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0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/kmod.h>
0003 #include <linux/netdevice.h>
0004 #include <linux/inetdevice.h>
0005 #include <linux/etherdevice.h>
0006 #include <linux/rtnetlink.h>
0007 #include <linux/net_tstamp.h>
0008 #include <linux/wireless.h>
0009 #include <linux/if_bridge.h>
0010 #include <net/dsa.h>
0011 #include <net/wext.h>
0012 
0013 #include "dev.h"
0014 
0015 /*
0016  *  Map an interface index to its name (SIOCGIFNAME)
0017  */
0018 
0019 /*
0020  *  We need this ioctl for efficient implementation of the
0021  *  if_indextoname() function required by the IPv6 API.  Without
0022  *  it, we would have to search all the interfaces to find a
0023  *  match.  --pb
0024  */
0025 
0026 static int dev_ifname(struct net *net, struct ifreq *ifr)
0027 {
0028     ifr->ifr_name[IFNAMSIZ-1] = 0;
0029     return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
0030 }
0031 
0032 /*
0033  *  Perform a SIOCGIFCONF call. This structure will change
0034  *  size eventually, and there is nothing I can do about it.
0035  *  Thus we will need a 'compatibility mode'.
0036  */
0037 int dev_ifconf(struct net *net, struct ifconf __user *uifc)
0038 {
0039     struct net_device *dev;
0040     void __user *pos;
0041     size_t size;
0042     int len, total = 0, done;
0043 
0044     /* both the ifconf and the ifreq structures are slightly different */
0045     if (in_compat_syscall()) {
0046         struct compat_ifconf ifc32;
0047 
0048         if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
0049             return -EFAULT;
0050 
0051         pos = compat_ptr(ifc32.ifcbuf);
0052         len = ifc32.ifc_len;
0053         size = sizeof(struct compat_ifreq);
0054     } else {
0055         struct ifconf ifc;
0056 
0057         if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
0058             return -EFAULT;
0059 
0060         pos = ifc.ifc_buf;
0061         len = ifc.ifc_len;
0062         size = sizeof(struct ifreq);
0063     }
0064 
0065     /* Loop over the interfaces, and write an info block for each. */
0066     rtnl_lock();
0067     for_each_netdev(net, dev) {
0068         if (!pos)
0069             done = inet_gifconf(dev, NULL, 0, size);
0070         else
0071             done = inet_gifconf(dev, pos + total,
0072                         len - total, size);
0073         if (done < 0) {
0074             rtnl_unlock();
0075             return -EFAULT;
0076         }
0077         total += done;
0078     }
0079     rtnl_unlock();
0080 
0081     return put_user(total, &uifc->ifc_len);
0082 }
0083 
0084 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
0085 {
0086     struct ifmap *ifmap = &ifr->ifr_map;
0087 
0088     if (in_compat_syscall()) {
0089         struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;
0090 
0091         cifmap->mem_start = dev->mem_start;
0092         cifmap->mem_end   = dev->mem_end;
0093         cifmap->base_addr = dev->base_addr;
0094         cifmap->irq       = dev->irq;
0095         cifmap->dma       = dev->dma;
0096         cifmap->port      = dev->if_port;
0097 
0098         return 0;
0099     }
0100 
0101     ifmap->mem_start  = dev->mem_start;
0102     ifmap->mem_end    = dev->mem_end;
0103     ifmap->base_addr  = dev->base_addr;
0104     ifmap->irq        = dev->irq;
0105     ifmap->dma        = dev->dma;
0106     ifmap->port       = dev->if_port;
0107 
0108     return 0;
0109 }
0110 
0111 static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
0112 {
0113     struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
0114 
0115     if (!dev->netdev_ops->ndo_set_config)
0116         return -EOPNOTSUPP;
0117 
0118     if (in_compat_syscall()) {
0119         struct ifmap ifmap = {
0120             .mem_start  = cifmap->mem_start,
0121             .mem_end    = cifmap->mem_end,
0122             .base_addr  = cifmap->base_addr,
0123             .irq        = cifmap->irq,
0124             .dma        = cifmap->dma,
