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hyperv: Add support for setting MAC from within guests

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This adds support for setting synthetic NIC MAC address from within Linux
guests. Before using this feature, the option "spoofing of MAC address"
should be enabled at the Hyper-V manager / Settings of the synthetic
NIC.

Thanks to Kin Cho <kcho@infoblox.com> for the initial implementation and
tests. And, thanks to Long Li <longli@microsoft.com> for the debugging
works.

Reported-and-tested-by: Kin Cho <kcho@infoblox.com>
Reported-by: Long Li <longli@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haiyang Zhang 2012-07-10 07:19:22 +00:00 committed by David S. Miller
parent 5e96855fc5
commit 1ce09e899d
3 changed files with 109 additions and 1 deletions
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1
drivers/net/hyperv/hyperv_net.h
View File

@ -131,6 +131,7 @@ int rndis_filter_send(struct hv_device *dev,
struct hv_netvsc_packet *pkt);
int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter);
int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac);
#define NVSP_INVALID_PROTOCOL_VERSION ((u32)0xFFFFFFFF)

30
drivers/net/hyperv/netvsc_drv.c
View File

@ -341,6 +341,34 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu)
return 0;
}
static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
{
struct net_device_context *ndevctx = netdev_priv(ndev);
struct hv_device *hdev = ndevctx->device_ctx;
struct sockaddr *addr = p;
char save_adr[14];
unsigned char save_aatype;
int err;
memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
save_aatype = ndev->addr_assign_type;
err = eth_mac_addr(ndev, p);
if (err != 0)
return err;
err = rndis_filter_set_device_mac(hdev, addr->sa_data);
if (err != 0) {
/* roll back to saved MAC */
memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
ndev->addr_assign_type = save_aatype;
}
return err;
}
static const struct ethtool_ops ethtool_ops = {
.get_drvinfo = netvsc_get_drvinfo,
.get_link = ethtool_op_get_link,
@ -353,7 +381,7 @@ static const struct net_device_ops device_ops = {
.ndo_set_rx_mode = netvsc_set_multicast_list,
.ndo_change_mtu = netvsc_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
.ndo_set_mac_address = netvsc_set_mac_addr,
};
/*

79
drivers/net/hyperv/rndis_filter.c
View File

@ -27,6 +27,7 @@
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/nls.h>
#include "hyperv_net.h"
@ -47,6 +48,7 @@ struct rndis_request {
struct hv_page_buffer buf;
/* FIXME: We assumed a fixed size request here. */
struct rndis_message request_msg;
u8 ext[100];
};
static void rndis_filter_send_completion(void *ctx);
@ -511,6 +513,83 @@ static int rndis_filter_query_device_mac(struct rndis_device *dev)
dev->hw_mac_adr, &size);
}
#define NWADR_STR "NetworkAddress"
#define NWADR_STRLEN 14
int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
{
struct netvsc_device *nvdev = hv_get_drvdata(hdev);
struct rndis_device *rdev = nvdev->extension;
struct net_device *ndev = nvdev->ndev;
struct rndis_request *request;
struct rndis_set_request *set;
struct rndis_config_parameter_info *cpi;
wchar_t *cfg_nwadr, *cfg_mac;
struct rndis_set_complete *set_complete;
char macstr[2*ETH_ALEN+1];
u32 extlen = sizeof(struct rndis_config_parameter_info) +
2*NWADR_STRLEN + 4*ETH_ALEN;
int ret, t;
request = get_rndis_request(rdev, RNDIS_MSG_SET,
RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
if (!request)
return -ENOMEM;
set = &request->request_msg.msg.set_req;
set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
set->info_buflen = extlen;
set->info_buf_offset = sizeof(struct rndis_set_request);
set->dev_vc_handle = 0;
cpi = (struct rndis_config_parameter_info *)((ulong)set +
set->info_buf_offset);
cpi->parameter_name_offset =
sizeof(struct rndis_config_parameter_info);
/* Multiply by 2 because host needs 2 bytes (utf16) for each char */
cpi->parameter_name_length = 2*NWADR_STRLEN;
cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
cpi->parameter_value_offset =
cpi->parameter_name_offset + cpi->parameter_name_length;
/* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
cpi->parameter_value_length = 4*ETH_ALEN;
cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, UTF16_HOST_ENDIAN,
cfg_nwadr, NWADR_STRLEN);
if (ret < 0)
goto cleanup;
snprintf(macstr, 2*ETH_ALEN+1, "%pm", mac);
ret = utf8s_to_utf16s(macstr, 2*ETH_ALEN, UTF16_HOST_ENDIAN,
cfg_mac, 2*ETH_ALEN);
if (ret < 0)
goto cleanup;
ret = rndis_filter_send_request(rdev, request);
if (ret != 0)
goto cleanup;
t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
if (t == 0) {
netdev_err(ndev, "timeout before we got a set response...\n");
/*
* can't put_rndis_request, since we may still receive a
* send-completion.
*/
return -EBUSY;
} else {
set_complete = &request->response_msg.msg.set_complete;
if (set_complete->status != RNDIS_STATUS_SUCCESS)
ret = -EINVAL;
}
cleanup:
put_rndis_request(rdev, request);
return ret;
}
static int rndis_filter_query_device_link_status(struct rndis_device *dev)
{
u32 size = sizeof(u32);