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

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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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43
tools/testing/selftests/bpf/progs/recvmsg6_prog.c Normal file
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// 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";