2016-12-01 09:48:05 -07:00
|
|
|
/* eBPF example program:
|
|
|
|
*
|
|
|
|
* - Loads eBPF program
|
|
|
|
*
|
|
|
|
* The eBPF program sets the sk_bound_dev_if index in new AF_INET{6}
|
|
|
|
* sockets opened by processes in the cgroup.
|
|
|
|
*
|
|
|
|
* - Attaches the new program to a cgroup using BPF_PROG_ATTACH
|
|
|
|
*/
|
|
|
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|
|
|
|
#define _GNU_SOURCE
|
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|
|
|
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|
|
#include <stdio.h>
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|
|
#include <stdlib.h>
|
|
|
|
#include <stddef.h>
|
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|
|
#include <string.h>
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|
|
|
#include <unistd.h>
|
|
|
|
#include <assert.h>
|
|
|
|
#include <errno.h>
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|
|
#include <fcntl.h>
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|
|
#include <net/if.h>
|
2017-08-31 16:05:46 -06:00
|
|
|
#include <inttypes.h>
|
2016-12-01 09:48:05 -07:00
|
|
|
#include <linux/bpf.h>
|
2018-05-14 23:35:03 -06:00
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|
|
#include <bpf/bpf.h>
|
2016-12-01 09:48:05 -07:00
|
|
|
|
2018-05-14 23:35:03 -06:00
|
|
|
#include "bpf_insn.h"
|
2016-12-01 09:48:05 -07:00
|
|
|
|
samples/bpf: Make samples more libbpf-centric
Switch all of the sample code to use the function names from
tools/lib/bpf so that they're consistent with that, and to declare their
own log buffers. This allow the next commit to be purely devoted to
getting rid of the duplicate library in samples/bpf.
Committer notes:
Testing it:
On a fedora rawhide container, with clang/llvm 3.9, sharing the host
linux kernel git tree:
# make O=/tmp/build/linux/ headers_install
# make O=/tmp/build/linux -C samples/bpf/
Since I forgot to make it privileged, just tested it outside the
container, using what it generated:
# uname -a
Linux jouet 4.9.0-rc8+ #1 SMP Mon Dec 12 11:20:49 BRT 2016 x86_64 x86_64 x86_64 GNU/Linux
# cd /var/lib/docker/devicemapper/mnt/c43e09a53ff56c86a07baf79847f00e2cc2a17a1e2220e1adbf8cbc62734feda/rootfs/tmp/build/linux/samples/bpf/
# ls -la offwaketime
-rwxr-xr-x. 1 root root 24200 Dec 15 12:19 offwaketime
# file offwaketime
offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c940d3f127d5e66cdd680e42d885cb0b64f8a0e4, not stripped
# readelf -SW offwaketime_kern.o | grep PROGBITS
[ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
[ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8
[ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8
[ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4
[ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1
[ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4
# ./offwaketime | head -5
swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 106
CPU 0/KVM;entry_SYSCALL_64_fastpath;sys_ioctl;do_vfs_ioctl;kvm_vcpu_ioctl;kvm_arch_vcpu_ioctl_run;kvm_vcpu_block;schedule;__schedule;-;try_to_wake_up;swake_up_locked;swake_up;apic_timer_expired;apic_timer_fn;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary;;swapper/3 2
Compositor;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;futex_requeue;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;SoftwareVsyncTh 5
firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 13
JS Helper;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;firefox 2
#
Signed-off-by: Joe Stringer <joe@ovn.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-12-14 15:43:38 -07:00
|
|
|
char bpf_log_buf[BPF_LOG_BUF_SIZE];
|
|
|
|
|
2017-08-31 16:05:46 -06:00
|
|
|
