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/*
htop - linux/LibNl.c
(C) 2024 htop dev team
Released under the GNU GPLv2+, see the COPYING file
in the source distribution for its full text.
*/
#include "config.h" // IWYU pragma: keep
#ifndef HAVE_DELAYACCT
#error Compiling this file requires HAVE_DELAYACCT
#endif
#include "linux/LibNl.h"
#include <dlfcn.h>
#include <linux/netlink.h>
#include <linux/taskstats.h>
#include <netlink/attr.h>
#include <netlink/handlers.h>
#include <netlink/msg.h>
static void* libnlHandle;
static void* libnlGenlHandle;
static void (*sym_nl_close)(struct nl_sock*);
static int (*sym_nl_connect)(struct nl_sock*, int);
static int (*sym_nl_recvmsgs_default)(struct nl_sock*);
static int (*sym_nl_send_sync)(struct nl_sock*, struct nl_msg*);
static struct nl_sock* (*sym_nl_socket_alloc)(void);
static void (*sym_nl_socket_free)(struct nl_sock*);
static int (*sym_nl_socket_modify_cb)(struct nl_sock*, enum nl_cb_type, enum nl_cb_kind, nl_recvmsg_msg_cb_t, void*);
static void* (*sym_nla_data)(const struct nlattr*);
static struct nlattr* (*sym_nla_next)(const struct nlattr*, int*);
static int (*sym_nla_put_u32)(struct nl_msg*, int, uint32_t);
static struct nl_msg* (*sym_nlmsg_alloc)(void);
static struct nlmsghdr* (*sym_nlmsg_hdr)(struct nl_msg*);
static void (*sym_nlmsg_free)(struct nl_msg*);
static int (*sym_genl_ctrl_resolve)(struct nl_sock*, const char*);
static int (*sym_genlmsg_parse)(struct nlmsghdr*, int, struct nlattr**, int, const struct nla_policy*);
static void* (*sym_genlmsg_put)(struct nl_msg*, uint32_t, uint32_t, int, int, int, uint8_t, uint8_t);
static void unload_libnl(void) {
sym_nl_close = NULL;
sym_nl_connect = NULL;
sym_nl_recvmsgs_default = NULL;
sym_nl_send_sync = NULL;
sym_nl_socket_alloc = NULL;
sym_nl_socket_free = NULL;
sym_nl_socket_modify_cb = NULL;
sym_nla_data = NULL;
sym_nla_next = NULL;
sym_nla_put_u32 = NULL;
sym_nlmsg_alloc = NULL;
sym_nlmsg_free = NULL;
sym_nlmsg_hdr = NULL;
sym_genl_ctrl_resolve = NULL;
sym_genlmsg_parse = NULL;
sym_genlmsg_put = NULL;
if (libnlGenlHandle) {
dlclose(libnlGenlHandle);
libnlGenlHandle = NULL;
}
if (libnlHandle) {
dlclose(libnlHandle);
libnlHandle = NULL;
}
}
static int load_libnl(void) {
if (libnlHandle && libnlGenlHandle)
return 0;
libnlHandle = dlopen("libnl-3.so", RTLD_LAZY);
if (!libnlHandle) {
libnlHandle = dlopen("libnl-3.so.200", RTLD_LAZY);
if (!libnlHandle) {
goto dlfailure;
}
}
libnlGenlHandle = dlopen("libnl-genl-3.so", RTLD_LAZY);
if (!libnlGenlHandle) {
libnlGenlHandle = dlopen("libnl-genl-3.so.200", RTLD_LAZY);
if (!libnlGenlHandle) {
goto dlfailure;
}
}
/* Clear any errors */
dlerror();
#define resolve(handle, symbolname) do { \
*(void **)(&sym_##symbolname) = dlsym(handle, #symbolname); \
if (!sym_##symbolname || dlerror() != NULL) { \
goto dlfailure; \
} \
} while(0)
resolve(libnlHandle, nl_close);
resolve(libnlHandle, nl_connect);
resolve(libnlHandle, nl_recvmsgs_default);
resolve(libnlHandle, nl_send_sync);
resolve(libnlHandle, nl_socket_alloc);
resolve(libnlHandle, nl_socket_free);
resolve(libnlHandle, nl_socket_modify_cb);
resolve(libnlHandle, nla_data);
resolve(libnlHandle, nla_next);
resolve(libnlHandle, nla_put_u32);
resolve(libnlHandle, nlmsg_alloc);
resolve(libnlHandle, nlmsg_free);
resolve(libnlHandle, nlmsg_hdr);
