11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * NET3 IP device support routines. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $ 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * Derived from the IP parts of dev.c 1.0.19 1202c30a84SJesper Juhl * Authors: Ross Biro 131da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 141da177e4SLinus Torvalds * Mark Evans, <evansmp@uhura.aston.ac.uk> 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * Additional Authors: 171da177e4SLinus Torvalds * Alan Cox, <gw4pts@gw4pts.ampr.org> 181da177e4SLinus Torvalds * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds * Changes: 211da177e4SLinus Torvalds * Alexey Kuznetsov: pa_* fields are replaced with ifaddr 221da177e4SLinus Torvalds * lists. 231da177e4SLinus Torvalds * Cyrus Durgin: updated for kmod 241da177e4SLinus Torvalds * Matthias Andree: in devinet_ioctl, compare label and 251da177e4SLinus Torvalds * address (4.4BSD alias style support), 261da177e4SLinus Torvalds * fall back to comparing just the label 271da177e4SLinus Torvalds * if no match found. 281da177e4SLinus Torvalds */ 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/uaccess.h> 321da177e4SLinus Torvalds #include <asm/system.h> 331da177e4SLinus Torvalds #include <linux/bitops.h> 344fc268d2SRandy Dunlap #include <linux/capability.h> 351da177e4SLinus Torvalds #include <linux/module.h> 361da177e4SLinus Torvalds #include <linux/types.h> 371da177e4SLinus Torvalds #include <linux/kernel.h> 381da177e4SLinus Torvalds #include <linux/sched.h> 391da177e4SLinus Torvalds #include <linux/string.h> 401da177e4SLinus Torvalds #include <linux/mm.h> 411da177e4SLinus Torvalds #include <linux/socket.h> 421da177e4SLinus Torvalds #include <linux/sockios.h> 431da177e4SLinus Torvalds #include <linux/in.h> 441da177e4SLinus Torvalds #include <linux/errno.h> 451da177e4SLinus Torvalds #include <linux/interrupt.h> 461823730fSThomas Graf #include <linux/if_addr.h> 471da177e4SLinus Torvalds #include <linux/if_ether.h> 481da177e4SLinus Torvalds #include <linux/inet.h> 491da177e4SLinus Torvalds #include <linux/netdevice.h> 501da177e4SLinus Torvalds #include <linux/etherdevice.h> 511da177e4SLinus Torvalds #include <linux/skbuff.h> 521da177e4SLinus Torvalds #include <linux/rtnetlink.h> 531da177e4SLinus Torvalds #include <linux/init.h> 541da177e4SLinus Torvalds #include <linux/notifier.h> 551da177e4SLinus Torvalds #include <linux/inetdevice.h> 561da177e4SLinus Torvalds #include <linux/igmp.h> 571da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 581da177e4SLinus Torvalds #include <linux/sysctl.h> 591da177e4SLinus Torvalds #endif 601da177e4SLinus Torvalds #include <linux/kmod.h> 611da177e4SLinus Torvalds 6214c85021SArnaldo Carvalho de Melo #include <net/arp.h> 631da177e4SLinus Torvalds #include <net/ip.h> 641da177e4SLinus Torvalds #include <net/route.h> 651da177e4SLinus Torvalds #include <net/ip_fib.h> 665c753978SThomas Graf #include <net/netlink.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds struct ipv4_devconf ipv4_devconf = { 691da177e4SLinus Torvalds .accept_redirects = 1, 701da177e4SLinus Torvalds .send_redirects = 1, 711da177e4SLinus Torvalds .secure_redirects = 1, 721da177e4SLinus Torvalds .shared_media = 1, 731da177e4SLinus Torvalds }; 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static struct ipv4_devconf ipv4_devconf_dflt = { 761da177e4SLinus Torvalds .accept_redirects = 1, 771da177e4SLinus Torvalds .send_redirects = 1, 781da177e4SLinus Torvalds .secure_redirects = 1, 791da177e4SLinus Torvalds .shared_media = 1, 801da177e4SLinus Torvalds .accept_source_route = 1, 811da177e4SLinus Torvalds }; 821da177e4SLinus Torvalds 835c753978SThomas Graf static struct nla_policy ifa_ipv4_policy[IFA_MAX+1] __read_mostly = { 845c753978SThomas Graf [IFA_LOCAL] = { .type = NLA_U32 }, 855c753978SThomas Graf [IFA_ADDRESS] = { .type = NLA_U32 }, 865c753978SThomas Graf [IFA_BROADCAST] = { .type = NLA_U32 }, 875c753978SThomas Graf [IFA_ANYCAST] = { .type = NLA_U32 }, 885176f91eSThomas Graf [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, 895c753978SThomas Graf }; 905c753978SThomas Graf 91d6062cbbSThomas Graf static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 921da177e4SLinus Torvalds 93e041c683SAlan Stern static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 941da177e4SLinus Torvalds static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 951da177e4SLinus Torvalds int destroy); 961da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 971da177e4SLinus Torvalds static void devinet_sysctl_register(struct in_device *in_dev, 981da177e4SLinus Torvalds struct ipv4_devconf *p); 991da177e4SLinus Torvalds static void devinet_sysctl_unregister(struct ipv4_devconf *p); 1001da177e4SLinus Torvalds #endif 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* Locks all the inet devices. */ 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds static struct in_ifaddr *inet_alloc_ifa(void) 1051da177e4SLinus Torvalds { 1060da974f4SPanagiotis Issaris struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds if (ifa) { 1091da177e4SLinus Torvalds INIT_RCU_HEAD(&ifa->rcu_head); 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds return ifa; 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds static void inet_rcu_free_ifa(struct rcu_head *head) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 1181da177e4SLinus Torvalds if (ifa->ifa_dev) 1191da177e4SLinus Torvalds in_dev_put(ifa->ifa_dev); 1201da177e4SLinus Torvalds kfree(ifa); 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds static inline void inet_free_ifa(struct in_ifaddr *ifa) 1241da177e4SLinus Torvalds { 1251da177e4SLinus Torvalds call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds void in_dev_finish_destroy(struct in_device *idev) 1291da177e4SLinus Torvalds { 1301da177e4SLinus Torvalds struct net_device *dev = idev->dev; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds BUG_TRAP(!idev->ifa_list); 1331da177e4SLinus Torvalds BUG_TRAP(!idev->mc_list); 1341da177e4SLinus Torvalds #ifdef NET_REFCNT_DEBUG 1351da177e4SLinus Torvalds printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", 1361da177e4SLinus Torvalds idev, dev ? dev->name : "NIL"); 1371da177e4SLinus Torvalds #endif 1381da177e4SLinus Torvalds dev_put(dev); 1391da177e4SLinus Torvalds if (!idev->dead) 1401da177e4SLinus Torvalds printk("Freeing alive in_device %p\n", idev); 1411da177e4SLinus Torvalds else { 1421da177e4SLinus Torvalds kfree(idev); 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds struct in_device *inetdev_init(struct net_device *dev) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds struct in_device *in_dev; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds ASSERT_RTNL(); 1511da177e4SLinus Torvalds 1520da974f4SPanagiotis Issaris in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 1531da177e4SLinus Torvalds if (!in_dev) 1541da177e4SLinus Torvalds goto out; 1551da177e4SLinus Torvalds INIT_RCU_HEAD(&in_dev->rcu_head); 1561da177e4SLinus Torvalds memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); 1571da177e4SLinus Torvalds in_dev->cnf.sysctl = NULL; 1581da177e4SLinus Torvalds in_dev->dev = dev; 1591da177e4SLinus Torvalds if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) 1601da177e4SLinus Torvalds goto out_kfree; 1611da177e4SLinus Torvalds /* Reference in_dev->dev */ 1621da177e4SLinus Torvalds dev_hold(dev); 1631da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1641da177e4SLinus Torvalds neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, 1651da177e4SLinus Torvalds NET_IPV4_NEIGH, "ipv4", NULL, NULL); 1661da177e4SLinus Torvalds #endif 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds /* Account for reference dev->ip_ptr */ 1691da177e4SLinus Torvalds in_dev_hold(in_dev); 1701da177e4SLinus Torvalds rcu_assign_pointer(dev->ip_ptr, in_dev); 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 1731da177e4SLinus Torvalds devinet_sysctl_register(in_dev, &in_dev->cnf); 1741da177e4SLinus Torvalds #endif 1751da177e4SLinus Torvalds ip_mc_init_dev(in_dev); 1761da177e4SLinus Torvalds if (dev->flags & IFF_UP) 1771da177e4SLinus Torvalds ip_mc_up(in_dev); 1781da177e4SLinus Torvalds out: 1791da177e4SLinus Torvalds return in_dev; 1801da177e4SLinus Torvalds out_kfree: 1811da177e4SLinus Torvalds kfree(in_dev); 1821da177e4SLinus Torvalds in_dev = NULL; 1831da177e4SLinus Torvalds goto out; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds static void in_dev_rcu_put(struct rcu_head *head) 1871da177e4SLinus Torvalds { 1881da177e4SLinus Torvalds struct in_device *idev = container_of(head, struct in_device, rcu_head); 1891da177e4SLinus Torvalds in_dev_put(idev); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds static void inetdev_destroy(struct in_device *in_dev) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds struct in_ifaddr *ifa; 1951da177e4SLinus Torvalds struct net_device *dev; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds ASSERT_RTNL(); 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds dev = in_dev->dev; 2001da177e4SLinus Torvalds if (dev == &loopback_dev) 2011da177e4SLinus Torvalds return; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds in_dev->dead = 1; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds ip_mc_destroy_dev(in_dev); 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds while ((ifa = in_dev->ifa_list) != NULL) { 2081da177e4SLinus Torvalds inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 2091da177e4SLinus Torvalds inet_free_ifa(ifa); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 2131da177e4SLinus Torvalds devinet_sysctl_unregister(&in_dev->cnf); 2141da177e4SLinus Torvalds #endif 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds