forked from Minki/linux
selftests/bpf: Selftest for sys_sendmsg hooks
Add selftest for BPF_CGROUP_UDP4_SENDMSG and BPF_CGROUP_UDP6_SENDMSG attach types. Try to sendmsg(2) to specific IP:port and test that: * source IP is overridden as expected. * remote IP:port pair is overridden as expected; Both UDPv4 and UDPv6 are tested. Output: # test_sock_addr.sh 2>/dev/null Wait for testing IPv4/IPv6 to become available ... OK ... pre-existing test-cases skipped ... Test case: sendmsg4: load prog with wrong expected attach type .. [PASS] Test case: sendmsg4: attach prog with wrong attach type .. [PASS] Test case: sendmsg4: rewrite IP & port (asm) .. [PASS] Test case: sendmsg4: rewrite IP & port (C) .. [PASS] Test case: sendmsg4: deny call .. [PASS] Test case: sendmsg6: load prog with wrong expected attach type .. [PASS] Test case: sendmsg6: attach prog with wrong attach type .. [PASS] Test case: sendmsg6: rewrite IP & port (asm) .. [PASS] Test case: sendmsg6: rewrite IP & port (C) .. [PASS] Test case: sendmsg6: IPv4-mapped IPv6 .. [PASS] Test case: sendmsg6: deny call .. [PASS] Summary: 27 PASSED, 0 FAILED Signed-off-by: Andrey Ignatov <rdna@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
parent
9be71aa6e5
commit
04b6ab7312
@ -34,7 +34,7 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
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sockmap_tcp_msg_prog.o connect4_prog.o connect6_prog.o test_adjust_tail.o \
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test_btf_haskv.o test_btf_nokv.o test_sockmap_kern.o test_tunnel_kern.o \
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test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o \
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test_lwt_seg6local.o
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test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o
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# Order correspond to 'make run_tests' order
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TEST_PROGS := test_kmod.sh \
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49
tools/testing/selftests/bpf/sendmsg4_prog.c
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49
tools/testing/selftests/bpf/sendmsg4_prog.c
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@ -0,0 +1,49 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#include <linux/stddef.h>
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#include <linux/bpf.h>
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#include <sys/socket.h>
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#include "bpf_helpers.h"
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#include "bpf_endian.h"
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#define SRC1_IP4 0xAC100001U /* 172.16.0.1 */
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#define SRC2_IP4 0x00000000U
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#define SRC_REWRITE_IP4 0x7f000004U
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#define DST_IP4 0xC0A801FEU /* 192.168.1.254 */
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#define DST_REWRITE_IP4 0x7f000001U
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#define DST_PORT 4040
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#define DST_REWRITE_PORT4 4444
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int _version SEC("version") = 1;
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SEC("cgroup/sendmsg4")
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int sendmsg_v4_prog(struct bpf_sock_addr *ctx)
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{
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if (ctx->type != SOCK_DGRAM)
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return 0;
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/* Rewrite source. */
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if (ctx->msg_src_ip4 == bpf_htonl(SRC1_IP4) ||
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ctx->msg_src_ip4 == bpf_htonl(SRC2_IP4)) {
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ctx->msg_src_ip4 = bpf_htonl(SRC_REWRITE_IP4);
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} else {
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/* Unexpected source. Reject sendmsg. */
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return 0;
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}
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/* Rewrite destination. */
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if ((ctx->user_ip4 >> 24) == (bpf_htonl(DST_IP4) >> 24) &&
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ctx->user_port == bpf_htons(DST_PORT)) {
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ctx->user_ip4 = bpf_htonl(DST_REWRITE_IP4);
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ctx->user_port = bpf_htons(DST_REWRITE_PORT4);
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} else {
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/* Unexpected source. Reject sendmsg. */
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return 0;
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}
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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60
tools/testing/selftests/bpf/sendmsg6_prog.c
Normal file
60
tools/testing/selftests/bpf/sendmsg6_prog.c
Normal file
