diff options
Diffstat (limited to 'pfinet/linux-src/net/ipv4/devinet.c')
| -rw-r--r-- | pfinet/linux-src/net/ipv4/devinet.c | 1034 |
1 files changed, 1034 insertions, 0 deletions
diff --git a/pfinet/linux-src/net/ipv4/devinet.c b/pfinet/linux-src/net/ipv4/devinet.c new file mode 100644 index 00000000..a50ee3bd --- /dev/null +++ b/pfinet/linux-src/net/ipv4/devinet.c @@ -0,0 +1,1034 @@ +/* + * NET3 IP device support routines. + * + * Version: $Id: devinet.c,v 1.28.2.2 1999/08/07 10:56:18 davem Exp $ + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Derived from the IP parts of dev.c 1.0.19 + * Authors: Ross Biro, <bir7@leland.Stanford.Edu> + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * Mark Evans, <evansmp@uhura.aston.ac.uk> + * + * Additional Authors: + * Alan Cox, <gw4pts@gw4pts.ampr.org> + * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + * + * Changes: + * Alexey Kuznetsov: pa_* fields are replaced with ifaddr lists. + * Cyrus Durgin: updated for kmod + */ + +#include <linux/config.h> + +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/bitops.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/in.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/if_ether.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/rtnetlink.h> +#include <linux/init.h> +#include <linux/notifier.h> +#include <linux/inetdevice.h> +#include <linux/igmp.h> +#ifdef CONFIG_SYSCTL +#include <linux/sysctl.h> +#endif +#ifdef CONFIG_KMOD +#include <linux/kmod.h> +#endif + +#include <net/ip.h> +#include <net/route.h> +#include <net/ip_fib.h> + +struct ipv4_devconf ipv4_devconf = { 1, 1, 1, 1, 0, }; +static struct ipv4_devconf ipv4_devconf_dflt = { 1, 1, 1, 1, 1, }; + +#ifdef CONFIG_RTNETLINK +static void rtmsg_ifa(int event, struct in_ifaddr *); +#else +#define rtmsg_ifa(a,b) do { } while(0) +#endif + +static struct notifier_block *inetaddr_chain; +static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, int destroy); +#ifdef CONFIG_SYSCTL +static void devinet_sysctl_register(struct in_device *in_dev, struct ipv4_devconf *p); +static void devinet_sysctl_unregister(struct ipv4_devconf *p); +#endif + +int inet_ifa_count; +int inet_dev_count; + +static struct in_ifaddr * inet_alloc_ifa(void) +{ + struct in_ifaddr *ifa; + + ifa = kmalloc(sizeof(*ifa), GFP_KERNEL); + if (ifa) { + memset(ifa, 0, sizeof(*ifa)); + inet_ifa_count++; + } + + return ifa; +} + +static __inline__ void inet_free_ifa(struct in_ifaddr *ifa) +{ + kfree_s(ifa, sizeof(*ifa)); + inet_ifa_count--; +} + +struct in_device *inetdev_init(struct device *dev) +{ + struct in_device *in_dev; + + if (dev->mtu < 68) + return NULL; + + in_dev = kmalloc(sizeof(*in_dev), GFP_KERNEL); + if (!in_dev) + return NULL; + inet_dev_count++; + memset(in_dev, 0, sizeof(*in_dev)); + memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); + in_dev->cnf.sysctl = NULL; + in_dev->dev = dev; + if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) { + kfree(in_dev); + return NULL; + } +#ifdef CONFIG_SYSCTL + neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, NET_IPV4_NEIGH, "ipv4"); +#endif + dev->ip_ptr = in_dev; +#ifdef CONFIG_SYSCTL + devinet_sysctl_register(in_dev, &in_dev->cnf); +#endif + if (dev->flags&IFF_UP) + ip_mc_up(in_dev); + return in_dev; +} + +static void inetdev_destroy(struct in_device *in_dev) +{ + struct in_ifaddr *ifa; + + 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 + in_dev->dev->ip_ptr = NULL; + synchronize_bh(); + neigh_parms_release(&arp_tbl, in_dev->arp_parms); + kfree(in_dev); +} + +struct in_ifaddr * inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b) +{ + for_primary_ifa(in_dev) { + if (inet_ifa_match(a, ifa)) { + if (!b || inet_ifa_match(b, ifa)) + return ifa; + } + } endfor_ifa(in_dev); + return NULL; +} + +static void +inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, int destroy) +{ + struct in_ifaddr *ifa1 = *ifap; + + /* 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; + synchronize_bh(); + + rtmsg_ifa(RTM_DELADDR, ifa); + notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa); + inet_free_ifa(ifa); + } + } + + /* 2. Unlink it */ + + *ifap = ifa1->ifa_next; + synchronize_bh(); + + /* 3. Announce address deletion */ + + /* Send message first, then call notifier. + At first sight, FIB update triggered by notifier + will refer to already deleted ifaddr, that could confuse + netlink listeners. It is not true: look, gated sees + that route deleted and if it still thinks that ifaddr + is valid, it will try to restore deleted routes... Grr. + So that, this order is correct. + */ + rtmsg_ifa(RTM_DELADDR, ifa1); + notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); + if (destroy) { + inet_free_ifa(ifa1); + if (in_dev->ifa_list == NULL) + inetdev_destroy(in_dev); + } +} + +static int +inet_insert_ifa(struct in_device *in_dev, struct in_ifaddr *ifa) +{ + struct in_ifaddr *ifa1, **ifap, **last_primary; + + if (ifa->ifa_local == 0) { + inet_free_ifa(ifa); + return 0; + } + + ifa->ifa_flags &= ~IFA_F_SECONDARY; + last_primary = &in_dev->ifa_list; + + for (ifap=&in_dev->ifa_list; (ifa1=*ifap)!=NULL; ifap=&ifa1->ifa_next) { + if (!(ifa1->ifa_flags&IFA_F_SECONDARY) && ifa->ifa_scope <= ifa1->ifa_scope) + last_primary = &ifa1->ifa_next; + if (ifa1->ifa_mask == ifa->ifa_mask && inet_ifa_match(ifa1->ifa_address, ifa)) { + if (ifa1->ifa_local == ifa->ifa_local) { + inet_free_ifa(ifa); + return -EEXIST; + } + if (ifa1->ifa_scope != ifa->ifa_scope) { + inet_free_ifa(ifa); + return -EINVAL; + } + ifa->ifa_flags |= IFA_F_SECONDARY; + } + } + + if (!(ifa->ifa_flags&IFA_F_SECONDARY)) { + net_srandom(ifa->ifa_local); + ifap = last_primary; + } + + ifa->ifa_next = *ifap; + wmb(); + *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 device *dev, struct in_ifaddr *ifa) +{ + struct in_device *in_dev = dev->ip_ptr; + + if (in_dev == NULL) { + in_dev = inetdev_init(dev); + if (in_dev == NULL) { + inet_free_ifa(ifa); + return -ENOBUFS; + } + } + ifa->ifa_dev = in_dev; + if (LOOPBACK(ifa->ifa_local)) + ifa->ifa_scope = RT_SCOPE_HOST; + return inet_insert_ifa(in_dev, ifa); +} + +struct in_device *inetdev_by_index(int ifindex) +{ + struct device *dev; + dev = dev_get_by_index(ifindex); + if (dev) + return dev->ip_ptr; + return NULL; +} + +struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask) +{ + for_primary_ifa(in_dev) { + if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) + return ifa; + } endfor_ifa(in_dev); + return NULL; +} + +#ifdef CONFIG_RTNETLINK + +/* rtm_{add|del} functions are not reenterable, so that + this structure can be made 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; + + if ((in_dev = inetdev_by_index(ifm->ifa_index)) == NULL) + return -EADDRNOTAVAIL; + + for (ifap=&in_dev->ifa_list; (ifa=*ifap)!