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Commit 2cf0c8b3 authored by Phil Sutter's avatar Phil Sutter Committed by Pablo Neira Ayuso
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netlink: Introduce nla_strdup() 



This is similar to strdup() for netlink string attributes.

Signed-off-by: default avatarPhil Sutter <phil@nwl.cc>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 6e692678

include/net/netlink.h

+1 −0
Original line number Diff line number Diff line
@@ -247,6 +247,7 @@ int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 
int nla_policy_len(const struct nla_policy *, int);

struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype);

size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize);

char *nla_strdup(const struct nlattr *nla, gfp_t flags);

int nla_memcpy(void *dest, const struct nlattr *src, int count);

int nla_memcmp(const struct nlattr *nla, const void *data, size_t size);

int nla_strcmp(const struct nlattr *nla, const char *str);

lib/nlattr.c

+24 −0
Original line number Diff line number Diff line
@@ -271,6 +271,30 @@ size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize) 
}

EXPORT_SYMBOL(nla_strlcpy);



/**

 * nla_strdup - Copy string attribute payload into a newly allocated buffer

 * @nla: attribute to copy the string from

 * @flags: the type of memory to allocate (see kmalloc).

 *

 * Returns a pointer to the allocated buffer or NULL on error.

 */

char *nla_strdup(const struct nlattr *nla, gfp_t flags)

{

	size_t srclen = nla_len(nla);

	char *src = nla_data(nla), *dst;



	if (srclen > 0 && src[srclen - 1] == '\0')

		srclen--;



	dst = kmalloc(srclen + 1, flags);

	if (dst != NULL) {

		memcpy(dst, src, srclen);

		dst[srclen] = '\0';

	}

	return dst;

}

EXPORT_SYMBOL(nla_strdup);



/**

 * nla_memcpy - Copy a netlink attribute into another memory area

 * @dest: where to copy to memcpy