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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

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Daniel Borkmann says:

====================
pull-request: bpf-next 2019-04-28

The following pull-request contains BPF updates for your *net-next* tree.

The main changes are:

1) Introduce BPF socket local storage map so that BPF programs can store
   private data they associate with a socket (instead of e.g. separate hash
   table), from Martin.

2) Add support for bpftool to dump BTF types. This is done through a new
   `bpftool btf dump` sub-command, from Andrii.

3) Enable BPF-based flow dissector for skb-less eth_get_headlen() calls which
   was currently not supported since skb was used to lookup netns, from Stanislav.

4) Add an opt-in interface for tracepoints to expose a writable context
   for attached BPF programs, used here for NBD sockets, from Matt.

5) BPF xadd related arm64 JIT fixes and scalability improvements, from Daniel.

6) Change the skb->protocol for bpf_skb_adjust_room() helper in order to
   support tunnels such as sit. Add selftests as well, from Willem.

7) Various smaller misc fixes.
====================

Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David S. Miller 2019-04-28 08:42:41 -04:00
commit 5f0d736e7f
84 changed files with 4168 additions and 361 deletions
Download patch file Download diff file Expand all files Collapse all files

1
tools/lib/bpf/bpf.h
View file

@ -26,6 +26,7 @@
#include <linux/bpf.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {

