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|
/****** BEGIN COPYRIGHT *******************************************************
*
* Copyright (C) 2012 Feuerlabs, Inc. All rights reserved.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
****** END COPYRIGHT ********************************************************/
//
// Netlink driver
//
#include <stdio.h>
#include <stdarg.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <asm/types.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include "erl_driver.h"
#define ATOM(NAME) am_ ## NAME
#define INIT_ATOM(NAME) am_ ## NAME = driver_mk_atom(#NAME)
// Hack to handle R15 driver used with pre R15 driver
#if ERL_DRV_EXTENDED_MAJOR_VERSION == 1
typedef int ErlDrvSizeT;
typedef int ErlDrvSSizeT;
#endif
#if (ERL_DRV_EXTENDED_MAJOR_VERSION > 2) || ((ERL_DRV_EXTENDED_MAJOR_VERSION == 2) && (ERL_DRV_EXTENDED_MINOR_VERSION >= 1))
#define SEND_TERM(ctx, to, message, len) erl_drv_send_term((ctx)->dport,(to),(message),(len))
#else
#define SEND_TERM(ctx, to, message, len) driver_send_term((ctx)->port,(to),(message),(len))
#endif
#ifndef SOL_NETLINK
#define SOL_NETLINK 270
#endif
#define PORT_CONTROL_BINARY
#define INT_EVENT(ptr) ((int)((long)(ptr)))
typedef struct _nl_ctx_t {
ErlDrvPort port;
ErlDrvTermData dport;
ErlDrvTermData owner;
ErlDrvEvent fd; // netlink socket
int protocol; // netlink protocol
int active;
int is_selecting;
int is_sending;
void* nlbuf;
size_t nlbuf_len;
} nl_ctx_t;
#define CMD_ADD_MEMBERSHIP 1
#define CMD_DROP_MEMBERSHIP 2
#define CMD_ACTIVE 3
#define CMD_DEBUG 4
#define CMD_SET_RCVBUF 5
#define CMD_SET_SNDBUF 6
#define CMD_GET_RCVBUF 7
#define CMD_GET_SNDBUF 8
#define CMD_GET_SIZEOF 9
#define CTL_OK 0
#define CTL_INT 1
#define CTL_PAIR 2
#define CTL_BIN 3
#define CTL_LIST 4
#define CTL_ERR 255
#define CTL_STRERR 254
#define MIN_NL_BUFSIZE (32*1024)
#define MAX_NL_BUFSIZE (512*1024)
#define MAX_VSIZE 16
ErlDrvTermData am_ok;
ErlDrvTermData am_error;
ErlDrvTermData am_undefined;
ErlDrvTermData am_true;
ErlDrvTermData am_false;
ErlDrvTermData am_nl_data;
#define push_atom(atm) do { \
message[i++] = ERL_DRV_ATOM; \
message[i++] = (atm); \
} while(0)
#define push_port(prt) do { \
message[i++] = ERL_DRV_PORT; \
message[i++] = (prt); \
} while(0)
#define push_pid(pid) do { \
message[i++] = ERL_DRV_PID; \
message[i++] = (pid); \
} while(0)
#define push_bin(buf,len) do { \
message[i++] = ERL_DRV_BUF2BINARY; \
message[i++] = (ErlDrvTermData)(buf); \
message[i++] = (ErlDrvTermData)(len); \
} while(0)
#define push_nil() do { \
message[i++] = ERL_DRV_NIL; \
} while(0)
#define push_string(str) do { \
message[i++] = ERL_DRV_STRING; \
message[i++] = (ErlDrvTermData) (str); \
message[i++] = strlen(str); \
} while(0)
#define push_int(val) do { \
message[i++] = ERL_DRV_INT; \
message[i++] = (val); \
} while(0)
#define push_tuple(n) do { \
message[i++] = ERL_DRV_TUPLE; \
message[i++] = (n); \
} while(0)
#define push_list(n) do { \
message[i++] = ERL_DRV_LIST; \
message[i++] = (n); \
} while(0)
ErlDrvEntry nl_drv_entry;
static inline uint32_t get_uint32(uint8_t* ptr)
{
uint32_t value = (ptr[0]<<24) | (ptr[1]<<16) | (ptr[2]<<8) | (ptr[3]<<0);
return value;
}
static inline int32_t get_int32(uint8_t* ptr)
{
uint32_t value = (ptr[0]<<24) | (ptr[1]<<16) | (ptr[2]<<8) | (ptr[3]<<0);
return (int32_t) value;
}
static inline uint16_t get_uint16(uint8_t* ptr)
{
uint16_t value = (ptr[0]<<8) | (ptr[1]<<0);
return value;
}
static inline uint8_t get_uint8(uint8_t* ptr)
{
return ptr[0];
}
static inline int8_t get_int8(uint8_t* ptr)
{
return (int8_t) ptr[0];
}
static inline void put_uint16(uint8_t* ptr, uint16_t v)
{
ptr[0] = v>>8;
ptr[1] = v;
}
static inline void put_uint32(uint8_t* ptr, uint32_t v)
{
ptr[0] = v>>24;
ptr[1] = v>>16;
ptr[2] = v>>8;
ptr[3] = v;
}
static int nl_drv_init(void);
static void nl_drv_finish(void);
static void nl_drv_stop(ErlDrvData);
static void nl_drv_output(ErlDrvData,char*,ErlDrvSizeT);
#if 0
static void nl_drv_outputv(ErlDrvData, ErlIOVec*);
#endif
