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rxrpc: Don't expose skbs to in-kernel users [ver #2] 

Don't expose skbs to in-kernel users, such as the AFS filesystem, but
instead provide a notification hook the indicates that a call needs
attention and another that indicates that there's a new call to be
collected.

This makes the following possibilities more achievable:

 (1) Call refcounting can be made simpler if skbs don't hold refs to calls.

 (2) skbs referring to non-data events will be able to be freed much sooner
     rather than being queued for AFS to pick up as rxrpc_kernel_recv_data
     will be able to consult the call state.

 (3) We can shortcut the receive phase when a call is remotely aborted
     because we don't have to go through all the packets to get to the one
     cancelling the operation.

 (4) It makes it easier to do encryption/decryption directly between AFS's
     buffers and sk_buffs.

 (5) Encryption/decryption can more easily be done in the AFS's thread
     contexts - usually that of the userspace process that issued a syscall
     - rather than in one of rxrpc's background threads on a workqueue.

 (6) AFS will be able to wait synchronously on a call inside AF_RXRPC.

To make this work, the following interface function has been added:

     int rxrpc_kernel_recv_data(
		struct socket *sock, struct rxrpc_call *call,
		void *buffer, size_t bufsize, size_t *_offset,
		bool want_more, u32 *_abort_code);

This is the recvmsg equivalent.  It allows the caller to find out about the
state of a specific call and to transfer received data into a buffer
piecemeal.

afs_extract_data() and rxrpc_kernel_recv_data() now do all the extraction
logic between them.  They don't wait synchronously yet because the socket
lock needs to be dealt with.

Five interface functions have been removed:

	rxrpc_kernel_is_data_last()
    	rxrpc_kernel_get_abort_code()
    	rxrpc_kernel_get_error_number()
    	rxrpc_kernel_free_skb()
    	rxrpc_kernel_data_consumed()

As a temporary hack, sk_buffs going to an in-kernel call are queued on the
rxrpc_call struct (->knlrecv_queue) rather than being handed over to the
in-kernel user.  To process the queue internally, a temporary function,
temp_deliver_data() has been added.  This will be replaced with common code
between the rxrpc_recvmsg() path and the kernel_rxrpc_recv_data() path in a
future patch.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Howells 2016-08-30 20:42:14 +01:00 committed by David S. Miller
parent 95ac399451
commit d001648ec7
16 changed files with 566 additions and 587 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
Documentation/networking/rxrpc.txt
View File

@ -748,6 +748,37 @@ The kernel interface functions are as follows:
The msg must not specify a destination address, control data or any flags
other than MSG_MORE. len is the total amount of data to transmit.
(*) Receive data from a call.
int rxrpc_kernel_recv_data(struct socket *sock,
struct rxrpc_call *call,
void *buf,
size_t size,
size_t *_offset,
bool want_more,
u32 *_abort)
This is used to receive data from either the reply part of a client call
or the request part of a service call. buf and size specify how much
data is desired and where to store it. *_offset is added on to buf and
subtracted from size internally; the amount copied into the buffer is
added to *_offset before returning.
want_more should be true if further data will be required after this is
satisfied and false if this is the last item of the receive phase.
There are three normal returns: 0 if the buffer was filled and want_more
was true; 1 if the buffer was filled, the last DATA packet has been
emptied and want_more was false; and -EAGAIN if the function needs to be
called again.
If the last DATA packet is processed but the buffer contains less than
the amount requested, EBADMSG is returned. If want_more wasn't set, but
more data was available, EMSGSIZE is returned.
If a remote ABORT is detected, the abort code received will be stored in
*_abort and ECONNABORTED will be returned.
(*) Abort a call.
void rxrpc_kernel_abort_call(struct socket *sock,
@ -825,47 +856,6 @@ The kernel interface functions are as follows:
Other errors may be returned if the call had been aborted (-ECONNABORTED)
or had timed out (-ETIME).
(*) Record the delivery of a data message.
void rxrpc_kernel_data_consumed(struct rxrpc_call *call,
struct sk_buff *skb);
This is used to record a data message as having been consumed and to
update the ACK state for the call. The message must still be passed to
rxrpc_kernel_free_skb() for disposal by the caller.
(*) Free a message.
void rxrpc_kernel_free_skb(struct sk_buff *skb);
This is used to free a non-DATA socket buffer intercepted from an AF_RXRPC
socket.
(*) Determine if a data message is the last one on a call.
bool rxrpc_kernel_is_data_last(struct sk_buff *skb);
This is used to determine if a socket buffer holds the last data message
to be received for a call (true will be returned if it does, false
if not).
The data message will be part of the reply on a client call and the
request on an incoming call. In the latter case there will be more
messages, but in the former case there will not.
(*) Get the abort code from an abort message.
u32 rxrpc_kernel_get_abort_code(struct sk_buff *skb);
This is used to extract the abort code from a remote abort message.
(*) Get the error number from a local or network error message.
int rxrpc_kernel_get_error_number(struct sk_buff *skb);
This is used to extract the error number from a message indicating either
a local error occurred or a network error occurred.
(*) Allocate a null key for doing anonymous security.
struct key *rxrpc_get_null_key(const char *keyname);

