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TOMOYO Linux Cross Reference
Linux/include/uapi/linux/if_packet.h

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

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