/* * NET3 IP device support routines. * * Version: $Id: devinet.c,v 1.39 2000/12/10 22:24:11 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 */ #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 #ifdef CONFIG_KMOD #include <linux/kmod.h> #endif #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, }; #ifdef CONFIG_RTNETLINK static void rtmsg_ifa(int event, struct in_ifaddr *); #else #define rtmsg_ifa(a,b) do { } while(0) #endif 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; 85 static struct in_ifaddr * inet_alloc_ifa(void) { struct in_ifaddr *ifa; ifa = kmalloc(sizeof(*ifa), GFP_KERNEL); 90 if (ifa) { memset(ifa, 0, sizeof(*ifa)); inet_ifa_count++; } 95 return ifa; } 98 static __inline__ void inet_free_ifa(struct in_ifaddr *ifa) { 100 if (ifa->ifa_dev) __in_dev_put(ifa->ifa_dev); kfree(ifa); inet_ifa_count--; } 106 void in_dev_finish_destroy(struct in_device *idev) { struct net_device *dev = idev->dev; 110 BUG_TRAP(idev->ifa_list==NULL); 111 BUG_TRAP(idev->mc_list==NULL); #ifdef NET_REFCNT_DEBUG printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", idev, dev ? dev->name : "NIL"); #endif dev_put(dev); 116 if (!idev->dead) { printk("Freeing alive in_device %p\n", idev); 118 return; } inet_dev_count--; kfree(idev); } 124 struct in_device *inetdev_init(struct net_device *dev) { struct in_device *in_dev; 128 ASSERT_RTNL(); in_dev = kmalloc(sizeof(*in_dev), GFP_KERNEL); 131 if (!in_dev) 132 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; 138 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) { kfree(in_dev); 140 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 148 write_lock_bh(&inetdev_lock); dev->ip_ptr = in_dev; /* Account for reference dev->ip_ptr */ in_dev_hold(in_dev); 152 write_unlock_bh(&inetdev_lock); #ifdef CONFIG_SYSCTL devinet_sysctl_register(in_dev, &in_dev->cnf); #endif 156 if (dev->flags&IFF_UP) ip_mc_up(in_dev); 158 return in_dev; } 161 static void inetdev_destroy(struct in_device *in_dev) { struct in_ifaddr *ifa; 165 ASSERT_RTNL(); in_dev->dead = 1; ip_mc_destroy_dev(in_dev); 171 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 179 write_lock_bh(&inetdev_lock); in_dev->dev->ip_ptr = NULL; /* in_dev_put following below will kill the in_device */ 182 write_unlock_bh(&inetdev_lock); neigh_parms_release(&arp_tbl, in_dev->arp_parms); in_dev_put(in_dev); } 189 int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b) { read_lock(&in_dev->lock); 192 for_primary_ifa(in_dev) { 193 if (inet_ifa_match(a, ifa)) { 194 if (!b || inet_ifa_match(b, ifa)) { 195 read_unlock(&in_dev->lock); 196 return 1; } } } endfor_ifa(in_dev); 200 read_unlock(&in_dev->lock); 201 return 0; } static void 205 inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, int destroy) { struct in_ifaddr *ifa1 = *ifap; 209 ASSERT_RTNL(); /* 1. Deleting primary ifaddr forces deletion all secondaries */ 213 if (!(ifa1->ifa_flags&IFA_F_SECONDARY)) { struct in_ifaddr *ifa; struct in_ifaddr **ifap1 = &ifa1->ifa_next; 217 while ((ifa=*ifap1) != NULL) { if (!(ifa->ifa_flags&IFA_F_SECONDARY) || ifa1->ifa_mask != ifa->ifa_mask || 220 !inet_ifa_match(ifa1->ifa_address, ifa)) { ifap1 = &ifa->ifa_next; 222 continue; } 224 write_lock_bh(&in_dev->lock); *ifap1 = ifa->ifa_next; 226 write_unlock_bh(&in_dev->lock); 228 rtmsg_ifa(RTM_DELADDR, ifa); notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa); inet_free_ifa(ifa); } } /* 2. Unlink it */ 236 write_lock_bh(&in_dev->lock); *ifap = ifa1->ifa_next; 238 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. */ 250 rtmsg_ifa(RTM_DELADDR, ifa1); notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 252 if (destroy) { inet_free_ifa(ifa1); 255 if (in_dev->ifa_list == NULL) inetdev_destroy(in_dev); } } static int 261 inet_insert_ifa(struct in_ifaddr *ifa) { struct in_device *in_dev = ifa->ifa_dev; struct in_ifaddr *ifa1, **ifap, **last_primary; 266 ASSERT_RTNL(); 268 if (ifa->ifa_local == 0) { inet_free_ifa(ifa); 270 return 0; } ifa->ifa_flags &= ~IFA_F_SECONDARY; last_primary = &in_dev->ifa_list; 276 for (ifap=&in_dev->ifa_list; (ifa1=*ifap)!