| /* |
| * 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 <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> |
| #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
| #include <linux/wireless.h> |
| #include <net/iw_handler.h> |
| #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ |
| |
| struct rtnl_link |
| { |
| rtnl_doit_func doit; |
| rtnl_dumpit_func dumpit; |
| }; |
| |
| static DEFINE_MUTEX(rtnl_mutex); |
| static struct sock *rtnl; |
| |
| void rtnl_lock(void) |
| { |
| mutex_lock(&rtnl_mutex); |
| } |
| |
| void __rtnl_unlock(void) |
| { |
| mutex_unlock(&rtnl_mutex); |
| } |
| |
| void rtnl_unlock(void) |
| { |
| mutex_unlock(&rtnl_mutex); |
| if (rtnl && rtnl->sk_receive_queue.qlen) |
| rtnl->sk_data_ready(rtnl, 0); |
| netdev_run_todo(); |
| } |
| |
| int rtnl_trylock(void) |
| { |
| return mutex_trylock(&rtnl_mutex); |
| } |
| |
| int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len) |
| { |
| memset(tb, 0, sizeof(struct rtattr*)*maxattr); |
| |
| while (RTA_OK(rta, len)) { |
| unsigned flavor = rta->rta_type; |
| if (flavor && flavor <= maxattr) |
| tb[flavor-1] = rta; |
| rta = RTA_NEXT(rta, len); |
| } |
| return 0; |
| } |
| |
| 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 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); |
| } |
| |
| size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) |
| { |
| size_t ret = RTA_PAYLOAD(rta); |
| char *src = RTA_DATA(rta); |
| |
| if (ret > 0 && src[ret - 1] == '\0') |
| ret--; |
| if (size > 0) { |
| size_t len = (ret >= size) ? size - 1 : ret; |
| memset(dest, 0, size); |
| memcpy(dest, src, len); |
| } |
| return ret; |
| } |
| |
| int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) |
| { |
| 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, u32 pid) |
| { |
| return nlmsg_unicast(rtnl, skb, pid); |
| } |
| |
| int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group, |
| struct nlmsghdr *nlh, gfp_t flags) |
| { |
| int report = 0; |
| |
| if (nlh) |
| report = nlmsg_report(nlh); |
| |
| return nlmsg_notify(rtnl, skb, pid, group, report, flags); |
| } |
| |
| void rtnl_set_sk_err(u32 group, int error) |
| { |
| 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: |
| return nla_nest_cancel(skb, mx); |
| } |
| |
| 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, |
| 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(int iwbuflen) |
| { |
| return NLMSG_ALIGN(sizeof(struct ifinfomsg)) |
| + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ |
| + 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(iwbuflen); |
| } |
| |
| static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
| void *iwbuf, int iwbuflen, int type, u32 pid, |
| u32 seq, u32 change, unsigned int flags) |
| { |
| struct ifinfomsg *ifm; |
| struct nlmsghdr *nlh; |
| |
| 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_U32(skb, IFLA_WEIGHT, dev->weight); |
| 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_sleeping) |
| NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); |
| |
| 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); |
| } |
| |
| if (dev->get_stats) { |
| struct net_device_stats *stats = dev->get_stats(dev); |
| if (stats) { |
| struct nlattr *attr; |
| |
| attr = nla_reserve(skb, IFLA_STATS, |
| sizeof(struct rtnl_link_stats)); |
| if (attr == NULL) |
| goto nla_put_failure; |
| |
| copy_rtnl_link_stats(nla_data(attr), stats); |
| } |
| } |
| |
| if (iwbuf) |
| NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf); |
| |
| 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) |
| { |
| int idx; |
| int s_idx = cb->args[0]; |
| struct net_device *dev; |
| |
| read_lock(&dev_base_lock); |
| for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { |
| if (idx < s_idx) |
| continue; |
| if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK, |
| NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) |
| break; |
| } |
| read_unlock(&dev_base_lock); |
| cb->args[0] = idx; |
| |
| return skb->len; |
| } |
| |
| static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = { |
| [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, |
| [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, |
| [IFLA_MTU] = { .type = NLA_U32 }, |
| [IFLA_TXQLEN] = { .type = NLA_U32 }, |
| [IFLA_WEIGHT] = { .type = NLA_U32 }, |
| [IFLA_OPERSTATE] = { .type = NLA_U8 }, |
| [IFLA_LINKMODE] = { .type = NLA_U8 }, |
| }; |
| |
| static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
| { |
| struct ifinfomsg *ifm; |
| struct net_device *dev; |
| int err, send_addr_notify = 0, modified = 0; |
| 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(ifm->ifi_index); |
| else if (tb[IFLA_IFNAME]) |
| dev = dev_get_by_name(ifname); |
| else |
| goto errout; |
| |
| if (dev == NULL) { |
| err = -ENODEV; |
| goto errout; |
| } |
| |
| if (tb[IFLA_ADDRESS] && |
| nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) |
| goto errout_dev; |
| |
| if (tb[IFLA_BROADCAST] && |
| nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) |
| goto errout_dev; |
| |
| if (tb[IFLA_MAP]) { |
| struct rtnl_link_ifmap *u_map; |
| struct ifmap k_map; |
| |
| if (!dev->set_config) { |
| err = -EOPNOTSUPP; |
| goto errout_dev; |
| } |
| |
| if (!netif_device_present(dev)) { |
| err = -ENODEV; |
| goto errout_dev; |
