| /* |
| * Copyright (C) 2017 - Cambridge Greys Limited |
| * Copyright (C) 2011 - 2014 Cisco Systems Inc |
| * Licensed under the GPL. |
| */ |
| |
| #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_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; |
| } |
| |