=NULL; ifap=&ifa1->ifa_next) { 277 if (!(ifa1->ifa_flags&IFA_F_SECONDARY) && ifa->ifa_scope <= ifa1->ifa_scope) last_primary = &ifa1->ifa_next; 279 if (ifa1->ifa_mask == ifa->ifa_mask && inet_ifa_match(ifa1->ifa_address, ifa)) { 280 if (ifa1->ifa_local == ifa->ifa_local) { inet_free_ifa(ifa); 282 return -EEXIST; } 284 if (ifa1->ifa_scope != ifa->ifa_scope) { inet_free_ifa(ifa); 286 return -EINVAL; } ifa->ifa_flags |= IFA_F_SECONDARY; } } 292 if (!(ifa->ifa_flags&IFA_F_SECONDARY)) { net_srandom(ifa->ifa_local); ifap = last_primary; } ifa->ifa_next = *ifap; 298 write_lock_bh(&in_dev->lock); *ifap = ifa; 300 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 */ 305 rtmsg_ifa(RTM_NEWADDR, ifa); notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 308 return 0; } static int 312 inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) { struct in_device *in_dev = __in_dev_get(dev); 316 ASSERT_RTNL(); 318 if (in_dev == NULL) { in_dev = inetdev_init(dev); 320 if (in_dev == NULL) { inet_free_ifa(ifa); 322 return -ENOBUFS; } } 325 if (ifa->ifa_dev != in_dev) { 326 BUG_TRAP(ifa->ifa_dev==NULL); in_dev_hold(in_dev); ifa->ifa_dev=in_dev; } 330 if (LOOPBACK(ifa->ifa_local)) ifa->ifa_scope = RT_SCOPE_HOST; 332 return inet_insert_ifa(ifa); } 335 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); 341 if (dev) in_dev = in_dev_get(dev); 343 read_unlock(&dev_base_lock); 344 return in_dev; } /* Called only from RTNL semaphored context. No locks. */ 349 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask) { 351 ASSERT_RTNL(); 353 for_primary_ifa(in_dev) { 354 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 355 return ifa; } endfor_ifa(in_dev); 357 return NULL; } #ifdef CONFIG_RTNETLINK 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); } #endif /* * Determine a default network mask, based on the IP address. */ 444 static __inline__ int inet_abc_len(u32 addr) { 446 if (ZERONET(addr)) 447 return 0; addr = ntohl(addr); 450 if (IN_CLASSA(addr)) 451 return 8; 452 if (IN_CLASSB(addr)) 453 return 16; 454 if (IN_CLASSC(addr)) 455 return 24; /* * Something else, probably a multicast. */ 461 return -1; } 465 int devinet_ioctl(unsigned int cmd, void *arg) { struct ifreq ifr; 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; /* * Fetch the caller's info block into kernel space */ 480 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 481 return -EFAULT; ifr.ifr_name[IFNAMSIZ-1] = 0; colon = strchr(ifr.ifr_name, ':'); 485 if (colon) *colon = 0; #ifdef CONFIG_KMOD dev_load(ifr.ifr_name); #endif 492 switch(cmd) { 493 case SIOCGIFADDR: /* Get interface address */ 494 case SIOCGIFBRDADDR: /* Get the broadcast address */ 495 case SIOCGIFDSTADDR: /* Get the destination address */ 496 case SIOCGIFNETMASK: /* Get the netmask for the interface */ /* Note that this 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) */ memset(sin, 0, sizeof(*sin)); sin->sin_family = AF_INET; 503 break; 505 case SIOCSIFFLAGS: 506 if (!capable(CAP_NET_ADMIN)) 507 return -EACCES; 508 break; 509 case SIOCSIFADDR: /* Set interface address (and family) */ 510 case SIOCSIFBRDADDR: /* Set the broadcast address */ 511 case SIOCSIFDSTADDR: /* Set the destination address */ 512 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 513 if (!capable(CAP_NET_ADMIN)) 514 return -EACCES; 515 if (sin->sin_family != AF_INET) 516 return -EINVAL; 517 break; 518 default: 519 return -EINVAL; } dev_probe_lock(); rtnl_lock(); 525 if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) { ret = -ENODEV; 527 goto