From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- net/ipv4/devinet.c | 1508 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1508 insertions(+) create mode 100644 net/ipv4/devinet.c (limited to 'net/ipv4/devinet.c') diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c new file mode 100644 index 0000000..eea7ef0 --- /dev/null +++ b/net/ipv4/devinet.c @@ -0,0 +1,1508 @@ +/* + * NET3 IP device support routines. + * + * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $ + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Derived from the IP parts of dev.c 1.0.19 + * Authors: Ross Biro, + * Fred N. van Kempen, + * Mark Evans, + * + * Additional Authors: + * Alan Cox, + * Alexey Kuznetsov, + * + * Changes: + * Alexey Kuznetsov: pa_* fields are replaced with ifaddr + * lists. + * Cyrus Durgin: updated for kmod + * Matthias Andree: in devinet_ioctl, compare label and + * address (4.4BSD alias style support), + * fall back to comparing just the label + * if no match found. + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#ifdef CONFIG_SYSCTL +#include +#endif +#include + +#include +#include +#include + +struct ipv4_devconf ipv4_devconf = { + .accept_redirects = 1, + .send_redirects = 1, + .secure_redirects = 1, + .shared_media = 1, +}; + +static struct ipv4_devconf ipv4_devconf_dflt = { + .accept_redirects = 1, + .send_redirects = 1, + .secure_redirects = 1, + .shared_media = 1, + .accept_source_route = 1, +}; + +static void rtmsg_ifa(int event, struct in_ifaddr *); + +static struct notifier_block *inetaddr_chain; +static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, + int destroy); +#ifdef CONFIG_SYSCTL +static void devinet_sysctl_register(struct in_device *in_dev, + struct ipv4_devconf *p); +static void devinet_sysctl_unregister(struct ipv4_devconf *p); +#endif + +/* Locks all the inet devices. */ + +static struct in_ifaddr *inet_alloc_ifa(void) +{ + struct in_ifaddr *ifa = kmalloc(sizeof(*ifa), GFP_KERNEL); + + if (ifa) { + memset(ifa, 0, sizeof(*ifa)); + INIT_RCU_HEAD(&ifa->rcu_head); + } + + return ifa; +} + +static void inet_rcu_free_ifa(struct rcu_head *head) +{ + struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); + if (ifa->ifa_dev) + in_dev_put(ifa->ifa_dev); + kfree(ifa); +} + +static inline void inet_free_ifa(struct in_ifaddr *ifa) +{ + call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); +} + +void in_dev_finish_destroy(struct in_device *idev) +{ + struct net_device *dev = idev->dev; + + BUG_TRAP(!idev->ifa_list); + BUG_TRAP(!idev->mc_list); +#ifdef NET_REFCNT_DEBUG + printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", + idev, dev ? dev->name : "NIL"); +#endif + dev_put(dev); + if (!idev->dead) + printk("Freeing alive in_device %p\n", idev); + else { + kfree(idev); + } +} + +struct in_device *inetdev_init(struct net_device *dev) +{ + struct in_device *in_dev; + + ASSERT_RTNL(); + + in_dev = kmalloc(sizeof(*in_dev), GFP_KERNEL); + if (!in_dev) + goto out; + memset(in_dev, 0, sizeof(*in_dev)); + INIT_RCU_HEAD(&in_dev->rcu_head); + memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); + in_dev->cnf.sysctl = NULL; + in_dev->dev = dev; + if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) + goto out_kfree; + /* Reference in_dev->dev */ + dev_hold(dev); +#ifdef CONFIG_SYSCTL + neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, + NET_IPV4_NEIGH, "ipv4", NULL, NULL); +#endif + + /* Account for reference dev->ip_ptr */ + in_dev_hold(in_dev); + rcu_assign_pointer(dev->ip_ptr, in_dev); + +#ifdef CONFIG_SYSCTL + devinet_sysctl_register(in_dev, &in_dev->cnf); +#endif + ip_mc_init_dev(in_dev); + if (dev->flags & IFF_UP) + ip_mc_up(in_dev); +out: + return in_dev; +out_kfree: + kfree(in_dev); + in_dev = NULL; + goto out; +} + +static void in_dev_rcu_put(struct rcu_head *head) +{ + struct in_device *idev = container_of(head, struct in_device, rcu_head); + in_dev_put(idev); +} + +static void inetdev_destroy(struct in_device *in_dev) +{ + struct in_ifaddr *ifa; + struct net_device *dev; + + ASSERT_RTNL(); + + dev = in_dev->dev; + if (dev == &loopback_dev) + return; + + in_dev->dead = 1; + + ip_mc_destroy_dev(in_dev); + + while ((ifa = in_dev->ifa_list) != NULL) { + inet_del_ifa(in_dev, &in_dev->ifa_list, 0); + inet_free_ifa(ifa); + } + +#ifdef CONFIG_SYSCTL + devinet_sysctl_unregister(&in_dev->cnf); +#endif + + dev->ip_ptr = NULL; + +#ifdef CONFIG_SYSCTL + neigh_sysctl_unregister(in_dev->arp_parms); +#endif + neigh_parms_release(&arp_tbl, in_dev->arp_parms); + arp_ifdown(dev); + + call_rcu(&in_dev->rcu_head, in_dev_rcu_put); +} + +int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b) +{ + rcu_read_lock(); + for_primary_ifa(in_dev) { + if (inet_ifa_match(a, ifa)) { + if (!b || inet_ifa_match(b, ifa)) { + rcu_read_unlock(); + return 1; + } + } + } endfor_ifa(in_dev); + rcu_read_unlock(); + return 0; +} + +static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, + int destroy) +{ + struct in_ifaddr *ifa1 = *ifap; + + ASSERT_RTNL(); + + /* 1. Deleting primary ifaddr forces deletion all secondaries */ + + if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { + struct in_ifaddr *ifa; + struct in_ifaddr **ifap1 = &ifa1->ifa_next; + + while ((ifa = *ifap1) != NULL) { + if (!(ifa->ifa_flags & IFA_F_SECONDARY) || + ifa1->ifa_mask != ifa->ifa_mask || + !inet_ifa_match(ifa1->ifa_address, ifa)) { + ifap1 = &ifa->ifa_next; + continue; + } + + *ifap1 = ifa->ifa_next; + + rtmsg_ifa(RTM_DELADDR, ifa); + notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa); + inet_free_ifa(ifa); + } + } + + /* 2. Unlink it */ + + *ifap = ifa1->ifa_next; + + /* 3. Announce address deletion */ + + /* Send message first, then call notifier. + At first sight, FIB update triggered by notifier + will refer to already deleted ifaddr, that could confuse + netlink listeners. It is not true: look, gated sees + that route deleted and if it still thinks that ifaddr + is valid, it will try to restore deleted routes... Grr. + So that, this order is correct. + */ + rtmsg_ifa(RTM_DELADDR, ifa1); + notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); + if (destroy) { + inet_free_ifa(ifa1); + + if (!in_dev->ifa_list) + inetdev_destroy(in_dev); + } +} + +static int inet_insert_ifa(struct in_ifaddr *ifa) +{ + struct in_device *in_dev = ifa->ifa_dev; + struct in_ifaddr *ifa1, **ifap, **last_primary; + + ASSERT_RTNL(); + + if (!ifa->ifa_local) { + inet_free_ifa(ifa); + return 0; + } + + ifa->ifa_flags &= ~IFA_F_SECONDARY; + last_primary = &in_dev->ifa_list; + + for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; + ifap = &ifa1->ifa_next) { + if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && + ifa->ifa_scope <= ifa1->ifa_scope) + last_primary = &ifa1->ifa_next; + if (ifa1->ifa_mask == ifa->ifa_mask && + inet_ifa_match(ifa1->ifa_address, ifa)) { + if (ifa1->ifa_local == ifa->ifa_local) { + inet_free_ifa(ifa); + return -EEXIST; + } + if (ifa1->ifa_scope != ifa->ifa_scope) { + inet_free_ifa(ifa); + return -EINVAL; + } + ifa->ifa_flags |= IFA_F_SECONDARY; + } + } + + if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { + net_srandom(ifa->ifa_local); + ifap = last_primary; + } + + ifa->ifa_next = *ifap; + *ifap = ifa; + + /* Send message first, then call notifier. + Notifier will trigger FIB update, so that + listeners of netlink will know about new ifaddr */ + rtmsg_ifa(RTM_NEWADDR, ifa); + notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); + + return 0; +} + +static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) +{ + struct in_device *in_dev = __in_dev_get(dev); + + ASSERT_RTNL(); + + if (!in_dev) { + in_dev = inetdev_init(dev); + if (!in_dev) { + inet_free_ifa(ifa); + return -ENOBUFS; + } + } + if (ifa->ifa_dev != in_dev) { + BUG_TRAP(!ifa->ifa_dev); + in_dev_hold(in_dev); + ifa->ifa_dev = in_dev; + } + if (LOOPBACK(ifa->ifa_local)) + ifa->ifa_scope = RT_SCOPE_HOST; + return inet_insert_ifa(ifa); +} + +struct in_device *inetdev_by_index(int ifindex) +{ + struct net_device *dev; + struct in_device *in_dev = NULL; + read_lock(&dev_base_lock); + dev = __dev_get_by_index(ifindex); + if (dev) + in_dev = in_dev_get(dev); + read_unlock(&dev_base_lock); + return in_dev; +} + +/* Called only from RTNL semaphored context. No locks. */ + +struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, + u32 mask) +{ + ASSERT_RTNL(); + + for_primary_ifa(in_dev) { + if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) + return ifa; + } endfor_ifa(in_dev); + return NULL; +} + +static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) +{ + struct rtattr **rta = arg; + struct in_device *in_dev; + struct ifaddrmsg *ifm = NLMSG_DATA(nlh); + struct in_ifaddr *ifa, **ifap; + + ASSERT_RTNL(); + + if ((in_dev = inetdev_by_index(ifm->ifa_index)) == NULL) + goto out; + __in_dev_put(in_dev); + + for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; + ifap = &ifa->ifa_next) { + if ((rta[IFA_LOCAL - 1] && + memcmp(RTA_DATA(rta[IFA_LOCAL - 1]), + &ifa->ifa_local, 4)) || + (rta[IFA_LABEL - 1] && + rtattr_strcmp(rta[IFA_LABEL - 1], ifa->ifa_label)) || + (rta[IFA_ADDRESS - 1] && + (ifm->ifa_prefixlen != ifa->ifa_prefixlen || + !inet_ifa_match(*(u32*)RTA_DATA(rta[IFA_ADDRESS - 1]), + ifa)))) + continue; + inet_del_ifa(in_dev, ifap, 1); + return 0; + } +out: + return -EADDRNOTAVAIL; +} + +static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) +{ + struct rtattr **rta = arg; + struct net_device *dev; + struct in_device *in_dev; + struct ifaddrmsg *ifm = NLMSG_DATA(nlh); + struct in_ifaddr *ifa; + int rc = -EINVAL; + + ASSERT_RTNL(); + + if (ifm->ifa_prefixlen > 32 || !rta[IFA_LOCAL - 1]) + goto out; + + rc = -ENODEV; + if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL) + goto out; + + rc = -ENOBUFS; + if ((in_dev = __in_dev_get(dev)) == NULL) { + in_dev = inetdev_init(dev); + if (!in_dev) + goto out; + } + + if ((ifa = inet_alloc_ifa()) == NULL) + goto out; + + if (!rta[IFA_ADDRESS - 1]) + rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1]; + memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL - 1]), 4); + memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS - 1]), 4); + ifa->ifa_prefixlen = ifm->ifa_prefixlen; + ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); + if (rta[IFA_BROADCAST - 1]) + memcpy(&ifa->ifa_broadcast, + RTA_DATA(rta[IFA_BROADCAST - 1]), 4); + if (rta[IFA_ANYCAST - 1]) + memcpy(&ifa->ifa_anycast, RTA_DATA(rta[IFA_ANYCAST - 1]), 4); + ifa->ifa_flags = ifm->ifa_flags; + ifa->ifa_scope = ifm->ifa_scope; + in_dev_hold(in_dev); + ifa->ifa_dev = in_dev; + if (rta[IFA_LABEL - 1]) + rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL - 1], IFNAMSIZ); + else + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + + rc = inet_insert_ifa(ifa); +out: + return rc; +} + +/* + * Determine a default network mask, based on the IP address. + */ + +static __inline__ int inet_abc_len(u32 addr) +{ + int rc = -1; /* Something else, probably a multicast. */ + + if (ZERONET(addr)) + rc = 0; + else { + addr = ntohl(addr); + + if (IN_CLASSA(addr)) + rc = 8; + else if (IN_CLASSB(addr)) + rc = 16; + else if (IN_CLASSC(addr)) + rc = 24; + } + + return rc; +} + + +int devinet_ioctl(unsigned int cmd, void __user *arg) +{ + struct ifreq ifr; + struct sockaddr_in sin_orig; + struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; + struct in_device *in_dev; + struct in_ifaddr **ifap = NULL; + struct in_ifaddr *ifa = NULL; + struct net_device *dev; + char *colon; + int ret = -EFAULT; + int tryaddrmatch = 0; + + /* + * Fetch the caller's info block into kernel space + */ + + if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) + goto out; + ifr.ifr_name[IFNAMSIZ - 1] = 0; + + /* save original address for comparison */ + memcpy(&sin_orig, sin, sizeof(*sin)); + + colon = strchr(ifr.ifr_name, ':'); + if (colon) + *colon = 0; + +#ifdef CONFIG_KMOD + dev_load(ifr.ifr_name); +#endif + + switch(cmd) { + case SIOCGIFADDR: /* Get interface address */ + case SIOCGIFBRDADDR: /* Get the broadcast address */ + case SIOCGIFDSTADDR: /* Get the destination address */ + case SIOCGIFNETMASK: /* Get the netmask for the interface */ + /* Note that these ioctls will not sleep, + so that we do not impose a lock. + One day we will be forced to put shlock here (I mean SMP) + */ + tryaddrmatch = (sin_orig.sin_family == AF_INET); + memset(sin, 0, sizeof(*sin)); + sin->sin_family = AF_INET; + break; + + case SIOCSIFFLAGS: + ret = -EACCES; + if (!capable(CAP_NET_ADMIN)) + goto out; + break; + case SIOCSIFADDR: /* Set interface address (and family) */ + case SIOCSIFBRDADDR: /* Set the broadcast address */ + case SIOCSIFDSTADDR: /* Set the destination address */ + case SIOCSIFNETMASK: /* Set the netmask for the interface */ + ret = -EACCES; + if (!capable(CAP_NET_ADMIN)) + goto out; + ret = -EINVAL; + if (sin->sin_family != AF_INET) + goto out; + break; + default: + ret = -EINVAL; + goto out; + } + + rtnl_lock(); + + ret = -ENODEV; + if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) + goto done; + + if (colon) + *colon = ':'; + + if ((in_dev = __in_dev_get(dev)) != NULL) { + if (tryaddrmatch) { + /* Matthias Andree */ + /* compare label and address (4.4BSD style) */ + /* note: we only do this for a limited set of ioctls + and only if the original address family was AF_INET. + This is checked above. */ + for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; + ifap = &ifa->ifa_next) { + if (!strcmp(ifr.ifr_name, ifa->ifa_label) && + sin_orig.sin_addr.s_addr == + ifa->ifa_address) { + break; /* found */ + } + } + } + /* we didn't get a match, maybe the application is + 4.3BSD-style and passed in junk so we fall back to + comparing just the label */ + if (!ifa) { + for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; + ifap = &ifa->ifa_next) + if (!strcmp(ifr.ifr_name, ifa->ifa_label)) + break; + } + } + + ret = -EADDRNOTAVAIL; + if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) + goto done; + + switch(cmd) { + case SIOCGIFADDR: /* Get interface address */ + sin->sin_addr.s_addr = ifa->ifa_local; + goto rarok; + + case SIOCGIFBRDADDR: /* Get the broadcast address */ + sin->sin_addr.s_addr = ifa->ifa_broadcast; + goto rarok; + + case SIOCGIFDSTADDR: /* Get the destination address */ + sin->sin_addr.s_addr = ifa->ifa_address; + goto rarok; + + case SIOCGIFNETMASK: /* Get the netmask for the interface */ + sin->sin_addr.s_addr = ifa->ifa_mask; + goto rarok; + + case SIOCSIFFLAGS: + if (colon) { + ret = -EADDRNOTAVAIL; + if (!ifa) + break; + ret = 0; + if (!(ifr.ifr_flags & IFF_UP)) + inet_del_ifa(in_dev, ifap, 1); + break; + } + ret = dev_change_flags(dev, ifr.ifr_flags); + break; + + case SIOCSIFADDR: /* Set interface address (and family) */ + ret = -EINVAL; + if (inet_abc_len(sin->sin_addr.s_addr) < 0) + break; + + if (!ifa) { + ret = -ENOBUFS; + if ((ifa = inet_alloc_ifa()) == NULL) + break; + if (colon) + memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); + else + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + } else { + ret = 0; + if (ifa->ifa_local == sin->sin_addr.s_addr) + break; + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_broadcast = 0; + ifa->ifa_anycast = 0; + } + + ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; + + if (!(dev->flags & IFF_POINTOPOINT)) { + ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); + ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); + if ((dev->flags & IFF_BROADCAST) && + ifa->ifa_prefixlen < 31) + ifa->ifa_broadcast = ifa->ifa_address | + ~ifa->ifa_mask; + } else { + ifa->ifa_prefixlen = 32; + ifa->ifa_mask = inet_make_mask(32); + } + ret = inet_set_ifa(dev, ifa); + break; + + case SIOCSIFBRDADDR: /* Set the broadcast address */ + ret = 0; + if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_broadcast = sin->sin_addr.s_addr; + inet_insert_ifa(ifa); + } + break; + + case SIOCSIFDSTADDR: /* Set the destination address */ + ret = 0; + if (ifa->ifa_address == sin->sin_addr.s_addr) + break; + ret = -EINVAL; + if (inet_abc_len(sin->sin_addr.s_addr) < 0) + break; + ret = 0; + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_address = sin->sin_addr.s_addr; + inet_insert_ifa(ifa); + break; + + case SIOCSIFNETMASK: /* Set the netmask for the interface */ + + /* + * The mask we set must be legal. + */ + ret = -EINVAL; + if (bad_mask(sin->sin_addr.s_addr, 0)) + break; + ret = 0; + if (ifa->ifa_mask != sin->sin_addr.s_addr) { + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_mask = sin->sin_addr.s_addr; + ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); + + /* See if current broadcast address matches + * with current netmask, then recalculate + * the broadcast address. Otherwise it's a + * funny address, so don't touch it since + * the user seems to know what (s)he's doing... + */ + if ((dev->flags & IFF_BROADCAST) && + (ifa->ifa_prefixlen < 31) && + (ifa->ifa_broadcast == + (ifa->ifa_local|~ifa->ifa_mask))) { + ifa->ifa_broadcast = (ifa->ifa_local | + ~sin->sin_addr.s_addr); + } + inet_insert_ifa(ifa); + } + break; + } +done: + rtnl_unlock(); +out: + return ret; +rarok: + rtnl_unlock(); + ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; + goto out; +} + +static int inet_gifconf(struct net_device *dev, char __user *buf, int len) +{ + struct in_device *in_dev = __in_dev_get(dev); + struct in_ifaddr *ifa; + struct ifreq ifr; + int done = 0; + + if (!in_dev || (ifa = in_dev->ifa_list) == NULL) + goto