dev->ip_ptr = NULL; 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 2191da177e4SLinus Torvalds neigh_sysctl_unregister(in_dev->arp_parms); 2201da177e4SLinus Torvalds #endif 2211da177e4SLinus Torvalds neigh_parms_release(&arp_tbl, in_dev->arp_parms); 2221da177e4SLinus Torvalds arp_ifdown(dev); 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds 227ff428d72SAl Viro int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 2281da177e4SLinus Torvalds { 2291da177e4SLinus Torvalds rcu_read_lock(); 2301da177e4SLinus Torvalds for_primary_ifa(in_dev) { 2311da177e4SLinus Torvalds if (inet_ifa_match(a, ifa)) { 2321da177e4SLinus Torvalds if (!b || inet_ifa_match(b, ifa)) { 2331da177e4SLinus Torvalds rcu_read_unlock(); 2341da177e4SLinus Torvalds return 1; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds } endfor_ifa(in_dev); 2381da177e4SLinus Torvalds rcu_read_unlock(); 2391da177e4SLinus Torvalds return 0; 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds 242d6062cbbSThomas Graf static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 243d6062cbbSThomas Graf int destroy, struct nlmsghdr *nlh, u32 pid) 2441da177e4SLinus Torvalds { 2458f937c60SHarald Welte struct in_ifaddr *promote = NULL; 2460ff60a45SJamal Hadi Salim struct in_ifaddr *ifa, *ifa1 = *ifap; 2470ff60a45SJamal Hadi Salim struct in_ifaddr *last_prim = in_dev->ifa_list; 2480ff60a45SJamal Hadi Salim struct in_ifaddr *prev_prom = NULL; 2490ff60a45SJamal Hadi Salim int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds ASSERT_RTNL(); 2521da177e4SLinus Torvalds 2538f937c60SHarald Welte /* 1. Deleting primary ifaddr forces deletion all secondaries 2548f937c60SHarald Welte * unless alias promotion is set 2558f937c60SHarald Welte **/ 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 2581da177e4SLinus Torvalds struct in_ifaddr **ifap1 = &ifa1->ifa_next; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds while ((ifa = *ifap1) != NULL) { 2610ff60a45SJamal Hadi Salim if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 2620ff60a45SJamal Hadi Salim ifa1->ifa_scope <= ifa->ifa_scope) 2630ff60a45SJamal Hadi Salim last_prim = ifa; 2640ff60a45SJamal Hadi Salim 2651da177e4SLinus Torvalds if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 2661da177e4SLinus Torvalds ifa1->ifa_mask != ifa->ifa_mask || 2671da177e4SLinus Torvalds !inet_ifa_match(ifa1->ifa_address, ifa)) { 2681da177e4SLinus Torvalds ifap1 = &ifa->ifa_next; 2690ff60a45SJamal Hadi Salim prev_prom = ifa; 2701da177e4SLinus Torvalds continue; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2730ff60a45SJamal Hadi Salim if (!do_promote) { 2741da177e4SLinus Torvalds *ifap1 = ifa->ifa_next; 2751da177e4SLinus Torvalds 276d6062cbbSThomas Graf rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); 277e041c683SAlan Stern blocking_notifier_call_chain(&inetaddr_chain, 278e041c683SAlan Stern NETDEV_DOWN, ifa); 2791da177e4SLinus Torvalds inet_free_ifa(ifa); 2808f937c60SHarald Welte } else { 2818f937c60SHarald Welte promote = ifa; 2828f937c60SHarald Welte break; 2838f937c60SHarald Welte } 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds /* 2. Unlink it */ 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds *ifap = ifa1->ifa_next; 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* 3. Announce address deletion */ 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds /* Send message first, then call notifier. 2941da177e4SLinus Torvalds At first sight, FIB update triggered by notifier 2951da177e4SLinus Torvalds will refer to already deleted ifaddr, that could confuse 2961da177e4SLinus Torvalds netlink listeners. It is not true: look, gated sees 2971da177e4SLinus Torvalds that route deleted and if it still thinks that ifaddr 2981da177e4SLinus Torvalds is valid, it will try to restore deleted routes... Grr. 2991da177e4SLinus Torvalds So that, this order is correct. 3001da177e4SLinus Torvalds */ 301d6062cbbSThomas Graf rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); 302e041c683SAlan Stern blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 3030ff60a45SJamal Hadi Salim 3040ff60a45SJamal Hadi Salim if (promote) { 3050ff60a45SJamal Hadi Salim 3060ff60a45SJamal Hadi Salim if (prev_prom) { 3070ff60a45SJamal Hadi Salim prev_prom->ifa_next = promote->ifa_next; 3080ff60a45SJamal Hadi Salim promote->ifa_next = last_prim->ifa_next; 3090ff60a45SJamal Hadi Salim last_prim->ifa_next = promote; 3100ff60a45SJamal Hadi Salim } 3110ff60a45SJamal Hadi Salim 3120ff60a45SJamal Hadi Salim promote->ifa_flags &= ~IFA_F_SECONDARY; 313d6062cbbSThomas Graf rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); 314e041c683SAlan Stern blocking_notifier_call_chain(&inetaddr_chain, 315e041c683SAlan Stern NETDEV_UP, promote); 3160ff60a45SJamal Hadi Salim for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { 3170ff60a45SJamal Hadi Salim if (ifa1->ifa_mask != ifa->ifa_mask || 3180ff60a45SJamal Hadi Salim !inet_ifa_match(ifa1->ifa_address, ifa)) 3190ff60a45SJamal Hadi Salim continue; 3200ff60a45SJamal Hadi Salim fib_add_ifaddr(ifa); 3210ff60a45SJamal Hadi Salim } 3220ff60a45SJamal Hadi Salim 3230ff60a45SJamal Hadi Salim } 3241da177e4SLinus Torvalds if (destroy) { 3251da177e4SLinus Torvalds inet_free_ifa(ifa1); 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds if (!in_dev->ifa_list) 3281da177e4SLinus Torvalds inetdev_destroy(in_dev); 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 332d6062cbbSThomas Graf static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 333d6062cbbSThomas Graf int destroy) 334d6062cbbSThomas Graf { 335d6062cbbSThomas Graf __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 336d6062cbbSThomas Graf } 337d6062cbbSThomas Graf 338d6062cbbSThomas Graf static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 339d6062cbbSThomas Graf u32 pid) 3401da177e4SLinus Torvalds { 3411da177e4SLinus Torvalds struct in_device *in_dev = ifa->ifa_dev; 3421da177e4SLinus Torvalds struct in_ifaddr *ifa1, **ifap, **last_primary; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds ASSERT_RTNL(); 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds if (!ifa->ifa_local) { 3471da177e4SLinus Torvalds inet_free_ifa(ifa); 3481da177e4SLinus Torvalds return 0; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds ifa->ifa_flags &= ~IFA_F_SECONDARY; 3521da177e4SLinus Torvalds last_primary = &in_dev->ifa_list; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 3551da177e4SLinus Torvalds ifap = &ifa1->ifa_next) { 3561da177e4SLinus Torvalds if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 3571da177e4SLinus Torvalds ifa->ifa_scope <= ifa1->ifa_scope) 3581da177e4SLinus Torvalds last_primary = &ifa1->ifa_next; 3591da177e4SLinus Torvalds if (ifa1->ifa_mask == ifa->ifa_mask && 3601da177e4SLinus Torvalds inet_ifa_match(ifa1->ifa_address, ifa)) { 3611da177e4SLinus Torvalds if (ifa1->ifa_local == ifa->ifa_local) { 3621da177e4SLinus Torvalds inet_free_ifa(ifa); 3631da177e4SLinus Torvalds return -EEXIST; 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds if (ifa1->ifa_scope != ifa->ifa_scope) { 3661da177e4SLinus Torvalds inet_free_ifa(ifa); 3671da177e4SLinus Torvalds return -EINVAL; 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds ifa->ifa_flags |= IFA_F_SECONDARY; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 3741da177e4SLinus Torvalds net_srandom(ifa->ifa_local); 3751da177e4SLinus Torvalds ifap = last_primary; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds ifa->ifa_next = *ifap; 3791da177e4SLinus Torvalds *ifap = ifa; 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds /* Send message first, then call notifier. 3821da177e4SLinus Torvalds Notifier will trigger FIB update, so that 3831da177e4SLinus Torvalds listeners of netlink will know about new ifaddr */ 384d6062cbbSThomas Graf rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); 385e041c683SAlan Stern blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds return 0; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 390d6062cbbSThomas Graf static int inet_insert_ifa(struct in_ifaddr *ifa) 391d6062cbbSThomas Graf { 392d6062cbbSThomas Graf return __inet_insert_ifa(ifa, NULL, 0); 393d6062cbbSThomas Graf } 394d6062cbbSThomas Graf 3951da177e4SLinus Torvalds static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 3961da177e4SLinus Torvalds { 397e5ed6399SHerbert Xu struct in_device *in_dev = __in_dev_get_rtnl(dev); 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds ASSERT_RTNL(); 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds if (!in_dev) { 4021da177e4SLinus Torvalds in_dev = inetdev_init(dev); 4031da177e4SLinus Torvalds if (!in_dev) { 4041da177e4SLinus Torvalds inet_free_ifa(ifa); 4051da177e4SLinus Torvalds return -ENOBUFS; 4061da177e4SLinus Torvalds } 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds if (ifa->ifa_dev != in_dev) { 4091da177e4SLinus Torvalds BUG_TRAP(!ifa->ifa_dev); 4101da177e4SLinus Torvalds in_dev_hold(in_dev); 4111da177e4SLinus Torvalds ifa->ifa_dev = in_dev; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds if (LOOPBACK(ifa->ifa_local)) 4141da177e4SLinus Torvalds ifa->ifa_scope = RT_SCOPE_HOST; 4151da177e4SLinus Torvalds return inet_insert_ifa(ifa); 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds struct in_device *inetdev_by_index(int ifindex) 4191da177e4SLinus Torvalds { 4201da177e4SLinus Torvalds struct net_device *dev; 4211da177e4SLinus Torvalds struct in_device *in_dev = NULL; 4221da177e4SLinus Torvalds read_lock(&dev_base_lock); 4231da177e4SLinus Torvalds dev = __dev_get_by_index(ifindex); 4241da177e4SLinus Torvalds if (dev) 4251da177e4SLinus Torvalds in_dev = in_dev_get(dev); 4261da177e4SLinus Torvalds read_unlock(&dev_base_lock); 4271da177e4SLinus Torvalds return