done; } 530 if (colon) *colon = ':'; 533 if ((in_dev=__in_dev_get(dev)) != NULL) { 534 for (ifap=&in_dev->ifa_list; (ifa=*ifap) != NULL; ifap=&ifa->ifa_next) 535 if (strcmp(ifr.ifr_name, ifa->ifa_label) == 0) 536 break; } 539 if (ifa == NULL && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) { ret = -EADDRNOTAVAIL; 541 goto done; } 544 switch(cmd) { 545 case SIOCGIFADDR: /* Get interface address */ sin->sin_addr.s_addr = ifa->ifa_local; 547 goto rarok; 549 case SIOCGIFBRDADDR: /* Get the broadcast address */ sin->sin_addr.s_addr = ifa->ifa_broadcast; 551 goto rarok; 553 case SIOCGIFDSTADDR: /* Get the destination address */ sin->sin_addr.s_addr = ifa->ifa_address; 555 goto rarok; 557 case SIOCGIFNETMASK: /* Get the netmask for the interface */ sin->sin_addr.s_addr = ifa->ifa_mask; 559 goto rarok; 561 case SIOCSIFFLAGS: 562 if (colon) { 563 if (ifa == NULL) { ret = -EADDRNOTAVAIL; 565 break; } 567 if (!(ifr.ifr_flags&IFF_UP)) inet_del_ifa(in_dev, ifap, 1); 569 break; } ret = dev_change_flags(dev, ifr.ifr_flags); 572 break; 574 case SIOCSIFADDR: /* Set interface address (and family) */ 575 if (inet_abc_len(sin->sin_addr.s_addr) < 0) { ret = -EINVAL; 577 break; } 580 if (!ifa) { 581 if ((ifa = inet_alloc_ifa()) == NULL) { ret = -ENOBUFS; 583 break; } 585 if (colon) memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 587 else memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 589 } else { ret = 0; 591 if (ifa->ifa_local == sin->sin_addr.s_addr) 592 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; 601 if (!(dev->flags&IFF_POINTOPOINT)) { ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 604 if ((dev->flags&IFF_BROADCAST) && ifa->ifa_prefixlen < 31) ifa->ifa_broadcast = ifa->ifa_address|~ifa->ifa_mask; 606 } else { ifa->ifa_prefixlen = 32; ifa->ifa_mask = inet_make_mask(32); } ret = inet_set_ifa(dev, ifa); 611 break; 613 case SIOCSIFBRDADDR: /* Set the broadcast address */ 614 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); } 619 break; 621 case SIOCSIFDSTADDR: /* Set the destination address */ 622 if (ifa->ifa_address != sin->sin_addr.s_addr) { 623 if (inet_abc_len(sin->sin_addr.s_addr) < 0) { ret = -EINVAL; 625 break; } inet_del_ifa(in_dev, ifap, 0); ifa->ifa_address = sin->sin_addr.s_addr; inet_insert_ifa(ifa); } 631 break; 633 case SIOCSIFNETMASK: /* Set the netmask for the interface */ /* * The mask we set must be legal. */ 638 if (bad_mask(sin->sin_addr.s_addr, 0)) { ret = -EINVAL; 640 break; } 643 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); } 649 break; } done: rtnl_unlock(); dev_probe_unlock(); 654 return ret; rarok: rtnl_unlock(); dev_probe_unlock(); 659 if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) 660 return -EFAULT; 661 return 0; } static int 665 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; 672 if (in_dev==NULL || (ifa=in_dev->ifa_list)==NULL) 673 return 0; 675 for ( ; ifa; ifa = ifa->ifa_next) { 676 if (!buf) { done += sizeof(ifr); 678 continue; } 680 if (len < (int) sizeof(ifr)) 681 return done; memset(&ifr, 0, sizeof(struct ifreq)); 683 if (ifa->ifa_label) strcpy(ifr.ifr_name, ifa->ifa_label); 685 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; 691 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) 692 return -EFAULT; buf += sizeof(struct ifreq); len -= sizeof(struct ifreq); done += sizeof(struct ifreq); } 697 return done; } 700 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); 707 if (in_dev == NULL) { 708 read_unlock(&inetdev_lock); 709 return 0; } read_lock(&in_dev->lock); 713 for_primary_ifa(in_dev) { 714 if (ifa->ifa_scope > scope) 715 continue; 716 if (!dst || inet_ifa_match(dst, ifa)) { addr = ifa->ifa_local; 718 break; } 720 if (!addr) addr = ifa->ifa_local; } endfor_ifa(in_dev); 723 read_unlock(&in_dev->lock); 724 read_unlock(&inetdev_lock); 