Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __LINUX_IF_PACKET_H
2#define __LINUX_IF_PACKET_H
3
4#include <linux/types.h>
5
6struct sockaddr_pkt {
7 unsigned short spkt_family;
8 unsigned char spkt_device[14];
9 __be16 spkt_protocol;
10};
11
12struct sockaddr_ll {
13 unsigned short sll_family;
14 __be16 sll_protocol;
15 int sll_ifindex;
16 unsigned short sll_hatype;
17 unsigned char sll_pkttype;
18 unsigned char sll_halen;
19 unsigned char sll_addr[8];
20};
21
22/* Packet types */
23
24#define PACKET_HOST 0 /* To us */
25#define PACKET_BROADCAST 1 /* To all */
26#define PACKET_MULTICAST 2 /* To group */
27#define PACKET_OTHERHOST 3 /* To someone else */
28#define PACKET_OUTGOING 4 /* Outgoing of any type */
29/* These ones are invisible by user level */
30#define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */
31#define PACKET_FASTROUTE 6 /* Fastrouted frame */
32
33/* Packet socket options */
34
35#define PACKET_ADD_MEMBERSHIP 1
36#define PACKET_DROP_MEMBERSHIP 2
37#define PACKET_RECV_OUTPUT 3
38/* Value 4 is still used by obsolete turbo-packet. */
39#define PACKET_RX_RING 5
40#define PACKET_STATISTICS 6
41#define PACKET_COPY_THRESH 7
42#define PACKET_AUXDATA 8
43#define PACKET_ORIGDEV 9
44#define PACKET_VERSION 10
45#define PACKET_HDRLEN 11
46#define PACKET_RESERVE 12
47#define PACKET_TX_RING 13
48#define PACKET_LOSS 14
49#define PACKET_VNET_HDR 15
50#define PACKET_TX_TIMESTAMP 16
51#define PACKET_TIMESTAMP 17
52#define PACKET_FANOUT 18
53#define PACKET_TX_HAS_OFF 19
54
55#define PACKET_FANOUT_HASH 0
56#define PACKET_FANOUT_LB 1
57#define PACKET_FANOUT_CPU 2
58#define PACKET_FANOUT_FLAG_DEFRAG 0x8000
59
60struct tpacket_stats {
61 unsigned int tp_packets;
62 unsigned int tp_drops;
63};
64
65struct tpacket_stats_v3 {
66 unsigned int tp_packets;
67 unsigned int tp_drops;
68 unsigned int tp_freeze_q_cnt;
69};
70
71union tpacket_stats_u {
72 struct tpacket_stats stats1;
73 struct tpacket_stats_v3 stats3;
74};
75
76struct tpacket_auxdata {
77 __u32 tp_status;
78 __u32 tp_len;
79 __u32 tp_snaplen;
80 __u16 tp_mac;
81 __u16 tp_net;
82 __u16 tp_vlan_tci;
83 __u16 tp_padding;
84};
85
86/* Rx ring - header status */
87#define TP_STATUS_KERNEL 0x0
88#define TP_STATUS_USER 0x1
89#define TP_STATUS_COPY 0x2
90#define TP_STATUS_LOSING 0x4
91#define TP_STATUS_CSUMNOTREADY 0x8
92#define TP_STATUS_VLAN_VALID 0x10 /* auxdata has valid tp_vlan_tci */
93#define TP_STATUS_BLK_TMO 0x20
94
95/* Tx ring - header status */
96#define TP_STATUS_AVAILABLE 0x0
97#define TP_STATUS_SEND_REQUEST 0x1
98#define TP_STATUS_SENDING 0x2
99#define TP_STATUS_WRONG_FORMAT 0x4
100
101/* Rx ring - feature request bits */
102#define TP_FT_REQ_FILL_RXHASH 0x1
103
104struct tpacket_hdr {
105 unsigned long tp_status;
106 unsigned int tp_len;
107 unsigned int tp_snaplen;
108 unsigned short tp_mac;
109 unsigned short tp_net;
110 unsigned int tp_sec;
111 unsigned int tp_usec;
112};
113
114#define TPACKET_ALIGNMENT 16
115#define TPACKET_ALIGN(x) (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
116#define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
117
118struct tpacket2_hdr {
119 __u32 tp_status;
120 __u32 tp_len;
121 __u32 tp_snaplen;
122 __u16 tp_mac;
123 __u16 tp_net;
124 __u32 tp_sec;
125 __u32 tp_nsec;
126 __u16 tp_vlan_tci;
127 __u16 tp_padding;
128};
129
130struct tpacket_hdr_variant1 {
131 __u32 tp_rxhash;
132 __u32 tp_vlan_tci;
133};
134
135struct tpacket3_hdr {
136 __u32 tp_next_offset;
137 __u32 tp_sec;
138 __u32 tp_nsec;
139 __u32 tp_snaplen;
140 __u32 tp_len;
141 __u32 tp_status;
142 __u16 tp_mac;
143 __u16 tp_net;
144 /* pkt_hdr variants */
145 union {
146 struct tpacket_hdr_variant1 hv1;
147 };
148};
149
150struct tpacket_bd_ts {
151 unsigned int ts_sec;
152 union {
153 unsigned int ts_usec;
154 unsigned int ts_nsec;
155 };
156};
157
158struct tpacket_hdr_v1 {
159 __u32 block_status;
160 __u32 num_pkts;
161 __u32 offset_to_first_pkt;
162
163 /* Number of valid bytes (including padding)
164 * blk_len <= tp_block_size
165 */
166 __u32 blk_len;
167
168 /*
169 * Quite a few uses of sequence number:
170 * 1. Make sure cache flush etc worked.
