/*
* The dbfile has lines of the format:
* user type bridge nicname
*/
bool get_nic_if_avail(int fd, char *me, char *pid, char *intype, char *br, int allowed, char **nicname)
{
off_t len, slen;
struct stat sb;
char *buf = NULL, *newline;
int ret, count = 0;
cull_entries(fd, me, intype, br);
fstat(fd, &sb);
len = sb.st_size;
if (len != 0) {
buf = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (buf == MAP_FAILED) {
fprintf(stderr, "Failed to create mapping\n");
return false;
}
count = count_entries(buf, len, me, intype, br);
if (count >= allowed)
return false;
}
get_new_nicname(nicname, br, pid);
/* me ' ' intype ' ' br ' ' *nicname + '\n' + '\0' */
slen = strlen(me) + strlen(intype) + strlen(br) + strlen(*nicname) + 5;
newline = alloca(slen);
ret = snprintf(newline, slen, "%s %s %s %s\n", me, intype, br, *nicname);
if (ret < 0 || ret >= slen) {
if (lxc_netdev_delete_by_name(*nicname) != 0)
fprintf(stderr, "Error unlinking %s!\n", *nicname);
return false;
}
if (len)
munmap(buf, len);
if (ftruncate(fd, len + slen))
fprintf(stderr, "Failed to set new file size\n");
buf = mmap(NULL, len + slen, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (buf == MAP_FAILED) {
fprintf(stderr, "Failed to create mapping after extending: error %d\n", errno);
if (lxc_netdev_delete_by_name(*nicname) != 0)
fprintf(stderr, "Error unlinking %s!\n", *nicname);
return false;
}
strcpy(buf+len, newline);
munmap(buf, len+slen);
return true;
}
static bool create_nic(char *nic, char *br, int pid, char **cnic)
{
char *veth1buf, *veth2buf;
veth1buf = alloca(IFNAMSIZ);
veth2buf = alloca(IFNAMSIZ);
int ret, mtu;
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
fprintf(stderr, "host nic name too long\n");
return false;
}
/* create the nics */
if (instantiate_veth(veth1buf, &veth2buf) < 0) {
fprintf(stderr, "Error creating veth tunnel\n");
return false;
}
if (strcmp(br, "none") != 0) {
/* copy the bridge's mtu to both ends */
mtu = get_mtu(br);
if (mtu != -1) {
if (lxc_netdev_set_mtu(veth1buf, mtu) < 0 ||
lxc_netdev_set_mtu(veth2buf, mtu) < 0) {
fprintf(stderr, "Failed setting mtu\n");
goto out_del;
}
}
/* attach veth1 to bridge */
if (lxc_bridge_attach(lxcpath, lxcname, br, veth1buf) < 0) {
fprintf(stderr, "Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
}
/* pass veth2 to target netns */
ret = lxc_netdev_move_by_name(veth2buf, pid, NULL);
if (ret < 0) {
fprintf(stderr, "Error moving %s to netns %d\n", veth2buf, pid);
goto out_del;
}
*cnic = strdup(veth2buf);
return true;
out_del:
lxc_netdev_delete_by_name(veth1buf);
return false;
}
bool create_nic(char *nic, char *br, char *pidstr)
{
#if ISTEST
char path[200];
sprintf(path, "/tmp/lxcnettest/%s", nic);
int fd = open(path, O_RDWR|O_CREAT, S_IWUSR | S_IRUSR);
if (fd < 0)
return false;
close(fd);
return true;
#else
// not yet implemented
char *veth1buf, *veth2buf;
veth1buf = alloca(IFNAMSIZ);
veth2buf = alloca(IFNAMSIZ);
int ret;
int pid = atoi(pidstr);
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
fprintf(stderr, "nic name too long\n");
exit(1);
}
/* create the nics */
if (instanciate_veth(veth1buf, &veth2buf) < 0) {
fprintf(stderr, "Error creating veth tunnel\n");
return false;
}
/* attach veth1 to bridge */
if (lxc_bridge_attach(br, veth1buf) < 0) {
fprintf(stderr, "Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
/* pass veth2 to target netns */
ret = lxc_netdev_move(veth2buf, pid);
if (ret < 0) {
fprintf(stderr, "Error moving %s to netns %d\n", veth2buf, pid);
goto out_del;
}
return true;
out_del:
lxc_netdev_delete_by_name(veth1buf);
exit(1);
#endif
}
static bool create_nic(char *nic, char *br, int pid, char **cnic)
{
char *veth1buf, *veth2buf;
veth1buf = alloca(IFNAMSIZ);
veth2buf = alloca(IFNAMSIZ);
int ret;
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
fprintf(stderr, "host nic name too long\n");
return false;
}
/* create the nics */
if (instanciate_veth(veth1buf, &veth2buf) < 0) {
fprintf(stderr, "Error creating veth tunnel\n");
return false;
}
/* attach veth1 to bridge */
if (lxc_bridge_attach(br, veth1buf) < 0) {
fprintf(stderr, "Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
/* pass veth2 to target netns */
ret = lxc_netdev_move_by_name(veth2buf, pid);
if (ret < 0) {
fprintf(stderr, "Error moving %s to netns %d\n", veth2buf, pid);
goto out_del;
}
*cnic = strdup(veth2buf);
return true;
out_del:
lxc_netdev_delete_by_name(veth1buf);
return false;
}
static int create_nic(char *nic, char *br, int pid, char **cnic)
{
char veth1buf[IFNAMSIZ], veth2buf[IFNAMSIZ];
int mtu, ret;
ret = snprintf(veth1buf, IFNAMSIZ, "%s", nic);
if (ret < 0 || ret >= IFNAMSIZ) {
usernic_error("%s", "Could not create nic name\n");
return -1;
}
ret = snprintf(veth2buf, IFNAMSIZ, "%sp", veth1buf);
if (ret < 0 || ret >= IFNAMSIZ) {
usernic_error("%s\n", "Could not create nic name");
return -1;
}
/* create the nics */
ret = instantiate_veth(veth1buf, veth2buf);
if (ret < 0) {
usernic_error("%s", "Error creating veth tunnel\n");
return -1;
}
if (strcmp(br, "none")) {
/* copy the bridge's mtu to both ends */
mtu = get_mtu(br);
if (mtu > 0) {
ret = lxc_netdev_set_mtu(veth1buf, mtu);
if (ret < 0) {
usernic_error("Failed to set mtu to %d on %s\n",
mtu, veth1buf);
goto out_del;
}
ret = lxc_netdev_set_mtu(veth2buf, mtu);
if (ret < 0) {
usernic_error("Failed to set mtu to %d on %s\n",
mtu, veth2buf);
goto out_del;
}
}
/* attach veth1 to bridge */
ret = lxc_bridge_attach(br, veth1buf);
if (ret < 0) {
usernic_error("Error attaching %s to %s\n", veth1buf, br);
goto out_del;
}
}
/* pass veth2 to target netns */
ret = lxc_netdev_move_by_name(veth2buf, pid, NULL);
if (ret < 0) {
usernic_error("Error moving %s to network namespace of %d\n",
veth2buf, pid);
goto out_del;
}
*cnic = strdup(veth2buf);
if (!*cnic) {
usernic_error("Failed to copy string \"%s\"\n", veth2buf);
return -1;
}
return 0;
out_del:
lxc_netdev_delete_by_name(veth1buf);
return -1;
}