142
fs/afs/cmservice.c
View File

@ -17,15 +17,12 @@
#include "internal.h"
#include "afs_cm.h"
static int afs_deliver_cb_init_call_back_state(struct afs_call *,
struct sk_buff *, bool);
static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
struct sk_buff *, bool);
static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_probe_uuid(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *,
struct sk_buff *, bool);
static int afs_deliver_cb_init_call_back_state(struct afs_call *);
static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
static int afs_deliver_cb_probe(struct afs_call *);
static int afs_deliver_cb_callback(struct afs_call *);
static int afs_deliver_cb_probe_uuid(struct afs_call *);
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
static void afs_cm_destructor(struct afs_call *);
/*
@ -130,7 +127,7 @@ static void afs_cm_destructor(struct afs_call *call)
* received. The step number here must match the final number in
* afs_deliver_cb_callback().
*/
if (call->unmarshall == 6) {
if (call->unmarshall == 5) {
ASSERT(call->server && call->count && call->request);
afs_break_callbacks(call->server, call->count, call->request);
}
@ -164,8 +161,7 @@ static void SRXAFSCB_CallBack(struct work_struct *work)
/*
* deliver request data to a CB.CallBack call
*/
static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
bool last)
static int afs_deliver_cb_callback(struct afs_call *call)
{
struct sockaddr_rxrpc srx;
struct afs_callback *cb;
@ -174,7 +170,7 @@ static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
u32 tmp;
int ret, loop;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
@ -185,7 +181,7 @@ static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
/* extract the FID array and its count in two steps */
case 1:
_debug("extract FID count");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
ret = afs_extract_data(call, &call->tmp, 4, true);
if (ret < 0)
return ret;
@ -202,8 +198,8 @@ static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
case 2:
_debug("extract FID array");
ret = afs_extract_data(call, skb, last, call->buffer,
call->count * 3 * 4);
ret = afs_extract_data(call, call->buffer,
call->count * 3 * 4, true);
if (ret < 0)
return ret;
@ -229,7 +225,7 @@ static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
/* extract the callback array and its count in two steps */
case 3:
_debug("extract CB count");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
ret = afs_extract_data(call, &call->tmp, 4, true);
if (ret < 0)
return ret;
@ -239,13 +235,11 @@ static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
return -EBADMSG;
call->offset = 0;
call->unmarshall++;
if (tmp == 0)
goto empty_cb_array;
case 4:
_debug("extract CB array");
ret = afs_extract_data(call, skb, last, call->request,
call->count * 3 * 4);
ret = afs_extract_data(call, call->buffer,
call->count * 3 * 4, false);
if (ret < 0)
return ret;
@ -258,15 +252,9 @@ static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
cb->type = ntohl(*bp++);
}
empty_cb_array:
call->offset = 0;
call->unmarshall++;
case 5:
ret = afs_data_complete(call, skb, last);
if (ret < 0)
return ret;
/* Record that the message was unmarshalled successfully so
* that the call destructor can know do the callback breaking
* work, even if the final ACK isn't received.
@ -275,7 +263,7 @@ static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
* updated also.
*/
call->unmarshall++;
case 6:
case 5:
break;
}
@ -310,19 +298,17 @@ static void SRXAFSCB_InitCallBackState(struct work_struct *work)
/*
* deliver request data to a CB.InitCallBackState call
*/
static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
struct sk_buff *skb,
bool last)
static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
{
struct sockaddr_rxrpc srx;
struct afs_server *server;
int ret;
_enter(",{%u},%d", skb->len, last);
_enter("");
rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
ret = afs_data_complete(call, skb, last);
ret = afs_extract_data(call, NULL, 0, false);
if (ret < 0)
return ret;
@ -344,21 +330,61 @@ static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
/*
* deliver request data to a CB.InitCallBackState3 call
*/
static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
struct sk_buff *skb,
bool last)
static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
{
struct sockaddr_rxrpc srx;
struct afs_server *server;
struct afs_uuid *r;
unsigned loop;
__be32 *b;
int ret;
_enter(",{%u},%d", skb->len, last);
_enter("");
rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
/* There are some arguments that we ignore */
afs_data_consumed(call, skb);
if (!last)
return -EAGAIN;
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
call->offset = 0;
call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
call->unmarshall++;
case 1:
_debug("extract UUID");
ret = afs_extract_data(call, call->buffer,
11 * sizeof(__be32), false);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}
_debug("unmarshall UUID");
call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
if (!call->request)
return -ENOMEM;
b = call->buffer;
r = call->request;
r->time_low = ntohl(b[0]);
r->time_mid = ntohl(b[1]);
r->time_hi_and_version = ntohl(b[2]);
r->clock_seq_hi_and_reserved = ntohl(b[3]);
r->clock_seq_low = ntohl(b[4]);
for (loop = 0; loop < 6; loop++)
r->node[loop] = ntohl(b[loop + 5]);
call->offset = 0;
call->unmarshall++;
case 2:
break;
}
/* no unmarshalling required */
call->state = AFS_CALL_REPLYING;
@ -390,14 +416,13 @@ static void SRXAFSCB_Probe(struct work_struct *work)
/*
* deliver request data to a CB.Probe call
*/
static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
bool last)
static int afs_deliver_cb_probe(struct afs_call *call)
{
int ret;
_enter(",{%u},%d", skb->len, last);
_enter("");
ret = afs_data_complete(call, skb, last);
ret = afs_extract_data(call, NULL, 0, false);
if (ret < 0)
return ret;
@ -435,19 +460,14 @@ static void SRXAFSCB_ProbeUuid(struct work_struct *work)
/*
* deliver request data to a CB.ProbeUuid call
*/
static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
bool last)
static int afs_deliver_cb_probe_uuid(struct afs_call *call)
{
struct afs_uuid *r;
unsigned loop;
__be32 *b;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
ret = afs_data_complete(call, skb, last);
if (ret < 0)
return ret;
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
@ -459,8 +479,8 @@ static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
case 1:
_debug("extract UUID");
ret = afs_extract_data(call, skb, last, call->buffer,
11 * sizeof(__be32));
ret = afs_extract_data(call, call->buffer,
11 * sizeof(__be32), false);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
@ -487,16 +507,9 @@ static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
call->unmarshall++;
case 2:
_debug("trailer");
if (skb->len != 0)
return -EBADMSG;
break;
}
ret = afs_data_complete(call, skb, last);
if (ret < 0)
return ret;
call->state = AFS_CALL_REPLYING;
INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
@ -570,14 +583,13 @@ static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
/*
* deliver request data to a CB.TellMeAboutYourself call
*/
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
{
int ret;
_enter(",{%u},%d", skb->len, last);
_enter("");
ret = afs_data_complete(call, skb, last);
ret = afs_extract_data(call, NULL, 0, false);
if (ret < 0)
return ret;

148
fs/afs/fsclient.c
View File

@ -235,16 +235,15 @@ static void xdr_decode_AFSFetchVolumeStatus(const __be32 **_bp,
/*
* deliver reply data to an FS.FetchStatus
*/
static int afs_deliver_fs_fetch_status(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_fetch_status(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
int ret;
_enter(",,%u", last);
_enter("");
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -307,8 +306,7 @@ int afs_fs_fetch_file_status(struct afs_server *server,
/*
* deliver reply data to an FS.FetchData
*/
static int afs_deliver_fs_fetch_data(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_fetch_data(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
@ -316,7 +314,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
void *buffer;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
@ -332,7 +330,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
* client) */
case 1:
_debug("extract data length (MSW)");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
ret = afs_extract_data(call, &call->tmp, 4, true);
if (ret < 0)
return ret;
@ -347,7 +345,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
/* extract the returned data length */
case 2:
_debug("extract data length");
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
ret = afs_extract_data(call, &call->tmp, 4, true);
if (ret < 0)
return ret;
@ -363,10 +361,10 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
_debug("extract data");
if (call->count > 0) {
page = call->reply3;
buffer = kmap_atomic(page);
ret = afs_extract_data(call, skb, last, buffer,
call->count);
kunmap_atomic(buffer);
buffer = kmap(page);
ret = afs_extract_data(call, buffer,
call->count, true);
kunmap(buffer);
if (ret < 0)
return ret;
}
@ -376,8 +374,8 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
/* extract the metadata */
case 4:
ret = afs_extract_data(call, skb, last, call->buffer,
(21 + 3 + 6) * 4);
ret = afs_extract_data(call, call->buffer,
(21 + 3 + 6) * 4, false);
if (ret < 0)
return ret;
@ -391,18 +389,15 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
call->unmarshall++;
case 5:
ret = afs_data_complete(call, skb, last);
if (ret < 0)
return ret;
break;
}
if (call->count < PAGE_SIZE) {
_debug("clear");
page = call->reply3;
buffer = kmap_atomic(page);
buffer = kmap(page);
memset(buffer + call->count, 0, PAGE_SIZE - call->count);
kunmap_atomic(buffer);
kunmap(buffer);
}
_leave(" = 0 [done]");
@ -515,13 +510,12 @@ int afs_fs_fetch_data(struct afs_server *server,
/*
* deliver reply data to an FS.GiveUpCallBacks
*/
static int afs_deliver_fs_give_up_callbacks(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_give_up_callbacks(struct afs_call *call)
{
_enter(",{%u},%d", skb->len, last);
_enter("");
/* shouldn't be any reply data */
return afs_data_complete(call, skb, last);
return afs_extract_data(call, NULL, 0, false);
}
/*
@ -599,16 +593,15 @@ int afs_fs_give_up_callbacks(struct afs_server *server,
/*
* deliver reply data to an FS.CreateFile or an FS.MakeDir
*/
static int afs_deliver_fs_create_vnode(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_create_vnode(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -696,16 +689,15 @@ int afs_fs_create(struct afs_server *server,
/*
* deliver reply data to an FS.RemoveFile or FS.RemoveDir
*/
static int afs_deliver_fs_remove(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_remove(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -777,16 +769,15 @@ int afs_fs_remove(struct afs_server *server,
/*
* deliver reply data to an FS.Link
*/
static int afs_deliver_fs_link(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_link(struct afs_call *call)
{
struct afs_vnode *dvnode = call->reply, *vnode = call->reply2;
const __be32 *bp;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -863,16 +854,15 @@ int afs_fs_link(struct afs_server *server,
/*
* deliver reply data to an FS.Symlink
*/
static int afs_deliver_fs_symlink(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_symlink(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -968,16 +958,15 @@ int afs_fs_symlink(struct afs_server *server,
/*
* deliver reply data to an FS.Rename
*/
static int afs_deliver_fs_rename(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_rename(struct afs_call *call)
{
struct afs_vnode *orig_dvnode = call->reply, *new_dvnode = call->reply2;
const __be32 *bp;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -1072,16 +1061,15 @@ int afs_fs_rename(struct afs_server *server,
/*
* deliver reply data to an FS.StoreData
*/
static int afs_deliver_fs_store_data(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_store_data(struct afs_call *call)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
int ret;
_enter(",,%u", last);
_enter("");
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -1251,17 +1239,16 @@ int afs_fs_store_data(struct afs_server *server, struct afs_writeback *wb,
/*
* deliver reply data to an FS.StoreStatus
*/
static int afs_deliver_fs_store_status(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_store_status(struct afs_call *call)
{
afs_dataversion_t *store_version;
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
int ret;
_enter(",,%u", last);
_enter("");
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;
@ -1443,14 +1430,13 @@ int afs_fs_setattr(struct afs_server *server, struct key *key,
/*
* deliver reply data to an FS.GetVolumeStatus
*/
static int afs_deliver_fs_get_volume_status(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_get_volume_status(struct afs_call *call)
{
const __be32 *bp;
char *p;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
@ -1460,8 +1446,8 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
/* extract the returned status record */
case 1:
_debug("extract status");
ret = afs_extract_data(call, skb, last, call->buffer,
12 * 4);
ret = afs_extract_data(call, call->buffer,
12 * 4, true);
if (ret < 0)
return ret;
@ -1472,7 +1458,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
/* extract the volume name length */
case 2:
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
ret = afs_extract_data(call, &call->tmp, 4, true);
if (ret < 0)
return ret;
@ -1487,8 +1473,8 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
case 3:
_debug("extract volname");
if (call->count > 0) {
ret = afs_extract_data(call, skb, last, call->reply3,
call->count);
ret = afs_extract_data(call, call->reply3,
call->count, true);
if (ret < 0)
return ret;
}
@ -1508,8 +1494,8 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
call->count = 4 - (call->count & 3);
case 4:
ret = afs_extract_data(call, skb, last, call->buffer,
call->count);
ret = afs_extract_data(call, call->buffer,
call->count, true);
if (ret < 0)
return ret;
@ -1519,7 +1505,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
/* extract the offline message length */
case 5:
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
ret = afs_extract_data(call, &call->tmp, 4, true);
if (ret < 0)
return ret;
@ -1534,8 +1520,8 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
case 6:
_debug("extract offline");
if (call->count > 0) {
ret = afs_extract_data(call, skb, last, call->reply3,
call->count);
ret = afs_extract_data(call, call->reply3,
call->count, true);
if (ret < 0)
return ret;
}
@ -1555,8 +1541,8 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
call->count = 4 - (call->count & 3);
case 7:
ret = afs_extract_data(call, skb, last, call->buffer,
call->count);
ret = afs_extract_data(call, call->buffer,
call->count, true);
if (ret < 0)
return ret;
@ -1566,7 +1552,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
/* extract the message of the day length */
case 8:
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
ret = afs_extract_data(call, &call->tmp, 4, true);
if (ret < 0)
return ret;
@ -1581,8 +1567,8 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
case 9:
_debug("extract motd");
if (call->count > 0) {
ret = afs_extract_data(call, skb, last, call->reply3,
call->count);
ret = afs_extract_data(call, call->reply3,
call->count, true);
if (ret < 0)
return ret;
}
@ -1595,26 +1581,17 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call,
call->unmarshall++;
/* extract the message of the day padding */
if ((call->count & 3) == 0) {
call->unmarshall++;
goto no_motd_padding;
}
call->count = 4 - (call->count & 3);
call->count = (4 - (call->count & 3)) & 3;
case 10:
ret = afs_extract_data(call, skb, last, call->buffer,
call->count);
ret = afs_extract_data(call, call->buffer,
call->count, false);
if (ret < 0)
return ret;
call->offset = 0;
call->unmarshall++;
no_motd_padding:
case 11:
ret = afs_data_complete(call, skb, last);
if (ret < 0)
return ret;
break;
}
@ -1685,15 +1662,14 @@ int afs_fs_get_volume_status(struct afs_server *server,
/*
* deliver reply data to an FS.SetLock, FS.ExtendLock or FS.ReleaseLock
*/
static int afs_deliver_fs_xxxx_lock(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_fs_xxxx_lock(struct afs_call *call)
{
const __be32 *bp;
int ret;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
_enter("{%u}", call->unmarshall);
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;

