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minix/servers/rs/manager.c
Ben Gras 50e2064049 No more intel/minix segments. 
This commit removes all traces of Minix segments (the text/data/stack
memory map abstraction in the kernel) and significance of Intel segments
(hardware segments like CS, DS that add offsets to all addressing before
page table translation). This ultimately simplifies the memory layout
and addressing and makes the same layout possible on non-Intel
architectures.

There are only two types of addresses in the world now: virtual
and physical; even the kernel and processes have the same virtual
address space. Kernel and user processes can be distinguished at a
glance as processes won't use 0xF0000000 and above.

No static pre-allocated memory sizes exist any more.

Changes to booting:
        . The pre_init.c leaves the kernel and modules exactly as
          they were left by the bootloader in physical memory
        . The kernel starts running using physical addressing,
          loaded at a fixed location given in its linker script by the
          bootloader.  All code and data in this phase are linked to
          this fixed low location.
        . It makes a bootstrap pagetable to map itself to a
          fixed high location (also in linker script) and jumps to
          the high address. All code and data then use this high addressing.
        . All code/data symbols linked at the low addresses is prefixed by
          an objcopy step with __k_unpaged_*, so that that code cannot
          reference highly-linked symbols (which aren't valid yet) or vice
          versa (symbols that aren't valid any more).
        . The two addressing modes are separated in the linker script by
          collecting the unpaged_*.o objects and linking them with low
          addresses, and linking the rest high. Some objects are linked
          twice, once low and once high.
        . The bootstrap phase passes a lot of information (e.g. free memory
          list, physical location of the modules, etc.) using the kinfo
          struct.
        . After this bootstrap the low-linked part is freed.
        . The kernel maps in VM into the bootstrap page table so that VM can
          begin executing. Its first job is to make page tables for all other
          boot processes. So VM runs before RS, and RS gets a fully dynamic,
          VM-managed address space. VM gets its privilege info from RS as usual
          but that happens after RS starts running.
        . Both the kernel loading VM and VM organizing boot processes happen
	  using the libexec logic. This removes the last reason for VM to
	  still know much about exec() and vm/exec.c is gone.

Further Implementation:
        . All segments are based at 0 and have a 4 GB limit.
        . The kernel is mapped in at the top of the virtual address
          space so as not to constrain the user processes.
        . Processes do not use segments from the LDT at all; there are
          no segments in the LDT any more, so no LLDT is needed.
        . The Minix segments T/D/S are gone and so none of the
          user-space or in-kernel copy functions use them. The copy
          functions use a process endpoint of NONE to realize it's
          a physical address, virtual otherwise.
        . The umap call only makes sense to translate a virtual address
          to a physical address now.
        . Segments-related calls like newmap and alloc_segments are gone.
        . All segments-related translation in VM is gone (vir2map etc).
        . Initialization in VM is simpler as no moving around is necessary.
        . VM and all other boot processes can be linked wherever they wish
          and will be mapped in at the right location by the kernel and VM
          respectively.

Other changes:
        . The multiboot code is less special: it does not use mb_print
          for its diagnostics any more but uses printf() as normal, saving
          the output into the diagnostics buffer, only printing to the
          screen using the direct print functions if a panic() occurs.
        . The multiboot code uses the flexible 'free memory map list'
          style to receive the list of free memory if available.
        . The kernel determines the memory layout of the processes to
          a degree: it tells VM where the kernel starts and ends and
          where the kernel wants the top of the process to be. VM then
          uses this entire range, i.e. the stack is right at the top,
          and mmap()ped bits of memory are placed below that downwards,
          and the break grows upwards.

Other Consequences:
        . Every process gets its own page table as address spaces
          can't be separated any more by segments.
        . As all segments are 0-based, there is no distinction between
          virtual and linear addresses, nor between userspace and
          kernel addresses.
        . Less work is done when context switching, leading to a net
          performance increase. (8% faster on my machine for 'make servers'.)
	. The layout and configuration of the GDT makes sysenter and syscall
	  possible.
2012-07-15 22:30:15 +02:00

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/*
* Changes:
* Nov 22, 2009: added basic live update support (Cristiano Giuffrida)
* Mar 02, 2009: Extended isolation policies (Jorrit N. Herder)
* Jul 22, 2005: Created (Jorrit N. Herder)
*/
#include "inc.h"
#include "kernel/proc.h"
/*===========================================================================*
* caller_is_root *
*===========================================================================*/
static int caller_is_root(endpoint)
endpoint_t endpoint; /* caller endpoint */
{
uid_t euid;
/* Check if caller has root user ID. */
euid = getnuid(endpoint);
if (rs_verbose && euid != 0)
{
printf("RS: got unauthorized request from endpoint %d\n", endpoint);
}
return euid == 0;
}
/*===========================================================================*
* caller_can_control *
*===========================================================================*/
static int caller_can_control(endpoint, target_rp)
endpoint_t endpoint;
struct rproc *target_rp;
{
int control_allowed = 0;
register struct rproc *rp;
register struct rprocpub *rpub;
char *proc_name;
int c;
proc_name = target_rp->r_pub->proc_name;
/* Check if label is listed in caller's isolation policy. */
for (rp = BEG_RPROC_ADDR; rp < END_RPROC_ADDR; rp++) {
if (!(rp->r_flags & RS_IN_USE))
continue;
rpub = rp->r_pub;
if (rpub->endpoint == endpoint) {
break;
}
}
if (rp == END_RPROC_ADDR) return 0;
for (c = 0; c < rp->r_nr_control; c++) {
if (strcmp(rp->r_control[c], proc_name) == 0) {
control_allowed = 1;
break;
}
}
if (rs_verbose)
printf("RS: allowing %u control over %s via policy: %s\n",
endpoint, target_rp->r_pub->label,
control_allowed ? "yes" : "no");
return control_allowed;
}
/*===========================================================================*
* check_call_permission *
*===========================================================================*/
int check_call_permission(caller, call, rp)
endpoint_t caller;
int call;
struct rproc *rp;
{
/* Check if the caller has permission to execute a particular call. */
struct rprocpub *rpub;
int call_allowed;
/* Caller should be either root or have control privileges. */
call_allowed = caller_is_root(caller);
if(rp) {
call_allowed |= caller_can_control(caller, rp);
}
if(!call_allowed) {
return EPERM;
}
if(rp) {
rpub = rp->r_pub;
/* Only allow RS_EDIT if the target is a user process. */
if(!(rp->r_priv.s_flags & SYS_PROC)) {
if(call != RS_EDIT) return EPERM;
}
/* Disallow the call if another call is in progress for the service. */
if((rp->r_flags & RS_LATEREPLY)
|| (rp->r_flags & RS_INITIALIZING) || (rp->r_flags & RS_UPDATING)) {
return EBUSY;
}
/* Only allow RS_DOWN and RS_RESTART if the service has terminated. */
if(rp->r_flags & RS_TERMINATED) {
if(call != RS_DOWN && call != RS_RESTART) return EPERM;
}
/* Disallow RS_DOWN for core system services. */
if (rpub->sys_flags & SF_CORE_SRV) {
if(call == RS_DOWN) return EPERM;
}
}
return OK;
}
/*===========================================================================*
* copy_rs_start *
*===========================================================================*/
int copy_rs_start(src_e, src_rs_start, dst_rs_start)
endpoint_t src_e;
char *src_rs_start;
struct rs_start *dst_rs_start;
{
int r;
r = sys_datacopy(src_e, (vir_bytes) src_rs_start,
SELF, (vir_bytes) dst_rs_start, sizeof(struct rs_start));
return r;
}
/*===========================================================================*
* copy_label *
*===========================================================================*/
int copy_label(src_e, src_label, src_len, dst_label, dst_len)
endpoint_t src_e;
char *src_label;
size_t src_len;
char *dst_label;
size_t dst_len;
{
int s, len;
len = MIN(dst_len-1, src_len);
s = sys_datacopy(src_e, (vir_bytes) src_label,
SELF, (vir_bytes) dst_label, len);
if (s != OK) return s;
dst_label[len] = 0;
return OK;
}
/*===========================================================================*
* build_cmd_dep *
*===========================================================================*/
void build_cmd_dep(struct rproc *rp)
{
struct rprocpub *rpub;
int arg_count;
int len;
char *cmd_ptr;
rpub = rp->r_pub;
/* Build argument vector to be passed to execute call. The format of the
* arguments vector is: path, arguments, NULL.