@ -0,0 +1,60 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#include <linux/stddef.h>
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#include <linux/bpf.h>
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#include <sys/socket.h>
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#include "bpf_helpers.h"
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#include "bpf_endian.h"
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#define SRC_REWRITE_IP6_0 0
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#define SRC_REWRITE_IP6_1 0
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#define SRC_REWRITE_IP6_2 0
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#define SRC_REWRITE_IP6_3 6
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#define DST_REWRITE_IP6_0 0
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#define DST_REWRITE_IP6_1 0
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#define DST_REWRITE_IP6_2 0
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#define DST_REWRITE_IP6_3 1
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#define DST_REWRITE_PORT6 6666
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int _version SEC("version") = 1;
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SEC("cgroup/sendmsg6")
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int sendmsg_v6_prog(struct bpf_sock_addr *ctx)
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{
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if (ctx->type != SOCK_DGRAM)
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return 0;
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/* Rewrite source. */
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if (ctx->msg_src_ip6[3] == bpf_htonl(1) ||
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ctx->msg_src_ip6[3] == bpf_htonl(0)) {
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ctx->msg_src_ip6[0] = bpf_htonl(SRC_REWRITE_IP6_0);
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ctx->msg_src_ip6[1] = bpf_htonl(SRC_REWRITE_IP6_1);
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ctx->msg_src_ip6[2] = bpf_htonl(SRC_REWRITE_IP6_2);
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ctx->msg_src_ip6[3] = bpf_htonl(SRC_REWRITE_IP6_3);
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} else {
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/* Unexpected source. Reject sendmsg. */
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return 0;
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}
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/* Rewrite destination. */
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if ((ctx->user_ip6[0] & 0xFFFF) == bpf_htons(0xFACE) &&
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ctx->user_ip6[0] >> 16 == bpf_htons(0xB00C)) {
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ctx->user_ip6[0] = bpf_htonl(DST_REWRITE_IP6_0);
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ctx->user_ip6[1] = bpf_htonl(DST_REWRITE_IP6_1);
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ctx->user_ip6[2] = bpf_htonl(DST_REWRITE_IP6_2);
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ctx->user_ip6[3] = bpf_htonl(DST_REWRITE_IP6_3);
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ctx->user_port = bpf_htons(DST_REWRITE_PORT6);
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} else {
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/* Unexpected destination. Reject sendmsg. */
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return 0;
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}
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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@ -1,12 +1,16 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <linux/filter.h>
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@ -17,6 +21,10 @@
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#include "cgroup_helpers.h"
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#include "bpf_rlimit.h"
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#ifndef ENOTSUPP
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# define ENOTSUPP 524
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#endif
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#ifndef ARRAY_SIZE
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# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#endif
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@ -24,15 +32,20 @@
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#define CG_PATH "/foo"
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#define CONNECT4_PROG_PATH "./connect4_prog.o"
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#define CONNECT6_PROG_PATH "./connect6_prog.o"
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#define SENDMSG4_PROG_PATH "./sendmsg4_prog.o"
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#define SENDMSG6_PROG_PATH "./sendmsg6_prog.o"
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#define SERV4_IP "192.168.1.254"
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#define SERV4_REWRITE_IP "127.0.0.1"
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#define SRC4_IP "172.16.0.1"
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#define SRC4_REWRITE_IP "127.0.0.4"
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#define SERV4_PORT 4040
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#define SERV4_REWRITE_PORT 4444
