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nfsd: add IPv6 addr escaping to fs_location hosts 

The fs_location->hosts list is split on colons, but this doesn't work when
IPv6 addresses are used (they contain colons).
This patch adds the function nfsd4_encode_components_esc() to
allow the caller to specify escape characters when splitting on 'sep'.
In order to fix referrals, this patch must be used with the mountd patch
that similarly fixes IPv6 [] escaping.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Weston Andros Adamson 2012-04-24 11:07:59 -04:00 committed by J. Bruce Fields
parent 45eaa1c1a1
commit e7a0444aef
1 changed files with 33 additions and 7 deletions
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40
fs/nfsd/nfs4xdr.c
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@ -1744,15 +1744,16 @@ static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, _
}
/* Encode as an array of strings the string given with components
* separated @sep.
* separated @sep, escaped with esc_enter and esc_exit.
*/
static __be32 nfsd4_encode_components(char sep, char *components,
__be32 **pp, int *buflen)
static __be32 nfsd4_encode_components_esc(char sep, char *components,
__be32 **pp, int *buflen,
char esc_enter, char esc_exit)
{
__be32 *p = *pp;
__be32 *countp = p;
int strlen, count=0;
char *str, *end;
char *str, *end, *next;
dprintk("nfsd4_encode_components(%s)\n", components);
if ((*buflen -= 4) < 0)
@ -1760,8 +1761,23 @@ static __be32 nfsd4_encode_components(char sep, char *components,
WRITE32(0); /* We will fill this in with @count later */
end = str = components;
while (*end) {
for (; *end && (*end != sep); end++)
; /* Point to end of component */
bool found_esc = false;
/* try to parse as esc_start, ..., esc_end, sep */
if (*str == esc_enter) {
for (; *end && (*end != esc_exit); end++)
/* find esc_exit or end of string */;
next = end + 1;
if (*end && (!*next || *next == sep)) {
str++;
found_esc = true;
}
}
if (!found_esc)
for (; *end && (*end != sep); end++)
/* find sep or end of string */;
strlen = end - str;
if (strlen) {
if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
@ -1780,6 +1796,15 @@ static __be32 nfsd4_encode_components(char sep, char *components,
return 0;
}
/* Encode as an array of strings the string given with components
* separated @sep.
*/
static __be32 nfsd4_encode_components(char sep, char *components,
__be32 **pp, int *buflen)
{
return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
}
/*
* encode a location element of a fs_locations structure
*/
@ -1789,7 +1814,8 @@ static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
__be32 status;
__be32 *p = *pp;
status = nfsd4_encode_components(':', location->hosts, &p, buflen);
status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
'[', ']');
if (status)
return status;
status = nfsd4_encode_components('/', location->path, &p, buflen);