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Linux/include/uapi/linux/if_packet.h

  1 #ifndef __LINUX_IF_PACKET_H
  2 #define __LINUX_IF_PACKET_H
  3 
  4 #include <linux/types.h>
  5 
  6 struct sockaddr_pkt {
  7         unsigned short spkt_family;
  8         unsigned char spkt_device[14];
  9         __be16 spkt_protocol;
 10 };
 11 
 12 struct 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 #define PACKET_LOOPBACK         5               /* MC/BRD frame looped back */
 30 #define PACKET_USER             6               /* To user space        */
 31 #define PACKET_KERNEL           7               /* To kernel space      */
 32 /* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */
 33 #define PACKET_FASTROUTE        6               /* Fastrouted frame     */
 34 
 35 /* Packet socket options */
 36 
 37 #define PACKET_ADD_MEMBERSHIP           1
 38 #define PACKET_DROP_MEMBERSHIP          2
 39 #define PACKET_RECV_OUTPUT              3
 40 /* Value 4 is still used by obsolete turbo-packet. */
 41 #define PACKET_RX_RING                  5
 42 #define PACKET_STATISTICS               6
 43 #define PACKET_COPY_THRESH              7
 44 #define PACKET_AUXDATA                  8
 45 #define PACKET_ORIGDEV                  9
 46 #define PACKET_VERSION                  10
 47 #define PACKET_HDRLEN                   11
 48 #define PACKET_RESERVE                  12
 49 #define PACKET_TX_RING                  13
 50 #define PACKET_LOSS                     14
 51 #define PACKET_VNET_HDR                 15
 52 #define PACKET_TX_TIMESTAMP             16
 53 #define PACKET_TIMESTAMP                17
 54 #define PACKET_FANOUT                   18
 55 #define PACKET_TX_HAS_OFF               19
 56 #define PACKET_QDISC_BYPASS             20
 57 #define PACKET_ROLLOVER_STATS           21
 58 #define PACKET_FANOUT_DATA              22
 59 
 60 #define PACKET_FANOUT_HASH              0
 61 #define PACKET_FANOUT_LB                1
 62 #define PACKET_FANOUT_CPU               2
 63 #define PACKET_FANOUT_ROLLOVER          3
 64 #define PACKET_FANOUT_RND               4
 65 #define PACKET_FANOUT_QM                5
 66 #define PACKET_FANOUT_CBPF              6
 67 #define PACKET_FANOUT_EBPF              7
 68 #define PACKET_FANOUT_FLAG_ROLLOVER     0x1000
 69 #define PACKET_FANOUT_FLAG_DEFRAG       0x8000
 70 
 71 struct tpacket_stats {
 72         unsigned int    tp_packets;
 73         unsigned int    tp_drops;
 74 };
 75 
 76 struct tpacket_stats_v3 {
 77         unsigned int    tp_packets;
 78         unsigned int    tp_drops;
 79         unsigned int    tp_freeze_q_cnt;
 80 };
 81 
 82 struct tpacket_rollover_stats {
 83         __aligned_u64   tp_all;
 84         __aligned_u64   tp_huge;
 85         __aligned_u64   tp_failed;
 86 };
 87 
 88 union tpacket_stats_u {
 89         struct tpacket_stats stats1;
 90         struct tpacket_stats_v3 stats3;
 91 };
 92 
 93 struct tpacket_auxdata {
 94         __u32           tp_status;
 95         __u32           tp_len;
 96         __u32           tp_snaplen;
 97         __u16           tp_mac;
 98         __u16           tp_net;
 99         __u16           tp_vlan_tci;
100         __u16           tp_vlan_tpid;
101 };
102 
103 /* Rx ring - header status */
104 #define TP_STATUS_KERNEL                      0
105 #define TP_STATUS_USER                  (1 << 0)
106 #define TP_STATUS_COPY                  (1 << 1)
107 #define TP_STATUS_LOSING                (1 << 2)
108 #define TP_STATUS_CSUMNOTREADY          (1 << 3)
109 #define TP_STATUS_VLAN_VALID            (1 << 4) /* auxdata has valid tp_vlan_tci */
110 #define TP_STATUS_BLK_TMO               (1 << 5)
111 #define TP_STATUS_VLAN_TPID_VALID       (1 << 6) /* auxdata has valid tp_vlan_tpid */
112 #define TP_STATUS_CSUM_VALID            (1 << 7)
113 
114 /* Tx ring - header status */
115 #define TP_STATUS_AVAILABLE           0
116 #define TP_STATUS_SEND_REQUEST  (1 << 0)
117 #define TP_STATUS_SENDING       (1 << 1)
118 #define TP_STATUS_WRONG_FORMAT  (1 << 2)
119 
120 /* Rx and Tx ring - header status */
121 #define TP_STATUS_TS_SOFTWARE           (1 << 29)
122 #define TP_STATUS_TS_SYS_HARDWARE       (1 << 30) /* deprecated, never set */
123 #define TP_STATUS_TS_RAW_HARDWARE       (1 << 31)
124 
125 /* Rx ring - feature request bits */
126 #define TP_FT_REQ_FILL_RXHASH   0x1
127 
128 struct tpacket_hdr {
129         unsigned long   tp_status;
130         unsigned int    tp_len;
131         unsigned int    tp_snaplen;
132         unsigned short  tp_mac;
133         unsigned short  tp_net;
134         unsigned int    tp_sec;
135         unsigned int    tp_usec;
136 };
137 
138 #define TPACKET_ALIGNMENT       16
139 #define TPACKET_ALIGN(x)        (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
140 #define TPACKET_HDRLEN          (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
141 
142 struct tpacket2_hdr {
143         __u32           tp_status;
144         __u32           tp_len;
145         __u32           tp_snaplen;
146         __u16           tp_mac;
147         __u16           tp_net;
148         __u32           tp_sec;
149         __u32           tp_nsec;
150         __u16           tp_vlan_tci;
151         __u16           tp_vlan_tpid;
152         __u8            tp_padding[4];
153 };
154 
155 struct tpacket_hdr_variant1 {
156         __u32   tp_rxhash;
