mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![David S. Miller](/assets/img/avatar_default.png)
Honestly all the conflicts were simple overlapping changes, nothing really interesting to report. Signed-off-by: David S. Miller <davem@davemloft.net>
687 lines
16 KiB
C
687 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <libelf.h>
|
|
#include <gelf.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include <linux/bpf.h>
|
|
#include <linux/filter.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <poll.h>
|
|
#include <ctype.h>
|
|
#include <assert.h>
|
|
#include <bpf/bpf.h>
|
|
#include "bpf_load.h"
|
|
#include "perf-sys.h"
|
|
|
|
#define DEBUGFS "/sys/kernel/debug/tracing/"
|
|
|
|
static char license[128];
|
|
static int kern_version;
|
|
static bool processed_sec[128];
|
|
char bpf_log_buf[BPF_LOG_BUF_SIZE];
|
|
int map_fd[MAX_MAPS];
|
|
int prog_fd[MAX_PROGS];
|
|
int event_fd[MAX_PROGS];
|
|
int prog_cnt;
|
|
int prog_array_fd = -1;
|
|
|
|
struct bpf_map_data map_data[MAX_MAPS];
|
|
int map_data_count;
|
|
|
|
static int populate_prog_array(const char *event, int prog_fd)
|
|
{
|
|
int ind = atoi(event), err;
|
|
|
|
err = bpf_map_update_elem(prog_array_fd, &ind, &prog_fd, BPF_ANY);
|
|
if (err < 0) {
|
|
printf("failed to store prog_fd in prog_array\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int write_kprobe_events(const char *val)
|
|
{
|
|
int fd, ret, flags;
|
|
|
|
if (val == NULL)
|
|
return -1;
|
|
else if (val[0] == '\0')
|
|
flags = O_WRONLY | O_TRUNC;
|
|
else
|
|
flags = O_WRONLY | O_APPEND;
|
|
|
|
fd = open(DEBUGFS "kprobe_events", flags);
|
|
|
|
ret = write(fd, val, strlen(val));
|
|
close(fd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
|
|
{
|
|
bool is_socket = strncmp(event, "socket", 6) == 0;
|
|
bool is_kprobe = strncmp(event, "kprobe/", 7) == 0;
|
|
bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0;
|
|
bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0;
|
|
bool is_raw_tracepoint = strncmp(event, "raw_tracepoint/", 15) == 0;
|
|
bool is_xdp = strncmp(event, "xdp", 3) == 0;
|
|
bool is_perf_event = strncmp(event, "perf_event", 10) == 0;
|
|
bool is_cgroup_skb = strncmp(event, "cgroup/skb", 10) == 0;
|
|
bool is_cgroup_sk = strncmp(event, "cgroup/sock", 11) == 0;
|
|
bool is_sockops = strncmp(event, "sockops", 7) == 0;
|
|
bool is_sk_skb = strncmp(event, "sk_skb", 6) == 0;
|
|
bool is_sk_msg = strncmp(event, "sk_msg", 6) == 0;
|
|
size_t insns_cnt = size / sizeof(struct bpf_insn);
|
|
enum bpf_prog_type prog_type;
|
|
char buf[256];
|
|
int fd, efd, err, id;
|
|
struct perf_event_attr attr = {};
|
|
|
|
attr.type = PERF_TYPE_TRACEPOINT;
|
|
attr.sample_type = PERF_SAMPLE_RAW;
|
|
attr.sample_period = 1;
|
|
attr.wakeup_events = 1;
|
|
|
|
if (is_socket) {
|
|
prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
|
|
} else if (is_kprobe || is_kretprobe) {
|
|
prog_type = BPF_PROG_TYPE_KPROBE;
|
|
} else if (is_tracepoint) {
|
|
prog_type = BPF_PROG_TYPE_TRACEPOINT;
|
|
} else if (is_raw_tracepoint) {
