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cifs: have cifs parse scope_id out of IPv6 addresses and use it

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This patch has CIFS look for a '%' in an IPv6 address. If one is
present then it will try to treat that value as a numeric interface
index suitable for stuffing into the sin6_scope_id field.

This should allow people to mount servers on IPv6 link-local addresses.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: David Holder <david@erion.co.uk>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton
2009-06-11 10:27:31 -04:00
committed by Steve French
parent 268875b9d1
commit 681bf72e48
3 changed files with 33 additions and 9 deletions
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32
fs/cifs/netmisc.c
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@@ -158,25 +158,47 @@ cifs_inet_pton(const int address_family, const char *cp, void *dst)
/*
* Try to convert a string to an IPv4 address and then attempt to convert
* it to an IPv6 address if that fails. Set the family field if either
* succeeds.
* succeeds. If it's an IPv6 address and it has a '%' sign in it, try to
* treat the part following it as a numeric sin6_scope_id.
*
* Returns 0 on failure.
*/
int
cifs_convert_address(char *src, void *dst)
{
int rc;
char *pct, *endp;
struct sockaddr_in *s4 = (struct sockaddr_in *) dst;
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) dst;
/* IPv4 address */
if (cifs_inet_pton(AF_INET, src, &s4->sin_addr.s_addr)) {
s4->sin_family = AF_INET;
return 1;
} else if (cifs_inet_pton(AF_INET6, src, &s6->sin6_addr.s6_addr)) {
s6->sin6_family = AF_INET6;
return 1;
}
return 0;
/* temporarily terminate string */
pct = strchr(src, '%');
if (pct)
*pct = '\0';
rc = cifs_inet_pton(AF_INET6, src, &s6->sin6_addr.s6_addr);
/* repair temp termination (if any) and make pct point to scopeid */
if (pct)
*pct++ = '%';
if (!rc)
return rc;
s6->sin6_family = AF_INET6;
if (pct) {
s6->sin6_scope_id = (u32) simple_strtoul(pct, &endp, 0);
if (!*pct || *endp)
return 0;
}
return rc;
}
/*****************************************************************************