out; + + for (; ifa; ifa = ifa->ifa_next) { + if (!buf) { + done += sizeof(ifr); + continue; + } + if (len < (int) sizeof(ifr)) + break; + memset(&ifr, 0, sizeof(struct ifreq)); + if (ifa->ifa_label) + strcpy(ifr.ifr_name, ifa->ifa_label); + else + strcpy(ifr.ifr_name, dev->name); + + (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; + (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = + ifa->ifa_local; + + if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { + done = -EFAULT; + break; + } + buf += sizeof(struct ifreq); + len -= sizeof(struct ifreq); + done += sizeof(struct ifreq); + } +out: + return done; +} + +u32 inet_select_addr(const struct net_device *dev, u32 dst, int scope) +{ + u32 addr = 0; + struct in_device *in_dev; + + rcu_read_lock(); + in_dev = __in_dev_get(dev); + if (!in_dev) + goto no_in_dev; + + for_primary_ifa(in_dev) { + if (ifa->ifa_scope > scope) + continue; + if (!dst || inet_ifa_match(dst, ifa)) { + addr = ifa->ifa_local; + break; + } + if (!addr) + addr = ifa->ifa_local; + } endfor_ifa(in_dev); +no_in_dev: + rcu_read_unlock(); + + if (addr) + goto out; + + /* Not loopback addresses on loopback should be preferred + in this case. It is importnat that lo is the first interface + in dev_base list. + */ + read_lock(&dev_base_lock); + rcu_read_lock(); + for (dev = dev_base; dev; dev = dev->next) { + if ((in_dev = __in_dev_get(dev)) == NULL) + continue; + + for_primary_ifa(in_dev) { + if (ifa->ifa_scope != RT_SCOPE_LINK && + ifa->ifa_scope <= scope) { + addr = ifa->ifa_local; + goto out_unlock_both; + } + } endfor_ifa(in_dev); + } +out_unlock_both: + read_unlock(&dev_base_lock); + rcu_read_unlock(); +out: + return addr; +} + +static u32 confirm_addr_indev(struct in_device *in_dev, u32 dst, + u32 local, int scope) +{ + int same = 0; + u32 addr = 0; + + for_ifa(in_dev) { + if (!addr && + (local == ifa->ifa_local || !local) && + ifa->ifa_scope <= scope) { + addr = ifa->ifa_local; + if (same) + break; + } + if (!same) { + same = (!local || inet_ifa_match(local, ifa)) && + (!dst || inet_ifa_match(dst, ifa)); + if (same && addr) { + if (local || !dst) + break; + /* Is the selected addr into dst subnet? */ + if (inet_ifa_match(addr, ifa)) + break; + /* No, then can we use new local src? */ + if (ifa->ifa_scope <= scope) { + addr = ifa->ifa_local; + break; + } + /* search for large dst subnet for addr */ + same = 0; + } + } + } endfor_ifa(in_dev); + + return same? addr : 0; +} + +/* + * Confirm that local IP address exists using wildcards: + * - dev: only on this interface, 0=any interface + * - dst: only in the same subnet as dst, 0=any dst + * - local: address, 0=autoselect the local address + * - scope: maximum allowed scope value for the local address + */ +u32 inet_confirm_addr(const struct net_device *dev, u32 dst, u32 local, int scope) +{ + u32 addr = 0; + struct in_device *in_dev; + + if (dev) { + rcu_read_lock(); + if ((in_dev = __in_dev_get(dev))) + addr = confirm_addr_indev(in_dev, dst, local, scope); + rcu_read_unlock(); + + return addr; + } + + read_lock(&dev_base_lock); + rcu_read_lock(); + for (dev = dev_base; dev; dev = dev->next) { + if ((in_dev = __in_dev_get(dev))) { + addr = confirm_addr_indev(in_dev, dst, local, scope); + if (addr) + break; + } + } + rcu_read_unlock(); + read_unlock(&dev_base_lock); + + return addr; +} + +/* + * Device notifier + */ + +int register_inetaddr_notifier(struct notifier_block *nb) +{ + return notifier_chain_register(&inetaddr_chain, nb); +} + +int unregister_inetaddr_notifier(struct notifier_block *nb) +{ + return notifier_chain_unregister(&inetaddr_chain, nb); +} + +/* Rename ifa_labels for a device name change. Make some effort to preserve existing + * alias numbering and to create unique labels if possible. +*/ +static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) +{ + struct in_ifaddr *ifa; + int named = 0; + + for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { + char old[IFNAMSIZ], *dot; + + memcpy(old, ifa->ifa_label, IFNAMSIZ); + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + if (named++ == 0) + continue; + dot = strchr(ifa->ifa_label, ':'); + if (dot == NULL) { + sprintf(old, ":%d", named); + dot = old; + } + if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { + strcat(ifa->ifa_label, dot); + } else { + strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); + } + } +} + +/* Called only under RTNL semaphore */ + +static int inetdev_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct net_device *dev = ptr; + struct in_device *in_dev = __in_dev_get(dev); + + ASSERT_RTNL(); + + if (!in_dev) { + if (event == NETDEV_REGISTER && dev == &loopback_dev) { + in_dev = inetdev_init(dev); + if (!in_dev) + panic("devinet: Failed to create loopback\n"); + in_dev->cnf.no_xfrm = 1; + in_dev->cnf.no_policy = 1; + } + goto out; + } + + switch (event) { + case NETDEV_REGISTER: + printk(KERN_DEBUG "inetdev_event: bug\n"); + dev->ip_ptr = NULL; + break; + case NETDEV_UP: + if (dev->mtu < 68) + break; + if (dev == &loopback_dev) { + struct in_ifaddr *ifa; + if ((ifa = inet_alloc_ifa()) != NULL) { + ifa->ifa_local = + ifa->ifa_address = htonl(INADDR_LOOPBACK); + ifa->ifa_prefixlen = 8; + ifa->ifa_mask = inet_make_mask(8); + in_dev_hold(in_dev); + ifa->ifa_dev = in_dev; + ifa->ifa_scope = RT_SCOPE_HOST; + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + inet_insert_ifa(ifa); + } + } + ip_mc_up(in_dev); + break; + case NETDEV_DOWN: + ip_mc_down(in_dev); + break; + case NETDEV_CHANGEMTU: + if (dev->mtu >= 68) + break; + /* MTU falled under 68, disable IP */ + case NETDEV_UNREGISTER: + inetdev_destroy(in_dev); + break; + case NETDEV_CHANGENAME: + /* Do not notify about label change, this event is + * not interesting to applications using netlink. + */ + inetdev_changename(dev, in_dev); + +#ifdef CONFIG_SYSCTL + devinet_sysctl_unregister(&in_dev->cnf); + neigh_sysctl_unregister(in_dev->arp_parms); + neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, + NET_IPV4_NEIGH, "ipv4", NULL, NULL); + devinet_sysctl_register(in_dev, &in_dev->cnf); +#endif + break; + } +out: + return NOTIFY_DONE; +} + +static struct notifier_block ip_netdev_notifier = { + .notifier_call =inetdev_event, +}; + +static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, + u32 pid, u32 seq, int event) +{ + struct ifaddrmsg *ifm; + struct nlmsghdr *nlh; + unsigned char *b = skb->tail; + + nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm)); + if (pid) nlh->nlmsg_flags |= NLM_F_MULTI; + ifm = NLMSG_DATA(nlh); + ifm->ifa_family = AF_INET; + ifm->ifa_prefixlen = ifa->ifa_prefixlen; + ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; + ifm->ifa_scope = ifa->ifa_scope; + ifm->ifa_index = ifa->ifa_dev->dev->ifindex; + if (ifa->ifa_address) + RTA_PUT(skb, IFA_ADDRESS, 4, &ifa->ifa_address); + if (ifa->ifa_local) + RTA_PUT(skb, IFA_LOCAL, 4, &ifa->ifa_local); + if (ifa->ifa_broadcast) + RTA_PUT(skb, IFA_BROADCAST, 4, &ifa->ifa_broadcast); + if (ifa->ifa_anycast) + RTA_PUT(skb, IFA_ANYCAST, 4, &ifa->ifa_anycast); + if (ifa->ifa_label[0]) + RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label); + nlh->nlmsg_len = skb->tail - b; + return skb->len; + +nlmsg_failure: +rtattr_failure: + skb_trim(skb, b - skb->data); + return -1; +} + +static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) +{ + int idx, ip_idx; + struct net_device *dev; + struct in_device *in_dev; + struct in_ifaddr *ifa; + int s_ip_idx, s_idx = cb->args[0]; + + s_ip_idx = ip_idx = cb->args[1]; + read_lock(&dev_base_lock); + for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { + if (idx < s_idx) + continue; + if (idx > s_idx) + s_ip_idx = 0; + rcu_read_lock(); + if ((in_dev = __in_dev_get(dev)) == NULL) { + rcu_read_unlock(); + continue; + } + + for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; + ifa = ifa->ifa_next, ip_idx++) { + if (ip_idx < s_ip_idx) + continue; + if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq, + RTM_NEWADDR) <= 0) { + rcu_read_unlock(); + goto done; + } + } + rcu_read_unlock(); + } + +done: + read_unlock(&dev_base_lock); + cb->args[0] = idx; + cb->args[1] = ip_idx; + + return skb->len; +} + +static void rtmsg_ifa(int event, struct in_ifaddr* ifa) +{ + int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + 128); + struct sk_buff *skb = alloc_skb(size, GFP_KERNEL); + + if (!skb) + netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, ENOBUFS); + else if (inet_fill_ifaddr(skb, ifa, 0, 0, event) < 0) { + kfree_skb(skb); + netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, EINVAL); + } else { + NETLINK_CB(skb).dst_groups = RTMGRP_IPV4_IFADDR; + netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV4_IFADDR, GFP_KERNEL); + } +} + +static