|
|
prog_type = BPF_PROG_TYPE_RAW_TRACEPOINT;
|
|
} else if (is_xdp) {
|
|
prog_type = BPF_PROG_TYPE_XDP;
|
|
} else if (is_perf_event) {
|
|
prog_type = BPF_PROG_TYPE_PERF_EVENT;
|
|
} else if (is_cgroup_skb) {
|
|
prog_type = BPF_PROG_TYPE_CGROUP_SKB;
|
|
} else if (is_cgroup_sk) {
|
|
prog_type = BPF_PROG_TYPE_CGROUP_SOCK;
|
|
} else if (is_sockops) {
|
|
prog_type = BPF_PROG_TYPE_SOCK_OPS;
|
|
} else if (is_sk_skb) {
|
|
prog_type = BPF_PROG_TYPE_SK_SKB;
|
|
} else if (is_sk_msg) {
|
|
prog_type = BPF_PROG_TYPE_SK_MSG;
|
|
} else {
|
|
printf("Unknown event '%s'\n", event);
|
|
return -1;
|
|
}
|
|
|
|
if (prog_cnt == MAX_PROGS)
|
|
return -1;
|
|
|
|
fd = bpf_load_program(prog_type, prog, insns_cnt, license, kern_version,
|
|
bpf_log_buf, BPF_LOG_BUF_SIZE);
|
|
if (fd < 0) {
|
|
printf("bpf_load_program() err=%d\n%s", errno, bpf_log_buf);
|
|
return -1;
|
|
}
|
|
|
|
prog_fd[prog_cnt++] = fd;
|
|
|
|
if (is_xdp || is_perf_event || is_cgroup_skb || is_cgroup_sk)
|
|
return 0;
|
|
|
|
if (is_socket || is_sockops || is_sk_skb || is_sk_msg) {
|
|
if (is_socket)
|
|
event += 6;
|
|
else
|
|
event += 7;
|
|
if (*event != '/')
|
|
return 0;
|
|
event++;
|
|
if (!isdigit(*event)) {
|
|
printf("invalid prog number\n");
|
|
return -1;
|
|
}
|
|
return populate_prog_array(event, fd);
|
|
}
|
|
|
|
if (is_raw_tracepoint) {
|
|
efd = bpf_raw_tracepoint_open(event + 15, fd);
|
|
if (efd < 0) {
|
|
printf("tracepoint %s %s\n", event + 15, strerror(errno));
|
|
return -1;
|
|
}
|
|
event_fd[prog_cnt - 1] = efd;
|
|
return 0;
|
|
}
|
|
|
|
if (is_kprobe || is_kretprobe) {
|
|
bool need_normal_check = true;
|
|
const char *event_prefix = "";
|
|
|
|
if (is_kprobe)
|
|
event += 7;
|
|
else
|
|
event += 10;
|
|
|
|
if (*event == 0) {
|
|
printf("event name cannot be empty\n");
|
|
return -1;
|
|
}
|
|
|
|
if (isdigit(*event))
|
|
return populate_prog_array(event, fd);
|
|
|
|
#ifdef __x86_64__
|
|
if (strncmp(event, "sys_", 4) == 0) {
|
|
snprintf(buf, sizeof(buf), "%c:__x64_%s __x64_%s",
|
|
is_kprobe ? 'p' : 'r', event, event);
|
|
err = write_kprobe_events(buf);
|
|
if (err >= 0) {
|
|
need_normal_check = false;
|
|
event_prefix = "__x64_";
|
|
}
|
|
}
|
|
#endif
|
|
if (need_normal_check) {
|
|
snprintf(buf, sizeof(buf), "%c:%s %s",
|
|
is_kprobe ? 'p' : 'r', event, event);
|
|
err = write_kprobe_events(buf);
|
|
if (err < 0) {
|
|
printf("failed to create kprobe '%s' error '%s'\n",
|
|
event, strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
strcpy(buf, DEBUGFS);
|
|
strcat(buf, "events/kprobes/");
|
|
strcat(buf, event_prefix);
|
|
strcat(buf, event);
|
|
strcat(buf, "/id");
|
|
} else if (is_tracepoint) {
|
|
event += 11;
|
|
|
|
if (*event == 0) {
|
|
printf("event name cannot be empty\n");
|
|
return -1;
|
|
}
|
|
strcpy(buf, DEBUGFS);
|
|
strcat(buf, "events/");
|
|
strcat(buf, event);
|
|
strcat(buf, "/id");
|
|
}
|
|
|
|
efd = open(buf, O_RDONLY, 0);
|
|
if (efd < 0) {
|
|
printf("failed to open event %s\n", event);
|
|
return -1;
|
|
}
|
|
|
|
err = read(efd, buf, sizeof(buf));