=NULL; ifap=&ifa->ifa_next) { + if ((rta[IFA_LOCAL-1] && memcmp(RTA_DATA(rta[IFA_LOCAL-1]), &ifa->ifa_local, 4)) || + (rta[IFA_LABEL-1] && strcmp(RTA_DATA(rta[IFA_LABEL-1]), ifa->ifa_label)) || + (rta[IFA_ADDRESS-1] && + (ifm->ifa_prefixlen != ifa->ifa_prefixlen || + !inet_ifa_match(*(u32*)RTA_DATA(rta[IFA_ADDRESS-1]), ifa)))) + continue; + inet_del_ifa(in_dev, ifap, 1); + return 0; + } + + return -EADDRNOTAVAIL; +} + +int +inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) +{ + struct rtattr **rta = arg; + struct device *dev; + struct in_device *in_dev; + struct ifaddrmsg *ifm = NLMSG_DATA(nlh); + struct in_ifaddr *ifa; + + if (ifm->ifa_prefixlen > 32 || rta[IFA_LOCAL-1] == NULL) + return -EINVAL; + + if ((dev = dev_get_by_index(ifm->ifa_index)) == NULL) + return -ENODEV; + + if ((in_dev = dev->ip_ptr) == NULL) { + in_dev = inetdev_init(dev); + if (!in_dev) + return -ENOBUFS; + } + + if ((ifa = inet_alloc_ifa()) == NULL) + return -ENOBUFS; + + if (rta[IFA_ADDRESS-1] == NULL) + rta[IFA_ADDRESS-1] = rta[IFA_LOCAL-1]; + memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 4); + memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 4); + ifa->ifa_prefixlen = ifm->ifa_prefixlen; + ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); + if (rta[IFA_BROADCAST-1]) + memcpy(&ifa->ifa_broadcast, RTA_DATA(rta[IFA_BROADCAST-1]), 4); + if (rta[IFA_ANYCAST-1]) + memcpy(&ifa->ifa_anycast, RTA_DATA(rta[IFA_ANYCAST-1]), 4); + ifa->ifa_flags = ifm->ifa_flags; + ifa->ifa_scope = ifm->ifa_scope; + ifa->ifa_dev = in_dev; + if (rta[IFA_LABEL-1]) + memcpy(ifa->ifa_label, RTA_DATA(rta[IFA_LABEL-1]), IFNAMSIZ); + else + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + + return inet_insert_ifa(in_dev, ifa); +} + +#endif + +/* + * Determine a default network mask, based on the IP address. + */ + +static __inline__ int inet_abc_len(u32 addr) +{ + if (ZERONET(addr)) + return 0; + + addr = ntohl(addr); + if (IN_CLASSA(addr)) + return 8; + if (IN_CLASSB(addr)) + return 16; + if (IN_CLASSC(addr)) + return 24; + + /* + * Something else, probably a multicast. + */ + + return -1; +} + + +int devinet_ioctl(unsigned int cmd, void *arg) +{ + struct ifreq ifr; + struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; + struct in_device *in_dev; + struct in_ifaddr **ifap = NULL; + struct in_ifaddr *ifa = NULL; + struct device *dev; +#ifdef CONFIG_IP_ALIAS + char *colon; +#endif + int exclusive = 0; + int ret = 0; + + /* + * Fetch the caller's info block into kernel space + */ + + if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) + return -EFAULT; + ifr.ifr_name[IFNAMSIZ-1] = 0; + +#ifdef CONFIG_IP_ALIAS + colon = strchr(ifr.ifr_name, ':'); + if (colon) + *colon = 0; +#endif + +#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 this ioctls will not sleep, + so that we do not impose a lock. + One day we will be forced to put shlock here (I mean SMP) + */ + memset(sin, 0, sizeof(*sin)); + sin->sin_family = AF_INET; + break; + + case SIOCSIFFLAGS: + if (!capable(CAP_NET_ADMIN)) + return -EACCES; + rtnl_lock(); + exclusive = 1; + break; + case SIOCSIFADDR: /* Set interface address (and family) */ + case SIOCSIFBRDADDR: /* Set the broadcast address */ + case SIOCSIFDSTADDR: /* Set the destination address */ + case SIOCSIFNETMASK: /* Set the netmask for the interface */ + if (!capable(CAP_NET_ADMIN)) + return -EACCES; + if (sin->sin_family != AF_INET) + return -EINVAL; + rtnl_lock(); + exclusive = 1; + break; + default: + return -EINVAL; + } + + + if ((dev = dev_get(ifr.ifr_name)) == NULL) { + ret = -ENODEV; + goto done; + } + +#ifdef CONFIG_IP_ALIAS + if (colon) + *colon = ':'; +#endif + + if ((in_dev=dev->ip_ptr) != NULL) { + for (ifap=&in_dev->ifa_list; (ifa=*ifap) != NULL; ifap=&ifa->ifa_next) + if (strcmp(ifr.ifr_name, ifa->ifa_label) == 0) + break; + } + + if (ifa == NULL && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) { + ret = -EADDRNOTAVAIL; + goto done; + } + + switch(cmd) { + case SIOCGIFADDR: /* Get interface address */ + sin->sin_addr.s_addr = ifa->ifa_local; + goto rarok; + + case SIOCGIFBRDADDR: /* Get the broadcast address */ + sin->sin_addr.s_addr = ifa->ifa_broadcast; + goto rarok; + + case SIOCGIFDSTADDR: /* Get the destination address */ + sin->sin_addr.s_addr = ifa->ifa_address; + goto rarok; + + case SIOCGIFNETMASK: /* Get the netmask for the interface */ + sin->sin_addr.s_addr = ifa->ifa_mask; + goto rarok; + + case SIOCSIFFLAGS: +#ifdef CONFIG_IP_ALIAS + if (colon) { + if (ifa == NULL) { + ret = -EADDRNOTAVAIL; + break; + } + if (!(ifr.ifr_flags&IFF_UP)) + inet_del_ifa(in_dev, ifap, 1); + break; + } +#endif + ret = dev_change_flags(dev, ifr.ifr_flags); + break; + + case SIOCSIFADDR: /* Set interface address (and family) */ + if (inet_abc_len(sin->sin_addr.s_addr) < 0) { + ret = -EINVAL; + break; + } + + if (!ifa) { + if ((ifa = inet_alloc_ifa()) == NULL) { + ret = -ENOBUFS; + break; + } +#ifdef CONFIG_IP_ALIAS + if (colon) + memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); + else +#endif + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + } else { + ret = 0; + if (ifa->ifa_local == sin->sin_addr.s_addr) + break; + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_broadcast = 0; + ifa->ifa_anycast = 0; + } + + ifa->ifa_address = + ifa->ifa_local = sin->sin_addr.s_addr; + + if (!(dev->flags&IFF_POINTOPOINT)) { + ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); + ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); + if ((dev->flags&IFF_BROADCAST) && ifa->ifa_prefixlen < 31) + ifa->ifa_broadcast = ifa->ifa_address|~ifa->ifa_mask; + } else { + ifa->ifa_prefixlen = 32; + ifa->ifa_mask = inet_make_mask(32); + } + ret = inet_set_ifa(dev, ifa); + break; + + case SIOCSIFBRDADDR: /* Set the broadcast address */ + if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_broadcast = sin->sin_addr.s_addr; + inet_insert_ifa(in_dev, ifa); + } + break; + + case SIOCSIFDSTADDR: /* Set the destination address */ + if (ifa->ifa_address != sin->sin_addr.s_addr) { + if (inet_abc_len(sin->sin_addr.s_addr) < 0) { + ret = -EINVAL; + break; + } + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_address = sin->sin_addr.s_addr; + inet_insert_ifa(in_dev, ifa); + } + break; + + case SIOCSIFNETMASK: /* Set the netmask for the interface */ + + /* + * The mask we set must be legal. + */ + if (bad_mask(sin->sin_addr.s_addr, 0)) { + ret = -EINVAL; + break; + } + + if (ifa->ifa_mask != sin->sin_addr.s_addr) { + inet_del_ifa(in_dev, ifap, 0); + ifa->ifa_mask = sin->sin_addr.s_addr; + ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); + inet_set_ifa(dev, ifa); + } + break; + } +done: + if (exclusive) + rtnl_unlock(); + return ret; + +rarok: + if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) + return -EFAULT; + return 0; +} + +static int +inet_gifconf(struct device *dev, char *buf, int len) +{ + struct in_device *in_dev = dev->ip_ptr; + struct in_ifaddr *ifa; + struct ifreq ifr; + int done=0; + + if (in_dev==NULL || (ifa=in_dev->ifa_list)==NULL) + return 0; + + for ( ; ifa; ifa = ifa->ifa_next) { + if (!buf) { + done += sizeof(ifr); + continue; + } + if (len < (int) sizeof(ifr)) + return done; + memset(&ifr, 0, sizeof(struct ifreq)); + if (ifa->ifa_label) + strcpy(ifr.ifr_name, ifa->ifa_label); + else + strcpy(ifr.ifr_name, dev->name); + + (*(struct sockaddr_in *) &ifr.ifr_addr).sin_family = AF_INET; + (*(struct sockaddr_in *) &ifr.ifr_addr).sin_addr.s_addr = ifa->ifa_local; + + if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) + return -EFAULT; + buf += sizeof(struct ifreq); + len -= sizeof(struct ifreq); + done += sizeof(struct ifreq); + } + return done; +} + +u32 inet_select_addr(struct device *dev, u32 dst, int scope) +{ + u32 addr = 0; + struct in_device *in_dev = dev->ip_ptr; + + if (in_dev == NULL) + return 0; + + for_primary_ifa(in_dev) { + if (ifa->ifa_scope > scope) + continue; + if (!dst || inet_ifa_match(dst, ifa)) + return ifa->ifa_local; + if (!addr) + addr = ifa->ifa_local; + } endfor_ifa(in_dev); + + if (addr || scope >= RT_SCOPE_LINK) + return addr; + + /* Not loopback addresses on loopback should be preferred + in this case. It is importnat that lo is the first interface + in dev_base list. + */ + for (dev=dev_base; dev; dev=dev->next) { + if ((in_dev=dev->ip_ptr) == NULL) + continue; + + for_primary_ifa(in_dev) { + if (ifa->ifa_scope <= scope) + return ifa->ifa_local; + } endfor_ifa(in_dev); + } + + return 0; +} + +/* + * Device notifier + */ + +int register_inetaddr_notifier(struct notifier_block *nb) +{ + return notifier_chain_register(&inetaddr_chain, nb); +} + +int unregister_inetaddr_notifier(struct notifier_block *nb) +{ + return notifier_chain_unregister(&inetaddr_chain,nb); +} + +static int inetdev_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + struct device *dev = ptr; + struct in_device *in_dev = dev->ip_ptr; + + if (in_dev == NULL) + return NOTIFY_DONE; + + switch (event) { + case NETDEV_REGISTER: + if (in_dev) + printk(KERN_DEBUG "inetdev_event: bug\n"); + dev->ip_ptr = NULL; + break; + case NETDEV_UP: + 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); + ifa->ifa_dev = in_dev; + ifa->ifa_scope = RT_SCOPE_HOST; + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + inet_insert_ifa(in_dev, 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 minimal IP mtu. Disable IP. */ + case NETDEV_UNREGISTER: + inetdev_destroy(in_dev); + break; + case NETDEV_CHANGENAME: + if (in_dev->ifa_list) { + struct in_ifaddr *ifa; + for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) + memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); + /* Do not notify about label change, this event is + not interesting to applications using netlink. + */ + } + break; + } + + return NOTIFY_DONE; +} + +struct notifier_block ip_netdev_notifier={ + inetdev_event, + NULL, + 0 +}; + +#ifdef CONFIG_RTNETLINK + +static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, + u32 pid, u32 seq, int event) +{ + struct ifaddrmsg *ifm; + struct nlmsghdr *nlh; + unsigned char *b = skb->tail; + + nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm)); + ifm = NLMSG_DATA(nlh); + ifm->ifa_family = AF_INET; + ifm->ifa_prefixlen = ifa->ifa_prefixlen; + ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; + ifm->ifa_scope = ifa->ifa_scope; + ifm->ifa_index = ifa->ifa_dev->dev->ifindex; + if (ifa->ifa_address) + RTA_PUT(skb, IFA_ADDRESS, 