mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 07:25:25 +07:00
9108e3a023
Use bpf_sk_lookup_tcp, bpf_sk_lookup_udp and bpf_sk_release helpers from test_sock_addr programs to make sure they're available and can lookup and release socket properly for IPv4/IPv4, TCP/UDP. Reading from a few fields of returned struct bpf_sock is also tested. 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: Alexei Starovoitov <ast@kernel.org>
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2018 Facebook
|
|
|
|
#include <string.h>
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/bpf.h>
|
|
#include <linux/in.h>
|
|
#include <linux/in6.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include "bpf_helpers.h"
|
|
#include "bpf_endian.h"
|
|
|
|
#define SRC_REWRITE_IP4 0x7f000004U
|
|
#define DST_REWRITE_IP4 0x7f000001U
|
|
#define DST_REWRITE_PORT4 4444
|
|
|
|
int _version SEC("version") = 1;
|
|
|
|
SEC("cgroup/connect4")
|
|
int connect_v4_prog(struct bpf_sock_addr *ctx)
|
|
{
|
|
struct bpf_sock_tuple tuple = {};
|
|
struct sockaddr_in sa;
|
|
struct bpf_sock *sk;
|
|
|
|
/* Verify that new destination is available. */
|
|
memset(&tuple.ipv4.saddr, 0, sizeof(tuple.ipv4.saddr));
|
|
memset(&tuple.ipv4.sport, 0, sizeof(tuple.ipv4.sport));
|
|
|
|
tuple.ipv4.daddr = bpf_htonl(DST_REWRITE_IP4);
|
|
tuple.ipv4.dport = bpf_htons(DST_REWRITE_PORT4);
|
|
|
|
if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
|
|
return 0;
|
|
else if (ctx->type == SOCK_STREAM)
|
|
sk = bpf_sk_lookup_tcp(ctx, &tuple, sizeof(tuple.ipv4), 0, 0);
|
|
else
|
|
sk = bpf_sk_lookup_udp(ctx, &tuple, sizeof(tuple.ipv4), 0, 0);
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
if (sk->src_ip4 != tuple.ipv4.daddr ||
|
|
sk->src_port != DST_REWRITE_PORT4) {
|
|
bpf_sk_release(sk);
|
|
return 0;
|
|
}
|
|
|
|
bpf_sk_release(sk);
|
|
|
|
/* Rewrite destination. */
|
|
ctx->user_ip4 = bpf_htonl(DST_REWRITE_IP4);
|
|
ctx->user_port = bpf_htons(DST_REWRITE_PORT4);
|
|
|
|
/* Rewrite source. */
|
|
memset(&sa, 0, sizeof(sa));
|
|
|
|
sa.sin_family = AF_INET;
|
|
sa.sin_port = bpf_htons(0);
|
|
sa.sin_addr.s_addr = bpf_htonl(SRC_REWRITE_IP4);
|
|
|
|
if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|