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#define SERV6_IP "face:b00c:1234:5678::abcd"
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#define SERV6_REWRITE_IP "::1"
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#define SERV6_V4MAPPED_IP "::ffff:192.168.0.4"
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#define SRC6_IP "::1"
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#define SRC6_REWRITE_IP "::6"
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#define SERV6_PORT 6060
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#define SERV6_REWRITE_PORT 6666
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@ -65,6 +78,8 @@ struct sock_addr_test {
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enum {
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LOAD_REJECT,
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ATTACH_REJECT,
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SYSCALL_EPERM,
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SYSCALL_ENOTSUPP,
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SUCCESS,
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} expected_result;
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};
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@ -73,6 +88,12 @@ static int bind4_prog_load(const struct sock_addr_test *test);
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static int bind6_prog_load(const struct sock_addr_test *test);
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static int connect4_prog_load(const struct sock_addr_test *test);
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static int connect6_prog_load(const struct sock_addr_test *test);
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static int sendmsg_deny_prog_load(const struct sock_addr_test *test);
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static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
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static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test);
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static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
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static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test);
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static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test);
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static struct sock_addr_test tests[] = {
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/* bind */
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@ -302,6 +323,162 @@ static struct sock_addr_test tests[] = {
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SRC6_REWRITE_IP,
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SUCCESS,
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},
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/* sendmsg */
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{
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"sendmsg4: load prog with wrong expected attach type",
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sendmsg4_rw_asm_prog_load,
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BPF_CGROUP_UDP6_SENDMSG,
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BPF_CGROUP_UDP4_SENDMSG,
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AF_INET,
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SOCK_DGRAM,
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NULL,
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0,
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NULL,
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0,
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NULL,
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LOAD_REJECT,
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},
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{
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"sendmsg4: attach prog with wrong attach type",
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sendmsg4_rw_asm_prog_load,
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BPF_CGROUP_UDP4_SENDMSG,
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BPF_CGROUP_UDP6_SENDMSG,
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AF_INET,
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SOCK_DGRAM,
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NULL,
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0,
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NULL,
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0,
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NULL,
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ATTACH_REJECT,
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},
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{
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"sendmsg4: rewrite IP & port (asm)",
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sendmsg4_rw_asm_prog_load,
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BPF_CGROUP_UDP4_SENDMSG,
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BPF_CGROUP_UDP4_SENDMSG,
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AF_INET,
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SOCK_DGRAM,
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SERV4_IP,