33
fs/afs/internal.h
View File

@ -13,7 +13,6 @@
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/skbuff.h>
#include <linux/rxrpc.h>
#include <linux/key.h>
#include <linux/workqueue.h>
@ -57,7 +56,7 @@ struct afs_mount_params {
*/
struct afs_wait_mode {
/* RxRPC received message notification */
void (*rx_wakeup)(struct afs_call *call);
rxrpc_notify_rx_t notify_rx;
/* synchronous call waiter and call dispatched notification */
int (*wait)(struct afs_call *call);
@ -76,10 +75,8 @@ struct afs_call {
const struct afs_call_type *type; /* type of call */
const struct afs_wait_mode *wait_mode; /* completion wait mode */
wait_queue_head_t waitq; /* processes awaiting completion */
void (*async_workfn)(struct afs_call *call); /* asynchronous work function */
struct work_struct async_work; /* asynchronous work processor */
struct work_struct work; /* actual work processor */
struct sk_buff_head rx_queue; /* received packets */
struct rxrpc_call *rxcall; /* RxRPC call handle */
struct key *key; /* security for this call */
struct afs_server *server; /* server affected by incoming CM call */
@ -93,6 +90,7 @@ struct afs_call {
void *reply4; /* reply buffer (fourth part) */
pgoff_t first; /* first page in mapping to deal with */
pgoff_t last; /* last page in mapping to deal with */
size_t offset; /* offset into received data store */
enum { /* call state */
AFS_CALL_REQUESTING, /* request is being sent for outgoing call */
AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */
@ -100,21 +98,18 @@ struct afs_call {
AFS_CALL_AWAIT_REQUEST, /* awaiting request data on incoming call */
AFS_CALL_REPLYING, /* replying to incoming call */
AFS_CALL_AWAIT_ACK, /* awaiting final ACK of incoming call */
AFS_CALL_COMPLETE, /* successfully completed */
AFS_CALL_BUSY, /* server was busy */
AFS_CALL_ABORTED, /* call was aborted */
AFS_CALL_ERROR, /* call failed due to error */
AFS_CALL_COMPLETE, /* Completed or failed */
} state;
int error; /* error code */
u32 abort_code; /* Remote abort ID or 0 */
unsigned request_size; /* size of request data */
unsigned reply_max; /* maximum size of reply */
unsigned reply_size; /* current size of reply */
unsigned first_offset; /* offset into mapping[first] */
unsigned last_to; /* amount of mapping[last] */
unsigned offset; /* offset into received data store */
unsigned char unmarshall; /* unmarshalling phase */
bool incoming; /* T if incoming call */
bool send_pages; /* T if data from mapping should be sent */
bool need_attention; /* T if RxRPC poked us */
u16 service_id; /* RxRPC service ID to call */
__be16 port; /* target UDP port */
__be32 operation_ID; /* operation ID for an incoming call */
@ -129,8 +124,7 @@ struct afs_call_type {
/* deliver request or reply data to an call
* - returning an error will cause the call to be aborted
*/
int (*deliver)(struct afs_call *call, struct sk_buff *skb,
bool last);
int (*deliver)(struct afs_call *call);
/* map an abort code to an error number */
int (*abort_to_error)(u32 abort_code);
@ -612,27 +606,18 @@ extern struct socket *afs_socket;
extern int afs_open_socket(void);
extern void afs_close_socket(void);
extern void afs_data_consumed(struct afs_call *, struct sk_buff *);
extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
const struct afs_wait_mode *);
extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
size_t, size_t);
extern void afs_flat_call_destructor(struct afs_call *);
extern int afs_transfer_reply(struct afs_call *, struct sk_buff *, bool);
extern void afs_send_empty_reply(struct afs_call *);
extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
size_t);
extern int afs_extract_data(struct afs_call *, void *, size_t, bool);
static inline int afs_data_complete(struct afs_call *call, struct sk_buff *skb,
bool last)
static inline int afs_transfer_reply(struct afs_call *call)
{
if (skb->len > 0)
return -EBADMSG;
afs_data_consumed(call, skb);
if (!last)
return -EAGAIN;
return 0;
return afs_extract_data(call, call->buffer, call->reply_max, false);
}
/*