*/
strcpy(rp->r_args, rp->r_cmd); /* copy raw command */
arg_count = 0; /* initialize arg count */
rp->r_argv[arg_count++] = rp->r_args; /* start with path */
cmd_ptr = rp->r_args; /* do some parsing */
while(*cmd_ptr != '\0') { /* stop at end of string */
if (*cmd_ptr == ' ') { /* next argument */
*cmd_ptr = '\0'; /* terminate previous */
while (*++cmd_ptr == ' ') ; /* skip spaces */
if (*cmd_ptr == '\0') break; /* no arg following */
/* There are ARGV_ELEMENTS elements; must leave one for null */
if (arg_count>=ARGV_ELEMENTS-1) { /* arg vector full */
printf("RS: build_cmd_dep: too many args\n");
break;
}
assert(arg_count < ARGV_ELEMENTS);
rp->r_argv[arg_count++] = cmd_ptr; /* add to arg vector */
}
cmd_ptr ++; /* continue parsing */
}
assert(arg_count < ARGV_ELEMENTS);
rp->r_argv[arg_count] = NULL; /* end with NULL pointer */
rp->r_argc = arg_count;
/* Build process name. */
cmd_ptr = strrchr(rp->r_argv[0], '/');
if (cmd_ptr)
cmd_ptr++;
else
cmd_ptr= rp->r_argv[0];
len= strlen(cmd_ptr);
if (len > RS_MAX_LABEL_LEN-1)
len= RS_MAX_LABEL_LEN-1; /* truncate name */
memcpy(rpub->proc_name, cmd_ptr, len);
rpub->proc_name[len]= '\0';
}
/*===========================================================================*
* srv_fork *
*===========================================================================*/
pid_t srv_fork(uid_t reuid, gid_t regid)
{
message m;
m.m1_i1 = (int) reuid;
m.m1_i2 = (int) regid;
return _syscall(PM_PROC_NR, SRV_FORK, &m);
}
/*===========================================================================*
* srv_kill *
*===========================================================================*/
int srv_kill(pid_t pid, int sig)
{
message m;
m.m1_i1 = pid;
m.m1_i2 = sig;
return(_syscall(PM_PROC_NR, SRV_KILL, &m));
}
/*===========================================================================*
* srv_update *
*===========================================================================*/
int srv_update(endpoint_t src_e, endpoint_t dst_e)
{
int r;
/* Ask VM to swap the slots of the two processes and tell the kernel to
* do the same. If VM is the service being updated, only perform the kernel
* part of the call. The new instance of VM will do the rest at
* initialization time.
*/
if(src_e != VM_PROC_NR) {
r = vm_update(src_e, dst_e);
}
else {
r = sys_update(src_e, dst_e);
}
return r;
}
/*===========================================================================*
* update_period *
*===========================================================================*/
void update_period(message *m_ptr)
{
clock_t now = m_ptr->NOTIFY_TIMESTAMP;
short has_update_timed_out;
message m;
struct rprocpub *rpub;
rpub = rupdate.rp->r_pub;
/* See if a timeout has occurred. */
has_update_timed_out = (now - rupdate.prepare_tm > rupdate.prepare_maxtime);
/* If an update timed out, end the update process and notify
* the old version that the update has been canceled. From now on, the old
* version will continue executing.
*/
if(has_update_timed_out) {
printf("RS: update failed: maximum prepare time reached\n");
end_update(EINTR, RS_DONTREPLY);
/* Prepare cancel request. */
m.m_type = RS_LU_PREPARE;
m.RS_LU_STATE = SEF_LU_STATE_NULL;
if(rpub->endpoint == RS_PROC_NR) {
/* RS can process the request directly. */
do_sef_lu_request(&m);
}
else {
/* Send request message to the system service. */
asynsend(rpub->endpoint, &m);
}
}
}
/*===========================================================================*
* end_update *
*===========================================================================*/
void end_update(int result, int reply_flag)
{
/* End the update process. There are two possibilities:
* 1) the update succeeded. In that case, cleanup the old version and mark the
* new version as no longer under update.
* 2) the update failed. In that case, cleanup the new version and mark the old
* version as no longer under update. Eventual late ready to update
* messages (if any) will simply be ignored and the service can
* continue executing. In addition, reset the check timestamp, so that if the
* service has a period, a status request will be forced in the next period.
*/
struct rproc *old_rp, *new_rp, *exiting_rp, *surviving_rp;
struct rproc **rps;
int nr_rps, i;
old_rp = rupdate.rp;
new_rp = old_rp->r_new_rp;
if(rs_verbose)
printf("RS: ending update from %s to %s with result: %d\n",
srv_to_string(old_rp), srv_to_string(new_rp), result);
/* Decide which version has to die out and which version has to survive. */
surviving_rp = (result == OK ? new_rp : old_rp);
exiting_rp = (result == OK ? old_rp : new_rp);
/* End update. */
rupdate.flags &= ~RS_UPDATING;
rupdate.rp = NULL;
old_rp->r_new_rp = NULL;
new_rp->r_old_rp = NULL;
old_rp->r_check_tm = 0;
/* Send a late reply if necessary. */
late_reply(old_rp, result);
/* Mark the version that has to survive as no longer updating and
* reply when asked to.
*/
surviving_rp->r_flags &= ~RS_UPDATING;
if(reply_flag == RS_REPLY) {
message m;
m.m_type = result;
reply(surviving_rp->r_pub->endpoint, surviving_rp, &m);
}
/* Cleanup the version that has to die out. */
get_service_instances(exiting_rp, &rps, &nr_rps);
for(i=0;i<nr_rps;i++) {
cleanup_service(rps[i]);
}
if(rs_verbose)
printf("RS: %s ended the update\n", srv_to_string(surviving_rp));
}
/*===========================================================================*
* kill_service_debug *
*===========================================================================*/
int kill_service_debug(file, line, rp, errstr, err)
char *file;
int line;
struct rproc *rp;
char *errstr;
int err;
{
/* Crash a system service and don't let it restart. */
if(errstr && !shutting_down) {
printf("RS: %s (error %d)\n", errstr, err);
}
rp->r_flags |= RS_EXITING; /* expect exit */
crash_service_debug(file, line, rp); /* simulate crash */
return err;
}
/*===========================================================================*
* crash_service_debug *
*===========================================================================*/
int crash_service_debug(file, line, rp)
char *file;
int line;
struct rproc *rp;
{
/* Simluate a crash in a system service. */
struct rprocpub *rpub;
rpub = rp->r_pub;
if(rs_verbose)
printf("RS: %s %skilled at %s:%d\n", srv_to_string(rp),
rp->r_flags & RS_EXITING ? "lethally " : "", file, line);
/* RS should simply exit() directly. */
if(rpub->endpoint == RS_PROC_NR) {
exit(1);
}
return sys_kill(rpub->endpoint, SIGKILL);
}
/*===========================================================================*
* cleanup_service_debug *
*===========================================================================*/
void cleanup_service_debug(file, line, rp)
char *file;
int line;
struct rproc *rp;
{
struct rprocpub *rpub;
int s;
rpub = rp->r_pub;
if(rs_verbose)
printf("RS: %s cleaned up at %s:%d\n", srv_to_string(rp),
file, line);
/* Tell scheduler this process is finished */
if ((s = sched_stop(rp->r_scheduler, rpub->endpoint)) != OK) {
printf("RS: warning: scheduler won't give up process: %d\n", s);
}
/* Ask PM to exit the service */
if(rp->r_pid == -1) {
printf("RS: warning: attempt to kill pid -1!\n");
}
else {
srv_kill(rp->r_pid, SIGKILL);
}
/* Free slot, unless we're about to reuse it */
if (!(rp->r_flags & RS_REINCARNATE))
free_slot(rp);
}
/*===========================================================================*
* create_service *
*===========================================================================*/
int create_service(rp)
struct rproc *rp;
{
/* Create the given system service. */
int child_proc_nr_e, child_proc_nr_n; /* child process slot */
pid_t child_pid; /* child's process id */
int s, use_copy, has_replica;
extern char **environ;
struct rprocpub *rpub;
rpub = rp->r_pub;
use_copy= (rpub->sys_flags & SF_USE_COPY);
has_replica= (rp->r_old_rp
|| (rp->r_prev_rp && !(rp->r_prev_rp->r_flags & RS_TERMINATED)));
/* Do we need an existing replica to create the service? */
if(!has_replica && (rpub->sys_flags & SF_NEED_REPL)) {
printf("RS: unable to create service '%s' without a replica\n",
rpub->label);
free_slot(rp);
return(EPERM);
}
/* Do we need an in-memory copy to create the service? */
if(!use_copy && (rpub->sys_flags & SF_NEED_COPY)) {
printf("RS: unable to create service '%s' without an in-memory copy\n",
rpub->label);
free_slot(rp);
return(EPERM);
}
/* Do we have a copy or a command to create the service? */
if(!use_copy && !strcmp(rp->r_cmd, "")) {
printf("RS: unable to create service '%s' without a copy or command\n",
rpub->label);
free_slot(rp);
return(EPERM);
}
/* Now fork and branch for parent and child process (and check for error).
