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selftests/bpf: Rewrite recvmsg{4,6} asm progs to c in test_sock_addr 

I'll extend them in the next patch. It's easier to work with C
than with asm.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210127232853.3753823-4-sdf@google.com
This commit is contained in:
Stanislav Fomichev 2021-01-27 15:28:52 -08:00 committed by Daniel Borkmann
parent 073f4ec124
commit 3574906016
3 changed files with 92 additions and 74 deletions
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37
tools/testing/selftests/bpf/progs/recvmsg4_prog.c Normal file
View File

@ -0,0 +1,37 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/stddef.h>
#include <linux/bpf.h>
#include <linux/in.h>
#include <sys/socket.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#define SERV4_IP 0xc0a801feU /* 192.168.1.254 */
#define SERV4_PORT 4040
SEC("cgroup/recvmsg4")
int recvmsg4_prog(struct bpf_sock_addr *ctx)
{
struct bpf_sock *sk;
__u32 user_ip4;
__u16 user_port;
sk = ctx->sk;
if (!sk)
return 1;
if (sk->family != AF_INET)
return 1;
if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
return 1;
ctx->user_ip4 = bpf_htonl(SERV4_IP);
ctx->user_port = bpf_htons(SERV4_PORT);
return 1;
}
char _license[] SEC("license") = "GPL";

43
tools/testing/selftests/bpf/progs/recvmsg6_prog.c Normal file
View File

@ -0,0 +1,43 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/stddef.h>
#include <linux/bpf.h>
#include <linux/in6.h>
#include <sys/socket.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#define SERV6_IP_0 0xfaceb00c /* face:b00c:1234:5678::abcd */
#define SERV6_IP_1 0x12345678
#define SERV6_IP_2 0x00000000
#define SERV6_IP_3 0x0000abcd
#define SERV6_PORT 6060
SEC("cgroup/recvmsg6")
int recvmsg6_prog(struct bpf_sock_addr *ctx)
{
struct bpf_sock *sk;
__u32 user_ip4;
__u16 user_port;
sk = ctx->sk;
if (!sk)
return 1;
if (sk->family != AF_INET6)
return 1;
if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
return 1;
ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0);
ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1);
ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2);
ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3);
ctx->user_port = bpf_htons(SERV6_PORT);
return 1;
}
char _license[] SEC("license") = "GPL";

86
tools/testing/selftests/bpf/test_sock_addr.c
View File

@ -31,6 +31,8 @@
#define CONNECT6_PROG_PATH "./connect6_prog.o"
#define SENDMSG4_PROG_PATH "./sendmsg4_prog.o"
#define SENDMSG6_PROG_PATH "./sendmsg6_prog.o"
#define RECVMSG4_PROG_PATH "./recvmsg4_prog.o"
#define RECVMSG6_PROG_PATH "./recvmsg6_prog.o"
#define BIND4_PROG_PATH "./bind4_prog.o"
#define BIND6_PROG_PATH "./bind6_prog.o"
@ -94,10 +96,10 @@ static int sendmsg_deny_prog_load(const struct sock_addr_test *test);
static int recvmsg_allow_prog_load(const struct sock_addr_test *test);
static int recvmsg_deny_prog_load(const struct sock_addr_test *test);
static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
static int recvmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
static int recvmsg4_rw_c_prog_load(const struct sock_addr_test *test);
static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test);
static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
static int recvmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
static int recvmsg6_rw_c_prog_load(const struct sock_addr_test *test);
static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test);
static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test);
static int sendmsg6_rw_wildcard_prog_load(const struct sock_addr_test *test);
@ -573,8 +575,8 @@ static struct sock_addr_test tests[] = {
LOAD_REJECT,
},
{
"recvmsg4: rewrite IP & port (asm)",
recvmsg4_rw_asm_prog_load,
"recvmsg4: rewrite IP & port (C)",
recvmsg4_rw_c_prog_load,
BPF_CGROUP_UDP4_RECVMSG,
BPF_CGROUP_UDP4_RECVMSG,
AF_INET,
@ -587,8 +589,8 @@ static struct sock_addr_test tests[] = {
SUCCESS,
},
{
"recvmsg6: rewrite IP & port (asm)",
recvmsg6_rw_asm_prog_load,
"recvmsg6: rewrite IP & port (C)",
recvmsg6_rw_c_prog_load,
BPF_CGROUP_UDP6_RECVMSG,
BPF_CGROUP_UDP6_RECVMSG,
AF_INET6,
@ -786,45 +788,9 @@ static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
}
static int recvmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
static int recvmsg4_rw_c_prog_load(const struct sock_addr_test *test)
{
struct sockaddr_in src4_rw_addr;
if (mk_sockaddr(AF_INET, SERV4_IP, SERV4_PORT,
(struct sockaddr *)&src4_rw_addr,
sizeof(src4_rw_addr)) == -1)
return -1;
struct bpf_insn insns[] = {
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
/* if (sk.family == AF_INET && */
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_INET, 6),
/* sk.type == SOCK_DGRAM) { */
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
offsetof(struct bpf_sock_addr, type)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 4),
/* user_ip4 = src4_rw_addr.sin_addr */
BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_addr.s_addr),
BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
offsetof(struct bpf_sock_addr, user_ip4)),
/* user_port = src4_rw_addr.sin_port */
BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_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));
return load_path(test, RECVMSG4_PROG_PATH);
}
static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test)
@ -890,37 +856,9 @@ 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 recvmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
static int recvmsg6_rw_c_prog_load(const struct sock_addr_test *test)
{
struct sockaddr_in6 src6_rw_addr;
if (mk_sockaddr(AF_INET6, SERV6_IP, SERV6_PORT,
(struct sockaddr *)&src6_rw_addr,
sizeof(src6_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, 10),
STORE_IPV6(user_ip6, src6_rw_addr.sin6_addr.s6_addr32),
/* user_port = dst6_rw_addr.sin6_port */
BPF_MOV32_IMM(BPF_REG_7, src6_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));
return load_path(test, RECVMSG6_PROG_PATH);
}
static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test)