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authorAl Viro <viro@zeniv.linux.org.uk>2015-04-11 21:51:09 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-11 21:51:09 +0200
commita2dd3793a1c3ac709f1d7b48ad7751563f4c654f (patch)
tree81280559aad138fe997a3b4af205729093927b81 /net
parentget rid of the size argument of sock_sendmsg() (diff)
parentkafs: Add more "unified AFS" error codes (diff)
downloadlinux-a2dd3793a1c3ac709f1d7b48ad7751563f4c654f.tar.xz
linux-a2dd3793a1c3ac709f1d7b48ad7751563f4c654f.zip
Merge remote-tracking branch 'dh/afs' into for-davem
Diffstat (limited to 'net')
-rw-r--r--net/rxrpc/ar-input.c23
-rw-r--r--net/rxrpc/ar-internal.h2
-rw-r--r--net/rxrpc/ar-local.c98
-rw-r--r--net/rxrpc/ar-output.c54
4 files changed, 148 insertions, 29 deletions
diff --git a/net/rxrpc/ar-input.c b/net/rxrpc/ar-input.c
index 481f89f93789..4505a691d88c 100644
--- a/net/rxrpc/ar-input.c
+++ b/net/rxrpc/ar-input.c
@@ -28,7 +28,7 @@
const char *rxrpc_pkts[] = {
"?00",
"DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
- "?09", "?10", "?11", "?12", "?13", "?14", "?15"
+ "?09", "?10", "?11", "?12", "VERSION", "?14", "?15"
};
/*
@@ -593,6 +593,20 @@ static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
rxrpc_queue_conn(conn);
}
+/*
+ * post endpoint-level events to the local endpoint
+ * - this includes debug and version messages
+ */
+static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
+ struct sk_buff *skb)
+{
+ _enter("%p,%p", local, skb);
+
+ atomic_inc(&local->usage);
+ skb_queue_tail(&local->event_queue, skb);
+ rxrpc_queue_work(&local->event_processor);
+}
+
static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local,
struct sk_buff *skb,
struct rxrpc_skb_priv *sp)
@@ -699,6 +713,11 @@ void rxrpc_data_ready(struct sock *sk)
goto bad_message;
}
+ if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) {
+ rxrpc_post_packet_to_local(local, skb);
+ goto out;
+ }
+
if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
(sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
goto bad_message;
@@ -731,6 +750,8 @@ void rxrpc_data_ready(struct sock *sk)
else
goto cant_route_call;
}
+
+out:
rxrpc_put_local(local);
return;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 2fc1e659e5c9..aef1bd294e17 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -152,11 +152,13 @@ struct rxrpc_local {
struct work_struct destroyer; /* endpoint destroyer */
struct work_struct acceptor; /* incoming call processor */
struct work_struct rejecter; /* packet reject writer */
+ struct work_struct event_processor; /* endpoint event processor */
struct list_head services; /* services listening on this endpoint */
struct list_head link; /* link in endpoint list */
struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
struct sk_buff_head accept_queue; /* incoming calls awaiting acceptance */
struct sk_buff_head reject_queue; /* packets awaiting rejection */
+ struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
spinlock_t lock; /* access lock */
rwlock_t services_lock; /* lock for services list */
atomic_t usage;
diff --git a/net/rxrpc/ar-local.c b/net/rxrpc/ar-local.c
index 87f7135d238b..ca904ed5400a 100644
--- a/net/rxrpc/ar-local.c
+++ b/net/rxrpc/ar-local.c
@@ -13,16 +13,22 @@
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
+#include <linux/udp.h>
+#include <linux/ip.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
+#include <generated/utsrelease.h>
#include "ar-internal.h"
+static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
+
static LIST_HEAD(rxrpc_locals);
DEFINE_RWLOCK(rxrpc_local_lock);
static DECLARE_RWSEM(rxrpc_local_sem);
static DECLARE_WAIT_QUEUE_HEAD(rxrpc_local_wq);
static void rxrpc_destroy_local(struct work_struct *work);
+static void rxrpc_process_local_events(struct work_struct *work);
/*
* allocate a new local
@@ -37,11 +43,13 @@ struct rxrpc_local *rxrpc_alloc_local(struct sockaddr_rxrpc *srx)
INIT_WORK(&local->destroyer, &rxrpc_destroy_local);
INIT_WORK(&local->acceptor, &rxrpc_accept_incoming_calls);
INIT_WORK(&local->rejecter, &rxrpc_reject_packets);
+ INIT_WORK(&local->event_processor, &rxrpc_process_local_events);
INIT_LIST_HEAD(&local->services);
INIT_LIST_HEAD(&local->link);
init_rwsem(&local->defrag_sem);
skb_queue_head_init(&local->accept_queue);
skb_queue_head_init(&local->reject_queue);
+ skb_queue_head_init(&local->event_queue);
spin_lock_init(&local->lock);
rwlock_init(&local->services_lock);
atomic_set(&local->usage, 1);
@@ -264,10 +272,12 @@ static void rxrpc_destroy_local(struct work_struct *work)
ASSERT(list_empty(&local->services));
ASSERT(!work_pending(&local->acceptor));
ASSERT(!work_pending(&local->rejecter));
+ ASSERT(!work_pending(&local->event_processor));
/* finish cleaning up the local descriptor */
rxrpc_purge_queue(&local->accept_queue);
rxrpc_purge_queue(&local->reject_queue);
+ rxrpc_purge_queue(&local->event_queue);
kernel_sock_shutdown(local->socket, SHUT_RDWR);
sock_release(local->socket);
@@ -308,3 +318,91 @@ void __exit rxrpc_destroy_all_locals(void)
_leave("");
}
+
+/*
+ * Reply to a version request
+ */
+static void rxrpc_send_version_request(struct rxrpc_local *local,
+ struct rxrpc_header *hdr,
+ struct sk_buff *skb)
+{
+ struct sockaddr_in sin;
+ struct msghdr msg;
+ struct kvec iov[2];
+ size_t len;
+ int ret;
+
+ _enter("");
+
+ sin.sin_family = AF_INET;
+ sin.sin_port = udp_hdr(skb)->source;
+ sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+
+ msg.msg_name = &sin;
+ msg.msg_namelen = sizeof(sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ hdr->seq = 0;
+ hdr->serial = 0;
+ hdr->type = RXRPC_PACKET_TYPE_VERSION;
+ hdr->flags = RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
+ hdr->userStatus = 0;
+ hdr->_rsvd = 0;
+
+ iov[0].iov_base = hdr;
+ iov[0].iov_len = sizeof(*hdr);
+ iov[1].iov_base = (char *)rxrpc_version_string;
+ iov[1].iov_len = sizeof(rxrpc_version_string);
+
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ _proto("Tx VERSION (reply)");
+
+ ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
+ if (ret < 0)
+ _debug("sendmsg failed: %d", ret);
+
+ _leave("");
+}
+
+/*
+ * Process event packets targetted at a local endpoint.
