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author | J. Bruce Fields <bfields@redhat.com> | 2012-05-03 15:06:21 -0400 |
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committer | Steve Dickson <steved@redhat.com> | 2012-05-03 15:12:10 -0400 |
commit | c2544b77566690ebec32a2d47c9249548b1a0941 (patch) | |
tree | ee5ad75e30a6036194e6c5735a046587e1d3e005 /utils/mountd/auth.c | |
parent | 236025253c6ec534cd816390464435ec18c499f7 (diff) | |
download | nfs-utils-c2544b77566690ebec32a2d47c9249548b1a0941.tar.gz nfs-utils-c2544b77566690ebec32a2d47c9249548b1a0941.tar.xz nfs-utils-c2544b77566690ebec32a2d47c9249548b1a0941.zip |
mountd: prepend '$' to make use_ipaddr clients self-describing
From: "J. Bruce Fields" <bfields@redhat.com>
Mountd is responsible for filling three interrelated kernel caches:
- auth_unix_ip maps an incoming ip addresses to a "domain".
- nfsd_fh maps (domain, filehandle-fragment) pairs to paths.
- nfsd_export maps (domain, path) pairs to export options.
Note that each export is assocated with a "client" string--the part
before the parentheses in an /etc/export line--which may be a domain
name, a netgroup, etc.
The "domain" string in the above three caches may be either:
- in the !use_ipaddr case, a comma-separated list of client
strings.
- in the use_ipaddr case, an ip address.
In the former case, mountd does the hard work of matching an ip address
to the clients when doing the auth_unix_ip mapping. In the latter case,
it delays that until the nfsd_fh or nfsd_export upcall.
We're currently depending on being able to flush the kernel caches
completely when switching between the use_ipaddr and !use_ipaddr cases.
However, the kernel's cache-flushing doesn't really provide reliable
guarantees on return; it's still possible we could see nfsd_fh or
nfsd_export upcalls with the old domain-type after flushing.
So, instead, make the two domain types self-describing by prepending a
"$" in the use_ipaddr case.
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>
Diffstat (limited to 'utils/mountd/auth.c')
-rw-r--r-- | utils/mountd/auth.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/utils/mountd/auth.c b/utils/mountd/auth.c index 688bf78..508040a 100644 --- a/utils/mountd/auth.c +++ b/utils/mountd/auth.c @@ -112,15 +112,23 @@ auth_reload() return counter; } +static char *get_client_ipaddr_name(const struct sockaddr *caller) +{ + char buf[INET6_ADDRSTRLEN + 1]; + + buf[0] = '$'; + host_ntop(caller, buf + 1, sizeof(buf) - 1); + return strdup(buf); +} + static char * get_client_hostname(const struct sockaddr *caller, struct addrinfo *ai, enum auth_error *error) { - char buf[INET6_ADDRSTRLEN]; char *n; if (use_ipaddr) - return strdup(host_ntop(caller, buf, sizeof(buf))); + return get_client_ipaddr_name(caller); n = client_compose(ai); *error = unknown_host; if (!n) @@ -143,7 +151,7 @@ bool namelist_client_matches(nfs_export *exp, char *dom) bool client_matches(nfs_export *exp, char *dom, struct addrinfo *ai) { - if (use_ipaddr) + if (is_ipaddr_client(dom)) return ipaddr_client_matches(exp, ai); return namelist_client_matches(exp, dom); } |