157         __u32   tp_vlan_tci;
158         __u16   tp_vlan_tpid;
159         __u16   tp_padding;
160 };
161 
162 struct tpacket3_hdr {
163         __u32           tp_next_offset;
164         __u32           tp_sec;
165         __u32           tp_nsec;
166         __u32           tp_snaplen;
167         __u32           tp_len;
168         __u32           tp_status;
169         __u16           tp_mac;
170         __u16           tp_net;
171         /* pkt_hdr variants */
172         union {
173                 struct tpacket_hdr_variant1 hv1;
174         };
175         __u8            tp_padding[8];
176 };
177 
178 struct tpacket_bd_ts {
179         unsigned int ts_sec;
180         union {
181                 unsigned int ts_usec;
182                 unsigned int ts_nsec;
183         };
184 };
185 
186 struct tpacket_hdr_v1 {
187         __u32   block_status;
188         __u32   num_pkts;
189         __u32   offset_to_first_pkt;
190 
191         /* Number of valid bytes (including padding)
192          * blk_len <= tp_block_size
193          */
194         __u32   blk_len;
195 
196         /*
197          * Quite a few uses of sequence number:
198          * 1. Make sure cache flush etc worked.
199          *    Well, one can argue - why not use the increasing ts below?
200          *    But look at 2. below first.
201          * 2. When you pass around blocks to other user space decoders,
202          *    you can see which blk[s] is[are] outstanding etc.
203          * 3. Validate kernel code.
204          */
205         __aligned_u64   seq_num;
206 
207         /*
208          * ts_last_pkt:
209          *
210          * Case 1.      Block has 'N'(N >=1) packets and TMO'd(timed out)
211          *              ts_last_pkt == 'time-stamp of last packet' and NOT the
212          *              time when the timer fired and the block was closed.
213          *              By providing the ts of the last packet we can absolutely
214          *              guarantee that time-stamp wise, the first packet in the
215          *              next block will never precede the last packet of the
216          *              previous block.
217          * Case 2.      Block has zero packets and TMO'd
218          *              ts_last_pkt = time when the timer fired and the block
219          *              was closed.
220          * Case 3.      Block has 'N' packets and NO TMO.
221          *              ts_last_pkt = time-stamp of the last pkt in the block.
222          *
223          * ts_first_pkt:
224          *              Is always the time-stamp when the block was opened.
225          *              Case a) ZERO packets
226          *                      No packets to deal with but atleast you know the
227          *                      time-interval of this block.
228          *              Case b) Non-zero packets
229          *                      Use the ts of the first packet in the block.
230          *
231          */
232         struct tpacket_bd_ts    ts_first_pkt, ts_last_pkt;
233 };
234 
235 union tpacket_bd_header_u {
236         struct tpacket_hdr_v1 bh1;
237 };
238 
239 struct tpacket_block_desc {
240         __u32 version;
241         __u32 offset_to_priv;
242         union tpacket_bd_header_u hdr;
243 };
244 
245 #define TPACKET2_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))
246 #define TPACKET3_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
247 
248 enum tpacket_versions {
249         TPACKET_V1,
250         TPACKET_V2,
251         TPACKET_V3
252 };
253 
254 /*
255    Frame structure:
256 
257    - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
258    - struct tpacket_hdr
259    - pad to TPACKET_ALIGNMENT=16
260    - struct sockaddr_ll
261    - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
262    - Start+tp_mac: [ Optional MAC header ]
263    - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
264    - Pad to align to TPACKET_ALIGNMENT=16
265  */
266 
267 struct tpacket_req {
268         unsigned int    tp_block_size;  /* Minimal size of contiguous block */
269         unsigned int    tp_block_nr;    /* Number of blocks */
270         unsigned int    tp_frame_size;  /* Size of frame */
271         unsigned int    tp_frame_nr;    /* Total number of frames */
272 };
273 
274 struct tpacket_req3 {
275         unsigned int    tp_block_size;  /* Minimal size of contiguous block */
276         unsigned int    tp_block_nr;    /* Number of blocks */
277         unsigned int    tp_frame_size;  /* Size of frame */
278         unsigned int    tp_frame_nr;    /* Total number of frames */
279         unsigned int    tp_retire_blk_tov; /* timeout in msecs */
280         unsigned int    tp_sizeof_priv; /* offset to private data area */
281         unsigned int    tp_feature_req_word;
282 };
283 
284 union tpacket_req_u {
285         struct tpacket_req      req;
286         struct tpacket_req3     req3;
287 };
288 
289 struct packet_mreq {
290         int             mr_ifindex;
291         unsigned short  mr_type;
292         unsigned short  mr_alen;
293         unsigned char   mr_address[8];
294 };
295 
296 #define PACKET_MR_MULTICAST     0
297 #define PACKET_MR_PROMISC       1
298 #define PACKET_MR_ALLMULTI      2
299 #define PACKET_MR_UNICAST       3
300 
301 #endif
302 

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