// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2017 - Cambridge Greys Limited
* Copyright (C) 2011 - 2014 Cisco Systems Inc
*/
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <uapi/linux/ip.h>
#include <uapi/linux/virtio_net.h>
#include <linux/virtio_net.h>
#include <linux/virtio_byteorder.h>
#include <linux/netdev_features.h>
#include "vector_user.h"
#include "vector_kern.h"
#define GOOD_LINEAR 512
#define GSO_ERROR "Incoming GSO frames and GRO disabled on the interface"
struct gre_minimal_header {
uint16_t header;
uint16_t arptype;
};
struct uml_gre_data {
uint32_t rx_key;
uint32_t tx_key;
uint32_t sequence;
bool ipv6;
bool has_sequence;
bool pin_sequence;
bool checksum;
bool key;
struct gre_minimal_header expected_header;
uint32_t checksum_offset;
uint32_t key_offset;
uint32_t sequence_offset;
};
struct uml_l2tpv3_data {
uint64_t rx_cookie;
uint64_t tx_cookie;
uint64_t rx_session;
uint64_t tx_session;
uint32_t counter;
bool udp;
bool ipv6;
bool has_counter;
bool pin_counter;
bool cookie;
bool cookie_is_64;
uint32_t cookie_offset;
uint32_t session_offset;
uint32_t counter_offset;
};
static int l2tpv3_form_header(uint8_t *header,
struct sk_buff *skb, struct vector_private *vp)
{
struct uml_l2tpv3_data *td = vp->transport_data;
uint32_t *counter;
if (td->udp)
*(uint32_t *) header = cpu_to_be32(L2TPV3_DATA_PACKET);
(*(uint32_t *) (header + td->session_offset)) = td->tx_session;
if (td->cookie) {
if (td->cookie_is_64)
(*(uint64_t *)(header + td->cookie_offset)) =
td->tx_cookie;
else
(*(uint32_t *)(header + td->cookie_offset)) =
td->tx_cookie;
}
if (td->has_counter) {
counter = (uint32_t *)(header + td->counter_offset);
if (td->pin_counter) {
*counter = 0;
} else {
td->counter++;
*counter = cpu_to_be32(td->counter);
}
}
return 0;
}
static int gre_form_header(uint8_t *header,
struct sk_buff *skb, struct vector_private *vp)
{
struct uml_gre_data *td = vp->transport_data;
uint32_t *sequence;
*((uint32_t *) header) = *((uint32_t *) &td->expected_header);
if (td->key)
(*(uint32_t *) (header + td->key_offset)) = td->tx_key;
if (td->has_sequence) {
sequence = (uint32_t *)(header + td->sequence_offset);
if (td->pin_sequence)
*sequence = 0;
else
*sequence = cpu_to_be32(++td->sequence);
}
return 0;
}
static int raw_form_header(uint8_t *header,
struct sk_buff *skb, struct vector_private *vp)
{
struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
virtio_net_hdr_from_skb(
skb,
vheader,
virtio_legacy_is_little_endian(),
false,
0
);
return 0;
}
static int l2tpv3_verify_header(
uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
{
struct uml_l2tpv3_data *td = vp->transport_data;
uint32_t *session;
uint64_t cookie;
if ((!td->udp) && (!td->ipv6))
header += sizeof(struct iphdr) /* fix for ipv4 raw */;
/* we do not do a strict check for "data" packets as per
* the RFC spec because the pure IP spec does not have
* that anyway.