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SERV4_PORT,
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SERV4_REWRITE_IP,
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SERV4_REWRITE_PORT,
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SRC4_REWRITE_IP,
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SUCCESS,
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},
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{
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"sendmsg4: rewrite IP & port (C)",
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sendmsg4_rw_c_prog_load,
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BPF_CGROUP_UDP4_SENDMSG,
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BPF_CGROUP_UDP4_SENDMSG,
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AF_INET,
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SOCK_DGRAM,
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SERV4_IP,
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SERV4_PORT,
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SERV4_REWRITE_IP,
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SERV4_REWRITE_PORT,
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SRC4_REWRITE_IP,
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SUCCESS,
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},
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{
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"sendmsg4: deny call",
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sendmsg_deny_prog_load,
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BPF_CGROUP_UDP4_SENDMSG,
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BPF_CGROUP_UDP4_SENDMSG,
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AF_INET,
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SOCK_DGRAM,
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SERV4_IP,
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SERV4_PORT,
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SERV4_REWRITE_IP,
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SERV4_REWRITE_PORT,
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SRC4_REWRITE_IP,
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SYSCALL_EPERM,
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},
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{
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"sendmsg6: load prog with wrong expected attach type",
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sendmsg6_rw_asm_prog_load,
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BPF_CGROUP_UDP4_SENDMSG,
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BPF_CGROUP_UDP6_SENDMSG,
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AF_INET6,
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SOCK_DGRAM,
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NULL,
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0,
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NULL,
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0,
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NULL,
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LOAD_REJECT,
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},
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{
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"sendmsg6: attach prog with wrong attach type",
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sendmsg6_rw_asm_prog_load,
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BPF_CGROUP_UDP6_SENDMSG,
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BPF_CGROUP_UDP4_SENDMSG,
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AF_INET6,
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SOCK_DGRAM,
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NULL,
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0,
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NULL,
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0,
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NULL,
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ATTACH_REJECT,
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},
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{
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"sendmsg6: rewrite IP & port (asm)",
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sendmsg6_rw_asm_prog_load,
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BPF_CGROUP_UDP6_SENDMSG,
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BPF_CGROUP_UDP6_SENDMSG,
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AF_INET6,
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SOCK_DGRAM,
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SERV6_IP,
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SERV6_PORT,
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SERV6_REWRITE_IP,
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SERV6_REWRITE_PORT,
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SRC6_REWRITE_IP,
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SUCCESS,
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},
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{
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"sendmsg6: rewrite IP & port (C)",
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sendmsg6_rw_c_prog_load,
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BPF_CGROUP_UDP6_SENDMSG,
