577 lines
13 KiB
C
577 lines
13 KiB
C
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#include <linux/kmod.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/net_tstamp.h>
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#include <linux/wireless.h>
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#include <net/wext.h>
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/*
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* Map an interface index to its name (SIOCGIFNAME)
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*/
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/*
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* We need this ioctl for efficient implementation of the
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* if_indextoname() function required by the IPv6 API. Without
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* it, we would have to search all the interfaces to find a
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* match. --pb
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*/
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static int dev_ifname(struct net *net, struct ifreq __user *arg)
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{
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struct net_device *dev;
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struct ifreq ifr;
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unsigned seq;
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/*
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* Fetch the caller's info block.
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*/
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if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
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return -EFAULT;
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retry:
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seq = read_seqcount_begin(&devnet_rename_seq);
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
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if (!dev) {
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rcu_read_unlock();
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return -ENODEV;
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}
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strcpy(ifr.ifr_name, dev->name);
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rcu_read_unlock();
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if (read_seqcount_retry(&devnet_rename_seq, seq))
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goto retry;
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if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
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return -EFAULT;
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return 0;
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}
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static gifconf_func_t *gifconf_list[NPROTO];
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/**
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* register_gifconf - register a SIOCGIF handler
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* @family: Address family
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* @gifconf: Function handler
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*
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* Register protocol dependent address dumping routines. The handler
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* that is passed must not be freed or reused until it has been replaced
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* by another handler.
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*/
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int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
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{
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if (family >= NPROTO)
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return -EINVAL;
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gifconf_list[family] = gifconf;
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return 0;
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}
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EXPORT_SYMBOL(register_gifconf);
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/*
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* Perform a SIOCGIFCONF call. This structure will change
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* size eventually, and there is nothing I can do about it.
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* Thus we will need a 'compatibility mode'.
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*/
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static int dev_ifconf(struct net *net, char __user *arg)
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{
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struct ifconf ifc;
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struct net_device *dev;
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char __user *pos;
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int len;
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int total;
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int i;
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/*
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* Fetch the caller's info block.
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*/
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if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
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return -EFAULT;
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pos = ifc.ifc_buf;
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len = ifc.ifc_len;
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/*
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* Loop over the interfaces, and write an info block for each.
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*/
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total = 0;
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for_each_netdev(net, dev) {
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for (i = 0; i < NPROTO; i++) {
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if (gifconf_list[i]) {
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int done;
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if (!pos)
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done = gifconf_list[i](dev, NULL, 0);
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else
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done = gifconf_list[i](dev, pos + total,
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len - total);
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if (done < 0)
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return -EFAULT;
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total += done;
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}
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}
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}
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/*
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* All done. Write the updated control block back to the caller.
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*/
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ifc.ifc_len = total;
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/*
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* Both BSD and Solaris return 0 here, so we do too.
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*/
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return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
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}
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/*
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* Perform the SIOCxIFxxx calls, inside rcu_read_lock()
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*/
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static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
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{
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int err;
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struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
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if (!dev)
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return -ENODEV;
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switch (cmd) {
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case SIOCGIFFLAGS: /* Get interface flags */
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ifr->ifr_flags = (short) dev_get_flags(dev);
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return 0;
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case SIOCGIFMETRIC: /* Get the metric on the interface
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(currently unused) */
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ifr->ifr_metric = 0;
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return 0;
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case SIOCGIFMTU: /* Get the MTU of a device */
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ifr->ifr_mtu = dev->mtu;
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return 0;
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case SIOCGIFHWADDR:
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if (!dev->addr_len)
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memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
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else
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memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
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min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
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ifr->ifr_hwaddr.sa_family = dev->type;
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return 0;
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case SIOCGIFSLAVE:
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err = -EINVAL;
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break;
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case SIOCGIFMAP:
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ifr->ifr_map.mem_start = dev->mem_start;
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ifr->ifr_map.mem_end = dev->mem_end;
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ifr->ifr_map.base_addr = dev->base_addr;
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ifr->ifr_map.irq = dev->irq;
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ifr->ifr_map.dma = dev->dma;
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ifr->ifr_map.port = dev->if_port;
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return 0;
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case SIOCGIFINDEX:
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ifr->ifr_ifindex = dev->ifindex;
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return 0;
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case SIOCGIFTXQLEN:
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ifr->ifr_qlen = dev->tx_queue_len;
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return 0;
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default:
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/* dev_ioctl() should ensure this case
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* is never reached
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*/
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WARN_ON(1);
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err = -ENOTTY;