+ */
+static void rxrpc_process_local_events(struct work_struct *work)
+{
+ struct rxrpc_local *local = container_of(work, struct rxrpc_local, event_processor);
+ struct sk_buff *skb;
+ char v;
+
+ _enter("");
+
+ atomic_inc(&local->usage);
+
+ while ((skb = skb_dequeue(&local->event_queue))) {
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ kdebug("{%d},{%u}", local->debug_id, sp->hdr.type);
+
+ switch (sp->hdr.type) {
+ case RXRPC_PACKET_TYPE_VERSION:
+ if (skb_copy_bits(skb, 0, &v, 1) < 0)
+ return;
+ _proto("Rx VERSION { %02x }", v);
+ if (v == 0)
+ rxrpc_send_version_request(local, &sp->hdr, skb);
+ break;
+
+ default:
+ /* Just ignore anything we don't understand */
+ break;
+ }
+
+ rxrpc_put_local(local);
+ rxrpc_free_skb(skb);
+ }
+
+ rxrpc_put_local(local);
+ _leave("");
+}
diff --git a/net/rxrpc/ar-output.c b/net/rxrpc/ar-output.c
index 09f584566e23..7a31a3958364 100644
--- a/net/rxrpc/ar-output.c
+++ b/net/rxrpc/ar-output.c
@@ -542,11 +542,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
call->tx_pending = NULL;
copied = 0;
- if (len > iov_iter_count(&msg->msg_iter))
- len = iov_iter_count(&msg->msg_iter);
- while (len) {
- int copy;
-
+ do {
if (!skb) {
size_t size, chunk, max, space;
@@ -568,8 +564,8 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
max &= ~(call->conn->size_align - 1UL);
chunk = max;
- if (chunk > len && !more)
- chunk = len;
+ if (chunk > iov_iter_count(&msg->msg_iter) && !more)
+ chunk = iov_iter_count(&msg->msg_iter);
space = chunk + call->conn->size_align;
space &= ~(call->conn->size_align - 1UL);
@@ -612,23 +608,23 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
sp = rxrpc_skb(skb);
/* append next segment of data to the current buffer */
- copy = skb_tailroom(skb);
- ASSERTCMP(copy, >, 0);
- if (copy > len)
- copy = len;
- if (copy > sp->remain)
- copy = sp->remain;
-
- _debug("add");
- ret = skb_add_data(skb, &msg->msg_iter, copy);
- _debug("added");
- if (ret < 0)
- goto efault;
- sp->remain -= copy;
- skb->mark += copy;
- copied += copy;
-
- len -= copy;
+ if (iov_iter_count(&msg->msg_iter) > 0) {
+ int copy = skb_tailroom(skb);
+ ASSERTCMP(copy, >, 0);
+ if (copy > iov_iter_count(&msg->msg_iter))
+ copy = iov_iter_count(&msg->msg_iter);
+ if (copy > sp->remain)
+ copy = sp->remain;
+
+ _debug("add");
+ ret = skb_add_data(skb, &msg->msg_iter, copy);
+ _debug("added");
+ if (ret < 0)
+ goto efault;
+ sp->remain -= copy;
+ skb->mark += copy;
+ copied += copy;
+ }
/* check for the far side aborting the call or a network error
* occurring */
@@ -636,7 +632,8 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
goto call_aborted;
/* add the packet to the send queue if it's now full */
- if (sp->remain <= 0 || (!len && !more)) {
+ if (sp->remain <= 0 ||
+ (iov_iter_count(&msg->msg_iter) == 0 && !more)) {
struct rxrpc_connection *conn = call->conn;
uint32_t seq;
size_t pad;
@@ -666,7 +663,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
sp->hdr.serviceId = conn->service_id;
sp->hdr.flags = conn->out_clientflag;
- if (len == 0 && !more)
+ if (iov_iter_count(&msg->msg_iter) == 0 && !more)
sp->hdr.flags |= RXRPC_LAST_PACKET;
else if (CIRC_SPACE(call->acks_head, call->acks_tail,
call->acks_winsz) > 1)
@@ -682,10 +679,11 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
memcpy(skb->head, &sp->hdr,
sizeof(struct rxrpc_header));
- rxrpc_queue_packet(call, skb, !iov_iter_count(&msg->msg_iter) && !more);
+ rxrpc_queue_packet(call, skb,
+ iov_iter_count(&msg->msg_iter) == 0 && !more);
skb = NULL;
}
- }
+ } while (iov_iter_count(&msg->msg_iter) > 0);
success:
ret = copied;