net/core/pktgen.c

File Facts

System

Linux kernel

Corpus path

net/core/pktgen.c

Extension

.c

Size

103994 bytes

Lines

4135

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/sys.h
• linux/types.h
• linux/minmax.h
• linux/module.h
• linux/moduleparam.h
• linux/kernel.h
• linux/mutex.h
• linux/sched.h
• linux/slab.h
• linux/vmalloc.h
• linux/unistd.h
• linux/string.h
• linux/ptrace.h
• linux/errno.h
• linux/hex.h
• linux/ioport.h
• linux/interrupt.h
• linux/capability.h
• linux/hrtimer.h
• linux/freezer.h
• linux/delay.h
• linux/timer.h
• linux/list.h
• linux/init.h
• linux/skbuff.h
• linux/netdevice.h
• linux/inet.h
• linux/inetdevice.h
• linux/rtnetlink.h
• linux/if_arp.h
• linux/if_vlan.h
• linux/in.h

Detected Declarations

• struct imix_pkt
• struct flow_state
• struct pktgen_dev
• struct pktgen_hdr
• struct pktgen_net
• struct pktgen_thread
• enum pkt_flags
• function pgctrl_show
• function pgctrl_write
• function pgctrl_open
• function pktgen_if_show
• function hex32_arg
• function count_trail_chars
• function num_arg
• function strn_len
• function get_imix_entries
• function get_labels
• function pktgen_read_flag
• function pktgen_if_write
• function pktgen_if_open
• function pktgen_thread_show
• function pktgen_thread_write
• function pktgen_thread_open
• function list_for_each_entry
• function pktgen_mark_device
• function pktgen_change_name
• function list_for_each_entry
• function list_for_each_entry
• function pktgen_device_event
• function pktgen_setup_dev
• function pktgen_setup_inject
• function list_for_each_entry
• function spin
• function set_pkt_overhead
• function f_seen
• function f_pick
• function get_ipsec_sa
• function set_cur_queue_map
• function mod_cur_headers
• function fill_imix_distribution
• function pktgen_output_ipsec
• function free_SAs
• function process_ipsec
• function mpls_push
• function build_tci
• function pktgen_finalize_skb
• function pktgen_clear_counters
• function pktgen_run

Annotated Snippet

module_init(pg_init);
module_exit(pg_cleanup);

MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
MODULE_DESCRIPTION("Packet Generator tool");
MODULE_LICENSE("GPL");
MODULE_VERSION(VERSION);
module_param(pg_count_d, int, 0);
MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
module_param(pg_delay_d, int, 0);
MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
module_param(pg_clone_skb_d, int, 0);
MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");

Annotation

• Immediate include surface: `linux/sys.h`, `linux/types.h`, `linux/minmax.h`, `linux/module.h`, `linux/moduleparam.h`, `linux/kernel.h`, `linux/mutex.h`, `linux/sched.h`.
• Detected declarations: `struct imix_pkt`, `struct flow_state`, `struct pktgen_dev`, `struct pktgen_hdr`, `struct pktgen_net`, `struct pktgen_thread`, `enum pkt_flags`, `function pgctrl_show`, `function pgctrl_write`, `function pgctrl_open`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.