batadv_skb_head_push(9)

💅 batadv_skb_head_push(9)

okay so bestie, welcome to the Kernel API Manual — this one's batadv_skb_head_push, and it literally does what it says on the tin: it bumps up the header size and pushes that head pointer forward. slay. 🎀

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✨ NAME ✨

batadv_skb_head_push — increase header size and move (push) the head pointer 💫

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🌸 SYNOPSIS 🌸

int batadv_skb_head_push (struct sk_buff *skb , unsigned int len );

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🦋 ARGUMENTS 🦋

• skb — the packet buffer that's getting modified, that's her, she's the main character 🌈
• len — how many bytes you wanna add. the number. the amount. periodt 💅

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🔥 DESCRIPTION 🔥

⚠️ warning bestie, read this twice: this function may reallocate the skb data buffer via skb_cow_head/...

and like… what that means is if you grabbed any pointer into the skb data before this call — think something you got from skb->data or eth_hdr — you gotta consider it invalid afterwards. gone. expired. no cap. 😭 you literally have to reacquire it, there is no workaround, this is not a drill.

so like, don't be out here holding onto stale pointers, it's giving undefined behavior energy and we don't do that 🙈

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👑 RETURN 👑

• 0 on success 🎉
• a negative error number if it fails 💀

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🧚 SEE ALSO 🧚

kernel file ./net/batman-adv/mesh-interface.c, plus the whole friend group:

• batadv_sum_counter(9)
• batadv_interface_stats(9)
• batadv_interface_set_mac_addr(9)
• batadv_interface_change_mtu(9)
• batadv_interface_set_rx_mode(9)
• batadv_interface_tx(9)
• batadv_interface_rx(9)
• batadv_meshif_vlan_release(9)
• batadv_meshif_vlan_get(9)
• batadv_meshif_create_vlan(9)
• batadv_meshif_destroy_vlan(9)
• batadv_interface_add_vid(9)
• batadv_interface_kill_vid(9)
• batadv_set_lockdep_class_one(9)
• batadv_set_lockdep_class(9)
• batadv_meshif_init_late(9)
• batadv_meshif_slave_add(9)
• batadv_meshif_slave_del(9)
• batadv_get_drvinfo(9)
• batadv_get_strings(9)
• batadv_get_ethtool_stats(9)
• batadv_get_sset_count(9)
• batadv_meshif_free(9)
• batadv_meshif_init_early(9)
• batadv_meshif_validate(9)
• batadv_meshif_newlink(9)
• batadv_meshif_destroy_netlink(9)
• batadv_meshif_is_valid(9)

like… that's a lot of siblings, but they're all iconic in their own way 🫶

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mwah 💋 this page came from ./net/batman-adv, dated October 2026, and it's the batadv_skb_head_push(9) manual — go forth and reacquire your pointers, bestie, ily ⭐