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tap-vsockd: set the MAC address on the TAP device

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The vmnet protocol expects to tell the client what the MAC address is.
This patch sets it on the TAP device.

Signed-off-by: David Scott <dave.scott@docker.com>
This commit is contained in:
David Scott 2016-05-13 11:55:04 +01:00
parent b45ac6d9a8
commit 4f4c807245
1 changed files with 33 additions and 10 deletions
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43
alpine/packages/tap-vsockd/tap-vsockd.c
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@ -17,6 +17,7 @@
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <net/if_arp.h>
#include <sys/types.h>
#include <sys/socket.h>
@ -28,7 +29,7 @@
int verbose_flag = 0;
int alloc_tap(char *dev) {
int alloc_tap(const char *dev) {
int fd;
struct ifreq ifr;
const char *clonedev = "/dev/net/tun";
@ -52,6 +53,22 @@ int alloc_tap(char *dev) {
return fd;
}
void set_macaddr(const char *dev, uint8_t *mac) {
int fd;
struct ifreq ifq;
fd = socket(PF_INET, SOCK_DGRAM, 0);
strcpy(ifq.ifr_name, dev);
memcpy(&ifq.ifr_hwaddr.sa_data[0], mac, 6);
ifq.ifr_hwaddr.sa_family = ARPHRD_ETHER;
if (ioctl(fd, SIOCSIFHWADDR, &ifq) == -1) {
perror("SIOCSIFHWADDR failed");
exit(1);
}
close(fd);
}
#define SVR_BUF_LEN (3 * 4096)
#define MAX_BUF_LEN (2 * 1024 * 1024)
@ -200,14 +217,21 @@ static void* tap_to_vmnet(void *arg)
/* Handle a connection. Handshake with the com.docker.slirp process and start
* exchanging ethernet frames between the socket and the tap device.
*/
static void handle(SOCKET fd, int tapfd)
static void handle(SOCKET fd, const char *tap)
{
struct connection connection;
pthread_t v2t, t2v;
connection.fd = fd;
connection.tapfd = tapfd;
negotiate(fd, &connection.vif);
fprintf(stderr, "VMNET VIF has MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
connection.vif.mac[0], connection.vif.mac[1], connection.vif.mac[2],
connection.vif.mac[3], connection.vif.mac[4], connection.vif.mac[5]
);
int tapfd = alloc_tap(tap);
set_macaddr(tap, &connection.vif.mac[0]);
connection.tapfd = tapfd;
if (pthread_create(&v2t, NULL, vmnet_to_tap, &connection) != 0){
fprintf(stderr, "Failed to create the vmnet_to_tap thread\n");
@ -231,7 +255,7 @@ static void handle(SOCKET fd, int tapfd)
/* Server:
* accept() in an endless loop, handle a connection at a time
*/
static int server(GUID serviceid, int tapfd)
static int server(GUID serviceid, const char *tap)
{
SOCKET lsock = INVALID_SOCKET;
SOCKET csock = INVALID_SOCKET;
@ -275,7 +299,7 @@ static int server(GUID serviceid, int tapfd)
printf("Connect from: "GUID_FMT":"GUID_FMT"\n",
GUID_ARGS(sac.VmId), GUID_ARGS(sac.ServiceId));
handle(csock, tapfd);
handle(csock, tap);
closesocket(csock);
}
}
@ -292,8 +316,9 @@ int __cdecl main(int argc, char **argv)
int res = 0;
GUID sid;
int c;
char *serviceid = NULL;
char *tap = "tap0";
/* Defaults to a testing GUID */
char *serviceid = "3049197C-9A4E-4FBF-9367-97F792F16994";
char *tap = "eth1";
opterr = 0;
while (1) {
@ -327,7 +352,6 @@ int __cdecl main(int argc, char **argv)
}
}
fprintf(stderr, "serviceid=%s\n", serviceid);
/* 3049197C-9A4E-4FBF-9367-97F792F16994 */
fprintf(stderr, "tap=%s\n", tap);
res = parseguid(serviceid, &sid);
if (res) {
@ -335,9 +359,8 @@ int __cdecl main(int argc, char **argv)
usage(argv[0]);
exit(1);
}
int tapfd = alloc_tap(tap);
server(sid, tapfd);
server(sid, tap);
return 0;
}