0125             .port       = cifmap->port,
0126         };
0127 
0128         return dev->netdev_ops->ndo_set_config(dev, &ifmap);
0129     }
0130 
0131     return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
0132 }
0133 
0134 /*
0135  *  Perform the SIOCxIFxxx calls, inside rcu_read_lock()
0136  */
0137 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
0138 {
0139     int err;
0140     struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
0141 
0142     if (!dev)
0143         return -ENODEV;
0144 
0145     switch (cmd) {
0146     case SIOCGIFFLAGS:  /* Get interface flags */
0147         ifr->ifr_flags = (short) dev_get_flags(dev);
0148         return 0;
0149 
0150     case SIOCGIFMETRIC: /* Get the metric on the interface
0151                    (currently unused) */
0152         ifr->ifr_metric = 0;
0153         return 0;
0154 
0155     case SIOCGIFMTU:    /* Get the MTU of a device */
0156         ifr->ifr_mtu = dev->mtu;
0157         return 0;
0158 
0159     case SIOCGIFSLAVE:
0160         err = -EINVAL;
0161         break;
0162 
0163     case SIOCGIFMAP:
0164         return dev_getifmap(dev, ifr);
0165 
0166     case SIOCGIFINDEX:
0167         ifr->ifr_ifindex = dev->ifindex;
0168         return 0;
0169 
0170     case SIOCGIFTXQLEN:
0171         ifr->ifr_qlen = dev->tx_queue_len;
0172         return 0;
0173 
0174     default:
0175         /* dev_ioctl() should ensure this case
0176          * is never reached
0177          */
0178         WARN_ON(1);
0179         err = -ENOTTY;
0180         break;
0181 
0182     }
0183     return err;
0184 }
0185 
0186 static int net_hwtstamp_validate(struct ifreq *ifr)
0187 {
0188     struct hwtstamp_config cfg;
0189     enum hwtstamp_tx_types tx_type;
0190     enum hwtstamp_rx_filters rx_filter;
0191     int tx_type_valid = 0;
0192     int rx_filter_valid = 0;
0193 
0194     if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
0195         return -EFAULT;
0196 
0197     if (cfg.flags & ~HWTSTAMP_FLAG_MASK)
0198         return -EINVAL;
0199 
0200     tx_type = cfg.tx_type;
0201     rx_filter = cfg.rx_filter;
0202 
0203     switch (tx_type) {
0204     case HWTSTAMP_TX_OFF:
0205     case HWTSTAMP_TX_ON:
0206     case HWTSTAMP_TX_ONESTEP_SYNC:
0207     case HWTSTAMP_TX_ONESTEP_P2P:
0208         tx_type_valid = 1;
0209         break;
0210     case __HWTSTAMP_TX_CNT:
0211         /* not a real value */
0212         break;
0213     }
0214 
0215     switch (rx_filter) {
0216     case HWTSTAMP_FILTER_NONE:
0217     case HWTSTAMP_FILTER_ALL:
0218     case HWTSTAMP_FILTER_SOME:
0219     case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
0220     case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
0221     case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
0222     case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
0223     case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
0224     case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
0225     case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
0226     case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
0227     case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
0228     case HWTSTAMP_FILTER_PTP_V2_EVENT:
0229     case HWTSTAMP_FILTER_PTP_V2_SYNC:
0230     case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
0231     case HWTSTAMP_FILTER_NTP_ALL:
0232         rx_filter_valid = 1;
0233         break;
0234     case __HWTSTAMP_FILTER_CNT:
0235         /* not a real value */
0236         break;
0237     }
0238 
0239     if (!tx_type_valid || !rx_filter_valid)
0240         return -ERANGE;
0241 
0242     return 0;
0243 }
0244 
0245 static int dev_eth_ioctl(struct net_device *dev,
0246              struct ifreq *ifr, unsigned int cmd)
0247 {
0248     const struct net_device_ops *ops = dev->netdev_ops;
0249     int err;
0250 
0251     err = dsa_ndo_eth_ioctl(dev, ifr, cmd);
0252     if (err == 0 || err != -EOPNOTSUPP)
0253         return err;
0254 
0255     if (ops->ndo_eth_ioctl) {
0256         if (netif_device_present(dev))
