460 lines
11 KiB
C
460 lines
11 KiB
C
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/*
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* Copyright (C) 2017 - Cambridge Greys Limited
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* Copyright (C) 2011 - 2014 Cisco Systems Inc
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* Licensed under the GPL.
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*/
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#include <linux/etherdevice.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <asm/byteorder.h>
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#include <uapi/linux/ip.h>
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#include <uapi/linux/virtio_net.h>
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#include <linux/virtio_net.h>
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#include <linux/virtio_byteorder.h>
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#include <linux/netdev_features.h>
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#include "vector_user.h"
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#include "vector_kern.h"
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#define GOOD_LINEAR 512
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#define GSO_ERROR "Incoming GSO frames and GRO disabled on the interface"
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struct gre_minimal_header {
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uint16_t header;
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uint16_t arptype;
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};
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struct uml_gre_data {
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uint32_t rx_key;
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uint32_t tx_key;
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uint32_t sequence;
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bool ipv6;
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bool has_sequence;
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bool pin_sequence;
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bool checksum;
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bool key;
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struct gre_minimal_header expected_header;
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uint32_t checksum_offset;
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uint32_t key_offset;
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uint32_t sequence_offset;
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};
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struct uml_l2tpv3_data {
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uint64_t rx_cookie;
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uint64_t tx_cookie;
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uint64_t rx_session;
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uint64_t tx_session;
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uint32_t counter;
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bool udp;
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bool ipv6;
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bool has_counter;
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bool pin_counter;
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bool cookie;
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bool cookie_is_64;
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uint32_t cookie_offset;
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uint32_t session_offset;
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uint32_t counter_offset;
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};
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static int l2tpv3_form_header(uint8_t *header,
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struct sk_buff *skb, struct vector_private *vp)
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{
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struct uml_l2tpv3_data *td = vp->transport_data;
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uint32_t *counter;
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if (td->udp)
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*(uint32_t *) header = cpu_to_be32(L2TPV3_DATA_PACKET);
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(*(uint32_t *) (header + td->session_offset)) = td->tx_session;
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if (td->cookie) {
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if (td->cookie_is_64)
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(*(uint64_t *)(header + td->cookie_offset)) =
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td->tx_cookie;
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else
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(*(uint32_t *)(header + td->cookie_offset)) =
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td->tx_cookie;
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}
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if (td->has_counter) {
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counter = (uint32_t *)(header + td->counter_offset);
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if (td->pin_counter) {
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*counter = 0;
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} else {
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td->counter++;
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*counter = cpu_to_be32(td->counter);
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}
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}
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return 0;
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}
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static int gre_form_header(uint8_t *header,
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struct sk_buff *skb, struct vector_private *vp)
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{
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struct uml_gre_data *td = vp->transport_data;
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uint32_t *sequence;
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*((uint32_t *) header) = *((uint32_t *) &td->expected_header);
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if (td->key)
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(*(uint32_t *) (header + td->key_offset)) = td->tx_key;
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if (td->has_sequence) {
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sequence = (uint32_t *)(header + td->sequence_offset);
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if (td->pin_sequence)
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*sequence = 0;
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else
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*sequence = cpu_to_be32(++td->sequence);
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}
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return 0;
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}
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static int raw_form_header(uint8_t *header,
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struct sk_buff *skb, struct vector_private *vp)
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{
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struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
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virtio_net_hdr_from_skb(
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skb,
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vheader,
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virtio_legacy_is_little_endian(),
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false,
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0
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);
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return 0;
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}
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static int l2tpv3_verify_header(
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uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
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{
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struct uml_l2tpv3_data *td = vp->transport_data;
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uint32_t *session;
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uint64_t cookie;
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if ((!td->udp) && (!td->ipv6))
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header += sizeof(struct iphdr) /* fix for ipv4 raw */;
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/* we do not do a strict check for "data" packets as per
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* the RFC spec because the pure IP spec does not have
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* that anyway.
