mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Kumar Kartikeya Dwivedi](/assets/img/avatar_default.png)
This adds the shared BPF file that will be used going forward for sharing tracepoint programs among XDP redirect samples. Since vmlinux.h conflicts with tools/include for READ_ONCE/WRITE_ONCE and ARRAY_SIZE, they are copied in to xdp_sample.bpf.h along with other helpers that will be required. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210821002010.845777-5-memxor@gmail.com
141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#ifndef _XDP_SAMPLE_BPF_H
|
|
#define _XDP_SAMPLE_BPF_H
|
|
|
|
#include "vmlinux.h"
|
|
#include <bpf/bpf_tracing.h>
|
|
#include <bpf/bpf_core_read.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
#include "xdp_sample_shared.h"
|
|
|
|
#define ETH_ALEN 6
|
|
#define ETH_P_802_3_MIN 0x0600
|
|
#define ETH_P_8021Q 0x8100
|
|
#define ETH_P_8021AD 0x88A8
|
|
#define ETH_P_IP 0x0800
|
|
#define ETH_P_IPV6 0x86DD
|
|
#define ETH_P_ARP 0x0806
|
|
#define IPPROTO_ICMPV6 58
|
|
|
|
#define EINVAL 22
|
|
#define ENETDOWN 100
|
|
#define EMSGSIZE 90
|
|
#define EOPNOTSUPP 95
|
|
#define ENOSPC 28
|
|
|
|
typedef struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__uint(map_flags, BPF_F_MMAPABLE);
|
|
__type(key, unsigned int);
|
|
__type(value, struct datarec);
|
|
} array_map;
|
|
|
|
extern array_map rx_cnt;
|
|
extern const volatile int nr_cpus;
|
|
|
|
enum {
|
|
XDP_REDIRECT_SUCCESS = 0,
|
|
XDP_REDIRECT_ERROR = 1
|
|
};
|
|
|
|
static __always_inline void swap_src_dst_mac(void *data)
|
|
{
|
|
unsigned short *p = data;
|
|
unsigned short dst[3];
|
|
|
|
dst[0] = p[0];
|
|
dst[1] = p[1];
|
|
dst[2] = p[2];
|
|
p[0] = p[3];
|
|
p[1] = p[4];
|
|
p[2] = p[5];
|
|
p[3] = dst[0];
|
|
p[4] = dst[1];
|
|
p[5] = dst[2];
|
|
}
|
|
|
|
#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
|
|
__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
|
|
#define bpf_ntohs(x) __builtin_bswap16(x)
|
|
#define bpf_htons(x) __builtin_bswap16(x)
|
|
#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
|
|
__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
|
|
#define bpf_ntohs(x) (x)
|
|
#define bpf_htons(x) (x)
|
|
#else
|
|
# error "Endianness detection needs to be set up for your compiler?!"
|
|
#endif
|
|
|
|
/*
|
|
* Note: including linux/compiler.h or linux/kernel.h for the macros below
|
|
* conflicts with vmlinux.h include in BPF files, so we define them here.
|
|
*
|
|
* Following functions are taken from kernel sources and
|
|
* break aliasing rules in their original form.
|
|
*
|
|
* While kernel is compiled with -fno-strict-aliasing,
|
|
* perf uses -Wstrict-aliasing=3 which makes build fail
|
|
* under gcc 4.4.
|
|
*
|
|
* Using extra __may_alias__ type to allow aliasing
|
|
* in this case.
|
|
*/
|
|
typedef __u8 __attribute__((__may_alias__)) __u8_alias_t;
|
|
typedef __u16 __attribute__((__may_alias__)) __u16_alias_t;
|
|
typedef __u32 __attribute__((__may_alias__)) __u32_alias_t;
|
|
typedef __u64 __attribute__((__may_alias__)) __u64_alias_t;
|
|
|
|
static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
|
|
{
|
|
switch (size) {
|
|
case 1: *(__u8_alias_t *) res = *(volatile __u8_alias_t *) p; break;
|
|
case 2: *(__u16_alias_t *) res = *(volatile __u16_alias_t *) p; break;
|
|
case 4: *(__u32_alias_t *) res = *(volatile __u32_alias_t *) p; break;
|
|
case 8: *(__u64_alias_t *) res = *(volatile __u64_alias_t *) p; break;
|
|
default:
|
|
asm volatile ("" : : : "memory");
|
|
__builtin_memcpy((void *)res, (const void *)p, size);
|
|
asm volatile ("" : : : "memory");
|
|
}
|
|
}
|
|
|
|
static __always_inline void __write_once_size(volatile void *p, void *res, int size)
|
|
{
|
|
switch (size) {
|
|
case 1: *(volatile __u8_alias_t *) p = *(__u8_alias_t *) res; break;
|
|
case 2: *(volatile __u16_alias_t *) p = *(__u16_alias_t *) res; break;
|
|
case 4: *(volatile __u32_alias_t *) p = *(__u32_alias_t *) res; break;
|
|
case 8: *(volatile __u64_alias_t *) p = *(__u64_alias_t *) res; break;
|
|
default:
|
|
asm volatile ("" : : : "memory");
|
|
__builtin_memcpy((void *)p, (const void *)res, size);
|
|
asm volatile ("" : : : "memory");
|
|
}
|
|
}
|
|
|
|
#define READ_ONCE(x) \
|
|
({ \
|
|
union { typeof(x) __val; char __c[1]; } __u = \
|
|
{ .__c = { 0 } }; \
|
|
__read_once_size(&(x), __u.__c, sizeof(x)); \
|
|
__u.__val; \
|
|
})
|
|
|
|
#define WRITE_ONCE(x, val) \
|
|
({ \
|
|
union { typeof(x) __val; char __c[1]; } __u = \
|
|
{ .__val = (val) }; \
|
|
__write_once_size(&(x), __u.__c, sizeof(x)); \
|
|
__u.__val; \
|
|
})
|
|
|
|
/* Add a value using relaxed read and relaxed write. Less expensive than
|
|
* fetch_add when there is no write concurrency.
|
|
*/
|
|
#define NO_TEAR_ADD(x, val) WRITE_ONCE((x), READ_ONCE(x) + (val))
|
|
#define NO_TEAR_INC(x) NO_TEAR_ADD((x), 1)
|
|
|
|
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
|
|
|
#endif
|