726 if (addr) 727 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); 735 for (dev=dev_base; dev; dev=dev->next) { 736 if ((in_dev=__in_dev_get(dev)) == NULL) 737 continue; read_lock(&in_dev->lock); 740 for_primary_ifa(in_dev) { if (ifa->ifa_scope != RT_SCOPE_LINK && 742 ifa->ifa_scope <= scope) { 743 read_unlock(&in_dev->lock); 744 read_unlock(&inetdev_lock); 745 read_unlock(&dev_base_lock); 746 return ifa->ifa_local; } } endfor_ifa(in_dev); 749 read_unlock(&in_dev->lock); } 751 read_unlock(&inetdev_lock); 752 read_unlock(&dev_base_lock); 754 return 0; } /* * Device notifier */ 761 int register_inetaddr_notifier(struct notifier_block *nb) { 763 return notifier_chain_register(&inetaddr_chain, nb); } 766 int unregister_inetaddr_notifier(struct notifier_block *nb) { 768 return notifier_chain_unregister(&inetaddr_chain,nb); } /* Called only under RTNL semaphore */ 773 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); 778 ASSERT_RTNL(); 780 if (in_dev == NULL) 781 return NOTIFY_DONE; 783 switch (event) { 784 case NETDEV_REGISTER: printk(KERN_DEBUG "inetdev_event: bug\n"); dev->ip_ptr = NULL; 787 break; 788 case NETDEV_UP: 789 if (dev->mtu < 68) 790 break; 791 if (dev == &loopback_dev) { struct in_ifaddr *ifa; 793 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); 806 break; 807 case NETDEV_DOWN: ip_mc_down(in_dev); 809 break; 810 case NETDEV_CHANGEMTU: 811 if (dev->mtu >= 68) 812 break; /* MTU falled under 68, disable IP */ 814 case NETDEV_UNREGISTER: inetdev_destroy(in_dev); 816 break; 817 case NETDEV_CHANGENAME: 818 if (in_dev->ifa_list) { struct in_ifaddr *ifa; 820 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. */ } 826 break; } 829 return NOTIFY_DONE; } struct notifier_block ip_netdev_notifier={ inetdev_event, NULL, 0 }; #ifdef CONFIG_RTNETLINK 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 }; #endif /* CONFIG_RTNETLINK */ #ifdef CONFIG_SYSCTL 978 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); 987 for (dev = dev_base; dev; dev = dev->next) { struct in_device *in_dev; read_lock(&inetdev_lock); in_dev = __in_dev_get(dev); 991 if (in_dev) in_dev->cnf.forwarding = on; 993 read_unlock(&inetdev_lock); } 995 read_unlock(&dev_base_lock); rt_cache_flush(0); } static 1001 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); 1010 if (write && *valp != val) { 1011 if (valp == &ipv4_devconf.forwarding) inet_forward_change(); 1013 else if (valp != &ipv4_devconf_dflt.forwarding) rt_cache_flush(0); } 1017 return ret; } static struct devinet_sysctl_table { struct ctl_table_header *sysctl_header; ctl_table devinet_vars[13]; 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_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}, {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}} }; 1074 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); 1081 if (t == NULL) 1082 return; memcpy(t, &devinet_sysctl, sizeof(*t)); 1084 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; } 1088 if (dev) { t->devinet_dev[0].procname = dev->name; t->devinet_dev[0].ctl_name = dev->ifindex; 1091 } 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); 1105 if (t->sysctl_header == NULL) kfree(t); 1107 else p->sysctl = t; } 1111 static void devinet_sysctl_unregister(struct ipv4_devconf *p) { 1113 if (p->sysctl) { struct devinet_sysctl_table *t = p->sysctl; p->sysctl = NULL; unregister_sysctl_table(t->sysctl_header); kfree(t); } } #endif 1122 void __init devinet_init(void) { register_gifconf(PF_INET, inet_gifconf); register_netdevice_notifier(&ip_netdev_notifier); #ifdef CONFIG_RTNETLINK rtnetlink_links[PF_INET] = inet_rtnetlink_table; #endif #ifdef CONFIG_SYSCTL devinet_sysctl.sysctl_header = register_sysctl_table(devinet_sysctl.devinet_root_dir, 0); devinet_sysctl_register(NULL, &ipv4_devconf_dflt); #endif }