437
fs/afs/rxrpc.c
View File

@ -19,31 +19,31 @@
struct socket *afs_socket; /* my RxRPC socket */
static struct workqueue_struct *afs_async_calls;
static atomic_t afs_outstanding_calls;
static atomic_t afs_outstanding_skbs;
static void afs_wake_up_call_waiter(struct afs_call *);
static void afs_free_call(struct afs_call *);
static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
static int afs_wait_for_call_to_complete(struct afs_call *);
static void afs_wake_up_async_call(struct afs_call *);
static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
static int afs_dont_wait_for_call_to_complete(struct afs_call *);
static void afs_process_async_call(struct afs_call *);
static void afs_rx_interceptor(struct sock *, unsigned long, struct sk_buff *);
static int afs_deliver_cm_op_id(struct afs_call *, struct sk_buff *, bool);
static void afs_process_async_call(struct work_struct *);
static void afs_rx_new_call(struct sock *);
static int afs_deliver_cm_op_id(struct afs_call *);
/* synchronous call management */
const struct afs_wait_mode afs_sync_call = {
.rx_wakeup = afs_wake_up_call_waiter,
.notify_rx = afs_wake_up_call_waiter,
.wait = afs_wait_for_call_to_complete,
};
/* asynchronous call management */
const struct afs_wait_mode afs_async_call = {
.rx_wakeup = afs_wake_up_async_call,
.notify_rx = afs_wake_up_async_call,
.wait = afs_dont_wait_for_call_to_complete,
};
/* asynchronous incoming call management */
static const struct afs_wait_mode afs_async_incoming_call = {
.rx_wakeup = afs_wake_up_async_call,
.notify_rx = afs_wake_up_async_call,
};
/* asynchronous incoming call initial processing */
@ -55,16 +55,8 @@ static const struct afs_call_type afs_RXCMxxxx = {
static void afs_collect_incoming_call(struct work_struct *);
static struct sk_buff_head afs_incoming_calls;
static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call);
static void afs_async_workfn(struct work_struct *work)
{
struct afs_call *call = container_of(work, struct afs_call, async_work);
call->async_workfn(call);
}
static int afs_wait_atomic_t(atomic_t *p)
{
schedule();
@ -83,8 +75,6 @@ int afs_open_socket(void)
_enter("");
skb_queue_head_init(&afs_incoming_calls);
ret = -ENOMEM;
afs_async_calls = create_singlethread_workqueue("kafsd");
if (!afs_async_calls)
@ -110,12 +100,12 @@ int afs_open_socket(void)
if (ret < 0)
goto error_2;
rxrpc_kernel_new_call_notification(socket, afs_rx_new_call);
ret = kernel_listen(socket, INT_MAX);
if (ret < 0)
goto error_2;
rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor);
afs_socket = socket;
_leave(" = 0");
return 0;
@ -136,51 +126,19 @@ void afs_close_socket(void)
{
_enter("");
_debug("outstanding %u", atomic_read(&afs_outstanding_calls));
wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t,
TASK_UNINTERRUPTIBLE);
_debug("no outstanding calls");
flush_workqueue(afs_async_calls);
sock_release(afs_socket);
_debug("dework");
destroy_workqueue(afs_async_calls);
ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0);
_leave("");
}
/*
* Note that the data in a socket buffer is now consumed.
*/
void afs_data_consumed(struct afs_call *call, struct sk_buff *skb)
{
if (!skb) {
_debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs));
dump_stack();
} else {
_debug("DLVR %p{%u} [%d]",
skb, skb->mark, atomic_read(&afs_outstanding_skbs));
rxrpc_kernel_data_consumed(call->rxcall, skb);
}
}
/*
* free a socket buffer
*/
static void afs_free_skb(struct sk_buff *skb)
{
if (!skb) {
_debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs));
dump_stack();
} else {
_debug("FREE %p{%u} [%d]",
skb, skb->mark, atomic_read(&afs_outstanding_skbs));
if (atomic_dec_return(&afs_outstanding_skbs) == -1)
BUG();
rxrpc_kernel_free_skb(skb);
}
}
/*
* free a call
*/
@ -191,7 +149,6 @@ static void afs_free_call(struct afs_call *call)
ASSERTCMP(call->rxcall, ==, NULL);
ASSERT(!work_pending(&call->async_work));
ASSERT(skb_queue_empty(&call->rx_queue));
ASSERT(call->type->name != NULL);
kfree(call->request);
@ -227,7 +184,7 @@ static void afs_end_call(struct afs_call *call)
* allocate a call with flat request and reply buffers
*/
struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
size_t request_size, size_t reply_size)
size_t request_size, size_t reply_max)
{
struct afs_call *call;
@ -241,7 +198,7 @@ struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
call->type = type;
call->request_size = request_size;
call->reply_max = reply_size;
call->reply_max = reply_max;
if (request_size) {
call->request = kmalloc(request_size, GFP_NOFS);
@ -249,14 +206,13 @@ struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
goto nomem_free;
}
if (reply_size) {
call->buffer = kmalloc(reply_size, GFP_NOFS);
if (reply_max) {
call->buffer = kmalloc(reply_max, GFP_NOFS);
if (!call->buffer)
goto nomem_free;
}
init_waitqueue_head(&call->waitq);
skb_queue_head_init(&call->rx_queue);
return call;
nomem_free:
@ -354,7 +310,6 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
struct msghdr msg;
struct kvec iov[1];
int ret;
struct sk_buff *skb;
_enter("%x,{%d},", addr->s_addr, ntohs(call->port));
@ -366,8 +321,7 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
atomic_read(&afs_outstanding_calls));
call->wait_mode = wait_mode;
call->async_workfn = afs_process_async_call;
INIT_WORK(&call->async_work, afs_async_workfn);
INIT_WORK(&call->async_work, afs_process_async_call);
memset(&srx, 0, sizeof(srx));
srx.srx_family = AF_RXRPC;
@ -380,7 +334,8 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
/* create a call */
rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key,
(unsigned long) call, gfp);
(unsigned long) call, gfp,
wait_mode->notify_rx);
call->key = NULL;
if (IS_ERR(rxcall)) {
ret = PTR_ERR(rxcall);
@ -423,150 +378,84 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
error_do_abort:
rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT);
while ((skb = skb_dequeue(&call->rx_queue)))
afs_free_skb(skb);
error_kill_call:
afs_end_call(call);
_leave(" = %d", ret);
return ret;
}
/*
* Handles intercepted messages that were arriving in the socket's Rx queue.
*
* Called from the AF_RXRPC call processor in waitqueue process context. For
* each call, it is guaranteed this will be called in order of packet to be
* delivered.
*/
static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID,
struct sk_buff *skb)
{
struct afs_call *call = (struct afs_call *) user_call_ID;
_enter("%p,,%u", call, skb->mark);
_debug("ICPT %p{%u} [%d]",
skb, skb->mark, atomic_read(&afs_outstanding_skbs));
ASSERTCMP(sk, ==, afs_socket->sk);
atomic_inc(&afs_outstanding_skbs);
if (!call) {
/* its an incoming call for our callback service */
skb_queue_tail(&afs_incoming_calls, skb);
queue_work(afs_wq, &afs_collect_incoming_call_work);
} else {
/* route the messages directly to the appropriate call */
skb_queue_tail(&call->rx_queue, skb);
call->wait_mode->rx_wakeup(call);
}
_leave("");
}
/*
* deliver messages to a call
*/
static void afs_deliver_to_call(struct afs_call *call)
{
struct sk_buff *skb;
bool last;
u32 abort_code;
int ret;
_enter("");
_enter("%s", call->type->name);
while ((call->state == AFS_CALL_AWAIT_REPLY ||
call->state == AFS_CALL_AWAIT_OP_ID ||
call->state == AFS_CALL_AWAIT_REQUEST ||
call->state == AFS_CALL_AWAIT_ACK) &&
(skb = skb_dequeue(&call->rx_queue))) {
switch (skb->mark) {
case RXRPC_SKB_MARK_DATA:
_debug("Rcv DATA");
last = rxrpc_kernel_is_data_last(skb);
ret = call->type->deliver(call, skb, last);
switch (ret) {
case -EAGAIN:
if (last) {
_debug("short data");
goto unmarshal_error;
}
break;
case 0:
ASSERT(last);
if (call->state == AFS_CALL_AWAIT_REPLY)
call->state = AFS_CALL_COMPLETE;
break;
case -ENOTCONN:
abort_code = RX_CALL_DEAD;
goto do_abort;
case -ENOTSUPP:
abort_code = RX_INVALID_OPERATION;
goto do_abort;
default:
unmarshal_error:
abort_code = RXGEN_CC_UNMARSHAL;
if (call->state != AFS_CALL_AWAIT_REPLY)
abort_code = RXGEN_SS_UNMARSHAL;
do_abort:
rxrpc_kernel_abort_call(afs_socket,
call->rxcall,
abort_code);
call->error = ret;
call->state = AFS_CALL_ERROR;
break;
while (call->state == AFS_CALL_AWAIT_REPLY ||
call->state == AFS_CALL_AWAIT_OP_ID ||
call->state == AFS_CALL_AWAIT_REQUEST ||
call->state == AFS_CALL_AWAIT_ACK
) {
if (call->state == AFS_CALL_AWAIT_ACK) {
size_t offset = 0;
ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall,
NULL, 0, &offset, false,
&call->abort_code);
if (ret == -EINPROGRESS || ret == -EAGAIN)
return;
if (ret == 1) {
call->state = AFS_CALL_COMPLETE;
goto done;
}
break;
case RXRPC_SKB_MARK_FINAL_ACK:
_debug("Rcv ACK");
call->state = AFS_CALL_COMPLETE;
break;
case RXRPC_SKB_MARK_BUSY:
_debug("Rcv BUSY");
call->error = -EBUSY;
call->state = AFS_CALL_BUSY;
break;
case RXRPC_SKB_MARK_REMOTE_ABORT:
abort_code = rxrpc_kernel_get_abort_code(skb);
call->error = call->type->abort_to_error(abort_code);
call->state = AFS_CALL_ABORTED;
_debug("Rcv ABORT %u -> %d", abort_code, call->error);
break;
case RXRPC_SKB_MARK_LOCAL_ABORT:
abort_code = rxrpc_kernel_get_abort_code(skb);
call->error = call->type->abort_to_error(abort_code);
call->state = AFS_CALL_ABORTED;
_debug("Loc ABORT %u -> %d", abort_code, call->error);
break;
case RXRPC_SKB_MARK_NET_ERROR:
call->error = -rxrpc_kernel_get_error_number(skb);
call->state = AFS_CALL_ERROR;
_debug("Rcv NET ERROR %d", call->error);
break;
case RXRPC_SKB_MARK_LOCAL_ERROR:
