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Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c83
1 files changed, 44 insertions, 39 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 34c3a43a9c98..7f065a68664e 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -624,6 +624,49 @@ Eaddrnotavail:
return -EADDRNOTAVAIL;
}
+static int do_mcast_group_source(struct sock *sk, int optname,
+ struct group_source_req *greqs)
+{
+ struct ip_mreq_source mreqs;
+ struct sockaddr_in *psin;
+ int omode, add, err;
+
+ if (greqs->gsr_group.ss_family != AF_INET ||
+ greqs->gsr_source.ss_family != AF_INET)
+ return -EADDRNOTAVAIL;
+
+ psin = (struct sockaddr_in *)&greqs->gsr_group;
+ mreqs.imr_multiaddr = psin->sin_addr.s_addr;
+ psin = (struct sockaddr_in *)&greqs->gsr_source;
+ mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
+ mreqs.imr_interface = 0; /* use index for mc_source */
+
+ if (optname == MCAST_BLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 1;
+ } else if (optname == MCAST_UNBLOCK_SOURCE) {
+ omode = MCAST_EXCLUDE;
+ add = 0;
+ } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
+ struct ip_mreqn mreq;
+
+ psin = (struct sockaddr_in *)&greqs->gsr_group;
+ mreq.imr_multiaddr = psin->sin_addr;
+ mreq.imr_address.s_addr = 0;
+ mreq.imr_ifindex = greqs->gsr_interface;
+ err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
+ if (err && err != -EADDRINUSE)
+ return err;
+ greqs->gsr_interface = mreq.imr_ifindex;
+ omode = MCAST_INCLUDE;
+ add = 1;
+ } else /* MCAST_LEAVE_SOURCE_GROUP */ {
+ omode = MCAST_INCLUDE;
+ add = 0;
+ }
+ return ip_mc_source(add, omode, sk, &mreqs, greqs->gsr_interface);
+}
+
static int do_ip_setsockopt(struct sock *sk, int level,
int optname, char __user *optval, unsigned int optlen)
{
@@ -1066,9 +1109,6 @@ static int do_ip_setsockopt(struct sock *sk, int level,
case MCAST_UNBLOCK_SOURCE:
{
struct group_source_req greqs;
- struct ip_mreq_source mreqs;
- struct sockaddr_in *psin;
- int omode, add;
if (optlen != sizeof(struct group_source_req))
goto e_inval;
@@ -1076,42 +1116,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = -EFAULT;
break;
}
- if (greqs.gsr_group.ss_family != AF_INET ||
- greqs.gsr_source.ss_family != AF_INET) {
- err = -EADDRNOTAVAIL;
- break;
- }
- psin = (struct sockaddr_in *)&greqs.gsr_group;
- mreqs.imr_multiaddr = psin->sin_addr.s_addr;
- psin = (struct sockaddr_in *)&greqs.gsr_source;
- mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
- mreqs.imr_interface = 0; /* use index for mc_source */
-
- if (optname == MCAST_BLOCK_SOURCE) {
- omode = MCAST_EXCLUDE;
- add = 1;
- } else if (optname == MCAST_UNBLOCK_SOURCE) {
- omode = MCAST_EXCLUDE;
- add = 0;
- } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
- struct ip_mreqn mreq;
-
- psin = (struct sockaddr_in *)&greqs.gsr_group;
- mreq.imr_multiaddr = psin->sin_addr;
- mreq.imr_address.s_addr = 0;
- mreq.imr_ifindex = greqs.gsr_interface;
- err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
- if (err && err != -EADDRINUSE)
- break;
- greqs.gsr_interface = mreq.imr_ifindex;
- omode = MCAST_INCLUDE;
- add = 1;
- } else /* MCAST_LEAVE_SOURCE_GROUP */ {
- omode = MCAST_INCLUDE;
- add = 0;
- }
- err = ip_mc_source(add, omode, sk, &mreqs,
- greqs.gsr_interface);
+ err = do_mcast_group_source(sk, optname, &greqs);
break;
}
case MCAST_MSFILTER:
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-23 01:40:22 +0000
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// SPDX-License-Identifier: GPL-2.0-or-later
/* System hash blacklist.
 *
 * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#define pr_fmt(fmt) "blacklist: "fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/key.h>
#include <linux/key-type.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <keys/system_keyring.h>
#include "blacklist.h"

static struct key *blacklist_keyring;