* After fork()ing, we need to pin RS memory again or pagefaults will occur
* on future writes.
*/
if(rs_verbose)
printf("RS: forking child with srv_fork()...\n");
child_pid= srv_fork(rp->r_uid, 0); /* Force group to operator for now */
if(child_pid == -1) {
printf("RS: srv_fork() failed (error %d)\n", errno);
free_slot(rp);
return(errno);
}
/* Get endpoint of the child. */
child_proc_nr_e = getnprocnr(child_pid);
/* There is now a child process. Update the system process table. */
child_proc_nr_n = _ENDPOINT_P(child_proc_nr_e);
rp->r_flags = RS_IN_USE; /* mark slot in use */
rpub->endpoint = child_proc_nr_e; /* set child endpoint */
rp->r_pid = child_pid; /* set child pid */
rp->r_check_tm = 0; /* not checked yet */
getuptime(&rp->r_alive_tm); /* currently alive */
rp->r_stop_tm = 0; /* not exiting yet */
rp->r_backoff = 0; /* not to be restarted */
rproc_ptr[child_proc_nr_n] = rp; /* mapping for fast access */
rpub->in_use = TRUE; /* public entry is now in use */
/* Set and synch the privilege structure for the new service. */
if ((s = sys_privctl(child_proc_nr_e, SYS_PRIV_SET_SYS, &rp->r_priv)) != OK
|| (s = sys_getpriv(&rp->r_priv, child_proc_nr_e)) != OK) {
printf("RS: unable to set privilege structure: %d\n", s);
cleanup_service(rp);
vm_memctl(RS_PROC_NR, VM_RS_MEM_PIN);
return ENOMEM;
}
/* Set the scheduler for this process */
if ((s = sched_init_proc(rp)) != OK) {
printf("RS: unable to start scheduling: %d\n", s);
cleanup_service(rp);
vm_memctl(RS_PROC_NR, VM_RS_MEM_PIN);
return s;
}
/* Copy the executable image into the child process. If no copy exists,
* allocate one and free it right after exec completes.
*/
if(use_copy) {
if(rs_verbose)
printf("RS: %s uses an in-memory copy\n",
srv_to_string(rp));
}
else {
if ((s = read_exec(rp)) != OK) {
printf("RS: read_exec failed: %d\n", s);
cleanup_service(rp);
vm_memctl(RS_PROC_NR, VM_RS_MEM_PIN);
return s;
}
}
if(rs_verbose)
printf("RS: execing child with srv_execve()...\n");
s = srv_execve(child_proc_nr_e, rp->r_exec, rp->r_exec_len, rp->r_argv,
environ);
vm_memctl(RS_PROC_NR, VM_RS_MEM_PIN);
if (s != OK) {
printf("RS: srv_execve failed: %d\n", s);
cleanup_service(rp);
return s;
}
if(!use_copy) {
free_exec(rp);
}
/* If this is a VM instance, let VM know now. */
if(rp->r_priv.s_flags & VM_SYS_PROC) {
if(rs_verbose)
printf("RS: informing VM of instance %s\n", srv_to_string(rp));
s = vm_memctl(rpub->endpoint, VM_RS_MEM_MAKE_VM);
if(s != OK) {
printf("vm_memctl failed: %d\n", s);
cleanup_service(rp);
return s;
}
}
/* Tell VM about allowed calls. */
if ((s = vm_set_priv(rpub->endpoint, &rpub->vm_call_mask[0])) != OK) {
printf("RS: vm_set_priv failed: %d\n", s);
cleanup_service(rp);
return s;
}
if(rs_verbose)
printf("RS: %s created\n", srv_to_string(rp));
return OK;
}
/*===========================================================================*
* clone_service *
*===========================================================================*/
int clone_service(rp, instance_flag)
struct rproc *rp;
int instance_flag;
{
/* Clone the given system service instance. */
struct rproc *replica_rp;
struct rprocpub *replica_rpub;
struct rproc **rp_link;
struct rproc **replica_link;
struct rproc *rs_rp;
int rs_flags;
int r;
if(rs_verbose)
printf("RS: creating a replica for %s\n", srv_to_string(rp));
/* Clone slot. */
if((r = clone_slot(rp, &replica_rp)) != OK) {
return r;
}
replica_rpub = replica_rp->r_pub;
/* Clone is a live updated or restarted service instance? */
if(instance_flag == LU_SYS_PROC) {
rp_link = &rp->r_new_rp;
replica_link = &replica_rp->r_old_rp;
}
else {
rp_link = &rp->r_next_rp;
replica_link = &replica_rp->r_prev_rp;
}
replica_rp->r_priv.s_flags |= instance_flag;
/* Link the two slots. */
*rp_link = replica_rp;
*replica_link = rp;
/* Create a new replica of the service. */
r = create_service(replica_rp);
if(r != OK) {
*rp_link = NULL;
return r;
}
/* If this instance is for restarting RS, set up a backup signal manager. */
rs_flags = (ROOT_SYS_PROC | RST_SYS_PROC);
if((replica_rp->r_priv.s_flags & rs_flags) == rs_flags) {
rs_rp = rproc_ptr[_ENDPOINT_P(RS_PROC_NR)];
/* Update signal managers. */
r = update_sig_mgrs(rs_rp, SELF, replica_rpub->endpoint);
if(r == OK) {
r = update_sig_mgrs(replica_rp, SELF, NONE);
}
if(r != OK) {
*rp_link = NULL;
return kill_service(replica_rp, "update_sig_mgrs failed", r);
}
}
return OK;
}
/*===========================================================================*
* publish_service *
*===========================================================================*/
int publish_service(rp)
struct rproc *rp; /* pointer to service slot */
{
/* Publish a service. */
int r;
struct rprocpub *rpub;
struct rs_pci pci_acl;
message m;
endpoint_t ep;
rpub = rp->r_pub;
/* Register label with DS. */
r = ds_publish_label(rpub->label, rpub->endpoint, DSF_OVERWRITE);
if (r != OK) {
return kill_service(rp, "ds_publish_label call failed", r);
}
/* If the service is a driver, map it. */
if (rpub->dev_nr > 0) {
/* The purpose of non-blocking forks is to avoid involving VFS in the
* forking process, because VFS may be blocked on a sendrec() to a MFS
* that is waiting for a endpoint update for a dead driver. We have just
* published that update, but VFS may still be blocked. As a result, VFS
* may not yet have received PM's fork message. Hence, if we call
* mapdriver() immediately, VFS may not know about the process and thus
* refuse to add the driver entry. The following temporary hack works
* around this by forcing blocking communication from PM to VFS. Once VFS
* has been made non-blocking towards MFS instances, this hack and the
* big part of srv_fork() can go.
