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selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads 

Add coverage to the verifier tests and tests for reading bpf_sock fields to
ensure that 32-bit, 16-bit, and 8-bit loads from dst_port field are allowed
only at intended offsets and produce expected values.

While 16-bit and 8-bit access to dst_port field is straight-forward, 32-bit
wide loads need be allowed and produce a zero-padded 16-bit value for
backward compatibility.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/r/20220130115518.213259-3-jakub@cloudflare.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jakub Sitnicki 2022-01-30 12:55:18 +01:00 committed by Alexei Starovoitov
parent 4421a58271
commit 8f50f16ff3
4 changed files with 162 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/include/uapi/linux/bpf.h
View File

@ -5574,7 +5574,8 @@ struct bpf_sock {
__u32 src_ip4;
__u32 src_ip6[4];
__u32 src_port; /* host byte order */
__u32 dst_port; /* network byte order */
__be16 dst_port; /* network byte order */
__u16 :16; /* zero padding */
__u32 dst_ip4;
__u32 dst_ip6[4];
__u32 state;

58
tools/testing/selftests/bpf/prog_tests/sock_fields.c
View File

@ -1,9 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#define _GNU_SOURCE
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sched.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
@ -20,6 +22,7 @@
enum bpf_linum_array_idx {
EGRESS_LINUM_IDX,
INGRESS_LINUM_IDX,
READ_SK_DST_PORT_LINUM_IDX,
__NR_BPF_LINUM_ARRAY_IDX,
};
@ -42,8 +45,16 @@ static __u64 child_cg_id;
static int linum_map_fd;
static __u32 duration;
static __u32 egress_linum_idx = EGRESS_LINUM_IDX;
static __u32 ingress_linum_idx = INGRESS_LINUM_IDX;
static bool create_netns(void)
{
if (!ASSERT_OK(unshare(CLONE_NEWNET), "create netns"))
return false;
if (!ASSERT_OK(system("ip link set dev lo up"), "bring up lo"))
return false;
return true;
}
static void print_sk(const struct bpf_sock *sk, const char *prefix)
{
@ -91,19 +102,24 @@ static void check_result(void)
{
struct bpf_tcp_sock srv_tp, cli_tp, listen_tp;
struct bpf_sock srv_sk, cli_sk, listen_sk;
__u32 ingress_linum, egress_linum;
__u32 idx, ingress_linum, egress_linum, linum;
int err;
err = bpf_map_lookup_elem(linum_map_fd, &egress_linum_idx,
&egress_linum);
idx = EGRESS_LINUM_IDX;
err = bpf_map_lookup_elem(linum_map_fd, &idx, &egress_linum);
CHECK(err < 0, "bpf_map_lookup_elem(linum_map_fd)",
"err:%d errno:%d\n", err, errno);
err = bpf_map_lookup_elem(linum_map_fd, &ingress_linum_idx,
&ingress_linum);
idx = INGRESS_LINUM_IDX;
err = bpf_map_lookup_elem(linum_map_fd, &idx, &ingress_linum);
CHECK(err < 0, "bpf_map_lookup_elem(linum_map_fd)",
"err:%d errno:%d\n", err, errno);
idx = READ_SK_DST_PORT_LINUM_IDX;
err = bpf_map_lookup_elem(linum_map_fd, &idx, &linum);
ASSERT_OK(err, "bpf_map_lookup_elem(linum_map_fd, READ_SK_DST_PORT_IDX)");
ASSERT_EQ(linum, 0, "failure in read_sk_dst_port on line");
memcpy(&srv_sk, &skel->bss->srv_sk, sizeof(srv_sk));
memcpy(&srv_tp, &skel->bss->srv_tp, sizeof(srv_tp));
memcpy(&cli_sk, &skel->bss->cli_sk, sizeof(cli_sk));
@ -262,7 +278,7 @@ static void test(void)
char buf[DATA_LEN];
/* Prepare listen_fd */
listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0xcafe, 0);
/* start_server() has logged the error details */
if (CHECK_FAIL(listen_fd == -1))
goto done;
@ -330,8 +346,12 @@ done:
void serial_test_sock_fields(void)
{
struct bpf_link *egress_link = NULL, *ingress_link = NULL;
int parent_cg_fd = -1, child_cg_fd = -1;
struct bpf_link *link;
/* Use a dedicated netns to have a fixed listen port */
if (!create_netns())
return;
/* Create a cgroup, get fd, and join it */
parent_cg_fd = test__join_cgroup(PARENT_CGROUP);
@ -352,15 +372,20 @@ void serial_test_sock_fields(void)
if (CHECK(!skel, "test_sock_fields__open_and_load", "failed\n"))
goto done;
egress_link = bpf_program__attach_cgroup(skel->progs.egress_read_sock_fields,
child_cg_fd);
if (!ASSERT_OK_PTR(egress_link, "attach_cgroup(egress)"))
link = bpf_program__attach_cgroup(skel->progs.egress_read_sock_fields, child_cg_fd);
if (!ASSERT_OK_PTR(link, "attach_cgroup(egress_read_sock_fields)"))
goto done;
skel->links.egress_read_sock_fields = link;
ingress_link = bpf_program__attach_cgroup(skel->progs.ingress_read_sock_fields,
child_cg_fd);
if (!ASSERT_OK_PTR(ingress_link, "attach_cgroup(ingress)"))
link = bpf_program__attach_cgroup(skel->progs.ingress_read_sock_fields, child_cg_fd);
if (!ASSERT_OK_PTR(link, "attach_cgroup(ingress_read_sock_fields)"))
goto done;
skel->links.ingress_read_sock_fields = link;
link = bpf_program__attach_cgroup(skel->progs.read_sk_dst_port, child_cg_fd);
if (!ASSERT_OK_PTR(link, "attach_cgroup(read_sk_dst_port"))
goto done;
skel->links.read_sk_dst_port = link;
linum_map_fd = bpf_map__fd(skel->maps.linum_map);
sk_pkt_out_cnt_fd = bpf_map__fd(skel->maps.sk_pkt_out_cnt);
@ -369,8 +394,7 @@ void serial_test_sock_fields(void)
test();
done:
bpf_link__destroy(egress_link);
bpf_link__destroy(ingress_link);
test_sock_fields__detach(skel);
test_sock_fields__destroy(skel);
if (child_cg_fd >= 0)
close(child_cg_fd);