|
|
if (err < 0 || err >= sizeof(buf)) {
|
|
printf("read from '%s' failed '%s'\n", event, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
close(efd);
|
|
|
|
buf[err] = 0;
|
|
id = atoi(buf);
|
|
attr.config = id;
|
|
|
|
efd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
|
|
if (efd < 0) {
|
|
printf("event %d fd %d err %s\n", id, efd, strerror(errno));
|
|
return -1;
|
|
}
|
|
event_fd[prog_cnt - 1] = efd;
|
|
err = ioctl(efd, PERF_EVENT_IOC_ENABLE, 0);
|
|
if (err < 0) {
|
|
printf("ioctl PERF_EVENT_IOC_ENABLE failed err %s\n",
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
err = ioctl(efd, PERF_EVENT_IOC_SET_BPF, fd);
|
|
if (err < 0) {
|
|
printf("ioctl PERF_EVENT_IOC_SET_BPF failed err %s\n",
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int load_maps(struct bpf_map_data *maps, int nr_maps,
|
|
fixup_map_cb fixup_map)
|
|
{
|
|
int i, numa_node;
|
|
|
|
for (i = 0; i < nr_maps; i++) {
|
|
if (fixup_map) {
|
|
fixup_map(&maps[i], i);
|
|
/* Allow userspace to assign map FD prior to creation */
|
|
if (maps[i].fd != -1) {
|
|
map_fd[i] = maps[i].fd;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
numa_node = maps[i].def.map_flags & BPF_F_NUMA_NODE ?
|
|
maps[i].def.numa_node : -1;
|
|
|
|
if (maps[i].def.type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
|
|
maps[i].def.type == BPF_MAP_TYPE_HASH_OF_MAPS) {
|
|
int inner_map_fd = map_fd[maps[i].def.inner_map_idx];
|
|
|
|
map_fd[i] = bpf_create_map_in_map_node(maps[i].def.type,
|
|
maps[i].name,
|
|
maps[i].def.key_size,
|
|
inner_map_fd,
|
|
maps[i].def.max_entries,
|
|
maps[i].def.map_flags,
|
|
numa_node);
|
|
} else {
|
|
map_fd[i] = bpf_create_map_node(maps[i].def.type,
|
|
maps[i].name,
|
|
maps[i].def.key_size,
|
|
maps[i].def.value_size,
|
|
maps[i].def.max_entries,
|
|
maps[i].def.map_flags,
|
|
numa_node);
|
|
}
|
|
if (map_fd[i] < 0) {
|
|
printf("failed to create map %d (%s): %d %s\n",
|
|
i, maps[i].name, errno, strerror(errno));
|
|
return 1;
|
|
}
|
|
maps[i].fd = map_fd[i];
|
|
|
|
if (maps[i].def.type == BPF_MAP_TYPE_PROG_ARRAY)
|
|
prog_array_fd = map_fd[i];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int get_sec(Elf *elf, int i, GElf_Ehdr *ehdr, char **shname,
|
|
GElf_Shdr *shdr, Elf_Data **data)
|
|
{
|
|
Elf_Scn *scn;
|
|
|
|
scn = elf_getscn(elf, i);
|
|
if (!scn)
|
|
return 1;
|
|
|
|
if (gelf_getshdr(scn, shdr) != shdr)
|
|
return 2;
|
|
|
|
*shname = elf_strptr(elf, ehdr->e_shstrndx, shdr->sh_name);
|
|
if (!*shname || !shdr->sh_size)
|
|
return 3;
|
|
|
|
*data = elf_getdata(scn, 0);
|
|
if (!*data || elf_getdata(scn, *data) != NULL)
|
|
return 4;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_relo_and_apply(Elf_Data *data, Elf_Data *symbols,
|
|
GElf_Shdr *shdr, struct bpf_insn *insn,
|
|
struct bpf_map_data *maps, int nr_maps)
|
|
{
|
|
int i, nrels;
|
|
|
|
nrels = shdr->sh_size / shdr->sh_entsize;
|
|
|
|
for (i = 0; i < nrels; i++) {
|
|
GElf_Sym sym;
|
|
GElf_Rel rel;
|
|
unsigned int insn_idx;
|
|
bool match = false;
|
|
