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feat(s2n-quic-platform): add ancillary instructions for bpf assembler
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,188 @@ | ||
| // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
|
|
||
| //! Ancillary data extensions are used to look up additional information about a packet | ||
| //! | ||
| //! See <https://docs.kernel.org/networking/filter.html#bpf-engine-and-instruction-set> | ||
| macro_rules! skf_value { | ||
| ($name:ident) => { | ||
| (libc::SKF_AD_OFF + libc::$name) as _ | ||
| }; | ||
| } | ||
|
|
||
| #[derive(Clone, Copy, Debug)] | ||
| pub struct Info { | ||
| /// The special extension name used in `bpf_asm` | ||
| pub extension: &'static str, | ||
| /// The `C` interface | ||
| pub capi: &'static str, | ||
| } | ||
|
|
||
| /// Returns the [`Info`] for a given offset | ||
| pub const fn lookup(offset: u32) -> Option<Info> { | ||
| macro_rules! map { | ||
| ($(($value:expr, $extension:expr, $capi:expr),)*) => { | ||
| match offset { | ||
| $(_ if offset == $value => Some(Info { extension: $extension, capi: $capi }),)* | ||
| _ => None, | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| map!( | ||
| (skb::protocol(), "proto", "skb->protocol"), | ||
| (skb::pkt_type(), "type", "skb->pkt_type"), | ||
| (skb::ifindex(), "ifidx", "skb->dev->ifindex"), | ||
| (skb::mark(), "mark", "skb->mark"), | ||
| (skb::queue_mapping(), "queue", "skb->queue_mapping"), | ||
| (skb::dev_type(), "hatype", "skb->dev->type"), | ||
| (skb::hash(), "rxhash", "skb->hash"), | ||
| (skb::vlan_tci(), "vlan_tci", "skb_vlan_tag_get(skb)"), | ||
| (skb::vlan_avail(), "vlan_avail", "skb_vlan_tag_present(skb)"), | ||
| (skb::vlan_proto(), "vlan_tpid", "skb->vlan_tproto"), | ||
| (payload_offset(), "poff", "payload_offset()"), | ||
| (raw_smp_processor_id(), "cpu", "raw_smp_processor_id()"), | ||
| (get_random_u32(), "rand", "get_random_u32()"), | ||
| ) | ||
| } | ||
|
|
||
| pub mod skb { | ||
| macro_rules! skb_value { | ||
| ($name:ident, $value:ident) => { | ||
| #[inline] | ||
| pub const fn $name() -> u32 { | ||
| skf_value!($value) | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| skb_value!(protocol, SKF_AD_PROTOCOL); | ||
| skb_value!(pkt_type, SKF_AD_PKTTYPE); | ||
| skb_value!(ifindex, SKF_AD_IFINDEX); | ||
| skb_value!(mark, SKF_AD_MARK); | ||
| skb_value!(queue_mapping, SKF_AD_QUEUE); | ||
| skb_value!(dev_type, SKF_AD_HATYPE); | ||
| skb_value!(hash, SKF_AD_RXHASH); | ||
| skb_value!(vlan_tci, SKF_AD_VLAN_TAG); | ||
| skb_value!(vlan_avail, SKF_AD_VLAN_TAG_PRESENT); | ||
| skb_value!(vlan_proto, SKF_AD_VLAN_TPID); | ||
| } | ||
|
|
||
| #[inline] | ||
| pub const fn payload_offset() -> u32 { | ||
| skf_value!(SKF_AD_PAY_OFFSET) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub const fn raw_smp_processor_id() -> u32 { | ||
| skf_value!(SKF_AD_CPU) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub const fn get_random_u32() -> u32 { | ||
| skf_value!(SKF_AD_RANDOM) | ||
| } | ||
|
|
||
| macro_rules! impl_ancillary { | ||
| () => { | ||
| /// Ancillary data extensions are used to look up additional information about a packet | ||
| /// | ||
| /// See <https://docs.kernel.org/networking/filter.html#bpf-engine-and-instruction-set> | ||
| pub mod ancillary { | ||
| use super::{super::ancillary, *}; | ||
|
|
||
| /// Data associated with the socket buffer (skb) | ||
| pub mod skb { | ||
| use super::{ancillary::skb, *}; | ||
|
|
||
| /// Loads the `skb->len` into the `A` register | ||
| pub const fn len() -> K { | ||
| // use the dialect-specific instruction to load the skb len | ||
| // | ||
| // in the case of CBPF, there is a single `Mode` for `LEN` | ||
| super::super::len() | ||
| } | ||
|
|
||
| /// Loads the `skb->protocol` into the `A` register | ||
| pub const fn protocol() -> K { | ||
| abs(skb::protocol()) | ||
| } | ||
|
|
||
| /// Loads the `skb->pkt_type` into the `A` register | ||
| pub const fn pkt_type() -> K { | ||
| abs(skb::pkt_type()) | ||
| } | ||
|
|
||
| /// Loads the `skb->ifindex` into the `A` register | ||
| pub const fn ifindex() -> K { | ||
| abs(skb::ifindex()) | ||
| } | ||
|
|
||
| /// Loads the `skb->mark` into the `A` register | ||
| pub const fn mark() -> K { | ||
| abs(skb::mark()) | ||
| } | ||
|
|
||
| /// Loads the `skb->queue_mapping` into the `A` register | ||
| pub const fn queue_mapping() -> K { | ||
| abs(skb::queue_mapping()) | ||
| } | ||
|
|
||
| /// Loads the `skb->dev->type` into the `A` register | ||
| pub const fn dev_type() -> K { | ||
| abs(skb::dev_type()) | ||
| } | ||
|
|
||
| /// Loads the `skb->hash` into the `A` register | ||
| pub const fn hash() -> K { | ||
| abs(skb::hash()) | ||
| } | ||
|
|
||
| /// Loads the VLAN Tag value into the `A` register | ||
| pub const fn vlan_tci() -> K { | ||
| abs(skb::vlan_tci()) | ||
| } | ||
|
|
||
| /// Loads the VLAN Tag value into the `A` register | ||
| /// | ||
| /// This is used for compatibility with the C API | ||
| pub const fn vlan_tag_get() -> K { | ||
| vlan_tci() | ||
| } | ||
|
|
||
| /// Loads if the VLAN Tag is present into the `A` register | ||
| pub const fn vlan_avail() -> K { | ||
| abs(skb::vlan_avail()) | ||
| } | ||
|
|
||
| /// Loads if the VLAN Tag is present into the `A` register | ||
| /// | ||
| /// This is used for compatibility with the C API | ||
| pub const fn vlan_tag_present() -> K { | ||
| vlan_avail() | ||
| } | ||
|
|
||
| /// Loads the `skb->vlan_proto` (VLAN Protocol) into the `A` register | ||
| pub const fn vlan_proto() -> K { | ||
| abs(skb::vlan_proto()) | ||
| } | ||
| } | ||
|
|
||
| /// Loads the payload offset into the `A` register | ||
| pub const fn payload_offset() -> K { | ||
| abs(ancillary::payload_offset()) | ||
| } | ||
|
|
||
| /// Loads the CPU ID into the `A` register | ||
| pub const fn raw_smp_processor_id() -> K { | ||
| abs(ancillary::raw_smp_processor_id()) | ||
| } | ||
|
|
||
| /// Loads a random `u32` into the `A` register | ||
| pub const fn get_random_u32() -> K { | ||
| abs(ancillary::get_random_u32()) | ||
| } | ||
| } | ||
| }; | ||
| } |
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