/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Routing netlink socket interface: protocol independent part. * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * 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. * * Fixes: * Vitaly E. Lavrov RTA_OK arithmetics was wrong. */ #include <linux/errno.h> #include <linux/module.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/kernel.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/capability.h> #include <linux/skbuff.h> #include <linux/init.h> #include <linux/security.h> #include <linux/mutex.h> #include <linux/if_addr.h> #include <linux/nsproxy.h> #include <asm/uaccess.h> #include <asm/system.h> #include <asm/string.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <net/ip.h> #include <net/protocol.h> #include <net/arp.h> #include <net/route.h> #include <net/udp.h> #include <net/sock.h> #include <net/pkt_sched.h> #include <net/fib_rules.h> #include <net/rtnetlink.h> struct rtnl_link { rtnl_doit_func doit; rtnl_dumpit_func dumpit; }; static DEFINE_MUTEX(rtnl_mutex); void rtnl_lock(void) { mutex_lock(&rtnl_mutex); } void __rtnl_unlock(void) { mutex_unlock(&rtnl_mutex); } void rtnl_unlock(void) { /* This fellow will unlock it for us. */ netdev_run_todo(); } int rtnl_trylock(void) { return mutex_trylock(&rtnl_mutex); } int rtnl_is_locked(void) { return mutex_is_locked(&rtnl_mutex); } static struct rtnl_link *rtnl_msg_handlers[NPROTO]; static inline int rtm_msgindex(int msgtype) { int msgindex = msgtype - RTM_BASE; /* * msgindex < 0 implies someone tried to register a netlink * control code. msgindex >= RTM_NR_MSGTYPES may indicate that * the message type has not been added to linux/rtnetlink.h */ BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); return msgindex; } static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) { struct rtnl_link *tab; tab = rtnl_msg_handlers[protocol]; if (tab == NULL || tab[msgindex].doit == NULL) tab = rtnl_msg_handlers[PF_UNSPEC]; return tab ? tab[msgindex].doit : NULL; } static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) { struct rtnl_link *tab; tab = rtnl_msg_handlers[protocol]; if (tab == NULL || tab[msgindex].dumpit == NULL) tab = rtnl_msg_handlers[PF_UNSPEC]; return tab ? tab[msgindex].dumpit : NULL; } /** * __rtnl_register - Register a rtnetlink message type * @protocol: Protocol family or PF_UNSPEC * @msgtype: rtnetlink message type * @doit: Function pointer called for each request message * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message * * Registers the specified function pointers (at least one of them has * to be non-NULL) to be called whenever a request message for the * specified protocol family and message type is received. * * The special protocol family PF_UNSPEC may be used to define fallback * function pointers for the case when no entry for the specific protocol * family exists. * * Returns 0 on success or a negative error code. */ int __rtnl_register(int protocol, int msgtype, rtnl_doit_func doit, rtnl_dumpit_func dumpit) { struct rtnl_link *tab; int msgindex; BUG_ON(protocol < 0 || protocol >= NPROTO); msgindex = rtm_msgindex(msgtype); tab = rtnl_msg_handlers[protocol]; if (tab == NULL) { tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); if (tab == NULL) return -ENOBUFS; rtnl_msg_handlers[protocol] = tab; } if (doit) tab[msgindex].doit = doit; if (dumpit) tab[msgindex].dumpit = dumpit; return 0; } EXPORT_SYMBOL_GPL(__rtnl_register); /** * rtnl_register - Register a rtnetlink message type * * Identical to __rtnl_register() but panics on failure. This is useful * as failure of this function is very unlikely, it can only happen due * to lack of memory when allocating the chain to store all message * handlers for a protocol. Meant for use in init functions where lack * of memory implies no sense in continueing. */ void rtnl_register(int protocol, int msgtype, rtnl_doit_func doit, rtnl_dumpit_func dumpit) { if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) panic("Unable to register rtnetlink message handler, " "protocol = %d, message type = %d\n", protocol, msgtype); } EXPORT_SYMBOL_GPL(rtnl_register); /** * rtnl_unregister - Unregister a rtnetlink message type * @protocol: Protocol family or