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*/
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if (td->cookie) {
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if (td->cookie_is_64)
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cookie = *(uint64_t *)(header + td->cookie_offset);
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else
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cookie = *(uint32_t *)(header + td->cookie_offset);
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if (cookie != td->rx_cookie) {
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if (net_ratelimit())
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netdev_err(vp->dev, "uml_l2tpv3: unknown cookie id");
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return -1;
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}
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}
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session = (uint32_t *) (header + td->session_offset);
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if (*session != td->rx_session) {
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if (net_ratelimit())
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netdev_err(vp->dev, "uml_l2tpv3: session mismatch");
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return -1;
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}
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return 0;
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}
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static int gre_verify_header(
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uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
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{
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uint32_t key;
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struct uml_gre_data *td = vp->transport_data;
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if (!td->ipv6)
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header += sizeof(struct iphdr) /* fix for ipv4 raw */;
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if (*((uint32_t *) header) != *((uint32_t *) &td->expected_header)) {
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if (net_ratelimit())
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netdev_err(vp->dev, "header type disagreement, expecting %0x, got %0x",
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*((uint32_t *) &td->expected_header),
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*((uint32_t *) header)
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);
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return -1;
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}
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if (td->key) {
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key = (*(uint32_t *)(header + td->key_offset));
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if (key != td->rx_key) {
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if (net_ratelimit())
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netdev_err(vp->dev, "unknown key id %0x, expecting %0x",
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key, td->rx_key);
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return -1;
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}
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}
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return 0;
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}
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static int raw_verify_header(
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uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
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{
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struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
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if ((vheader->gso_type != VIRTIO_NET_HDR_GSO_NONE) &&
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(vp->req_size != 65536)) {
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if (net_ratelimit())
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netdev_err(
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vp->dev,
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GSO_ERROR
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);
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}
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if ((vheader->flags & VIRTIO_NET_HDR_F_DATA_VALID) > 0)
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return 1;
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virtio_net_hdr_to_skb(skb, vheader, virtio_legacy_is_little_endian());
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return 0;
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}
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static bool get_uint_param(
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struct arglist *def, char *param, unsigned int *result)
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{
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char *arg = uml_vector_fetch_arg(def, param);
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if (arg != NULL) {
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if (kstrtoint(arg, 0, result) == 0)
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return true;
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}
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return false;
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}
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static bool get_ulong_param(
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struct arglist *def, char *param, unsigned long *result)
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{
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char *arg = uml_vector_fetch_arg(def, param);
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if (arg != NULL) {
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if (kstrtoul(arg, 0, result) == 0)
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return true;
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return true;
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}
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return false;
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}
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static int build_gre_transport_data(struct vector_private *vp)
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{
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struct uml_gre_data *td;
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int temp_int;
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int temp_rx;
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int temp_tx;
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vp->transport_data = kmalloc(sizeof(struct uml_gre_data), GFP_KERNEL);
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if (vp->transport_data == NULL)
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return -ENOMEM;
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td = vp->transport_data;
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td->sequence = 0;
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td->expected_header.arptype = GRE_IRB;
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td->expected_header.header = 0;
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vp->form_header = &gre_form_header;
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vp->verify_header = &gre_verify_header;
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vp->header_size = 4;
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td->key_offset = 4;
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td->sequence_offset = 4;
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td->checksum_offset = 4;
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td->ipv6 = false;
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if (get_uint_param(vp->parsed, "v6", &temp_int)) {
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if (temp_int > 0)
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td->ipv6 = true;
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}
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td->key = false;
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if (get_uint_param(vp->parsed, "rx_key", &temp_rx)) {
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if (get_uint_param(vp->parsed, "tx_key", &temp_tx)) {
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td->key = true;
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td->expected_header.header |= GRE_MODE_KEY;
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td->rx_key = cpu_to_be32(temp_rx);
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td->tx_key = cpu_to_be32(temp_tx);
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vp->header_size += 4;
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td->sequence_offset += 4;
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} else {
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return -EINVAL;
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}
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}
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td->sequence = false;
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if (get_uint_param(vp->parsed, "sequence", &temp_int)) {
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if (temp_int > 0) {
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vp->header_size += 4;
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td->has_sequence = true;
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td->expected_header.header |= GRE_MODE_SEQUENCE;
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if (get_uint_param(
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vp->parsed, "pin_sequence", &temp_int)) {
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if (temp_int > 0)
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td->pin_sequence = true;
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}
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}
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}
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vp->rx_header_size = vp->header_size;
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if (!td->ipv6)
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vp->rx_header_size += sizeof(struct iphdr);
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return 0;
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}
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static int build_l2tpv3_transport_data(struct vector_private *vp)
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{
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struct uml_l2tpv3_data *td;
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int temp_int, temp_rxs, temp_txs;
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unsigned long temp_rx;
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unsigned long temp_tx;
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vp->transport_data = kmalloc(
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sizeof(struct uml_l2tpv3_data), GFP_KERNEL);
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if (vp->transport_data == NULL)
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return -ENOMEM;
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td = vp->transport_data;
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vp->form_header = &l2tpv3_form_header;
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vp->verify_header = &l2tpv3_verify_header;
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td->counter = 0;
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vp->header_size = 4;
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td->session_offset = 0;
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td->cookie_offset = 4;
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td->counter_offset = 4;
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td->ipv6 = false;
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if (get_uint_param(vp->parsed, "v6", &temp_int)) {
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if (temp_int > 0)
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td->ipv6 = true;
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}
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if (get_uint_param(vp->parsed, "rx_session", &temp_rxs)) {
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if (get_uint_param(vp->parsed, "tx_session", &temp_txs)) {
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td->tx_session = cpu_to_be32(temp_txs);
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td->rx_session = cpu_to_be32(temp_rxs);
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} else {
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return -EINVAL;
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}
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} else {
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return -EINVAL;
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}
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td->cookie_is_64 = false;
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if (get_uint_param(vp->parsed, "cookie64", &temp_int)) {
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if (temp_int > 0)
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td->cookie_is_64 = true;
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}
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td->cookie = false;
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if (get_ulong_param(vp->parsed, "rx_cookie", &temp_rx)) {
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if (get_ulong_param(vp->parsed, "tx_cookie", &temp_tx)) {
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td->cookie = true;
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if (td->cookie_is_64) {
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td->rx_cookie = cpu_to_be64(temp_rx);
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td->tx_cookie = cpu_to_be64(temp_tx);
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vp->header_size += 8;
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td->counter_offset += 8;
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} else {
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td->rx_cookie = cpu_to_be32(temp_rx);
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td->tx_cookie = cpu_to_be32(temp_tx);
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vp->header_size += 4;
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td->counter_offset += 4;
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}
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} else {
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return -EINVAL;
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}
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}
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td->has_counter = false;
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if (get_uint_param(vp->parsed, "counter", &temp_int)) {
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if (temp_int > 0) {
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td->has_counter = true;
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vp->header_size += 4;
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if (get_uint_param(
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vp->parsed, "pin_counter", &temp_int)) {
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if (temp_int > 0)
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td->pin_counter = true;
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}
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}
|
||
|
|
}
|
||
|
|
|
||
|
|
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_tap_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: 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|