*/
setuid(0);
if (mapdriver(rpub->label, rpub->dev_nr, rpub->dev_style,
rpub->dev_flags) != OK) {
return kill_service(rp, "couldn't map driver", errno);
}
}
/* If PCI properties are set, inform the PCI driver about the new service. */
if(rpub->pci_acl.rsp_nr_device || rpub->pci_acl.rsp_nr_class) {
pci_acl = rpub->pci_acl;
strcpy(pci_acl.rsp_label, rpub->label);
pci_acl.rsp_endpoint= rpub->endpoint;
r = pci_set_acl(&pci_acl);
if (r != OK) {
return kill_service(rp, "pci_set_acl call failed", r);
}
}
if (rpub->devman_id != 0) {
r = ds_retrieve_label_endpt("devman",&ep);
if (r != OK) {
return kill_service(rp, "devman not running?", r);
}
m.m_type = DEVMAN_BIND;
m.DEVMAN_ENDPOINT = rpub->endpoint;
m.DEVMAN_DEVICE_ID = rpub->devman_id;
r = sendrec(ep, &m);
if (r != OK || m.DEVMAN_RESULT != OK) {
return kill_service(rp, "devman bind device failed", r);
}
}
if(rs_verbose)
printf("RS: %s published\n", srv_to_string(rp));
return OK;
}
/*===========================================================================*
* unpublish_service *
*===========================================================================*/
int unpublish_service(rp)
struct rproc *rp; /* pointer to service slot */
{
/* Unpublish a service. */
struct rprocpub *rpub;
int r, result;
message m;
endpoint_t ep;
rpub = rp->r_pub;
result = OK;
/* Unregister label with DS. */
r = ds_delete_label(rpub->label);
if (r != OK && !shutting_down) {
printf("RS: ds_delete_label call failed (error %d)\n", r);
result = r;
}
/* No need to inform VFS and VM, cleanup is done on exit automatically. */
/* If PCI properties are set, inform the PCI driver. */
if(rpub->pci_acl.rsp_nr_device || rpub->pci_acl.rsp_nr_class) {
r = pci_del_acl(rpub->endpoint);
if (r != OK && !shutting_down) {
printf("RS: pci_del_acl call failed (error %d)\n", r);
result = r;
}
}
if (rpub->devman_id != 0) {
r = ds_retrieve_label_endpt("devman",&ep);
if (r != OK) {
printf("RS: devman not running?");
} else {
m.m_type = DEVMAN_UNBIND;
m.DEVMAN_ENDPOINT = rpub->endpoint;
m.DEVMAN_DEVICE_ID = rpub->devman_id;
r = sendrec(ep, &m);
if (r != OK || m.DEVMAN_RESULT != OK) {
printf("RS: devman unbind device failed");
}
}
}
if(rs_verbose)
printf("RS: %s unpublished\n", srv_to_string(rp));
return result;
}
/*===========================================================================*
* run_service *
*===========================================================================*/
int run_service(rp, init_type)
struct rproc *rp;
int init_type;
{
/* Let a newly created service run. */
struct rprocpub *rpub;
int s;
rpub = rp->r_pub;
/* Allow the service to run. */
if ((s = sys_privctl(rpub->endpoint, SYS_PRIV_ALLOW, NULL)) != OK) {
return kill_service(rp, "unable to allow the service to run",s);
}
/* Initialize service. */
if((s = init_service(rp, init_type)) != OK) {
return kill_service(rp, "unable to initialize service", s);
}
if(rs_verbose)
printf("RS: %s allowed to run\n", srv_to_string(rp));
return OK;
}
/*===========================================================================*
* start_service *
*===========================================================================*/
int start_service(rp)
struct rproc *rp;
{
/* Start a system service. */
int r, init_type;
struct rprocpub *rpub;
rpub = rp->r_pub;
/* Create and make active. */
r = create_service(rp);
if(r != OK) {
return r;
}
activate_service(rp, NULL);
/* Publish service properties. */
r = publish_service(rp);
if (r != OK) {
return r;
}
/* Run. */
init_type = SEF_INIT_FRESH;
r = run_service(rp, init_type);
if(r != OK) {
return r;
}
if(rs_verbose)
printf("RS: %s started with major %d\n", srv_to_string(rp),
rpub->dev_nr);
return OK;
}
/*===========================================================================*
* stop_service *
*===========================================================================*/
void stop_service(struct rproc *rp,int how)
{
struct rprocpub *rpub;
int signo;
rpub = rp->r_pub;
/* Try to stop the system service. First send a SIGTERM signal to ask the
* system service to terminate. If the service didn't install a signal
* handler, it will be killed. If it did and ignores the signal, we'll
* find out because we record the time here and send a SIGKILL.
*/
if(rs_verbose)
printf("RS: %s signaled with SIGTERM\n", srv_to_string(rp));
signo = rpub->endpoint != RS_PROC_NR ? SIGTERM : SIGHUP; /* SIGHUP for RS. */
rp->r_flags |= how; /* what to on exit? */
sys_kill(rpub->endpoint, signo); /* first try friendly */
getuptime(&rp->r_stop_tm); /* record current time */
}
/*===========================================================================*
* update_service *
*===========================================================================*/
int update_service(src_rpp, dst_rpp, swap_flag)
struct rproc **src_rpp;
struct rproc **dst_rpp;
int swap_flag;
{
/* Update an existing service. */
int r;
struct rproc *src_rp;
struct rproc *dst_rp;
struct rprocpub *src_rpub;
struct rprocpub *dst_rpub;
int pid;
endpoint_t endpoint;
src_rp = *src_rpp;
dst_rp = *dst_rpp;
src_rpub = src_rp->r_pub;
dst_rpub = dst_rp->r_pub;
if(rs_verbose)
printf("RS: %s updating into %s\n",
srv_to_string(src_rp), srv_to_string(dst_rp));
/* Swap the slots of the two processes when asked to. */
if(swap_flag == RS_SWAP) {
if((r = srv_update(src_rpub->endpoint, dst_rpub->endpoint)) != OK) {
return r;
}
}
/* Swap slots here as well. */
pid = src_rp->r_pid;
endpoint = src_rpub->endpoint;
swap_slot(&src_rp, &dst_rp);
/* Reassign pids and endpoints. */
src_rp->r_pid = dst_rp->r_pid;
src_rp->r_pub->endpoint = dst_rp->r_pub->endpoint;
rproc_ptr[_ENDPOINT_P(src_rp->r_pub->endpoint)] = src_rp;
dst_rp->r_pid = pid;
dst_rp->r_pub->endpoint = endpoint;
rproc_ptr[_ENDPOINT_P(dst_rp->r_pub->endpoint)] = dst_rp;
/* Adjust input pointers. */
*src_rpp = src_rp;
*dst_rpp = dst_rp;
/* Make the new version active. */
activate_service(dst_rp, src_rp);
if(rs_verbose)
printf("RS: %s updated into %s\n",
srv_to_string(src_rp), srv_to_string(dst_rp));
return OK;
}
/*===========================================================================*
* activate_service *
*===========================================================================*/
void activate_service(struct rproc *rp, struct rproc *ex_rp)
{
/* Activate a service instance and deactivate another one if requested. */
if(ex_rp && (ex_rp->r_flags & RS_ACTIVE) ) {
ex_rp->r_flags &= ~RS_ACTIVE;
if(rs_verbose)
printf("RS: %s becomes inactive\n", srv_to_string(ex_rp));
}
if(! (rp->r_flags & RS_ACTIVE) ) {
rp->r_flags |= RS_ACTIVE;
if(rs_verbose)
printf("RS: %s becomes active\n", srv_to_string(rp));
}
}
/*===========================================================================*
* reincarnate_service *
*===========================================================================*/
void reincarnate_service(struct rproc *rp)
{
/* Restart a service as if it were never started before. */
struct rprocpub *rpub;
int i;
rpub = rp->r_pub;
rp->r_flags &= RS_IN_USE;
rp->r_pid = -1;
rproc_ptr[_ENDPOINT_P(rpub->endpoint)] = NULL;
/* Restore original IRQ and I/O range tables in the priv struct. This is the
* only part of the privilege structure that can be modified by processes
* other than RS itself.
*/
rp->r_priv.s_nr_irq = rp->r_nr_irq;
for (i = 0; i < rp->r_nr_irq; i++)
rp->r_priv.s_irq_tab[i] = rp->r_irq_tab[i];
rp->r_priv.s_nr_io_range = rp->r_nr_io_range;
for (i = 0; i < rp->r_nr_io_range; i++)
rp->r_priv.s_io_tab[i] = rp->r_io_tab[i];
rp->r_old_rp = NULL;
rp->r_new_rp = NULL;
rp->r_prev_rp = NULL;
rp->r_next_rp = NULL;
start_service(rp);
}
/*===========================================================================*
* terminate_service *
*===========================================================================*/
void terminate_service(struct rproc *rp)
{
/* Handle a termination event for a system service. */
struct rproc **rps;
struct rprocpub *rpub;
int nr_rps;
int i, r;
rpub = rp->r_pub;
if(rs_verbose)
printf("RS: %s terminated\n", srv_to_string(rp));
/* Deal with failures during initialization. */
if(rp->r_flags & RS_INITIALIZING) {
if(rs_verbose)
printf("RS: service '%s' exited during initialization\n",
rpub->label);
rp->r_flags |= RS_EXITING; /* don't restart. */
/* If updating, rollback. */
if(rp->r_flags & RS_UPDATING) {
struct rproc *old_rp, *new_rp;
printf("RS: update failed: state transfer failed. Rolling back...\n");
new_rp = rp;
old_rp = new_rp->r_old_rp;
new_rp->r_flags &= ~RS_INITIALIZING;
r = update_service(&new_rp, &old_rp, RS_SWAP);
assert(r == OK); /* can't fail */
end_update(ERESTART, RS_REPLY);
return;
}
}
if (rp->r_flags & RS_EXITING) {
/* If a core system service is exiting, we are in trouble. */
if (rp->r_pub->sys_flags & SF_CORE_SRV && !shutting_down) {
printf("core system service died: %s\n", srv_to_string(rp));
_exit(1);
}
/* See if a late reply has to be sent. */
r = (rp->r_caller_request == RS_DOWN ? OK : EDEADEPT);
late_reply(rp, r);
/* Unpublish the service. */
unpublish_service(rp);
/* Cleanup all the instances of the service. */
get_service_instances(rp, &rps, &nr_rps);
for(i=0;i<nr_rps;i++) {
cleanup_service(rps[i]);
}
/* If the service is reincarnating, its slot has not been cleaned up.
* Check for this flag now, and attempt to start the service again.
