diff options
Diffstat (limited to 'target/linux/uml/patches-5.10/102-pseudo-random-mac.patch')
| -rw-r--r-- | target/linux/uml/patches-5.10/102-pseudo-random-mac.patch | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/target/linux/uml/patches-5.10/102-pseudo-random-mac.patch b/target/linux/uml/patches-5.10/102-pseudo-random-mac.patch deleted file mode 100644 index a4e6500f94..0000000000 --- a/target/linux/uml/patches-5.10/102-pseudo-random-mac.patch +++ /dev/null @@ -1,147 +0,0 @@ -=============================================================================== - -This patch makes MAC addresses of network interfaces predictable. In -particular, it adds a small routine that computes MAC addresses of based on -a SHA1 hash of the virtual machine name and interface ID. - -TECHNICAL INFORMATION: - -Applies to vanilla kernel 3.9.4. - -=============================================================================== ---- a/arch/um/drivers/Kconfig -+++ b/arch/um/drivers/Kconfig -@@ -146,6 +146,20 @@ config UML_NET - enable at least one of the following transport options to actually - make use of UML networking. - -+config UML_NET_DETERMINISTIC_MAC -+ bool "Use deterministic MAC addresses for network interfaces" -+ default y -+ depends on UML_NET -+ select CRYPTO_SHA1 -+ help -+ Virtual network devices inside a User-Mode Linux instance must be -+ assigned a MAC (Ethernet) address. If none is specified on the UML -+ command line, one must be automatically computed. If this option is -+ enabled, a randomly generated address is used. Otherwise, if this -+ option is disabled, the address is generated from a SHA1 hash of -+ the umid of the UML instance and the interface name. The latter choice -+ is useful to make MAC addresses predictable. -+ - config UML_NET_ETHERTAP - bool "Ethertap transport (obsolete)" - depends on UML_NET ---- a/arch/um/drivers/net_kern.c -+++ b/arch/um/drivers/net_kern.c -@@ -25,6 +25,14 @@ - #include <net_kern.h> - #include <net_user.h> - -+#include <crypto/sha.h> -+#include <crypto/hash.h> -+#include <linux/string.h> -+#include <linux/crypto.h> -+#include <linux/err.h> -+#include <linux/scatterlist.h> -+#include "os.h" -+ - #define DRIVER_NAME "uml-netdev" - - static DEFINE_SPINLOCK(opened_lock); -@@ -274,9 +282,51 @@ static const struct ethtool_ops uml_net_ - .get_ts_info = ethtool_op_get_ts_info, - }; - -+#ifdef CONFIG_UML_NET_DETERMINISTIC_MAC -+ -+/* Compute a SHA1 hash of the UML instance's id and -+ * * an interface name. */ -+static int compute_hash(const char *umid, const char *ifname, char *hash) -+{ -+ struct ahash_request *desc; -+ struct crypto_ahash *tfm; -+ struct scatterlist sg; -+ char vmif[1024]; -+ int ret; -+ -+ strcpy (vmif, umid); -+ strcat (vmif, ifname); -+ -+ tfm = crypto_alloc_ahash("sha1", 0, CRYPTO_ALG_ASYNC); -+ if (IS_ERR(tfm)) -+ return -ENOMEM; -+ -+ desc = ahash_request_alloc(tfm, GFP_KERNEL); -+ if (!desc) { -+ ret = -ENOMEM; -+ goto out; -+ } -+ -+ crypto_ahash_clear_flags(tfm, ~0); -+ -+ sg_init_table(&sg, 1); -+ sg_set_buf(&sg, vmif, strlen(vmif)); -+ -+ ahash_request_set_crypt(desc, &sg, hash, strlen(vmif)); -+ -+ ret = crypto_ahash_digest(desc); -+out: -+ crypto_free_ahash(tfm); -+ -+ return ret; -+} -+ -+#endif -+ - void uml_net_setup_etheraddr(struct net_device *dev, char *str) - { - unsigned char *addr = dev->dev_addr; -+ u8 hash[SHA1_DIGEST_SIZE]; - char *end; - int i; - -@@ -319,9 +369,26 @@ void uml_net_setup_etheraddr(struct net_ - return; - - random: -+#ifndef CONFIG_UML_NET_DETERMINISTIC_MAC - printk(KERN_INFO - "Choosing a random ethernet address for device %s\n", dev->name); - eth_hw_addr_random(dev); -+#else -+ printk(KERN_INFO -+ "Computing a digest to use as ethernet address for device %s\n", dev->name); -+ if (compute_hash(get_umid(), dev->name, hash) < 0) { -+ printk(KERN_WARNING -+ "Could not compute digest to use as ethernet address for device %s. " -+ "Using random address instead.\n", dev->name); -+ random_ether_addr(addr); -+ } -+ else { -+ for (i=0; i < 6; i++) -+ addr[i] = (hash[i] + hash[i+6]) % 0x100; -+ } -+ addr [0] &= 0xfe; /* clear multicast bit */ -+ addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ -+#endif - } - - static DEFINE_SPINLOCK(devices_lock); ---- a/kernel/umh.c -+++ b/kernel/umh.c -@@ -354,12 +354,12 @@ static void helper_unlock(void) - } - - int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, -- struct file **filp) -+ struct file **filp) - { - struct file *f[2]; - - if (create_pipe_files(f, 0) < 0) -- return PTR_ERR(f); -+ return PTR_ERR(f); - - sub_info->stdout = f[1]; - *filp = f[0]; |