in_dev; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds /* Called only from RTNL semaphored context. No locks. */ 4311da177e4SLinus Torvalds 43260cad5daSAl Viro struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 43360cad5daSAl Viro __be32 mask) 4341da177e4SLinus Torvalds { 4351da177e4SLinus Torvalds ASSERT_RTNL(); 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds for_primary_ifa(in_dev) { 4381da177e4SLinus Torvalds if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 4391da177e4SLinus Torvalds return ifa; 4401da177e4SLinus Torvalds } endfor_ifa(in_dev); 4411da177e4SLinus Torvalds return NULL; 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 4451da177e4SLinus Torvalds { 446dfdd5fd4SThomas Graf struct nlattr *tb[IFA_MAX+1]; 4471da177e4SLinus Torvalds struct in_device *in_dev; 448dfdd5fd4SThomas Graf struct ifaddrmsg *ifm; 4491da177e4SLinus Torvalds struct in_ifaddr *ifa, **ifap; 450dfdd5fd4SThomas Graf int err = -EINVAL; 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds ASSERT_RTNL(); 4531da177e4SLinus Torvalds 454dfdd5fd4SThomas Graf err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 455dfdd5fd4SThomas Graf if (err < 0) 456dfdd5fd4SThomas Graf goto errout; 457dfdd5fd4SThomas Graf 458dfdd5fd4SThomas Graf ifm = nlmsg_data(nlh); 459dfdd5fd4SThomas Graf in_dev = inetdev_by_index(ifm->ifa_index); 460dfdd5fd4SThomas Graf if (in_dev == NULL) { 461dfdd5fd4SThomas Graf err = -ENODEV; 462dfdd5fd4SThomas Graf goto errout; 463dfdd5fd4SThomas Graf } 464dfdd5fd4SThomas Graf 4651da177e4SLinus Torvalds __in_dev_put(in_dev); 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 4681da177e4SLinus Torvalds ifap = &ifa->ifa_next) { 469dfdd5fd4SThomas Graf if (tb[IFA_LOCAL] && 470a7a628c4SAl Viro ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 4711da177e4SLinus Torvalds continue; 472dfdd5fd4SThomas Graf 473dfdd5fd4SThomas Graf if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 474dfdd5fd4SThomas Graf continue; 475dfdd5fd4SThomas Graf 476dfdd5fd4SThomas Graf if (tb[IFA_ADDRESS] && 477dfdd5fd4SThomas Graf (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 478a7a628c4SAl Viro !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 479dfdd5fd4SThomas Graf continue; 480dfdd5fd4SThomas Graf 481d6062cbbSThomas Graf __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); 4821da177e4SLinus Torvalds return 0; 4831da177e4SLinus Torvalds } 484dfdd5fd4SThomas Graf 485dfdd5fd4SThomas Graf err = -EADDRNOTAVAIL; 486dfdd5fd4SThomas Graf errout: 487dfdd5fd4SThomas Graf return err; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds 4905c753978SThomas Graf static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) 4911da177e4SLinus Torvalds { 4925c753978SThomas Graf struct nlattr *tb[IFA_MAX+1]; 4935c753978SThomas Graf struct in_ifaddr *ifa; 4945c753978SThomas Graf struct ifaddrmsg *ifm; 4951da177e4SLinus Torvalds struct net_device *dev; 4961da177e4SLinus Torvalds struct in_device *in_dev; 4975c753978SThomas Graf int err = -EINVAL; 4981da177e4SLinus Torvalds 4995c753978SThomas Graf err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 5005c753978SThomas Graf if (err < 0) 5015c753978SThomas Graf goto errout; 5021da177e4SLinus Torvalds 5035c753978SThomas Graf ifm = nlmsg_data(nlh); 5045c753978SThomas Graf if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 5055c753978SThomas Graf goto errout; 5061da177e4SLinus Torvalds 5075c753978SThomas Graf dev = __dev_get_by_index(ifm->ifa_index); 5085c753978SThomas Graf if (dev == NULL) { 5095c753978SThomas Graf err = -ENODEV; 5105c753978SThomas Graf goto errout; 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds 5135c753978SThomas Graf in_dev = __in_dev_get_rtnl(dev); 5145c753978SThomas Graf if (in_dev == NULL) { 5155c753978SThomas Graf in_dev = inetdev_init(dev); 5165c753978SThomas Graf if (in_dev == NULL) { 5175c753978SThomas Graf err = -ENOBUFS; 5185c753978SThomas Graf goto errout; 5195c753978SThomas Graf } 5205c753978SThomas Graf } 5211da177e4SLinus Torvalds 5225c753978SThomas Graf ifa = inet_alloc_ifa(); 5235c753978SThomas Graf if (ifa == NULL) { 5245c753978SThomas Graf /* 5255c753978SThomas Graf * A potential indev allocation can be left alive, it stays 5265c753978SThomas Graf * assigned to its device and is destroy with it. 5275c753978SThomas Graf */ 5285c753978SThomas Graf err = -ENOBUFS; 5295c753978SThomas Graf goto errout; 5305c753978SThomas Graf } 5315c753978SThomas Graf 5325c753978SThomas Graf in_dev_hold(in_dev); 5335c753978SThomas Graf 5345c753978SThomas Graf if (tb[IFA_ADDRESS] == NULL) 5355c753978SThomas Graf tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 5365c753978SThomas Graf 5371da177e4SLinus Torvalds ifa->ifa_prefixlen = ifm->ifa_prefixlen; 5381da177e4SLinus Torvalds ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 5391da177e4SLinus Torvalds ifa->ifa_flags = ifm->ifa_flags; 5401da177e4SLinus Torvalds ifa->ifa_scope = ifm->ifa_scope; 5411da177e4SLinus Torvalds ifa->ifa_dev = in_dev; 5425c753978SThomas Graf 543a7a628c4SAl Viro ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 544a7a628c4SAl Viro ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 5455c753978SThomas Graf 5465c753978SThomas Graf if (tb[IFA_BROADCAST]) 547a7a628c4SAl Viro ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 5485c753978SThomas Graf 5495c753978SThomas Graf if (tb[IFA_ANYCAST]) 550a7a628c4SAl Viro ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); 5515c753978SThomas Graf 5525c753978SThomas Graf if (tb[IFA_LABEL]) 5535c753978SThomas Graf nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 5541da177e4SLinus Torvalds else 5551da177e4SLinus Torvalds memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 5561da177e4SLinus Torvalds 5575c753978SThomas Graf return ifa; 5585c753978SThomas Graf 5595c753978SThomas Graf errout: 5605c753978SThomas Graf return ERR_PTR(err); 5615c753978SThomas Graf } 5625c753978SThomas Graf 5635c753978SThomas Graf static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 5645c753978SThomas Graf { 5655c753978SThomas Graf struct in_ifaddr *ifa; 5665c753978SThomas Graf 5675c753978SThomas Graf ASSERT_RTNL(); 5685c753978SThomas Graf 5695c753978SThomas Graf ifa = rtm_to_ifaddr(nlh); 5705c753978SThomas Graf if (IS_ERR(ifa)) 5715c753978SThomas Graf return PTR_ERR(ifa); 5725c753978SThomas Graf 573d6062cbbSThomas Graf return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds /* 5771da177e4SLinus Torvalds * Determine a default network mask, based on the IP address. 5781da177e4SLinus Torvalds */ 5791da177e4SLinus Torvalds 580*714e85beSAl Viro static __inline__ int inet_abc_len(__be32 addr) 5811da177e4SLinus Torvalds { 5821da177e4SLinus Torvalds int rc = -1; /* Something else, probably a multicast. */ 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds if (ZERONET(addr)) 5851da177e4SLinus Torvalds rc = 0; 5861da177e4SLinus Torvalds else { 587*714e85beSAl Viro __u32 haddr = ntohl(addr); 5881da177e4SLinus Torvalds 589*714e85beSAl Viro if (IN_CLASSA(haddr)) 5901da177e4SLinus Torvalds rc = 8; 591*714e85beSAl Viro else if (IN_CLASSB(haddr)) 5921da177e4SLinus Torvalds rc = 16; 593*714e85beSAl Viro else if (IN_CLASSC(haddr)) 5941da177e4SLinus Torvalds rc = 24; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds return rc; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds int devinet_ioctl(unsigned int cmd, void __user *arg) 6021da177e4SLinus Torvalds { 6031da177e4SLinus Torvalds struct ifreq ifr; 6041da177e4SLinus Torvalds struct sockaddr_in sin_orig; 6051da177e4SLinus Torvalds struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 6061da177e4SLinus Torvalds struct in_device *in_dev; 6071da177e4SLinus Torvalds struct in_ifaddr **ifap = NULL; 6081da177e4SLinus Torvalds struct in_ifaddr *ifa = NULL; 6091da177e4SLinus Torvalds struct net_device *dev; 6101da177e4SLinus Torvalds char *colon; 6111da177e4SLinus Torvalds int ret = -EFAULT; 6121da177e4SLinus Torvalds int tryaddrmatch = 0; 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds /* 6151da177e4SLinus Torvalds * Fetch the caller's info block into kernel space 6161da177e4SLinus Torvalds */ 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 6191da177e4SLinus Torvalds goto out; 6201da177e4SLinus Torvalds ifr.ifr_name[IFNAMSIZ - 1] = 0; 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds /* save original address for comparison */ 6231da177e4SLinus Torvalds memcpy(&sin_orig, sin, sizeof(*sin)); 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds colon = strchr(ifr.ifr_name, ':'); 6261da177e4SLinus Torvalds if (colon) 6271da177e4SLinus Torvalds *colon = 0; 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds #ifdef CONFIG_KMOD 6301da177e4SLinus Torvalds dev_load(ifr.ifr_name); 6311da177e4SLinus Torvalds #endif 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds switch(cmd) { 6341da177e4SLinus Torvalds case SIOCGIFADDR: /* Get interface address */ 6351da177e4SLinus Torvalds case SIOCGIFBRDADDR: /* Get the broadcast address */ 6361da177e4SLinus Torvalds case SIOCGIFDSTADDR: /* Get the destination address */ 6371da177e4SLinus Torvalds case SIOCGIFNETMASK: /* Get the netmask for the interface */ 6381da177e4SLinus Torvalds /* Note that these ioctls will not sleep, 6391da177e4SLinus Torvalds so that we do not impose a lock. 6401da177e4SLinus Torvalds One day we will be forced to put shlock here (I mean SMP) 6411da177e4SLinus Torvalds */ 6421da177e4SLinus Torvalds tryaddrmatch = (sin_orig.sin_family == AF_INET); 6431da177e4SLinus Torvalds memset(sin, 0, sizeof(*sin)); 6441da177e4SLinus Torvalds sin->sin_family = AF_INET; 6451da177e4SLinus Torvalds break; 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds case SIOCSIFFLAGS: 6481da177e4SLinus Torvalds ret = -EACCES; 6491da177e4SLinus