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BPF_CGROUP_UDP6_SENDMSG,
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AF_INET6,
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SOCK_DGRAM,
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SERV6_IP,
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SERV6_PORT,
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SERV6_REWRITE_IP,
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SERV6_REWRITE_PORT,
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SRC6_REWRITE_IP,
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SUCCESS,
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},
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{
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"sendmsg6: IPv4-mapped IPv6",
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sendmsg6_rw_v4mapped_prog_load,
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BPF_CGROUP_UDP6_SENDMSG,
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BPF_CGROUP_UDP6_SENDMSG,
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AF_INET6,
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SOCK_DGRAM,
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SERV6_IP,
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SERV6_PORT,
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SERV6_REWRITE_IP,
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SERV6_REWRITE_PORT,
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SRC6_REWRITE_IP,
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SYSCALL_ENOTSUPP,
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},
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{
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"sendmsg6: deny call",
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sendmsg_deny_prog_load,
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BPF_CGROUP_UDP6_SENDMSG,
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BPF_CGROUP_UDP6_SENDMSG,
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AF_INET6,
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SOCK_DGRAM,
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SERV6_IP,
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SERV6_PORT,
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SERV6_REWRITE_IP,
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SERV6_REWRITE_PORT,
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SRC6_REWRITE_IP,
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SYSCALL_EPERM,
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},
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};
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static int mk_sockaddr(int domain, const char *ip, unsigned short port,
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@ -540,6 +717,141 @@ static int connect6_prog_load(const struct sock_addr_test *test)
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return load_path(test, CONNECT6_PROG_PATH);
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}
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static int sendmsg_deny_prog_load(const struct sock_addr_test *test)
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{
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struct bpf_insn insns[] = {
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/* return 0 */
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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};
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return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
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}
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static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
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{
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struct sockaddr_in dst4_rw_addr;
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struct in_addr src4_rw_ip;
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if (inet_pton(AF_INET, SRC4_REWRITE_IP, (void *)&src4_rw_ip) != 1) {
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log_err("Invalid IPv4: %s", SRC4_REWRITE_IP);
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return -1;
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}
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if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
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(struct sockaddr *)&dst4_rw_addr,
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sizeof(dst4_rw_addr)) == -1)
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return -1;
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struct bpf_insn insns[] = {
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
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/* if (sk.family == AF_INET && */
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BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, family)),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 8),
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/* sk.type == SOCK_DGRAM) { */
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BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, type)),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 6),
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/* msg_src_ip4 = src4_rw_ip */