106
tools/lib/bpf/libbpf.c
View file

@ -126,6 +126,8 @@ static inline __u64 ptr_to_u64(const void *ptr)
struct bpf_capabilities {
/* v4.14: kernel support for program & map names. */
__u32 name:1;
/* v5.2: kernel support for global data sections. */
__u32 global_data:1;
};
/*
@ -854,12 +856,15 @@ bpf_object__init_maps(struct bpf_object *obj, int flags)
*
* TODO: Detect array of map and report error.
*/
if (obj->efile.data_shndx >= 0)
nr_maps_glob++;
if (obj->efile.rodata_shndx >= 0)
nr_maps_glob++;
if (obj->efile.bss_shndx >= 0)
nr_maps_glob++;
if (obj->caps.global_data) {
if (obj->efile.data_shndx >= 0)
nr_maps_glob++;
if (obj->efile.rodata_shndx >= 0)
nr_maps_glob++;
if (obj->efile.bss_shndx >= 0)
nr_maps_glob++;
}
for (i = 0; data && i < nr_syms; i++) {
GElf_Sym sym;
@ -870,14 +875,14 @@ bpf_object__init_maps(struct bpf_object *obj, int flags)
nr_maps++;
}
/* Alloc obj->maps and fill nr_maps. */
pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path,
nr_maps, data->d_size);
if (!nr_maps && !nr_maps_glob)
return 0;
/* Assume equally sized map definitions */
if (data) {
pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path,
nr_maps, data->d_size);
map_def_sz = data->d_size / nr_maps;
if (!data->d_size || (data->d_size % nr_maps) != 0) {
pr_warning("unable to determine map definition size "
@ -971,6 +976,9 @@ bpf_object__init_maps(struct bpf_object *obj, int flags)
map_idx++;
}
if (!obj->caps.global_data)
goto finalize;
/*
* Populate rest of obj->maps with libbpf internal maps.
*/
@ -988,6 +996,7 @@ bpf_object__init_maps(struct bpf_object *obj, int flags)
ret = bpf_object__init_internal_map(obj, &obj->maps[map_idx++],
LIBBPF_MAP_BSS,
obj->efile.bss, NULL);
finalize:
if (!ret)
qsort(obj->maps, obj->nr_maps, sizeof(obj->maps[0]),
compare_bpf_map);
@ -1333,11 +1342,17 @@ bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr,
if (bpf_object__shndx_is_maps(obj, shdr_idx) ||
bpf_object__shndx_is_data(obj, shdr_idx)) {
type = bpf_object__section_to_libbpf_map_type(obj, shdr_idx);
if (type != LIBBPF_MAP_UNSPEC &&
GELF_ST_BIND(sym.st_info) == STB_GLOBAL) {
pr_warning("bpf: relocation: not yet supported relo for non-static global \'%s\' variable found in insns[%d].code 0x%x\n",
name, insn_idx, insns[insn_idx].code);
return -LIBBPF_ERRNO__RELOC;
if (type != LIBBPF_MAP_UNSPEC) {
if (GELF_ST_BIND(sym.st_info) == STB_GLOBAL) {
pr_warning("bpf: relocation: not yet supported relo for non-static global \'%s\' variable found in insns[%d].code 0x%x\n",
name, insn_idx, insns[insn_idx].code);
return -LIBBPF_ERRNO__RELOC;
}
if (!obj->caps.global_data) {
pr_warning("bpf: relocation: kernel does not support global \'%s\' variable access in insns[%d]\n",
name, insn_idx);
return -LIBBPF_ERRNO__RELOC;
}
}
for (map_idx = 0; map_idx < nr_maps; map_idx++) {
@ -1495,10 +1510,68 @@ bpf_object__probe_name(struct bpf_object *obj)
return 0;
}
static int
bpf_object__probe_global_data(struct bpf_object *obj)
{
struct bpf_load_program_attr prg_attr;
struct bpf_create_map_attr map_attr;
char *cp, errmsg[STRERR_BUFSIZE];
struct bpf_insn insns[] = {
BPF_LD_MAP_VALUE(BPF_REG_1, 0, 16),
BPF_ST_MEM(BPF_DW, BPF_REG_1, 0, 42),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
};
int ret, map;
memset(&map_attr, 0, sizeof(map_attr));
map_attr.map_type = BPF_MAP_TYPE_ARRAY;
map_attr.key_size = sizeof(int);
map_attr.value_size = 32;
map_attr.max_entries = 1;
map = bpf_create_map_xattr(&map_attr);
if (map < 0) {
cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
pr_warning("Error in %s():%s(%d). Couldn't create simple array map.\n",
__func__, cp, errno);
return -errno;
}
insns[0].imm = map;
memset(&prg_attr, 0, sizeof(prg_attr));
prg_attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
prg_attr.insns = insns;
prg_attr.insns_cnt = ARRAY_SIZE(insns);
prg_attr.license = "GPL";
ret = bpf_load_program_xattr(&prg_attr, NULL, 0);
if (ret >= 0) {
obj->caps.global_data = 1;
close(ret);
}
close(map);
return 0;
}
static int
bpf_object__probe_caps(struct bpf_object *obj)
{
return bpf_object__probe_name(obj);
int (*probe_fn[])(struct bpf_object *obj) = {
bpf_object__probe_name,
bpf_object__probe_global_data,
};
int i, ret;
for (i = 0; i < ARRAY_SIZE(probe_fn); i++) {
ret = probe_fn[i](obj);
if (ret < 0)
return ret;
}
return 0;
}
static int
@ -2063,6 +2136,7 @@ static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
case BPF_PROG_TYPE_UNSPEC:
case BPF_PROG_TYPE_TRACEPOINT:
case BPF_PROG_TYPE_RAW_TRACEPOINT:
case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
case BPF_PROG_TYPE_PERF_EVENT:
case BPF_PROG_TYPE_CGROUP_SYSCTL:
return false;
@ -2100,6 +2174,7 @@ __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz,
CHECK_ERR(bpf_object__elf_init(obj), err, out);
CHECK_ERR(bpf_object__check_endianness(obj), err, out);
CHECK_ERR(bpf_object__probe_caps(obj), err, out);
CHECK_ERR(bpf_object__elf_collect(obj, flags), err, out);
CHECK_ERR(bpf_object__collect_reloc(obj), err, out);
CHECK_ERR(bpf_object__validate(obj, needs_kver), err, out);
@ -2193,7 +2268,6 @@ int bpf_object__load(struct bpf_object *obj)
obj->loaded = true;
CHECK_ERR(bpf_object__probe_caps(obj), err, out);
CHECK_ERR(bpf_object__create_maps(obj), err, out);
CHECK_ERR(bpf_object__relocate(obj), err, out);
CHECK_ERR(bpf_object__load_progs(obj), err, out);