Torvalds if (!capable(CAP_NET_ADMIN)) 6501da177e4SLinus Torvalds goto out; 6511da177e4SLinus Torvalds break; 6521da177e4SLinus Torvalds case SIOCSIFADDR: /* Set interface address (and family) */ 6531da177e4SLinus Torvalds case SIOCSIFBRDADDR: /* Set the broadcast address */ 6541da177e4SLinus Torvalds case SIOCSIFDSTADDR: /* Set the destination address */ 6551da177e4SLinus Torvalds case SIOCSIFNETMASK: /* Set the netmask for the interface */ 6561da177e4SLinus Torvalds ret = -EACCES; 6571da177e4SLinus Torvalds if (!capable(CAP_NET_ADMIN)) 6581da177e4SLinus Torvalds goto out; 6591da177e4SLinus Torvalds ret = -EINVAL; 6601da177e4SLinus Torvalds if (sin->sin_family != AF_INET) 6611da177e4SLinus Torvalds goto out; 6621da177e4SLinus Torvalds break; 6631da177e4SLinus Torvalds default: 6641da177e4SLinus Torvalds ret = -EINVAL; 6651da177e4SLinus Torvalds goto out; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds rtnl_lock(); 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds ret = -ENODEV; 6711da177e4SLinus Torvalds if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) 6721da177e4SLinus Torvalds goto done; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds if (colon) 6751da177e4SLinus Torvalds *colon = ':'; 6761da177e4SLinus Torvalds 677e5ed6399SHerbert Xu if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { 6781da177e4SLinus Torvalds if (tryaddrmatch) { 6791da177e4SLinus Torvalds /* Matthias Andree */ 6801da177e4SLinus Torvalds /* compare label and address (4.4BSD style) */ 6811da177e4SLinus Torvalds /* note: we only do this for a limited set of ioctls 6821da177e4SLinus Torvalds and only if the original address family was AF_INET. 6831da177e4SLinus Torvalds This is checked above. */ 6841da177e4SLinus Torvalds for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 6851da177e4SLinus Torvalds ifap = &ifa->ifa_next) { 6861da177e4SLinus Torvalds if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 6871da177e4SLinus Torvalds sin_orig.sin_addr.s_addr == 6881da177e4SLinus Torvalds ifa->ifa_address) { 6891da177e4SLinus Torvalds break; /* found */ 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds } 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds /* we didn't get a match, maybe the application is 6941da177e4SLinus Torvalds 4.3BSD-style and passed in junk so we fall back to 6951da177e4SLinus Torvalds comparing just the label */ 6961da177e4SLinus Torvalds if (!ifa) { 6971da177e4SLinus Torvalds for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 6981da177e4SLinus Torvalds ifap = &ifa->ifa_next) 6991da177e4SLinus Torvalds if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 7001da177e4SLinus Torvalds break; 7011da177e4SLinus Torvalds } 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds ret = -EADDRNOTAVAIL; 7051da177e4SLinus Torvalds if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 7061da177e4SLinus Torvalds goto done; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds switch(cmd) { 7091da177e4SLinus Torvalds case SIOCGIFADDR: /* Get interface address */ 7101da177e4SLinus Torvalds sin->sin_addr.s_addr = ifa->ifa_local; 7111da177e4SLinus Torvalds goto rarok; 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds case SIOCGIFBRDADDR: /* Get the broadcast address */ 7141da177e4SLinus Torvalds sin->sin_addr.s_addr = ifa->ifa_broadcast; 7151da177e4SLinus Torvalds goto rarok; 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds case SIOCGIFDSTADDR: /* Get the destination address */ 7181da177e4SLinus Torvalds sin->sin_addr.s_addr = ifa->ifa_address; 7191da177e4SLinus Torvalds goto rarok; 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds case SIOCGIFNETMASK: /* Get the netmask for the interface */ 7221da177e4SLinus Torvalds sin->sin_addr.s_addr = ifa->ifa_mask; 7231da177e4SLinus Torvalds goto rarok; 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds case SIOCSIFFLAGS: 7261da177e4SLinus Torvalds if (colon) { 7271da177e4SLinus Torvalds ret = -EADDRNOTAVAIL; 7281da177e4SLinus Torvalds if (!ifa) 7291da177e4SLinus Torvalds break; 7301da177e4SLinus Torvalds ret = 0; 7311da177e4SLinus Torvalds if (!(ifr.ifr_flags & IFF_UP)) 7321da177e4SLinus Torvalds inet_del_ifa(in_dev, ifap, 1); 7331da177e4SLinus Torvalds break; 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds ret = dev_change_flags(dev, ifr.ifr_flags); 7361da177e4SLinus Torvalds break; 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds case SIOCSIFADDR: /* Set interface address (and family) */ 7391da177e4SLinus Torvalds ret = -EINVAL; 7401da177e4SLinus Torvalds if (inet_abc_len(sin->sin_addr.s_addr) < 0) 7411da177e4SLinus Torvalds break; 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds if (!ifa) { 7441da177e4SLinus Torvalds ret = -ENOBUFS; 7451da177e4SLinus Torvalds if ((ifa = inet_alloc_ifa()) == NULL) 7461da177e4SLinus Torvalds break; 7471da177e4SLinus Torvalds if (colon) 7481da177e4SLinus Torvalds memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 7491da177e4SLinus Torvalds else 7501da177e4SLinus Torvalds memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 7511da177e4SLinus Torvalds } else { 7521da177e4SLinus Torvalds ret = 0; 7531da177e4SLinus Torvalds if (ifa->ifa_local == sin->sin_addr.s_addr) 7541da177e4SLinus Torvalds break; 7551da177e4SLinus Torvalds inet_del_ifa(in_dev, ifap, 0); 7561da177e4SLinus Torvalds ifa->ifa_broadcast = 0; 7571da177e4SLinus Torvalds ifa->ifa_anycast = 0; 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds if (!(dev->flags & IFF_POINTOPOINT)) { 7631da177e4SLinus Torvalds ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 7641da177e4SLinus Torvalds ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 7651da177e4SLinus Torvalds if ((dev->flags & IFF_BROADCAST) && 7661da177e4SLinus Torvalds ifa->ifa_prefixlen < 31) 7671da177e4SLinus Torvalds ifa->ifa_broadcast = ifa->ifa_address | 7681da177e4SLinus Torvalds ~ifa->ifa_mask; 7691da177e4SLinus Torvalds } else { 7701da177e4SLinus Torvalds ifa->ifa_prefixlen = 32; 7711da177e4SLinus Torvalds ifa->ifa_mask = inet_make_mask(32); 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds ret = inet_set_ifa(dev, ifa); 7741da177e4SLinus Torvalds break; 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds case SIOCSIFBRDADDR: /* Set the broadcast address */ 7771da177e4SLinus Torvalds ret = 0; 7781da177e4SLinus Torvalds if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 7791da177e4SLinus Torvalds inet_del_ifa(in_dev, ifap, 0); 7801da177e4SLinus Torvalds ifa->ifa_broadcast = sin->sin_addr.s_addr; 7811da177e4SLinus Torvalds inet_insert_ifa(ifa); 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds break; 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds case SIOCSIFDSTADDR: /* Set the destination address */ 7861da177e4SLinus Torvalds ret = 0; 7871da177e4SLinus Torvalds if (ifa->ifa_address == sin->sin_addr.s_addr) 7881da177e4SLinus Torvalds break; 7891da177e4SLinus Torvalds ret = -EINVAL; 7901da177e4SLinus Torvalds if (inet_abc_len(sin->sin_addr.s_addr) < 0) 7911da177e4SLinus Torvalds break; 7921da177e4SLinus Torvalds ret = 0; 7931da177e4SLinus Torvalds inet_del_ifa(in_dev, ifap, 0); 7941da177e4SLinus Torvalds ifa->ifa_address = sin->sin_addr.s_addr; 7951da177e4SLinus Torvalds inet_insert_ifa(ifa); 7961da177e4SLinus Torvalds break; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds case SIOCSIFNETMASK: /* Set the netmask for the interface */ 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds /* 8011da177e4SLinus Torvalds * The mask we set must be legal. 8021da177e4SLinus Torvalds */ 8031da177e4SLinus Torvalds ret = -EINVAL; 8041da177e4SLinus Torvalds if (bad_mask(sin->sin_addr.s_addr, 0)) 8051da177e4SLinus Torvalds break; 8061da177e4SLinus Torvalds ret = 0; 8071da177e4SLinus Torvalds if (ifa->ifa_mask != sin->sin_addr.s_addr) { 808a144ea4bSAl Viro __be32 old_mask = ifa->ifa_mask; 8091da177e4SLinus Torvalds inet_del_ifa(in_dev, ifap, 0); 8101da177e4SLinus Torvalds ifa->ifa_mask = sin->sin_addr.s_addr; 8111da177e4SLinus Torvalds ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds /* See if current broadcast address matches 8141da177e4SLinus Torvalds * with current netmask, then recalculate 8151da177e4SLinus Torvalds * the broadcast address. Otherwise it's a 8161da177e4SLinus Torvalds * funny address, so don't touch it since 8171da177e4SLinus Torvalds * the user seems to know what (s)he's doing... 