batadv_bla_rx(9)

💅 batadv_bla_rx(9) — the Kernel API Manual, but make it make sense

okay bestie, welcome to the Kernel API Manual, section 9. today's main character is batadv_bla_rx — the bridge loop avoidance receive-side vibe check. yes, the whole function name is the title, we don't make the rules 🌸

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✨ NAME ✨

batadv_bla_rx — check packets coming from the mesh. that's it, that's the job. it's giving bouncer at the club door 💅

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🦋 SYNOPSIS 🦋

bool batadv_bla_rx (struct batadv_priv *bat_priv , struct sk_buff *skb ,
unsigned short vid , int packet_type );

look at her. four arguments, one bool return, zero notes. iconic 👑

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🎀 ARGUMENTS 🎀

• bat_priv — the bat priv with all the mesh interface information. yes girl, it's the one with everything in it. the whole mesh's business, in one struct, lowkey terrifying 🫶
• skb — the frame to be checked. this is the little packet that walked in and now has to explain itself 😭
• vid — the VLAN ID of the frame. gotta know which lane she's in 🦋
• packet_type — the batman packet type this frame came in. which flavor of batman are we dealing with, fr fr 🦇

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💖 DESCRIPTION 💖

so batadv_bla_rx is doing bridge loop avoidance (that's the BLA, iykyk) and it checks two things:

• do we have to race for a claim? like, is somebody out here competing for the same claim, and are we about to have a moment 🏃‍♀️💨
• is the frame even allowed on the LAN? vibe check. some packets are not on the list 🔥

In these cases, the skb is further handled by this function. she takes over from here, no cap ✨

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🌈 RETURN 🌈

• true — if handled. she's got it, you can go 🫶
• otherwise it returns false, and the caller shall further process the skb. that means you're up next bestie, don't leave the packet hanging 😭

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👑 SEE ALSO 👑

Kernel file ./net/batman-adv/bridge_loop_avoidance.c — the mothership, go read her 📖

and honestly the whole friend group showed up, every single one:

• batadv_choose_claim(9)
• batadv_choose_backbone_gw(9)
• batadv_compare_backbone_gw(9)
• batadv_compare_claim(9)
• batadv_backbone_gw_release(9)
• batadv_backbone_gw_put(9)
• batadv_claim_release(9)
• batadv_claim_put(9)
• batadv_claim_hash_find(9)
• batadv_backbone_hash_find(9)
• batadv_bla_del_backbone_claims(9)
• batadv_bla_send_claim(9)
• batadv_bla_loopdetect_report(9)
• batadv_bla_get_backbone_gw(9)
• batadv_bla_update_own_backbone_gw(9)
• batadv_bla_answer_request(9)
• batadv_bla_send_request(9)
• batadv_bla_send_announce(9)
• batadv_bla_add_claim(9)
• batadv_bla_claim_get_backbone_gw(9)
• batadv_bla_del_claim(9)
• batadv_handle_announce(9)
• batadv_handle_request(9)
• batadv_handle_unclaim(9)
• batadv_handle_claim(9)
• batadv_check_claim_group(9)
• batadv_bla_process_claim(9)
• batadv_bla_purge_backbone_gw(9)
• batadv_bla_purge_claims(9)
• batadv_bla_update_orig_address(9)
• batadv_bla_send_loopdetect(9)
• batadv_bla_status_update(9)
• batadv_bla_periodic_work(9)
• batadv_bla_init(9)
• batadv_bla_check_duplist(9)
• batadv_bla_check_ucast_duplist(9)
• batadv_bla_check_bcast_duplist(9)
• batadv_bla_is_backbone_gw_orig(9)
• batadv_bla_is_backbone_gw(9)
• batadv_bla_free(9)
• batadv_bla_loopdetect_check(9)
• batadv_bla_tx(9)
• batadv_bla_claim_dump_entry(9)
• batadv_bla_claim_dump_bucket(9)
• batadv_bla_claim_dump(9)
• batadv_bla_backbone_dump_entry(9)
• batadv_bla_backbone_dump_bucket(9)
• batadv_bla_backbone_dump(9)
• batadv_bla_check_claim(9)

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✨ and that's the page, bestie ✨ sourced straight from ./net/batman-adv, dated October 2026, still rocking that batadv_bla_rx(9) energy. go forth and check those packets 💜🦋🎀