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 "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
  97 void vmxnet_rx_pkt_dump(struct VmxnetRxPkt *pkt)
  98 {
  99 #ifdef VMXNET_RX_PKT_DEBUG
 100     VmxnetRxPkt *pkt = (VmxnetRxPkt *)pkt;
 101     assert(pkt);
 102
 103     printf("RX PKT: tot_len: %d, vlan_stripped: %d, vlan_tag: %d\n",
 104               pkt->tot_len, pkt->vlan_stripped, pkt->tci);
 105 #endif
 106 }
 107
 108 void vmxnet_rx_pkt_set_packet_type(struct VmxnetRxPkt *pkt,
 109     eth_pkt_types_e packet_type)
 110 {
 111     assert(pkt);
 112
 113     pkt->packet_type = packet_type;
 114
 115 }
 116
 117 eth_pkt_types_e vmxnet_rx_pkt_get_packet_type(struct VmxnetRxPkt *pkt)
 118 {
 119     assert(pkt);
 120
 121     return pkt->packet_type;
 122 }
 123
 124 size_t vmxnet_rx_pkt_get_total_len(struct VmxnetRxPkt *pkt)
 125 {
 126     assert(pkt);
 127
 128     return pkt->tot_len;
 129 }
 130
 131 void vmxnet_rx_pkt_set_protocols(struct VmxnetRxPkt *pkt, const void *data,
 132                                  size_t len)
 133 {
 134     assert(pkt);
 135
 136     eth_get_protocols(data, len, &pkt->isip4, &pkt->isip6,
 137         &pkt->isudp, &pkt->istcp);
 138 }
 139
 140 void vmxnet_rx_pkt_get_protocols(struct VmxnetRxPkt *pkt,
 141                                  bool *isip4, bool *isip6,
 142                                  bool *isudp, bool *istcp)
 143 {
 144     assert(pkt);
 145
 146     *isip4 = pkt->isip4;
 147     *isip6 = pkt->isip6;
 148     *isudp = pkt->isudp;
 149     *istcp = pkt->istcp;
 150 }
 151
 152 struct iovec *vmxnet_rx_pkt_get_iovec(struct VmxnetRxPkt *pkt)
 153 {
 154     assert(pkt);
 155
 156     return pkt->vec;
 157 }
 158
 159 void vmxnet_rx_pkt_set_vhdr(struct VmxnetRxPkt *pkt,
 160                             struct virtio_net_hdr *vhdr)
 161 {
 162     assert(pkt);
 163
 164     memcpy(&pkt->virt_hdr, vhdr, sizeof pkt->virt_hdr);
 165 }
 166
 167 bool vmxnet_rx_pkt_is_vlan_stripped(struct VmxnetRxPkt *pkt)
 168 {
 169     assert(pkt);
 170
 171     return pkt->vlan_stripped;
 172 }
 173
 174 bool vmxnet_rx_pkt_has_virt_hdr(struct VmxnetRxPkt *pkt)
 175 {
 176     assert(pkt);
 177
 178     return pkt->has_virt_hdr;
 179 }
 180
 181 uint16_t vmxnet_rx_pkt_get_vlan_tag(struct VmxnetRxPkt *pkt)
 182 {
 183     assert(pkt);
 184
 185     return pkt->tci;
 186 }