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001: #ifndef __LINUX_IF_PACKET_H
002: #define __LINUX_IF_PACKET_H
003: 
004: #include <linux/types.h>
005: 
006: struct sockaddr_pkt {
007:         unsigned short spkt_family;
008:         unsigned char spkt_device[14];
009:         __be16 spkt_protocol;
010: };
011: 
012: struct sockaddr_ll {
013:         unsigned short  sll_family;
014:         __be16          sll_protocol;
015:         int             sll_ifindex;
016:         unsigned short  sll_hatype;
017:         unsigned char   sll_pkttype;
018:         unsigned char   sll_halen;
019:         unsigned char   sll_addr[8];
020: };
021: 
022: /* Packet types */
023: 
024: #define PACKET_HOST             0               /* To us                */
025: #define PACKET_BROADCAST        1               /* To all               */
026: #define PACKET_MULTICAST        2               /* To group             */
027: #define PACKET_OTHERHOST        3               /* To someone else      */
028: #define PACKET_OUTGOING         4               /* Outgoing of any type */
029: /* These ones are invisible by user level */
030: #define PACKET_LOOPBACK         5               /* MC/BRD frame looped back */
031: #define PACKET_FASTROUTE        6               /* Fastrouted frame     */
032: 
033: /* Packet socket options */
034: 
035: #define PACKET_ADD_MEMBERSHIP           1
036: #define PACKET_DROP_MEMBERSHIP          2
037: #define PACKET_RECV_OUTPUT              3
038: /* Value 4 is still used by obsolete turbo-packet. */
039: #define PACKET_RX_RING                  5
040: #define PACKET_STATISTICS               6
041: #define PACKET_COPY_THRESH              7
042: #define PACKET_AUXDATA                  8
043: #define PACKET_ORIGDEV                  9
044: #define PACKET_VERSION                  10
045: #define PACKET_HDRLEN                   11
046: #define PACKET_RESERVE                  12
047: #define PACKET_TX_RING                  13
048: #define PACKET_LOSS                     14
049: #define PACKET_VNET_HDR                 15
050: #define PACKET_TX_TIMESTAMP             16
051: #define PACKET_TIMESTAMP                17
052: #define PACKET_FANOUT                   18
053: 
054: #define PACKET_FANOUT_HASH              0
055: #define PACKET_FANOUT_LB                1
056: #define PACKET_FANOUT_CPU               2
057: #define PACKET_FANOUT_FLAG_DEFRAG       0x8000
058: 
059: struct tpacket_stats {
060:         unsigned int    tp_packets;
061:         unsigned int    tp_drops;
062: };
063: 
064: struct tpacket_stats_v3 {
065:         unsigned int    tp_packets;
066:         unsigned int    tp_drops;
067:         unsigned int    tp_freeze_q_cnt;
068: };
069: 
070: union tpacket_stats_u {
071:         struct tpacket_stats stats1;
072:         struct tpacket_stats_v3 stats3;
073: };
074: 
075: struct tpacket_auxdata {
076:         __u32           tp_status;
077:         __u32           tp_len;
078:         __u32           tp_snaplen;
079:         __u16           tp_mac;
080:         __u16           tp_net;
081:         __u16           tp_vlan_tci;
082:         __u16           tp_padding;
083: };
084: 
085: /* Rx ring - header status */
086: #define TP_STATUS_KERNEL        0x0
087: #define TP_STATUS_USER          0x1
088: #define TP_STATUS_COPY          0x2
089: #define TP_STATUS_LOSING        0x4
090: #define TP_STATUS_CSUMNOTREADY  0x8
091: #define TP_STATUS_VLAN_VALID   0x10 /* auxdata has valid tp_vlan_tci */
092: #define TP_STATUS_BLK_TMO       0x20
093: 
094: /* Tx ring - header status */
095: #define TP_STATUS_AVAILABLE     0x0
096: #define TP_STATUS_SEND_REQUEST  0x1
097: #define TP_STATUS_SENDING       0x2
098: #define TP_STATUS_WRONG_FORMAT  0x4
099: 
100: /* Rx ring - feature request bits */
101: #define TP_FT_REQ_FILL_RXHASH   0x1
102: 
103: struct tpacket_hdr {
104:         unsigned long   tp_status;
105:         unsigned int    tp_len;
106:         unsigned int    tp_snaplen;
107:         unsigned short  tp_mac;
108:         unsigned short  tp_net;
109:         unsigned int    tp_sec;
110:         unsigned int    tp_usec;
111: };
112: 
113: #define TPACKET_ALIGNMENT       16
114: #define TPACKET_ALIGN(x)        (((x)+TPACKET_ALIGNMENT-1)&~(TPACKET_ALIGNMENT-1))
115: #define TPACKET_HDRLEN          (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
116: 
117: struct tpacket2_hdr {
118:         __u32           tp_status;
119:         __u32           tp_len;
120:         __u32           tp_snaplen;
121:         __u16           tp_mac;
122:         __u16           tp_net;
123:         __u32           tp_sec;
124:         __u32           tp_nsec;
125:         __u16           tp_vlan_tci;
126:         __u16           tp_padding;
127: };
128: 
129: struct tpacket_hdr_variant1 {
130:         __u32   tp_rxhash;
131:         __u32   tp_vlan_tci;
132: };
133: 
134: struct tpacket3_hdr {
135:         __u32           tp_next_offset;
136:         __u32           tp_sec;
137:         __u32           tp_nsec;
138:         __u32           tp_snaplen;
139:         __u32           tp_len;
140:         __u32           tp_status;
141:         __u16           tp_mac;
142:         __u16           tp_net;
143:         /* pkt_hdr variants */
144:         union {
145:                 struct tpacket_hdr_variant1 hv1;
146:         };
147: };
148: 
149: struct tpacket_bd_ts {
150:         unsigned int ts_sec;
151:         union {
152:                 unsigned int ts_usec;
153:                 unsigned int ts_nsec;
154:         };
155: };
156: 
157: struct tpacket_hdr_v1 {
158:         __u32   block_status;
159:         __u32   num_pkts;
160:         __u32   offset_to_first_pkt;
161: 
162:         /* Number of valid bytes (including padding)
163:          * blk_len <= tp_block_size
164:          */
165:         __u32   blk_len;
166: 
167:         /*
168:          * Quite a few uses of sequence number:
169:          * 1. Make sure cache flush etc worked.