call->error = -rxrpc_kernel_get_error_number(skb);
call->state = AFS_CALL_ERROR;
_debug("Rcv LOCAL ERROR %d", call->error);
break;
default:
BUG();
break;
return;
}
afs_free_skb(skb);
}
/* make sure the queue is empty if the call is done with (we might have
* aborted the call early because of an unmarshalling error) */
if (call->state >= AFS_CALL_COMPLETE) {
while ((skb = skb_dequeue(&call->rx_queue)))
afs_free_skb(skb);
if (call->incoming)
afs_end_call(call);
ret = call->type->deliver(call);
switch (ret) {
case 0:
if (call->state == AFS_CALL_AWAIT_REPLY)
call->state = AFS_CALL_COMPLETE;
goto done;
case -EINPROGRESS:
case -EAGAIN:
goto out;
case -ENOTCONN:
abort_code = RX_CALL_DEAD;
rxrpc_kernel_abort_call(afs_socket, call->rxcall,
abort_code);
goto do_abort;
case -ENOTSUPP:
abort_code = RX_INVALID_OPERATION;
rxrpc_kernel_abort_call(afs_socket, call->rxcall,
abort_code);
goto do_abort;
case -ENODATA:
case -EBADMSG:
case -EMSGSIZE:
default:
abort_code = RXGEN_CC_UNMARSHAL;
if (call->state != AFS_CALL_AWAIT_REPLY)
abort_code = RXGEN_SS_UNMARSHAL;
rxrpc_kernel_abort_call(afs_socket, call->rxcall,
abort_code);
goto do_abort;
}
}
done:
if (call->state == AFS_CALL_COMPLETE && call->incoming)
afs_end_call(call);
out:
_leave("");
return;
do_abort:
call->error = ret;
call->state = AFS_CALL_COMPLETE;
goto done;
}
/*
@ -574,7 +463,6 @@ static void afs_deliver_to_call(struct afs_call *call)
*/
static int afs_wait_for_call_to_complete(struct afs_call *call)
{
struct sk_buff *skb;
int ret;
DECLARE_WAITQUEUE(myself, current);
@ -586,14 +474,15 @@ static int afs_wait_for_call_to_complete(struct afs_call *call)
set_current_state(TASK_INTERRUPTIBLE);
/* deliver any messages that are in the queue */
if (!skb_queue_empty(&call->rx_queue)) {
if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
call->need_attention = false;
__set_current_state(TASK_RUNNING);
afs_deliver_to_call(call);
continue;
}
ret = call->error;
if (call->state >= AFS_CALL_COMPLETE)
if (call->state == AFS_CALL_COMPLETE)
break;
ret = -EINTR;
if (signal_pending(current))
@ -607,9 +496,8 @@ static int afs_wait_for_call_to_complete(struct afs_call *call)
/* kill the call */
if (call->state < AFS_CALL_COMPLETE) {
_debug("call incomplete");
rxrpc_kernel_abort_call(afs_socket, call->rxcall, RX_CALL_DEAD);
while ((skb = skb_dequeue(&call->rx_queue)))
afs_free_skb(skb);
rxrpc_kernel_abort_call(afs_socket, call->rxcall,
RX_CALL_DEAD);
}
_debug("call complete");
@ -621,17 +509,24 @@ static int afs_wait_for_call_to_complete(struct afs_call *call)
/*
* wake up a waiting call
*/
static void afs_wake_up_call_waiter(struct afs_call *call)
static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
unsigned long call_user_ID)
{
struct afs_call *call = (struct afs_call *)call_user_ID;
call->need_attention = true;
wake_up(&call->waitq);
}
/*
* wake up an asynchronous call
*/
static void afs_wake_up_async_call(struct afs_call *call)
static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
unsigned long call_user_ID)
{
_enter("");
struct afs_call *call = (struct afs_call *)call_user_ID;
call->need_attention = true;
queue_work(afs_async_calls, &call->async_work);
}
@ -649,8 +544,10 @@ static int afs_dont_wait_for_call_to_complete(struct afs_call *call)
/*
* delete an asynchronous call
*/
static void afs_delete_async_call(struct afs_call *call)
static void afs_delete_async_call(struct work_struct *work)
{
struct afs_call *call = container_of(work, struct afs_call, async_work);
_enter("");
afs_free_call(call);
@ -660,17 +557,19 @@ static void afs_delete_async_call(struct afs_call *call)
/*
* perform processing on an asynchronous call
* - on a multiple-thread workqueue this work item may try to run on several
* CPUs at the same time
*/
static void afs_process_async_call(struct afs_call *call)
static void afs_process_async_call(struct work_struct *work)
{
struct afs_call *call = container_of(work, struct afs_call, async_work);
_enter("");
if (!skb_queue_empty(&call->rx_queue))
if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
call->need_attention = false;
afs_deliver_to_call(call);
}
if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) {
if (call->state == AFS_CALL_COMPLETE && call->wait_mode) {
if (call->wait_mode->async_complete)
call->wait_mode->async_complete(call->reply,
call->error);
@ -681,45 +580,13 @@ static void afs_process_async_call(struct afs_call *call)
/* we can't just delete the call because the work item may be
* queued */
call->async_workfn = afs_delete_async_call;
call->async_work.func = afs_delete_async_call;
queue_work(afs_async_calls, &call->async_work);
}
_leave("");
}
/*
* Empty a socket buffer into a flat reply buffer.
*/
int afs_transfer_reply(struct afs_call *call, struct sk_buff *skb, bool last)
{
size_t len = skb->len;
if (len > call->reply_max - call->reply_size) {
_leave(" = -EBADMSG [%zu > %u]",
len, call->reply_max - call->reply_size);
return -EBADMSG;
}
if (len > 0) {
if (skb_copy_bits(skb, 0, call->buffer + call->reply_size,
len) < 0)
BUG();
call->reply_size += len;
}
afs_data_consumed(call, skb);
if (!last)
return -EAGAIN;
if (call->reply_size != call->reply_max) {
_leave(" = -EBADMSG [%u != %u]",
call->reply_size, call->reply_max);
return -EBADMSG;
}
return 0;
}
/*
* accept the backlog of incoming calls
*/
@ -727,14 +594,10 @@ static void afs_collect_incoming_call(struct work_struct *work)
{
struct rxrpc_call *rxcall;
struct afs_call *call = NULL;
struct sk_buff *skb;
while ((skb = skb_dequeue(&afs_incoming_calls))) {
_debug("new call");
/* don't need the notification */
afs_free_skb(skb);
_enter("");
do {
if (!call) {
call = kzalloc(sizeof(struct afs_call), GFP_KERNEL);
if (!call) {
@ -742,12 +605,10 @@ static void afs_collect_incoming_call(struct work_struct *work)
return;
}
call->async_workfn = afs_process_async_call;
INIT_WORK(&call->async_work, afs_async_workfn);
INIT_WORK(&call->async_work, afs_process_async_call);
call->wait_mode = &afs_async_incoming_call;
call->type = &afs_RXCMxxxx;
init_waitqueue_head(&call->waitq);
skb_queue_head_init(&call->rx_queue);
call->state = AFS_CALL_AWAIT_OP_ID;
_debug("CALL %p{%s} [%d]",
@ -757,46 +618,47 @@ static void afs_collect_incoming_call(struct work_struct *work)
}
rxcall = rxrpc_kernel_accept_call(afs_socket,
(unsigned long) call);
(unsigned long)call,
afs_wake_up_async_call);
if (!IS_ERR(rxcall)) {
call->rxcall = rxcall;
call->need_attention = true;
queue_work(afs_async_calls, &call->async_work);
call = NULL;
}
}
} while (!call);
if (call)
afs_free_call(call);
}
/*
* Notification of an incoming call.
*/
static void afs_rx_new_call(struct sock *sk)
{
queue_work(afs_wq, &afs_collect_incoming_call_work);
}
/*
* Grab the operation ID from an incoming cache manager call. The socket
* buffer is discarded on error or if we don't yet have sufficient data.
*/
static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb,
bool last)
static int afs_deliver_cm_op_id(struct afs_call *call)
{
size_t len = skb->len;
void *oibuf = (void *) &call->operation_ID;
int ret;
_enter("{%u},{%zu},%d", call->offset, len, last);
_enter("{%zu}", call->offset);
ASSERTCMP(call->offset, <, 4);
/* the operation ID forms the first four bytes of the request data */
len = min_t(size_t, len, 4 - call->offset);
if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0)
BUG();
if (!pskb_pull(skb, len))
BUG();
call->offset += len;
if (call->offset < 4) {
afs_data_consumed(call, skb);
_leave(" = -EAGAIN");
return -EAGAIN;
}
ret = afs_extract_data(call, &call->operation_ID, 4, true);
if (ret < 0)
return ret;
call->state = AFS_CALL_AWAIT_REQUEST;
call->offset = 0;
/* ask the cache manager to route the call (it'll change the call type
* if successful) */
@ -805,7 +667,7 @@ static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb,
/* pass responsibility for the remainer of this message off to the
* cache manager op */
return call->type->deliver(call, skb, last);
return call->type->deliver(call);
}
/*
@ -881,25 +743,40 @@ void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
/*
* Extract a piece of data from the received data socket buffers.
*/
int afs_extract_data(struct afs_call *call, struct sk_buff *skb,
bool last, void *buf, size_t count)
int afs_extract_data(struct afs_call *call, void *buf, size_t count,
bool want_more)
{
size_t len = skb->len;
int ret;
_enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count);
_enter("{%s,%zu},,%zu,%d",
call->type->name, call->offset, count, want_more);
ASSERTCMP(call->offset, <, count);
ASSERTCMP(call->offset, <=, count);
len = min_t(size_t, len, count - call->offset);
if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 ||
!pskb_pull(skb, len))
BUG();
call->offset += len;
ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall,
buf, count, &call->offset,
want_more, &call->abort_code);
if (ret == 0 || ret == -EAGAIN)
return ret;
if (call->offset < count) {
afs_data_consumed(call, skb);
_leave(" = -EAGAIN");
return -EAGAIN;
if (ret == 1) {
switch (call->state) {
case AFS_CALL_AWAIT_REPLY:
call->state = AFS_CALL_COMPLETE;
break;
case AFS_CALL_AWAIT_REQUEST:
call->state = AFS_CALL_REPLYING;
break;
default:
break;
}
return 0;
}
return 0;
if (ret == -ECONNABORTED)
call->error = call->type->abort_to_error(call->abort_code);
else
call->error = ret;
call->state = AFS_CALL_COMPLETE;
return ret;
}