PF_UNSPEC * @msgtype: rtnetlink message type * * Returns 0 on success or a negative error code. */ int rtnl_unregister(int protocol, int msgtype) { int msgindex; BUG_ON(protocol < 0 || protocol >= NPROTO); msgindex = rtm_msgindex(msgtype); if (rtnl_msg_handlers[protocol] == NULL) return -ENOENT; rtnl_msg_handlers[protocol][msgindex].doit = NULL; rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; return 0; } EXPORT_SYMBOL_GPL(rtnl_unregister); /** * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol * @protocol : Protocol family or PF_UNSPEC * * Identical to calling rtnl_unregster() for all registered message types * of a certain protocol family. */ void rtnl_unregister_all(int protocol) { BUG_ON(protocol < 0 || protocol >= NPROTO); kfree(rtnl_msg_handlers[protocol]); rtnl_msg_handlers[protocol] = NULL; } EXPORT_SYMBOL_GPL(rtnl_unregister_all); static LIST_HEAD(link_ops); /** * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. * @ops: struct rtnl_link_ops * to register * * The caller must hold the rtnl_mutex. This function should be used * by drivers that create devices during module initialization. It * must be called before registering the devices. * * Returns 0 on success or a negative error code. */ int __rtnl_link_register(struct rtnl_link_ops *ops) { if (!ops->dellink) ops->dellink = unregister_netdevice; list_add_tail(&ops->list, &link_ops); return 0; } EXPORT_SYMBOL_GPL(__rtnl_link_register); /** * rtnl_link_register - Register rtnl_link_ops with rtnetlink. * @ops: struct rtnl_link_ops * to register * * Returns 0 on success or a negative error code. */ int rtnl_link_register(struct rtnl_link_ops *ops) { int err; rtnl_lock(); err = __rtnl_link_register(ops); rtnl_unlock(); return err; } EXPORT_SYMBOL_GPL(rtnl_link_register); static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) { struct net_device *dev; restart: for_each_netdev(net, dev) { if (dev->rtnl_link_ops == ops) { ops->dellink(dev); goto restart; } } } void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) { rtnl_lock(); __rtnl_kill_links(net, ops); rtnl_unlock(); } EXPORT_SYMBOL_GPL(rtnl_kill_links); /** * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. * @ops: struct rtnl_link_ops * to unregister * * The caller must hold the rtnl_mutex. */ void __rtnl_link_unregister(struct rtnl_link_ops *ops) { struct net *net; for_each_net(net) { __rtnl_kill_links(net, ops); } list_del(&ops->list); } EXPORT_SYMBOL_GPL(__rtnl_link_unregister); /** * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. * @ops: struct rtnl_link_ops * to unregister */ void rtnl_link_unregister(struct rtnl_link_ops *ops) { rtnl_lock(); __rtnl_link_unregister(ops); rtnl_unlock(); } EXPORT_SYMBOL_GPL(rtnl_link_unregister); static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) { const struct rtnl_link_ops *ops; list_for_each_entry(ops, &link_ops, list) { if (!strcmp(ops->kind, kind)) return ops; } return NULL; } static size_t rtnl_link_get_size(const struct net_device *dev) { const struct rtnl_link_ops *ops = dev->rtnl_link_ops; size_t size; if (!ops) return 0; size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ if (ops->get_size) /* IFLA_INFO_DATA + nested data */ size += nlmsg_total_size(sizeof(struct nlattr)) + ops->get_size(dev); if (ops->get_xstats_size) size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ return size; } static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) { const struct rtnl_link_ops *ops = dev->rtnl_link_ops; struct nlattr *linkinfo, *data; int err = -EMSGSIZE; linkinfo = nla_nest_start(skb, IFLA_LINKINFO); if (linkinfo == NULL) goto out; if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) goto err_cancel_link; if (ops->fill_xstats) { err = ops->fill_xstats(skb, dev); if (err < 0) goto err_cancel_link; } if (ops->fill_info) { data = nla_nest_start(skb, IFLA_INFO_DATA); if (data == NULL) goto err_cancel_link; err = ops->fill_info(skb, dev); if (err < 0) goto err_cancel_data; nla_nest_end(skb, data); } nla_nest_end(skb, linkinfo); return 0; err_cancel_data: nla_nest_cancel(skb, data); err_cancel_link: nla_nest_cancel(skb, linkinfo); out: return err; } static const int rtm_min[RTM_NR_FAMILIES] = { [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), }; static