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# GNU GENERAL PUBLIC LICENSE, Version 2 | ||
# | ||
# Copyright (C) 2017, 6WIND S.A. | ||
# | ||
# This program is free software; you can redistribute it and/or modify | ||
# it under the terms of the GNU General Public License as published by | ||
# the Free Software Foundation; either version 2 of the License, or | ||
# (at your option) any later version. | ||
# | ||
# This program is distributed in the hope that it will be useful, | ||
# but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
# GNU General Public License for more details. | ||
# | ||
# You should have received a copy of the GNU General Public License along | ||
# with this program; if not, write to the Free Software Foundation, Inc., | ||
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | ||
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tokenbucket.o: tokenbucket.c bpf_api.h bpf_elf.h opp.h proto.h | ||
clang -O2 -emit-llvm -c $< -o - | llc -march=bpf -filetype=obj -o $@ | ||
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.PHONY: clean | ||
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clean: | ||
rm -f tokenbucket.o |
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#ifndef __BPF_API__ | ||
#define __BPF_API__ | ||
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/* Note: | ||
* | ||
* This file can be included into eBPF kernel programs. It contains | ||
* a couple of useful helper functions, map/section ABI (bpf_elf.h), | ||
* misc macros and some eBPF specific LLVM built-ins. | ||
*/ | ||
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#include <stdint.h> | ||
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#include <linux/pkt_cls.h> | ||
#include <linux/bpf.h> | ||
#include <linux/filter.h> | ||
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#include <asm/byteorder.h> | ||
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#include "bpf_elf.h" | ||
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/** Misc macros. */ | ||
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#ifndef __stringify | ||
# define __stringify(X) #X | ||
#endif | ||
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#ifndef __maybe_unused | ||
# define __maybe_unused __attribute__((__unused__)) | ||
#endif | ||
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#ifndef offsetof | ||
# define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER) | ||
#endif | ||
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#ifndef likely | ||
# define likely(X) __builtin_expect(!!(X), 1) | ||
#endif | ||
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#ifndef unlikely | ||
# define unlikely(X) __builtin_expect(!!(X), 0) | ||
#endif | ||
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#ifndef htons | ||
# define htons(X) __constant_htons((X)) | ||
#endif | ||
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#ifndef ntohs | ||
# define ntohs(X) __constant_ntohs((X)) | ||
#endif | ||
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#ifndef htonl | ||
# define htonl(X) __constant_htonl((X)) | ||
#endif | ||
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#ifndef ntohl | ||
# define ntohl(X) __constant_ntohl((X)) | ||
#endif | ||
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#ifndef __inline__ | ||
# define __inline__ __attribute__((always_inline)) | ||
#endif | ||
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/** Section helper macros. */ | ||
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#ifndef __section | ||
# define __section(NAME) \ | ||
__attribute__((section(NAME), used)) | ||
#endif | ||
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#ifndef __section_tail | ||
# define __section_tail(ID, KEY) \ | ||
__section(__stringify(ID) "/" __stringify(KEY)) | ||
#endif | ||
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#ifndef __section_xdp_entry | ||
# define __section_xdp_entry \ | ||
__section(ELF_SECTION_PROG) | ||
#endif | ||
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#ifndef __section_cls_entry | ||
# define __section_cls_entry \ | ||
__section(ELF_SECTION_CLASSIFIER) | ||
#endif | ||
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#ifndef __section_act_entry | ||
# define __section_act_entry \ | ||
__section(ELF_SECTION_ACTION) | ||
#endif | ||
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#ifndef __section_lwt_entry | ||
# define __section_lwt_entry \ | ||
__section(ELF_SECTION_PROG) | ||
#endif | ||
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#ifndef __section_license | ||
