github/linuxkit
1
0
Fork 0
mirror of https://github.com/linuxkit/linuxkit.git synced 2025-07-27 12:38:11 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
alpine/packages/tap-vsockd/tap-vsockd.c
View File

@ -17,6 +17,7 @@
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <net/if.h> #include <net/if.h>
#include <linux/if_tun.h> #include <linux/if_tun.h>
#include <net/if_arp.h>
#include <sys/types.h> #include <sys/types.h>
#include <sys/socket.h> #include <sys/socket.h>
@ -28,7 +29,7 @@
int verbose_flag = 0; int verbose_flag = 0;
int alloc_tap(char *dev) { int alloc_tap(const char *dev) {
int fd; int fd;
struct ifreq ifr; struct ifreq ifr;
const char *clonedev = "/dev/net/tun"; const char *clonedev = "/dev/net/tun";
@ -52,6 +53,22 @@ int alloc_tap(char *dev) {
return fd; 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 SVR_BUF_LEN (3 * 4096)
#define MAX_BUF_LEN (2 * 1024 * 1024) #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 /* Handle a connection. Handshake with the com.docker.slirp process and start
* exchanging ethernet frames between the socket and the tap device. * 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; struct connection connection;
pthread_t v2t, t2v; pthread_t v2t, t2v;
connection.fd = fd; connection.fd = fd;
connection.tapfd = tapfd;
negotiate(fd, &connection.vif); 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){ if (pthread_create(&v2t, NULL, vmnet_to_tap, &connection) != 0){
fprintf(stderr, "Failed to create the vmnet_to_tap thread\n"); fprintf(stderr, "Failed to create the vmnet_to_tap thread\n");
@ -231,7 +255,7 @@ static void handle(SOCKET fd, int tapfd)
/* Server: /* Server:
* accept() in an endless loop, handle a connection at a time * 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 lsock = INVALID_SOCKET;
SOCKET csock = 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", printf("Connect from: "GUID_FMT":"GUID_FMT"\n",
GUID_ARGS(sac.VmId), GUID_ARGS(sac.ServiceId)); GUID_ARGS(sac.VmId), GUID_ARGS(sac.ServiceId));
handle(csock, tapfd); handle(csock, tap);
closesocket(csock); closesocket(csock);
} }
} }
@ -292,8 +316,9 @@ int __cdecl main(int argc, char **argv)
int res = 0; int res = 0;
GUID sid; GUID sid;
int c; int c;
char *serviceid = NULL; /* Defaults to a testing GUID */
char *tap = "tap0"; char *serviceid = "3049197C-9A4E-4FBF-9367-97F792F16994";
char *tap = "eth1";
opterr = 0; opterr = 0;
while (1) { while (1) {
@ -327,7 +352,6 @@ int __cdecl main(int argc, char **argv)
} }
} }
fprintf(stderr, "serviceid=%s\n", serviceid); fprintf(stderr, "serviceid=%s\n", serviceid);
/* 3049197C-9A4E-4FBF-9367-97F792F16994 */
fprintf(stderr, "tap=%s\n", tap); fprintf(stderr, "tap=%s\n", tap);
res = parseguid(serviceid, &sid); res = parseguid(serviceid, &sid);
if (res) { if (res) {
@ -335,9 +359,8 @@ int __cdecl main(int argc, char **argv)
usage(argv[0]); usage(argv[0]);
exit(1); exit(1);
} }
int tapfd = alloc_tap(tap);
server(sid, tapfd); server(sid, tap);
return 0; return 0;
} }