github.com/datadog/cilium@v1.6.12/bpf/lib/signal.h (about) 1 /* 2 * Copyright (C) 2019 Authors of Cilium 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #ifndef __LIB_SIGNAL_H_ 19 #define __LIB_SIGNAL_H_ 20 21 #include <bpf/api.h> 22 23 struct bpf_elf_map __section_maps SIGNAL_MAP = { 24 .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY, 25 .size_key = sizeof(__u32), 26 .size_value = sizeof(__u32), 27 .pinning = PIN_GLOBAL_NS, 28 .max_elem = __NR_CPUS__, 29 }; 30 31 enum { 32 SIGNAL_NAT_FILL_UP = 0, 33 }; 34 35 enum { 36 SIGNAL_NAT_PROTO_V4 = 0, 37 SIGNAL_NAT_PROTO_V6, 38 }; 39 40 struct signal_msg { 41 __u32 signal_nr; 42 union { 43 struct { 44 __u32 proto; 45 }; 46 }; 47 }; 48 49 static inline void send_signal(struct __sk_buff *skb, struct signal_msg *msg) 50 { 51 skb_event_output(skb, &SIGNAL_MAP, BPF_F_CURRENT_CPU, 52 msg, sizeof(*msg)); 53 } 54 55 static inline void send_signal_nat_fill_up(struct __sk_buff *skb, __u32 proto) 56 { 57 struct signal_msg msg = { 58 .signal_nr = SIGNAL_NAT_FILL_UP, 59 .proto = proto, 60 }; 61 62 send_signal(skb, &msg); 63 } 64 65 #endif /* __LIB_SIGNAL_H_ */