STRUCT FLOW_DISSECTOR_KEY_PORTS(9)

💅 struct flow_dissector_key_ports — Kernel API Manual ✨

okay so real talk, this page lives in the Kernel API Manual, and it's all about struct flow_dissector_key_ports 🎀 lowkey a tiny little struct with big main character energy. iykyk.

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🌸 NAME 🌸

struct flow_dissector_key_ports — bestie... that's literally it 😭 the original page has no description line after it. just the name, standing there, serving nothing. so we're not gonna invent one, periodt. the struct itself is the whole vibe 💅

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✨ SYNOPSIS ✨

here's the exact shape of it, no cap, don't touch the formatting bestie:

struct flow_dissector_key_ports {
    union {
      __be32 ports;
      struct {
        __be16 src;
        __be16 dst;
      };
    };
 };

so there's a union, and inside that union there's a __be32 ports living alongside an anonymous struct holding __be16 src and __be16 dst. the way that all three share the same memory... iconic 🫶

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👑 Members 👑

• {unnamed_union} — the anonymous union. it's giving mysterious. no name, just vibes 💀
• ports — port numbers of Transport header 🌈 that's the raw __be32 one, seeing both ports at once
• {unnamed_struct} — another anonymous one, this time a struct 🙈 also nameless, also slaying
• src — source port number 💖
• dst — destination port number 🦋

ok real note: src and dst are the two halves of ports because union, so like — same bytes, two ways to look at 'em. that's the whole trick. cute right? 🎀

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💜 SEE ALSO 💜

so the kernel file this bad girl comes from is ./include/net/flow_dissector.h, and the original entry lists a whole struct-family group chat 🫶 — every one of these, we're keeping all of them, no skipping:

• struct flow_dissector_key_control(9)
• struct flow_dissector_key_basic(9)
• struct flow_dissector_key_enc_opts(9)
• struct flow_dissector_key_ipv4_addrs(9)
• struct flow_dissector_key_ipv6_addrs(9)
• struct flow_dissector_key_tipc(9)
• struct flow_dissector_key_addrs(9)
• struct flow_dissector_key_arp(9)
• struct flow_dissector_key_ports_range(9)
• struct flow_dissector_key_icmp(9)
• struct flow_dissector_key_eth_addrs(9)
• struct flow_dissector_key_tcp(9)
• struct flow_dissector_key_ip(9)
• struct flow_dissector_key_meta(9)
• struct flow_dissector_key_ct(9)
• struct flow_dissector_key_hash(9)
• struct flow_dissector_key_num_of_vlans(9)
• struct flow_dissector_key_pppoe(9)
• struct flow_dissector_key_l2tpv3(9)
• struct flow_dissector_key_ipsec(9)
• struct flow_dissector_key_cfm(9)

like, that's the entire friend group bestie, go read them all, they're all struct entries in that same header 🌟

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okay that's the whole page, you ate that 💅 this came out of ./include/net and the version stamp on it is October 2026 — leaving you with a little signed-off kiss from the kernel docs, mwah 🍓💖