summaryrefslogtreecommitdiffstats
path: root/qemu/hw/net/vmxnet_rx_pkt.c
blob: aa5462931e5f0a97a75c66d73212115d06a6810a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
/*
 * QEMU VMWARE VMXNET* paravirtual NICs - RX packets abstractions
 *
 * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
 *
 * Developed by Daynix Computing LTD (http://www.daynix.com)
 *
 * Authors:
 * Dmitry Fleytman <dmitry@daynix.com>
 * Tamir Shomer <tamirs@daynix.com>
 * Yan Vugenfirer <yan@daynix.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "vmxnet_rx_pkt.h"
#include "net/eth.h"
#include "qemu-common.h"
#include "qemu/iov.h"
#include "net/checksum.h"
#include "net/tap.h"

/*
 * RX packet may contain up to 2 fragments - rebuilt eth header
 * in case of VLAN tag stripping
 * and payload received from QEMU - in any case
 */
#define VMXNET_MAX_RX_PACKET_FRAGMENTS (2)

struct VmxnetRxPkt {
    struct virtio_net_hdr virt_hdr;
    uint8_t ehdr_buf[ETH_MAX_L2_HDR_LEN];
    struct iovec vec[VMXNET_MAX_RX_PACKET_FRAGMENTS];
    uint16_t vec_len;
    uint32_t tot_len;
    uint16_t tci;
    bool vlan_stripped;
    bool has_virt_hdr;
    eth_pkt_types_e packet_type;

    /* Analysis results */
    bool isip4;
    bool isip6;
    bool isudp;
    bool istcp;
};

void vmxnet_rx_pkt_init(struct VmxnetRxPkt **pkt, bool has_virt_hdr)
{
    struct VmxnetRxPkt *p = g_malloc0(sizeof *p);
    p->has_virt_hdr = has_virt_hdr;
    *pkt = p;
}

void vmxnet_rx_pkt_uninit(struct VmxnetRxPkt *pkt)
{
    g_free(pkt);
}

struct virtio_net_hdr *vmxnet_rx_pkt_get_vhdr(struct VmxnetRxPkt *pkt)
{
    assert(pkt);
    return &pkt->virt_hdr;
}

void vmxnet_rx_pkt_attach_data(struct VmxnetRxPkt *pkt, const void *data,
                               size_t len, bool strip_vlan)
{
    uint16_t tci = 0;
    uint16_t ploff;
    assert(pkt);
    pkt->vlan_stripped = false;

    if (strip_vlan) {
        pkt->vlan_stripped = eth_strip_vlan(data, pkt->ehdr_buf, &ploff, &tci);
    }

    if (pkt->vlan_stripped) {
        pkt->vec[0].iov_base = pkt->ehdr_buf;
        pkt->vec[0].iov_len = ploff - sizeof(struct vlan_header);
        pkt->vec[1].iov_base = (uint8_t *) data + ploff;
        pkt->vec[1].iov_len = len - ploff;
        pkt->vec_len = 2;
        pkt->tot_len = len - ploff + sizeof(struct eth_header);
    } else {
        pkt->vec[0].iov_base = (void *)data;
        pkt->vec[0].iov_len = len;
        pkt->vec_len = 1;
        pkt->tot_len = len;
    }

    pkt->tci = tci;
}

void vmxnet_rx_pkt_dump(struct VmxnetRxPkt *pkt)
{
#ifdef VMXNET_RX_PKT_DEBUG
    VmxnetRxPkt *pkt = (VmxnetRxPkt *)pkt;
    assert(pkt);

    printf("RX PKT: tot_len: %d, vlan_stripped: %d, vlan_tag: %d\n",
              pkt->tot_len, pkt->vlan_stripped, pkt->tci);
#endif
}

void vmxnet_rx_pkt_set_packet_type(struct VmxnetRxPkt *pkt,
    eth_pkt_types_e packet_type)
{
    assert(pkt);

    pkt->packet_type = packet_type;

}

eth_pkt_types_e vmxnet_rx_pkt_get_packet_type(struct VmxnetRxPkt *pkt)
{
    assert(pkt);

    return pkt->packet_type;
}

size_t vmxnet_rx_pkt_get_total_len(struct VmxnetRxPkt *pkt)
{
    assert(pkt);

    return pkt->tot_len;
}

void vmxnet_rx_pkt_set_protocols(struct VmxnetRxPkt *pkt, const void *data,
                                 size_t len)
{
    assert(pkt);

    eth_get_protocols(data, len, &pkt->isip4, &pkt->isip6,
        &pkt->isudp, &pkt->istcp);
}

void vmxnet_rx_pkt_get_protocols(struct VmxnetRxPkt *pkt,
                                 bool *isip4, bool *isip6,
                                 bool *isudp, bool *istcp)
{
    assert(pkt);

    *isip4 = pkt->isip4;
    *isip6 = pkt->isip6;
    *isudp = pkt->isudp;
    *istcp = pkt->istcp;
}

struct iovec *vmxnet_rx_pkt_get_iovec(struct VmxnetRxPkt *pkt)
{
    assert(pkt);

    return pkt->vec;
}

void vmxnet_rx_pkt_set_vhdr(struct VmxnetRxPkt *pkt,
                            struct virtio_net_hdr *vhdr)
{
    assert(pkt);

    memcpy(&pkt->virt_hdr, vhdr, sizeof pkt->virt_hdr);
}

bool vmxnet_rx_pkt_is_vlan_stripped(struct VmxnetRxPkt *pkt)
{
    assert(pkt);

    return pkt->vlan_stripped;
}

bool vmxnet_rx_pkt_has_virt_hdr(struct VmxnetRxPkt *pkt)
{
    assert(pkt);

    return pkt->has_virt_hdr;
}

uint16_t vmxnet_rx_pkt_get_vlan_tag(struct VmxnetRxPkt *pkt)
{
    assert(pkt);

    return pkt->tci;
}