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author | David Howells <dhowells@redhat.com> | 2023-10-19 12:55:11 +0100 |
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committer | David Howells <dhowells@redhat.com> | 2023-12-24 15:22:50 +0000 |
commit | 72904d7b9bfbf2dd146254edea93958bc35bbbfe (patch) | |
tree | a9197b28592603c4805f30965322f6fc6cfd2fb7 /net/rxrpc/af_rxrpc.c | |
parent | 07f3502b33a260f873e35708d2fa693eb52225cb (diff) | |
download | linux-72904d7b9bfbf2dd146254edea93958bc35bbbfe.tar.gz linux-72904d7b9bfbf2dd146254edea93958bc35bbbfe.tar.bz2 linux-72904d7b9bfbf2dd146254edea93958bc35bbbfe.zip |
rxrpc, afs: Allow afs to pin rxrpc_peer objects
Change rxrpc's API such that:
(1) A new function, rxrpc_kernel_lookup_peer(), is provided to look up an
rxrpc_peer record for a remote address and a corresponding function,
rxrpc_kernel_put_peer(), is provided to dispose of it again.
(2) When setting up a call, the rxrpc_peer object used during a call is
now passed in rather than being set up by rxrpc_connect_call(). For
afs, this meenat passing it to rxrpc_kernel_begin_call() rather than
the full address (the service ID then has to be passed in as a
separate parameter).
(3) A new function, rxrpc_kernel_remote_addr(), is added so that afs can
get a pointer to the transport address for display purposed, and
another, rxrpc_kernel_remote_srx(), to gain a pointer to the full
rxrpc address.
(4) The function to retrieve the RTT from a call, rxrpc_kernel_get_srtt(),
is then altered to take a peer. This now returns the RTT or -1 if
there are insufficient samples.
(5) Rename rxrpc_kernel_get_peer() to rxrpc_kernel_call_get_peer().
(6) Provide a new function, rxrpc_kernel_get_peer(), to get a ref on a
peer the caller already has.
This allows the afs filesystem to pin the rxrpc_peer records that it is
using, allowing faster lookups and pointer comparisons rather than
comparing sockaddr_rxrpc contents. It also makes it easier to get hold of
the RTT. The following changes are made to afs:
(1) The addr_list struct's addrs[] elements now hold a peer struct pointer
and a service ID rather than a sockaddr_rxrpc.
(2) When displaying the transport address, rxrpc_kernel_remote_addr() is
used.
(3) The port arg is removed from afs_alloc_addrlist() since it's always
overridden.
(4) afs_merge_fs_addr4() and afs_merge_fs_addr6() do peer lookup and may
now return an error that must be handled.
(5) afs_find_server() now takes a peer pointer to specify the address.
(6) afs_find_server(), afs_compare_fs_alists() and afs_merge_fs_addr[46]{}
now do peer pointer comparison rather than address comparison.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Diffstat (limited to 'net/rxrpc/af_rxrpc.c')
-rw-r--r-- | net/rxrpc/af_rxrpc.c | 62 |
1 files changed, 54 insertions, 8 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c index fa8aec78f63d..465bfe5eb061 100644 --- a/net/rxrpc/af_rxrpc.c +++ b/net/rxrpc/af_rxrpc.c @@ -259,15 +259,61 @@ static int rxrpc_listen(struct socket *sock, int backlog) } /** + * rxrpc_kernel_lookup_peer - Obtain remote transport endpoint for an address + * @sock: The socket through which it will be accessed + * @srx: The network address + * @gfp: Allocation flags + * + * Lookup or create a remote transport endpoint record for the specified + * address and return it with a ref held. + */ +struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock, + struct sockaddr_rxrpc *srx, gfp_t gfp) +{ + struct rxrpc_sock *rx = rxrpc_sk(sock->sk); + int ret; + + ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); + if (ret < 0) + return ERR_PTR(ret); + + return rxrpc_lookup_peer(rx->local, srx, gfp); +} +EXPORT_SYMBOL(rxrpc_kernel_lookup_peer); + +/** + * rxrpc_kernel_get_peer - Get a reference on a peer + * @peer: The peer to get a reference on. + * + * Get a record for the remote peer in a call. + */ +struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer) +{ + return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL; +} +EXPORT_SYMBOL(rxrpc_kernel_get_peer); + +/** + * rxrpc_kernel_put_peer - Allow a kernel app to drop a peer reference + * @peer: The peer to drop a ref on + */ +void rxrpc_kernel_put_peer(struct rxrpc_peer *peer) +{ + rxrpc_put_peer(peer, rxrpc_peer_put_application); +} +EXPORT_SYMBOL(rxrpc_kernel_put_peer); + +/** * rxrpc_kernel_begin_call - Allow a kernel service to begin a call * @sock: The socket on which to make the call - * @srx: The address of the peer to contact + * @peer: The peer to contact * @key: The security context to use (defaults to socket setting) * @user_call_ID: The ID to use * @tx_total_len: Total length of data to transmit during the call (or -1) * @hard_timeout: The maximum lifespan of the call in sec * @gfp: The allocation constraints * @notify_rx: Where to send notifications instead of socket queue + * @service_id: The ID of the service to contact * @upgrade: Request service upgrade for call * @interruptibility: The call is interruptible, or can be canceled. * @debug_id: The debug ID for tracing to be assigned to the call @@ -280,13 +326,14 @@ static int rxrpc_listen(struct socket *sock, int backlog) * supplying @srx and @key. */ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, - struct sockaddr_rxrpc *srx, + struct rxrpc_peer *peer, struct key *key, unsigned long user_call_ID, s64 tx_total_len, u32 hard_timeout, gfp_t gfp, rxrpc_notify_rx_t notify_rx, + u16 service_id, bool upgrade, enum rxrpc_interruptibility interruptibility, unsigned int debug_id) @@ -295,13 +342,11 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, struct rxrpc_call_params p; struct rxrpc_call *call; struct rxrpc_sock *rx = rxrpc_sk(sock->sk); - int ret; _enter(",,%x,%lx", key_serial(key), user_call_ID); - ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); - if (ret < 0) - return ERR_PTR(ret); + if (WARN_ON_ONCE(peer->local != rx->local)) + return ERR_PTR(-EIO); lock_sock(&rx->sk); @@ -319,12 +364,13 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, memset(&cp, 0, sizeof(cp)); cp.local = rx->local; + cp.peer = peer; cp.key = key; cp.security_level = rx->min_sec_level; cp.exclusive = false; cp.upgrade = upgrade; - cp.service_id = srx->srx_service; - call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp, debug_id); + cp.service_id = service_id; + call = rxrpc_new_client_call(rx, &cp, &p, gfp, debug_id); /* The socket has been unlocked. */ if (!IS_ERR(call)) { call->notify_rx = notify_rx; |