4, &ifa->ifa_address); + if (ifa->ifa_local) + RTA_PUT(skb, IFA_LOCAL, 4, &ifa->ifa_local); + if (ifa->ifa_broadcast) + RTA_PUT(skb, IFA_BROADCAST, 4, &ifa->ifa_broadcast); + if (ifa->ifa_anycast) + RTA_PUT(skb, IFA_ANYCAST, 4, &ifa->ifa_anycast); + if (ifa->ifa_label[0]) + RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label); + nlh->nlmsg_len = skb->tail - b; + return skb->len; + +nlmsg_failure: +rtattr_failure: + skb_trim(skb, b - skb->data); + return -1; +} + +static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) +{ + int idx, ip_idx; + int s_idx, s_ip_idx; + struct device *dev; + struct in_device *in_dev; + struct in_ifaddr *ifa; + + s_idx = cb->args[0]; + s_ip_idx = ip_idx = cb->args[1]; + for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { + if (idx < s_idx) + continue; + if (idx > s_idx) + s_ip_idx = 0; + if ((in_dev = dev->ip_ptr) == NULL) + 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) + goto done; + } + } +done: + cb->args[0] = idx; + cb->args[1] = ip_idx; + + return skb->len; +} + +static void rtmsg_ifa(int event, struct in_ifaddr * ifa) +{ + struct sk_buff *skb; + int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128); + + skb = alloc_skb(size, GFP_KERNEL); + if (!skb) { + netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, ENOBUFS); + return; + } + if (inet_fill_ifaddr(skb, ifa, 0, 0, event) < 0) { + kfree_skb(skb); + netlink_set_err(rtnl, 0, RTMGRP_IPV4_IFADDR, EINVAL); + return; + } + NETLINK_CB(skb).dst_groups = RTMGRP_IPV4_IFADDR; + netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV4_IFADDR, GFP_KERNEL); +} + + +static struct rtnetlink_link inet_rtnetlink_table[RTM_MAX-RTM_BASE+1] = +{ + { NULL, NULL, }, + { NULL, NULL, }, + { NULL, NULL, }, + { NULL, NULL, }, + + { inet_rtm_newaddr, NULL, }, + { inet_rtm_deladdr, NULL, }, + { NULL, inet_dump_ifaddr, }, + { NULL, NULL, }, + + { inet_rtm_newroute, NULL, }, + { inet_rtm_delroute, NULL, }, + { inet_rtm_getroute, inet_dump_fib, }, + { NULL, NULL, }, + + { NULL, NULL, }, + { NULL, NULL, }, + { NULL, NULL, }, + { NULL, NULL, }, + +#ifdef CONFIG_IP_MULTIPLE_TABLES + { inet_rtm_newrule, NULL, }, + { inet_rtm_delrule, NULL, }, + { NULL, inet_dump_rules, }, + { NULL, NULL, }, +#else + { NULL, NULL, }, + { NULL, NULL, }, + { NULL, NULL, }, + { NULL, NULL, }, +#endif +}; + +#endif /* CONFIG_RTNETLINK */ + + +#ifdef CONFIG_SYSCTL + +void inet_forward_change() +{ + struct device *dev; + int on = ipv4_devconf.forwarding; + + ipv4_devconf.accept_redirects = !on; + ipv4_devconf_dflt.forwarding = on; + + for (dev = dev_base; dev; dev = dev->next) { + struct in_device *in_dev = dev->ip_ptr; + if (in_dev) + in_dev->cnf.forwarding = on; + } + + rt_cache_flush(0); + + ip_statistics.IpForwarding = on ? 1 : 2; +} + +static +int devinet_sysctl_forward(ctl_table *ctl, int write, struct file * filp, + void *buffer, size_t *lenp) +{ + int *valp = ctl->data; + int val = *valp; + int ret; + + ret = proc_dointvec(ctl, write, filp, buffer, lenp); + + if (write && *valp != val) { + if (valp == &ipv4_devconf.forwarding) + inet_forward_change(); + else if (valp != &ipv4_devconf_dflt.forwarding) + rt_cache_flush(0); + } + + return ret; +} + +static struct devinet_sysctl_table +{ + struct ctl_table_header *sysctl_header; + ctl_table devinet_vars[12]; + ctl_table devinet_dev[2]; + ctl_table devinet_conf_dir[2]; + ctl_table devinet_proto_dir[2]; + ctl_table devinet_root_dir[2]; +} devinet_sysctl = { + NULL, + {{NET_IPV4_CONF_FORWARDING, "forwarding", + &ipv4_devconf.forwarding, sizeof(int), 0644, NULL, + &devinet_sysctl_forward}, + {NET_IPV4_CONF_MC_FORWARDING, "mc_forwarding", + &ipv4_devconf.mc_forwarding, sizeof(int), 0444, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_ACCEPT_REDIRECTS, "accept_redirects", + &ipv4_devconf.accept_redirects, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_SECURE_REDIRECTS, "secure_redirects", + &ipv4_devconf.secure_redirects, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_SHARED_MEDIA, "shared_media", + &ipv4_devconf.shared_media, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_RP_FILTER, "rp_filter", + &ipv4_devconf.rp_filter, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_SEND_REDIRECTS, "send_redirects", + &ipv4_devconf.send_redirects, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, "accept_source_route", + &ipv4_devconf.accept_source_route, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_PROXY_ARP, "proxy_arp", + &ipv4_devconf.proxy_arp, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_BOOTP_RELAY, "bootp_relay", + &ipv4_devconf.bootp_relay, sizeof(int), 0644, NULL, + &proc_dointvec}, + {NET_IPV4_CONF_LOG_MARTIANS, "log_martians", + &ipv4_devconf.log_martians, sizeof(int), 0644, NULL, + &proc_dointvec}, + {0}}, + + {{NET_PROTO_CONF_ALL, "all", NULL, 0, 0555, devinet_sysctl.devinet_vars},{0}}, + {{NET_IPV4_CONF, "conf", NULL, 0, 0555, devinet_sysctl.devinet_dev},{0}}, + {{NET_IPV4, "ipv4", NULL, 0, 0555, devinet_sysctl.devinet_conf_dir},{0}}, + {{CTL_NET, "net", NULL, 0, 0555, devinet_sysctl.devinet_proto_dir},{0}} +}; + +static void devinet_sysctl_register(struct in_device *in_dev, struct ipv4_devconf *p) +{ + int i; + struct device *dev = in_dev ? in_dev->dev : NULL; + struct devinet_sysctl_table *t; + + t = kmalloc(sizeof(*t), GFP_KERNEL); + if (t == NULL) + return; + memcpy(t, &devinet_sysctl, sizeof(*t)); + for (i=0; i<sizeof(t->devinet_vars)/sizeof(t->devinet_vars[0])-1; i++) { + t->devinet_vars[i].data += (char*)p - (char*)&ipv4_devconf; + t->devinet_vars[i].de = NULL; + } + if (dev) { + t->devinet_dev[0].procname = dev->name; + t->devinet_dev[0].ctl_name = dev->ifindex; + } else { + t->devinet_dev[0].procname = "default"; + t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; + } + t->devinet_dev[0].child = t->devinet_vars; + t->devinet_dev[0].de = NULL; + t->devinet_conf_dir[0].child = t->devinet_dev; + t->devinet_conf_dir[0].de = NULL; + t->devinet_proto_dir[0].child = t->devinet_conf_dir; + t->devinet_proto_dir[0].de = NULL; + t->devinet_root_dir[0].child = t->devinet_proto_dir; + t->devinet_root_dir[0].de = NULL; + + t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0); + if (t->sysctl_header == NULL) + kfree(t); + else + p->sysctl = t; +} + +static void devinet_sysctl_unregister(struct ipv4_devconf *p) +{ + if (p->sysctl) { + struct devinet_sysctl_table *t = p->sysctl; + p->sysctl = NULL; + unregister_sysctl_table(t->sysctl_header); + kfree(t); + } +} +#endif + +__initfunc(void devinet_init(void)) +{ + register_gifconf(PF_INET, inet_gifconf); + register_netdevice_notifier(&ip_netdev_notifier); +#ifdef CONFIG_RTNETLINK + rtnetlink_links[PF_INET] = inet_rtnetlink_table; +#endif +#ifdef CONFIG_SYSCTL + devinet_sysctl.sysctl_header = + register_sysctl_table(devinet_sysctl.devinet_root_dir, 0); + devinet_sysctl_register(NULL, &ipv4_devconf_dflt); +#endif +} |