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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include <string.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h>
#include "bpf_kfuncs.h"
__u8 SERVUN_REWRITE_ADDRESS[] = "\0bpf_cgroup_unix_test_rewrite";
SEC("cgroup/sendmsg_unix")
int sendmsg_unix_prog(struct bpf_sock_addr *ctx)
{
struct bpf_sock_addr_kern *sa_kern = bpf_cast_to_kern_ctx(ctx);
struct sockaddr_un *sa_kern_unaddr;
__u32 unaddrlen = offsetof(struct sockaddr_un, sun_path) +
sizeof(SERVUN_REWRITE_ADDRESS) - 1;
int ret;
/* Rewrite destination. */
ret = bpf_sock_addr_set_sun_path(sa_kern, SERVUN_REWRITE_ADDRESS,
sizeof(SERVUN_REWRITE_ADDRESS) - 1);
if (ret)
return 0;
if (sa_kern->uaddrlen != unaddrlen)
return 0;
sa_kern_unaddr = bpf_core_cast(sa_kern->uaddr, struct sockaddr_un);
if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
return 0;
return 1;
}
SEC("cgroup/sendmsg_unix")
int sendmsg_unix_deny_prog(struct bpf_sock_addr *ctx)
{
return 0;
}
char _license[] SEC("license") = "GPL";
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