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break;
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}
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return err;
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}
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static int net_hwtstamp_validate(struct ifreq *ifr)
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{
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struct hwtstamp_config cfg;
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enum hwtstamp_tx_types tx_type;
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enum hwtstamp_rx_filters rx_filter;
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int tx_type_valid = 0;
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int rx_filter_valid = 0;
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if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
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return -EFAULT;
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if (cfg.flags) /* reserved for future extensions */
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return -EINVAL;
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tx_type = cfg.tx_type;
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rx_filter = cfg.rx_filter;
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switch (tx_type) {
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case HWTSTAMP_TX_OFF:
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case HWTSTAMP_TX_ON:
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case HWTSTAMP_TX_ONESTEP_SYNC:
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tx_type_valid = 1;
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break;
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}
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switch (rx_filter) {
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case HWTSTAMP_FILTER_NONE:
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case HWTSTAMP_FILTER_ALL:
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case HWTSTAMP_FILTER_SOME:
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case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
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case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
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case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
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case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
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case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
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case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
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case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
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case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
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case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
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case HWTSTAMP_FILTER_PTP_V2_EVENT:
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case HWTSTAMP_FILTER_PTP_V2_SYNC:
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case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
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rx_filter_valid = 1;
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break;
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}
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if (!tx_type_valid || !rx_filter_valid)
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return -ERANGE;
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return 0;
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}
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/*
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* Perform the SIOCxIFxxx calls, inside rtnl_lock()
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*/
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static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
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{
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int err;
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struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
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const struct net_device_ops *ops;
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if (!dev)
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return -ENODEV;
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ops = dev->netdev_ops;
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switch (cmd) {
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case SIOCSIFFLAGS: /* Set interface flags */
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return dev_change_flags(dev, ifr->ifr_flags);
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case SIOCSIFMETRIC: /* Set the metric on the interface
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(currently unused) */
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return -EOPNOTSUPP;
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case SIOCSIFMTU: /* Set the MTU of a device */
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return dev_set_mtu(dev, ifr->ifr_mtu);
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case SIOCSIFHWADDR:
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return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
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case SIOCSIFHWBROADCAST:
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if (ifr->ifr_hwaddr.sa_family != dev->type)
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return -EINVAL;
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memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
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min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
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call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
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return 0;
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case SIOCSIFMAP:
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if (ops->ndo_set_config) {
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if (!netif_device_present(dev))
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return -ENODEV;
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return ops->ndo_set_config(dev, &ifr->ifr_map);
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}
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return -EOPNOTSUPP;
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case SIOCADDMULTI:
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if (!ops->ndo_set_rx_mode ||
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ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
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return -EINVAL;
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if (!netif_device_present(dev))
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return -ENODEV;
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return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
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case SIOCDELMULTI:
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if (!ops->ndo_set_rx_mode ||
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ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
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return -EINVAL;
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if (!netif_device_present(dev))
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return -ENODEV;
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return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
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case SIOCSIFTXQLEN:
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if (ifr->ifr_qlen < 0)
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return -EINVAL;
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dev->tx_queue_len = ifr->ifr_qlen;
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return 0;
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case SIOCSIFNAME:
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ifr->ifr_newname[IFNAMSIZ-1] = '\0';
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return dev_change_name(dev, ifr->ifr_newname);
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case SIOCSHWTSTAMP:
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err = net_hwtstamp_validate(ifr);
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if (err)
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return err;
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/* fall through */
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/*
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* Unknown or private ioctl
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*/
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default:
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if ((cmd >= SIOCDEVPRIVATE &&
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cmd <= SIOCDEVPRIVATE + 15) ||
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cmd == SIOCBONDENSLAVE ||
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cmd == SIOCBONDRELEASE ||
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cmd == SIOCBONDSETHWADDR ||
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cmd == SIOCBONDSLAVEINFOQUERY ||
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cmd == SIOCBONDINFOQUERY ||
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cmd == SIOCBONDCHANGEACTIVE ||
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cmd == SIOCGMIIPHY ||
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cmd == SIOCGMIIREG ||
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cmd == SIOCSMIIREG ||
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cmd == SIOCBRADDIF ||
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cmd == SIOCBRDELIF ||
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cmd == SIOCSHWTSTAMP ||
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cmd == SIOCWANDEV) {
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err = -EOPNOTSUPP;
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if (ops->ndo_do_ioctl) {
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if (netif_device_present(dev))
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err = ops->ndo_do_ioctl(dev, ifr, cmd);
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else
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err = -ENODEV;
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}
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} else
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err = -EINVAL;
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}
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return err;
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}
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/**
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* dev_load - load a network module
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* @net: the applicable net namespace
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* @name: name of interface
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*
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* If a network interface is not present and the process has suitable
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* privileges this function loads the module. If module loading is not
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* available in this kernel then it becomes a nop.