8181da177e4SLinus Torvalds */ 8191da177e4SLinus Torvalds if ((dev->flags & IFF_BROADCAST) && 8201da177e4SLinus Torvalds (ifa->ifa_prefixlen < 31) && 8211da177e4SLinus Torvalds (ifa->ifa_broadcast == 822dcab5e1eSDavid Engel (ifa->ifa_local|~old_mask))) { 8231da177e4SLinus Torvalds ifa->ifa_broadcast = (ifa->ifa_local | 8241da177e4SLinus Torvalds ~sin->sin_addr.s_addr); 8251da177e4SLinus Torvalds } 8261da177e4SLinus Torvalds inet_insert_ifa(ifa); 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds break; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds done: 8311da177e4SLinus Torvalds rtnl_unlock(); 8321da177e4SLinus Torvalds out: 8331da177e4SLinus Torvalds return ret; 8341da177e4SLinus Torvalds rarok: 8351da177e4SLinus Torvalds rtnl_unlock(); 8361da177e4SLinus Torvalds ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 8371da177e4SLinus Torvalds goto out; 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 8411da177e4SLinus Torvalds { 842e5ed6399SHerbert Xu struct in_device *in_dev = __in_dev_get_rtnl(dev); 8431da177e4SLinus Torvalds struct in_ifaddr *ifa; 8441da177e4SLinus Torvalds struct ifreq ifr; 8451da177e4SLinus Torvalds int done = 0; 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds if (!in_dev || (ifa = in_dev->ifa_list) == NULL) 8481da177e4SLinus Torvalds goto out; 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds for (; ifa; ifa = ifa->ifa_next) { 8511da177e4SLinus Torvalds if (!buf) { 8521da177e4SLinus Torvalds done += sizeof(ifr); 8531da177e4SLinus Torvalds continue; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds if (len < (int) sizeof(ifr)) 8561da177e4SLinus Torvalds break; 8571da177e4SLinus Torvalds memset(&ifr, 0, sizeof(struct ifreq)); 8581da177e4SLinus Torvalds if (ifa->ifa_label) 8591da177e4SLinus Torvalds strcpy(ifr.ifr_name, ifa->ifa_label); 8601da177e4SLinus Torvalds else 8611da177e4SLinus Torvalds strcpy(ifr.ifr_name, dev->name); 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 8641da177e4SLinus Torvalds (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 8651da177e4SLinus Torvalds ifa->ifa_local; 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 8681da177e4SLinus Torvalds done = -EFAULT; 8691da177e4SLinus Torvalds break; 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds buf += sizeof(struct ifreq); 8721da177e4SLinus Torvalds len -= sizeof(struct ifreq); 8731da177e4SLinus Torvalds done += sizeof(struct ifreq); 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds out: 8761da177e4SLinus Torvalds return done; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 879a61ced5dSAl Viro __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 8801da177e4SLinus Torvalds { 881a61ced5dSAl Viro __be32 addr = 0; 8821da177e4SLinus Torvalds struct in_device *in_dev; 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds rcu_read_lock(); 885e5ed6399SHerbert Xu in_dev = __in_dev_get_rcu(dev); 8861da177e4SLinus Torvalds if (!in_dev) 8871da177e4SLinus Torvalds goto no_in_dev; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds for_primary_ifa(in_dev) { 8901da177e4SLinus Torvalds if (ifa->ifa_scope > scope) 8911da177e4SLinus Torvalds continue; 8921da177e4SLinus Torvalds if (!dst || inet_ifa_match(dst, ifa)) { 8931da177e4SLinus Torvalds addr = ifa->ifa_local; 8941da177e4SLinus Torvalds break; 8951da177e4SLinus Torvalds } 8961da177e4SLinus Torvalds if (!addr) 8971da177e4SLinus Torvalds addr = ifa->ifa_local; 8981da177e4SLinus Torvalds } endfor_ifa(in_dev); 8991da177e4SLinus Torvalds no_in_dev: 9001da177e4SLinus Torvalds rcu_read_unlock(); 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds if (addr) 9031da177e4SLinus Torvalds goto out; 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds /* Not loopback addresses on loopback should be preferred 9061da177e4SLinus Torvalds in this case. It is importnat that lo is the first interface 9071da177e4SLinus Torvalds in dev_base list. 9081da177e4SLinus Torvalds */ 9091da177e4SLinus Torvalds read_lock(&dev_base_lock); 9101da177e4SLinus Torvalds rcu_read_lock(); 9111da177e4SLinus Torvalds for (dev = dev_base; dev; dev = dev->next) { 912e5ed6399SHerbert Xu if ((in_dev = __in_dev_get_rcu(dev)) == NULL) 9131da177e4SLinus Torvalds continue; 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds for_primary_ifa(in_dev) { 9161da177e4SLinus Torvalds if (ifa->ifa_scope != RT_SCOPE_LINK && 9171da177e4SLinus Torvalds ifa->ifa_scope <= scope) { 9181da177e4SLinus Torvalds addr = ifa->ifa_local; 9191da177e4SLinus Torvalds goto out_unlock_both; 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds } endfor_ifa(in_dev); 9221da177e4SLinus Torvalds } 9231da177e4SLinus Torvalds out_unlock_both: 9241da177e4SLinus Torvalds read_unlock(&dev_base_lock); 9251da177e4SLinus Torvalds rcu_read_unlock(); 9261da177e4SLinus Torvalds out: 9271da177e4SLinus Torvalds return addr; 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 93060cad5daSAl Viro static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 93160cad5daSAl Viro __be32 local, int scope) 9321da177e4SLinus Torvalds { 9331da177e4SLinus Torvalds int same = 0; 934a144ea4bSAl Viro __be32 addr = 0; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds for_ifa(in_dev) { 9371da177e4SLinus Torvalds if (!addr && 9381da177e4SLinus Torvalds (local == ifa->ifa_local || !local) && 9391da177e4SLinus Torvalds ifa->ifa_scope <= scope) { 9401da177e4SLinus Torvalds addr = ifa->ifa_local; 9411da177e4SLinus Torvalds if (same) 9421da177e4SLinus Torvalds break; 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds if (!same) { 9451da177e4SLinus Torvalds same = (!local || inet_ifa_match(local, ifa)) && 9461da177e4SLinus Torvalds (!dst || inet_ifa_match(dst, ifa)); 9471da177e4SLinus Torvalds if (same && addr) { 9481da177e4SLinus Torvalds if (local || !dst) 9491da177e4SLinus Torvalds break; 9501da177e4SLinus Torvalds /* Is the selected addr into dst subnet? */ 9511da177e4SLinus Torvalds if (inet_ifa_match(addr, ifa)) 9521da177e4SLinus Torvalds break; 9531da177e4SLinus Torvalds /* No, then can we use new local src? */ 9541da177e4SLinus Torvalds if (ifa->ifa_scope <= scope) { 9551da177e4SLinus Torvalds addr = ifa->ifa_local; 9561da177e4SLinus Torvalds break; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds /* search for large dst subnet for addr */ 9591da177e4SLinus Torvalds same = 0; 9601da177e4SLinus Torvalds } 9611da177e4SLinus Torvalds } 9621da177e4SLinus Torvalds } endfor_ifa(in_dev); 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds return same? addr : 0; 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds /* 9681da177e4SLinus Torvalds * Confirm that local IP address exists using wildcards: 9691da177e4SLinus Torvalds * - dev: only on this interface, 0=any interface 9701da177e4SLinus Torvalds * - dst: only in the same subnet as dst, 0=any dst 9711da177e4SLinus Torvalds * - local: address, 0=autoselect the local address 9721da177e4SLinus Torvalds * - scope: maximum allowed scope value for the local address 9731da177e4SLinus Torvalds */ 97460cad5daSAl Viro __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope) 9751da177e4SLinus Torvalds { 97660cad5daSAl Viro __be32 addr = 0; 9771da177e4SLinus Torvalds struct in_device *in_dev; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds if (dev) { 9801da177e4SLinus Torvalds rcu_read_lock(); 981e5ed6399SHerbert Xu if ((in_dev = __in_dev_get_rcu(dev))) 9821da177e4SLinus Torvalds addr = confirm_addr_indev(in_dev, dst, local, scope); 9831da177e4SLinus Torvalds rcu_read_unlock(); 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds return addr; 9861da177e4SLinus Torvalds } 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds read_lock(&dev_base_lock); 9891da177e4SLinus Torvalds rcu_read_lock(); 9901da177e4SLinus Torvalds for (dev = dev_base; dev; dev = dev->next) { 991e5ed6399SHerbert Xu if ((in_dev = __in_dev_get_rcu(dev))) { 9921da177e4SLinus Torvalds addr = confirm_addr_indev(in_dev, dst, local, scope); 9931da177e4SLinus Torvalds if (addr) 9941da177e4SLinus Torvalds break; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds } 9971da177e4SLinus Torvalds rcu_read_unlock(); 9981da177e4SLinus Torvalds read_unlock(&dev_base_lock); 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds return addr; 10011da177e4SLinus Torvalds } 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds /* 10041da177e4SLinus Torvalds * Device notifier 10051da177e4SLinus Torvalds */ 10061da177e4SLinus Torvalds 10071da177e4SLinus Torvalds int register_inetaddr_notifier(struct notifier_block *nb) 10081da177e4SLinus Torvalds { 1009e041c683SAlan Stern return blocking_notifier_chain_register(&inetaddr_chain, nb); 10101da177e4SLinus Torvalds } 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds int unregister_inetaddr_notifier(struct notifier_block *nb) 10131da177e4SLinus Torvalds { 1014e041c683SAlan Stern return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds /* Rename ifa_labels for a device name change. Make some effort to preserve existing 10181da177e4SLinus Torvalds * alias numbering and to create unique labels if possible. 10191da177e4SLinus Torvalds */ 10201da177e4SLinus Torvalds static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 10211da177e4SLinus Torvalds { 10221da177e4SLinus Torvalds struct in_ifaddr *ifa; 10231da177e4SLinus Torvalds int named = 0; 10241da177e4SLinus Torvalds 10251da177e4SLinus Torvalds for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 10261da177e4SLinus Torvalds char old[IFNAMSIZ], *dot; 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds memcpy(old, ifa->ifa_label, IFNAMSIZ); 10291da177e4SLinus Torvalds memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 10301da177e4SLinus Torvalds if (named++ == 0) 10311da177e4SLinus Torvalds continue; 10321da177e4SLinus Torvalds dot = strchr(ifa->ifa_label, ':'); 10331da177e4SLinus Torvalds if (dot == NULL) { 10341da177e4SLinus Torvalds sprintf(old, ":%d", named); 10351da177e4SLinus Torvalds dot = old; 10361da177e4SLinus Torvalds } 10371da177e4SLinus Torvalds if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { 10381da177e4SLinus Torvalds strcat(ifa->ifa_label, dot); 10391da177e4SLinus Torvalds } else { 10401da177e4SLinus Torvalds strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 10411da177e4SLinus Torvalds } 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds } 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds /* Called only under RTNL semaphore */ 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds static int inetdev_event(struct notifier_block *this, unsigned long event, 10481da177e4SLinus Torvalds void *ptr) 10491da177e4SLinus Torvalds { 10501da177e4SLinus Torvalds struct net_device *dev = ptr; 1051e5ed6399SHerbert Xu struct in_device *in_dev = __in_dev_get_rtnl(dev); 10521da177e4SLinus Torvalds 10531da177e4SLinus Torvalds ASSERT_RTNL(); 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds if (!in_dev) { 10561da177e4SLinus Torvalds if (event == NETDEV_REGISTER && dev == &loopback_dev) { 10571da177e4SLinus Torvalds in_dev = inetdev_init(dev); 10581da177e4SLinus Torvalds if (!in_dev) 