const int rta_max[RTM_NR_FAMILIES] = { [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, }; void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) { struct rtattr *rta; int size = RTA_LENGTH(attrlen); rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); rta->rta_type = attrtype; rta->rta_len = size; memcpy(RTA_DATA(rta), data, attrlen); memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); } int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) { struct sock *rtnl = net->rtnl; int err = 0; NETLINK_CB(skb).dst_group = group; if (echo) atomic_inc(&skb->users); netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); if (echo) err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); return err; } int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) { struct sock *rtnl = net->rtnl; return nlmsg_unicast(rtnl, skb, pid); } int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, struct nlmsghdr *nlh, gfp_t flags) { struct sock *rtnl = net->rtnl; int report = 0; if (nlh) report = nlmsg_report(nlh); return nlmsg_notify(rtnl, skb, pid, group, report, flags); } void rtnl_set_sk_err(struct net *net, u32 group, int error) { struct sock *rtnl = net->rtnl; netlink_set_err(rtnl, 0, group, error); } int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) { struct nlattr *mx; int i, valid = 0; mx = nla_nest_start(skb, RTA_METRICS); if (mx == NULL) return -ENOBUFS; for (i = 0; i < RTAX_MAX; i++) { if (metrics[i]) { valid++; NLA_PUT_U32(skb, i+1, metrics[i]); } } if (!valid) { nla_nest_cancel(skb, mx); return 0; } return nla_nest_end(skb, mx); nla_put_failure: nla_nest_cancel(skb, mx); return -EMSGSIZE; } int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, u32 ts, u32 tsage, long expires, u32 error) { struct rta_cacheinfo ci = { .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), .rta_used = dst->__use, .rta_clntref = atomic_read(&(dst->__refcnt)), .rta_error = error, .rta_id = id, .rta_ts = ts, .rta_tsage = tsage, }; if (expires) ci.rta_expires = jiffies_to_clock_t(expires); return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); } EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); static void set_operstate(struct net_device *dev, unsigned char transition) { unsigned char operstate = dev->operstate; switch(transition) { case IF_OPER_UP: if ((operstate == IF_OPER_DORMANT || operstate == IF_OPER_UNKNOWN) && !netif_dormant(dev)) operstate = IF_OPER_UP; break; case IF_OPER_DORMANT: if (operstate == IF_OPER_UP || operstate == IF_OPER_UNKNOWN) operstate = IF_OPER_DORMANT; break; } if (dev->operstate != operstate) { write_lock_bh(&dev_base_lock); dev->operstate = operstate; write_unlock_bh(&dev_base_lock); netdev_state_change(dev); } } static void copy_rtnl_link_stats(struct rtnl_link_stats *a, const struct net_device_stats *b) { a->rx_packets = b->rx_packets; a->tx_packets = b->tx_packets; a->rx_bytes = b->rx_bytes; a->tx_bytes = b->tx_bytes; a->rx_errors = b->rx_errors; a->tx_errors = b->tx_errors; a->rx_dropped = b->rx_dropped; a->tx_dropped = b->tx_dropped; a->multicast = b->multicast; a->collisions = b->collisions; a->rx_length_errors = b->rx_length_errors; a->rx_over_errors = b->rx_over_errors; a->rx_crc_errors = b->rx_crc_errors; a->rx_frame_errors = b->rx_frame_errors; a->rx_fifo_errors = b->rx_fifo_errors; a->rx_missed_errors = b->rx_missed_errors; a->tx_aborted_errors = b->tx_aborted_errors; a->tx_carrier_errors = b->tx_carrier_errors; a->tx_fifo_errors = b->tx_fifo_errors; a->tx_heartbeat_errors = b->tx_heartbeat_errors; a->tx_window_errors = b->tx_window_errors; a->rx_compressed = b->rx_compressed; a->tx_compressed = b->tx_compressed; }; static inline size_t if_nlmsg_size(const struct net_device *dev) { return NLMSG_ALIGN(sizeof(struct ifinfomsg)) + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ + nla_total_size(sizeof(struct rtnl_link_ifmap)) + nla_total_size(sizeof(struct rtnl_link_stats)) + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ + nla_total_size(4) /* IFLA_TXQLEN */ + nla_total_size(4) /* IFLA_WEIGHT */ + nla_total_size(4) /* IFLA_MTU */ + nla_total_size(4) /* IFLA_LINK */ + nla_total_size(4) /* IFLA_MASTER */ + nla_total_size(1) /* IFLA_OPERSTATE */ + nla_total_size(1) /* IFLA_LINKMODE */ + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ } static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, int type, u32 pid, u32 seq, u32 change, unsigned int flags) { struct netdev_queue *txq; struct ifinfomsg *ifm; struct nlmsghdr *nlh; const struct net_device_stats *stats; struct nlattr *attr; nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); if (nlh == NULL) return -EMSGSIZE; ifm = nlmsg_data(nlh); ifm->ifi_family = AF_UNSPEC; ifm->__ifi_pad = 0; ifm->ifi_type = dev->type; ifm->ifi_index = dev->ifindex; ifm->ifi_flags = dev_get_flags(dev); ifm->ifi_change = change; NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); NLA_PUT_U8(skb, IFLA_OPERSTATE, netif_running(dev) ? dev->operstate : IF_OPER_DOWN); NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); if (dev->ifindex != dev->iflink) NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); if (dev->master) NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); txq = netdev_get_tx_queue(dev, 0); if (txq->qdisc_sleeping) NLA_PUT_STRING(skb, IFLA_QDISC, txq->qdisc_sleeping->ops->id); if (dev->ifalias) NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); if (1) { struct rtnl_link_ifmap map = { .mem_start = dev->mem_start, .mem_end = dev->mem_end, .base_addr = dev->base_addr, .irq = dev->irq, .dma = dev->dma, .port = dev->if_port, }; NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); } if (dev->addr_len) { NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); } attr = nla_reserve(skb, IFLA_STATS, sizeof(struct rtnl_link_stats)); if (attr == NULL) goto nla_put_failure; stats = dev_get_stats(dev); copy_rtnl_link_stats(nla_data(attr), stats); if (dev->rtnl_link_ops) { if (rtnl_link_fill(skb, dev) < 0) goto nla_put_failure; } return nlmsg_end(skb, nlh); nla_put_failure: nlmsg_cancel(skb, nlh); return -EMSGSIZE; } static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) { struct net *net = sock_net(skb->sk); int idx; int s_idx = cb->args[0]; struct net_device *dev; idx = 0; for_each_netdev(net, dev) { if (idx < s_idx) goto cont; if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) break; cont: idx++; } cb->args[0] = idx; return skb->len; } const struct nla_policy ifla_policy[IFLA_MAX+1] = { [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, [IFLA_MTU] = { .type = NLA_U32 }, [IFLA_LINK] = { .type = NLA_U32 }, [IFLA_TXQLEN] = { .type = NLA_U32 }, [IFLA_WEIGHT] = { .type = NLA_U32 }, [IFLA_OPERSTATE] = { .type = NLA_U8 }, [IFLA_LINKMODE] = { .type = NLA_U8 }, [IFLA_LINKINFO] = { .type = NLA_NESTED }, [IFLA_NET_NS_PID] = { .type = NLA_U32 }, [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, }; static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { [IFLA_INFO_KIND] = { .type = NLA_STRING }, [IFLA_INFO_DATA] = { .type = NLA_NESTED }, }; static struct net *get_net_ns_by_pid(pid_t pid) { struct task_struct *tsk; struct net *net; /* Lookup the network namespace */ net = ERR_PTR(-ESRCH); rcu_read_lock(); tsk = find_task_by_vpid(pid); if (tsk) { struct nsproxy *nsproxy; nsproxy = task_nsproxy(tsk); if (nsproxy) net = get_net(nsproxy->net_ns); } rcu_read_unlock(); return net; } static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) { if (dev) { if (tb[IFLA_ADDRESS] && nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) return -EINVAL; if (tb[IFLA_BROADCAST] && nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) return -EINVAL; } return 0; } static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, struct nlattr **tb, char *ifname, int modified) { const struct net_device_ops *ops = dev->netdev_ops; int send_addr_notify = 0; int err; if (tb[IFLA_NET_NS_PID]) { struct net *net; net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); if (IS_ERR(net)) { err = PTR_ERR(net); goto errout; } err = dev_change_net_namespace(dev, net, ifname); put_net(net); if (err) goto errout; modified = 1; } if (tb[IFLA_MAP]) { struct rtnl_link_ifmap *u_map; struct ifmap k_map; if (!ops->ndo_set_config) { err = -EOPNOTSUPP; goto errout; } if (!netif_device_present(dev)) { err = -ENODEV; goto errout; } u_map = nla_data(tb[IFLA_MAP]); k_map.mem_start = (unsigned long) u_map->mem_start; k_map.mem_end = (unsigned long) u_map->mem_end; k_map.base_addr = (unsigned short) u_map->base_addr; k_map.irq = (unsigned char) u_map->irq; k_map.dma = (unsigned char) u_map->dma; k_map.port = (unsigned char) u_map->port; err = ops->ndo_set_config(dev, &k_map); if (err < 0) goto errout; modified = 1; } if (tb[IFLA_ADDRESS]) { struct sockaddr *sa; int len; if (!ops->ndo_set_mac_address) { err = -EOPNOTSUPP; goto errout; } if (!netif_device_present(dev)) { err = -ENODEV; goto errout; } len = sizeof(sa_family_t) + dev->addr_len; sa = kmalloc(len, GFP_KERNEL); if (!sa) { err = -ENOMEM; goto errout; } sa->sa_family = dev->type; memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), dev->addr_len); err = ops->ndo_set_mac_address(dev, sa); kfree(sa); if (err) goto errout; send_addr_notify = 1; modified = 1; } if (tb[IFLA_MTU]) { err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); if (err < 0) goto errout; modified = 1; } /* * Interface selected by interface index but interface * name provided implies that a name change has been * requested. */ if (ifm->ifi_index > 0 && ifname[0]) { err = dev_change_name(dev, ifname); if (err < 0) goto errout; modified = 1; } if (tb[IFLA_IFALIAS]) { err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), nla_len(tb[IFLA_IFALIAS])); if (err < 0) goto errout; modified = 1; } if (tb[IFLA_BROADCAST]) { nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); send_addr_notify = 1; } if (ifm->ifi_flags || ifm->ifi_change) { unsigned int flags = ifm->ifi_flags; /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ if (ifm->ifi_change) flags = (flags & ifm->ifi_change) | (dev->flags & ~ifm->ifi_change); err = dev_change_flags(dev, flags); if (err < 0) goto errout; } if (tb[IFLA_TXQLEN]) dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); if (tb[IFLA_OPERSTATE]) set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); if (tb[IFLA_LINKMODE]) { write_lock_bh(&dev_base_lock); dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); write_unlock_bh(&dev_base_lock); } err = 0; errout: if (err < 0 && modified && net_ratelimit()) printk(KERN_WARNING "A link change request failed with " "some changes comitted already. Interface %s may " "have been left with an inconsistent configuration, " "please check.\n", dev->name); if (send_addr_notify) call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); return err; } static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct net *net = sock_net(skb->sk); struct ifinfomsg *ifm; struct net_device *dev; int err; struct nlattr *tb[IFLA_MAX+1]; char ifname[IFNAMSIZ]; err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); if (err < 0) goto errout; if (tb[IFLA_IFNAME]) nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); else ifname[0] = '\0'; err = -EINVAL; ifm = nlmsg_data(nlh); if (ifm->ifi_index > 0) dev = dev_get_by_index(net, ifm->ifi_index); else if (tb[IFLA_IFNAME]) dev = dev_get_by_name(net, ifname); else goto errout; if (dev == NULL) { err = -ENODEV; goto errout; } if ((err = validate_linkmsg(dev, tb)) < 0) goto errout_dev; err = do_setlink(dev, ifm, tb, ifname, 0); errout_dev: dev_put(dev); errout: return err; } static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct net *net = sock_net(skb->sk); const struct rtnl_link_ops *ops; struct net_device *dev; struct ifinfomsg *ifm; char ifname[IFNAMSIZ]; struct nlattr *tb[IFLA_MAX+1]; int err; err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); if (err < 0) return err; if (tb[IFLA_IFNAME]) nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); ifm = nlmsg_data(nlh); if (ifm->ifi_index > 0) dev = __dev_get_by_index(net, ifm->ifi_index); else if (tb[IFLA_IFNAME]) dev = __dev_get_by_name(net, ifname); else return -EINVAL; if (!dev) return -ENODEV; ops = dev->rtnl_link_ops; if (!ops) return -EOPNOTSUPP; ops->dellink(dev); return 0; } struct net_device *rtnl_create_link(struct net *net, char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) { int err; struct net_device *dev; err = -ENOMEM; dev = alloc_netdev(ops->priv_size, ifname, ops->setup); if (!dev) goto err; if (strchr(dev->name, '%')) { err = dev_alloc_name(dev, dev->name); if (err < 0) goto err_free; } dev_net_set(dev, net); dev->rtnl_link_ops = ops; if (tb[IFLA_MTU]) dev->mtu = nla_get_u32(tb[IFLA_MTU]); if (tb[IFLA_ADDRESS]) memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), nla_len(tb[IFLA_ADDRESS])); if (tb[IFLA_BROADCAST]) memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), nla_len(tb[IFLA_BROADCAST])); if (tb[IFLA_TXQLEN]) dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); if (tb[IFLA_OPERSTATE]) set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); if (tb[IFLA_LINKMODE]) dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); return dev; err_free: free_netdev(dev); err: return ERR_PTR(err); } static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct net *net = sock_net(skb->sk); const struct rtnl_link_ops *ops; struct net_device *dev; struct ifinfomsg *ifm; char kind[MODULE_NAME_LEN]; char ifname[IFNAMSIZ]; struct nlattr *tb[IFLA_MAX+1]; struct nlattr *linkinfo[IFLA_INFO_MAX+1]; int err; #ifdef CONFIG_MODULES replay: #endif err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); if (err < 0) return err; if (tb[IFLA_IFNAME]) nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); else ifname[0] = '\0'; ifm = nlmsg_data(nlh); if (ifm->ifi_index > 0) dev = __dev_get_by_index(net, ifm->ifi_index); else if (ifname[0]) dev = __dev_get_by_name(net, ifname); else dev = NULL; if ((err = validate_linkmsg(dev, tb)) < 0) return err; if (tb[IFLA_LINKINFO]) { err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO], ifla_info_policy); if (err < 0) return err; } else memset(linkinfo, 0, sizeof(linkinfo)); if (linkinfo[IFLA_INFO_KIND]) { nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); ops = rtnl_link_ops_get(kind); } else { kind[0] = '\0'; ops = NULL; } if (1) { struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; if (ops) { if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { err = nla_parse_nested(attr, ops->maxtype, linkinfo[IFLA_INFO_DATA], ops->policy); if (err < 0) return err; data = attr; } if (ops->validate) { err = ops->validate(tb, data); if (err < 0) return err; } } if (dev) { int modified = 0; if (nlh->nlmsg_flags & NLM_F_EXCL) return -EEXIST; if (nlh->nlmsg_flags & NLM_F_REPLACE) return -EOPNOTSUPP; if (linkinfo[IFLA_INFO_DATA]) { if (!ops || ops != dev->rtnl_link_ops || !ops->changelink) return -EOPNOTSUPP; err = ops->changelink(dev, tb, data); if (err < 0) return err; modified = 1; } return do_setlink(dev, ifm, tb, ifname, modified); } if (!(nlh->nlmsg_flags & NLM_F_CREATE)) return -ENODEV; if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) return -EOPNOTSUPP; if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) return -EOPNOTSUPP; if (!ops) { #ifdef CONFIG_MODULES if (kind[0]) { __rtnl_unlock(); request_module("rtnl-link-%s", kind); rtnl_lock(); ops = rtnl_link_ops_get(kind); if (ops) goto replay; } #endif return -EOPNOTSUPP; } if (!ifname[0]) snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); dev = rtnl_create_link(net, ifname, ops, tb); if (IS_ERR(dev)) err = PTR_ERR(dev); else if (ops->newlink) err = ops->newlink(dev, tb, data); else err = register_netdevice(dev); if (err < 0 && !IS_ERR(dev)) free_netdev(dev); return err; } } static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) { struct net *net = sock_net(skb->sk); struct ifinfomsg *ifm; struct nlattr *tb[IFLA_MAX+1]; struct net_device *dev = NULL; struct sk_buff *nskb; int err; err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); if (err < 0) return err; ifm = nlmsg_data(nlh); if (ifm->ifi_index > 0) { dev = dev_get_by_index(net, ifm->ifi_index); if (dev == NULL) return -ENODEV; } else return -EINVAL; nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); if (nskb == NULL) { err = -ENOBUFS; goto errout; } err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0); if (err < 0) { /* -EMSGSIZE implies BUG in if_nlmsg_size */ WARN_ON(err == -EMSGSIZE); kfree_skb(nskb); goto errout; } err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); errout: dev_put(dev); return err; } static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) { int idx; int s_idx = cb->family; if (s_idx == 0) s_idx = 1; for (idx=1; idx<NPROTO; idx++) { int type = cb->nlh->nlmsg_type-RTM_BASE; if (idx < s_idx || idx == PF_PACKET) continue; if (rtnl_msg_handlers[idx] == NULL || rtnl_msg_handlers[idx][type].dumpit == NULL) continue; if (idx > s_idx) memset(&cb->args[0], 0, sizeof(cb->args)); if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) break; } cb->family = idx; return skb->len; } void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) { struct net *net = dev_net(dev); struct sk_buff *skb; int err = -ENOBUFS; skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); if (skb == NULL) goto errout; err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); if (err < 0) { /* -EMSGSIZE implies BUG in if_nlmsg_size() */ WARN_ON(err == -EMSGSIZE); kfree_skb(skb); goto errout; } err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); errout: if (err < 0) rtnl_set_sk_err(net, RTNLGRP_LINK, err); } /* Protected by RTNL sempahore. */ static struct rtattr **rta_buf; static int rtattr_max; /* Process one rtnetlink message. */ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { struct net *net = sock_net(skb->sk); rtnl_doit_func doit; int sz_idx, kind; int min_len; int family; int type; int err; type = nlh->nlmsg_type; if (type > RTM_MAX) return -EOPNOTSUPP; type -= RTM_BASE; /* All the messages must have at least 1 byte length */ if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) return 0; family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; if (family >= NPROTO) return -EAFNOSUPPORT; sz_idx = type>>2; kind = type&3; if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) return -EPERM; if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { struct sock *rtnl; rtnl_dumpit_func dumpit; dumpit = rtnl_get_dumpit(family, type); if (dumpit == NULL) return -EOPNOTSUPP; __rtnl_unlock(); rtnl = net->rtnl; err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); rtnl_lock(); return err; } memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); min_len = rtm_min[sz_idx]; if (nlh->nlmsg_len < min_len) return -EINVAL; if (nlh->nlmsg_len > min_len) { int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); while (RTA_OK(attr, attrlen)) { unsigned flavor = attr->rta_type; if (flavor) { if (flavor > rta_max[sz_idx]) return -EINVAL; rta_buf[flavor-1] = attr; } attr = RTA_NEXT(attr, attrlen); } } doit = rtnl_get_doit(family, type); if (doit == NULL) return -EOPNOTSUPP; return doit(skb, nlh, (void *)&rta_buf[0]); } static void rtnetlink_rcv(struct sk_buff *skb) { rtnl_lock(); netlink_rcv_skb(skb, &rtnetlink_rcv_msg); rtnl_unlock(); } static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) { struct net_device *dev = ptr; switch (event) { case NETDEV_UNREGISTER: rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); break; case NETDEV_REGISTER: rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); break; case NETDEV_UP: case NETDEV_DOWN: rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); break; case NETDEV_CHANGE: case NETDEV_GOING_DOWN: break; default: rtmsg_ifinfo(RTM_NEWLINK, dev, 0); break; } return NOTIFY_DONE; } static struct notifier_block rtnetlink_dev_notifier = { .notifier_call = rtnetlink_event, }; static int rtnetlink_net_init(struct net *net) { struct sock *sk; sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); if (!sk) return -ENOMEM; net->rtnl = sk; return 0; } static void rtnetlink_net_exit(struct net *net) { netlink_kernel_release(net->rtnl); net->rtnl = NULL; } static struct pernet_operations rtnetlink_net_ops = { .init = rtnetlink_net_init, .exit = rtnetlink_net_exit, }; void __init rtnetlink_init(void) { int i; rtattr_max = 0; for (i = 0; i < ARRAY_SIZE(rta_max); i++) if (rta_max[i] > rtattr_max) rtattr_max = rta_max[i]; rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); if (!rta_buf) panic("rtnetlink_init: cannot allocate rta_buf\n"); if (register_pernet_subsys(&rtnetlink_net_ops)) panic("rtnetlink_init: cannot initialize rtnetlink\n"); netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); register_netdevice_notifier(&rtnetlink_dev_notifier); rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); } EXPORT_SYMBOL(__rta_fill); EXPORT_SYMBOL(rtnetlink_put_metrics); EXPORT_SYMBOL(rtnl_lock); EXPORT_SYMBOL(rtnl_trylock); EXPORT_SYMBOL(rtnl_unlock); EXPORT_SYMBOL(rtnl_is_locked); EXPORT_SYMBOL(rtnl_unicast); EXPORT_SYMBOL(rtnl_notify); EXPORT_SYMBOL(rtnl_set_sk_err); EXPORT_SYMBOL(rtnl_create_link); EXPORT_SYMBOL(ifla_policy);