170:          *    Well, one can argue - why not use the increasing ts below?
171:          *    But look at 2. below first.
172:          * 2. When you pass around blocks to other user space decoders,
173:          *    you can see which blk[s] is[are] outstanding etc.
174:          * 3. Validate kernel code.
175:          */
176:         __aligned_u64   seq_num;
177: 
178:         /*
179:          * ts_last_pkt:
180:          *
181:          * Case 1.      Block has 'N'(N >=1) packets and TMO'd(timed out)
182:          *              ts_last_pkt == 'time-stamp of last packet' and NOT the
183:          *              time when the timer fired and the block was closed.
184:          *              By providing the ts of the last packet we can absolutely
185:          *              guarantee that time-stamp wise, the first packet in the
186:          *              next block will never precede the last packet of the
187:          *              previous block.
188:          * Case 2.      Block has zero packets and TMO'd
189:          *              ts_last_pkt = time when the timer fired and the block
190:          *              was closed.
191:          * Case 3.      Block has 'N' packets and NO TMO.
192:          *              ts_last_pkt = time-stamp of the last pkt in the block.
193:          *
194:          * ts_first_pkt:
195:          *              Is always the time-stamp when the block was opened.
196:          *              Case a) ZERO packets
197:          *                      No packets to deal with but atleast you know the
198:          *                      time-interval of this block.
199:          *              Case b) Non-zero packets
200:          *                      Use the ts of the first packet in the block.
201:          *
202:          */
203:         struct tpacket_bd_ts    ts_first_pkt, ts_last_pkt;
204: };
205: 
206: union tpacket_bd_header_u {
207:         struct tpacket_hdr_v1 bh1;
208: };
209: 
210: struct tpacket_block_desc {
211:         __u32 version;
212:         __u32 offset_to_priv;
213:         union tpacket_bd_header_u hdr;
214: };
215: 
216: #define TPACKET2_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))
217: #define TPACKET3_HDRLEN         (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
218: 
219: enum tpacket_versions {
220:         TPACKET_V1,
221:         TPACKET_V2,
222:         TPACKET_V3
223: };
224: 
225: /*
226:    Frame structure:
227: 
228:    - Start. Frame must be aligned to TPACKET_ALIGNMENT=16
229:    - struct tpacket_hdr
230:    - pad to TPACKET_ALIGNMENT=16
231:    - struct sockaddr_ll
232:    - Gap, chosen so that packet data (Start+tp_net) alignes to TPACKET_ALIGNMENT=16
233:    - Start+tp_mac: [ Optional MAC header ]
234:    - Start+tp_net: Packet data, aligned to TPACKET_ALIGNMENT=16.
235:    - Pad to align to TPACKET_ALIGNMENT=16
236:  */
237: 
238: struct tpacket_req {
239:         unsigned int    tp_block_size;  /* Minimal size of contiguous block */
240:         unsigned int    tp_block_nr;    /* Number of blocks */
241:         unsigned int    tp_frame_size;  /* Size of frame */
242:         unsigned int    tp_frame_nr;    /* Total number of frames */
243: };
244: 
245: struct tpacket_req3 {
246:         unsigned int    tp_block_size;  /* Minimal size of contiguous block */
247:         unsigned int    tp_block_nr;    /* Number of blocks */
248:         unsigned int    tp_frame_size;  /* Size of frame */
249:         unsigned int    tp_frame_nr;    /* Total number of frames */
250:         unsigned int    tp_retire_blk_tov; /* timeout in msecs */
251:         unsigned int    tp_sizeof_priv; /* offset to private data area */
252:         unsigned int    tp_feature_req_word;
253: };
254: 
255: union tpacket_req_u {
256:         struct tpacket_req      req;
257:         struct tpacket_req3     req3;
258: };
259: 
260: struct packet_mreq {
261:         int             mr_ifindex;
262:         unsigned short  mr_type;
263:         unsigned short  mr_alen;
264:         unsigned char   mr_address[8];
265: };
266: 
267: #define PACKET_MR_MULTICAST     0
268: #define PACKET_MR_PROMISC       1
269: #define PACKET_MR_ALLMULTI      2
270: #define PACKET_MR_UNICAST       3
271: 
272: #endif
273: 

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