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*/
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void dev_load(struct net *net, const char *name)
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{
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struct net_device *dev;
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int no_module;
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rcu_read_lock();
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dev = dev_get_by_name_rcu(net, name);
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rcu_read_unlock();
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no_module = !dev;
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if (no_module && capable(CAP_NET_ADMIN))
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no_module = request_module("netdev-%s", name);
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if (no_module && capable(CAP_SYS_MODULE)) {
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if (!request_module("%s", name))
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|
|
pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
|
||
|
|
name);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(dev_load);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This function handles all "interface"-type I/O control requests. The actual
|
||
|
|
* 'doing' part of this is dev_ifsioc above.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* dev_ioctl - network device ioctl
|
||
|
|
* @net: the applicable net namespace
|
||
|
|
* @cmd: command to issue
|
||
|
|
* @arg: pointer to a struct ifreq in user space
|
||
|
|
*
|
||
|
|
* Issue ioctl functions to devices. This is normally called by the
|
||
|
|
* user space syscall interfaces but can sometimes be useful for
|
||
|
|
* other purposes. The return value is the return from the syscall if
|
||
|
|
* positive or a negative errno code on error.
|
||
|
|
*/
|
||
|
|
|
||
|
|
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
||
|
|
{
|
||
|
|
struct ifreq ifr;
|
||
|
|
int ret;
|
||
|
|
char *colon;
|
||
|
|
|
||
|
|
/* One special case: SIOCGIFCONF takes ifconf argument
|
||
|
|
and requires shared lock, because it sleeps writing
|
||
|
|
to user space.
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (cmd == SIOCGIFCONF) {
|
||
|
|
rtnl_lock();
|
||
|
|
ret = dev_ifconf(net, (char __user *) arg);
|
||
|
|
rtnl_unlock();
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
if (cmd == SIOCGIFNAME)
|
||
|
|
return dev_ifname(net, (struct ifreq __user *)arg);
|
||
|
|
|
||
|
|
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
ifr.ifr_name[IFNAMSIZ-1] = 0;
|
||
|
|
|
||
|
|
colon = strchr(ifr.ifr_name, ':');
|
||
|
|
if (colon)
|
||
|
|
*colon = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* See which interface the caller is talking about.
|
||
|
|
*/
|
||
|
|
|
||
|
|
switch (cmd) {
|
||
|
|
/*
|
||
|
|
* These ioctl calls:
|
||
|
|
* - can be done by all.
|
||
|
|
* - atomic and do not require locking.
|
||
|
|
* - return a value
|
||
|
|
*/
|
||
|
|
case SIOCGIFFLAGS:
|
||
|
|
case SIOCGIFMETRIC:
|
||
|
|
case SIOCGIFMTU:
|
||
|
|
case SIOCGIFHWADDR:
|
||
|
|
case SIOCGIFSLAVE:
|
||
|
|
case SIOCGIFMAP:
|
||
|
|
case SIOCGIFINDEX:
|
||
|
|
case SIOCGIFTXQLEN:
|
||
|
|
dev_load(net, ifr.ifr_name);
|
||
|
|
rcu_read_lock();
|
||
|
|
ret = dev_ifsioc_locked(net, &ifr, cmd);
|
||
|
|
rcu_read_unlock();
|
||
|
|
if (!ret) {
|
||
|
|
if (colon)
|
||
|
|
*colon = ':';
|
||
|
|
if (copy_to_user(arg, &ifr,
|
||
|
|
sizeof(struct ifreq)))
|
||
|
|
ret = -EFAULT;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
case SIOCETHTOOL:
|
||
|
|
dev_load(net, ifr.ifr_name);
|
||
|
|
rtnl_lock();
|
||
|
|
ret = dev_ethtool(net, &ifr);
|
||
|
|
rtnl_unlock();
|
||
|
|
if (!ret) {
|
||
|
|
if (colon)
|
||
|
|
*colon = ':';
|
||
|
|
if (copy_to_user(arg, &ifr,
|
||
|
|
sizeof(struct ifreq)))
|
||
|
|
ret = -EFAULT;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* These ioctl calls:
|
||
|
|
* - require superuser power.