75
tools/lib/bpf/libbpf_probes.c
View file

@ -9,6 +9,7 @@
#include <net/if.h>
#include <sys/utsname.h>
#include <linux/btf.h>
#include <linux/filter.h>
#include <linux/kernel.h>
@ -93,6 +94,7 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
case BPF_PROG_TYPE_CGROUP_DEVICE:
case BPF_PROG_TYPE_SK_MSG:
case BPF_PROG_TYPE_RAW_TRACEPOINT:
case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
case BPF_PROG_TYPE_LWT_SEG6LOCAL:
case BPF_PROG_TYPE_LIRC_MODE2:
case BPF_PROG_TYPE_SK_REUSEPORT:
@ -130,11 +132,65 @@ bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex)
return errno != EINVAL && errno != EOPNOTSUPP;
}
static int load_btf(void)
{
#define BTF_INFO_ENC(kind, kind_flag, vlen) \
((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN))
#define BTF_TYPE_ENC(name, info, size_or_type) \
(name), (info), (size_or_type)
#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \
((encoding) << 24 | (bits_offset) << 16 | (nr_bits))
#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \
BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \
BTF_INT_ENC(encoding, bits_offset, bits)
#define BTF_MEMBER_ENC(name, type, bits_offset) \
(name), (type), (bits_offset)
const char btf_str_sec[] = "\0bpf_spin_lock\0val\0cnt\0l";
/* struct bpf_spin_lock {
* int val;
* };
* struct val {
* int cnt;
* struct bpf_spin_lock l;
* };
*/
__u32 btf_raw_types[] = {
/* int */
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
/* struct bpf_spin_lock */ /* [2] */
BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 1), 4),
BTF_MEMBER_ENC(15, 1, 0), /* int val; */
/* struct val */ /* [3] */
BTF_TYPE_ENC(15, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 2), 8),
BTF_MEMBER_ENC(19, 1, 0), /* int cnt; */
BTF_MEMBER_ENC(23, 2, 32),/* struct bpf_spin_lock l; */
};
struct btf_header btf_hdr = {
.magic = BTF_MAGIC,
.version = BTF_VERSION,
.hdr_len = sizeof(struct btf_header),
.type_len = sizeof(btf_raw_types),
.str_off = sizeof(btf_raw_types),
.str_len = sizeof(btf_str_sec),
};
__u8 raw_btf[sizeof(struct btf_header) + sizeof(btf_raw_types) +
sizeof(btf_str_sec)];
memcpy(raw_btf, &btf_hdr, sizeof(btf_hdr));
memcpy(raw_btf + sizeof(btf_hdr), btf_raw_types, sizeof(btf_raw_types));
memcpy(raw_btf + sizeof(btf_hdr) + sizeof(btf_raw_types),
btf_str_sec, sizeof(btf_str_sec));
return bpf_load_btf(raw_btf, sizeof(raw_btf), 0, 0, 0);
}
bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
{
int key_size, value_size, max_entries, map_flags;
__u32 btf_key_type_id = 0, btf_value_type_id = 0;
struct bpf_create_map_attr attr = {};
int fd = -1, fd_inner;
int fd = -1, btf_fd = -1, fd_inner;
key_size = sizeof(__u32);
value_size = sizeof(__u32);
@ -160,6 +216,16 @@ bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
case BPF_MAP_TYPE_STACK:
key_size = 0;
break;
case BPF_MAP_TYPE_SK_STORAGE:
btf_key_type_id = 1;
btf_value_type_id = 3;
value_size = 8;
max_entries = 0;
map_flags = BPF_F_NO_PREALLOC;
btf_fd = load_btf();
if (btf_fd < 0)
return false;
break;
case BPF_MAP_TYPE_UNSPEC:
case BPF_MAP_TYPE_HASH:
case BPF_MAP_TYPE_ARRAY:
@ -205,11 +271,18 @@ bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
attr.max_entries = max_entries;
attr.map_flags = map_flags;
attr.map_ifindex = ifindex;
if (btf_fd >= 0) {
attr.btf_fd = btf_fd;
attr.btf_key_type_id = btf_key_type_id;
attr.btf_value_type_id = btf_value_type_id;
}
fd = bpf_create_map_xattr(&attr);
}
if (fd >= 0)
close(fd);
if (btf_fd >= 0)
close(btf_fd);
return fd >= 0;
}