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1 1 : /*
2 : * Copyright (c) 2016 Intel Corporation.
3 : *
4 : * SPDX-License-Identifier: Apache-2.0
5 : */
6 :
7 : /**
8 : * @file
9 : * @brief Public API for network L2 interface
10 : */
11 :
12 : #ifndef ZEPHYR_INCLUDE_NET_NET_L2_H_
13 : #define ZEPHYR_INCLUDE_NET_NET_L2_H_
14 :
15 : #include <zephyr/device.h>
16 : #include <zephyr/net_buf.h>
17 : #include <zephyr/net/net_ip.h>
18 : #include <zephyr/net/capture.h>
19 : #include <zephyr/sys/iterable_sections.h>
20 :
21 : #ifdef __cplusplus
22 : extern "C" {
23 : #endif
24 :
25 : /**
26 : * @brief Network Layer 2 abstraction layer
27 : * @defgroup net_l2 Network L2 Abstraction Layer
28 : * @since 1.5
29 : * @version 1.0.0
30 : * @ingroup networking
31 : * @{
32 : */
33 :
34 : struct net_if;
35 :
36 : /** L2 flags */
37 1 : enum net_l2_flags {
38 : /** IP multicast supported */
39 : NET_L2_MULTICAST = BIT(0),
40 :
41 : /** Do not join solicited node multicast group */
42 : NET_L2_MULTICAST_SKIP_JOIN_SOLICIT_NODE = BIT(1),
43 :
44 : /** Is promiscuous mode supported */
45 : NET_L2_PROMISC_MODE = BIT(2),
46 :
47 : /** Is this L2 point-to-point with tunneling so no need to have
48 : * IP address etc to network interface.
49 : */
50 : NET_L2_POINT_TO_POINT = BIT(3),
51 : } __packed;
52 :
53 : /**
54 : * @brief Network L2 structure
55 : *
56 : * Used to provide an interface to lower network stack.
57 : */
58 1 : struct net_l2 {
59 : /**
60 : * This function is used by net core to get iface's L2 layer parsing
61 : * what's relevant to itself.
62 : */
63 : enum net_verdict (*recv)(struct net_if *iface, struct net_pkt *pkt);
64 :
65 : /**
66 : * This function is used by net core to push a packet to lower layer
67 : * (interface's L2), which in turn might work on the packet relevantly.
68 : * (adding proper header etc...)
69 : * Returns a negative error code, or 0 if the packet was accepted.
70 : */
71 1 : int (*send)(struct net_if *iface, struct net_pkt *pkt);
72 :
73 : /**
74 : * This function is used to enable/disable traffic over a network
75 : * interface. The function returns <0 if error and >=0 if no error.
76 : */
77 1 : int (*enable)(struct net_if *iface, bool state);
78 :
79 : /**
80 : * Return L2 flags for the network interface.
81 : */
82 : enum net_l2_flags (*get_flags)(struct net_if *iface);
83 :
84 : /**
85 : * Optional function for reserving L2 header space for this technology.
86 : */
87 1 : int (*alloc)(struct net_if *iface, struct net_pkt *pkt,
88 : size_t size, enum net_ip_protocol proto,
89 : k_timeout_t timeout);
90 : };
91 :
92 : /** @cond INTERNAL_HIDDEN */
93 : #define NET_L2_GET_NAME(_name) _net_l2_##_name
94 : #define NET_L2_DECLARE_PUBLIC(_name) \
95 : extern const struct net_l2 NET_L2_GET_NAME(_name)
96 : #define NET_L2_GET_CTX_TYPE(_name) _name##_CTX_TYPE
97 :
98 : #define VIRTUAL_L2 VIRTUAL
99 : NET_L2_DECLARE_PUBLIC(VIRTUAL_L2);
100 :
101 : #define DUMMY_L2 DUMMY
102 : #define DUMMY_L2_CTX_TYPE void*
103 : NET_L2_DECLARE_PUBLIC(DUMMY_L2);
104 :
105 : #define OFFLOADED_NETDEV_L2 OFFLOADED_NETDEV
106 : NET_L2_DECLARE_PUBLIC(OFFLOADED_NETDEV_L2);
107 :
108 : #define ETHERNET_L2 ETHERNET
109 : NET_L2_DECLARE_PUBLIC(ETHERNET_L2);
110 :
111 : #define PPP_L2 PPP
112 : NET_L2_DECLARE_PUBLIC(PPP_L2);
113 :
114 : #define IEEE802154_L2 IEEE802154
115 : NET_L2_DECLARE_PUBLIC(IEEE802154_L2);
116 :
117 : #define OPENTHREAD_L2 OPENTHREAD
118 : NET_L2_DECLARE_PUBLIC(OPENTHREAD_L2);
119 :
120 : #define CANBUS_RAW_L2 CANBUS_RAW
121 : #define CANBUS_RAW_L2_CTX_TYPE void*
122 : NET_L2_DECLARE_PUBLIC(CANBUS_RAW_L2);
123 :
124 : #ifdef CONFIG_NET_L2_CUSTOM_IEEE802154
125 : #ifndef CUSTOM_IEEE802154_L2
126 : #define CUSTOM_IEEE802154_L2 CUSTOM_IEEE802154
127 : #endif
128 : #define CUSTOM_IEEE802154_L2_CTX_TYPE void*
129 : NET_L2_DECLARE_PUBLIC(CUSTOM_IEEE802154_L2);
130 : #endif /* CONFIG_NET_L2_CUSTOM_IEEE802154 */
131 :
132 : #define NET_L2_INIT(_name, _recv_fn, _send_fn, _enable_fn, _get_flags_fn, ...) \
133 : const STRUCT_SECTION_ITERABLE(net_l2, \
134 : NET_L2_GET_NAME(_name)) = { \
135 : .recv = (_recv_fn), \
136 : .send = (_send_fn), \
137 : .enable = (_enable_fn), \
138 : .get_flags = (_get_flags_fn), \
139 : .alloc = COND_CODE_0(NUM_VA_ARGS_LESS_1(LIST_DROP_EMPTY(__VA_ARGS__, _)), \
140 : (NULL), \
141 : (GET_ARG_N(1, __VA_ARGS__))), \
142 : }
143 :
144 : #define NET_L2_GET_DATA(name, sfx) _net_l2_data_##name##sfx
145 :
146 : #define NET_L2_DATA_INIT(name, sfx, ctx_type) \
147 : static ctx_type NET_L2_GET_DATA(name, sfx) __used;
148 :
149 : typedef int (*net_l2_send_t)(const struct device *dev, struct net_pkt *pkt);
150 :
151 : static inline int net_l2_send(net_l2_send_t send_fn,
152 : const struct device *dev,
153 : struct net_if *iface,
154 : struct net_pkt *pkt)
155 : {
156 : net_capture_pkt(iface, pkt);
157 :
158 : return send_fn(dev, pkt);
159 : }
160 :
161 : /** @endcond */
162 :
163 : /**
164 : * @}
165 : */
166 :
167 : #ifdef __cplusplus
168 : }
169 : #endif
170 :
171 : #endif /* ZEPHYR_INCLUDE_NET_NET_L2_H_ */
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