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Code Issues Releases Wiki Activity

xt_SYSRQ: make new code compile for kernel <= 2.6.23

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This commit is contained in:
Jan Engelhardt
2008-12-10 15:45:43 +01:00
parent 94ecf3847b
commit 6b37f201d7
1 changed files with 42 additions and 0 deletions
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42
extensions/xt_SYSRQ.c
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@@ -38,6 +38,7 @@ MODULE_PARM_DESC(hash, "hash algorithm, default sha1");
MODULE_PARM_DESC(seqno, "sequence number for remote sysrq");
MODULE_PARM_DESC(debug, "debugging: 0=off, 1=on");
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
static struct crypto_hash *tfm;
static int digestsize;
static unsigned char *digest_password;
@@ -108,7 +109,9 @@ static unsigned int sysrq_tg(const void *pdata, uint16_t len)
ret = crypto_hash_init(&desc);
if (ret != 0)
goto hash_fail;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24)
sg_init_table(sg, 2);
#endif
sg_set_buf(&sg[0], data, n);
strcpy(digest_password, sysrq_password);
i = strlen(digest_password);
@@ -153,6 +156,37 @@ static unsigned int sysrq_tg(const void *pdata, uint16_t len)
printk(KERN_WARNING KBUILD_MODNAME ": digest failure\n");
return NF_DROP;
}
#else
static unsigned int sysrq_tg(const void *pdata, uint16_t len)
{
const char *data = pdata;
char c;
if (*sysrq_password == '\0') {
if (!sysrq_once)
printk(KERN_INFO KBUILD_MODNAME "No password set\n");
sysrq_once = true;
return NF_DROP;
}
if (len == 0)
return NF_DROP;
c = *data;
if (strncmp(&data[1], sysrq_password, len - 1) != 0) {
printk(KERN_INFO KBUILD_MODNAME "Failed attempt - "
"password mismatch\n");
return NF_DROP;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
handle_sysrq(c, NULL);
#else
handle_sysrq(c, NULL, NULL);
#endif
return NF_ACCEPT;
}
#endif
static unsigned int
sysrq_tg4(struct sk_buff **pskb, const struct xt_target_param *par)
@@ -202,6 +236,7 @@ sysrq_tg6(struct sk_buff **pskb, const struct xt_target_param *par)
static bool sysrq_tg_check(const struct xt_tgchk_param *par)
{
if (par->target->family == NFPROTO_IPV4) {
const struct ipt_entry *entry = par->entryinfo;
@@ -246,6 +281,7 @@ static struct xt_target sysrq_tg_reg[] __read_mostly = {
static int __init sysrq_tg_init(void)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
struct timeval now;
tfm = crypto_alloc_hash(sysrq_hash, 0, CRYPTO_ALG_ASYNC);
@@ -289,14 +325,20 @@ static int __init sysrq_tg_init(void)
if (digest_password)
kfree(digest_password);
return -EINVAL;
#else
printk(KERN_WARNING "xt_SYSRQ does not provide crypto for <= 2.6.18\n");
return xt_register_targets(sysrq_tg_reg, ARRAY_SIZE(sysrq_tg_reg));
#endif
}
static void __exit sysrq_tg_exit(void)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
crypto_free_hash(tfm);
kfree(digest);
kfree(hexdigest);
kfree(digest_password);
#endif
return xt_unregister_targets(sysrq_tg_reg, ARRAY_SIZE(sysrq_tg_reg));
}