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a7e454542b
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
174 lines
3.6 KiB
C
174 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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BNEP protocol definition for Linux Bluetooth stack (BlueZ).
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Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
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*/
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#ifndef _BNEP_H
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#define _BNEP_H
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#include <linux/types.h>
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#include <linux/crc32.h>
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#include <net/bluetooth/bluetooth.h>
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/* Limits */
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#define BNEP_MAX_PROTO_FILTERS 5
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#define BNEP_MAX_MULTICAST_FILTERS 20
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/* UUIDs */
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#define BNEP_BASE_UUID 0x0000000000001000800000805F9B34FB
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#define BNEP_UUID16 0x02
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#define BNEP_UUID32 0x04
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#define BNEP_UUID128 0x16
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#define BNEP_SVC_PANU 0x1115
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#define BNEP_SVC_NAP 0x1116
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#define BNEP_SVC_GN 0x1117
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/* Packet types */
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#define BNEP_GENERAL 0x00
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#define BNEP_CONTROL 0x01
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#define BNEP_COMPRESSED 0x02
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#define BNEP_COMPRESSED_SRC_ONLY 0x03
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#define BNEP_COMPRESSED_DST_ONLY 0x04
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/* Control types */
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#define BNEP_CMD_NOT_UNDERSTOOD 0x00
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#define BNEP_SETUP_CONN_REQ 0x01
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#define BNEP_SETUP_CONN_RSP 0x02
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#define BNEP_FILTER_NET_TYPE_SET 0x03
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#define BNEP_FILTER_NET_TYPE_RSP 0x04
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#define BNEP_FILTER_MULTI_ADDR_SET 0x05
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#define BNEP_FILTER_MULTI_ADDR_RSP 0x06
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/* Extension types */
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#define BNEP_EXT_CONTROL 0x00
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/* Response messages */
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#define BNEP_SUCCESS 0x00
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#define BNEP_CONN_INVALID_DST 0x01
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#define BNEP_CONN_INVALID_SRC 0x02
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#define BNEP_CONN_INVALID_SVC 0x03
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#define BNEP_CONN_NOT_ALLOWED 0x04
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#define BNEP_FILTER_UNSUPPORTED_REQ 0x01
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#define BNEP_FILTER_INVALID_RANGE 0x02
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#define BNEP_FILTER_INVALID_MCADDR 0x02
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#define BNEP_FILTER_LIMIT_REACHED 0x03
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#define BNEP_FILTER_DENIED_SECURITY 0x04
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/* L2CAP settings */
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#define BNEP_MTU 1691
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#define BNEP_PSM 0x0f
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#define BNEP_FLUSH_TO 0xffff
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#define BNEP_CONNECT_TO 15
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#define BNEP_FILTER_TO 15
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/* Headers */
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#define BNEP_TYPE_MASK 0x7f
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#define BNEP_EXT_HEADER 0x80
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struct bnep_setup_conn_req {
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__u8 type;
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__u8 ctrl;
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__u8 uuid_size;
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__u8 service[];
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} __packed;
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struct bnep_set_filter_req {
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__u8 type;
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__u8 ctrl;
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__be16 len;
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__u8 list[];
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} __packed;
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struct bnep_control_rsp {
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__u8 type;
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__u8 ctrl;
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__be16 resp;
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} __packed;
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struct bnep_ext_hdr {
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__u8 type;
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__u8 len;
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__u8 data[];
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} __packed;
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/* BNEP ioctl defines */
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#define BNEPCONNADD _IOW('B', 200, int)
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#define BNEPCONNDEL _IOW('B', 201, int)
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#define BNEPGETCONNLIST _IOR('B', 210, int)
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#define BNEPGETCONNINFO _IOR('B', 211, int)
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#define BNEPGETSUPPFEAT _IOR('B', 212, int)
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#define BNEP_SETUP_RESPONSE 0
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#define BNEP_SETUP_RSP_SENT 10
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struct bnep_connadd_req {
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int sock; /* Connected socket */
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__u32 flags;
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__u16 role;
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char device[16]; /* Name of the Ethernet device */
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};
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struct bnep_conndel_req {
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__u32 flags;
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__u8 dst[ETH_ALEN];
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};
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struct bnep_conninfo {
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__u32 flags;
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__u16 role;
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__u16 state;
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__u8 dst[ETH_ALEN];
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char device[16];
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};
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struct bnep_connlist_req {
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__u32 cnum;
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struct bnep_conninfo __user *ci;
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};
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struct bnep_proto_filter {
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__u16 start;
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__u16 end;
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};
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int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock);
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int bnep_del_connection(struct bnep_conndel_req *req);
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int bnep_get_connlist(struct bnep_connlist_req *req);
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int bnep_get_conninfo(struct bnep_conninfo *ci);
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/* BNEP sessions */
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struct bnep_session {
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struct list_head list;
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unsigned int role;
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unsigned long state;
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unsigned long flags;
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atomic_t terminate;
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struct task_struct *task;
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struct ethhdr eh;
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struct msghdr msg;
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struct bnep_proto_filter proto_filter[BNEP_MAX_PROTO_FILTERS];
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unsigned long long mc_filter;
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struct socket *sock;
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struct net_device *dev;
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};
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void bnep_net_setup(struct net_device *dev);
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int bnep_sock_init(void);
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void bnep_sock_cleanup(void);
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static inline int bnep_mc_hash(__u8 *addr)
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{
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return crc32_be(~0, addr, ETH_ALEN) >> 26;
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}
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#endif
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