* If this fails, start_service() itself will perform cleanup.
*/
if (rp->r_flags & RS_REINCARNATE) {
reincarnate_service(rp);
}
}
else if(rp->r_flags & RS_REFRESHING) {
/* Restart service. */
restart_service(rp);
}
else {
/* If an update is in progress, end it. The old version
* that just exited will continue executing.
*/
if(rp->r_flags & RS_UPDATING) {
end_update(ERESTART, RS_DONTREPLY);
}
/* Determine what to do. If this is the first unexpected
* exit, immediately restart this service. Otherwise use
* a binary exponential backoff.
*/
if (rp->r_restarts > 0) {
rp->r_backoff = 1 << MIN(rp->r_restarts,(BACKOFF_BITS-2));
rp->r_backoff = MIN(rp->r_backoff,MAX_BACKOFF);
if ((rpub->sys_flags & SF_USE_COPY) && rp->r_backoff > 1)
rp->r_backoff= 1;
return;
}
/* Restart service. */
restart_service(rp);
}
}
/*===========================================================================*
* run_script *
*===========================================================================*/
static int run_script(struct rproc *rp)
{
int r, endpoint;
pid_t pid;
char *reason;
char incarnation_str[20]; /* Enough for a counter? */
char *envp[1] = { NULL };
struct rprocpub *rpub;
rpub = rp->r_pub;
if (rp->r_flags & RS_REFRESHING)
reason= "restart";
else if (rp->r_flags & RS_NOPINGREPLY)
reason= "no-heartbeat";
else reason= "terminated";
sprintf(incarnation_str, "%d", rp->r_restarts);
if(rs_verbose) {
printf("RS: %s:\n", srv_to_string(rp));
printf("RS: calling script '%s'\n", rp->r_script);
printf("RS: reason: '%s'\n", reason);
printf("RS: incarnation: '%s'\n", incarnation_str);
}
pid= fork();
switch(pid)
{
case -1:
return kill_service(rp, "unable to fork script", errno);
case 0:
execle(rp->r_script, rp->r_script, rpub->label, reason,
incarnation_str, (char*) NULL, envp);
printf("RS: run_script: execl '%s' failed: %s\n",
rp->r_script, strerror(errno));
exit(1);
default:
/* Set the privilege structure for the child process. */
endpoint = getnprocnr(pid);
if ((r = sys_privctl(endpoint, SYS_PRIV_SET_USER, NULL))
!= OK) {
return kill_service(rp,"can't set script privileges",r);
}
/* Allow the script to run. */
if ((r = sys_privctl(endpoint, SYS_PRIV_ALLOW, NULL)) != OK) {
return kill_service(rp,"can't let the script run",r);
}
/* Pin RS memory again after fork()ing. */
vm_memctl(RS_PROC_NR, VM_RS_MEM_PIN);
}
return OK;
}
/*===========================================================================*
* restart_service *
*===========================================================================*/
void restart_service(struct rproc *rp)
{
/* Restart service via a recovery script or directly. */
struct rproc *replica_rp;
int r;
/* See if a late reply has to be sent. */
late_reply(rp, OK);
/* This hack disables restarting of file servers, which at the moment always
* cause VFS to hang indefinitely. As soon as VFS no longer blocks on calls
* to file servers, this exception can be removed again.
*/
if (!strncmp(rp->r_pub->label, "fs_", 3)) {
kill_service(rp, "file servers cannot be restarted yet", ENOSYS);
return;
}
/* Run a recovery script if available. */
if (rp->r_script[0] != '\0') {
run_script(rp);
return;
}
/* Restart directly. We need a replica if not already available. */
if(rp->r_next_rp == NULL) {
/* Create the replica. */
r = clone_service(rp, RST_SYS_PROC);
if(r != OK) {
kill_service(rp, "unable to clone service", r);
return;
}
}
replica_rp = rp->r_next_rp;
/* Update the service into the replica. */
r = update_service(&rp, &replica_rp, RS_SWAP);
if(r != OK) {
kill_service(rp, "unable to update into new replica", r);
return;
}
/* Let the new replica run. */
r = run_service(replica_rp, SEF_INIT_RESTART);
if(r != OK) {
kill_service(rp, "unable to let the replica run", r);
return;
}
if(rs_verbose)
printf("RS: %s restarted into %s\n",
srv_to_string(rp), srv_to_string(replica_rp));
}
/*===========================================================================*
* inherit_service_defaults *
*===========================================================================*/
void inherit_service_defaults(def_rp, rp)
struct rproc *def_rp;
struct rproc *rp;
{
struct rprocpub *def_rpub;
struct rprocpub *rpub;
def_rpub = def_rp->r_pub;
rpub = rp->r_pub;
/* Device and PCI settings. These properties cannot change. */
rpub->dev_flags = def_rpub->dev_flags;
rpub->dev_nr = def_rpub->dev_nr;
rpub->dev_style = def_rpub->dev_style;
rpub->dev_style2 = def_rpub->dev_style2;
rpub->pci_acl = def_rpub->pci_acl;
/* Immutable system and privilege flags. */
rpub->sys_flags &= ~IMM_SF;
rpub->sys_flags |= (def_rpub->sys_flags & IMM_SF);
rp->r_priv.s_flags &= ~IMM_F;
rp->r_priv.s_flags |= (def_rp->r_priv.s_flags & IMM_F);
/* Allowed traps. They cannot change. */
rp->r_priv.s_trap_mask = def_rp->r_priv.s_trap_mask;
}
/*===========================================================================*
* get_service_instances *
*===========================================================================*/
void get_service_instances(rp, rps, length)
struct rproc *rp;
struct rproc ***rps;
int *length;
{
/* Retrieve all the service instances of a given service. */
static struct rproc *instances[5];
int nr_instances;
nr_instances = 0;
instances[nr_instances++] = rp;
if(rp->r_prev_rp) instances[nr_instances++] = rp->r_prev_rp;
if(rp->r_next_rp) instances[nr_instances++] = rp->r_next_rp;
if(rp->r_old_rp) instances[nr_instances++] = rp->r_old_rp;
if(rp->r_new_rp) instances[nr_instances++] = rp->r_new_rp;
*rps = instances;
*length = nr_instances;
}
/*===========================================================================*
* share_exec *
*===========================================================================*/
void share_exec(rp_dst, rp_src)
struct rproc *rp_dst, *rp_src;
{
struct rprocpub *rpub_src;
struct rprocpub *rpub_dst;
rpub_src = rp_src->r_pub;
rpub_dst = rp_dst->r_pub;
if(rs_verbose)
printf("RS: %s shares exec image with %s\n",
srv_to_string(rp_dst), srv_to_string(rp_src));
/* Share exec image from rp_src to rp_dst. */
rp_dst->r_exec_len = rp_src->r_exec_len;
rp_dst->r_exec = rp_src->r_exec;
}
/*===========================================================================*
* read_exec *
*===========================================================================*/
int read_exec(rp)
struct rproc *rp;
{
int e, r, fd;
char *e_name;
struct stat sb;
e_name= rp->r_argv[0];
if(rs_verbose)
printf("RS: service '%s' reads exec image from: %s\n", rp->r_pub->label,
e_name);
r= stat(e_name, &sb);
if (r != 0)
return -errno;
fd= open(e_name, O_RDONLY);
if (fd == -1)
return -errno;
rp->r_exec_len= sb.st_size;
rp->r_exec= malloc(rp->r_exec_len);
if (rp->r_exec == NULL)
{
printf("RS: read_exec: unable to allocate %d bytes\n",
rp->r_exec_len);
close(fd);
return ENOMEM;
}
r= read(fd, rp->r_exec, rp->r_exec_len);
e= errno;
close(fd);
if (r == rp->r_exec_len)
return OK;
printf("RS: read_exec: read failed %d, errno %d\n", r, e);
free_exec(rp);
if (r >= 0)
return EIO;
else
return -e;
}
/*===========================================================================*
* free_exec *
*===========================================================================*/
void free_exec(rp)
struct rproc *rp;
{
/* Free an exec image. */