7
fs/afs/vlclient.c
View File

@ -58,17 +58,16 @@ static int afs_vl_abort_to_error(u32 abort_code)
/*
* deliver reply data to a VL.GetEntryByXXX call
*/
static int afs_deliver_vl_get_entry_by_xxx(struct afs_call *call,
struct sk_buff *skb, bool last)
static int afs_deliver_vl_get_entry_by_xxx(struct afs_call *call)
{
struct afs_cache_vlocation *entry;
__be32 *bp;
u32 tmp;
int loop, ret;
_enter(",,%u", last);
_enter("");
ret = afs_transfer_reply(call, skb, last);
ret = afs_transfer_reply(call);
if (ret < 0)
return ret;

35
include/net/af_rxrpc.h
View File

@ -12,7 +12,6 @@
#ifndef _NET_RXRPC_H
#define _NET_RXRPC_H
#include <linux/skbuff.h>
#include <linux/rxrpc.h>
struct key;
@ -20,38 +19,26 @@ struct sock;
struct socket;
struct rxrpc_call;
/*
* the mark applied to socket buffers that may be intercepted
*/
enum rxrpc_skb_mark {
RXRPC_SKB_MARK_DATA, /* data message */
RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */
RXRPC_SKB_MARK_BUSY, /* server busy message */
RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */
RXRPC_SKB_MARK_LOCAL_ABORT, /* local abort message */
RXRPC_SKB_MARK_NET_ERROR, /* network error message */
RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */
RXRPC_SKB_MARK_NEW_CALL, /* local error message */
};
typedef void (*rxrpc_notify_rx_t)(struct sock *, struct rxrpc_call *,
unsigned long);
typedef void (*rxrpc_notify_new_call_t)(struct sock *);
typedef void (*rxrpc_interceptor_t)(struct sock *, unsigned long,
struct sk_buff *);
void rxrpc_kernel_intercept_rx_messages(struct socket *, rxrpc_interceptor_t);
void rxrpc_kernel_new_call_notification(struct socket *,
rxrpc_notify_new_call_t);
struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *,
struct sockaddr_rxrpc *,
struct key *,
unsigned long,
gfp_t);
gfp_t,
rxrpc_notify_rx_t);
int rxrpc_kernel_send_data(struct socket *, struct rxrpc_call *,
struct msghdr *, size_t);
void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
int rxrpc_kernel_recv_data(struct socket *, struct rxrpc_call *,
void *, size_t, size_t *, bool, u32 *);
void rxrpc_kernel_abort_call(struct socket *, struct rxrpc_call *, u32);
void rxrpc_kernel_end_call(struct socket *, struct rxrpc_call *);
bool rxrpc_kernel_is_data_last(struct sk_buff *);
u32 rxrpc_kernel_get_abort_code(struct sk_buff *);
int rxrpc_kernel_get_error_number(struct sk_buff *);
void rxrpc_kernel_free_skb(struct sk_buff *);
struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *, unsigned long);
struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *, unsigned long,
rxrpc_notify_rx_t);
int rxrpc_kernel_reject_call(struct socket *);
void rxrpc_kernel_get_peer(struct socket *, struct rxrpc_call *,
struct sockaddr_rxrpc *);

