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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Tessares SA. */
/* Copyright (c) 2022, SUSE. */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_tcp_helpers.h"
char _license[] SEC("license") = "GPL";
__u32 token = 0;
struct mptcp_storage {
__u32 invoked;
__u32 is_mptcp;
struct sock *sk;
__u32 token;
struct sock *first;
char ca_name[TCP_CA_NAME_MAX];
};
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, struct mptcp_storage);
} socket_storage_map SEC(".maps");
SEC("sockops")
int _sockops(struct bpf_sock_ops *ctx)
{
struct mptcp_storage *storage;
struct mptcp_sock *msk;
int op = (int)ctx->op;
struct tcp_sock *tsk;
struct bpf_sock *sk;
bool is_mptcp;
if (op != BPF_SOCK_OPS_TCP_CONNECT_CB)
return 1;
sk = ctx->sk;
if (!sk)
return 1;
tsk = bpf_skc_to_tcp_sock(sk);
if (!tsk)
return 1;
is_mptcp = bpf_core_field_exists(tsk->is_mptcp) ? tsk->is_mptcp : 0;
if (!is_mptcp) {
storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
BPF_SK_STORAGE_GET_F_CREATE);
if (!storage)
return 1;
storage->token = 0;
__builtin_memset(storage->ca_name, 0, TCP_CA_NAME_MAX);
storage->first = NULL;
} else {
msk = bpf_skc_to_mptcp_sock(sk);
if (!msk)
return 1;
storage = bpf_sk_storage_get(&socket_storage_map, msk, 0,
BPF_SK_STORAGE_GET_F_CREATE);
if (!storage)
return 1;
storage->token = msk->token;
__builtin_memcpy(storage->ca_name, msk->ca_name, TCP_CA_NAME_MAX);
storage->first = msk->first;
}
storage->invoked++;
storage->is_mptcp = is_mptcp;
storage->sk = (struct sock *)sk;
return 1;
}
SEC("fentry/mptcp_pm_new_connection")
int BPF_PROG(trace_mptcp_pm_new_connection, struct mptcp_sock *msk,
const struct sock *ssk, int server_side)
{
if (!server_side)
token = msk->token;
return 0;
}
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