int slot_nr, has_shared_exec;
struct rproc *other_rp;
/* Search for some other slot sharing the same exec image. */
has_shared_exec = FALSE;
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
other_rp = &rproc[slot_nr]; /* get pointer to slot */
if (other_rp->r_flags & RS_IN_USE && other_rp != rp
&& other_rp->r_exec == rp->r_exec) { /* found! */
has_shared_exec = TRUE;
break;
}
}
/* If nobody uses our copy of the exec image, we can try to get rid of it. */
if(!has_shared_exec) {
if(rs_verbose)
printf("RS: %s frees exec image\n", srv_to_string(rp));
free(rp->r_exec);
}
else {
if(rs_verbose)
printf("RS: %s no longer sharing exec image with %s\n",
srv_to_string(rp), srv_to_string(other_rp));
}
rp->r_exec = NULL;
rp->r_exec_len = 0;
}
/*===========================================================================*
* edit_slot *
*===========================================================================*/
int edit_slot(rp, rs_start, source)
struct rproc *rp;
struct rs_start *rs_start;
endpoint_t source;
{
/* Edit a given slot to override existing settings. */
struct rprocpub *rpub;
char *label;
int len;
int s, i;
int basic_kc[] = { SYS_BASIC_CALLS, NULL_C };
int basic_vmc[] = { VM_BASIC_CALLS, NULL_C };
rpub = rp->r_pub;
/* Update IPC target list. */
if (rs_start->rss_ipclen==0 || rs_start->rss_ipclen+1>sizeof(rp->r_ipc_list)){
printf("RS: edit_slot: ipc list empty or long for '%s'\n", rpub->label);
return EINVAL;
}
s=sys_datacopy(source, (vir_bytes) rs_start->rss_ipc,
SELF, (vir_bytes) rp->r_ipc_list, rs_start->rss_ipclen);
if (s != OK) return(s);
rp->r_ipc_list[rs_start->rss_ipclen]= '\0';
/* Update IRQs. */
if(rs_start->rss_nr_irq == RSS_IRQ_ALL) {
rs_start->rss_nr_irq = 0;
}
else {
rp->r_priv.s_flags |= CHECK_IRQ;
}
if (rs_start->rss_nr_irq > NR_IRQ) {
printf("RS: edit_slot: too many IRQs requested\n");
return EINVAL;
}
rp->r_nr_irq= rp->r_priv.s_nr_irq= rs_start->rss_nr_irq;
for (i= 0; i<rp->r_priv.s_nr_irq; i++) {
rp->r_irq_tab[i]= rp->r_priv.s_irq_tab[i]= rs_start->rss_irq[i];
if(rs_verbose)
printf("RS: edit_slot: IRQ %d\n", rp->r_priv.s_irq_tab[i]);
}
/* Update I/O ranges. */
if(rs_start->rss_nr_io == RSS_IO_ALL) {
rs_start->rss_nr_io = 0;
}
else {
rp->r_priv.s_flags |= CHECK_IO_PORT;
}
if (rs_start->rss_nr_io > NR_IO_RANGE) {
printf("RS: edit_slot: too many I/O ranges requested\n");
return EINVAL;
}
rp->r_nr_io_range= rp->r_priv.s_nr_io_range= rs_start->rss_nr_io;
for (i= 0; i<rp->r_priv.s_nr_io_range; i++) {
rp->r_priv.s_io_tab[i].ior_base= rs_start->rss_io[i].base;
rp->r_priv.s_io_tab[i].ior_limit=
rs_start->rss_io[i].base+rs_start->rss_io[i].len-1;
rp->r_io_tab[i] = rp->r_priv.s_io_tab[i];
if(rs_verbose)
printf("RS: edit_slot: I/O [%x..%x]\n",
rp->r_priv.s_io_tab[i].ior_base,
rp->r_priv.s_io_tab[i].ior_limit);
}
/* Update kernel call mask. Inherit basic kernel calls when asked to. */
memcpy(rp->r_priv.s_k_call_mask, rs_start->rss_system,
sizeof(rp->r_priv.s_k_call_mask));
if(rs_start->rss_flags & RSS_SYS_BASIC_CALLS) {
fill_call_mask(basic_kc, NR_SYS_CALLS,
rp->r_priv.s_k_call_mask, KERNEL_CALL, FALSE);
}
/* Update VM call mask. Inherit basic VM calls. */
memcpy(rpub->vm_call_mask, rs_start->rss_vm,
sizeof(rpub->vm_call_mask));
if(rs_start->rss_flags & RSS_VM_BASIC_CALLS) {
fill_call_mask(basic_vmc, NR_VM_CALLS,
rpub->vm_call_mask, VM_RQ_BASE, FALSE);
}
/* Update control labels. */
if(rs_start->rss_nr_control > 0) {
int i, s;
if (rs_start->rss_nr_control > RS_NR_CONTROL) {
printf("RS: edit_slot: too many control labels\n");
return EINVAL;
}
for (i=0; i<rs_start->rss_nr_control; i++) {
s = copy_label(source, rs_start->rss_control[i].l_addr,
rs_start->rss_control[i].l_len, rp->r_control[i],
sizeof(rp->r_control[i]));
if(s != OK)
return s;
}
rp->r_nr_control = rs_start->rss_nr_control;
if (rs_verbose) {
printf("RS: edit_slot: control labels:");
for (i=0; i<rp->r_nr_control; i++)
printf(" %s", rp->r_control[i]);
printf("\n");
}
}
/* Update signal manager. */
rp->r_priv.s_sig_mgr = rs_start->rss_sigmgr;
/* Update scheduling properties if possible. */
if(rp->r_scheduler != NONE) {
rp->r_scheduler = rs_start->rss_scheduler;
rp->r_priority = rs_start->rss_priority;
rp->r_quantum = rs_start->rss_quantum;
rp->r_cpu = rs_start->rss_cpu;
}
/* Update command and arguments. */
if (rs_start->rss_cmdlen > MAX_COMMAND_LEN-1) return(E2BIG);
s=sys_datacopy(source, (vir_bytes) rs_start->rss_cmd,
SELF, (vir_bytes) rp->r_cmd, rs_start->rss_cmdlen);
if (s != OK) return(s);
rp->r_cmd[rs_start->rss_cmdlen] = '\0'; /* ensure it is terminated */
if (rp->r_cmd[0] != '/') return(EINVAL); /* insist on absolute path */
/* Build cmd dependencies: argv and program name. */
build_cmd_dep(rp);
/* Update label if not already set. */
if(!strcmp(rpub->label, "")) {
if(rs_start->rss_label.l_len > 0) {
/* RS_UP caller has supplied a custom label for this service. */
int s = copy_label(source, rs_start->rss_label.l_addr,
rs_start->rss_label.l_len, rpub->label, sizeof(rpub->label));
if(s != OK)
return s;
if(rs_verbose)
printf("RS: edit_slot: using label (custom) '%s'\n", rpub->label);
} else {
/* Default label for the service. */
label = rpub->proc_name;
len= strlen(label);
memcpy(rpub->label, label, len);
rpub->label[len]= '\0';
if(rs_verbose)
printf("RS: edit_slot: using label (from proc_name) '%s'\n",
rpub->label);
}
}
/* Update recovery script. */
if (rs_start->rss_scriptlen > MAX_SCRIPT_LEN-1) return(E2BIG);
if (rs_start->rss_script != NULL && !(rpub->sys_flags & SF_CORE_SRV)) {
s=sys_datacopy(source, (vir_bytes) rs_start->rss_script,
SELF, (vir_bytes) rp->r_script, rs_start->rss_scriptlen);
if (s != OK) return(s);
rp->r_script[rs_start->rss_scriptlen] = '\0';
}
/* Update system flags and in-memory copy. */
if ((rs_start->rss_flags & RSS_COPY) && !(rpub->sys_flags & SF_USE_COPY)) {
int exst_cpy;
struct rproc *rp2;
struct rprocpub *rpub2;
exst_cpy = 0;
if(rs_start->rss_flags & RSS_REUSE) {
int i;
for(i = 0; i < NR_SYS_PROCS; i++) {
rp2 = &rproc[i];
if (!(rp2->r_flags & RS_IN_USE)) {
continue;
}
rpub2 = rproc[i].r_pub;
if(strcmp(rpub->proc_name, rpub2->proc_name) == 0 &&
(rpub2->sys_flags & SF_USE_COPY)) {
/* We have found the same binary that's
* already been copied */
exst_cpy = 1;
break;
}
}
}
s = OK;
if(!exst_cpy)
s = read_exec(rp);
else
share_exec(rp, rp2);
if (s != OK)
return s;
rpub->sys_flags |= SF_USE_COPY;
}
if (rs_start->rss_flags & RSS_REPLICA) {
rpub->sys_flags |= SF_USE_REPL;
}
/* Update period. */
if(rpub->endpoint != RS_PROC_NR) {
rp->r_period = rs_start->rss_period;
}
/* (Re)initialize privilege settings. */
init_privs(rp, &rp->r_priv);
return OK;
}
/*===========================================================================*
* init_slot *
*===========================================================================*/
int init_slot(rp, rs_start, source)
struct rproc *rp;
struct rs_start *rs_start;
endpoint_t source;
{
/* Initialize a slot as requested by the client. */
struct rprocpub *rpub;
int i;
rpub = rp->r_pub;
/* All dynamically created services get the same sys and privilege flags, and
* allowed traps. Other privilege settings can be specified at runtime. The
* privilege id is dynamically allocated by the kernel.