int j, map_idx;
|
|
|
|
gelf_getrel(data, i, &rel);
|
|
|
|
insn_idx = rel.r_offset / sizeof(struct bpf_insn);
|
|
|
|
gelf_getsym(symbols, GELF_R_SYM(rel.r_info), &sym);
|
|
|
|
if (insn[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) {
|
|
printf("invalid relo for insn[%d].code 0x%x\n",
|
|
insn_idx, insn[insn_idx].code);
|
|
return 1;
|
|
}
|
|
insn[insn_idx].src_reg = BPF_PSEUDO_MAP_FD;
|
|
|
|
/* Match FD relocation against recorded map_data[] offset */
|
|
for (map_idx = 0; map_idx < nr_maps; map_idx++) {
|
|
if (maps[map_idx].elf_offset == sym.st_value) {
|
|
match = true;
|
|
break;
|
|
}
|
|
}
|
|
if (match) {
|
|
insn[insn_idx].imm = maps[map_idx].fd;
|
|
} else {
|
|
printf("invalid relo for insn[%d] no map_data match\n",
|
|
insn_idx);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_symbols(const void *l, const void *r)
|
|
{
|
|
const GElf_Sym *lsym = (const GElf_Sym *)l;
|
|
const GElf_Sym *rsym = (const GElf_Sym *)r;
|
|
|
|
if (lsym->st_value < rsym->st_value)
|
|
return -1;
|
|
else if (lsym->st_value > rsym->st_value)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int load_elf_maps_section(struct bpf_map_data *maps, int maps_shndx,
|
|
Elf *elf, Elf_Data *symbols, int strtabidx)
|
|
{
|
|
int map_sz_elf, map_sz_copy;
|
|
bool validate_zero = false;
|
|
Elf_Data *data_maps;
|
|
int i, nr_maps;
|
|
GElf_Sym *sym;
|
|
Elf_Scn *scn;
|
|
int copy_sz;
|
|
|
|
if (maps_shndx < 0)
|
|
return -EINVAL;
|
|
if (!symbols)
|
|
return -EINVAL;
|
|
|
|
/* Get data for maps section via elf index */
|
|
scn = elf_getscn(elf, maps_shndx);
|
|
if (scn)
|
|
data_maps = elf_getdata(scn, NULL);
|
|
if (!scn || !data_maps) {
|
|
printf("Failed to get Elf_Data from maps section %d\n",
|
|
maps_shndx);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* For each map get corrosponding symbol table entry */
|
|
sym = calloc(MAX_MAPS+1, sizeof(GElf_Sym));
|
|
for (i = 0, nr_maps = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) {
|
|
assert(nr_maps < MAX_MAPS+1);
|
|
if (!gelf_getsym(symbols, i, &sym[nr_maps]))
|
|
continue;
|
|
if (sym[nr_maps].st_shndx != maps_shndx)
|
|
continue;
|
|
/* Only increment iif maps section */
|
|
nr_maps++;
|
|
}
|
|
|
|
/* Align to map_fd[] order, via sort on offset in sym.st_value */
|
|
qsort(sym, nr_maps, sizeof(GElf_Sym), cmp_symbols);
|
|
|
|
/* Keeping compatible with ELF maps section changes
|
|
* ------------------------------------------------
|
|
* The program size of struct bpf_load_map_def is known by loader
|
|
* code, but struct stored in ELF file can be different.
|
|
*
|
|
* Unfortunately sym[i].st_size is zero. To calculate the
|
|
* struct size stored in the ELF file, assume all struct have
|
|
* the same size, and simply divide with number of map
|
|
* symbols.
|
|
*/
|
|
map_sz_elf = data_maps->d_size / nr_maps;
|
|
map_sz_copy = sizeof(struct bpf_load_map_def);
|
|
if (map_sz_elf < map_sz_copy) {
|
|
/*
|
|
* Backward compat, loading older ELF file with
|
|
* smaller struct, keeping remaining bytes zero.