0257             err = ops->ndo_eth_ioctl(dev, ifr, cmd);
0258         else
0259             err = -ENODEV;
0260     }
0261 
0262     return err;
0263 }
0264 
0265 static int dev_siocbond(struct net_device *dev,
0266             struct ifreq *ifr, unsigned int cmd)
0267 {
0268     const struct net_device_ops *ops = dev->netdev_ops;
0269 
0270     if (ops->ndo_siocbond) {
0271         if (netif_device_present(dev))
0272             return ops->ndo_siocbond(dev, ifr, cmd);
0273         else
0274             return -ENODEV;
0275     }
0276 
0277     return -EOPNOTSUPP;
0278 }
0279 
0280 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
0281                   void __user *data, unsigned int cmd)
0282 {
0283     const struct net_device_ops *ops = dev->netdev_ops;
0284 
0285     if (ops->ndo_siocdevprivate) {
0286         if (netif_device_present(dev))
0287             return ops->ndo_siocdevprivate(dev, ifr, data, cmd);
0288         else
0289             return -ENODEV;
0290     }
0291 
0292     return -EOPNOTSUPP;
0293 }
0294 
0295 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
0296 {
0297     const struct net_device_ops *ops = dev->netdev_ops;
0298 
0299     if (ops->ndo_siocwandev) {
0300         if (netif_device_present(dev))
0301             return ops->ndo_siocwandev(dev, ifs);
0302         else
0303             return -ENODEV;
0304     }
0305 
0306     return -EOPNOTSUPP;
0307 }
0308 
0309 /*
0310  *  Perform the SIOCxIFxxx calls, inside rtnl_lock()
0311  */
0312 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
0313               unsigned int cmd)
0314 {
0315     int err;
0316     struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
0317     const struct net_device_ops *ops;
0318     netdevice_tracker dev_tracker;
0319 
0320     if (!dev)
0321         return -ENODEV;
0322 
0323     ops = dev->netdev_ops;
0324 
0325     switch (cmd) {
0326     case SIOCSIFFLAGS:  /* Set interface flags */
0327         return dev_change_flags(dev, ifr->ifr_flags, NULL);
0328 
0329     case SIOCSIFMETRIC: /* Set the metric on the interface
0330                    (currently unused) */
0331         return -EOPNOTSUPP;
0332 
0333     case SIOCSIFMTU:    /* Set the MTU of a device */
0334         return dev_set_mtu(dev, ifr->ifr_mtu);
0335 
0336     case SIOCSIFHWADDR:
0337         if (dev->addr_len > sizeof(struct sockaddr))
0338             return -EINVAL;
0339         return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
0340 
0341     case SIOCSIFHWBROADCAST:
0342         if (ifr->ifr_hwaddr.sa_family != dev->type)
0343             return -EINVAL;
0344         memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
0345                min(sizeof(ifr->ifr_hwaddr.sa_data),
0346                (size_t)dev->addr_len));
0347         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
0348         return 0;
0349 
0350     case SIOCSIFMAP:
0351         return dev_setifmap(dev, ifr);
0352 
0353     case SIOCADDMULTI:
0354         if (!ops->ndo_set_rx_mode ||
0355             ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
0356             return -EINVAL;
0357         if (!netif_device_present(dev))
0358             return -ENODEV;
0359         return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
0360 
0361     case SIOCDELMULTI:
0362         if (!ops->ndo_set_rx_mode ||
0363             ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
0364             return -EINVAL;
0365         if (!netif_device_present(dev))
0366             return -ENODEV;
0367         return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
0368 
0369     case SIOCSIFTXQLEN:
0370         if (ifr->ifr_qlen < 0)
0371             return -EINVAL;
0372         return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
0373 
0374     case SIOCSIFNAME:
0375         ifr->ifr_newname[IFNAMSIZ-1] = '\0';
0376         return dev_change_name(dev, ifr->ifr_newname);
0377 
0378     case SIOCWANDEV:
0379         return dev_siocwandev(dev, &ifr->ifr_settings);