static int prog_load(__u32 idx, __u32 mark, __u32 prio)
|
2016-12-01 09:48:05 -07:00
|
|
|
{
|
2017-08-31 16:05:46 -06:00
|
|
|
/* save pointer to context */
|
|
|
|
struct bpf_insn prog_start[] = {
|
2016-12-01 09:48:05 -07:00
|
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
2017-08-31 16:05:46 -06:00
|
|
|
};
|
|
|
|
struct bpf_insn prog_end[] = {
|
|
|
|
BPF_MOV64_IMM(BPF_REG_0, 1), /* r0 = verdict */
|
|
|
|
BPF_EXIT_INSN(),
|
|
|
|
};
|
|
|
|
|
|
|
|
/* set sk_bound_dev_if on socket */
|
|
|
|
struct bpf_insn prog_dev[] = {
|
2016-12-01 09:48:05 -07:00
|
|
|
BPF_MOV64_IMM(BPF_REG_3, idx),
|
|
|
|
BPF_MOV64_IMM(BPF_REG_2, offsetof(struct bpf_sock, bound_dev_if)),
|
|
|
|
BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3, offsetof(struct bpf_sock, bound_dev_if)),
|
|
|
|
};
|
|
|
|
|
2017-08-31 16:05:46 -06:00
|
|
|
/* set mark on socket */
|
|
|
|
struct bpf_insn prog_mark[] = {
|
2017-08-31 16:05:50 -06:00
|
|
|
/* get uid of process */
|
|
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
|
|
BPF_FUNC_get_current_uid_gid),
|
|
|
|
BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xffffffff),
|
|
|
|
|
|
|
|
/* if uid is 0, use given mark, else use the uid as the mark */
|
|
|
|
BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
|
|
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
2017-08-31 16:05:46 -06:00
|
|
|
BPF_MOV64_IMM(BPF_REG_3, mark),
|
2017-08-31 16:05:50 -06:00
|
|
|
|
|
|
|
/* set the mark on the new socket */
|
|
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
2017-08-31 16:05:46 -06:00
|
|
|
BPF_MOV64_IMM(BPF_REG_2, offsetof(struct bpf_sock, mark)),
|
|
|
|
BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3, offsetof(struct bpf_sock, mark)),
|
|
|
|
};
|
|
|
|
|
|
|
|
/* set priority on socket */
|
|
|
|
struct bpf_insn prog_prio[] = {
|
|
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
|
|
BPF_MOV64_IMM(BPF_REG_3, prio),
|
|
|
|
BPF_MOV64_IMM(BPF_REG_2, offsetof(struct bpf_sock, priority)),
|
|
|
|
BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3, offsetof(struct bpf_sock, priority)),
|
|
|
|
};
|
|
|
|
|
|
|
|
struct bpf_insn *prog;
|
|
|
|
size_t insns_cnt;
|
|
|
|
void *p;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
insns_cnt = sizeof(prog_start) + sizeof(prog_end);
|
|
|
|
if (idx)
|
|
|
|
insns_cnt += sizeof(prog_dev);
|
|
|
|
|
|
|
|
if (mark)
|
|
|
|
insns_cnt += sizeof(prog_mark);
|
|
|
|
|
|
|
|
if (prio)
|
|
|
|
insns_cnt += sizeof(prog_prio);
|
|
|
|
|
|
|
|
p = prog = malloc(insns_cnt);
|
|
|
|
if (!prog) {
|
|
|
|
fprintf(stderr, "Failed to allocate memory for instructions\n");
|
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(p, prog_start, sizeof(prog_start));
|
|
|
|
p += sizeof(prog_start);
|
|
|
|
|
|
|
|
if (idx) {
|
|
|
|
memcpy(p, prog_dev, sizeof(prog_dev));
|
|
|
|
p += sizeof(prog_dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mark) {
|
|
|
|
memcpy(p, prog_mark, sizeof(prog_mark));
|
|
|
|
p += sizeof(prog_mark);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (prio) {
|
|
|
|
memcpy(p, prog_prio, sizeof(prog_prio));
|
|
|
|
p += sizeof(prog_prio);
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(p, prog_end, sizeof(prog_end));
|
|
|
|
p += sizeof(prog_end);
|
|
|
|
|
|
|
|
insns_cnt /= sizeof(struct bpf_insn);
|
|
|
|
|
|
|
|
ret = bpf_load_program(BPF_PROG_TYPE_CGROUP_SOCK, prog, insns_cnt,
|
samples/bpf: Make samples more libbpf-centric
Switch all of the sample code to use the function names from
tools/lib/bpf so that they're consistent with that, and to declare their
own log buffers. This allow the next commit to be purely devoted to
getting rid of the duplicate library in samples/bpf.