|
||
|
|
* - require strict serialization.
|
||
|
|
* - return a value
|
||
|
|
*/
|
||
|
|
case SIOCGMIIPHY:
|
||
|
|
case SIOCGMIIREG:
|
||
|
|
case SIOCSIFNAME:
|
||
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
||
|
|
return -EPERM;
|
||
|
|
dev_load(net, ifr.ifr_name);
|
||
|
|
rtnl_lock();
|
||
|
|
ret = dev_ifsioc(net, &ifr, cmd);
|
||
|
|
rtnl_unlock();
|
||
|
|
if (!ret) {
|
||
|
|
if (colon)
|
||
|
|
*colon = ':';
|
||
|
|
if (copy_to_user(arg, &ifr,
|
||
|
|
sizeof(struct ifreq)))
|
||
|
|
ret = -EFAULT;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* These ioctl calls:
|
||
|
|
* - require superuser power.
|
||
|
|
* - require strict serialization.
|
||
|
|
* - do not return a value
|
||
|
|
*/
|
||
|
|
case SIOCSIFMAP:
|
||
|
|
case SIOCSIFTXQLEN:
|
||
|
|
if (!capable(CAP_NET_ADMIN))
|
||
|
|
return -EPERM;
|
||
|
|
/* fall through */
|
||
|
|
/*
|
||
|
|
* These ioctl calls:
|
||
|
|
* - require local superuser power.
|
||
|
|
* - require strict serialization.
|
||
|
|
* - do not return a value
|
||
|
|
*/
|
||
|
|
case SIOCSIFFLAGS:
|
||
|
|
case SIOCSIFMETRIC:
|
||
|
|
case SIOCSIFMTU:
|
||
|
|
case SIOCSIFHWADDR:
|
||
|
|
case SIOCSIFSLAVE:
|
||
|
|
case SIOCADDMULTI:
|
||
|
|
case SIOCDELMULTI:
|
||
|
|
case SIOCSIFHWBROADCAST:
|
||
|
|
case SIOCSMIIREG:
|
||
|
|
case SIOCBONDENSLAVE:
|
||
|
|
case SIOCBONDRELEASE:
|
||
|
|
case SIOCBONDSETHWADDR:
|
||
|
|
case SIOCBONDCHANGEACTIVE:
|
||
|
|
case SIOCBRADDIF:
|
||
|
|
case SIOCBRDELIF:
|
||
|
|
case SIOCSHWTSTAMP:
|
||
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
||
|
|
return -EPERM;
|
||
|
|
/* fall through */
|
||
|
|
case SIOCBONDSLAVEINFOQUERY:
|
||
|
|
case SIOCBONDINFOQUERY:
|
||
|
|
dev_load(net, ifr.ifr_name);
|
||
|
|
rtnl_lock();
|
||
|
|
ret = dev_ifsioc(net, &ifr, cmd);
|
||
|
|
rtnl_unlock();
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
case SIOCGIFMEM:
|
||
|
|
/* Get the per device memory space. We can add this but
|
||
|
|
* currently do not support it */
|
||
|
|
case SIOCSIFMEM:
|
||
|
|
/* Set the per device memory buffer space.
|
||
|
|
* Not applicable in our case */
|
||
|
|
case SIOCSIFLINK:
|
||
|
|
return -ENOTTY;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Unknown or private ioctl.
|
||
|
|
*/
|
||
|
|
default:
|
||
|
|
if (cmd == SIOCWANDEV ||
|
||
|
|
(cmd >= SIOCDEVPRIVATE &&
|
||
|
|
cmd <= SIOCDEVPRIVATE + 15)) {
|
||
|
|
dev_load(net, ifr.ifr_name);
|
||
|
|
rtnl_lock();
|
||
|
|
ret = dev_ifsioc(net, &ifr, cmd);
|
||
|
|
rtnl_unlock();
|
||
|
|
if (!ret && copy_to_user(arg, &ifr,
|
||
|
|
sizeof(struct ifreq)))
|
||
|
|
ret = -EFAULT;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
/* Take care of Wireless Extensions */
|
||
|
|
if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
|
||
|
|
return wext_handle_ioctl(net, &ifr, cmd, arg);
|
||
|
|
return -ENOTTY;
|
||
|
|
}
|
||
|
|
}
|