1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020, Tessares SA. */ 3 /* Copyright (c) 2022, SUSE. */ 4 5 #include <linux/bpf.h> 6 #include <bpf/bpf_helpers.h> 7 #include "bpf_tcp_helpers.h" 8 9 char _license[] SEC("license") = "GPL"; 10 __u32 token = 0; 11 12 struct mptcp_storage { 13 __u32 invoked; 14 __u32 is_mptcp; 15 struct sock *sk; 16 __u32 token; 17 struct sock *first; 18 char ca_name[TCP_CA_NAME_MAX]; 19 }; 20 21 struct { 22 __uint(type, BPF_MAP_TYPE_SK_STORAGE); 23 __uint(map_flags, BPF_F_NO_PREALLOC); 24 __type(key, int); 25 __type(value, struct mptcp_storage); 26 } socket_storage_map SEC(".maps"); 27 28 SEC("sockops") 29 int _sockops(struct bpf_sock_ops *ctx) 30 { 31 struct mptcp_storage *storage; 32 struct mptcp_sock *msk; 33 int op = (int)ctx->op; 34 struct tcp_sock *tsk; 35 struct bpf_sock *sk; 36 bool is_mptcp; 37 38 if (op != BPF_SOCK_OPS_TCP_CONNECT_CB) 39 return 1; 40 41 sk = ctx->sk; 42 if (!sk) 43 return 1; 44 45 tsk = bpf_skc_to_tcp_sock(sk); 46 if (!tsk) 47 return 1; 48 49 is_mptcp = bpf_core_field_exists(tsk->is_mptcp) ? tsk->is_mptcp : 0; 50 if (!is_mptcp) { 51 storage = bpf_sk_storage_get(&socket_storage_map, sk, 0, 52 BPF_SK_STORAGE_GET_F_CREATE); 53 if (!storage) 54 return 1; 55 56 storage->token = 0; 57 __builtin_memset(storage->ca_name, 0, TCP_CA_NAME_MAX); 58 storage->first = NULL; 59 } else { 60 msk = bpf_skc_to_mptcp_sock(sk); 61 if (!msk) 62 return 1; 63 64 storage = bpf_sk_storage_get(&socket_storage_map, msk, 0, 65 BPF_SK_STORAGE_GET_F_CREATE); 66 if (!storage) 67 return 1; 68 69 storage->token = msk->token; 70 __builtin_memcpy(storage->ca_name, msk->ca_name, TCP_CA_NAME_MAX); 71 storage->first = msk->first; 72 } 73 storage->invoked++; 74 storage->is_mptcp = is_mptcp; 75 storage->sk = (struct sock *)sk; 76 77 return 1; 78 } 79 80 SEC("fentry/mptcp_pm_new_connection") 81 int BPF_PROG(trace_mptcp_pm_new_connection, struct mptcp_sock *msk, 82 const struct sock *ssk, int server_side) 83 { 84 if (!server_side) 85 token = msk->token; 86 87 return 0; 88 } 89