| /* |
| * 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/pci.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/system.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> |
| #include <net/net_namespace.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); |
| } |
| EXPORT_SYMBOL(rtnl_lock); |
| |
| void __rtnl_unlock(void) |
| { |
| mutex_unlock(&rtnl_mutex); |
| } |
| |
| void rtnl_unlock(void) |
| { |
| /* This fellow will unlock it for us. */ |
| netdev_run_todo(); |
| } |
| EXPORT_SYMBOL(rtnl_unlock); |
| |
| int rtnl_trylock(void) |
| { |
| return mutex_trylock(&rtnl_mutex); |
| } |
| EXPORT_SYMBOL(rtnl_trylock); |
| |
| int rtnl_is_locked(void) |
| { |
| return mutex_is_locked(&rtnl_mutex); |
| } |
| EXPORT_SYMBOL(rtnl_is_locked); |
| |
| 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_queue; |
| |
| 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; |
| LIST_HEAD(list_kill); |
| |
| for_each_netdev(net, dev) { |
| if (dev->rtnl_link_ops == ops) |
| ops->dellink(dev, &list_kill); |
| } |
| unregister_netdevice_many(&list_kill); |
| } |
| |
| 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); |
| } |
| EXPORT_SYMBOL(__rta_fill); |
| |
| 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); |
| } |
| EXPORT_SYMBOL(rtnl_unicast); |
| |
| void 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); |
| |
| nlmsg_notify(rtnl, skb, pid, group, report, flags); |
| } |
| EXPORT_SYMBOL(rtnl_notify); |
| |
| void rtnl_set_sk_err(struct net *net, u32 group, int error) |
| { |
| struct sock *rtnl = net->rtnl; |
| |
| netlink_set_err(rtnl, 0, group, error); |
| } |
| EXPORT_SYMBOL(rtnl_set_sk_err); |
| |
| 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; |
| } |
| EXPORT_SYMBOL(rtnetlink_put_metrics); |
| |
| 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 int rtnl_vfinfo_size(const struct net_device *dev) |
| { |
| if (dev->dev.parent && dev_is_pci(dev->dev.parent)) |
| return dev_num_vf(dev->dev.parent) * |
| sizeof(struct ifla_vf_info); |
| else |
| return 0; |
| } |
| |
| 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 */ |
| + nla_total_size(4) /* IFLA_NUM_VF */ |
| + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */ |
| + 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 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); |
| |
| if (dev->qdisc) |
| NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->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->netdev_ops->ndo_get_vf_config && dev->dev.parent) { |
| int i; |
| struct ifla_vf_info ivi; |
| |
| NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)); |
| for (i = 0; i < dev_num_vf(dev->dev.parent); i++) { |
| if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi)) |
| break; |
| NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi); |
| } |
| } |
| 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 h, s_h; |
| int idx = 0, s_idx; |
| struct net_device *dev; |
| struct hlist_head *head; |
| struct hlist_node *node; |
| |
| s_h = cb->args[0]; |
| s_idx = cb->args[1]; |
| |
| for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { |
| idx = 0; |
| head = &net->dev_index_head[h]; |
| hlist_for_each_entry(dev, node, head, index_hlist) { |
| 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) |
| goto out; |
| cont: |
| idx++; |
| } |
| } |
| out: |
| cb->args[1] = idx; |
| cb->args[0] = h; |
| |
| 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 }, |
| [IFLA_VF_MAC] = { .type = NLA_BINARY, |
| .len = sizeof(struct ifla_vf_mac) }, |
| [IFLA_VF_VLAN] = { .type = NLA_BINARY, |
| .len = sizeof(struct ifla_vf_vlan) }, |
| [IFLA_VF_TX_RATE] = { .type = NLA_BINARY, |
| .len = sizeof(struct ifla_vf_tx_rate) }, |
| }; |
| EXPORT_SYMBOL(ifla_policy); |
| |
| static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { |
| [IFLA_INFO_KIND] = { .type = NLA_STRING }, |
| [IFLA_INFO_DATA] = { .type = NLA_NESTED }, |
| }; |
| |
| struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) |
| { |
| struct net *net; |
| /* Examine the link attributes and figure out which |
| * network namespace we are talking about. |
| */ |
| if (tb[IFLA_NET_NS_PID]) |