| } |
| |
| 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 = dev->set_config(dev, &k_map); |
| if (err < 0) |
| goto errout_dev; |
| |
| modified = 1; |
| } |
| |
| if (tb[IFLA_ADDRESS]) { |
| struct sockaddr *sa; |
| int len; |
| |
| if (!dev->set_mac_address) { |
| err = -EOPNOTSUPP; |
| goto errout_dev; |
| } |
| |
| if (!netif_device_present(dev)) { |
| err = -ENODEV; |
| goto errout_dev; |
| } |
| |
| len = sizeof(sa_family_t) + dev->addr_len; |
| sa = kmalloc(len, GFP_KERNEL); |
| if (!sa) { |
| err = -ENOMEM; |
| goto errout_dev; |
| } |
| sa->sa_family = dev->type; |
| memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
| dev->addr_len); |
| err = dev->set_mac_address(dev, sa); |
| kfree(sa); |
| if (err) |
| goto errout_dev; |
| 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_dev; |
| 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_dev; |
| modified = 1; |
| } |
| |
| #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
| if (tb[IFLA_WIRELESS]) { |
| /* Call Wireless Extensions. |
| * Various stuff checked in there... */ |
| err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]), |
| nla_len(tb[IFLA_WIRELESS])); |
| if (err < 0) |
| goto errout_dev; |
| } |
| #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ |
| |
| if (tb[IFLA_BROADCAST]) { |
| nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); |
| send_addr_notify = 1; |
| } |
| |
| |
| if (ifm->ifi_flags) |
| dev_change_flags(dev, ifm->ifi_flags); |
| |
| if (tb[IFLA_TXQLEN]) |
| dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); |
| |
| if (tb[IFLA_WEIGHT]) |
| dev->weight = nla_get_u32(tb[IFLA_WEIGHT]); |
| |
| 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_dev: |
| 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); |
| |
| dev_put(dev); |
| errout: |
| return err; |
| } |
| |
| static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
| { |
| struct ifinfomsg *ifm; |
| struct nlattr *tb[IFLA_MAX+1]; |
| struct net_device *dev = NULL; |
| struct sk_buff *nskb; |
| char *iw_buf = NULL, *iw = NULL; |
| int iw_buf_len = 0; |
| 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(ifm->ifi_index); |
| if (dev == NULL) |
| return -ENODEV; |
| } else |
| return -EINVAL; |
| |
| |
| #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
| if (tb[IFLA_WIRELESS]) { |
| /* Call Wireless Extensions. We need to know the size before |
| * we can alloc. Various stuff checked in there... */ |
| err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]), |
| nla_len(tb[IFLA_WIRELESS]), |
| &iw_buf, &iw_buf_len); |
| if (err < 0) |
| goto errout; |
| |
| /* Payload is at an offset in buffer */ |
| iw = iw_buf + IW_EV_POINT_OFF; |
| } |
| #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ |
| |
| nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL); |
| if (nskb == NULL) { |
| err = -ENOBUFS; |
| goto errout; |
| } |
| |
| err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, 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, NETLINK_CB(skb).pid); |
| errout: |
| kfree(iw_buf); |
| dev_put(dev); |
| |
| return err; |
| } |
| |
| 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; |
| } |
| |
| EXPORT_SYMBOL_GPL(rtnl_dump_all); |
| |
| void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) |
| { |
| struct sk_buff *skb; |
| int err = -ENOBUFS; |
| |
| skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL); |
| if (skb == NULL) |
| goto errout; |
| |
| err = rtnl_fill_ifinfo(skb, dev, NULL, 0, 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, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); |
| errout: |
| if (err < 0) |
| rtnl_set_sk_err(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) |
| { |
| rtnl_doit_func doit; |
| int sz_idx, kind; |
| int min_len; |
| int family; |
| int type; |
| |
| type = nlh->nlmsg_type; |
| if (type > RTM_MAX) |
| return -EINVAL; |
| |
| 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) { |
| rtnl_dumpit_func dumpit; |
| |
| dumpit = rtnl_get_dumpit(family, type); |
| if (dumpit == NULL) |
| return -EINVAL; |
| |
| return netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); |
| } |
| |
| 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 -EINVAL; |
| |
| return doit(skb, nlh, (void *)&rta_buf[0]); |
| } |
| |
| static void rtnetlink_rcv(struct sock *sk, int len) |
| { |
| unsigned int qlen = 0; |
| |
| do { |
| mutex_lock(&rtnl_mutex); |
| netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); |
| mutex_unlock(&rtnl_mutex); |
| |
| netdev_run_todo(); |
| } while (qlen); |
| } |
| |
| 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, |
| }; |
| |
| 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"); |
| |
| rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, |
| THIS_MODULE); |
| if (rtnl == NULL) |
| 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_GETADDR, NULL, rtnl_dump_all); |
| rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); |
| } |
| |
| EXPORT_SYMBOL(__rta_fill); |
| EXPORT_SYMBOL(rtattr_strlcpy); |
| EXPORT_SYMBOL(rtattr_parse); |
| EXPORT_SYMBOL(rtnetlink_put_metrics); |
| EXPORT_SYMBOL(rtnl_lock); |
| EXPORT_SYMBOL(rtnl_trylock); |
| EXPORT_SYMBOL(rtnl_unlock); |
| EXPORT_SYMBOL(rtnl_unicast); |
| EXPORT_SYMBOL(rtnl_notify); |
| EXPORT_SYMBOL(rtnl_set_sk_err); |