1 /* 2 * QEMU RX packets abstraction 3 * 4 * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com) 5 * 6 * Developed by Daynix Computing LTD (http://www.daynix.com) 7 * 8 * Authors: 9 * Dmitry Fleytman <dmitry@daynix.com> 10 * Tamir Shomer <tamirs@daynix.com> 11 * Yan Vugenfirer <yan@daynix.com> 12 * 13 * This work is licensed under the terms of the GNU GPL, version 2 or later. 14 * See the COPYING file in the top-level directory. 15 * 16 */ 17 18 #ifndef NET_RX_PKT_H 19 #define NET_RX_PKT_H 20 21 #include "net/eth.h" 22 23 /* defines to enable packet dump functions */ 24 /*#define NET_RX_PKT_DEBUG*/ 25 26 struct NetRxPkt; 27 28 /** 29 * Clean all rx packet resources 30 * 31 * @pkt: packet 32 * 33 */ 34 void net_rx_pkt_uninit(struct NetRxPkt *pkt); 35 36 /** 37 * Init function for rx packet functionality 38 * 39 * @pkt: packet pointer 40 * @has_virt_hdr: device uses virtio header 41 * 42 */ 43 void net_rx_pkt_init(struct NetRxPkt **pkt, bool has_virt_hdr); 44 45 /** 46 * returns total length of data attached to rx context 47 * 48 * @pkt: packet 49 * 50 * Return: nothing 51 * 52 */ 53 size_t net_rx_pkt_get_total_len(struct NetRxPkt *pkt); 54 55 /** 56 * parse and set packet analysis results 57 * 58 * @pkt: packet 59 * @data: pointer to the data buffer to be parsed 60 * @len: data length 61 * 62 */ 63 void net_rx_pkt_set_protocols(struct NetRxPkt *pkt, const void *data, 64 size_t len); 65 66 /** 67 * fetches packet analysis results 68 * 69 * @pkt: packet 70 * @isip4: whether the packet given is IPv4 71 * @isip6: whether the packet given is IPv6 72 * @isudp: whether the packet given is UDP 73 * @istcp: whether the packet given is TCP 74 * 75 */ 76 void net_rx_pkt_get_protocols(struct NetRxPkt *pkt, 77 bool *isip4, bool *isip6, 78 bool *isudp, bool *istcp); 79 80 /** 81 * fetches L3 header offset 82 * 83 * @pkt: packet 84 * 85 */ 86 size_t net_rx_pkt_get_l3_hdr_offset(struct NetRxPkt *pkt); 87 88 /** 89 * fetches L4 header offset 90 * 91 * @pkt: packet 92 * 93 */ 94 size_t net_rx_pkt_get_l4_hdr_offset(struct NetRxPkt *pkt); 95 96 /** 97 * fetches L5 header offset 98 * 99 * @pkt: packet 100 * 101 */ 102 size_t net_rx_pkt_get_l5_hdr_offset(struct NetRxPkt *pkt); 103 104 /** 105 * fetches IP6 header analysis results 106 * 107 * Return: pointer to analysis results structure which is stored in internal 108 * packet area. 109 * 110 */ 111 eth_ip6_hdr_info *net_rx_pkt_get_ip6_info(struct NetRxPkt *pkt); 112 113 /** 114 * fetches IP4 header analysis results 115 * 116 * Return: pointer to analysis results structure which is stored in internal 117 * packet area. 118 * 119 */ 120 eth_ip4_hdr_info *net_rx_pkt_get_ip4_info(struct NetRxPkt *pkt); 121 122 /** 123 * fetches L4 header analysis results 124 * 125 * Return: pointer to analysis results structure which is stored in internal 126 * packet area. 127 * 128 */ 129 eth_l4_hdr_info *net_rx_pkt_get_l4_info(struct NetRxPkt *pkt); 130 131 typedef enum { 132 NetPktRssIpV4, 133 NetPktRssIpV4Tcp, 134 NetPktRssIpV6Tcp, 135 NetPktRssIpV6, 136 NetPktRssIpV6Ex, 137 NetPktRssIpV6TcpEx, 138 NetPktRssIpV4Udp, 139 NetPktRssIpV6Udp, 140 NetPktRssIpV6UdpEx, 141 } NetRxPktRssType; 142 143 /** 144 * calculates RSS hash for packet 145 * 146 * @pkt: packet 147 * @type: RSS hash type 148 * 149 * Return: Toeplitz RSS hash. 150 * 151 */ 152 uint32_t 153 net_rx_pkt_calc_rss_hash(struct NetRxPkt *pkt, 154 NetRxPktRssType type, 155 uint8_t *key); 156 157 /** 158 * fetches IP identification for the packet 159 * 160 * @pkt: packet 161 * 162 */ 163 uint16_t net_rx_pkt_get_ip_id(struct NetRxPkt *pkt); 164 165 /** 166 * check if given packet is a TCP ACK packet 167 * 168 * @pkt: packet 169 * 170 */ 171 bool net_rx_pkt_is_tcp_ack(struct NetRxPkt *pkt); 172 173 /** 174 * check if given packet contains TCP data 175 * 176 * @pkt: packet 177 * 178 */ 179 bool net_rx_pkt_has_tcp_data(struct NetRxPkt *pkt); 180 181 /** 182 * returns virtio header stored in rx context 183 * 184 * @pkt: packet 185 * @ret: virtio header 186 * 187 */ 188 struct virtio_net_hdr *net_rx_pkt_get_vhdr(struct NetRxPkt *pkt); 189 190 /** 191 * returns packet type 192 * 193 * @pkt: packet 194 * @ret: packet type 195 * 196 */ 197 eth_pkt_types_e