# define __section_license \ | ||
__section(ELF_SECTION_LICENSE) | ||
#endif | ||
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#ifndef __section_maps | ||
# define __section_maps \ | ||
__section(ELF_SECTION_MAPS) | ||
#endif | ||
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/** Declaration helper macros. */ | ||
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#ifndef BPF_LICENSE | ||
# define BPF_LICENSE(NAME) \ | ||
char ____license[] __section_license = NAME | ||
#endif | ||
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/** Classifier helper */ | ||
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#ifndef BPF_H_DEFAULT | ||
# define BPF_H_DEFAULT -1 | ||
#endif | ||
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/** BPF helper functions for tc. Individual flags are in linux/bpf.h */ | ||
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#ifndef __BPF_FUNC | ||
# define __BPF_FUNC(NAME, ...) \ | ||
(* NAME)(__VA_ARGS__) __maybe_unused | ||
#endif | ||
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#ifndef BPF_FUNC | ||
# define BPF_FUNC(NAME, ...) \ | ||
__BPF_FUNC(NAME, __VA_ARGS__) = (void *) BPF_FUNC_##NAME | ||
#endif | ||
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/* Map access/manipulation */ | ||
static void *BPF_FUNC(map_lookup_elem, void *map, const void *key); | ||
static int BPF_FUNC(map_update_elem, void *map, const void *key, | ||
const void *value, uint32_t flags); | ||
static int BPF_FUNC(map_delete_elem, void *map, const void *key); | ||
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/* Time access */ | ||
static uint64_t BPF_FUNC(ktime_get_ns); | ||
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/* Debugging */ | ||
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/* FIXME: __attribute__ ((format(printf, 1, 3))) not possible unless | ||
* llvm bug https://llvm.org/bugs/show_bug.cgi?id=26243 gets resolved. | ||
* It would require ____fmt to be made const, which generates a reloc | ||
* entry (non-map). | ||
*/ | ||
static void BPF_FUNC(trace_printk, const char *fmt, int fmt_size, ...); | ||
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#ifndef printt | ||
# define printt(fmt, ...) \ | ||
({ \ | ||
char ____fmt[] = fmt; \ | ||
trace_printk(____fmt, sizeof(____fmt), ##__VA_ARGS__); \ | ||
}) | ||
#endif | ||
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/* Random numbers */ | ||
static uint32_t BPF_FUNC(get_prandom_u32); | ||
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/* Tail calls */ | ||
static void BPF_FUNC(tail_call, struct __sk_buff *skb, void *map, | ||
uint32_t index); | ||
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/* System helpers */ | ||
static uint32_t BPF_FUNC(get_smp_processor_id); | ||
static uint32_t BPF_FUNC(get_numa_node_id); | ||
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/* Packet misc meta data */ | ||
static uint32_t BPF_FUNC(get_cgroup_classid, struct __sk_buff *skb); | ||
static int BPF_FUNC(skb_under_cgroup, void *map, uint32_t index); | ||
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static uint32_t BPF_FUNC(get_route_realm, struct __sk_buff *skb); | ||
static uint32_t BPF_FUNC(get_hash_recalc, struct __sk_buff *skb); | ||
static uint32_t BPF_FUNC(set_hash_invalid, struct __sk_buff *skb); | ||
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/* Packet redirection */ | ||
static int BPF_FUNC(redirect, int ifindex, uint32_t flags); | ||
static int BPF_FUNC(clone_redirect, struct __sk_buff *skb, int ifindex, | ||
uint32_t flags); | ||
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/* Packet manipulation */ | ||
static int BPF_FUNC(skb_load_bytes, struct __sk_buff *skb, uint32_t off, | ||
void *to, uint32_t len); | ||
static int BPF_FUNC(skb_store_bytes, struct __sk_buff *skb, uint32_t off, | ||
const void *from, uint32_t len, uint32_t flags); | ||
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static int BPF_FUNC(l3_csum_replace, struct __sk_buff *skb, uint32_t off, | ||
uint32_t from, uint32_t to, uint32_t flags); | ||
static int BPF_FUNC(l4_csum_replace, struct __sk_buff *skb, uint32_t off, | ||
uint32_t from, uint32_t to, uint32_t flags); | ||
static int BPF_FUNC(csum_diff, const void *from, uint32_t from_size, | ||
const void *to, uint32_t to_size, uint32_t seed); | ||
static int BPF_FUNC(csum_update, struct __sk_buff *skb, uint32_t wsum); | ||
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static int BPF_FUNC(skb_change_type, struct __sk_buff *skb, uint32_t type); | ||
static int BPF_FUNC(skb_change_proto, struct __sk_buff *skb, uint32_t proto, | ||
