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https://github.com/edk2-porting/linux-next.git
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ec9c948546
Adjust the new netdevice scanning code provided by Patrick McHardy:
(1) Restore the function banner comments that were dropped.
(2) Rather than using an array size of 6 in some places and an array size of
ETH_ALEN in others, pass a pointer instead and pass the array size
through so that we can actually check it.
(3) Do the buffer fill count check before checking the for_primary_ifa
condition again. This permits us to skip that check should maxbufs be
reached before we run out of interfaces.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
/* AFS network device helpers
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*
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* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
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*/
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#include <linux/string.h>
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#include <linux/rtnetlink.h>
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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include "internal.h"
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/*
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* get a MAC address from a random ethernet interface that has a real one
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* - the buffer will normally be 6 bytes in size
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*/
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int afs_get_MAC_address(u8 *mac, size_t maclen)
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{
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struct net_device *dev;
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int ret = -ENODEV;
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if (maclen != ETH_ALEN)
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BUG();
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rtnl_lock();
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dev = __dev_getfirstbyhwtype(ARPHRD_ETHER);
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if (dev) {
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memcpy(mac, dev->dev_addr, maclen);
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ret = 0;
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}
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rtnl_unlock();
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return ret;
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}
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/*
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* get a list of this system's interface IPv4 addresses, netmasks and MTUs
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* - maxbufs must be at least 1
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* - returns the number of interface records in the buffer
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*/
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int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
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bool wantloopback)
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{
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struct net_device *dev;
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struct in_device *idev;
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int n = 0;
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ASSERT(maxbufs > 0);
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rtnl_lock();
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for (dev = dev_base; dev; dev = dev->next) {
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if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
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continue;
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idev = __in_dev_get_rtnl(dev);
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if (!idev)
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continue;
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for_primary_ifa(idev) {
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bufs[n].address.s_addr = ifa->ifa_address;
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bufs[n].netmask.s_addr = ifa->ifa_mask;
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bufs[n].mtu = dev->mtu;
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n++;
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if (n >= maxbufs)
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goto out;
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} endfor_ifa(idev);
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}
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out:
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rtnl_unlock();
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return n;
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}
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