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