uint32_t flags); | ||
static int BPF_FUNC(skb_change_tail, struct __sk_buff *skb, uint32_t nlen, | ||
uint32_t flags); | ||
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static int BPF_FUNC(skb_pull_data, struct __sk_buff *skb, uint32_t len); | ||
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/* Event notification */ | ||
static int __BPF_FUNC(skb_event_output, struct __sk_buff *skb, void *map, | ||
uint64_t index, const void *data, uint32_t size) = | ||
(void *) BPF_FUNC_perf_event_output; | ||
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/* Packet vlan encap/decap */ | ||
static int BPF_FUNC(skb_vlan_push, struct __sk_buff *skb, uint16_t proto, | ||
uint16_t vlan_tci); | ||
static int BPF_FUNC(skb_vlan_pop, struct __sk_buff *skb); | ||
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/* Packet tunnel encap/decap */ | ||
static int BPF_FUNC(skb_get_tunnel_key, struct __sk_buff *skb, | ||
struct bpf_tunnel_key *to, uint32_t size, uint32_t flags); | ||
static int BPF_FUNC(skb_set_tunnel_key, struct __sk_buff *skb, | ||
const struct bpf_tunnel_key *from, uint32_t size, | ||
uint32_t flags); | ||
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static int BPF_FUNC(skb_get_tunnel_opt, struct __sk_buff *skb, | ||
void *to, uint32_t size); | ||
static int BPF_FUNC(skb_set_tunnel_opt, struct __sk_buff *skb, | ||
const void *from, uint32_t size); | ||
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/** LLVM built-ins, mem*() routines work for constant size */ | ||
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#ifndef lock_xadd | ||
# define lock_xadd(ptr, val) ((void) __sync_fetch_and_add(ptr, val)) | ||
#endif | ||
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#ifndef memset | ||
# define memset(s, c, n) __builtin_memset((s), (c), (n)) | ||
#endif | ||
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#ifndef memcpy | ||
# define memcpy(d, s, n) __builtin_memcpy((d), (s), (n)) | ||
#endif | ||
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#ifndef memmove | ||
# define memmove(d, s, n) __builtin_memmove((d), (s), (n)) | ||
#endif | ||
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/* FIXME: __builtin_memcmp() is not yet fully useable unless llvm bug | ||
* https://llvm.org/bugs/show_bug.cgi?id=26218 gets resolved. Also | ||
* this one would generate a reloc entry (non-map), otherwise. | ||
*/ | ||
#if 0 | ||
#ifndef memcmp | ||
# define memcmp(a, b, n) __builtin_memcmp((a), (b), (n)) | ||
#endif | ||
#endif | ||
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unsigned long long load_byte(void *skb, unsigned long long off) | ||
asm ("llvm.bpf.load.byte"); | ||
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unsigned long long load_half(void *skb, unsigned long long off) | ||
asm ("llvm.bpf.load.half"); | ||
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unsigned long long load_word(void *skb, unsigned long long off) | ||
asm ("llvm.bpf.load.word"); | ||
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#endif /* __BPF_API__ */ |
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#ifndef __BPF_ELF__ | ||
#define __BPF_ELF__ | ||
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#include <asm/types.h> | ||
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/* Note: | ||
* | ||
* Below ELF section names and bpf_elf_map structure definition | ||
* are not (!) kernel ABI. It's rather a "contract" between the | ||
* application and the BPF loader in tc. For compatibility, the | ||
* section names should stay as-is. Introduction of aliases, if | ||
* needed, are a possibility, though. | ||
*/ | ||
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/* ELF section names, etc */ | ||
#define ELF_SECTION_LICENSE "license" | ||
#define ELF_SECTION_MAPS "maps" | ||
#define ELF_SECTION_PROG "prog" | ||
#define ELF_SECTION_CLASSIFIER "classifier" | ||
#define ELF_SECTION_ACTION "action" | ||
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#define ELF_MAX_MAPS 64 | ||
#define ELF_MAX_LICENSE_LEN 128 | ||
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/* Object pinning settings */ | ||
#define PIN_NONE 0 | ||
#define PIN_OBJECT_NS 1 | ||
#define PIN_GLOBAL_NS 2 | ||
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/* ELF map definition */ | ||
struct bpf_elf_map { | ||
__u32 type; | ||
__u32 size_key; | ||
__u32 size_value; | ||
__u32 max_elem; | ||
__u32 flags; | ||
__u32 id; | ||
__u32 pinning; | ||
}; | ||
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#endif /* __BPF_ELF__ */ |
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