Committer notes:
Testing it:
On a fedora rawhide container, with clang/llvm 3.9, sharing the host
linux kernel git tree:
# make O=/tmp/build/linux/ headers_install
# make O=/tmp/build/linux -C samples/bpf/
Since I forgot to make it privileged, just tested it outside the
container, using what it generated:
# uname -a
Linux jouet 4.9.0-rc8+ #1 SMP Mon Dec 12 11:20:49 BRT 2016 x86_64 x86_64 x86_64 GNU/Linux
# cd /var/lib/docker/devicemapper/mnt/c43e09a53ff56c86a07baf79847f00e2cc2a17a1e2220e1adbf8cbc62734feda/rootfs/tmp/build/linux/samples/bpf/
# ls -la offwaketime
-rwxr-xr-x. 1 root root 24200 Dec 15 12:19 offwaketime
# file offwaketime
offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c940d3f127d5e66cdd680e42d885cb0b64f8a0e4, not stripped
# readelf -SW offwaketime_kern.o | grep PROGBITS
[ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
[ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8
[ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8
[ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4
[ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1
[ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4
# ./offwaketime | head -5
swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 106
CPU 0/KVM;entry_SYSCALL_64_fastpath;sys_ioctl;do_vfs_ioctl;kvm_vcpu_ioctl;kvm_arch_vcpu_ioctl_run;kvm_vcpu_block;schedule;__schedule;-;try_to_wake_up;swake_up_locked;swake_up;apic_timer_expired;apic_timer_fn;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary;;swapper/3 2
Compositor;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;futex_requeue;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;SoftwareVsyncTh 5
firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 13
JS Helper;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;firefox 2
#
Signed-off-by: Joe Stringer <joe@ovn.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-12-14 15:43:38 -07:00
|
|
|
"GPL", 0, bpf_log_buf, BPF_LOG_BUF_SIZE);
|
2017-08-31 16:05:46 -06:00
|
|
|
|
|
|
|
free(prog);
|
|
|
|
|
|
|
|
return ret;
|
2016-12-01 09:48:05 -07:00
|
|
|
}
|
|
|
|
|
2017-08-31 16:05:48 -06:00
|
|
|
static int get_bind_to_device(int sd, char *name, size_t len)
|
|
|
|
{
|
|
|
|
socklen_t optlen = len;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
name[0] = '\0';
|
|
|
|
rc = getsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, name, &optlen);
|
|
|
|
if (rc < 0)
|
|
|
|
perror("setsockopt(SO_BINDTODEVICE)");
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int get_somark(int sd)
|
|
|
|
{
|
|
|
|
unsigned int mark = 0;
|
|
|
|
socklen_t optlen = sizeof(mark);
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = getsockopt(sd, SOL_SOCKET, SO_MARK, &mark, &optlen);
|
|
|
|
if (rc < 0)
|
|
|
|
perror("getsockopt(SO_MARK)");
|
|
|
|
|
|
|
|
return mark;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int get_priority(int sd)
|
|
|
|
{
|
|
|
|
unsigned int prio = 0;
|
|
|
|
socklen_t optlen = sizeof(prio);
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = getsockopt(sd, SOL_SOCKET, SO_PRIORITY, &prio, &optlen);
|
|
|
|
if (rc < 0)
|
|
|
|
perror("getsockopt(SO_PRIORITY)");
|
|
|
|
|
|
|
|
return prio;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int show_sockopts(int family)
|
|
|
|
{
|
|
|
|
unsigned int mark, prio;
|
|
|
|
char name[16];
|
|
|
|
int sd;
|
|
|
|
|
|
|
|
sd = socket(family, SOCK_DGRAM, 17);
|
|
|
|
if (sd < 0) {
|
|
|
|
perror("socket");
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (get_bind_to_device(sd, name, sizeof(name)) < 0)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
mark = get_somark(sd);
|
|
|
|
prio = get_priority(sd);
|
|
|
|
|
|
|
|
close(sd);
|
|
|
|
|
|
|
|
