mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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73 lines
2.1 KiB
Diff
73 lines
2.1 KiB
Diff
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From 1287da9da56cc8e074d7d2afed677e65cf77c720 Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Mon, 17 Nov 2014 05:28:09 -0500
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Subject: [PATCH] add MAC randomization
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based on https://grsecurity.net/~spender/random_mac.diff
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---
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net/core/dev.c | 19 +++++++++++++++++++
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net/core/sysctl_net_core.c | 10 ++++++++++
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2 files changed, 29 insertions(+)
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diff --git a/net/core/dev.c b/net/core/dev.c
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index 70145dc..d662c0f 100644
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -178,6 +178,7 @@
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static DEFINE_SPINLOCK(ptype_lock);
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static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
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static struct list_head ptype_all __read_mostly; /* Taps */
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+int randomize_mac = 1;
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/*
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* The @dev_base_head list is protected by @dev_base_lock and the rtnl
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@@ -4717,6 +4718,24 @@ int dev_change_flags(struct net_device *dev, unsigned int flags)
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rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
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__dev_notify_flags(dev, old_flags);
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+
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+ if (randomize_mac && (changes & IFF_UP) && !(old_flags & IFF_UP)) {
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+ /* randomize MAC whenever interface is brought up */
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+ struct sockaddr sa;
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+ unsigned int mac4;
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+ unsigned short mac2;
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+
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+ mac4 = random32();
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+ mac2 = random32();
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+ memcpy(sa.sa_data, &mac4, sizeof(mac4));
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+ memcpy((char *)sa.sa_data + sizeof(mac4), &mac2, sizeof(mac2));
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+ if (!is_valid_ether_addr(sa.sa_data))
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+ sa.sa_data[5] = 1;
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+ sa.sa_data[0] &= 0xFC;
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+ sa.sa_family = dev->type;
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+ dev_set_mac_address(dev, &sa);
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+ }
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+
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return ret;
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}
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EXPORT_SYMBOL(dev_change_flags);
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diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
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index 0c28508..42b3ad3 100644
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--- a/net/core/sysctl_net_core.c
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+++ b/net/core/sysctl_net_core.c
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@@ -84,9 +84,19 @@ static int rps_sock_flow_sysctl(ctl_table *table, int write,
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}
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#endif /* CONFIG_RPS */
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+extern int randomize_mac;
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+
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static struct ctl_table net_core_table[] = {
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#ifdef CONFIG_NET
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{
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+ .procname = "randomize_mac",
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+ .data = &randomize_mac,
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+ .maxlen = sizeof(int),
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+ .mode = 0644,
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+ .proc_handler = proc_dointvec
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+ },
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+
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+ {
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.procname = "wmem_max",
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.data = &sysctl_wmem_max,
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.maxlen = sizeof(int),
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