*/
if (td->cookie) {
if (td->cookie_is_64)
cookie = *(uint64_t *)(header + td->cookie_offset);
else
cookie = *(uint32_t *)(header + td->cookie_offset);
if (cookie != td->rx_cookie) {
if (net_ratelimit())
netdev_err(vp->dev, "uml_l2tpv3: unknown cookie id");
return -1;
}
}
session = (uint32_t *) (header + td->session_offset);
if (*session != td->rx_session) {
if (net_ratelimit())
netdev_err(vp->dev, "uml_l2tpv3: session mismatch");
return -1;
}
return 0;
}
static int gre_verify_header(
uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
{
uint32_t key;
struct uml_gre_data *td = vp->transport_data;
if (!td->ipv6)
header += sizeof(struct iphdr) /* fix for ipv4 raw */;
if (*((uint32_t *) header) != *((uint32_t *) &td->expected_header)) {
if (net_ratelimit())
netdev_err(vp->dev, "header type disagreement, expecting %0x, got %0x",
*((uint32_t *) &td->expected_header),
*((uint32_t *) header)
);
return -1;
}
if (td->key) {
key = (*(uint32_t *)(header + td->key_offset));
if (key != td->rx_key) {
if (net_ratelimit())
netdev_err(vp->dev, "unknown key id %0x, expecting %0x",
key, td->rx_key);
return -1;
}
}
return 0;
}
static int raw_verify_header(
uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
{
struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
if ((vheader->gso_type != VIRTIO_NET_HDR_GSO_NONE) &&
(vp->req_size != 65536)) {
if (net_ratelimit())
netdev_err(
vp->dev,
GSO_ERROR
);
}
if ((vheader->flags & VIRTIO_NET_HDR_F_DATA_VALID) > 0)
return 1;
virtio_net_hdr_to_skb(skb, vheader, virtio_legacy_is_little_endian());
return 0;
}
static bool get_uint_param(
struct arglist *def, char *param, unsigned int *result)
{
char *arg = uml_vector_fetch_arg(def, param);
if (arg != NULL) {
if (kstrtoint(arg, 0, result) == 0)
return true;
}
return false;
}
static bool get_ulong_param(
struct arglist *def, char *param, unsigned long *result)
{
char *arg = uml_vector_fetch_arg(def, param);
if (arg != NULL) {
if (kstrtoul(arg, 0, result) == 0)
return true;
return true;
}
return false;
}
static int build_gre_transport_data(struct vector_private *vp)
{
struct uml_gre_data *td;
int temp_int;
int temp_rx;
int temp_tx;
vp->transport_data = kmalloc(sizeof(struct uml_gre_data), GFP_KERNEL);
if (vp->transport_data == NULL)
return -ENOMEM;
td = vp->transport_data;
td->sequence = 0;
td->expected_header.arptype = GRE_IRB;
td->expected_header.header = 0;
vp->form_header = &gre_form_header;
vp->verify_header = &gre_verify_header;
vp->header_size = 4;
td->key_offset = 4;
td->sequence_offset = 4;
td->checksum_offset = 4;
td->ipv6 = false;
if (get_uint_param(vp->parsed, "v6", &temp_int)) {
if (temp_int > 0)
td->ipv6 = true;
}
td->key = false;
if (get_uint_param(vp->parsed, "rx_key", &temp_rx)) {
if (get_uint_param(vp->parsed, "tx_key", &temp_tx)) {
td->key = true;
td->expected_header.header |= GRE_MODE_KEY;
td->rx_key = cpu_to_be32(temp_rx);
td->tx_key = cpu_to_be32(temp_tx);
vp->header_size += 4;
td->sequence_offset += 4;
} else {
return -EINVAL;
}
}
td->sequence = false;
if (get_uint_param(vp->parsed, "sequence", &temp_int)) {
if (temp_int > 0) {
vp->header_size += 4;
td->has_sequence = true;
td->expected_header.header |= GRE_MODE_SEQUENCE;
if (get_uint_param(
vp->parsed, "pin_sequence", &temp_int)) {
if (temp_int > 0)
td->pin_sequence = true;
}
}
}
vp->rx_header_size = vp->header_size;
if (!td->ipv6)
vp->rx_header_size += sizeof(struct iphdr);
return 0;
}
static int build_l2tpv3_transport_data(struct vector_private *vp)
{
struct uml_l2tpv3_data *td;
int temp_int, temp_rxs, temp_txs;
unsigned long temp_rx;
unsigned long temp_tx;
vp->transport_data = kmalloc(
sizeof(struct uml_l2tpv3_data), GFP_KERNEL);
if (vp->transport_data == NULL)
return -ENOMEM;
td = vp->transport_data;
vp->form_header = &l2tpv3_form_header;
vp->verify_header = &l2tpv3_verify_header;
td->counter = 0;
vp->header_size = 4;
td->session_offset = 0;
td->cookie_offset = 4;
td->counter_offset = 4;
td->ipv6 = false;
if (get_uint_param(vp->parsed, "v6", &temp_int)) {
if (temp_int > 0)
td->ipv6 = true;
}
if (get_uint_param(vp->parsed, "rx_session", &temp_rxs)) {
if (get_uint_param(vp->parsed, "tx_session", &temp_txs)) {