171 * Well, one can argue - why not use the increasing ts below?
172 * But look at 2. below first.
173 * 2. When you pass around blocks to other user space decoders,
174 * you can see which blk[s] is[are] outstanding etc.
175 * 3. Validate kernel code.
176 */
177 __aligned_u64 seq_num;
178
179 /*
180 * ts_last_pkt:
181 *
182 * Case 1. Block has 'N'(N >=1) packets and TMO'd(timed out)
183 * ts_last_pkt == 'time-stamp of last packet' and NOT the
184 * time when the timer fired and the block was closed.
185 * By providing the ts of the last packet we can absolutely
186 * guarantee that time-stamp wise, the first packet in the
187 * next block will never precede the last packet of the
188 * previous block.
189 * Case 2. Block has zero packets and TMO'd
190 * ts_last_pkt = time when the timer fired and the block
191 * was closed.
192 * Case 3. Block has 'N' packets and NO TMO.
193 * ts_last_pkt = time-stamp of the last pkt in the block.
194 *
195 * ts_first_pkt:
196 * Is always the time-stamp when the block was opened.
197 * Case a) ZERO packets
198 * No packets to deal with but atleast you know the
199 * time-interval of this block.
200 * Case b) Non-zero packets
201 * Use the ts of the first packet in the block.
202 *
203 */
204 struct tpacket_bd_ts ts_first_pkt, ts_last_pkt;
205};
206
207union tpacket_bd_header_u {
208 struct tpacket_hdr_v1 bh1;
209};
210
211struct tpacket_block_desc {
212 __u32 version;
213 __u32 offset_to_priv;
214 union tpacket_bd_header_u hdr;
215};
216
217#define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))
218#define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
219
220enum tpacket_versions {
221 TPACKET_V1,
222 TPACKET_V2,
223 TPACKET_V3
224};
225
226/*
227 Frame structure:
228
229 - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
230 - struct tpacket_hdr
231 - pad to TPACKET_ALIGNMENT=16
232 - struct sockaddr_ll
233 - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
234 - Start+tp_mac: [ Optional MAC header ]
235 - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
236 - Pad to align to TPACKET_ALIGNMENT=16
237 */
238
239struct tpacket_req {
240 unsigned int tp_block_size; /* Minimal size of contiguous block */
241 unsigned int tp_block_nr; /* Number of blocks */
242 unsigned int tp_frame_size; /* Size of frame */
243 unsigned int tp_frame_nr; /* Total number of frames */
244};
245
246struct tpacket_req3 {
247 unsigned int tp_block_size; /* Minimal size of contiguous block */
248 unsigned int tp_block_nr; /* Number of blocks */
249 unsigned int tp_frame_size; /* Size of frame */
250 unsigned int tp_frame_nr; /* Total number of frames */
251 unsigned int tp_retire_blk_tov; /* timeout in msecs */
252 unsigned int tp_sizeof_priv; /* offset to private data area */
253 unsigned int tp_feature_req_word;
254};
255
256union tpacket_req_u {
257 struct tpacket_req req;
258 struct tpacket_req3 req3;
259};
260
261struct packet_mreq {
262 int mr_ifindex;
263 unsigned short mr_type;
264 unsigned short mr_alen;
265 unsigned char mr_address[8];
266};
267
268#define PACKET_MR_MULTICAST 0
269#define PACKET_MR_PROMISC 1
270#define PACKET_MR_ALLMULTI 2
271#define PACKET_MR_UNICAST 3
272
273#endif