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selftests/bpf: Rewrite test_sock_addr bind bpf into C
I'm planning to extend it in the next patches. It's much easier to work with C than BPF assembly. Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20201202172516.3483656-2-sdf@google.com
This commit is contained in:
Stanislav Fomichev
Alexei Starovoitov
parent
ba0581749f
commit
a999696c54
71
tools/testing/selftests/bpf/progs/bind4_prog.c
Normal file
71
tools/testing/selftests/bpf/progs/bind4_prog.c
Normal file
@ -0,0 +1,71 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <string.h>
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#include <linux/stddef.h>
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#include <linux/bpf.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include <linux/if.h>
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#include <errno.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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#define SERV4_IP 0xc0a801feU /* 192.168.1.254 */
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#define SERV4_PORT 4040
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#define SERV4_REWRITE_IP 0x7f000001U /* 127.0.0.1 */
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#define SERV4_REWRITE_PORT 4444
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SEC("cgroup/bind4")
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int bind_v4_prog(struct bpf_sock_addr *ctx)
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{
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struct bpf_sock *sk;
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__u32 user_ip4;
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__u16 user_port;
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sk = ctx->sk;
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if (!sk)
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return 0;
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if (sk->family != AF_INET)
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return 0;
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if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
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return 0;
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if (ctx->user_ip4 != bpf_htonl(SERV4_IP) ||
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ctx->user_port != bpf_htons(SERV4_PORT))
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return 0;
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// u8 narrow loads:
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user_ip4 = 0;
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user_ip4 |= ((volatile __u8 *)&ctx->user_ip4)[0] << 0;
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user_ip4 |= ((volatile __u8 *)&ctx->user_ip4)[1] << 8;
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user_ip4 |= ((volatile __u8 *)&ctx->user_ip4)[2] << 16;
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user_ip4 |= ((volatile __u8 *)&ctx->user_ip4)[3] << 24;
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if (ctx->user_ip4 != user_ip4)
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return 0;
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user_port = 0;
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user_port |= ((volatile __u8 *)&ctx->user_port)[0] << 0;
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user_port |= ((volatile __u8 *)&ctx->user_port)[1] << 8;
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if (ctx->user_port != user_port)
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return 0;
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// u16 narrow loads:
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user_ip4 = 0;
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user_ip4 |= ((volatile __u16 *)&ctx->user_ip4)[0] << 0;
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user_ip4 |= ((volatile __u16 *)&ctx->user_ip4)[1] << 16;
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if (ctx->user_ip4 != user_ip4)
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return 0;
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ctx->user_ip4 = bpf_htonl(SERV4_REWRITE_IP);
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ctx->user_port = bpf_htons(SERV4_REWRITE_PORT);
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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88
tools/testing/selftests/bpf/progs/bind6_prog.c
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88
tools/testing/selftests/bpf/progs/bind6_prog.c
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@ -0,0 +1,88 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <string.h>
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#include <linux/stddef.h>
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#include <linux/bpf.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include <linux/if.h>
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#include <errno.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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#define SERV6_IP_0 0xfaceb00c /* face:b00c:1234:5678::abcd */
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#define SERV6_IP_1 0x12345678
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#define SERV6_IP_2 0x00000000
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#define SERV6_IP_3 0x0000abcd
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#define SERV6_PORT 6060
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#define SERV6_REWRITE_IP_0 0x00000000
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#define SERV6_REWRITE_IP_1 0x00000000
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#define SERV6_REWRITE_IP_2 0x00000000
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#define SERV6_REWRITE_IP_3 0x00000001
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#define SERV6_REWRITE_PORT 6666
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SEC("cgroup/bind6")
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int bind_v6_prog(struct bpf_sock_addr *ctx)
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{
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struct bpf_sock *sk;
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__u32 user_ip6;
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__u16 user_port;
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int i;
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sk = ctx->sk;
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if (!sk)
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return 0;
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if (sk->family != AF_INET6)
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return 0;
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if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
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return 0;
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if (ctx->user_ip6[0] != bpf_htonl(SERV6_IP_0) ||
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ctx->user_ip6[1] != bpf_htonl(SERV6_IP_1) ||
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ctx->user_ip6[2] != bpf_htonl(SERV6_IP_2) ||
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ctx->user_ip6[3] != bpf_htonl(SERV6_IP_3) ||
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ctx->user_port != bpf_htons(SERV6_PORT))
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return 0;
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// u8 narrow loads:
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for (i = 0; i < 4; i++) {
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user_ip6 = 0;
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user_ip6 |= ((volatile __u8 *)&ctx->user_ip6[i])[0] << 0;
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user_ip6 |= ((volatile __u8 *)&ctx->user_ip6[i])[1] << 8;
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user_ip6 |= ((volatile __u8 *)&ctx->user_ip6[i])[2] << 16;
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user_ip6 |= ((volatile __u8 *)&ctx->user_ip6[i])[3] << 24;
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if (ctx->user_ip6[i] != user_ip6)
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return 0;
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}
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user_port = 0;
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user_port |= ((volatile __u8 *)&ctx->user_port)[0] << 0;
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user_port |= ((volatile __u8 *)&ctx->user_port)[1] << 8;
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if (ctx->user_port != user_port)
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return 0;
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// u16 narrow loads:
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for (i = 0; i < 4; i++) {
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user_ip6 = 0;
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user_ip6 |= ((volatile __u16 *)&ctx->user_ip6[i])[0] << 0;
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user_ip6 |= ((volatile __u16 *)&ctx->user_ip6[i])[1] << 16;
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if (ctx->user_ip6[i] != user_ip6)
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return 0;
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}
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ctx->user_ip6[0] = bpf_htonl(SERV6_REWRITE_IP_0);
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ctx->user_ip6[1] = bpf_htonl(SERV6_REWRITE_IP_1);
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ctx->user_ip6[2] = bpf_htonl(SERV6_REWRITE_IP_2);
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ctx->user_ip6[3] = bpf_htonl(SERV6_REWRITE_IP_3);
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ctx->user_port = bpf_htons(SERV6_REWRITE_PORT);
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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@ -31,6 +31,8 @@
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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 BIND4_PROG_PATH "./bind4_prog.o"
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#define BIND6_PROG_PATH "./bind6_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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@ -660,190 +662,6 @@ static int load_insns(const struct sock_addr_test *test,
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return ret;
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}
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/* [1] These testing programs try to read different context fields, including
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* narrow loads of different sizes from user_ip4 and user_ip6, and write to
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* those allowed to be overridden.