29
net/rxrpc/af_rxrpc.c
View File

@ -231,6 +231,8 @@ static int rxrpc_listen(struct socket *sock, int backlog)
* @srx: The address of the peer to contact
* @key: The security context to use (defaults to socket setting)
* @user_call_ID: The ID to use
* @gfp: The allocation constraints
* @notify_rx: Where to send notifications instead of socket queue
*
* Allow a kernel service to begin a call on the nominated socket. This just
* sets up all the internal tracking structures and allocates connection and
@ -243,7 +245,8 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
struct sockaddr_rxrpc *srx,
struct key *key,
unsigned long user_call_ID,
gfp_t gfp)
gfp_t gfp,
rxrpc_notify_rx_t notify_rx)
{
struct rxrpc_conn_parameters cp;
struct rxrpc_call *call;
@ -270,6 +273,8 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
cp.exclusive = false;
cp.service_id = srx->srx_service;
call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
if (!IS_ERR(call))
call->notify_rx = notify_rx;
release_sock(&rx->sk);
_leave(" = %p", call);
@ -289,31 +294,27 @@ void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
{
_enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
rxrpc_remove_user_ID(rxrpc_sk(sock->sk), call);
rxrpc_purge_queue(&call->knlrecv_queue);
rxrpc_put_call(call);
}
EXPORT_SYMBOL(rxrpc_kernel_end_call);
/**
* rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
* rxrpc_kernel_new_call_notification - Get notifications of new calls
* @sock: The socket to intercept received messages on
* @interceptor: The function to pass the messages to
* @notify_new_call: Function to be called when new calls appear
*
* Allow a kernel service to intercept messages heading for the Rx queue on an
* RxRPC socket. They get passed to the specified function instead.
* @interceptor should free the socket buffers it is given. @interceptor is
* called with the socket receive queue spinlock held and softirqs disabled -
* this ensures that the messages will be delivered in the right order.
* Allow a kernel service to be given notifications about new calls.
*/
void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
rxrpc_interceptor_t interceptor)
void rxrpc_kernel_new_call_notification(
struct socket *sock,
rxrpc_notify_new_call_t notify_new_call)
{
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
_enter("");
rx->interceptor = interceptor;
rx->notify_new_call = notify_new_call;
}
EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
/*
* connect an RxRPC socket

23
net/rxrpc/ar-internal.h
View File

@ -39,6 +39,20 @@ struct rxrpc_crypt {
struct rxrpc_connection;
/*
* Mark applied to socket buffers.
*/
enum rxrpc_skb_mark {
RXRPC_SKB_MARK_DATA, /* data message */
RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */
RXRPC_SKB_MARK_BUSY, /* server busy message */
RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */
RXRPC_SKB_MARK_LOCAL_ABORT, /* local abort message */
RXRPC_SKB_MARK_NET_ERROR, /* network error message */
RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */
RXRPC_SKB_MARK_NEW_CALL, /* local error message */
};
/*
* sk_state for RxRPC sockets
*/
@ -57,7 +71,7 @@ enum {
struct rxrpc_sock {
/* WARNING: sk has to be the first member */
struct sock sk;
rxrpc_interceptor_t interceptor; /* kernel service Rx interceptor function */
rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
struct rxrpc_local *local; /* local endpoint */
struct list_head listen_link; /* link in the local endpoint's listen list */
struct list_head secureq; /* calls awaiting connection security clearance */
@ -367,6 +381,7 @@ enum rxrpc_call_flag {
RXRPC_CALL_EXPECT_OOS, /* expect out of sequence packets */
RXRPC_CALL_IS_SERVICE, /* Call is service call */
RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
RXRPC_CALL_RX_NO_MORE, /* Don't indicate MSG_MORE from recvmsg() */
};
/*
@ -441,6 +456,7 @@ struct rxrpc_call {
struct timer_list resend_timer; /* Tx resend timer */
struct work_struct destroyer; /* call destroyer */
struct work_struct processor; /* packet processor and ACK generator */
rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
struct list_head link; /* link in master call list */
struct list_head chan_wait_link; /* Link in conn->waiting_calls */
struct hlist_node error_link; /* link in error distribution list */
@ -448,6 +464,7 @@ struct rxrpc_call {
struct rb_node sock_node; /* node in socket call tree */
struct sk_buff_head rx_queue; /* received packets */
struct sk_buff_head rx_oos_queue; /* packets received out of sequence */
struct sk_buff_head knlrecv_queue; /* Queue for kernel_recv [TODO: replace this] */
struct sk_buff *tx_pending; /* Tx socket buffer being filled */
wait_queue_head_t waitq; /* Wait queue for channel or Tx */
__be32 crypto_buf[2]; /* Temporary packet crypto buffer */
@ -512,7 +529,8 @@ extern struct workqueue_struct *rxrpc_workqueue;
* call_accept.c
*/
void rxrpc_accept_incoming_calls(struct rxrpc_local *);
struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
rxrpc_notify_rx_t);
int rxrpc_reject_call(struct rxrpc_sock *);
/*
@ -874,6 +892,7 @@ int rxrpc_init_server_conn_security(struct rxrpc_connection *);
/*
* skbuff.c
*/
void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
void rxrpc_packet_destructor(struct sk_buff *);
void rxrpc_new_skb(struct sk_buff *);
void rxrpc_see_skb(struct sk_buff *);

13
net/rxrpc/call_accept.c
View File

@ -286,7 +286,8 @@ security_mismatch:
* - assign the user call ID to the call at the front of the queue
*/
struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx,
unsigned long user_call_ID)
unsigned long user_call_ID,
rxrpc_notify_rx_t notify_rx)
{
struct rxrpc_call *call;
struct rb_node *parent, **pp;
@ -340,6 +341,7 @@ struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx,
}
/* formalise the acceptance */
call->notify_rx = notify_rx;
call->user_call_ID = user_call_ID;
rb_link_node(&call->sock_node, parent, pp);
rb_insert_color(&call->sock_node, &rx->calls);
@ -437,17 +439,20 @@ out:
* rxrpc_kernel_accept_call - Allow a kernel service to accept an incoming call
* @sock: The socket on which the impending call is waiting
* @user_call_ID: The tag to attach to the call
* @notify_rx: Where to send notifications instead of socket queue
*
* Allow a kernel service to accept an incoming call, assuming the incoming
* call is still valid.
* call is still valid. The caller should immediately trigger their own
* notification as there must be data waiting.
*/
struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *sock,
unsigned long user_call_ID)
unsigned long user_call_ID,
rxrpc_notify_rx_t notify_rx)
{
struct rxrpc_call *call;
_enter(",%lx", user_call_ID);
call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID);
call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID, notify_rx);
_leave(" = %p", call);
return call;
}

5
net/rxrpc/call_object.c
View File

@ -136,6 +136,7 @@ static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
INIT_LIST_HEAD(&call->accept_link);
skb_queue_head_init(&call->rx_queue);
skb_queue_head_init(&call->rx_oos_queue);
skb_queue_head_init(&call->knlrecv_queue);
init_waitqueue_head(&call->waitq);
spin_lock_init(&call->lock);
rwlock_init(&call->state_lock);
@ -552,8 +553,6 @@ void rxrpc_release_call(struct rxrpc_call *call)
spin_lock_bh(&call->lock);
}
spin_unlock_bh(&call->lock);
ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE);
}
del_timer_sync(&call->resend_timer);
@ -682,6 +681,7 @@ static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
rxrpc_purge_queue(&call->rx_queue);
rxrpc_purge_queue(&call->knlrecv_queue);
rxrpc_put_peer(call->peer);
kmem_cache_free(rxrpc_call_jar, call);
}
@ -737,6 +737,7 @@ static void rxrpc_cleanup_call(struct rxrpc_call *call)
rxrpc_purge_queue(&call->rx_queue);
ASSERT(skb_queue_empty(&call->rx_oos_queue));
rxrpc_purge_queue(&call->knlrecv_queue);
sock_put(&call->socket->sk);
call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
}

1
net/rxrpc/conn_event.c
View File

@ -282,7 +282,6 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
case RXRPC_PACKET_TYPE_DATA:
case RXRPC_PACKET_TYPE_ACK:
rxrpc_conn_retransmit_call(conn, skb);
rxrpc_free_skb(skb);
return 0;
case RXRPC_PACKET_TYPE_ABORT:

