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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// SPDX-License-Identifier: GPL-2.0-or-later
#include <unistd.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <stdint.h>
#include <stddef.h>
#include <sys/uio.h>
#include <linux/virtio_net.h>
#include "checksum.h"
#include "util.h"
#include "ip.h"
#include "passt.h"
#include "pcap.h"
#include "log.h"
#include "vhost_user.h"
#include "udp_internal.h"
#include "udp_vu.h"
/* vhost-user */
static const struct virtio_net_hdr vu_header = {
.flags = VIRTIO_NET_HDR_F_DATA_VALID,
.gso_type = VIRTIO_NET_HDR_GSO_NONE,
};
static unsigned char buffer[65536];
static struct iovec iov_vu [VIRTQUEUE_MAX_SIZE];
static unsigned int indexes [VIRTQUEUE_MAX_SIZE];
void udp_vu_sock_handler(const struct ctx *c, union epoll_ref ref, uint32_t events,
const struct timespec *now)
{
VuDev *vdev = (VuDev *)&c->vdev;
VuVirtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE];
size_t l2_hdrlen, vnet_hdrlen, fillsize;
ssize_t data_len;
in_port_t dstport = ref.udp.port;
bool has_mrg_rxbuf, v6 = ref.udp.v6;
struct msghdr msg;
int i, iov_count, iov_used, virtqueue_max;
if (c->no_udp || !(events & EPOLLIN))
return;
has_mrg_rxbuf = vu_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF);
if (has_mrg_rxbuf) {
vnet_hdrlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
virtqueue_max = VIRTQUEUE_MAX_SIZE;
} else {
vnet_hdrlen = sizeof(struct virtio_net_hdr);
virtqueue_max = 1;
}
l2_hdrlen = vnet_hdrlen + sizeof(struct ethhdr) + sizeof(struct udphdr);
if (v6) {
l2_hdrlen += sizeof(struct ipv6hdr);
udp6_localname.sin6_port = htons(dstport);
msg.msg_name = &udp6_localname;
msg.msg_namelen = sizeof(udp6_localname);
} else {
l2_hdrlen += sizeof(struct iphdr);
udp4_localname.sin_port = htons(dstport);
msg.msg_name = &udp4_localname;
msg.msg_namelen = sizeof(udp4_localname);
}
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
for (i = 0; i < UDP_MAX_FRAMES; i++) {
struct virtio_net_hdr_mrg_rxbuf *vh;
struct ethhdr *eh;
char *base;
size_t size;
fillsize = USHRT_MAX;
iov_count = 0;
while (fillsize && iov_count < virtqueue_max) {
VuVirtqElement *elem;
elem = vu_queue_pop(vdev, vq, sizeof(VuVirtqElement), buffer);
if (!elem)
break;
if (elem->in_num < 1) {
err("virtio-net receive queue contains no in buffers");
vu_queue_rewind(vdev, vq, iov_count);
return;
}
ASSERT(elem->in_num == 1);
ASSERT(elem->in_sg[0].iov_len >= l2_hdrlen);
indexes[iov_count] = elem->index;
if (iov_count == 0) {
iov_vu[0].iov_base = (char *)elem->in_sg[0].iov_base + l2_hdrlen;
iov_vu[0].iov_len = elem->in_sg[0].iov_len - l2_hdrlen;
} else {
iov_vu[iov_count].iov_base = elem->in_sg[0].iov_base;
iov_vu[iov_count].iov_len = elem->in_sg[0].iov_len;
}
if (iov_vu[iov_count].iov_len > fillsize)
iov_vu[iov_count].iov_len = fillsize;
fillsize -= iov_vu[iov_count].iov_len;
iov_count++;
}
if (iov_count == 0)
break;
msg.msg_iov = iov_vu;
msg.msg_iovlen = iov_count;
data_len = recvmsg(ref.fd, &msg, 0);
if (data_len < 0) {
vu_queue_rewind(vdev, vq, iov_count);
return;
}
iov_used = 0;
size = data_len;
while (size) {
if (iov_vu[iov_used].iov_len > size)
iov_vu[iov_used].iov_len = size;
size -= iov_vu[iov_used].iov_len;
iov_used++;
}
base = (char *)iov_vu[0].iov_base - l2_hdrlen;
size = iov_vu[0].iov_len + l2_hdrlen;
/* release unused buffers */
vu_queue_rewind(vdev, vq, iov_count - iov_used);
/* vnet_header */
vh = (struct virtio_net_hdr_mrg_rxbuf *)base;
vh->hdr = vu_header;
if (has_mrg_rxbuf)
vh->num_buffers = htole16(iov_used);
/* ethernet header */
eh = (struct ethhdr *)(base + vnet_hdrlen);
memcpy(eh->h_dest, c->mac_guest, sizeof(eh->h_dest));
memcpy(eh->h_source, c->mac, sizeof(eh->h_source));
/* initialize header */
if (v6) {
struct ipv6hdr *ip6h = (struct ipv6hdr *)(eh + 1);
struct udphdr *uh = (struct udphdr *)(ip6h + 1);
uint32_t sum;
eh->h_proto = htons(ETH_P_IPV6);
*ip6h = (struct ipv6hdr)L2_BUF_IP6_INIT(IPPROTO_UDP);
udp_update_hdr6(c, ip6h, data_len, &udp6_localname,
dstport, now);
if (*c->pcap) {
sum = proto_ipv6_header_psum(ip6h->payload_len,
IPPROTO_UDP,
&ip6h->saddr,
&ip6h->daddr);
iov_vu[0].iov_base = uh;
iov_vu[0].iov_len = size - l2_hdrlen + sizeof(*uh);
uh->check = csum_iov(iov_vu, iov_used, sum);
}
} else {
struct iphdr *iph = (struct iphdr *)(eh + 1);
struct udphdr *uh = (struct udphdr *)(iph + 1);
uint32_t sum;
eh->h_proto = htons(ETH_P_IP);
*iph = (struct iphdr)L2_BUF_IP4_INIT(IPPROTO_UDP);
udp_update_hdr4(c, iph, data_len, &udp4_localname,
dstport, now);
if (*c->pcap) {
sum = proto_ipv4_header_psum(iph->tot_len,
IPPROTO_UDP,
(struct in_addr){ .s_addr = iph->saddr },
(struct in_addr){ .s_addr = iph->daddr });
iov_vu[0].iov_base = uh;
iov_vu[0].iov_len = size - l2_hdrlen + sizeof(*uh);
uh->check = csum_iov(iov_vu, iov_used, sum);
}
}
/* set iov for pcap logging */
iov_vu[0].iov_base = base + vnet_hdrlen;
iov_vu[0].iov_len = size - vnet_hdrlen;
pcap_iov(iov_vu, iov_used);
/* set iov_len for vu_queue_fill_by_index(); */
iov_vu[0].iov_base = base;
iov_vu[0].iov_len = size;
/* send packets */
for (i = 0; i < iov_used; i++)
vu_queue_fill_by_index(vdev, vq, indexes[i],
iov_vu[i].iov_len, i);
vu_queue_flush(vdev, vq, iov_used);
vu_queue_notify(vdev, vq);
}
}
|