|
|
*/
|
|
map_sz_copy = map_sz_elf;
|
|
} else if (map_sz_elf > map_sz_copy) {
|
|
/*
|
|
* Forward compat, loading newer ELF file with larger
|
|
* struct with unknown features. Assume zero means
|
|
* feature not used. Thus, validate rest of struct
|
|
* data is zero.
|
|
*/
|
|
validate_zero = true;
|
|
}
|
|
|
|
/* Memcpy relevant part of ELF maps data to loader maps */
|
|
for (i = 0; i < nr_maps; i++) {
|
|
struct bpf_load_map_def *def;
|
|
unsigned char *addr, *end;
|
|
const char *map_name;
|
|
size_t offset;
|
|
|
|
map_name = elf_strptr(elf, strtabidx, sym[i].st_name);
|
|
maps[i].name = strdup(map_name);
|
|
if (!maps[i].name) {
|
|
printf("strdup(%s): %s(%d)\n", map_name,
|
|
strerror(errno), errno);
|
|
free(sym);
|
|
return -errno;
|
|
}
|
|
|
|
/* Symbol value is offset into ELF maps section data area */
|
|
offset = sym[i].st_value;
|
|
def = (struct bpf_load_map_def *)(data_maps->d_buf + offset);
|
|
maps[i].elf_offset = offset;
|
|
memset(&maps[i].def, 0, sizeof(struct bpf_load_map_def));
|
|
memcpy(&maps[i].def, def, map_sz_copy);
|
|
|
|
/* Verify no newer features were requested */
|
|
if (validate_zero) {
|
|
addr = (unsigned char *) def + map_sz_copy;
|
|
end = (unsigned char *) def + map_sz_elf;
|
|
for (; addr < end; addr++) {
|
|
if (*addr != 0) {
|
|
free(sym);
|
|
return -EFBIG;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
free(sym);
|
|
return nr_maps;
|
|
}
|
|
|
|
static int do_load_bpf_file(const char *path, fixup_map_cb fixup_map)
|
|
{
|
|
int fd, i, ret, maps_shndx = -1, strtabidx = -1;
|
|
Elf *elf;
|
|
GElf_Ehdr ehdr;
|
|
GElf_Shdr shdr, shdr_prog;
|
|
Elf_Data *data, *data_prog, *data_maps = NULL, *symbols = NULL;
|
|
char *shname, *shname_prog;
|
|
int nr_maps = 0;
|
|
|
|
/* reset global variables */
|
|
kern_version = 0;
|
|
memset(license, 0, sizeof(license));
|
|
memset(processed_sec, 0, sizeof(processed_sec));
|
|
|
|
if (elf_version(EV_CURRENT) == EV_NONE)
|
|
return 1;
|
|
|
|
fd = open(path, O_RDONLY, 0);
|
|
if (fd < 0)
|
|
return 1;
|
|
|
|
elf = elf_begin(fd, ELF_C_READ, NULL);
|
|
|
|
if (!elf)
|
|
return 1;
|
|
|
|
if (gelf_getehdr(elf, &ehdr) != &ehdr)
|
|
return 1;
|
|
|
|
/* clear all kprobes */
|
|
i = write_kprobe_events("");
|
|
|
|
/* scan over all elf sections to get license and map info */
|
|
for (i = 1; i < ehdr.e_shnum; i++) {
|
|
|
|
if (get_sec(elf, i, &ehdr, &shname, &shdr, &data))
|
|
continue;
|
|
|
|
if (0) /* helpful for llvm debugging */
|
|
printf("section %d:%s data %p size %zd link %d flags %d\n",
|
|
i, shname, data->d_buf, data->d_size,
|
|
shdr.sh_link, (int) shdr.sh_flags);
|
|
|
|
if (strcmp(shname, "license") == 0) {
|
|
processed_sec[i] = true;
|
|
memcpy(license, data->d_buf, data->d_size);
|
|
} else if (strcmp(shname, "version") == 0) {
|
|
processed_sec[i] = true;
|
|
if (data->d_size != sizeof(int)) {
|
|
printf("invalid size of version section %zd\n",
|
|
data->d_size);
|
|
return 1;
|
|
}
|
|