0380 
0381     case SIOCBRADDIF:
0382     case SIOCBRDELIF:
0383         if (!netif_device_present(dev))
0384             return -ENODEV;
0385         if (!netif_is_bridge_master(dev))
0386             return -EOPNOTSUPP;
0387         netdev_hold(dev, &dev_tracker, GFP_KERNEL);
0388         rtnl_unlock();
0389         err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
0390         netdev_put(dev, &dev_tracker);
0391         rtnl_lock();
0392         return err;
0393 
0394     case SIOCSHWTSTAMP:
0395         err = net_hwtstamp_validate(ifr);
0396         if (err)
0397             return err;
0398         fallthrough;
0399 
0400     /*
0401      *  Unknown or private ioctl
0402      */
0403     default:
0404         if (cmd >= SIOCDEVPRIVATE &&
0405             cmd <= SIOCDEVPRIVATE + 15)
0406             return dev_siocdevprivate(dev, ifr, data, cmd);
0407 
0408         if (cmd == SIOCGMIIPHY ||
0409             cmd == SIOCGMIIREG ||
0410             cmd == SIOCSMIIREG ||
0411             cmd == SIOCSHWTSTAMP ||
0412             cmd == SIOCGHWTSTAMP) {
0413             err = dev_eth_ioctl(dev, ifr, cmd);
0414         } else if (cmd == SIOCBONDENSLAVE ||
0415             cmd == SIOCBONDRELEASE ||
0416             cmd == SIOCBONDSETHWADDR ||
0417             cmd == SIOCBONDSLAVEINFOQUERY ||
0418             cmd == SIOCBONDINFOQUERY ||
0419             cmd == SIOCBONDCHANGEACTIVE) {
0420             err = dev_siocbond(dev, ifr, cmd);
0421         } else
0422             err = -EINVAL;
0423 
0424     }
0425     return err;
0426 }
0427 
0428 /**
0429  *  dev_load    - load a network module
0430  *  @net: the applicable net namespace
0431  *  @name: name of interface
0432  *
0433  *  If a network interface is not present and the process has suitable
0434  *  privileges this function loads the module. If module loading is not
0435  *  available in this kernel then it becomes a nop.
0436  */
0437 
0438 void dev_load(struct net *net, const char *name)
0439 {
0440     struct net_device *dev;
0441     int no_module;
0442 
0443     rcu_read_lock();
0444     dev = dev_get_by_name_rcu(net, name);
0445     rcu_read_unlock();
0446 
0447     no_module = !dev;
0448     if (no_module && capable(CAP_NET_ADMIN))
0449         no_module = request_module("netdev-%s", name);
0450     if (no_module && capable(CAP_SYS_MODULE))
0451         request_module("%s", name);
0452 }
0453 EXPORT_SYMBOL(dev_load);
0454 
0455 /*
0456  *  This function handles all "interface"-type I/O control requests. The actual
0457  *  'doing' part of this is dev_ifsioc above.
0458  */
0459 
0460 /**
0461  *  dev_ioctl   -   network device ioctl
0462  *  @net: the applicable net namespace
0463  *  @cmd: command to issue
0464  *  @ifr: pointer to a struct ifreq in user space
0465  *  @need_copyout: whether or not copy_to_user() should be called
0466  *
0467  *  Issue ioctl functions to devices. This is normally called by the
0468  *  user space syscall interfaces but can sometimes be useful for
0469  *  other purposes. The return value is the return from the syscall if
0470  *  positive or a negative errno code on error.
0471  */
0472 
0473 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
0474           void __user *data, bool *need_copyout)
0475 {
0476     int ret;
0477     char *colon;
0478 
0479     if (need_copyout)
0480         *need_copyout = true;
0481     if (cmd == SIOCGIFNAME)
0482         return dev_ifname(net, ifr);
0483 
0484     ifr->ifr_name[IFNAMSIZ-1] = 0;
0485 
0486     colon = strchr(ifr->ifr_name, ':');
0487     if (colon)
0488         *colon = 0;
0489 
0490     /*
0491      *  See which interface the caller is talking about.
0492      */
0493 
0494     switch (cmd) {
0495     case SIOCGIFHWADDR:
0496         dev_load(net, ifr->ifr_name);
0497         ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
0498         if (colon)
0499             *colon = ':';
0500         return ret;
0501     /*
0502      *  These ioctl calls:
0503      *  - can be done by all.