/*
 * The description must be a type prefix, a colon and then an even number of
 * hex digits.  The hash is kept in the description.
 */
static int blacklist_vet_description(const char *desc)
{
	int n = 0;

	if (*desc == ':')
		return -EINVAL;
	for (; *desc; desc++)
		if (*desc == ':')
			goto found_colon;
	return -EINVAL;

found_colon:
	desc++;
	for (; *desc; desc++) {
		if (!isxdigit(*desc))
			return -EINVAL;
		n++;
	}

	if (n == 0 || n & 1)
		return -EINVAL;
	return 0;
}

/*
 * The hash to be blacklisted is expected to be in the description.  There will
 * be no payload.
 */
static int blacklist_preparse(struct key_preparsed_payload *prep)
{
	if (prep->datalen > 0)
		return -EINVAL;
	return 0;
}

static void blacklist_free_preparse(struct key_preparsed_payload *prep)
{
}

static void blacklist_describe(const struct key *key, struct seq_file *m)
{
	seq_puts(m, key->description);
}

static struct key_type key_type_blacklist = {
	.name			= "blacklist",
	.vet_description	= blacklist_vet_description,
	.preparse		= blacklist_preparse,
	.free_preparse		= blacklist_free_preparse,
	.instantiate		= generic_key_instantiate,
	.describe		= blacklist_describe,
};

/**
 * mark_hash_blacklisted - Add a hash to the system blacklist
 * @hash - The hash as a hex string with a type prefix (eg. "tbs:23aa429783")
 */
int mark_hash_blacklisted(const char *hash)
{
	key_ref_t key;

	key = key_create_or_update(make_key_ref(blacklist_keyring, true),
				   "blacklist",
				   hash,
				   NULL,
				   0,
				   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
				    KEY_USR_VIEW),
				   KEY_ALLOC_NOT_IN_QUOTA |
				   KEY_ALLOC_BUILT_IN);
	if (IS_ERR(key)) {
		pr_err("Problem blacklisting hash (%ld)\n", PTR_ERR(key));
		return PTR_ERR(key);
	}
	return 0;
}

/**
 * is_hash_blacklisted - Determine if a hash is blacklisted
 * @hash: The hash to be checked as a binary blob
 * @hash_len: The length of the binary hash
 * @type: Type of hash
 */
int is_hash_blacklisted(const u8 *hash, size_t hash_len, const char *type)
{
	key_ref_t kref;
	size_t type_len = strlen(type);
	char *buffer, *p;
	int ret = 0;

	buffer = kmalloc(type_len + 1 + hash_len * 2 + 1, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;
	p = memcpy(buffer, type, type_len);
	p += type_len;
	*p++ = ':';
	bin2hex(p, hash, hash_len);
	p += hash_len * 2;
	*p = 0;

	kref = keyring_search(make_key_ref(blacklist_keyring, true),
			      &key_type_blacklist, buffer, false);
	if (!IS_ERR(kref)) {
		key_ref_put(kref);
		ret = -EKEYREJECTED;
	}

	kfree(buffer);
	return ret;
}
EXPORT_SYMBOL_GPL(is_hash_blacklisted);

int is_binary_blacklisted(const u8 *hash, size_t hash_len)
{
	if (is_hash_blacklisted(hash, hash_len, "bin") == -EKEYREJECTED)
		return -EPERM;

	return 0;
}
EXPORT_SYMBOL_GPL(is_binary_blacklisted);

/*
 * Initialise the blacklist
 */
static int __init blacklist_init(void)
{
	const char *const *bl;

	if (register_key_type(&key_type_blacklist) < 0)
		panic("Can't allocate system blacklist key type\n");

	blacklist_keyring =
		keyring_alloc(".blacklist",
			      KUIDT_INIT(0), KGIDT_INIT(0),
			      current_cred(),
			      (KEY_POS_ALL & ~KEY_POS_SETATTR) |
			      KEY_USR_VIEW | KEY_USR_READ |
			      KEY_USR_SEARCH,
			      KEY_ALLOC_NOT_IN_QUOTA |
			      KEY_FLAG_KEEP,
			      NULL, NULL);
	if (IS_ERR(blacklist_keyring))
		panic("Can't allocate system blacklist keyring\n");

	for (bl = blacklist_hashes; *bl; bl++)
		if (mark_hash_blacklisted(*bl) < 0)
			pr_err("- blacklisting failed\n");
	return 0;
}

/*
 * Must be initialised before we try and load the keys into the keyring.
 */
device_initcall(blacklist_init);