10591da177e4SLinus Torvalds panic("devinet: Failed to create loopback\n"); 10601da177e4SLinus Torvalds in_dev->cnf.no_xfrm = 1; 10611da177e4SLinus Torvalds in_dev->cnf.no_policy = 1; 10621da177e4SLinus Torvalds } 10631da177e4SLinus Torvalds goto out; 10641da177e4SLinus Torvalds } 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds switch (event) { 10671da177e4SLinus Torvalds case NETDEV_REGISTER: 10681da177e4SLinus Torvalds printk(KERN_DEBUG "inetdev_event: bug\n"); 10691da177e4SLinus Torvalds dev->ip_ptr = NULL; 10701da177e4SLinus Torvalds break; 10711da177e4SLinus Torvalds case NETDEV_UP: 10721da177e4SLinus Torvalds if (dev->mtu < 68) 10731da177e4SLinus Torvalds break; 10741da177e4SLinus Torvalds if (dev == &loopback_dev) { 10751da177e4SLinus Torvalds struct in_ifaddr *ifa; 10761da177e4SLinus Torvalds if ((ifa = inet_alloc_ifa()) != NULL) { 10771da177e4SLinus Torvalds ifa->ifa_local = 10781da177e4SLinus Torvalds ifa->ifa_address = htonl(INADDR_LOOPBACK); 10791da177e4SLinus Torvalds ifa->ifa_prefixlen = 8; 10801da177e4SLinus Torvalds ifa->ifa_mask = inet_make_mask(8); 10811da177e4SLinus Torvalds in_dev_hold(in_dev); 10821da177e4SLinus Torvalds ifa->ifa_dev = in_dev; 10831da177e4SLinus Torvalds ifa->ifa_scope = RT_SCOPE_HOST; 10841da177e4SLinus Torvalds memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 10851da177e4SLinus Torvalds inet_insert_ifa(ifa); 10861da177e4SLinus Torvalds } 10871da177e4SLinus Torvalds } 10881da177e4SLinus Torvalds ip_mc_up(in_dev); 10891da177e4SLinus Torvalds break; 10901da177e4SLinus Torvalds case NETDEV_DOWN: 10911da177e4SLinus Torvalds ip_mc_down(in_dev); 10921da177e4SLinus Torvalds break; 10931da177e4SLinus Torvalds case NETDEV_CHANGEMTU: 10941da177e4SLinus Torvalds if (dev->mtu >= 68) 10951da177e4SLinus Torvalds break; 10961da177e4SLinus Torvalds /* MTU falled under 68, disable IP */ 10971da177e4SLinus Torvalds case NETDEV_UNREGISTER: 10981da177e4SLinus Torvalds inetdev_destroy(in_dev); 10991da177e4SLinus Torvalds break; 11001da177e4SLinus Torvalds case NETDEV_CHANGENAME: 11011da177e4SLinus Torvalds /* Do not notify about label change, this event is 11021da177e4SLinus Torvalds * not interesting to applications using netlink. 11031da177e4SLinus Torvalds */ 11041da177e4SLinus Torvalds inetdev_changename(dev, in_dev); 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 11071da177e4SLinus Torvalds devinet_sysctl_unregister(&in_dev->cnf); 11081da177e4SLinus Torvalds neigh_sysctl_unregister(in_dev->arp_parms); 11091da177e4SLinus Torvalds neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, 11101da177e4SLinus Torvalds NET_IPV4_NEIGH, "ipv4", NULL, NULL); 11111da177e4SLinus Torvalds devinet_sysctl_register(in_dev, &in_dev->cnf); 11121da177e4SLinus Torvalds #endif 11131da177e4SLinus Torvalds break; 11141da177e4SLinus Torvalds } 11151da177e4SLinus Torvalds out: 11161da177e4SLinus Torvalds return NOTIFY_DONE; 11171da177e4SLinus Torvalds } 11181da177e4SLinus Torvalds 11191da177e4SLinus Torvalds static struct notifier_block ip_netdev_notifier = { 11201da177e4SLinus Torvalds .notifier_call =inetdev_event, 11211da177e4SLinus Torvalds }; 11221da177e4SLinus Torvalds 1123339bf98fSThomas Graf static inline size_t inet_nlmsg_size(void) 1124339bf98fSThomas Graf { 1125339bf98fSThomas Graf return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1126339bf98fSThomas Graf + nla_total_size(4) /* IFA_ADDRESS */ 1127339bf98fSThomas Graf + nla_total_size(4) /* IFA_LOCAL */ 1128339bf98fSThomas Graf + nla_total_size(4) /* IFA_BROADCAST */ 1129339bf98fSThomas Graf + nla_total_size(4) /* IFA_ANYCAST */ 1130339bf98fSThomas Graf + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ 1131339bf98fSThomas Graf } 1132339bf98fSThomas Graf 11331da177e4SLinus Torvalds static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1134b6544c0bSJamal Hadi Salim u32 pid, u32 seq, int event, unsigned int flags) 11351da177e4SLinus Torvalds { 11361da177e4SLinus Torvalds struct ifaddrmsg *ifm; 11371da177e4SLinus Torvalds struct nlmsghdr *nlh; 11381da177e4SLinus Torvalds 113947f68512SThomas Graf nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); 114047f68512SThomas Graf if (nlh == NULL) 114147f68512SThomas Graf return -ENOBUFS; 114247f68512SThomas Graf 114347f68512SThomas Graf ifm = nlmsg_data(nlh); 11441da177e4SLinus Torvalds ifm->ifa_family = AF_INET; 11451da177e4SLinus Torvalds ifm->ifa_prefixlen = ifa->ifa_prefixlen; 11461da177e4SLinus Torvalds ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; 11471da177e4SLinus Torvalds ifm->ifa_scope = ifa->ifa_scope; 11481da177e4SLinus Torvalds ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 11491da177e4SLinus Torvalds 115047f68512SThomas Graf if (ifa->ifa_address) 1151a7a628c4SAl Viro NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); 115247f68512SThomas Graf 115347f68512SThomas Graf if (ifa->ifa_local) 1154a7a628c4SAl Viro NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); 115547f68512SThomas Graf 115647f68512SThomas Graf if (ifa->ifa_broadcast) 1157a7a628c4SAl Viro NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); 115847f68512SThomas Graf 115947f68512SThomas Graf if (ifa->ifa_anycast) 1160a7a628c4SAl Viro NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); 116147f68512SThomas Graf 116247f68512SThomas Graf if (ifa->ifa_label[0]) 116347f68512SThomas Graf NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); 116447f68512SThomas Graf 116547f68512SThomas Graf return nlmsg_end(skb, nlh); 116647f68512SThomas Graf 116747f68512SThomas Graf nla_put_failure: 116847f68512SThomas Graf return nlmsg_cancel(skb, nlh); 11691da177e4SLinus Torvalds } 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 11721da177e4SLinus Torvalds { 11731da177e4SLinus Torvalds int idx, ip_idx; 11741da177e4SLinus Torvalds struct net_device *dev; 11751da177e4SLinus Torvalds struct in_device *in_dev; 11761da177e4SLinus Torvalds struct in_ifaddr *ifa; 11771da177e4SLinus Torvalds int s_ip_idx, s_idx = cb->args[0]; 11781da177e4SLinus Torvalds 11791da177e4SLinus Torvalds s_ip_idx = ip_idx = cb->args[1]; 11801da177e4SLinus Torvalds read_lock(&dev_base_lock); 11811da177e4SLinus Torvalds for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 11821da177e4SLinus Torvalds if (idx < s_idx) 11831da177e4SLinus Torvalds continue; 11841da177e4SLinus Torvalds if (idx > s_idx) 11851da177e4SLinus Torvalds s_ip_idx = 0; 11861da177e4SLinus Torvalds rcu_read_lock(); 1187e5ed6399SHerbert Xu if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 11881da177e4SLinus Torvalds rcu_read_unlock(); 11891da177e4SLinus Torvalds continue; 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 11931da177e4SLinus Torvalds ifa = ifa->ifa_next, ip_idx++) { 11941da177e4SLinus Torvalds if (ip_idx < s_ip_idx) 11951da177e4SLinus Torvalds continue; 11961da177e4SLinus Torvalds if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, 11971da177e4SLinus Torvalds cb->nlh->nlmsg_seq, 1198b6544c0bSJamal Hadi Salim RTM_NEWADDR, NLM_F_MULTI) <= 0) { 11991da177e4SLinus Torvalds rcu_read_unlock(); 12001da177e4SLinus Torvalds goto done; 12011da177e4SLinus Torvalds } 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds rcu_read_unlock(); 12041da177e4SLinus Torvalds } 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds done: 12071da177e4SLinus Torvalds read_unlock(&dev_base_lock); 12081da177e4SLinus Torvalds cb->args[0] = idx; 12091da177e4SLinus Torvalds cb->args[1] = ip_idx; 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds return skb->len; 12121da177e4SLinus Torvalds } 12131da177e4SLinus Torvalds 1214d6062cbbSThomas Graf static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, 1215d6062cbbSThomas Graf u32 pid) 12161da177e4SLinus Torvalds { 121747f68512SThomas Graf struct sk_buff *skb; 1218d6062cbbSThomas Graf u32 seq = nlh ? nlh->nlmsg_seq : 0; 1219d6062cbbSThomas Graf int err = -ENOBUFS; 12201da177e4SLinus Torvalds 1221339bf98fSThomas Graf skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 122247f68512SThomas Graf if (skb == NULL) 1223d6062cbbSThomas Graf goto errout; 1224d6062cbbSThomas Graf 1225d6062cbbSThomas Graf err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); 1226339bf98fSThomas Graf /* failure implies BUG in inet_nlmsg_size() */ 1227339bf98fSThomas Graf BUG_ON(err < 0); 1228d6062cbbSThomas Graf 1229d6062cbbSThomas Graf err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1230d6062cbbSThomas Graf errout: 1231d6062cbbSThomas Graf if (err < 0) 1232d6062cbbSThomas Graf rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err); 12331da177e4SLinus Torvalds } 12341da177e4SLinus Torvalds 1235db46edc6SThomas Graf static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = { 1236db46edc6SThomas Graf [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, }, 1237db46edc6SThomas Graf [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, }, 1238db46edc6SThomas Graf [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, }, 1239db46edc6SThomas Graf [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, }, 1240db46edc6SThomas Graf [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, }, 1241db46edc6SThomas Graf [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute, 1242db46edc6SThomas Graf .dumpit = inet_dump_fib, }, 12431da177e4SLinus Torvalds #ifdef CONFIG_IP_MULTIPLE_TABLES 1244e1ef4bf2SThomas Graf [RTM_GETRULE - RTM_BASE] = { .dumpit = fib4_rules_dump, }, 12451da177e4SLinus Torvalds #endif 12461da177e4SLinus Torvalds }; 12471da177e4SLinus Torvalds 12481da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds void inet_forward_change(void) 12511da177e4SLinus Torvalds { 12521da177e4SLinus Torvalds struct net_device *dev; 12531da177e4SLinus Torvalds int on = ipv4_devconf.forwarding; 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds ipv4_devconf.accept_redirects = !on; 12561da177e4SLinus Torvalds ipv4_devconf_dflt.forwarding = on; 12571da177e4SLinus Torvalds 12581da177e4SLinus Torvalds read_lock(&dev_base_lock); 12591da177e4SLinus Torvalds for (dev = dev_base; dev; dev = dev->next) { 12601da177e4SLinus Torvalds struct in_device *in_dev; 12611da177e4SLinus Torvalds rcu_read_lock(); 1262e5ed6399SHerbert Xu in_dev = __in_dev_get_rcu(dev); 12631da177e4SLinus Torvalds if (in_dev) 12641da177e4SLinus Torvalds in_dev->cnf.forwarding = on; 12651da177e4SLinus Torvalds rcu_read_unlock(); 12661da177e4SLinus Torvalds } 12671da177e4SLinus Torvalds read_unlock(&dev_base_lock); 12681da177e4SLinus Torvalds 12691da177e4SLinus Torvalds rt_cache_flush(0); 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds static int devinet_sysctl_forward(ctl_table *ctl, int write, 12731da177e4SLinus Torvalds struct file* filp, void __user *buffer, 12741da177e4SLinus Torvalds size_t *lenp, loff_t *ppos) 12751da177e4SLinus Torvalds { 12761da177e4SLinus Torvalds int *valp = ctl->data; 12771da177e4SLinus Torvalds int val = *valp; 12781da177e4SLinus Torvalds int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 12791da177e4SLinus Torvalds 12801da177e4SLinus Torvalds if (write && *valp != val) { 12811da177e4SLinus Torvalds if (valp == &ipv4_devconf.forwarding) 12821da177e4SLinus Torvalds inet_forward_change(); 12831da177e4SLinus Torvalds else if (valp != &ipv4_devconf_dflt.forwarding) 12841da177e4SLinus Torvalds rt_cache_flush(0); 12851da177e4SLinus Torvalds } 12861da177e4SLinus Torvalds 12871da177e4SLinus Torvalds return ret; 12881da177e4SLinus Torvalds } 12891da177e4SLinus Torvalds 12901da177e4SLinus Torvalds int ipv4_doint_and_flush(ctl_table *ctl, int write, 12911da177e4SLinus Torvalds struct file* filp, void __user *buffer, 12921da177e4SLinus Torvalds size_t *lenp, loff_t *ppos) 12931da177e4SLinus Torvalds { 12941da177e4SLinus Torvalds int *valp = ctl->data; 12951da177e4SLinus Torvalds int val = *valp; 12961da177e4SLinus Torvalds int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds if (write && *valp != val) 12991da177e4SLinus Torvalds rt_cache_flush(0); 13001da177e4SLinus Torvalds 13011da177e4SLinus Torvalds return ret; 13021da177e4SLinus Torvalds } 13031da177e4SLinus Torvalds 13041da177e4SLinus Torvalds int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, 13051da177e4SLinus Torvalds void __user *oldval, size_t __user *oldlenp, 13061da177e4SLinus Torvalds void __user *newval, size_t newlen, 13071da177e4SLinus Torvalds void **context) 13081da177e4SLinus Torvalds { 13091da177e4SLinus Torvalds int *valp = table->data; 13101da177e4SLinus Torvalds int new; 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds if (!newval || !newlen) 13131da177e4SLinus Torvalds return 0; 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds if (newlen != sizeof(int)) 13161da177e4SLinus Torvalds return -EINVAL; 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds if (get_user(new, (int __user *)newval)) 13191da177e4SLinus Torvalds return -EFAULT; 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds if (new == *valp) 13221da177e4SLinus Torvalds return 0; 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds if (oldval && oldlenp) { 13251da177e4SLinus Torvalds size_t len; 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds if (get_user(len, oldlenp)) 13281da177e4SLinus Torvalds return -EFAULT; 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds if (len) { 13311da177e4SLinus Torvalds if (len > table->maxlen) 13321da177e4SLinus Torvalds len = table->maxlen; 13331da177e4SLinus Torvalds if (copy_to_user(oldval, valp, len)) 13341da177e4SLinus Torvalds return -EFAULT; 13351da177e4SLinus Torvalds if (put_user(len, oldlenp)) 13361da177e4SLinus Torvalds return -EFAULT; 13371da177e4SLinus Torvalds } 13381da177e4SLinus Torvalds } 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds *valp = new; 13411da177e4SLinus Torvalds rt_cache_flush(0); 13421da177e4SLinus Torvalds return 1; 13431da177e4SLinus Torvalds } 13441da177e4SLinus Torvalds 13451da177e4SLinus Torvalds 13461da177e4SLinus Torvalds static struct devinet_sysctl_table { 13471da177e4SLinus Torvalds struct ctl_table_header *sysctl_header; 13481da177e4SLinus Torvalds ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; 13491da177e4SLinus Torvalds ctl_table devinet_dev[2]; 13501da177e4SLinus Torvalds ctl_table devinet_conf_dir[2]; 13511da177e4SLinus Torvalds ctl_table devinet_proto_dir[2]; 13521da177e4SLinus Torvalds ctl_table devinet_root_dir[2]; 13531da177e4SLinus Torvalds } devinet_sysctl = { 13541da177e4SLinus Torvalds .devinet_vars = { 13551da177e4SLinus Torvalds { 13561da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_FORWARDING, 13571da177e4SLinus Torvalds .procname = "forwarding", 13581da177e4SLinus Torvalds .data = &ipv4_devconf.forwarding, 13591da177e4SLinus Torvalds .maxlen = sizeof(int), 13601da177e4SLinus Torvalds .mode = 0644, 13611da177e4SLinus Torvalds .proc_handler = &devinet_sysctl_forward, 13621da177e4SLinus Torvalds }, 13631da177e4SLinus Torvalds { 13641da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_MC_FORWARDING, 13651da177e4SLinus Torvalds .procname = "mc_forwarding", 13661da177e4SLinus Torvalds .data = &ipv4_devconf.mc_forwarding, 13671da177e4SLinus Torvalds .maxlen = sizeof(int), 13681da177e4SLinus Torvalds .mode = 0444, 13691da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 13701da177e4SLinus Torvalds }, 13711da177e4SLinus Torvalds { 13721da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS, 13731da177e4SLinus Torvalds .procname = "accept_redirects", 13741da177e4SLinus Torvalds .data = &ipv4_devconf.accept_redirects, 13751da177e4SLinus Torvalds .maxlen = sizeof(int), 13761da177e4SLinus Torvalds .mode = 0644, 13771da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 13781da177e4SLinus Torvalds }, 13791da177e4SLinus Torvalds { 13801da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS, 13811da177e4SLinus Torvalds .procname = "secure_redirects", 13821da177e4SLinus Torvalds .data = &ipv4_devconf.secure_redirects, 13831da177e4SLinus Torvalds .maxlen = sizeof(int), 13841da177e4SLinus Torvalds .mode = 0644, 13851da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 13861da177e4SLinus Torvalds }, 13871da177e4SLinus Torvalds { 13881da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_SHARED_MEDIA, 13891da177e4SLinus Torvalds .procname = "shared_media", 13901da177e4SLinus Torvalds .data = &ipv4_devconf.shared_media, 13911da177e4SLinus Torvalds .maxlen = sizeof(int), 13921da177e4SLinus Torvalds .mode = 0644, 13931da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 13941da177e4SLinus Torvalds }, 13951da177e4SLinus Torvalds { 13961da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_RP_FILTER, 13971da177e4SLinus Torvalds .procname = "rp_filter", 13981da177e4SLinus Torvalds .data = &ipv4_devconf.rp_filter, 13991da177e4SLinus Torvalds .maxlen = sizeof(int), 14001da177e4SLinus Torvalds .mode = 0644, 14011da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14021da177e4SLinus Torvalds }, 14031da177e4SLinus Torvalds { 14041da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS, 14051da177e4SLinus Torvalds .procname = "send_redirects", 14061da177e4SLinus Torvalds .data = &ipv4_devconf.send_redirects, 14071da177e4SLinus Torvalds .maxlen = sizeof(int), 14081da177e4SLinus Torvalds .mode = 0644, 14091da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14101da177e4SLinus Torvalds }, 14111da177e4SLinus Torvalds { 14121da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, 14131da177e4SLinus Torvalds .procname = "accept_source_route", 14141da177e4SLinus Torvalds .data = &ipv4_devconf.accept_source_route, 14151da177e4SLinus Torvalds .maxlen = sizeof(int), 14161da177e4SLinus Torvalds .mode = 0644, 14171da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14181da177e4SLinus Torvalds }, 14191da177e4SLinus Torvalds { 14201da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_PROXY_ARP, 14211da177e4SLinus Torvalds .procname = "proxy_arp", 14221da177e4SLinus Torvalds .data = &ipv4_devconf.proxy_arp, 14231da177e4SLinus Torvalds .maxlen = sizeof(int), 14241da177e4SLinus Torvalds .mode = 0644, 14251da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14261da177e4SLinus Torvalds }, 14271da177e4SLinus Torvalds { 14281da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_MEDIUM_ID, 14291da177e4SLinus Torvalds .procname = "medium_id", 14301da177e4SLinus Torvalds .data = &ipv4_devconf.medium_id, 14311da177e4SLinus Torvalds .maxlen = sizeof(int), 14321da177e4SLinus Torvalds .mode = 0644, 14331da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14341da177e4SLinus Torvalds }, 14351da177e4SLinus Torvalds { 14361da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_BOOTP_RELAY, 14371da177e4SLinus Torvalds .procname = "bootp_relay", 14381da177e4SLinus Torvalds .data = &ipv4_devconf.bootp_relay, 14391da177e4SLinus Torvalds .maxlen = sizeof(int), 14401da177e4SLinus Torvalds .mode = 0644, 14411da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14421da177e4SLinus Torvalds }, 14431da177e4SLinus Torvalds { 14441da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_LOG_MARTIANS, 14451da177e4SLinus Torvalds .procname = "log_martians", 14461da177e4SLinus Torvalds .data = &ipv4_devconf.log_martians, 14471da177e4SLinus Torvalds .maxlen = sizeof(int), 14481da177e4SLinus Torvalds .mode = 0644, 14491da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14501da177e4SLinus Torvalds }, 14511da177e4SLinus Torvalds { 14521da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_TAG, 14531da177e4SLinus Torvalds .procname = "tag", 14541da177e4SLinus Torvalds .data = &ipv4_devconf.tag, 14551da177e4SLinus Torvalds .maxlen = sizeof(int), 14561da177e4SLinus Torvalds .mode = 0644, 14571da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14581da177e4SLinus Torvalds }, 14591da177e4SLinus Torvalds { 14601da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_ARPFILTER, 14611da177e4SLinus Torvalds .procname = "arp_filter", 14621da177e4SLinus Torvalds .data = &ipv4_devconf.arp_filter, 14631da177e4SLinus Torvalds .maxlen = sizeof(int), 14641da177e4SLinus Torvalds .mode = 0644, 14651da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14661da177e4SLinus Torvalds }, 14671da177e4SLinus Torvalds { 14681da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE, 14691da177e4SLinus Torvalds .procname = "arp_announce", 14701da177e4SLinus Torvalds .data = &ipv4_devconf.arp_announce, 14711da177e4SLinus Torvalds .maxlen = sizeof(int), 14721da177e4SLinus Torvalds .mode = 0644, 14731da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14741da177e4SLinus Torvalds }, 14751da177e4SLinus Torvalds { 14761da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_ARP_IGNORE, 14771da177e4SLinus Torvalds .procname = "arp_ignore", 14781da177e4SLinus Torvalds .data = &ipv4_devconf.arp_ignore, 14791da177e4SLinus Torvalds .maxlen = sizeof(int), 14801da177e4SLinus Torvalds .mode = 0644, 14811da177e4SLinus Torvalds .proc_handler = &proc_dointvec, 14821da177e4SLinus Torvalds }, 14831da177e4SLinus Torvalds { 1484abd596a4SNeil Horman .ctl_name = NET_IPV4_CONF_ARP_ACCEPT, 1485abd596a4SNeil Horman .procname = "arp_accept", 1486abd596a4SNeil Horman .data = &ipv4_devconf.arp_accept, 1487abd596a4SNeil Horman .maxlen = sizeof(int), 1488abd596a4SNeil Horman .mode = 0644, 1489abd596a4SNeil Horman .proc_handler = &proc_dointvec, 1490abd596a4SNeil Horman }, 1491abd596a4SNeil Horman { 14921da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_NOXFRM, 14931da177e4SLinus Torvalds .procname = "disable_xfrm", 14941da177e4SLinus Torvalds .data = &ipv4_devconf.no_xfrm, 14951da177e4SLinus Torvalds .maxlen = sizeof(int), 14961da177e4SLinus Torvalds .mode = 0644, 14971da177e4SLinus Torvalds .proc_handler = &ipv4_doint_and_flush, 14981da177e4SLinus Torvalds .strategy = &ipv4_doint_and_flush_strategy, 14991da177e4SLinus Torvalds }, 15001da177e4SLinus Torvalds { 15011da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_NOPOLICY, 15021da177e4SLinus Torvalds .procname = "disable_policy", 15031da177e4SLinus Torvalds .data = &ipv4_devconf.no_policy, 15041da177e4SLinus Torvalds .maxlen = sizeof(int), 15051da177e4SLinus Torvalds .mode = 0644, 15061da177e4SLinus Torvalds .proc_handler = &ipv4_doint_and_flush, 15071da177e4SLinus Torvalds .strategy = &ipv4_doint_and_flush_strategy, 15081da177e4SLinus Torvalds }, 15091da177e4SLinus Torvalds { 15101da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION, 15111da177e4SLinus Torvalds .procname = "force_igmp_version", 15121da177e4SLinus Torvalds .data = &ipv4_devconf.force_igmp_version, 15131da177e4SLinus Torvalds .maxlen = sizeof(int), 15141da177e4SLinus Torvalds .mode = 0644, 15151da177e4SLinus Torvalds .proc_handler = &ipv4_doint_and_flush, 15161da177e4SLinus Torvalds .strategy = &ipv4_doint_and_flush_strategy, 15171da177e4SLinus Torvalds }, 15188f937c60SHarald Welte { 15198f937c60SHarald Welte .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES, 15208f937c60SHarald Welte .procname = "promote_secondaries", 15218f937c60SHarald Welte .data = &ipv4_devconf.promote_secondaries, 15228f937c60SHarald Welte .maxlen = sizeof(int), 15238f937c60SHarald Welte .mode = 0644, 15248f937c60SHarald Welte .proc_handler = &ipv4_doint_and_flush, 15258f937c60SHarald Welte .strategy = &ipv4_doint_and_flush_strategy, 15268f937c60SHarald Welte }, 15271da177e4SLinus Torvalds }, 15281da177e4SLinus Torvalds .devinet_dev = { 15291da177e4SLinus Torvalds { 15301da177e4SLinus Torvalds .ctl_name = NET_PROTO_CONF_ALL, 15311da177e4SLinus Torvalds .procname = "all", 15321da177e4SLinus Torvalds .mode = 0555, 15331da177e4SLinus Torvalds .child = devinet_sysctl.devinet_vars, 15341da177e4SLinus Torvalds }, 15351da177e4SLinus Torvalds }, 15361da177e4SLinus Torvalds .devinet_conf_dir = { 15371da177e4SLinus Torvalds { 15381da177e4SLinus Torvalds .ctl_name = NET_IPV4_CONF, 15391da177e4SLinus Torvalds .procname = "conf", 15401da177e4SLinus Torvalds .mode = 0555, 15411da177e4SLinus Torvalds .child = devinet_sysctl.devinet_dev, 15421da177e4SLinus Torvalds }, 15431da177e4SLinus Torvalds }, 15441da177e4SLinus Torvalds .devinet_proto_dir = { 15451da177e4SLinus Torvalds { 15461da177e4SLinus Torvalds .ctl_name = NET_IPV4, 15471da177e4SLinus Torvalds .procname = "ipv4", 15481da177e4SLinus Torvalds .mode = 0555, 15491da177e4SLinus Torvalds .child = devinet_sysctl.devinet_conf_dir, 15501da177e4SLinus Torvalds }, 15511da177e4SLinus Torvalds }, 15521da177e4SLinus Torvalds .devinet_root_dir = { 15531da177e4SLinus Torvalds { 15541da177e4SLinus Torvalds .ctl_name = CTL_NET, 15551da177e4SLinus Torvalds .procname = "net", 15561da177e4SLinus Torvalds .mode = 0555, 15571da177e4SLinus Torvalds .child = devinet_sysctl.devinet_proto_dir, 15581da177e4SLinus Torvalds }, 15591da177e4SLinus Torvalds }, 15601da177e4SLinus Torvalds }; 15611da177e4SLinus Torvalds 15621da177e4SLinus Torvalds static void devinet_sysctl_register(struct in_device *in_dev, 15631da177e4SLinus Torvalds struct ipv4_devconf *p) 15641da177e4SLinus Torvalds { 15651da177e4SLinus Torvalds int i; 15661da177e4SLinus Torvalds struct net_device *dev = in_dev ? in_dev->dev : NULL; 15671da177e4SLinus Torvalds struct devinet_sysctl_table *t = kmalloc(sizeof(*t), GFP_KERNEL); 15681da177e4SLinus Torvalds char *dev_name = NULL; 15691da177e4SLinus Torvalds 15701da177e4SLinus Torvalds if (!t) 15711da177e4SLinus Torvalds return; 15721da177e4SLinus Torvalds memcpy(t, &devinet_sysctl, sizeof(*t)); 15731da177e4SLinus Torvalds for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 15741da177e4SLinus Torvalds t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 15751da177e4SLinus Torvalds t->devinet_vars[i].de = NULL; 15761da177e4SLinus Torvalds } 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds if (dev) { 15791da177e4SLinus Torvalds dev_name = dev->name; 15801da177e4SLinus Torvalds t->devinet_dev[0].ctl_name = dev->ifindex; 15811da177e4SLinus Torvalds } else { 15821da177e4SLinus Torvalds dev_name = "default"; 15831da177e4SLinus Torvalds t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 15841da177e4SLinus Torvalds } 15851da177e4SLinus Torvalds 15861da177e4SLinus Torvalds /* 15871da177e4SLinus Torvalds * Make a copy of dev_name, because '.procname' is regarded as const 15881da177e4SLinus Torvalds * by sysctl and we wouldn't want anyone to change it under our feet 15891da177e4SLinus Torvalds * (see SIOCSIFNAME). 15901da177e4SLinus Torvalds */ 1591543537bdSPaulo Marques dev_name = kstrdup(dev_name, GFP_KERNEL); 15921da177e4SLinus Torvalds if (!dev_name) 15931da177e4SLinus Torvalds goto free; 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds t->devinet_dev[0].procname = dev_name; 15961da177e4SLinus Torvalds t->devinet_dev[0].child = t->devinet_vars; 15971da177e4SLinus Torvalds t->devinet_dev[0].de = NULL; 15981da177e4SLinus Torvalds t->devinet_conf_dir[0].child = t->devinet_dev; 15991da177e4SLinus Torvalds t->devinet_conf_dir[0].de = NULL; 16001da177e4SLinus Torvalds t->devinet_proto_dir[0].child = t->devinet_conf_dir; 16011da177e4SLinus Torvalds t->devinet_proto_dir[0].de = NULL; 16021da177e4SLinus Torvalds t->devinet_root_dir[0].child = t->devinet_proto_dir; 16031da177e4SLinus Torvalds t->devinet_root_dir[0].de = NULL; 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0); 16061da177e4SLinus Torvalds if (!t->sysctl_header) 16071da177e4SLinus Torvalds goto free_procname; 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds p->sysctl = t; 16101da177e4SLinus Torvalds return; 16111da177e4SLinus Torvalds 16121da177e4SLinus Torvalds /* error path */ 16131da177e4SLinus Torvalds free_procname: 16141da177e4SLinus Torvalds kfree(dev_name); 16151da177e4SLinus Torvalds free: 16161da177e4SLinus Torvalds kfree(t); 16171da177e4SLinus Torvalds return; 16181da177e4SLinus Torvalds } 16191da177e4SLinus Torvalds 16201da177e4SLinus Torvalds static void devinet_sysctl_unregister(struct ipv4_devconf *p) 16211da177e4SLinus Torvalds { 16221da177e4SLinus Torvalds if (p->sysctl) { 16231da177e4SLinus Torvalds struct devinet_sysctl_table *t = p->sysctl; 16241da177e4SLinus Torvalds p->sysctl = NULL; 16251da177e4SLinus Torvalds unregister_sysctl_table(t->sysctl_header); 16261da177e4SLinus Torvalds kfree(t->devinet_dev[0].procname); 16271da177e4SLinus Torvalds kfree(t); 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds } 16301da177e4SLinus Torvalds #endif 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds void __init devinet_init(void) 16331da177e4SLinus Torvalds { 16341da177e4SLinus Torvalds register_gifconf(PF_INET, inet_gifconf); 16351da177e4SLinus Torvalds register_netdevice_notifier(&ip_netdev_notifier); 16361da177e4SLinus Torvalds rtnetlink_links[PF_INET] = inet_rtnetlink_table; 16371da177e4SLinus Torvalds #ifdef CONFIG_SYSCTL 16381da177e4SLinus Torvalds devinet_sysctl.sysctl_header = 16391da177e4SLinus Torvalds register_sysctl_table(devinet_sysctl.devinet_root_dir, 0); 16401da177e4SLinus Torvalds devinet_sysctl_register(NULL, &ipv4_devconf_dflt); 16411da177e4SLinus Torvalds #endif 16421da177e4SLinus Torvalds } 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds EXPORT_SYMBOL(in_dev_finish_destroy); 16451da177e4SLinus Torvalds EXPORT_SYMBOL(inet_select_addr); 16461da177e4SLinus Torvalds EXPORT_SYMBOL(inetdev_by_index); 16471da177e4SLinus Torvalds EXPORT_SYMBOL(register_inetaddr_notifier); 16481da177e4SLinus Torvalds EXPORT_SYMBOL(unregister_inetaddr_notifier); 1649