td->tx_session = cpu_to_be32(temp_txs);
td->rx_session = cpu_to_be32(temp_rxs);
} else {
return -EINVAL;
}
} else {
return -EINVAL;
}
td->cookie_is_64 = false;
if (get_uint_param(vp->parsed, "cookie64", &temp_int)) {
if (temp_int > 0)
td->cookie_is_64 = true;
}
td->cookie = false;
if (get_ulong_param(vp->parsed, "rx_cookie", &temp_rx)) {
if (get_ulong_param(vp->parsed, "tx_cookie", &temp_tx)) {
td->cookie = true;
if (td->cookie_is_64) {
td->rx_cookie = cpu_to_be64(temp_rx);
td->tx_cookie = cpu_to_be64(temp_tx);
vp->header_size += 8;
td->counter_offset += 8;
} else {
td->rx_cookie = cpu_to_be32(temp_rx);
td->tx_cookie = cpu_to_be32(temp_tx);
vp->header_size += 4;
td->counter_offset += 4;
}
} else {
return -EINVAL;
}
}
td->has_counter = false;
if (get_uint_param(vp->parsed, "counter", &temp_int)) {
if (temp_int > 0) {
td->has_counter = true;
vp->header_size += 4;
if (get_uint_param(
vp->parsed, "pin_counter", &temp_int)) {
if (temp_int > 0)
td->pin_counter = true;
}
}
}
if (get_uint_param(vp->parsed, "udp", &temp_int)) {
if (temp_int > 0) {
td->udp = true;
vp->header_size += 4;
td->counter_offset += 4;
td->session_offset += 4;
td->cookie_offset += 4;
}
}
vp->rx_header_size = vp->header_size;
if ((!td->ipv6) && (!td->udp))
vp->rx_header_size += sizeof(struct iphdr);
return 0;
}
static int build_raw_transport_data(struct vector_private *vp)
{
if (uml_raw_enable_vnet_headers(vp->fds->rx_fd)) {
if (!uml_raw_enable_vnet_headers(vp->fds->tx_fd))
return -1;
vp->form_header = &raw_form_header;
vp->verify_header = &raw_verify_header;
vp->header_size = sizeof(struct virtio_net_hdr);
vp->rx_header_size = sizeof(struct virtio_net_hdr);
vp->dev->hw_features |= (NETIF_F_TSO | NETIF_F_GRO);
vp->dev->features |=
(NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
NETIF_F_TSO | NETIF_F_GRO);
netdev_info(
vp->dev,
"raw: using vnet headers for tso and tx/rx checksum"
);
}
return 0;
}
static int build_hybrid_transport_data(struct vector_private *vp)
{
if (uml_raw_enable_vnet_headers(vp->fds->rx_fd)) {
vp->form_header = &raw_form_header;
vp->verify_header = &raw_verify_header;
vp->header_size = sizeof(struct virtio_net_hdr);
vp->rx_header_size = sizeof(struct virtio_net_hdr);
vp->dev->hw_features |=
(NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
vp->dev->features |=
(NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
netdev_info(
vp->dev,
"tap/raw hybrid: using vnet headers for tso and tx/rx checksum"
);
} else {
return 0; /* do not try to enable tap too if raw failed */
}
if (uml_tap_enable_vnet_headers(vp->fds->tx_fd))
return 0;
return -1;
}
static int build_tap_transport_data(struct vector_private *vp)
{
/* "Pure" tap uses the same fd for rx and tx */
if (uml_tap_enable_vnet_headers(vp->fds->tx_fd)) {
vp->form_header = &raw_form_header;
vp->verify_header = &raw_verify_header;
vp->header_size = sizeof(struct virtio_net_hdr);
vp->rx_header_size = sizeof(struct virtio_net_hdr);
vp->dev->hw_features |=
(NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
vp->dev->features |=
(NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
netdev_info(
vp->dev,
"tap: using vnet headers for tso and tx/rx checksum"
);
return 0;
}
return -1;
}
static int build_bess_transport_data(struct vector_private *vp)
{
vp->form_header = NULL;
vp->verify_header = NULL;
vp->header_size = 0;
vp->rx_header_size = 0;
return 0;
}
int build_transport_data(struct vector_private *vp)
{
char *transport = uml_vector_fetch_arg(vp->parsed, "transport");
if (strncmp(transport, TRANS_GRE, TRANS_GRE_LEN) == 0)
return build_gre_transport_data(vp);
if (strncmp(transport, TRANS_L2TPV3, TRANS_L2TPV3_LEN) == 0)
return build_l2tpv3_transport_data(vp);
if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
return build_raw_transport_data(vp);
if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
return build_tap_transport_data(vp);
if (strncmp(transport, TRANS_HYBRID, TRANS_HYBRID_LEN) == 0)
return build_hybrid_transport_data(vp);
if (strncmp(transport, TRANS_BESS, TRANS_BESS_LEN) == 0)
return build_bess_transport_data(vp);
return 0;
}
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