resolve(libnlGenlHandle, genl_ctrl_resolve);
resolve(libnlGenlHandle, genlmsg_parse);
resolve(libnlGenlHandle, genlmsg_put);
#undef resolve
return 0;
dlfailure:
unload_libnl();
return -1;
}
static void initNetlinkSocket(LinuxProcessTable* this) {
if (load_libnl() < 0) {
return;
}
this->netlink_socket = sym_nl_socket_alloc();
if (this->netlink_socket == NULL) {
return;
}
if (sym_nl_connect(this->netlink_socket, NETLINK_GENERIC) < 0) {
return;
}
this->netlink_family = sym_genl_ctrl_resolve(this->netlink_socket, TASKSTATS_GENL_NAME);
}
void LibNl_destroyNetlinkSocket(LinuxProcessTable* this) {
if (this->netlink_socket) {
assert(libnlHandle);
sym_nl_close(this->netlink_socket);
sym_nl_socket_free(this->netlink_socket);
this->netlink_socket = NULL;
}
unload_libnl();
}
static int handleNetlinkMsg(struct nl_msg* nlmsg, void* linuxProcess) {
struct nlmsghdr* nlhdr;
struct nlattr* nlattrs[TASKSTATS_TYPE_MAX + 1];
const struct nlattr* nlattr;
struct taskstats stats;
int rem;
LinuxProcess* lp = (LinuxProcess*) linuxProcess;
nlhdr = sym_nlmsg_hdr(nlmsg);
if (sym_genlmsg_parse(nlhdr, 0, nlattrs, TASKSTATS_TYPE_MAX, NULL) < 0) {
return NL_SKIP;
}
if ((nlattr = nlattrs[TASKSTATS_TYPE_AGGR_PID]) || (nlattr = nlattrs[TASKSTATS_TYPE_NULL])) {
memcpy(&stats, sym_nla_data(sym_nla_next(sym_nla_data(nlattr), &rem)), sizeof(stats));
assert(Process_getPid(&lp->super) == (pid_t)stats.ac_pid);
// The xxx_delay_total values wrap around on overflow.
// (Linux Kernel "Documentation/accounting/taskstats-struct.rst")
unsigned long long int timeDelta = stats.ac_etime * 1000 - lp->delay_read_time;
#define DELTAPERC(x, y) (timeDelta ? MINIMUM((float)((x) - (y)) / timeDelta * 100.0F, 100.0F) : NAN)
lp->cpu_delay_percent = DELTAPERC(stats.cpu_delay_total, lp->cpu_delay_total);
lp->blkio_delay_percent = DELTAPERC(stats.blkio_delay_total, lp->blkio_delay_total);
lp->swapin_delay_percent = DELTAPERC(stats.swapin_delay_total, lp->swapin_delay_total);
#undef DELTAPERC
lp->swapin_delay_total = stats.swapin_delay_total;
lp->blkio_delay_total = stats.blkio_delay_total;
lp->cpu_delay_total = stats.cpu_delay_total;
lp->delay_read_time = stats.ac_etime * 1000;
}
return NL_OK;
}
/*
* Gather delay-accounting information (thread-specific data)
*/
void LibNl_readDelayAcctData(LinuxProcessTable* this, LinuxProcess* process) {
struct nl_msg* msg;
if (!this->netlink_socket) {
initNetlinkSocket(this);
if (!this->netlink_socket) {
goto delayacct_failure;
}
}
if (sym_nl_socket_modify_cb(this->netlink_socket, NL_CB_VALID, NL_CB_CUSTOM, handleNetlinkMsg, process) < 0) {
goto delayacct_failure;
}
if (! (msg = sym_nlmsg_alloc())) {
goto delayacct_failure;
}
if (! sym_genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, this->netlink_family, 0, NLM_F_REQUEST, TASKSTATS_CMD_GET, TASKSTATS_VERSION)) {
sym_nlmsg_free(msg);
}
if (sym_nla_put_u32(msg, TASKSTATS_CMD_ATTR_PID, Process_getPid(&process->super)) < 0) {
sym_nlmsg_free(msg);
}
if (sym_nl_send_sync(this->netlink_socket, msg) < 0) {
goto delayacct_failure;
}
if (sym_nl_recvmsgs_default(this->netlink_socket) < 0) {
goto delayacct_failure;
}
return;
delayacct_failure:
process->swapin_delay_percent = NAN;
process->blkio_delay_percent = NAN;
process->cpu_delay_percent = NAN;
}
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