struct rtnetlink_link inet_rtnetlink_table[RTM_MAX - RTM_BASE + 1] = { + [4] = { .doit = inet_rtm_newaddr, }, + [5] = { .doit = inet_rtm_deladdr, }, + [6] = { .dumpit = inet_dump_ifaddr, }, + [8] = { .doit = inet_rtm_newroute, }, + [9] = { .doit = inet_rtm_delroute, }, + [10] = { .doit = inet_rtm_getroute, .dumpit = inet_dump_fib, }, +#ifdef CONFIG_IP_MULTIPLE_TABLES + [16] = { .doit = inet_rtm_newrule, }, + [17] = { .doit = inet_rtm_delrule, }, + [18] = { .dumpit = inet_dump_rules, }, +#endif +}; + +#ifdef CONFIG_SYSCTL + +void inet_forward_change(void) +{ + struct net_device *dev; + int on = ipv4_devconf.forwarding; + + ipv4_devconf.accept_redirects = !on; + ipv4_devconf_dflt.forwarding = on; + + read_lock(&dev_base_lock); + for (dev = dev_base; dev; dev = dev->next) { + struct in_device *in_dev; + rcu_read_lock(); + in_dev = __in_dev_get(dev); + if (in_dev) + in_dev->cnf.forwarding = on; + rcu_read_unlock(); + } + read_unlock(&dev_base_lock); + + rt_cache_flush(0); +} + +static int devinet_sysctl_forward(ctl_table *ctl, int write, + struct file* filp, void __user *buffer, + size_t *lenp, loff_t *ppos) +{ + int *valp = ctl->data; + int val = *valp; + int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); + + if (write && *valp != val) { + if (valp == &ipv4_devconf.forwarding) + inet_forward_change(); + else if (valp != &ipv4_devconf_dflt.forwarding) + rt_cache_flush(0); + } + + return ret; +} + +int ipv4_doint_and_flush(ctl_table *ctl, int write, + struct file* filp, void __user *buffer, + size_t *lenp, loff_t *ppos) +{ + int *valp = ctl->data; + int val = *valp; + int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); + + if (write && *valp != val) + rt_cache_flush(0); + + return ret; +} + +int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, + void __user *oldval, size_t __user *oldlenp, + void __user *newval, size_t newlen, + void **context) +{ + int *valp = table->data; + int new; + + if (!newval || !newlen) + return 0; + + if (newlen != sizeof(int)) + return -EINVAL; + + if (get_user(new, (int __user *)newval)) + return -EFAULT; + + if (new == *valp) + return 0; + + if (oldval && oldlenp) { + size_t len; + + if (get_user(len, oldlenp)) + return -EFAULT; + + if (len) { + if (len > table->maxlen) + len = table->maxlen; + if (copy_to_user(oldval, valp, len)) + return -EFAULT; + if (put_user(len, oldlenp)) + return -EFAULT; + } + } + + *valp = new; + rt_cache_flush(0); + return 1; +} + + +static struct devinet_sysctl_table { + struct ctl_table_header *sysctl_header; + ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; + ctl_table devinet_dev[2]; + ctl_table devinet_conf_dir[2]; + ctl_table devinet_proto_dir[2]; + ctl_table devinet_root_dir[2]; +} devinet_sysctl = { + .devinet_vars = { + { + .ctl_name = NET_IPV4_CONF_FORWARDING, + .procname = "forwarding", + .data = &ipv4_devconf.forwarding, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &devinet_sysctl_forward, + }, + { + .ctl_name = NET_IPV4_CONF_MC_FORWARDING, + .procname = "mc_forwarding", + .data = &ipv4_devconf.mc_forwarding, + .maxlen = sizeof(int), + .mode = 0444, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS, + .procname = "accept_redirects", + .data = &ipv4_devconf.accept_redirects, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS, + .procname = "secure_redirects", + .data = &ipv4_devconf.secure_redirects, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_SHARED_MEDIA, + .procname = "shared_media", + .data = &ipv4_devconf.shared_media, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_RP_FILTER, + .procname = "rp_filter", + .data = &ipv4_devconf.rp_filter, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS, + .procname = "send_redirects", + .data = &ipv4_devconf.send_redirects, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, + .procname = "accept_source_route", + .data = &ipv4_devconf.accept_source_route, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_PROXY_ARP, + .procname = "proxy_arp", + .data = &ipv4_devconf.proxy_arp, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_MEDIUM_ID, + .procname = "medium_id", + .data = &ipv4_devconf.medium_id, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_BOOTP_RELAY, + .procname = "bootp_relay", + .data = &ipv4_devconf.bootp_relay, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_LOG_MARTIANS, + .procname = "log_martians", + .data = &ipv4_devconf.log_martians, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_TAG, + .procname = "tag", + .data = &ipv4_devconf.tag, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_ARPFILTER, + .procname = "arp_filter", + .data = &ipv4_devconf.arp_filter, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE, + .procname = "arp_announce", + .data = &ipv4_devconf.arp_announce, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_ARP_IGNORE, + .procname = "arp_ignore", + .data = &ipv4_devconf.arp_ignore, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, + { + .ctl_name = NET_IPV4_CONF_NOXFRM, + .procname = "disable_xfrm", + .data = &ipv4_devconf.no_xfrm, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &ipv4_doint_and_flush, + .strategy = &ipv4_doint_and_flush_strategy, + }, + { + .ctl_name = NET_IPV4_CONF_NOPOLICY, + .procname = "disable_policy", + .data = &ipv4_devconf.no_policy, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &ipv4_doint_and_flush, + .strategy = &ipv4_doint_and_flush_strategy, + }, + { + .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION, + .procname = "force_igmp_version", + .data = &ipv4_devconf.force_igmp_version, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &ipv4_doint_and_flush, + .strategy = &ipv4_doint_and_flush_strategy, + }, + }, + .devinet_dev = { + { + .ctl_name = NET_PROTO_CONF_ALL, + .procname = "all", + .mode = 0555, + .child = devinet_sysctl.devinet_vars, + }, + }, + .devinet_conf_dir = { + { + .ctl_name = NET_IPV4_CONF, + .procname = "conf", + .mode = 0555, + .child = devinet_sysctl.devinet_dev, + }, + }, + .devinet_proto_dir = { + { + .ctl_name = NET_IPV4, + .procname = "ipv4", + .mode = 0555, + .child = devinet_sysctl.devinet_conf_dir, + }, + }, + .devinet_root_dir = { + { + .ctl_name = CTL_NET, + .procname = "net", + .mode = 0555, + .child = devinet_sysctl.devinet_proto_dir, + }, + }, +}; + +static void devinet_sysctl_register(struct in_device *in_dev, + struct ipv4_devconf *p) +{ + int i; + struct net_device *dev = in_dev ? in_dev->dev : NULL; + struct devinet_sysctl_table *t = kmalloc(sizeof(*t), GFP_KERNEL); + char *dev_name = NULL; + + if (!t) + return; + memcpy(t, &devinet_sysctl, sizeof(*t)); + for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { + t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; + t->devinet_vars[i].de = NULL; + } + + if (dev) { + dev_name = dev->name; + t->devinet_dev[0].ctl_name = dev->ifindex; + } else { + dev_name = "default"; + t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; + } + + /* + * Make a copy of dev_name, because '.procname' is regarded as const + * by sysctl and we wouldn't want anyone to change it under our feet + * (see SIOCSIFNAME). + */ + dev_name = net_sysctl_strdup(dev_name); + if (!dev_name) + goto free; + + t->devinet_dev[0].procname = dev_name; + t->devinet_dev[0].child = t->devinet_vars; + t->devinet_dev[0].de = NULL; + t->devinet_conf_dir[0].child = t->devinet_dev; + t->devinet_conf_dir[0].de = NULL; + t->devinet_proto_dir[0].child = t->devinet_conf_dir; + t->devinet_proto_dir[0].de = NULL; + t->devinet_root_dir[0].child = t->devinet_proto_dir; + t->devinet_root_dir[0].de = NULL; + + t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0); + if (!t->sysctl_header) + goto free_procname; + + p->sysctl = t; + return; + + /* error path */ + free_procname: + kfree(dev_name); + free: + kfree(t); + return; +} + +static void devinet_sysctl_unregister(struct ipv4_devconf *p) +{ + if (p->sysctl) { + struct devinet_sysctl_table *t = p->sysctl; + p->sysctl = NULL; + unregister_sysctl_table(t->sysctl_header); + kfree(t->devinet_dev[0].procname); + kfree(t); + } +} +#endif + +void __init devinet_init(void) +{ + register_gifconf(PF_INET, inet_gifconf); + register_netdevice_notifier(&ip_netdev_notifier); + rtnetlink_links[PF_INET] = inet_rtnetlink_table; +#ifdef CONFIG_SYSCTL + devinet_sysctl.sysctl_header = + register_sysctl_table(devinet_sysctl.devinet_root_dir, 0); + devinet_sysctl_register(NULL, &ipv4_devconf_dflt); +#endif +} + +EXPORT_SYMBOL(devinet_ioctl); +EXPORT_SYMBOL(in_dev_finish_destroy); +EXPORT_SYMBOL(inet_select_addr); +EXPORT_SYMBOL(inetdev_by_index); +EXPORT_SYMBOL(register_inetaddr_notifier); +EXPORT_SYMBOL(unregister_inetaddr_notifier); -- cgit v1.1