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nfs4: fix referrals on mounts that use IPv6 addrs 

All referrals (IPv4 addr, IPv6 addr, and DNS) are broken on mounts of
IPv6 addresses, because validation code uses a path that is parsed
from the dev_name ("<server>:<path>") by splitting on the first colon and
colons are used in IPv6 addrs.
This patch ignores colons within IPv6 addresses that are escaped by '[' and ']'.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Weston Andros Adamson 2012-04-24 16:50:37 -04:00 committed by Trond Myklebust
parent 2300fd67b4
commit 1aba156763
1 changed files with 27 additions and 3 deletions
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30
fs/nfs/nfs4namespace.c
View File

@ -51,6 +51,30 @@ Elong:
return ERR_PTR(-ENAMETOOLONG);
}
/*
* return the path component of "<server>:<path>"
* nfspath - the "<server>:<path>" string
* end - one past the last char that could contain "<server>:"
* returns NULL on failure
*/
static char *nfs_path_component(const char *nfspath, const char *end)
{
char *p;
if (*nfspath == '[') {
/* parse [] escaped IPv6 addrs */
p = strchr(nfspath, ']');
if (p != NULL && ++p < end && *p == ':')
return p + 1;
} else {
/* otherwise split on first colon */
p = strchr(nfspath, ':');
if (p != NULL && p < end)
return p + 1;
}
return NULL;
}
/*
* Determine the mount path as a string
*/
@ -59,9 +83,9 @@ static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen)
char *limit;
char *path = nfs_path(&limit, dentry, buffer, buflen);
if (!IS_ERR(path)) {
char *colon = strchr(path, ':');
if (colon && colon < limit)
path = colon + 1;
char *path_component = nfs_path_component(path, limit);
if (path_component)
return path_component;
}
return path;
}