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selftests/bpf: Test allowed maps for bpf_sk_select_reuseport 

Check that verifier allows passing a map of type:

 BPF_MAP_TYPE_REUSEPORT_SOCKARRARY, or
 BPF_MAP_TYPE_SOCKMAP, or
 BPF_MAP_TYPE_SOCKHASH

... to bpf_sk_select_reuseport helper.

Suggested-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200430104738.494180-1-jakub@cloudflare.com
This commit is contained in:
Jakub Sitnicki 2020-04-30 12:47:38 +02:00 committed by Daniel Borkmann
parent 063e688133
commit c321022244
2 changed files with 56 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
tools/testing/selftests/bpf/test_verifier.c
View File

@ -50,7 +50,7 @@
#define MAX_INSNS BPF_MAXINSNS
#define MAX_TEST_INSNS 1000000
#define MAX_FIXUPS 8
#define MAX_NR_MAPS 19
#define MAX_NR_MAPS 20
#define MAX_TEST_RUNS 8
#define POINTER_VALUE 0xcafe4all
#define TEST_DATA_LEN 64
@ -86,6 +86,7 @@ struct bpf_test {
int fixup_map_array_small[MAX_FIXUPS];
int fixup_sk_storage_map[MAX_FIXUPS];
int fixup_map_event_output[MAX_FIXUPS];
int fixup_map_reuseport_array[MAX_FIXUPS];
const char *errstr;
const char *errstr_unpriv;
uint32_t insn_processed;
@ -637,6 +638,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
int *fixup_map_array_small = test->fixup_map_array_small;
int *fixup_sk_storage_map = test->fixup_sk_storage_map;
int *fixup_map_event_output = test->fixup_map_event_output;
int *fixup_map_reuseport_array = test->fixup_map_reuseport_array;
if (test->fill_helper) {
test->fill_insns = calloc(MAX_TEST_INSNS, sizeof(struct bpf_insn));
@ -806,6 +808,14 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
fixup_map_event_output++;
} while (*fixup_map_event_output);
}
if (*fixup_map_reuseport_array) {
map_fds[19] = __create_map(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY,
sizeof(u32), sizeof(u64), 1, 0);
do {
prog[*fixup_map_reuseport_array].imm = map_fds[19];
fixup_map_reuseport_array++;
} while (*fixup_map_reuseport_array);
}
}
static int set_admin(bool admin)

45
tools/testing/selftests/bpf/verifier/sock.c
View File

@ -586,3 +586,48 @@
.prog_type = BPF_PROG_TYPE_SK_SKB,
.result = ACCEPT,
},
{
"bpf_sk_select_reuseport(ctx, reuseport_array, &key, flags)",
.insns = {
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -4),
BPF_LD_MAP_FD(BPF_REG_2, 0),
BPF_EMIT_CALL(BPF_FUNC_sk_select_reuseport),
BPF_EXIT_INSN(),
},
.fixup_map_reuseport_array = { 4 },
.prog_type = BPF_PROG_TYPE_SK_REUSEPORT,
.result = ACCEPT,
},
{
"bpf_sk_select_reuseport(ctx, sockmap, &key, flags)",
.insns = {
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -4),
BPF_LD_MAP_FD(BPF_REG_2, 0),
BPF_EMIT_CALL(BPF_FUNC_sk_select_reuseport),
BPF_EXIT_INSN(),
},
.fixup_map_sockmap = { 4 },
.prog_type = BPF_PROG_TYPE_SK_REUSEPORT,
.result = ACCEPT,
},
{
"bpf_sk_select_reuseport(ctx, sockhash, &key, flags)",
.insns = {
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -4),
BPF_LD_MAP_FD(BPF_REG_2, 0),
BPF_EMIT_CALL(BPF_FUNC_sk_select_reuseport),
BPF_EXIT_INSN(),
},
.fixup_map_sockmap = { 4 },
.prog_type = BPF_PROG_TYPE_SK_REUSEPORT,
.result = ACCEPT,
},