net/core/flow_dissector.c

File Facts

System

Linux kernel

Corpus path

net/core/flow_dissector.c

Extension

.c

Size

57484 bytes

Lines

2099

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.
• 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/kernel.h
• linux/skbuff.h
• linux/export.h
• linux/ip.h
• linux/ipv6.h
• linux/if_vlan.h
• linux/filter.h
• net/dsa.h
• net/dst_metadata.h
• net/ip.h
• net/ipv6.h
• net/gre.h
• net/pptp.h
• net/tipc.h
• linux/igmp.h
• linux/icmp.h
• linux/sctp.h
• linux/dccp.h
• linux/if_tunnel.h
• linux/if_pppox.h
• linux/ppp_defs.h
• linux/stddef.h
• linux/if_ether.h
• linux/if_hsr.h
• linux/mpls.h
• linux/tcp.h
• linux/ptp_classify.h
• net/flow_dissector.h
• net/pkt_cls.h
• scsi/fc/fc_fcoe.h
• uapi/linux/batadv_packet.h
• linux/bpf.h

Detected Declarations

• struct _flow_keys_digest_data
• function dissector_set_key
• function skb_flow_dissector_init
• function flow_dissector_bpf_prog_attach_check
• function for_each_net
• function skb_flow_get_ports
• function icmp_has_id
• function skb_flow_get_icmp_tci
• function skb_flow_get_icmp_tci
• function __skb_flow_dissect_ah
• function __skb_flow_dissect_esp
• function __skb_flow_dissect_l2tpv3
• function skb_flow_dissect_meta
• function skb_flow_dissect_set_enc_control
• function skb_flow_dissect_ct
• function skb_flow_dissect_tunnel_info
• function skb_flow_dissect_hash
• function __skb_flow_dissect_mpls
• function __skb_flow_dissect_arp
• function __skb_flow_dissect_cfm
• function __skb_flow_dissect_gre
• function __skb_flow_dissect_batadv
• function __skb_flow_dissect_tcp
• function __skb_flow_dissect_ports
• function __skb_flow_dissect_ipv4
• function __skb_flow_dissect_ipv6
• function skb_flow_dissect_allowed
• function __skb_flow_bpf_to_target
• function dissector_uses_key
• function bpf_flow_dissect
• function is_pppoe_ses_hdr_valid
• function __skb_flow_dissect
• function htons
• function __flow_hash_secret_init
• function flow_keys_hash_length
• function flow_get_u32_src
• function flow_get_u32_dst
• function __flow_hash_consistentify
• function __flow_hash_from_keys
• function flow_hash_from_keys
• function flow_hash_from_keys_seed
• function ___skb_get_hash
• function make_flow_keys_digest
• function __skb_get_hash_symmetric_net
• function __skb_get_hash_net
• function skb_get_hash_perturb
• function __skb_get_poff
• function skb_get_poff

Annotated Snippet

core_initcall(init_default_flow_dissectors);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/skbuff.h`, `linux/export.h`, `linux/ip.h`, `linux/ipv6.h`, `linux/if_vlan.h`, `linux/filter.h`, `net/dsa.h`.
• Detected declarations: `struct _flow_keys_digest_data`, `function dissector_set_key`, `function skb_flow_dissector_init`, `function flow_dissector_bpf_prog_attach_check`, `function for_each_net`, `function skb_flow_get_ports`, `function icmp_has_id`, `function skb_flow_get_icmp_tci`, `function skb_flow_get_icmp_tci`, `function __skb_flow_dissect_ah`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration 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.