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*
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* [2] BPF_LD_IMM64 & BPF_JMP_REG are used below whenever there is a need to
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* compare a register with unsigned 32bit integer. BPF_JMP_IMM can't be used
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* in such cases since it accepts only _signed_ 32bit integer as IMM
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* argument. Also note that BPF_LD_IMM64 contains 2 instructions what matters
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* to count jumps properly.
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*/
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static int bind4_prog_load(const struct sock_addr_test *test)
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{
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union {
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uint8_t u4_addr8[4];
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uint16_t u4_addr16[2];
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uint32_t u4_addr32;
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} ip4, port;
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struct sockaddr_in addr4_rw;
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if (inet_pton(AF_INET, SERV4_IP, (void *)&ip4) != 1) {
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log_err("Invalid IPv4: %s", SERV4_IP);
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return -1;
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}
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port.u4_addr32 = htons(SERV4_PORT);
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if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
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(struct sockaddr *)&addr4_rw, sizeof(addr4_rw)) == -1)
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return -1;
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/* See [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, 32),
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/* (sk.type == SOCK_DGRAM || sk.type == SOCK_STREAM) && */
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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, 1),
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BPF_JMP_A(1),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_STREAM, 28),
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/* 1st_byte_of_user_ip4 == expected && */
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BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip4)),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[0], 26),
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/* 2nd_byte_of_user_ip4 == expected && */
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BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip4) + 1),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[1], 24),
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/* 3rd_byte_of_user_ip4 == expected && */
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BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip4) + 2),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[2], 22),
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/* 4th_byte_of_user_ip4 == expected && */
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BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip4) + 3),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[3], 20),
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/* 1st_half_of_user_ip4 == expected && */
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BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip4)),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[0], 18),
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/* 2nd_half_of_user_ip4 == expected && */
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BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip4) + 2),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[1], 16),
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/* whole_user_ip4 == expected && */
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BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip4)),
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BPF_LD_IMM64(BPF_REG_8, ip4.u4_addr32), /* See [2]. */
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BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 12),
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/* 1st_byte_of_user_port == expected && */
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BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_port)),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, port.u4_addr8[0], 10),
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/* 1st_half_of_user_port == expected && */
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BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_port)),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, port.u4_addr16[0], 8),
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/* user_port == expected) { */
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BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_port)),
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BPF_LD_IMM64(BPF_REG_8, port.u4_addr32), /* See [2]. */
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BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 4),
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/* user_ip4 = addr4_rw.sin_addr */
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BPF_MOV32_IMM(BPF_REG_7, addr4_rw.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 = addr4_rw.sin_port */
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BPF_MOV32_IMM(BPF_REG_7, addr4_rw.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));
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}
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static int bind6_prog_load(const struct sock_addr_test *test)
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{
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struct sockaddr_in6 addr6_rw;
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struct in6_addr ip6;
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if (inet_pton(AF_INET6, SERV6_IP, (void *)&ip6) != 1) {
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log_err("Invalid IPv6: %s", SERV6_IP);
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return -1;
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}
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if (mk_sockaddr(AF_INET6, SERV6_REWRITE_IP, SERV6_REWRITE_PORT,
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(struct sockaddr *)&addr6_rw, sizeof(addr6_rw)) == -1)
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return -1;
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/* See [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_INET6 && */
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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_INET6, 18),
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/* 5th_byte_of_user_ip6 == expected && */
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BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip6[1])),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr[4], 16),
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/* 3rd_half_of_user_ip6 == expected && */
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BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip6[1])),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr16[2], 14),
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/* last_word_of_user_ip6 == expected) { */
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BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
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offsetof(struct bpf_sock_addr, user_ip6[3])),
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BPF_LD_IMM64(BPF_REG_8, ip6.s6_addr32[3]), /* See [2]. */
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BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 10),
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#define STORE_IPV6_WORD(N) \
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BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_addr.s6_addr32[N]), \
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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_ip6[N]))
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/* user_ip6 = addr6_rw.sin6_addr */
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STORE_IPV6_WORD(0),
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STORE_IPV6_WORD(1),
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STORE_IPV6_WORD(2),
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STORE_IPV6_WORD(3),
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/* user_port = addr6_rw.sin6_port */
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BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_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));
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}
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static int load_path(const struct sock_addr_test *test, const char *path)
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{
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struct bpf_prog_load_attr attr;
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@ -865,6 +683,16 @@ static int load_path(const struct sock_addr_test *test, const char *path)
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return prog_fd;
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}
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static int bind4_prog_load(const struct sock_addr_test *test)
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{
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return load_path(test, BIND4_PROG_PATH);
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}
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static int bind6_prog_load(const struct sock_addr_test *test)
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{
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return load_path(test, BIND6_PROG_PATH);
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}
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static int connect4_prog_load(const struct sock_addr_test *test)
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{
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return load_path(test, CONNECT4_PROG_PATH);
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