[IPV6]: ADDRCONF: Use our standard algorithm for randomized ifid.
RFC 3041 describes an algorithm to generate random interface identifier. In RFC 3041bis, it is allowed to use different algorithm than one described in RFC 3041. So, let's use our standard pseudo random algorithm to simplify our implementation. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki
David S. Miller
Родитель
955aaa2fe3
Коммит
955189efb4
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@ -180,11 +180,8 @@ struct inet6_dev
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#ifdef CONFIG_IPV6_PRIVACY
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u8 rndid[8];
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u8 entropy[8];
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struct timer_list regen_timer;
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struct inet6_ifaddr *tempaddr_list;
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__u8 work_eui64[8];
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__u8 work_digest[16];
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#endif
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struct neigh_parms *nd_parms;
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@ -6,8 +6,6 @@
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config IPV6
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tristate "The IPv6 protocol"
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default m
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select CRYPTO if IPV6_PRIVACY
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select CRYPTO_MD5 if IPV6_PRIVACY
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---help---
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This is complemental support for the IP version 6.
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You will still be able to do traditional IPv4 networking as well.
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@ -22,7 +20,7 @@ config IPV6
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module will be called ipv6.
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config IPV6_PRIVACY
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bool "IPv6: Privacy Extensions (RFC 3041) support"
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bool "IPv6: Privacy Extensions support"
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depends on IPV6
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---help---
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Privacy Extensions for Stateless Address Autoconfiguration in IPv6
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@ -30,6 +28,9 @@ config IPV6_PRIVACY
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pseudo-random global-scope unicast address(es) will assigned to
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your interface(s).
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We use our standard pseudo random algorithm to generate randomized
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interface identifier, instead of one described in RFC 3041.
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By default, kernel do not generate temporary addresses.
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To use temporary addresses, do
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@ -78,8 +78,6 @@
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#ifdef CONFIG_IPV6_PRIVACY
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#include <linux/random.h>
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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#endif
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#include <asm/uaccess.h>
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@ -110,8 +108,6 @@ static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpad
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static void ipv6_regen_rndid(unsigned long data);
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static int desync_factor = MAX_DESYNC_FACTOR * HZ;
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static struct crypto_tfm *md5_tfm;
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static DEFINE_SPINLOCK(md5_tfm_lock);
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#endif
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static int ipv6_count_addresses(struct inet6_dev *idev);
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@ -371,8 +367,6 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
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in6_dev_hold(ndev);
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#ifdef CONFIG_IPV6_PRIVACY
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get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
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get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
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init_timer(&ndev->regen_timer);
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ndev->regen_timer.function = ipv6_regen_rndid;
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ndev->regen_timer.data = (unsigned long) ndev;
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@ -1376,34 +1370,9 @@ static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
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/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
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static int __ipv6_regen_rndid(struct inet6_dev *idev)
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{
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struct net_device *dev;
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struct scatterlist sg[2];
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sg_set_buf(&sg[0], idev->entropy, 8);
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sg_set_buf(&sg[1], idev->work_eui64, 8);
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dev = idev->dev;
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if (ipv6_generate_eui64(idev->work_eui64, dev)) {
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printk(KERN_INFO
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"__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
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idev);
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get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
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}
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regen:
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spin_lock(&md5_tfm_lock);
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if (unlikely(md5_tfm == NULL)) {
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spin_unlock(&md5_tfm_lock);
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return -1;
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}
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crypto_digest_init(md5_tfm);
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crypto_digest_update(md5_tfm, sg, 2);
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crypto_digest_final(md5_tfm, idev->work_digest);
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spin_unlock(&md5_tfm_lock);
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memcpy(idev->rndid, &idev->work_digest[0], 8);
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get_random_bytes(idev->rndid, sizeof(idev->rndid));
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idev->rndid[0] &= ~0x02;
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memcpy(idev->entropy, &idev->work_digest[8], 8);
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/*
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* <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
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@ -3759,13 +3728,6 @@ int __init addrconf_init(void)
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register_netdevice_notifier(&ipv6_dev_notf);
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#ifdef CONFIG_IPV6_PRIVACY
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md5_tfm = crypto_alloc_tfm("md5", 0);
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if (unlikely(md5_tfm == NULL))
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printk(KERN_WARNING
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"failed to load transform for md5\n");
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#endif
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addrconf_verify(0);
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rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
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#ifdef CONFIG_SYSCTL
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@ -3828,11 +3790,6 @@ void __exit addrconf_cleanup(void)
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rtnl_unlock();
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#ifdef CONFIG_IPV6_PRIVACY
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crypto_free_tfm(md5_tfm);
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md5_tfm = NULL;
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#endif
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#ifdef CONFIG_PROC_FS
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proc_net_remove("if_inet6");
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#endif
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