printf("sd %d: dev %s, mark %u, priority %u\n", sd, name, mark, prio);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-12-01 09:48:05 -07:00
|
|
|
static int usage(const char *argv0)
|
|
|
|
{
|
2017-08-31 16:05:47 -06:00
|
|
|
printf("Usage:\n");
|
|
|
|
printf(" Attach a program\n");
|
|
|
|
printf(" %s -b bind-to-dev -m mark -p prio cg-path\n", argv0);
|
|
|
|
printf("\n");
|
|
|
|
printf(" Detach a program\n");
|
|
|
|
printf(" %s -d cg-path\n", argv0);
|
2017-08-31 16:05:48 -06:00
|
|
|
printf("\n");
|
|
|
|
printf(" Show inherited socket settings (mark, priority, and device)\n");
|
|
|
|
printf(" %s [-6]\n", argv0);
|
2016-12-01 09:48:05 -07:00
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
2017-08-31 16:05:46 -06:00
|
|
|
__u32 idx = 0, mark = 0, prio = 0;
|
|
|
|
const char *cgrp_path = NULL;
|
2016-12-01 09:48:05 -07:00
|
|
|
int cg_fd, prog_fd, ret;
|
2017-08-31 16:05:48 -06:00
|
|
|
int family = PF_INET;
|
2017-08-31 16:05:47 -06:00
|
|
|
int do_attach = 1;
|
2017-08-31 16:05:46 -06:00
|
|
|
int rc;
|
|
|
|
|
2017-08-31 16:05:48 -06:00
|
|
|
while ((rc = getopt(argc, argv, "db:m:p:6")) != -1) {
|
2017-08-31 16:05:46 -06:00
|
|
|
switch (rc) {
|
2017-08-31 16:05:47 -06:00
|
|
|
case 'd':
|
|
|
|
do_attach = 0;
|
|
|
|
break;
|
2017-08-31 16:05:46 -06:00
|
|
|
case 'b':
|
|
|
|
idx = if_nametoindex(optarg);
|
|
|
|
if (!idx) {
|
|
|
|
idx = strtoumax(optarg, NULL, 0);
|
|
|
|
if (!idx) {
|
|
|
|
printf("Invalid device name\n");
|
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case 'm':
|
|
|
|
mark = strtoumax(optarg, NULL, 0);
|
|
|
|
break;
|
|
|
|
case 'p':
|
|
|
|
prio = strtoumax(optarg, NULL, 0);
|
|
|
|
break;
|
2017-08-31 16:05:48 -06:00
|
|
|
case '6':
|
|
|
|
family = PF_INET6;
|
|
|
|
break;
|
2017-08-31 16:05:46 -06:00
|
|
|
default:
|
|
|
|
return usage(argv[0]);
|
|
|
|
}
|
|
|
|
}
|
2016-12-01 09:48:05 -07:00
|
|
|
|
2017-08-31 16:05:46 -06:00
|
|
|
if (optind == argc)
|
2017-08-31 16:05:48 -06:00
|
|
|
return show_sockopts(family);
|
2016-12-01 09:48:05 -07:00
|
|
|
|
2017-08-31 16:05:46 -06:00
|
|
|
cgrp_path = argv[optind];
|
|
|
|
if (!cgrp_path) {
|
|
|
|
fprintf(stderr, "cgroup path not given\n");
|
2016-12-01 09:48:05 -07:00
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
|
|
|
|
2017-08-31 16:05:47 -06:00
|
|
|
if (do_attach && !idx && !mark && !prio) {
|
2017-08-31 16:05:46 -06:00
|
|
|
fprintf(stderr,
|
|
|
|
"One of device, mark or priority must be given\n");
|
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
|
|
|
|
|
|
|
cg_fd = open(cgrp_path, O_DIRECTORY | O_RDONLY);
|
2016-12-01 09:48:05 -07:00
|
|
|
if (cg_fd < 0) {
|
|
|
|
printf("Failed to open cgroup path: '%s'\n", strerror(errno));
|
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
|
|
|
|
2017-08-31 16:05:47 -06:00
|
|
|
if (do_attach) {
|
|
|
|
prog_fd = prog_load(idx, mark, prio);
|
|
|
|
if (prog_fd < 0) {
|
|
|
|
printf("Failed to load prog: '%s'\n", strerror(errno));
|
|
|
|
printf("Output from kernel verifier:\n%s\n-------\n",
|
|
|
|
bpf_log_buf);
|
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
2016-12-01 09:48:05 -07:00
|
|
|
|
2017-08-31 16:05:47 -06:00
|
|
|
ret = bpf_prog_attach(prog_fd, cg_fd,
|
|
|
|
BPF_CGROUP_INET_SOCK_CREATE, 0);
|
|
|
|
if (ret < 0) {
|
|
|
|
printf("Failed to attach prog to cgroup: '%s'\n",
|
|
|
|
strerror(errno));
|
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
ret = bpf_prog_detach(cg_fd, BPF_CGROUP_INET_SOCK_CREATE);
|
|
|
|
if (ret < 0) {
|
|
|
|
printf("Failed to detach prog from cgroup: '%s'\n",
|
|
|
|
strerror(errno));
|
|
|
|
return EXIT_FAILURE;
|
|
|
|
}
|
2016-12-01 09:48:05 -07:00
|
|
|
}
|
|
|
|
|
2017-08-31 16:05:47 -06:00
|
|
|
close(cg_fd);
|
2016-12-01 09:48:05 -07:00
|
|
|
return EXIT_SUCCESS;
|
|
|
|
}
|