net_rx_pkt_get_packet_type(struct NetRxPkt *pkt); 198 199 /** 200 * returns vlan tag 201 * 202 * @pkt: packet 203 * @ret: VLAN tag 204 * 205 */ 206 uint16_t net_rx_pkt_get_vlan_tag(struct NetRxPkt *pkt); 207 208 /** 209 * tells whether vlan was stripped from the packet 210 * 211 * @pkt: packet 212 * @ret: VLAN stripped sign 213 * 214 */ 215 bool net_rx_pkt_is_vlan_stripped(struct NetRxPkt *pkt); 216 217 /** 218 * notifies caller if the packet has virtio header 219 * 220 * @pkt: packet 221 * @ret: true if packet has virtio header, false otherwize 222 * 223 */ 224 bool net_rx_pkt_has_virt_hdr(struct NetRxPkt *pkt); 225 226 /** 227 * attach scatter-gather data to rx packet 228 * 229 * @pkt: packet 230 * @iov: received data scatter-gather list 231 * @iovcnt number of elements in iov 232 * @iovoff data start offset in the iov 233 * @strip_vlan: should the module strip vlan from data 234 * 235 */ 236 void net_rx_pkt_attach_iovec(struct NetRxPkt *pkt, 237 const struct iovec *iov, 238 int iovcnt, size_t iovoff, 239 bool strip_vlan); 240 241 /** 242 * attach scatter-gather data to rx packet 243 * 244 * @pkt: packet 245 * @iov: received data scatter-gather list 246 * @iovcnt number of elements in iov 247 * @iovoff data start offset in the iov 248 * @strip_vlan: should the module strip vlan from data 249 * @vet: VLAN tag Ethernet type 250 * 251 */ 252 void net_rx_pkt_attach_iovec_ex(struct NetRxPkt *pkt, 253 const struct iovec *iov, int iovcnt, 254 size_t iovoff, bool strip_vlan, 255 uint16_t vet); 256 257 /** 258 * attach data to rx packet 259 * 260 * @pkt: packet 261 * @data: pointer to the data buffer 262 * @len: data length 263 * @strip_vlan: should the module strip vlan from data 264 * 265 */ 266 static inline void 267 net_rx_pkt_attach_data(struct NetRxPkt *pkt, const void *data, 268 size_t len, bool strip_vlan) 269 { 270 const struct iovec iov = { 271 .iov_base = (void *) data, 272 .iov_len = len 273 }; 274 275 net_rx_pkt_attach_iovec(pkt, &iov, 1, 0, strip_vlan); 276 } 277 278 /** 279 * returns io vector that holds the attached data 280 * 281 * @pkt: packet 282 * @ret: pointer to IOVec 283 * 284 */ 285 struct iovec *net_rx_pkt_get_iovec(struct NetRxPkt *pkt); 286 287 /** 288 * returns io vector length that holds the attached data 289 * 290 * @pkt: packet 291 * @ret: IOVec length 292 * 293 */ 294 uint16_t net_rx_pkt_get_iovec_len(struct NetRxPkt *pkt); 295 296 /** 297 * prints rx packet data if debug is enabled 298 * 299 * @pkt: packet 300 * 301 */ 302 void net_rx_pkt_dump(struct NetRxPkt *pkt); 303 304 /** 305 * copy passed vhdr data to packet context 306 * 307 * @pkt: packet 308 * @vhdr: VHDR buffer 309 * 310 */ 311 void net_rx_pkt_set_vhdr(struct NetRxPkt *pkt, 312 struct virtio_net_hdr *vhdr); 313 314 /** 315 * copy passed vhdr data to packet context 316 * 317 * @pkt: packet 318 * @iov: VHDR iov 319 * @iovcnt: VHDR iov array size 320 * 321 */ 322 void net_rx_pkt_set_vhdr_iovec(struct NetRxPkt *pkt, 323 const struct iovec *iov, int iovcnt); 324 325 /** 326 * save packet type in packet context 327 * 328 * @pkt: packet 329 * @packet_type: the packet type 330 * 331 */ 332 void net_rx_pkt_set_packet_type(struct NetRxPkt *pkt, 333 eth_pkt_types_e packet_type); 334 335 /** 336 * validate TCP/UDP checksum of the packet 337 * 338 * @pkt: packet 339 * @csum_valid: checksum validation result 340 * @ret: true if validation was performed, false in case packet is 341 * not TCP/UDP or checksum validation is not possible 342 * 343 */ 344 bool net_rx_pkt_validate_l4_csum(struct NetRxPkt *pkt, bool *csum_valid); 345 346 /** 347 * validate IPv4 checksum of the packet 348 * 349 * @pkt: packet 350 * @csum_valid: checksum validation result 351 * @ret: true if validation was performed, false in case packet is 352 * not TCP/UDP or checksum validation is not possible 353 * 354 */ 355 bool net_rx_pkt_validate_l3_csum(struct NetRxPkt *pkt, bool *csum_valid); 356 357 /** 358 * fix IPv4 checksum of the packet 359 * 360 * @pkt: packet 361 * @ret: true if checksum was fixed, false in case packet is 362 * not TCP/UDP or checksum correction is not possible 363 * 364 */ 365 bool net_rx_pkt_fix_l4_csum(struct NetRxPkt *pkt); 366 367 #endif 368