hw/net/vmxnet_rx_pkt.c

   1 /*
   2  * QEMU VMWARE VMXNET* paravirtual NICs - RX packets abstractions
   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 #include "qemu/osdep.h"
  19 #include "vmxnet_rx_pkt.h"
  20 #include "net/eth.h"
  21 #include "qemu-common.h"
  22 #include "qemu/iov.h"
  23 #include "net/checksum.h"
  24 #include "net/tap.h"
  25
  26 /*
  27  * RX packet may contain up to 2 fragments - rebuilt eth header
  28  * in case of VLAN tag stripping
  29  * and payload received from QEMU - in any case
  30  */
  31 #define VMXNET_MAX_RX_PACKET_FRAGMENTS (2)
  32
  33 struct VmxnetRxPkt {
  34     struct virtio_net_hdr virt_hdr;
  35     uint8_t ehdr_buf[ETH_MAX_L2_HDR_LEN];
  36     struct iovec vec[VMXNET_MAX_RX_PACKET_FRAGMENTS];
  37     uint16_t vec_len;
  38     uint32_t tot_len;
  39     uint16_t tci;
  40     bool vlan_stripped;
  41     bool has_virt_hdr;
  42     eth_pkt_types_e packet_type;
  43
  44     /* Analysis results */
  45     bool isip4;
  46     bool isip6;
  47     bool isudp;
  48     bool istcp;
  49 };
  50
  51 void vmxnet_rx_pkt_init(struct VmxnetRxPkt **pkt, bool has_virt_hdr)
  52 {
  53     struct VmxnetRxPkt *p = g_malloc0(sizeof *p);
  54     p->has_virt_hdr = has_virt_hdr;
  55     *pkt = p;
  56 }
  57
  58 void vmxnet_rx_pkt_uninit(struct VmxnetRxPkt *pkt)
  59 {
  60     g_free(pkt);
  61 }
  62
  63 struct virtio_net_hdr *vmxnet_rx_pkt_get_vhdr(struct VmxnetRxPkt *pkt)
  64 {
  65     assert(pkt);
  66     return &pkt->virt_hdr;
  67 }
  68
  69 void vmxnet_rx_pkt_attach_data(struct VmxnetRxPkt *pkt, const void *data,
  70                                size_t len, bool strip_vlan)
  71 {
  72     uint16_t tci = 0;
  73     uint16_t ploff;
  74     assert(pkt);
  75     pkt->vlan_stripped = false;
  76
  77     if (strip_vlan) {
  78         pkt->vlan_stripped = eth_strip_vlan(data, pkt->ehdr_buf, &ploff, &tci);
  79     }
  80
  81     if (pkt->vlan_stripped) {
  82         pkt->vec[0].iov_base = pkt->ehdr_buf;
  83         pkt->vec[0].iov_len = ploff - sizeof(struct vlan_header);
  84         pkt->vec[1].iov_base = (uint8_t *) data + ploff;
  85         pkt->vec[1].iov_len = len - ploff;
  86         pkt->vec_len = 2;
  87         pkt->tot_len = len - ploff + sizeof(struct eth_header);
  88     } else {
  89         pkt->vec[0].iov_base = (void *)data;
  90         pkt->vec[0].iov_len = len;
  91         pkt->vec_len = 1;
  92         pkt->tot_len = len;
  93     }
  94
  95     pkt->tci = tci;
  96 }
  97
  98 void vmxnet_rx_pkt_dump(struct VmxnetRxPkt *pkt)
  99 {
 100 #ifdef VMXNET_RX_PKT_DEBUG
 101     VmxnetRxPkt *pkt = (VmxnetRxPkt *)pkt;
 102     assert(pkt);
 103
 104     printf("RX PKT: tot_len: %d, vlan_stripped: %d, vlan_tag: %d\n",
 105               pkt->tot_len, pkt->vlan_stripped, pkt->tci);
 106 #endif
 107 }
 108
 109 void vmxnet_rx_pkt_set_packet_type(struct VmxnetRxPkt *pkt,
 110     eth_pkt_types_e packet_type)
 111 {
 112     assert(pkt);
 113
 114     pkt->packet_type = packet_type;
 115
 116 }
 117
 118 eth_pkt_types_e vmxnet_rx_pkt_get_packet_type(struct VmxnetRxPkt *pkt)
 119 {
 120     assert(pkt);
 121
 122     return pkt->packet_type;
 123 }
 124
 125 size_t vmxnet_rx_pkt_get_total_len(struct VmxnetRxPkt *pkt)
 126 {
 127     assert(pkt);
 128
 129     return pkt->tot_len;
 130 }
 131
 132 void vmxnet_rx_pkt_set_protocols(struct VmxnetRxPkt *pkt, const void *data,
 133                                  size_t len)
 134 {
 135     assert(pkt);
 136
 137     eth_get_protocols(data, len, &pkt->isip4, &pkt->isip6,
 138         &pkt->isudp, &pkt->istcp);
 139 }
 140
 141 void vmxnet_rx_pkt_get_protocols(struct VmxnetRxPkt *pkt,
 142                                  bool *isip4, bool *isip6,
 143                                  bool *isudp, bool *istcp)
 144 {
 145     assert(pkt);
 146
 147     *isip4 = pkt->isip4;
 148     *isip6 = pkt->isip6;
 149     *isudp = pkt->isudp;
 150     *istcp = pkt->istcp;
 151 }
 152
 153 struct iovec *vmxnet_rx_pkt_get_iovec(struct VmxnetRxPkt *pkt)
 154 {
 155     assert(pkt);
 156
 157     return pkt->vec;
 158 }
 159
 160 void vmxnet_rx_pkt_set_vhdr(struct VmxnetRxPkt *pkt,
 161                             struct virtio_net_hdr *vhdr)
 162 {
 163     assert(pkt);
 164
 165     memcpy(&pkt->virt_hdr, vhdr, sizeof pkt->virt_hdr);
 166 }
 167
 168 bool vmxnet_rx_pkt_is_vlan_stripped(struct VmxnetRxPkt *pkt)
 169 {
 170     assert(pkt);
 171
 172     return pkt->vlan_stripped;
 173 }
 174
 175 bool vmxnet_rx_pkt_has_virt_hdr(struct VmxnetRxPkt *pkt)
 176 {
 177     assert(pkt);
 178
 179     return pkt->has_virt_hdr;
 180 }
 181
 182 uint16_t vmxnet_rx_pkt_get_vlan_tag(struct VmxnetRxPkt *pkt)
 183 {
 184     assert(pkt);
 185
 186     return pkt->tci;
 187 }