*/
rpub->sys_flags = DSRV_SF; /* system flags */
rp->r_priv.s_flags = DSRV_F; /* privilege flags */
rp->r_priv.s_trap_mask = DSRV_T; /* allowed traps */
rp->r_priv.s_bak_sig_mgr = NONE; /* backup signal manager */
/* Initialize uid. */
rp->r_uid= rs_start->rss_uid;
/* Initialize device driver settings. */
rpub->dev_flags = DSRV_DF;
rpub->dev_nr = rs_start->rss_major;
rpub->dev_style = rs_start->rss_dev_style;
rpub->devman_id = rs_start->devman_id;
if(rpub->dev_nr && !IS_DEV_STYLE(rs_start->rss_dev_style)) {
printf("RS: init_slot: bad device style\n");
return EINVAL;
}
rpub->dev_style2 = STYLE_NDEV;
/* Initialize pci settings. */
if (rs_start->rss_nr_pci_id > RS_NR_PCI_DEVICE) {
printf("RS: init_slot: too many PCI device IDs\n");
return EINVAL;
}
rpub->pci_acl.rsp_nr_device = rs_start->rss_nr_pci_id;
for (i= 0; i<rpub->pci_acl.rsp_nr_device; i++) {
rpub->pci_acl.rsp_device[i].vid= rs_start->rss_pci_id[i].vid;
rpub->pci_acl.rsp_device[i].did= rs_start->rss_pci_id[i].did;
if(rs_verbose)
printf("RS: init_slot: PCI %04x/%04x\n",
rpub->pci_acl.rsp_device[i].vid,
rpub->pci_acl.rsp_device[i].did);
}
if (rs_start->rss_nr_pci_class > RS_NR_PCI_CLASS) {
printf("RS: init_slot: too many PCI class IDs\n");
return EINVAL;
}
rpub->pci_acl.rsp_nr_class= rs_start->rss_nr_pci_class;
for (i= 0; i<rpub->pci_acl.rsp_nr_class; i++) {
rpub->pci_acl.rsp_class[i].pciclass=rs_start->rss_pci_class[i].pciclass;
rpub->pci_acl.rsp_class[i].mask= rs_start->rss_pci_class[i].mask;
if(rs_verbose)
printf("RS: init_slot: PCI class %06x mask %06x\n",
(unsigned int) rpub->pci_acl.rsp_class[i].pciclass,
(unsigned int) rpub->pci_acl.rsp_class[i].mask);
}
/* Initialize some fields. */
rp->r_restarts = 0; /* no restarts yet */
rp->r_old_rp = NULL; /* no old version yet */
rp->r_new_rp = NULL; /* no new version yet */
rp->r_prev_rp = NULL; /* no prev replica yet */
rp->r_next_rp = NULL; /* no next replica yet */
rp->r_exec = NULL; /* no in-memory copy yet */
rp->r_exec_len = 0;
rp->r_script[0]= '\0'; /* no recovery script yet */
rpub->label[0]= '\0'; /* no label yet */
rp->r_scheduler = -1; /* no scheduler yet */
rp->r_priv.s_sig_mgr = -1; /* no signal manager yet */
/* Initialize editable slot settings. */
return edit_slot(rp, rs_start, source);
}
/*===========================================================================*
* clone_slot *
*===========================================================================*/
int clone_slot(rp, clone_rpp)
struct rproc *rp;
struct rproc **clone_rpp;
{
int r;
struct rproc *clone_rp;
struct rprocpub *rpub, *clone_rpub;
/* Allocate a system service slot for the clone. */
r = alloc_slot(&clone_rp);
if(r != OK) {
printf("RS: clone_slot: unable to allocate a new slot: %d\n", r);
return r;
}
rpub = rp->r_pub;
clone_rpub = clone_rp->r_pub;
/* Synch the privilege structure of the source with the kernel. */
if ((r = sys_getpriv(&(rp->r_priv), rpub->endpoint)) != OK) {
panic("unable to synch privilege structure: %d", r);
}
/* Shallow copy. */
*clone_rp = *rp;
*clone_rpub = *rpub;
/* Deep copy. */
clone_rp->r_flags &= ~RS_ACTIVE; /* the clone is not active yet */
clone_rp->r_pid = -1; /* no pid yet */
clone_rpub->endpoint = -1; /* no endpoint yet */
clone_rp->r_pub = clone_rpub; /* restore pointer to public entry */
build_cmd_dep(clone_rp); /* rebuild cmd dependencies */
if(clone_rpub->sys_flags & SF_USE_COPY) {
share_exec(clone_rp, rp); /* share exec image */
}
clone_rp->r_old_rp = NULL; /* no old version yet */
clone_rp->r_new_rp = NULL; /* no new version yet */
clone_rp->r_prev_rp = NULL; /* no prev replica yet */
clone_rp->r_next_rp = NULL; /* no next replica yet */
/* Force dynamic privilege id. */
clone_rp->r_priv.s_flags |= DYN_PRIV_ID;
/* Clear instance flags. */
clone_rp->r_priv.s_flags &= ~(LU_SYS_PROC | RST_SYS_PROC);
*clone_rpp = clone_rp;
return OK;
}
/*===========================================================================*
* swap_slot_pointer *
*===========================================================================*/
static void swap_slot_pointer(struct rproc **rpp, struct rproc *src_rp,
struct rproc *dst_rp)
{
if(*rpp == src_rp) {
*rpp = dst_rp;
}
else if(*rpp == dst_rp) {
*rpp = src_rp;
}
}
/*===========================================================================*
* swap_slot *
*===========================================================================*/
void swap_slot(src_rpp, dst_rpp)
struct rproc **src_rpp;
struct rproc **dst_rpp;
{
/* Swap two service slots. */
struct rproc *src_rp;
struct rproc *dst_rp;
struct rprocpub *src_rpub;
struct rprocpub *dst_rpub;
struct rproc orig_src_rproc, orig_dst_rproc;
struct rprocpub orig_src_rprocpub, orig_dst_rprocpub;
src_rp = *src_rpp;
dst_rp = *dst_rpp;
src_rpub = src_rp->r_pub;
dst_rpub = dst_rp->r_pub;
/* Save existing data first. */
orig_src_rproc = *src_rp;
orig_src_rprocpub = *src_rpub;
orig_dst_rproc = *dst_rp;
orig_dst_rprocpub = *dst_rpub;
/* Swap slots. */
*src_rp = orig_dst_rproc;
*src_rpub = orig_dst_rprocpub;
*dst_rp = orig_src_rproc;
*dst_rpub = orig_src_rprocpub;
/* Restore public entries. */
src_rp->r_pub = orig_src_rproc.r_pub;
dst_rp->r_pub = orig_dst_rproc.r_pub;
/* Rebuild command dependencies. */
build_cmd_dep(src_rp);
build_cmd_dep(dst_rp);
/* Swap local slot pointers. */
swap_slot_pointer(&src_rp->r_prev_rp, src_rp, dst_rp);
swap_slot_pointer(&src_rp->r_next_rp, src_rp, dst_rp);
swap_slot_pointer(&src_rp->r_old_rp, src_rp, dst_rp);
swap_slot_pointer(&src_rp->r_new_rp, src_rp, dst_rp);
swap_slot_pointer(&dst_rp->r_prev_rp, src_rp, dst_rp);
swap_slot_pointer(&dst_rp->r_next_rp, src_rp, dst_rp);
swap_slot_pointer(&dst_rp->r_old_rp, src_rp, dst_rp);
swap_slot_pointer(&dst_rp->r_new_rp, src_rp, dst_rp);
/* Swap global slot pointers. */
swap_slot_pointer(&rupdate.rp, src_rp, dst_rp);
swap_slot_pointer(&rproc_ptr[_ENDPOINT_P(src_rp->r_pub->endpoint)],
src_rp, dst_rp);
swap_slot_pointer(&rproc_ptr[_ENDPOINT_P(dst_rp->r_pub->endpoint)],
src_rp, dst_rp);
/* Adjust input pointers. */
*src_rpp = dst_rp;
*dst_rpp = src_rp;
}
/*===========================================================================*
* lookup_slot_by_label *
*===========================================================================*/
struct rproc* lookup_slot_by_label(char *label)
{
/* Lookup a service slot matching the given label. */
int slot_nr;
struct rproc *rp;
struct rprocpub *rpub;
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
rp = &rproc[slot_nr];
if (!(rp->r_flags & RS_ACTIVE)) {
continue;
}
rpub = rp->r_pub;
if (strcmp(rpub->label, label) == 0) {
return rp;
}
}
return NULL;
}
/*===========================================================================*
* lookup_slot_by_pid *
*===========================================================================*/
struct rproc* lookup_slot_by_pid(pid_t pid)
{
/* Lookup a service slot matching the given pid. */
int slot_nr;
struct rproc *rp;
if(pid < 0) {
return NULL;
}
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
rp = &rproc[slot_nr];
if (!(rp->r_flags & RS_IN_USE)) {
continue;
}
if (rp->r_pid == pid) {
return rp;
}
}
return NULL;
}
/*===========================================================================*
* lookup_slot_by_dev_nr *
*===========================================================================*/