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BPF_MOV32_IMM(BPF_REG_7, src4_rw_ip.s_addr),
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BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
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offsetof(struct bpf_sock_addr, msg_src_ip4)),
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/* user_ip4 = dst4_rw_addr.sin_addr */
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BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_addr.s_addr),
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BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
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offsetof(struct bpf_sock_addr, user_ip4)),
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/* user_port = dst4_rw_addr.sin_port */
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BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_port),
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BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
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offsetof(struct bpf_sock_addr, user_port)),
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/* } */
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/* return 1 */
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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};
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return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
|
||||
}
|
||||
|
||||
static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test)
|
||||
{
|
||||
return load_path(test, SENDMSG4_PROG_PATH);
|
||||
}
|
||||
|
||||
static int sendmsg6_rw_dst_asm_prog_load(const struct sock_addr_test *test,
|
||||
const char *rw_dst_ip)
|
||||
{
|
||||
struct sockaddr_in6 dst6_rw_addr;
|
||||
struct in6_addr src6_rw_ip;
|
||||
|
||||
if (inet_pton(AF_INET6, SRC6_REWRITE_IP, (void *)&src6_rw_ip) != 1) {
|
||||
log_err("Invalid IPv6: %s", SRC6_REWRITE_IP);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (mk_sockaddr(AF_INET6, rw_dst_ip, SERV6_REWRITE_PORT,
|
||||
(struct sockaddr *)&dst6_rw_addr,
|
||||
sizeof(dst6_rw_addr)) == -1)
|
||||
return -1;
|
||||
|
||||
struct bpf_insn insns[] = {
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
||||
|
||||
/* if (sk.family == AF_INET6) { */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
|
||||
offsetof(struct bpf_sock_addr, family)),
|
||||
BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
|
||||
|
||||
#define STORE_IPV6_WORD_N(DST, SRC, N) \
|
||||
BPF_MOV32_IMM(BPF_REG_7, SRC[N]), \
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, \
|
||||
offsetof(struct bpf_sock_addr, DST[N]))
|
||||
|
||||
#define STORE_IPV6(DST, SRC) \
|
||||
STORE_IPV6_WORD_N(DST, SRC, 0), \
|
||||
STORE_IPV6_WORD_N(DST, SRC, 1), \
|
||||
STORE_IPV6_WORD_N(DST, SRC, 2), \
|
||||
STORE_IPV6_WORD_N(DST, SRC, 3)
|
||||
|
||||
STORE_IPV6(msg_src_ip6, src6_rw_ip.s6_addr32),
|
||||
STORE_IPV6(user_ip6, dst6_rw_addr.sin6_addr.s6_addr32),
|
||||
|
||||
/* user_port = dst6_rw_addr.sin6_port */
|
||||
BPF_MOV32_IMM(BPF_REG_7, dst6_rw_addr.sin6_port),
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
|
||||
offsetof(struct bpf_sock_addr, user_port)),
|
||||
|
||||
/* } */
|
||||
|
||||
/* return 1 */
|
||||
BPF_MOV64_IMM(BPF_REG_0, 1),
|
||||
BPF_EXIT_INSN(),
|
||||
};
|
||||
|
||||
return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
|
||||
}
|
||||
|
||||
static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
|
||||
{
|
||||
return sendmsg6_rw_dst_asm_prog_load(test, SERV6_REWRITE_IP);
|
||||
}
|
||||
|
||||
static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test)
|
||||
{
|
||||
return sendmsg6_rw_dst_asm_prog_load(test, SERV6_V4MAPPED_IP);
|
||||
}
|
||||
|
||||
static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test)
|
||||
{
|
||||
return load_path(test, SENDMSG6_PROG_PATH);
|
||||
}
|
||||
|
||||
static int cmp_addr(const struct sockaddr_storage *addr1,
|
||||
const struct sockaddr_storage *addr2, int cmp_port)
|
||||
{
|
||||
@ -656,6 +968,135 @@ out:
|
||||
return fd;
|
||||
}
|
||||
|
||||
int init_pktinfo(int domain, struct cmsghdr *cmsg)
|
||||
{
|
||||
struct in6_pktinfo *pktinfo6;
|
||||
struct in_pktinfo *pktinfo4;
|
||||
|
||||
if (domain == AF_INET) {
|
||||
cmsg->cmsg_level = SOL_IP;
|
||||
cmsg->cmsg_type = IP_PKTINFO;
|
||||
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
|
||||
pktinfo4 = (struct in_pktinfo *)CMSG_DATA(cmsg);
|
||||
memset(pktinfo4, 0, sizeof(struct in_pktinfo));
|
||||
if (inet_pton(domain, SRC4_IP,
|
||||
(void *)&pktinfo4->ipi_spec_dst) != 1)
|
||||
return -1;
|
||||
} else if (domain == AF_INET6) {
|
||||
cmsg->cmsg_level = SOL_IPV6;
|
||||
cmsg->cmsg_type = IPV6_PKTINFO;
|
||||
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
|
||||
pktinfo6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
|
||||
memset(pktinfo6, 0, sizeof(struct in6_pktinfo));
|
||||
if (inet_pton(domain, SRC6_IP,
|
||||
(void *)&pktinfo6->ipi6_addr) != 1)
|
||||
return -1;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sendmsg_to_server(const struct sockaddr_storage *addr,
|
||||
socklen_t addr_len, int set_cmsg, int *syscall_err)
|
||||
{
|
||||
union {
|
||||
char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
|
||||
struct cmsghdr align;
|
||||
} control6;
|
||||
union {
|
||||
char buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
