STRUCT ETHTOOL_AH_ESPIP4_SPEC(9)

✨ STRUCT ETHTOOL_AH_ESPIP4_SPEC ✨

okay so bestie, welcome to the Kernel API Manual 💅 this little cutie lives in struct ethtool_ah_espip4_spec and tbh it's giving flow specification for IPsec/IPv4 👑

🌸 NAME 🌸

struct ethtool_ah_espip4_spec — literally a flow specification for IPsec/IPv4, no cap 🎀

🦋 SYNOPSIS 🦋

struct ethtool_ah_espip4_spec {
    __be32 ip4src;
    __be32 ip4dst;
    __be32 spi;
    __u8 tos;
 };

like… look at her. four fields. main character energy fr fr ✨

💖 Members 💖

• ip4src — the source host, aka where the packet's coming from 🏠
• ip4dst — the destination host, aka where it's headed 🛬
• spi — Security parameters index, the whole vibe check for your IPsec session 🔐
• tos — Type-of-service, the little priority tag it wears 🌈

🧚 Description 🧚

This one can be used to specify an IPsec transport or tunnel over IPv4 — yep, both, she's flexible 💅 use it to lay out exactly what an IPv4 IPsec flow should look like, periodt ✨

ngl this struct is small but she's highkey doing important work in the ethtool flow-spec universe 🫶

👑 SEE ALSO 👑

• Kernel file ./include/uapi/linux/ethtool.h 📁
• struct ethtool_cmd(9)
• struct ethtool_drvinfo(9)
• struct ethtool_wolinfo(9)
• struct ethtool_regs(9)
• struct ethtool_eeprom(9)
• struct ethtool_eee(9)
• struct ethtool_modinfo(9)
• struct ethtool_coalesce(9)
• struct ethtool_ringparam(9)
• struct ethtool_channels(9)
• struct ethtool_pauseparam(9)
• enum ethtool_stringset(9)
• enum ethtool_mac_stats_src(9)
• enum ethtool_module_power_mode_policy(9)
• enum ethtool_module_power_mode(9)
• enum ethtool_c33_pse_ext_state(9)
• enum ethtool_c33_pse_ext_substate_mr_mps_valid(9)
• enum ethtool_c33_pse_ext_substate_error_condition(9)
• enum ethtool_c33_pse_ext_substate_mr_pse_enable(9)
• enum ethtool_c33_pse_ext_substate_option_detect_ted(9)
• enum ethtool_c33_pse_ext_substate_option_vport_lim(9)
• enum ethtool_c33_pse_ext_substate_ovld_detected(9)
• enum ethtool_c33_pse_ext_substate_power_not_available(9)
• enum ethtool_c33_pse_ext_substate_short_detected(9)
• enum ethtool_pse_types(9)
• enum ethtool_c33_pse_admin_state(9)
• enum ethtool_c33_pse_pw_d_status(9)
• enum ethtool_podl_pse_admin_state(9)
• enum ethtool_podl_pse_pw_d_status(9)
• enum ethtool_mm_verify_status(9)
• enum ethtool_module_fw_flash_status(9)
• struct ethtool_gstrings(9)
• struct ethtool_sset_info(9)
• enum ethtool_test_flags(9)
• struct ethtool_test(9)
• struct ethtool_stats(9)
• struct ethtool_perm_addr(9)
• struct ethtool_tcpip4_spec(9)
• struct ethtool_usrip4_spec(9)
• struct ethtool_tcpip6_spec(9)
• struct ethtool_ah_espip6_spec(9)
• struct ethtool_usrip6_spec(9)
• struct ethtool_flow_ext(9)
• struct ethtool_rx_flow_spec(9)
• struct ethtool_rxnfc(9)
• struct ethtool_rxfh_indir(9)
• struct ethtool_rxfh(9)
• struct ethtool_rx_ntuple_flow_spec(9)
• struct ethtool_rx_ntuple(9)
• struct ethtool_dump(9)
• struct ethtool_get_features_block(9)
• struct ethtool_gfeatures(9)
• struct ethtool_set_features_block(9)
• struct ethtool_sfeatures(9)
• struct ethtool_ts_info(9)
• struct ethtool_per_queue_op(9)
• struct ethtool_fecparam(9)
• enum ethtool_fec_config_bits(9)
• struct ethtool_link_settings(9)
• enum phy_upstream(9)

like, that's a whole friend group and she knows every single one of them 🫶

okay that's the whole page bestie, ily, go read some source 💜 this one's filed under ./include/uapi/linux, from the October 2026 drop, and yes the manual name is still struct etht..._espip4_spec(9) because some of us abbreviate when things get long 😭 mwah, slay, bye 💅✨