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Date: Fri, 8 Oct 2010 17:02:02 +0300
From: Rémi Denis-Courmont <remi@...lab.net>
To: netdev@...r.kernel.org
Cc: Rémi Denis-Courmont
<remi.denis-courmont@...ia.com>,
Kumar Sanghvi <kumar.sanghvi@...ricsson.com>
Subject: [PATCH 3/4] Phonet: cleanup pipe enable socket option
From: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
The current code works like this:
int garbage, status;
socklen_t len = sizeof(status);
/* enable pipe */
setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &garbage, sizeof(garbage));
/* disable pipe */
setsockopt(fd, SOL_PNPIPE, PNPIPE_DISABLE, &garbage, sizeof(garbage));
/* get status */
getsockopt(fd, SOL_PNPIPE, PNPIPE_INQ, &status, &len);
...which does not follow the usual socket option pattern. This patch
merges all three "options" into a single gettable&settable option,
before Linux 2.6.37 gets out:
int status;
socklen_t len = sizeof(status);
/* enable pipe */
status = 1;
setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, sizeof(status));
/* disable pipe */
status = 0;
setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, sizeof(status));
/* get status */
getsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, &len);
This also fixes the error code from EFAULT to ENOTCONN.
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
Cc: Kumar Sanghvi <kumar.sanghvi@...ricsson.com>
---
Documentation/networking/phonet.txt | 15 +------
include/linux/phonet.h | 3 +-
net/phonet/pep.c | 72 ++++++++++++++--------------------
3 files changed, 34 insertions(+), 56 deletions(-)
diff --git a/Documentation/networking/phonet.txt b/Documentation/networking/phonet.txt
index cccf5ff..2d9bc2b 100644
--- a/Documentation/networking/phonet.txt
+++ b/Documentation/networking/phonet.txt
@@ -213,12 +213,9 @@ The implementation adds socket options at SOL_PNPIPE level:
It then updates the pipe state associated with the sequenced socket to
be PIPE_DISABLED.
- PNPIPE_ENABLE
- It follows the same sequence as above for enabling a pipe by sending
- PNS_PEP_ENABLE_REQ initially and then sending PNS_PEP_ENABLED_IND after
- getting responses from sequenced socket and remote-pep.
- It will also update the pipe state associated with the sequenced socket
- to PIPE_ENABLED.
+ PNPIPE_ENABLE accepts one integer value (int). If set to zero, the pipe
+ is disabled. If the value is non-zero, the pipe is enabled. If the pipe
+ is not (yet) connected, ENOTCONN is error is returned.
PNPIPE_DESTROY
This will send out PNS_PEP_DISCONNECT_REQ on the sequenced socket and
@@ -226,12 +223,6 @@ The implementation adds socket options at SOL_PNPIPE level:
It will also update the pipe state associated with the sequenced socket
to PIPE_IDLE
- PNPIPE_INQ
- This getsocktopt allows the user-space running on the sequenced socket
- to examine the pipe state associated with that socket ie. whether the
- pipe is created (PIPE_DISABLED) or enabled (PIPE_ENABLED) or disabled
- (PIPE_DISABLED) or no pipe exists (PIPE_IDLE).
-
After a pipe has been created and enabled successfully, the Pipe data can be
exchanged between the host-pep and remote-pep (modem).
diff --git a/include/linux/phonet.h b/include/linux/phonet.h
index 96f5625..e27cbf9 100644
--- a/include/linux/phonet.h
+++ b/include/linux/phonet.h
@@ -38,9 +38,8 @@
#define PNPIPE_IFINDEX 2
#define PNPIPE_CREATE 3
#define PNPIPE_ENABLE 4
-#define PNPIPE_DISABLE 5
+/* unused slot */
#define PNPIPE_DESTROY 6
-#define PNPIPE_INQ 7
#define PNADDR_ANY 0
#define PNADDR_BROADCAST 0xFC
diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index aa3d870..f818f76 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -327,29 +327,20 @@ static int pipe_handler_send_ind(struct sock *sk, u16 dobj, u8 utid,
return pn_skb_send(sk, skb, &spn);
}
-static int pipe_handler_enable_pipe(struct sock *sk, int cmd)
+static int pipe_handler_enable_pipe(struct sock *sk, int enable)
{
- int ret;
struct pep_sock *pn = pep_sk(sk);
-
- switch (cmd) {
- case PNPIPE_ENABLE:
- ret = pipe_handler_send_req(sk, pn->pn_sk.sobject,
- PNS_PIPE_ENABLE_UTID, PNS_PEP_ENABLE_REQ,
- pn->pipe_handle, GFP_ATOMIC);
- break;
-
- case PNPIPE_DISABLE:
- ret = pipe_handler_send_req(sk, pn->pn_sk.sobject,
- PNS_PIPE_DISABLE_UTID, PNS_PEP_DISABLE_REQ,
- pn->pipe_handle, GFP_ATOMIC);
- break;
-
- default:
- ret = -EINVAL;
+ int utid, req;
+
+ if (enable) {
+ utid = PNS_PIPE_ENABLE_UTID;
+ req = PNS_PEP_ENABLE_REQ;
+ } else {
+ utid = PNS_PIPE_DISABLE_UTID;
+ req = PNS_PEP_DISABLE_REQ;
}
-
- return ret;
+ return pipe_handler_send_req(sk, pn->pn_sk.sobject, utid, req,
+ pn->pipe_handle, GFP_ATOMIC);
}
static int pipe_handler_create_pipe(struct sock *sk, int pipe_handle, int cmd)
@@ -1187,23 +1178,6 @@ static int pep_setsockopt(struct sock *sk, int level, int optname,
break;
}
- case PNPIPE_ENABLE:
- if (pn->pipe_state != PIPE_DISABLED) {
- err = -EFAULT;
- break;
- }
- err = pipe_handler_enable_pipe(sk, PNPIPE_ENABLE);
- break;
-
- case PNPIPE_DISABLE:
- if (pn->pipe_state != PIPE_ENABLED) {
- err = -EFAULT;
- break;
- }
-
- err = pipe_handler_enable_pipe(sk, PNPIPE_DISABLE);
- break;
-
case PNPIPE_DESTROY:
if (pn->pipe_state < PIPE_DISABLED) {
err = -EFAULT;
@@ -1239,6 +1213,17 @@ static int pep_setsockopt(struct sock *sk, int level, int optname,
err = 0;
}
goto out_norel;
+
+#ifdef CONFIG_PHONET_PIPECTRLR
+ case PNPIPE_ENABLE:
+ if (pn->pipe_state <= PIPE_IDLE) {
+ err = -ENOTCONN;
+ break;
+ }
+ err = pipe_handler_enable_pipe(sk, val);
+ break;
+#endif
+
default:
err = -ENOPROTOOPT;
}
@@ -1264,15 +1249,18 @@ static int pep_getsockopt(struct sock *sk, int level, int optname,
val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
break;
+ case PNPIPE_IFINDEX:
+ val = pn->ifindex;
+ break;
+
#ifdef CONFIG_PHONET_PIPECTRLR
- case PNPIPE_INQ:
- val = pn->pipe_state;
+ case PNPIPE_ENABLE:
+ if (pn->pipe_state <= PIPE_IDLE)
+ return -ENOTCONN;
+ val = pn->pipe_state != PIPE_DISABLED;
break;
#endif
- case PNPIPE_IFINDEX:
- val = pn->ifindex;
- break;
default:
return -ENOPROTOOPT;
}
--
1.7.0.4
--
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