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-rw-r--r--net/sunrpc/xprtsock.c52
1 files changed, 49 insertions, 3 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index e1859614601..8975c10591c 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -270,6 +270,12 @@ struct sock_xprt {
#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
#define TCP_RCV_COPY_XID (1UL << 2)
#define TCP_RCV_COPY_DATA (1UL << 3)
+#define TCP_RCV_COPY_CALLDIR (1UL << 4)
+
+/*
+ * TCP RPC flags
+ */
+#define TCP_RPC_REPLY (1UL << 5)
static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
{
@@ -956,7 +962,7 @@ static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_rea
transport->tcp_offset = 0;
/* Sanity check of the record length */
- if (unlikely(transport->tcp_reclen < 4)) {
+ if (unlikely(transport->tcp_reclen < 8)) {
dprintk("RPC: invalid TCP record fragment length\n");
xprt_force_disconnect(xprt);
return;
@@ -991,13 +997,48 @@ static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_r
if (used != len)
return;
transport->tcp_flags &= ~TCP_RCV_COPY_XID;
- transport->tcp_flags |= TCP_RCV_COPY_DATA;
+ transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
transport->tcp_copied = 4;
- dprintk("RPC: reading reply for XID %08x\n",
+ dprintk("RPC: reading %s XID %08x\n",
+ (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
+ : "request with",
ntohl(transport->tcp_xid));
xs_tcp_check_fraghdr(transport);
}
+static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
+ struct xdr_skb_reader *desc)
+{
+ size_t len, used;
+ u32 offset;
+ __be32 calldir;
+
+ /*
+ * We want transport->tcp_offset to be 8 at the end of this routine
+ * (4 bytes for the xid and 4 bytes for the call/reply flag).
+ * When this function is called for the first time,
+ * transport->tcp_offset is 4 (after having already read the xid).
+ */
+ offset = transport->tcp_offset - sizeof(transport->tcp_xid);
+ len = sizeof(calldir) - offset;
+ dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
+ used = xdr_skb_read_bits(desc, &calldir, len);
+ transport->tcp_offset += used;
+ if (used != len)
+ return;
+ transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
+ transport->tcp_flags |= TCP_RCV_COPY_DATA;
+ transport->tcp_copied += 4;
+ if (ntohl(calldir) == RPC_REPLY)
+ transport->tcp_flags |= TCP_RPC_REPLY;
+ else
+ transport->tcp_flags &= ~TCP_RPC_REPLY;
+ dprintk("RPC: reading %s CALL/REPLY flag %08x\n",
+ (transport->tcp_flags & TCP_RPC_REPLY) ?
+ "reply for" : "request with", calldir);
+ xs_tcp_check_fraghdr(transport);
+}
+
static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
{
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
@@ -1114,6 +1155,11 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns
xs_tcp_read_xid(transport, &desc);
continue;
}
+ /* Read in the call/reply flag */
+ if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
+ xs_tcp_read_calldir(transport, &desc);
+ continue;
+ }
/* Read in the request data */
if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
xs_tcp_read_request(xprt, &desc);