10
net/rxrpc/input.c
View File

@ -90,9 +90,15 @@ int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
}
/* allow interception by a kernel service */
if (rx->interceptor) {
rx->interceptor(sk, call->user_call_ID, skb);
if (skb->mark == RXRPC_SKB_MARK_NEW_CALL &&
rx->notify_new_call) {
spin_unlock_bh(&sk->sk_receive_queue.lock);
skb_queue_tail(&call->knlrecv_queue, skb);
rx->notify_new_call(&rx->sk);
} else if (call->notify_rx) {
spin_unlock_bh(&sk->sk_receive_queue.lock);
skb_queue_tail(&call->knlrecv_queue, skb);
call->notify_rx(&rx->sk, call, call->user_call_ID);
} else {
_net("post skb %p", skb);
__skb_queue_tail(&sk->sk_receive_queue, skb);

2
net/rxrpc/output.c
View File

@ -190,7 +190,7 @@ int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
if (cmd == RXRPC_CMD_ACCEPT) {
if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
return -EINVAL;
call = rxrpc_accept_call(rx, user_call_ID);
call = rxrpc_accept_call(rx, user_call_ID, NULL);
if (IS_ERR(call))
return PTR_ERR(call);
rxrpc_put_call(call);

195
net/rxrpc/recvmsg.c
View File

@ -369,55 +369,178 @@ wait_error:
}
/**
* rxrpc_kernel_is_data_last - Determine if data message is last one
* @skb: Message holding data
/*
* Deliver messages to a call. This keeps processing packets until the buffer
* is filled and we find either more DATA (returns 0) or the end of the DATA
* (returns 1). If more packets are required, it returns -EAGAIN.
*
* Determine if data message is last one for the parent call.
* TODO: Note that this is hacked in at the moment and will be replaced.
*/
bool rxrpc_kernel_is_data_last(struct sk_buff *skb)
static int temp_deliver_data(struct socket *sock, struct rxrpc_call *call,
struct iov_iter *iter, size_t size,
size_t *_offset)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct rxrpc_skb_priv *sp;
struct sk_buff *skb;
size_t remain;
int ret, copy;
ASSERTCMP(skb->mark, ==, RXRPC_SKB_MARK_DATA);
_enter("%d", call->debug_id);
return sp->hdr.flags & RXRPC_LAST_PACKET;
}
next:
local_bh_disable();
skb = skb_dequeue(&call->knlrecv_queue);
local_bh_enable();
if (!skb) {
if (test_bit(RXRPC_CALL_RX_NO_MORE, &call->flags))
return 1;
_leave(" = -EAGAIN [empty]");
return -EAGAIN;
}
EXPORT_SYMBOL(rxrpc_kernel_is_data_last);
/**
* rxrpc_kernel_get_abort_code - Get the abort code from an RxRPC abort message
* @skb: Message indicating an abort
*
* Get the abort code from an RxRPC abort message.
*/
u32 rxrpc_kernel_get_abort_code(struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
sp = rxrpc_skb(skb);
_debug("dequeued %p %u/%zu", skb, sp->offset, size);
switch (skb->mark) {
case RXRPC_SKB_MARK_REMOTE_ABORT:
case RXRPC_SKB_MARK_LOCAL_ABORT:
return sp->call->abort_code;
default:
BUG();
}
}
case RXRPC_SKB_MARK_DATA:
remain = size - *_offset;
if (remain > 0) {
copy = skb->len - sp->offset;
if (copy > remain)
copy = remain;
ret = skb_copy_datagram_iter(skb, sp->offset, iter,
copy);
if (ret < 0)
goto requeue_and_leave;
EXPORT_SYMBOL(rxrpc_kernel_get_abort_code);
/* handle piecemeal consumption of data packets */
sp->offset += copy;
*_offset += copy;
}
if (sp->offset < skb->len)
goto partially_used_skb;
/* We consumed the whole packet */
ASSERTCMP(sp->offset, ==, skb->len);
if (sp->hdr.flags & RXRPC_LAST_PACKET)
set_bit(RXRPC_CALL_RX_NO_MORE, &call->flags);
rxrpc_kernel_data_consumed(call, skb);
rxrpc_free_skb(skb);
goto next;
default:
rxrpc_free_skb(skb);
goto next;
}
partially_used_skb:
ASSERTCMP(*_offset, ==, size);
ret = 0;
requeue_and_leave:
skb_queue_head(&call->knlrecv_queue, skb);
return ret;
}
/**
* rxrpc_kernel_get_error - Get the error number from an RxRPC error message
* @skb: Message indicating an error
* rxrpc_kernel_recv_data - Allow a kernel service to receive data/info
* @sock: The socket that the call exists on
* @call: The call to send data through
* @buf: The buffer to receive into
* @size: The size of the buffer, including data already read
* @_offset: The running offset into the buffer.
* @want_more: True if more data is expected to be read
* @_abort: Where the abort code is stored if -ECONNABORTED is returned
*
* Get the error number from an RxRPC error message.
* Allow a kernel service to receive data and pick up information about the
* state of a call. Returns 0 if got what was asked for and there's more
* available, 1 if we got what was asked for and we're at the end of the data
* and -EAGAIN if we need more data.
*
* Note that we may return -EAGAIN to drain empty packets at the end of the
* data, even if we've already copied over the requested data.
*
* This function adds the amount it transfers to *_offset, so this should be
* precleared as appropriate. Note that the amount remaining in the buffer is
* taken to be size - *_offset.
*
* *_abort should also be initialised to 0.
*/
int rxrpc_kernel_get_error_number(struct sk_buff *skb)
int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
void *buf, size_t size, size_t *_offset,
bool want_more, u32 *_abort)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct iov_iter iter;
struct kvec iov;
int ret;
return sp->error;
_enter("{%d,%s},%zu,%d",
call->debug_id, rxrpc_call_states[call->state], size, want_more);
ASSERTCMP(*_offset, <=, size);
ASSERTCMP(call->state, !=, RXRPC_CALL_SERVER_ACCEPTING);
iov.iov_base = buf + *_offset;
iov.iov_len = size - *_offset;
iov_iter_kvec(&iter, ITER_KVEC | READ, &iov, 1, size - *_offset);
lock_sock(sock->sk);
switch (call->state) {
case RXRPC_CALL_CLIENT_RECV_REPLY:
case RXRPC_CALL_SERVER_RECV_REQUEST:
case RXRPC_CALL_SERVER_ACK_REQUEST:
ret = temp_deliver_data(sock, call, &iter, size, _offset);
if (ret < 0)
goto out;
/* We can only reach here with a partially full buffer if we
* have reached the end of the data. We must otherwise have a
* full buffer or have been given -EAGAIN.
*/
if (ret == 1) {
if (*_offset < size)
goto short_data;
if (!want_more)
goto read_phase_complete;
ret = 0;
goto out;
}
if (!want_more)
goto excess_data;
goto out;
case RXRPC_CALL_COMPLETE:
goto call_complete;
default:
*_offset = 0;
ret = -EINPROGRESS;
goto out;
}
read_phase_complete:
ret = 1;
out:
release_sock(sock->sk);
_leave(" = %d [%zu,%d]", ret, *_offset, *_abort);
return ret;
short_data:
ret = -EBADMSG;
goto out;
excess_data:
ret = -EMSGSIZE;
goto out;
call_complete:
*_abort = call->abort_code;
ret = call->error;
if (call->completion == RXRPC_CALL_SUCCEEDED) {
ret = 1;
if (size > 0)
ret = -ECONNRESET;
}
goto out;
}
EXPORT_SYMBOL(rxrpc_kernel_get_error_number);
EXPORT_SYMBOL(rxrpc_kernel_recv_data);

1
net/rxrpc/skbuff.c
View File

@ -127,7 +127,6 @@ void rxrpc_kernel_data_consumed(struct rxrpc_call *call, struct sk_buff *skb)
call->rx_data_recv = sp->hdr.seq;
rxrpc_hard_ACK_data(call, skb);
}
EXPORT_SYMBOL(rxrpc_kernel_data_consumed);
/*
* Destroy a packet that has an RxRPC control buffer