41
tools/testing/selftests/bpf/progs/test_sock_fields.c
View File

@ -12,6 +12,7 @@
enum bpf_linum_array_idx {
EGRESS_LINUM_IDX,
INGRESS_LINUM_IDX,
READ_SK_DST_PORT_LINUM_IDX,
__NR_BPF_LINUM_ARRAY_IDX,
};
@ -250,4 +251,44 @@ int ingress_read_sock_fields(struct __sk_buff *skb)
return CG_OK;
}
static __noinline bool sk_dst_port__load_word(struct bpf_sock *sk)
{
__u32 *word = (__u32 *)&sk->dst_port;
return word[0] == bpf_htonl(0xcafe0000);
}
static __noinline bool sk_dst_port__load_half(struct bpf_sock *sk)
{
__u16 *half = (__u16 *)&sk->dst_port;
return half[0] == bpf_htons(0xcafe);
}
static __noinline bool sk_dst_port__load_byte(struct bpf_sock *sk)
{
__u8 *byte = (__u8 *)&sk->dst_port;
return byte[0] == 0xca && byte[1] == 0xfe;
}
SEC("cgroup_skb/egress")
int read_sk_dst_port(struct __sk_buff *skb)
{
__u32 linum, linum_idx;
struct bpf_sock *sk;
linum_idx = READ_SK_DST_PORT_LINUM_IDX;
sk = skb->sk;
if (!sk)
RET_LOG();
if (!sk_dst_port__load_word(sk))
RET_LOG();
if (!sk_dst_port__load_half(sk))
RET_LOG();
if (!sk_dst_port__load_byte(sk))
RET_LOG();
return CG_OK;
}
char _license[] SEC("license") = "GPL";

81
tools/testing/selftests/bpf/verifier/sock.c
View File

@ -121,7 +121,25 @@
.result = ACCEPT,
},
{
"sk_fullsock(skb->sk): sk->dst_port [narrow load]",
"sk_fullsock(skb->sk): sk->dst_port [word load] (backward compatibility)",
.insns = {
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_EMIT_CALL(BPF_FUNC_sk_fullsock),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, offsetof(struct bpf_sock, dst_port)),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.result = ACCEPT,
},
{
"sk_fullsock(skb->sk): sk->dst_port [half load]",
.insns = {
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
@ -139,7 +157,7 @@
.result = ACCEPT,
},
{
"sk_fullsock(skb->sk): sk->dst_port [load 2nd byte]",
"sk_fullsock(skb->sk): sk->dst_port [half load] (invalid)",
.insns = {
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
@ -149,7 +167,64 @@
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, offsetof(struct bpf_sock, dst_port) + 1),
BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_0, offsetof(struct bpf_sock, dst_port) + 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.result = REJECT,
.errstr = "invalid sock access",
},
{
"sk_fullsock(skb->sk): sk->dst_port [byte load]",
.insns = {
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_EMIT_CALL(BPF_FUNC_sk_fullsock),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_B, BPF_REG_2, BPF_REG_0, offsetof(struct bpf_sock, dst_port)),
BPF_LDX_MEM(BPF_B, BPF_REG_2, BPF_REG_0, offsetof(struct bpf_sock, dst_port) + 1),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.result = ACCEPT,
},
{
"sk_fullsock(skb->sk): sk->dst_port [byte load] (invalid)",
.insns = {
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_EMIT_CALL(BPF_FUNC_sk_fullsock),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, offsetof(struct bpf_sock, dst_port) + 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.result = REJECT,
.errstr = "invalid sock access",
},
{
"sk_fullsock(skb->sk): past sk->dst_port [half load] (invalid)",
.insns = {
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_EMIT_CALL(BPF_FUNC_sk_fullsock),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_0, offsetofend(struct bpf_sock, dst_port)),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},