From b6503ed9b8815ecfb82fe9faba28936365321248 Mon Sep 17 00:00:00 2001 From: aliguori Date: Thu, 5 Feb 2009 22:36:28 +0000 Subject: [PATCH] qemu:virtio-net: Add additional MACs via a filter table (Alex Williamson) Create a filter table and allow the guest to populate it with the MAC class control commands. We manage the size and usage of the filter table including enabling promiscuous and all-multi modes as necessary. The guest should therefore assume the table is infinite. Eventually this might allow us to bind directly to a hardware NIC and manipulate a physical MAC filter. The specifics of the TABLE_SET command are documented in virtio-net.h. Separate buffers in the same command are used for unicaste and multicast addresses for priority and sychronization. With this we can export the VIRTIO_NET_F_CTRL_RX feature bit. Signed-off-by: Alex Williamson Signed-off-by: Anthony Liguori git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6539 c046a42c-6fe2-441c-8c8c-71466251a162 --- hw/virtio-net.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++-- hw/virtio-net.h | 22 ++++++++++++ 2 files changed, 109 insertions(+), 2 deletions(-) diff --git a/hw/virtio-net.c b/hw/virtio-net.c index 001169d7a2..524ef37134 100644 --- a/hw/virtio-net.c +++ b/hw/virtio-net.c @@ -16,7 +16,9 @@ #include "qemu-timer.h" #include "virtio-net.h" -#define VIRTIO_NET_VM_VERSION 4 +#define VIRTIO_NET_VM_VERSION 5 + +#define MAC_TABLE_ENTRIES 32 typedef struct VirtIONet { @@ -32,6 +34,10 @@ typedef struct VirtIONet int mergeable_rx_bufs; int promisc; int allmulti; + struct { + int in_use; + uint8_t *macs; + } mac_table; } VirtIONet; /* TODO @@ -87,13 +93,18 @@ static void virtio_net_reset(VirtIODevice *vdev) /* Reset back to compatibility mode */ n->promisc = 1; n->allmulti = 0; + + /* Flush any MAC filter table state */ + n->mac_table.in_use = 0; + memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); } static uint32_t virtio_net_get_features(VirtIODevice *vdev) { uint32_t features = (1 << VIRTIO_NET_F_MAC) | (1 << VIRTIO_NET_F_STATUS) | - (1 << VIRTIO_NET_F_CTRL_VQ); + (1 << VIRTIO_NET_F_CTRL_VQ) | + (1 << VIRTIO_NET_F_CTRL_RX); return features; } @@ -127,6 +138,53 @@ static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, return VIRTIO_NET_OK; } +static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, + VirtQueueElement *elem) +{ + struct virtio_net_ctrl_mac mac_data; + + if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 || + elem->out_sg[1].iov_len < sizeof(mac_data) || + elem->out_sg[2].iov_len < sizeof(mac_data)) + return VIRTIO_NET_ERR; + + n->mac_table.in_use = 0; + memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); + + mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base); + + if (sizeof(mac_data.entries) + + (mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len) + return VIRTIO_NET_ERR; + + if (mac_data.entries <= MAC_TABLE_ENTRIES) { + memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data), + mac_data.entries * ETH_ALEN); + n->mac_table.in_use += mac_data.entries; + } else { + n->promisc = 1; + return VIRTIO_NET_OK; + } + + mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base); + + if (sizeof(mac_data.entries) + + (mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len) + return VIRTIO_NET_ERR; + + if (mac_data.entries) { + if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) { + memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN), + elem->out_sg[2].iov_base + sizeof(mac_data), + mac_data.entries * ETH_ALEN); + n->mac_table.in_use += mac_data.entries; + } else + n->allmulti = 1; + } + + return VIRTIO_NET_OK; +} + static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = to_virtio_net(vdev); @@ -151,6 +209,8 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE) status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem); + else if (ctrl.class == VIRTIO_NET_CTRL_MAC) + status = virtio_net_handle_mac(n, ctrl.cmd, &elem); stb_p(elem.in_sg[elem.in_num - 1].iov_base, status); @@ -226,6 +286,7 @@ static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) { static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; uint8_t *ptr = (uint8_t *)buf; + int i; if (n->promisc) return 1; @@ -244,6 +305,11 @@ static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) if (!memcmp(ptr, n->mac, ETH_ALEN)) return 1; + for (i = 0; i < n->mac_table.in_use; i++) { + if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) + return 1; + } + return 0; } @@ -406,6 +472,8 @@ static void virtio_net_save(QEMUFile *f, void *opaque) qemu_put_be16(f, n->status); qemu_put_be32(f, n->promisc); qemu_put_be32(f, n->allmulti); + qemu_put_be32(f, n->mac_table.in_use); + qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); } static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) @@ -429,6 +497,19 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) n->allmulti = qemu_get_be32(f); } + if (version_id >= 5) { + n->mac_table.in_use = qemu_get_be32(f); + /* MAC_TABLE_ENTRIES may be different from the saved image */ + if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { + qemu_get_buffer(f, n->mac_table.macs, + n->mac_table.in_use * ETH_ALEN); + } else if (n->mac_table.in_use) { + qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); + n->promisc = 1; + n->mac_table.in_use = 0; + } + } + if (n->tx_timer_active) { qemu_mod_timer(n->tx_timer, qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); @@ -474,6 +555,10 @@ void virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn) n->mergeable_rx_bufs = 0; n->promisc = 1; /* for compatibility */ + n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); + if (!n->mac_table.macs) + return; + register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION, virtio_net_save, virtio_net_load, n); } diff --git a/hw/virtio-net.h b/hw/virtio-net.h index ce8e4b48f0..291fa9da57 100644 --- a/hw/virtio-net.h +++ b/hw/virtio-net.h @@ -113,4 +113,26 @@ typedef uint8_t virtio_net_ctrl_ack; #define VIRTIO_NET_CTRL_RX_MODE_PROMISC 0 #define VIRTIO_NET_CTRL_RX_MODE_ALLMULTI 1 +/* + * Control the MAC filter table. + * + * The MAC filter table is managed by the hypervisor, the guest should + * assume the size is infinite. Filtering should be considered + * non-perfect, ie. based on hypervisor resources, the guest may + * received packets from sources not specified in the filter list. + * + * In addition to the class/cmd header, the TABLE_SET command requires + * two out scatterlists. Each contains a 4 byte count of entries followed + * by a concatenated byte stream of the ETH_ALEN MAC addresses. The + * first sg list contains unicast addresses, the second is for multicast. + * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature + * is available. + */ +struct virtio_net_ctrl_mac { + uint32_t entries; + uint8_t macs[][ETH_ALEN]; +}; +#define VIRTIO_NET_CTRL_MAC 1 + #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 + #endif