[dpdk-dev] [RFC v2] net/memif: allow for full key size in socket name

[Stephen Hemminger <stephen@networkplumber.org>]

The key size for memif is 256 but the unix domain socket structure has
space for 100 bytes. Change it to use a larger buffer and not hard
code the keysize everywhere.

Not sure what purpose of socket is anyway since there is no code
which connects to it in the current tree anyway?

Still and RFC since I have no way to test this.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
v2 - fix checkpatch warnings

 drivers/net/memif/memif_socket.c | 30 +++++++++++++++++++-----------
 drivers/net/memif/memif_socket.h |  4 +++-
 2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/net/memif/memif_socket.c b/drivers/net/memif/memif_socket.c
index 01a935f87c9f..fb69015694ba 100644
--- a/drivers/net/memif/memif_socket.c
+++ b/drivers/net/memif/memif_socket.c
@@ -860,11 +860,16 @@ memif_listener_handler(void *arg)
 		rte_free(cc);
 }
 
+#define MEMIF_SOCKET_UN_SIZE	\
+	(offsetof(struct sockaddr_un, sun_path) + MEMIF_SOCKET_KEY_LEN)
+
 static struct memif_socket *
-memif_socket_create(struct pmd_internals *pmd, char *key, uint8_t listener)
+memif_socket_create(struct pmd_internals *pmd,
+		    const char *key, uint8_t listener)
 {
 	struct memif_socket *sock;
-	struct sockaddr_un un;
+	struct sockaddr_un *un;
+	char un_buf[MEMIF_SOCKET_UN_SIZE];
 	int sockfd;
 	int ret;
 	int on = 1;
@@ -876,23 +881,25 @@ memif_socket_create(struct pmd_internals *pmd, char *key, uint8_t listener)
 	}
 
 	sock->listener = listener;
-	rte_memcpy(sock->filename, key, 256);
+	strlcpy(sock->filename, key, MEMIF_SOCKET_KEY_LEN);
 	TAILQ_INIT(&sock->dev_queue);
 
 	if (listener != 0) {
+
 		sockfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
 		if (sockfd < 0)
 			goto error;
 
-		un.sun_family = AF_UNIX;
-		memcpy(un.sun_path, sock->filename,
-			sizeof(un.sun_path) - 1);
+		memset(un_buf, 0, sizeof(un_buf));
+		un = (struct sockaddr_un *) un_buf;
+		un->sun_family = AF_UNIX;
+		strlcpy(un->sun_path, sock->filename, MEMIF_SOCKET_KEY_LEN);
 
 		ret = setsockopt(sockfd, SOL_SOCKET, SO_PASSCRED, &on,
 				 sizeof(on));
 		if (ret < 0)
 			goto error;
-		ret = bind(sockfd, (struct sockaddr *)&un, sizeof(un));
+		ret = bind(sockfd, (struct sockaddr *)un, MEMIF_SOCKET_UN_SIZE);
 		if (ret < 0)
 			goto error;
 		ret = listen(sockfd, 1);
@@ -928,9 +935,10 @@ static struct rte_hash *
 memif_create_socket_hash(void)
 {
 	struct rte_hash_parameters params = { 0 };
+
 	params.name = MEMIF_SOCKET_HASH_NAME;
 	params.entries = 256;
-	params.key_len = 256;
+	params.key_len = MEMIF_SOCKET_KEY_LEN;;
 	params.hash_func = rte_jhash;
 	params.hash_func_init_val = 0;
 	return rte_hash_create(&params);
@@ -945,7 +953,7 @@ memif_socket_init(struct rte_eth_dev *dev, const char *socket_filename)
 	struct pmd_internals *tmp_pmd;
 	struct rte_hash *hash;
 	int ret;
-	char key[256];
+	char key[MEMIF_SOCKET_KEY_LEN];
 
 	hash = rte_hash_find_existing(MEMIF_SOCKET_HASH_NAME);
 	if (hash == NULL) {
@@ -956,8 +964,8 @@ memif_socket_init(struct rte_eth_dev *dev, const char *socket_filename)
 		}
 	}
 
-	memset(key, 0, 256);
-	rte_memcpy(key, socket_filename, strlen(socket_filename));
+	memset(key, 0, MEMIF_SOCKET_KEY_LEN);
+	strlcpy(key, socket_filename, MEMIF_SOCKET_KEY_LEN);
 	ret = rte_hash_lookup_data(hash, key, (void **)&socket);
 	if (ret < 0) {
 		socket = memif_socket_create(pmd, key,
diff --git a/drivers/net/memif/memif_socket.h b/drivers/net/memif/memif_socket.h
index db293e200961..9f40f8d138bb 100644
--- a/drivers/net/memif/memif_socket.h
+++ b/drivers/net/memif/memif_socket.h
@@ -79,9 +79,11 @@ struct memif_socket_dev_list_elt {
 };
 
 #define MEMIF_SOCKET_HASH_NAME			"memif-sh"
+#define MEMIF_SOCKET_KEY_LEN		256
+
 struct memif_socket {
 	struct rte_intr_handle intr_handle;	/**< interrupt handle */
-	char filename[256];			/**< socket filename */
+	char filename[MEMIF_SOCKET_KEY_LEN];	/**< socket filename */
 
 	TAILQ_HEAD(, memif_socket_dev_list_elt) dev_queue;
 	/**< Queue of devices using this socket */
-- 
2.20.1