|
||||
struct cmsghdr align;
|
||||
} control4;
|
||||
struct msghdr hdr;
|
||||
struct iovec iov;
|
||||
char data = 'a';
|
||||
int domain;
|
||||
int fd = -1;
|
||||
|
||||
domain = addr->ss_family;
|
||||
|
||||
if (domain != AF_INET && domain != AF_INET6) {
|
||||
log_err("Unsupported address family");
|
||||
goto err;
|
||||
}
|
||||
|
||||
fd = socket(domain, SOCK_DGRAM, 0);
|
||||
if (fd == -1) {
|
||||
log_err("Failed to create client socket");
|
||||
goto err;
|
||||
}
|
||||
|
||||
memset(&iov, 0, sizeof(iov));
|
||||
iov.iov_base = &data;
|
||||
iov.iov_len = sizeof(data);
|
||||
|
||||
memset(&hdr, 0, sizeof(hdr));
|
||||
hdr.msg_name = (void *)addr;
|
||||
hdr.msg_namelen = addr_len;
|
||||
hdr.msg_iov = &iov;
|
||||
hdr.msg_iovlen = 1;
|
||||
|
||||
if (set_cmsg) {
|
||||
if (domain == AF_INET) {
|
||||
hdr.msg_control = &control4;
|
||||
hdr.msg_controllen = sizeof(control4.buf);
|
||||
} else if (domain == AF_INET6) {
|
||||
hdr.msg_control = &control6;
|
||||
hdr.msg_controllen = sizeof(control6.buf);
|
||||
}
|
||||
if (init_pktinfo(domain, CMSG_FIRSTHDR(&hdr))) {
|
||||
log_err("Fail to init pktinfo");
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
if (sendmsg(fd, &hdr, 0) != sizeof(data)) {
|
||||
log_err("Fail to send message to server");
|
||||
*syscall_err = errno;
|
||||
goto err;
|
||||
}
|
||||
|
||||
goto out;
|
||||
err:
|
||||
close(fd);
|
||||
fd = -1;
|
||||
out:
|
||||
return fd;
|
||||
}
|
||||
|
||||
static int recvmsg_from_client(int sockfd, struct sockaddr_storage *src_addr)
|
||||
{
|
||||
struct timeval tv;
|
||||
struct msghdr hdr;
|
||||
struct iovec iov;
|
||||
char data[64];
|
||||
fd_set rfds;
|
||||
|
||||
FD_ZERO(&rfds);
|
||||
FD_SET(sockfd, &rfds);
|
||||
|
||||
tv.tv_sec = 2;
|
||||
tv.tv_usec = 0;
|
||||
|
||||
if (select(sockfd + 1, &rfds, NULL, NULL, &tv) <= 0 ||
|
||||
!FD_ISSET(sockfd, &rfds))
|
||||
return -1;
|
||||
|
||||
memset(&iov, 0, sizeof(iov));
|
||||
iov.iov_base = data;
|
||||
iov.iov_len = sizeof(data);
|
||||
|
||||
memset(&hdr, 0, sizeof(hdr));
|
||||
hdr.msg_name = src_addr;
|
||||
hdr.msg_namelen = sizeof(struct sockaddr_storage);
|
||||
hdr.msg_iov = &iov;
|
||||
hdr.msg_iovlen = 1;
|
||||
|
||||
return recvmsg(sockfd, &hdr, 0);
|
||||
}
|
||||
|
||||
static int init_addrs(const struct sock_addr_test *test,
|
||||
struct sockaddr_storage *requested_addr,
|
||||
struct sockaddr_storage *expected_addr,
|
||||
@ -753,6 +1194,69 @@ out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int run_sendmsg_test_case(const struct sock_addr_test *test)
|
||||
{
|
||||
socklen_t addr_len = sizeof(struct sockaddr_storage);
|
||||
struct sockaddr_storage expected_src_addr;
|
||||
struct sockaddr_storage requested_addr;
|
||||
struct sockaddr_storage expected_addr;
|
||||
struct sockaddr_storage real_src_addr;
|
||||
int clientfd = -1;
|
||||
int servfd = -1;
|
||||
int set_cmsg;
|
||||
int err = 0;
|
||||
|
||||
if (test->type != SOCK_DGRAM)
|
||||
goto err;
|
||||
|
||||
if (init_addrs(test, &requested_addr, &expected_addr,
|
||||
&expected_src_addr))
|
||||
goto err;
|
||||
|
||||
/* Prepare server to sendmsg to */
|
||||
servfd = start_server(test->type, &expected_addr, addr_len);
|
||||
if (servfd == -1)
|
||||
goto err;
|
||||
|
||||
for (set_cmsg = 0; set_cmsg <= 1; ++set_cmsg) {
|
||||
if (clientfd >= 0)
|
||||
close(clientfd);
|
||||
|
||||
clientfd = sendmsg_to_server(&requested_addr, addr_len,
|
||||
set_cmsg, &err);
|
||||
if (err)
|
||||
goto out;
|
||||
else if (clientfd == -1)
|
||||
goto err;
|
||||
|
||||
/* Try to receive message on server instead of using
|
||||
* getpeername(2) on client socket, to check that client's
|
||||
* destination address was rewritten properly, since
|
||||
* getpeername(2) doesn't work with unconnected datagram
|
||||
* sockets.
|
||||
*
|
||||
* Get source address from recvmsg(2) as well to make sure
|
||||
* source was rewritten properly: getsockname(2) can't be used
|
||||
* since socket is unconnected and source defined for one
|
||||
* specific packet may differ from the one used by default and
|
||||
* returned by getsockname(2).
|
||||
*/
|
||||
if (recvmsg_from_client(servfd, &real_src_addr) == -1)
|
||||
goto err;
|
||||
|
||||
if (cmp_addr(&real_src_addr, &expected_src_addr, /*cmp_port*/0))
|
||||
goto err;
|
||||
}
|
||||
|
||||
goto out;
|
||||
err:
|
||||
err = -1;
|
||||
out:
|
||||
close(clientfd);
|
||||
close(servfd);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int run_test_case(int cgfd, const struct sock_addr_test *test)
|
||||
{
|
||||
int progfd = -1;
|
||||
@ -784,10 +1288,24 @@ static int run_test_case(int cgfd, const struct sock_addr_test *test)
|
||||
case BPF_CGROUP_INET6_CONNECT:
|
||||
err = run_connect_test_case(test);
|
||||
break;
|
||||
case BPF_CGROUP_UDP4_SENDMSG:
|
||||
case BPF_CGROUP_UDP6_SENDMSG:
|
||||
err = run_sendmsg_test_case(test);
|
||||
break;
|
||||
default:
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (test->expected_result == SYSCALL_EPERM && err == EPERM) {
|
||||
err = 0; /* error was expected, reset it */
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (test->expected_result == SYSCALL_ENOTSUPP && err == ENOTSUPP) {
|
||||
err = 0; /* error was expected, reset it */
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (err || test->expected_result != SUCCESS)
|
||||
goto err;
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user