From 39be4502cb75dc26007fe1659735b26c8e63fcc6 Mon Sep 17 00:00:00 2001 From: Olaf Kirch Date: Wed, 4 Oct 2006 02:16:03 -0700 Subject: [PATCH] [PATCH] knfsd: match GRANTED_RES replies using cookies When we send a GRANTED_MSG call, we current copy the NLM cookie provided in the original LOCK call - because in 1996, some broken clients seemed to rely on this bug. However, this means the cookies are not unique, so that when the client's GRANTED_RES message comes back, we cannot simply match it based on the cookie, but have to use the client's IP address in addition. Which breaks when you have a multi-homed NFS client. The X/Open spec explicitly mentions that clients should not expect the same cookie; so one may hope that any clients that were broken in 1996 have either been fixed or rendered obsolete. Signed-off-by: Olaf Kirch Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/lockd/svc4proc.c | 2 +- fs/lockd/svclock.c | 24 +++++++++++++----------- fs/lockd/svcproc.c | 2 +- include/linux/lockd/lockd.h | 2 +- 4 files changed, 16 insertions(+), 14 deletions(-) diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c index b8525fb6293..fa370f6eb07 100644 --- a/fs/lockd/svc4proc.c +++ b/fs/lockd/svc4proc.c @@ -455,7 +455,7 @@ nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, dprintk("lockd: GRANTED_RES called\n"); - nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); + nlmsvc_grant_reply(&argp->cookie, argp->status); return rpc_success; } diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index 1f91567a1b8..3d2b8a831be 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -139,19 +139,19 @@ static inline int nlm_cookie_match(struct nlm_cookie *a, struct nlm_cookie *b) * Find a block with a given NLM cookie. */ static inline struct nlm_block * -nlmsvc_find_block(struct nlm_cookie *cookie, struct sockaddr_in *sin) +nlmsvc_find_block(struct nlm_cookie *cookie) { struct nlm_block *block; list_for_each_entry(block, &nlm_blocked, b_list) { - if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie) - && nlm_cmp_addr(sin, &block->b_host->h_addr)) + if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie)) goto found; } return NULL; found: + dprintk("nlmsvc_find_block(%s): block=%p\n", nlmdbg_cookie2a(cookie), block); kref_get(&block->b_count); return block; } @@ -165,6 +165,11 @@ found: * request, but (as I found out later) that's because some implementations * do just this. Never mind the standards comittees, they support our * logging industries. + * + * 10 years later: I hope we can safely ignore these old and broken + * clients by now. Let's fix this so we can uniquely identify an incoming + * GRANTED_RES message by cookie, without having to rely on the client's IP + * address. --okir */ static inline struct nlm_block * nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file, @@ -197,7 +202,7 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file, /* Set notifier function for VFS, and init args */ call->a_args.lock.fl.fl_flags |= FL_SLEEP; call->a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations; - call->a_args.cookie = *cookie; /* see above */ + nlmclnt_next_cookie(&call->a_args.cookie); dprintk("lockd: created block %p...\n", block); @@ -640,17 +645,14 @@ static const struct rpc_call_ops nlmsvc_grant_ops = { * block. */ void -nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status) +nlmsvc_grant_reply(struct nlm_cookie *cookie, u32 status) { struct nlm_block *block; - struct nlm_file *file; - dprintk("grant_reply: looking for cookie %x, host (%08x), s=%d \n", - *(unsigned int *)(cookie->data), - ntohl(rqstp->rq_addr.sin_addr.s_addr), status); - if (!(block = nlmsvc_find_block(cookie, &rqstp->rq_addr))) + dprintk("grant_reply: looking for cookie %x, s=%d \n", + *(unsigned int *)(cookie->data), status); + if (!(block = nlmsvc_find_block(cookie))) return; - file = block->b_file; if (block) { if (status == NLM_LCK_DENIED_GRACE_PERIOD) { diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c index 66e7b0b3430..75b2c81bcb9 100644 --- a/fs/lockd/svcproc.c +++ b/fs/lockd/svcproc.c @@ -484,7 +484,7 @@ nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, dprintk("lockd: GRANTED_RES called\n"); - nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); + nlmsvc_grant_reply(&argp->cookie, argp->status); return rpc_success; } diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index a345650e562..5920ecaeed6 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -193,7 +193,7 @@ u32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *); unsigned long nlmsvc_retry_blocked(void); void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *, nlm_host_match_fn_t match); -void nlmsvc_grant_reply(struct svc_rqst *, struct nlm_cookie *, u32); +void nlmsvc_grant_reply(struct nlm_cookie *, u32); /* * File handling for the server personality -- 2.20.1