ip6_dst_lookup(9)

💫 ip6_dst_lookup(9) — the kernel API manual, bestie edition 💫

Okay so welcome to ip6_dst_lookup(9), the little IPv6 route-lookup bestie from the kernel API manual. She's got one job and she ate, honestly. Let's get into it 🎀

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✨ NAME ✨

ip6_dst_lookup — perform route lookup on flow

Like, that's the whole vibe. You hand her a flow, she goes and finds the route. Main character energy fr fr 👑

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🌸 SYNOPSIS 🌸

int ip6_dst_lookup (struct net *net , struct sock *sk , struct dst_entry
**dst , struct flowi6 *fl6 );

That's the signature, verbatim, no cap. Copy it exactly, don't be out here renaming things 💅

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🦋 ARGUMENTS 🦋

• net — the network namespace you wanna do the lookup in. That's her whole world, lowkey 🌈
• sk — the socket that provides the route info. She's the one with the lore 🫶
• dst — pointer to a dst_entry * where the result goes. It's giving "hold my answer" energy ✨
• fl6 — the flow to look up. This is the actual thing being looked up, iconic 💖

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💜 DESCRIPTION 💜

So basically: this function performs a route lookup on the given flow. That's it, that's the plot 🍓

It returns zero on success, or a standard errno code on error. Zero = slay, nonzero = something went sideways, no cap 😭

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🔥 SEE ALSO 🔥

• Kernel file ./net/ipv6/ip6_output.c — that's where she lives 🏡
• ip6_dst_lookup_flow(9)
• ip6_sk_dst_lookup_flow(9)

The whole friend group, honestly. Read all three, iykyk 💀

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Real talk bestie: this page is from ./net/ipv6, dated October 2026, and yes the header still says ip6_dst_lookup(9) because that's her name and she's keeping it. Byeee, go look up some routes 🧚💖⭐