u32 inet_select_addr(const struct net_device *dev, u32 dst, int scope)
- {
- u32 addr = 0;
- struct in_device *in_dev;
- read_lock(&inetdev_lock);
- in_dev = __in_dev_get(dev);
- if (in_dev == NULL) {
- read_unlock(&inetdev_lock);
- return 0;
- }
- read_lock(&in_dev->lock);
- 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);
- read_unlock(&in_dev->lock);
- read_unlock(&inetdev_lock);
- if (addr)
- return addr;
- /* 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);
- read_lock(&inetdev_lock);
- for (dev=dev_base; dev; dev=dev->next) {
- if ((in_dev=__in_dev_get(dev)) == NULL)
- continue;
- read_lock(&in_dev->lock);
- for_primary_ifa(in_dev) {
- if (ifa->ifa_scope != RT_SCOPE_LINK &&
- ifa->ifa_scope <= scope) {
- read_unlock(&in_dev->lock);
- read_unlock(&inetdev_lock);
- read_unlock(&dev_base_lock);
- return ifa->ifa_local;
- }
- } endfor_ifa(in_dev);
- read_unlock(&in_dev->lock);
- }
- read_unlock(&inetdev_lock);
- read_unlock(&dev_base_lock);
- return 0;
- }
- /*
- * 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);
- }
- /* 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 == NULL)
- return NOTIFY_DONE;
- switch (event) {
- case NETDEV_REGISTER:
- printk(KERN_DEBUG "inetdev_event: bugn");
- 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:
- if (in_dev->ifa_list) {
- struct in_ifaddr *ifa;
- for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
- memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
- /* Do not notify about label change, this event is
- not interesting to applications using netlink.
- */
- }
- break;
- }
- return NOTIFY_DONE;
- }
- 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));
- 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;
- int s_idx, s_ip_idx;
- struct net_device *dev;
- struct in_device *in_dev;
- struct in_ifaddr *ifa;
- 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;
- read_lock(&inetdev_lock);
- if ((in_dev = __in_dev_get(dev)) == NULL) {
- read_unlock(&inetdev_lock);
- continue;
- }
- read_lock(&in_dev->lock);
- 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) {
- read_unlock(&in_dev->lock);
- read_unlock(&inetdev_lock);
- goto done;
- }
- }
- read_unlock(&in_dev->lock);
- read_unlock(&inetdev_lock);
- }
- 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)
- {
- struct sk_buff *skb;
- int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
- skb = alloc_skb(size, GFP_KERNEL);
- if (!skb) {
- netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, ENOBUFS);
- return;
- }
- if (inet_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
- kfree_skb(skb);
- netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, EINVAL);
- return;
- }
- 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] =
- {
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- { inet_rtm_newaddr, NULL, },
- { inet_rtm_deladdr, NULL, },
- { NULL, inet_dump_ifaddr, },
- { NULL, NULL, },
- { inet_rtm_newroute, NULL, },
- { inet_rtm_delroute, NULL, },
- { inet_rtm_getroute, inet_dump_fib, },
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- #ifdef CONFIG_IP_MULTIPLE_TABLES
- { inet_rtm_newrule, NULL, },
- { inet_rtm_delrule, NULL, },
- { NULL, inet_dump_rules, },
- { NULL, NULL, },
- #else
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- #endif
- };
- #ifdef CONFIG_SYSCTL
- void inet_forward_change()
- {
- 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;
- read_lock(&inetdev_lock);
- in_dev = __in_dev_get(dev);
- if (in_dev)
- in_dev->cnf.forwarding = on;
- read_unlock(&inetdev_lock);
- }
- read_unlock(&dev_base_lock);
- rt_cache_flush(0);
- }
- static
- int devinet_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
- void *buffer, size_t *lenp)
- {
- int *valp = ctl->data;
- int val = *valp;
- int ret;
- ret = proc_dointvec(ctl, write, filp, buffer, lenp);
- 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;
- }
- static struct devinet_sysctl_table
- {
- struct ctl_table_header *sysctl_header;
- ctl_table devinet_vars[15];
- 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 = {
- NULL,
- {{NET_IPV4_CONF_FORWARDING, "forwarding",
- &ipv4_devconf.forwarding, sizeof(int), 0644, NULL,
- &devinet_sysctl_forward},
- {NET_IPV4_CONF_MC_FORWARDING, "mc_forwarding",
- &ipv4_devconf.mc_forwarding, sizeof(int), 0444, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_ACCEPT_REDIRECTS, "accept_redirects",
- &ipv4_devconf.accept_redirects, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_SECURE_REDIRECTS, "secure_redirects",
- &ipv4_devconf.secure_redirects, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_SHARED_MEDIA, "shared_media",
- &ipv4_devconf.shared_media, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_RP_FILTER, "rp_filter",
- &ipv4_devconf.rp_filter, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_SEND_REDIRECTS, "send_redirects",
- &ipv4_devconf.send_redirects, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, "accept_source_route",
- &ipv4_devconf.accept_source_route, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_PROXY_ARP, "proxy_arp",
- &ipv4_devconf.proxy_arp, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_MEDIUM_ID, "medium_id",
- &ipv4_devconf.medium_id, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_BOOTP_RELAY, "bootp_relay",
- &ipv4_devconf.bootp_relay, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_LOG_MARTIANS, "log_martians",
- &ipv4_devconf.log_martians, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_TAG, "tag",
- &ipv4_devconf.tag, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV4_CONF_ARPFILTER, "arp_filter",
- &ipv4_devconf.arp_filter, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {0}},
- {{NET_PROTO_CONF_ALL, "all", NULL, 0, 0555, devinet_sysctl.devinet_vars},{0}},
- {{NET_IPV4_CONF, "conf", NULL, 0, 0555, devinet_sysctl.devinet_dev},{0}},
- {{NET_IPV4, "ipv4", NULL, 0, 0555, devinet_sysctl.devinet_conf_dir},{0}},
- {{CTL_NET, "net", NULL, 0, 0555, devinet_sysctl.devinet_proto_dir},{0}}
- };
- 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;
- t = kmalloc(sizeof(*t), GFP_KERNEL);
- if (t == NULL)
- return;
- memcpy(t, &devinet_sysctl, sizeof(*t));
- for (i=0; i<sizeof(t->devinet_vars)/sizeof(t->devinet_vars[0])-1; i++) {
- t->devinet_vars[i].data += (char*)p - (char*)&ipv4_devconf;
- t->devinet_vars[i].de = NULL;
- }
- if (dev) {
- t->devinet_dev[0].procname = dev->name;
- t->devinet_dev[0].ctl_name = dev->ifindex;
- } else {
- t->devinet_dev[0].procname = "default";
- t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
- }
- 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 == NULL)
- kfree(t);
- else
- p->sysctl = t;
- }
- 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);
- }
- }
- #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
- }