memcpy(&kern_version, data->d_buf, sizeof(int));
|
|
} else if (strcmp(shname, "maps") == 0) {
|
|
int j;
|
|
|
|
maps_shndx = i;
|
|
data_maps = data;
|
|
for (j = 0; j < MAX_MAPS; j++)
|
|
map_data[j].fd = -1;
|
|
} else if (shdr.sh_type == SHT_SYMTAB) {
|
|
strtabidx = shdr.sh_link;
|
|
symbols = data;
|
|
}
|
|
}
|
|
|
|
ret = 1;
|
|
|
|
if (!symbols) {
|
|
printf("missing SHT_SYMTAB section\n");
|
|
goto done;
|
|
}
|
|
|
|
if (data_maps) {
|
|
nr_maps = load_elf_maps_section(map_data, maps_shndx,
|
|
elf, symbols, strtabidx);
|
|
if (nr_maps < 0) {
|
|
printf("Error: Failed loading ELF maps (errno:%d):%s\n",
|
|
nr_maps, strerror(-nr_maps));
|
|
goto done;
|
|
}
|
|
if (load_maps(map_data, nr_maps, fixup_map))
|
|
goto done;
|
|
map_data_count = nr_maps;
|
|
|
|
processed_sec[maps_shndx] = true;
|
|
}
|
|
|
|
/* process all relo sections, and rewrite bpf insns for maps */
|
|
for (i = 1; i < ehdr.e_shnum; i++) {
|
|
if (processed_sec[i])
|
|
continue;
|
|
|
|
if (get_sec(elf, i, &ehdr, &shname, &shdr, &data))
|
|
continue;
|
|
|
|
if (shdr.sh_type == SHT_REL) {
|
|
struct bpf_insn *insns;
|
|
|
|
/* locate prog sec that need map fixup (relocations) */
|
|
if (get_sec(elf, shdr.sh_info, &ehdr, &shname_prog,
|
|
&shdr_prog, &data_prog))
|
|
continue;
|
|
|
|
if (shdr_prog.sh_type != SHT_PROGBITS ||
|
|
!(shdr_prog.sh_flags & SHF_EXECINSTR))
|
|
continue;
|
|
|
|
insns = (struct bpf_insn *) data_prog->d_buf;
|
|
processed_sec[i] = true; /* relo section */
|
|
|
|
if (parse_relo_and_apply(data, symbols, &shdr, insns,
|
|
map_data, nr_maps))
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* load programs */
|
|
for (i = 1; i < ehdr.e_shnum; i++) {
|
|
|
|
if (processed_sec[i])
|
|
continue;
|
|
|
|
if (get_sec(elf, i, &ehdr, &shname, &shdr, &data))
|
|
continue;
|
|
|
|
if (memcmp(shname, "kprobe/", 7) == 0 ||
|
|
memcmp(shname, "kretprobe/", 10) == 0 ||
|
|
memcmp(shname, "tracepoint/", 11) == 0 ||
|
|
memcmp(shname, "raw_tracepoint/", 15) == 0 ||
|
|
memcmp(shname, "xdp", 3) == 0 ||
|
|
memcmp(shname, "perf_event", 10) == 0 ||
|
|
memcmp(shname, "socket", 6) == 0 ||
|
|
memcmp(shname, "cgroup/", 7) == 0 ||
|
|
memcmp(shname, "sockops", 7) == 0 ||
|
|
memcmp(shname, "sk_skb", 6) == 0 ||
|
|
memcmp(shname, "sk_msg", 6) == 0) {
|
|
ret = load_and_attach(shname, data->d_buf,
|
|
data->d_size);
|
|
if (ret != 0)
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
int load_bpf_file(char *path)
|
|
{
|
|
return do_load_bpf_file(path, NULL);
|
|
}
|
|
|
|
int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map)
|
|
{
|
|
return do_load_bpf_file(path, fixup_map);
|
|
}
|
|
|
|
void read_trace_pipe(void)
|
|
{
|
|
int trace_fd;
|
|
|
|
trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0);
|
|
if (trace_fd < 0)
|
|
return;
|
|
|
|
while (1) {
|
|
static char buf[4096];
|
|
ssize_t sz;
|
|
|
|
sz = read(trace_fd, buf, sizeof(buf) - 1);
|
|
if (sz > 0) {
|
|
buf[sz] = 0;
|
|
puts(buf);
|
|
}
|
|
}
|
|
}
|