include/net/bluetooth/rfcomm.h

File Facts

System

Linux kernel

Corpus path

include/net/bluetooth/rfcomm.h

Extension

.h

Size

9253 bytes

Lines

373

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: implementation source

Status

source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

• Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/refcount.h

Detected Declarations

• struct rfcomm_hdr
• struct rfcomm_cmd
• struct rfcomm_mcc
• struct rfcomm_pn
• struct rfcomm_rpn
• struct rfcomm_rls
• struct rfcomm_msc
• struct rfcomm_session
• struct rfcomm_dlc
• struct sockaddr_rc
• struct rfcomm_conninfo
• struct rfcomm_pinfo
• struct rfcomm_dev_req
• struct rfcomm_dev_info
• struct rfcomm_dev_list_req
• function rfcomm_dlc_hold
• function rfcomm_dlc_put
• function rfcomm_dlc_throttle
• function rfcomm_dlc_unthrottle
• function rfcomm_init_ttys
• function rfcomm_cleanup_ttys

Annotated Snippet

struct rfcomm_hdr {
	u8 addr;
	u8 ctrl;
	u8 len;    /* Actual size can be 2 bytes */
} __packed;

struct rfcomm_cmd {
	u8 addr;
	u8 ctrl;
	u8 len;
	u8 fcs;
} __packed;

struct rfcomm_mcc {
	u8 type;
	u8 len;
} __packed;

struct rfcomm_pn {
	u8  dlci;
	u8  flow_ctrl;
	u8  priority;
	u8  ack_timer;
	__le16 mtu;
	u8  max_retrans;
	u8  credits;
} __packed;

struct rfcomm_rpn {
	u8  dlci;
	u8  bit_rate;
	u8  line_settings;
	u8  flow_ctrl;
	u8  xon_char;
	u8  xoff_char;
	__le16 param_mask;
} __packed;

struct rfcomm_rls {
	u8  dlci;
	u8  status;
} __packed;

struct rfcomm_msc {
	u8  dlci;
	u8  v24_sig;
} __packed;

/* ---- Core structures, flags etc ---- */

struct rfcomm_session {
	struct list_head list;
	struct socket   *sock;
	struct timer_list timer;
	unsigned long    state;
	unsigned long    flags;
	int              initiator;

	/* Default DLC parameters */
	int    cfc;
	uint   mtu;

	struct list_head dlcs;
};

struct rfcomm_dlc {
	struct list_head      list;
	struct rfcomm_session *session;
	struct sk_buff_head   tx_queue;
	struct timer_list     timer;

	struct mutex  lock;
	unsigned long state;
	unsigned long flags;
	refcount_t    refcnt;
	u8            dlci;
	u8            addr;
	u8            priority;
	u8            v24_sig;
	u8            remote_v24_sig;
	u8            mscex;
	u8            out;
	u8            sec_level;
	u8            role_switch;
	u32           defer_setup;

	uint          mtu;
	uint          cfc;
	uint          rx_credits;
	uint          tx_credits;

Annotation

• Immediate include surface: `linux/refcount.h`.
• Detected declarations: `struct rfcomm_hdr`, `struct rfcomm_cmd`, `struct rfcomm_mcc`, `struct rfcomm_pn`, `struct rfcomm_rpn`, `struct rfcomm_rls`, `struct rfcomm_msc`, `struct rfcomm_session`, `struct rfcomm_dlc`, `struct sockaddr_rc`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.