struct rproc* lookup_slot_by_dev_nr(dev_t dev_nr)
{
/* Lookup a service slot matching the given device number. */
int slot_nr;
struct rproc *rp;
struct rprocpub *rpub;
if(dev_nr <= 0) {
return NULL;
}
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
rp = &rproc[slot_nr];
rpub = rp->r_pub;
if (!(rp->r_flags & RS_IN_USE)) {
continue;
}
if (rpub->dev_nr == dev_nr) {
return rp;
}
}
return NULL;
}
/*===========================================================================*
* lookup_slot_by_flags *
*===========================================================================*/
struct rproc* lookup_slot_by_flags(int flags)
{
/* Lookup a service slot matching the given flags. */
int slot_nr;
struct rproc *rp;
if(!flags) {
return NULL;
}
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
rp = &rproc[slot_nr];
if (!(rp->r_flags & RS_IN_USE)) {
continue;
}
if (rp->r_flags & flags) {
return rp;
}
}
return NULL;
}
/*===========================================================================*
* alloc_slot *
*===========================================================================*/
int alloc_slot(rpp)
struct rproc **rpp;
{
/* Alloc a new system service slot. */
int slot_nr;
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
*rpp = &rproc[slot_nr]; /* get pointer to slot */
if (!((*rpp)->r_flags & RS_IN_USE)) /* check if available */
break;
}
if (slot_nr >= NR_SYS_PROCS) {
return ENOMEM;
}
return OK;
}
/*===========================================================================*
* free_slot *
*===========================================================================*/
void free_slot(rp)
struct rproc *rp;
{
/* Free a system service slot. */
struct rprocpub *rpub;
rpub = rp->r_pub;
/* Send a late reply if there is any pending. */
late_reply(rp, OK);
/* Free memory if necessary. */
if(rpub->sys_flags & SF_USE_COPY) {
free_exec(rp);
}
/* Mark slot as no longer in use.. */
rp->r_flags = 0;
rp->r_pid = -1;
rpub->in_use = FALSE;
rproc_ptr[_ENDPOINT_P(rpub->endpoint)] = NULL;
}
/*===========================================================================*
* get_next_name *
*===========================================================================*/
static char *get_next_name(ptr, name, caller_label)
char *ptr;
char *name;
char *caller_label;
{
/* Get the next name from the list of (IPC) program names.
*/
char *p, *q;
size_t len;
for (p= ptr; p[0] != '\0'; p= q)
{
/* Skip leading space */
while (p[0] != '\0' && isspace((unsigned char)p[0]))
p++;
/* Find start of next word */
q= p;
while (q[0] != '\0' && !isspace((unsigned char)q[0]))
q++;
if (q == p)
continue;
len= q-p;
if (len > RS_MAX_LABEL_LEN)
{
printf(
"rs:get_next_name: bad ipc list entry '%.*s' for %s: too long\n",
len, p, caller_label);
continue;
}
memcpy(name, p, len);
name[len]= '\0';
return q; /* found another */
}
return NULL; /* done */
}
/*===========================================================================*
* add_forward_ipc *
*===========================================================================*/
void add_forward_ipc(rp, privp)
struct rproc *rp;
struct priv *privp;
{
/* Add IPC send permissions to a process based on that process's IPC
* list.
*/
char name[RS_MAX_LABEL_LEN+1], *p;
struct rproc *rrp;
endpoint_t endpoint;
int r;
int priv_id;
struct priv priv;
struct rprocpub *rpub;
rpub = rp->r_pub;
p = rp->r_ipc_list;
while ((p = get_next_name(p, name, rpub->label)) != NULL) {
if (strcmp(name, "SYSTEM") == 0)
endpoint= SYSTEM;
else if (strcmp(name, "USER") == 0)
endpoint= INIT_PROC_NR; /* all user procs */
else
{
/* Set a privilege bit for every process matching the
* given process name. It is perfectly fine if this
* loop does not find any matches, as the target
* process(es) may not have been started yet. See
* add_backward_ipc() below.
*/
for (rrp=BEG_RPROC_ADDR; rrp<END_RPROC_ADDR; rrp++) {
if (!(rrp->r_flags & RS_IN_USE))
continue;
if (!strcmp(rrp->r_pub->proc_name, name)) {
#if PRIV_DEBUG
printf(" RS: add_forward_ipc: setting"
" sendto bit for %d...\n",
rrp->r_pub->endpoint);
#endif
priv_id= rrp->r_priv.s_id;
set_sys_bit(privp->s_ipc_to, priv_id);
}
}
continue;
}
/* This code only applies to the exception cases. */
if ((r = sys_getpriv(&priv, endpoint)) < 0)
{
printf(
"add_forward_ipc: unable to get priv_id for '%s': %d\n",
name, r);
continue;
}
#if PRIV_DEBUG
printf(" RS: add_forward_ipc: setting sendto bit for %d...\n",
endpoint);
#endif
priv_id= priv.s_id;
set_sys_bit(privp->s_ipc_to, priv_id);
}
}
/*===========================================================================*
* add_backward_ipc *
*===========================================================================*/
void add_backward_ipc(rp, privp)
struct rproc *rp;
struct priv *privp;
{
/* Add IPC send permissions to a process based on other processes' IPC
* lists. This is enough to allow each such two processes to talk to
* each other, as the kernel guarantees send mask symmetry. We need to
* add these permissions now because the current process may not yet
* have existed at the time that the other process was initialized.
*/
char name[RS_MAX_LABEL_LEN+1], *p;
struct rproc *rrp;
struct rprocpub *rrpub;
char *proc_name;
int priv_id, is_ipc_all, is_ipc_all_sys;
proc_name = rp->r_pub->proc_name;
for (rrp=BEG_RPROC_ADDR; rrp<END_RPROC_ADDR; rrp++) {
if (!(rrp->r_flags & RS_IN_USE))
continue;
if (!rrp->r_ipc_list[0])
continue;
/* If the process being checked is set to allow IPC to all
* other processes, or for all other system processes and the
* target process is a system process, add a permission bit.
*/
rrpub = rrp->r_pub;
is_ipc_all = !strcmp(rrp->r_ipc_list, RSS_IPC_ALL);
is_ipc_all_sys = !strcmp(rrp->r_ipc_list, RSS_IPC_ALL_SYS);
if (is_ipc_all ||
(is_ipc_all_sys && (privp->s_flags & SYS_PROC))) {
#if PRIV_DEBUG
printf(" RS: add_backward_ipc: setting sendto bit "
"for %d...\n", rrpub->endpoint);
#endif
priv_id= rrp->r_priv.s_id;
set_sys_bit(privp->s_ipc_to, priv_id);
continue;
}
/* An IPC target list was provided for the process being
* checked here. Make sure that the name of the new process
* is in that process's list. There may be multiple matches.
*/
p = rrp->r_ipc_list;
while ((p = get_next_name(p, name, rrpub->label)) != NULL) {
if (!strcmp(proc_name, name)) {
#if PRIV_DEBUG
printf(" RS: add_backward_ipc: setting sendto"
" bit for %d...\n",
rrpub->endpoint);
#endif
priv_id= rrp->r_priv.s_id;
set_sys_bit(privp->s_ipc_to, priv_id);
}
}
}
}
/*===========================================================================*
* init_privs *
*===========================================================================*/
void init_privs(rp, privp)
struct rproc *rp;
struct priv *privp;
{
int i;
int is_ipc_all, is_ipc_all_sys;
/* Clear s_ipc_to */
fill_send_mask(&privp->s_ipc_to, FALSE);
is_ipc_all = !strcmp(rp->r_ipc_list, RSS_IPC_ALL);
is_ipc_all_sys = !strcmp(rp->r_ipc_list, RSS_IPC_ALL_SYS);
#if PRIV_DEBUG
printf(" RS: init_privs: ipc list is '%s'...\n", rp->r_ipc_list);
#endif
if (!is_ipc_all && !is_ipc_all_sys)
{
add_forward_ipc(rp, privp);
add_backward_ipc(rp, privp);
}
else
{
for (i= 0; i<NR_SYS_PROCS; i++)
{
if (is_ipc_all || i != USER_PRIV_ID)
set_sys_bit(privp->s_ipc_to, i);
}
}
}
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