dst_cache_get_ip4(9)

💖 dst_cache_get_ip4 💖

okay so welcome to the Kernel API Manual entry for dst_cache_get_ip4, bestie. its whole job is to perform a cache lookup and fetch the ipv4 source address. that's the vibe. ✨

🦋 SYNOPSIS 🦋

here's the exact signature, no cap:

struct rtable * dst_cache_get_ip4 (struct dst_cache *dst_cache , __be32
       *saddr );

it returns a struct rtable *. slay.

🎀 ARGUMENTS 🎀

• dst_cache — the cache. literally the cache you're looking in, bestie. 💅
• saddr — the return value for the retrieved source address. it's the spot where the source address comes back to you. 🫶

💅 DESCRIPTION 💅

okay so the big rule: local BH must be disabled. not "maybe", not "if you feel like it" — must. mandatory. periodt. 💀

🌈 SEE ALSO 🌈

go check out the Kernel file ./include/net/dst_cache.h and these iconic besties:

• dst_cache_get(9)
• dst_cache_set_ip4(9)
• dst_cache_set_ip6(9)
• dst_cache_get_ip6(9)
• dst_cache_reset(9)
• dst_cache_reset_now(9)
• dst_cache_init(9)
• dst_cache_destroy(9)

okay bye bestie 💖 this page is from ./include/net, dated October 2026, and it's the dst_cache_get_ip4(9) page — periodt. 🌸