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| | // 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_checksum(ip6h, IPPROTO_UDP);
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 {
/* 0 checksum is invalid with IPv6/UDP */
uh->check = 0xFFFF;
}
} 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_checksum(iph, IPPROTO_UDP);
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);
}
}
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