0504      *  - atomic and do not require locking.
0505      *  - return a value
0506      */
0507     case SIOCGIFFLAGS:
0508     case SIOCGIFMETRIC:
0509     case SIOCGIFMTU:
0510     case SIOCGIFSLAVE:
0511     case SIOCGIFMAP:
0512     case SIOCGIFINDEX:
0513     case SIOCGIFTXQLEN:
0514         dev_load(net, ifr->ifr_name);
0515         rcu_read_lock();
0516         ret = dev_ifsioc_locked(net, ifr, cmd);
0517         rcu_read_unlock();
0518         if (colon)
0519             *colon = ':';
0520         return ret;
0521 
0522     case SIOCETHTOOL:
0523         dev_load(net, ifr->ifr_name);
0524         ret = dev_ethtool(net, ifr, data);
0525         if (colon)
0526             *colon = ':';
0527         return ret;
0528 
0529     /*
0530      *  These ioctl calls:
0531      *  - require superuser power.
0532      *  - require strict serialization.
0533      *  - return a value
0534      */
0535     case SIOCGMIIPHY:
0536     case SIOCGMIIREG:
0537     case SIOCSIFNAME:
0538         dev_load(net, ifr->ifr_name);
0539         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
0540             return -EPERM;
0541         rtnl_lock();
0542         ret = dev_ifsioc(net, ifr, data, cmd);
0543         rtnl_unlock();
0544         if (colon)
0545             *colon = ':';
0546         return ret;
0547 
0548     /*
0549      *  These ioctl calls:
0550      *  - require superuser power.
0551      *  - require strict serialization.
0552      *  - do not return a value
0553      */
0554     case SIOCSIFMAP:
0555     case SIOCSIFTXQLEN:
0556         if (!capable(CAP_NET_ADMIN))
0557             return -EPERM;
0558         fallthrough;
0559     /*
0560      *  These ioctl calls:
0561      *  - require local superuser power.
0562      *  - require strict serialization.
0563      *  - do not return a value
0564      */
0565     case SIOCSIFFLAGS:
0566     case SIOCSIFMETRIC:
0567     case SIOCSIFMTU:
0568     case SIOCSIFHWADDR:
0569     case SIOCSIFSLAVE:
0570     case SIOCADDMULTI:
0571     case SIOCDELMULTI:
0572     case SIOCSIFHWBROADCAST:
0573     case SIOCSMIIREG:
0574     case SIOCBONDENSLAVE:
0575     case SIOCBONDRELEASE:
0576     case SIOCBONDSETHWADDR:
0577     case SIOCBONDCHANGEACTIVE:
0578     case SIOCBRADDIF:
0579     case SIOCBRDELIF:
0580     case SIOCSHWTSTAMP:
0581         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
0582             return -EPERM;
0583         fallthrough;
0584     case SIOCBONDSLAVEINFOQUERY:
0585     case SIOCBONDINFOQUERY:
0586         dev_load(net, ifr->ifr_name);
0587         rtnl_lock();
0588         ret = dev_ifsioc(net, ifr, data, cmd);
0589         rtnl_unlock();
0590         if (need_copyout)
0591             *need_copyout = false;
0592         return ret;
0593 
0594     case SIOCGIFMEM:
0595         /* Get the per device memory space. We can add this but
0596          * currently do not support it */
0597     case SIOCSIFMEM:
0598         /* Set the per device memory buffer space.
0599          * Not applicable in our case */
0600     case SIOCSIFLINK:
0601         return -ENOTTY;
0602 
0603     /*
0604      *  Unknown or private ioctl.
0605      */
0606     default:
0607         if (cmd == SIOCWANDEV ||
0608             cmd == SIOCGHWTSTAMP ||
0609             (cmd >= SIOCDEVPRIVATE &&
0610              cmd <= SIOCDEVPRIVATE + 15)) {
0611             dev_load(net, ifr->ifr_name);
0612             rtnl_lock();
0613             ret = dev_ifsioc(net, ifr, data, cmd);
0614             rtnl_unlock();
0615             return ret;
0616         }
0617         return -ENOTTY;
0618     }
0619 }
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