| net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); |
| else |
| net = get_net(src_net); |
| return net; |
| } |
| EXPORT_SYMBOL(rtnl_link_get_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 = rtnl_link_get_net(dev_net(dev), tb); |
| 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); |
| } |
| |
| if (tb[IFLA_VF_MAC]) { |
| struct ifla_vf_mac *ivm; |
| ivm = nla_data(tb[IFLA_VF_MAC]); |
| write_lock_bh(&dev_base_lock); |
| if (ops->ndo_set_vf_mac) |
| err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac); |
| write_unlock_bh(&dev_base_lock); |
| if (err < 0) |
| goto errout; |
| modified = 1; |
| } |
| |
| if (tb[IFLA_VF_VLAN]) { |
| struct ifla_vf_vlan *ivv; |
| ivv = nla_data(tb[IFLA_VF_VLAN]); |
| write_lock_bh(&dev_base_lock); |
| if (ops->ndo_set_vf_vlan) |
| err = ops->ndo_set_vf_vlan(dev, ivv->vf, |
| (u16)ivv->vlan, |
| (u8)ivv->qos); |
| write_unlock_bh(&dev_base_lock); |
| if (err < 0) |
| goto errout; |
| modified = 1; |
| } |
| err = 0; |
| |
| if (tb[IFLA_VF_TX_RATE]) { |
| struct ifla_vf_tx_rate *ivt; |
| ivt = nla_data(tb[IFLA_VF_TX_RATE]); |
| write_lock_bh(&dev_base_lock); |
| if (ops->ndo_set_vf_tx_rate) |
| err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate); |
| write_unlock_bh(&dev_base_lock); |
| if (err < 0) |
| goto errout; |
| modified = 1; |
| } |
| 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; |
| } |
| |
| err = validate_linkmsg(dev, tb); |
| if (err < 0) |
| goto errout; |
| |
| err = do_setlink(dev, ifm, tb, ifname, 0); |
| 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, NULL); |
| return 0; |
| } |
| |
| struct net_device *rtnl_create_link(struct net *src_net, struct net *net, |
| char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) |
| { |
| int err; |
| struct net_device *dev; |
| unsigned int num_queues = 1; |
| unsigned int real_num_queues = 1; |
| |
| if (ops->get_tx_queues) { |
| err = ops->get_tx_queues(src_net, tb, &num_queues, |
| &real_num_queues); |
| if (err) |
| goto err; |
| } |
| err = -ENOMEM; |
| dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); |
| if (!dev) |
| goto err; |
| |
| dev_net_set(dev, net); |
| dev->rtnl_link_ops = ops; |
| dev->real_num_tx_queues = real_num_queues; |
| |
| if (strchr(dev->name, '%')) { |
| err = dev_alloc_name(dev, dev->name); |
| if (err < 0) |
| goto err_free; |
| } |
| |
| 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); |
| } |
| EXPORT_SYMBOL(rtnl_create_link); |
| |
| 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; |
| |
| err = validate_linkmsg(dev, tb); |
| if (err < 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; |
| struct net *dest_net; |
| |
| 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); |
| |
| dest_net = rtnl_link_get_net(net, tb); |
| dev = rtnl_create_link(net, dest_net, ifname, ops, tb); |
| |
| if (IS_ERR(dev)) |
| err = PTR_ERR(dev); |
| else if (ops->newlink) |
| err = ops->newlink(net, dev, tb, data); |
| else |
| err = register_netdevice(dev); |
| if (err < 0 && !IS_ERR(dev)) |
| free_netdev(dev); |
| |
| put_net(dest_net); |
| 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; |
| char ifname[IFNAMSIZ]; |
| 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; |
| |
| 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 == NULL) |
| return -ENODEV; |
| |
| nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
| if (nskb == NULL) |
| return -ENOBUFS; |
| |
| 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); |
| } else |
| err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); |
| |
| 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; |
| } |
| rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); |
| return; |
| 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_UP: |
| case NETDEV_DOWN: |
| rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); |
| break; |
| case NETDEV_POST_INIT: |
| case NETDEV_REGISTER: |
| case NETDEV_CHANGE: |
| case NETDEV_GOING_DOWN: |
| case NETDEV_UNREGISTER_BATCH: |
| 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 __net_init 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 __net_exit 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); |
| } |
| |