static void nl_drv_ready_input(ErlDrvData, ErlDrvEvent);
static void nl_drv_ready_output(ErlDrvData data, ErlDrvEvent event);
static ErlDrvData nl_drv_start(ErlDrvPort, char* command);
static ErlDrvSSizeT nl_drv_ctl(ErlDrvData,unsigned int,char*,ErlDrvSizeT,char**,ErlDrvSizeT);
static void nl_drv_timeout(ErlDrvData);
static void nl_drv_stop_select(ErlDrvEvent event, void* arg);
#define DLOG_DEBUG 7
#define DLOG_INFO 6
#define DLOG_NOTICE 5
#define DLOG_WARNING 4
#define DLOG_ERROR 3
#define DLOG_CRITICAL 2
#define DLOG_ALERT 1
#define DLOG_EMERGENCY 0
#define DLOG_NONE -1
#ifndef DLOG_DEFAULT
#define DLOG_DEFAULT DLOG_NONE
#endif
#define DLOG(level,file,line,args...) do { \
if (((level) == DLOG_EMERGENCY) || \
((debug_level >= 0) && ((level) <= debug_level))) { \
emit_log((level),(file),(line),args); \
} \
} while(0)
#define DEBUGF(args...) DLOG(DLOG_DEBUG,__FILE__,__LINE__,args)
#define INFOF(args...) DLOG(DLOG_INFO,__FILE__,__LINE__,args)
#define NOTICEF(args...) DLOG(DLOG_NOTICE,__FILE__,__LINE__,args)
#define WARNINGF(args...) DLOG(DLOG_WARNING,__FILE__,__LINE__,args)
#define ERRORF(args...) DLOG(DLOG_ERROR,__FILE__,__LINE__,args)
#define CRITICALF(args...) DLOG(DLOG_CRITICAL,__FILE__,__LINE__,args)
#define ALERTF(args...) DLOG(DLOG_ALERT,__FILE__,__LINE__,args)
#define EMERGENCYF(args...) DLOG(DLOG_EMERGENCY,__FILE__,__LINE__,args)
static int debug_level = DLOG_DEFAULT;
static void emit_log(int level, char* file, int line, ...)
{
va_list ap;
char* fmt;
if ((level == DLOG_EMERGENCY) ||
((debug_level >= 0) && (level <= debug_level))) {
int save_errno = errno;
va_start(ap, line);
fmt = va_arg(ap, char*);
fprintf(stderr, "%s:%d: ", file, line);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\r\n");
va_end(ap);
errno = save_errno;
}
}
/* general control reply function */
static ErlDrvSSizeT ctl_reply(int rep, void* buf, ErlDrvSizeT len,
char** rbuf, ErlDrvSizeT rsize)
{
char* ptr;
if ((len+1) > rsize) {
#ifdef PORT_CONTROL_BINARY
ErlDrvBinary* bin = driver_alloc_binary(len+1);
if (bin == NULL)
return -1;
ptr = bin->orig_bytes;
*rbuf = (char*) bin;
#else
if ((ptr = driver_alloc(len+1)) == NULL)
return -1;
*rbuf = ptr;
#endif
}
else
ptr = *rbuf;
*ptr++ = rep;
memcpy(ptr, buf, len);
return len+1;
}
static void* nl_realloc_buffer(nl_ctx_t* ctx, size_t len)
{
if (ctx->nlbuf_len < len) {
ctx->nlbuf = driver_realloc(ctx->nlbuf, NLMSG_SPACE(len));
ctx->nlbuf_len = len;
}
return ctx->nlbuf;
}
static int nl_drv_init(void)
{
INIT_ATOM(ok);
INIT_ATOM(error);
INIT_ATOM(undefined);
INIT_ATOM(true);
INIT_ATOM(false);
INIT_ATOM(nl_data);
return 0;
}
static void nl_drv_finish(void)
{
}
static void nl_drv_stop(ErlDrvData d)
{
nl_ctx_t* ctx = (nl_ctx_t*) d;
if (ctx) {
if (ctx->is_selecting)
driver_select(ctx->port, ctx->fd, ERL_DRV_READ, 0);
if (ctx->is_sending)
driver_select(ctx->port, ctx->fd, ERL_DRV_WRITE, 0);
driver_select(ctx->port, ctx->fd, ERL_DRV_USE, 0);
driver_free(ctx);
}
}
static void nl_drv_output(ErlDrvData d, char* buf,ErlDrvSizeT len)
{
nl_ctx_t* ctx = (nl_ctx_t*) d;
int n;
struct nlmsghdr* nlh = (struct nlmsghdr*) buf;
if (!NLMSG_OK(nlh, len)) {
DEBUGF("netlink_drv: data not OK");
}
else {
DEBUGF("netlink_drv: output len=%d, type=%d, seq=%d, pid=%d",
nlh->nlmsg_len, nlh->nlmsg_type, nlh->nlmsg_seq, nlh->nlmsg_pid);
if ((n = driver_sizeq(ctx->port)) > 0) {
driver_enq(ctx->port, buf, len);
DEBUGF("netlink_drv_output: put on queue pending=%d", n+len);
}
else { // try send directly
struct sockaddr_nl dest_addr;
struct iovec iov;
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
memset(&dest_addr, 0, sizeof(dest_addr));
dest_addr.nl_family = AF_NETLINK;
dest_addr.nl_pid = 0; // to kernel
dest_addr.nl_groups = 0; // unicast
iov.iov_base = (void*) buf;
iov.iov_len = len;
msg.msg_name = (void*) &dest_addr;
msg.msg_namelen = sizeof(dest_addr);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
n = sendmsg(INT_EVENT(ctx->fd), &msg, 0);
if (n < 0) {
ERRORF("write error=%s", strerror(errno));
if ((errno == EAGAIN) || (errno = ENOBUFS)) {
DEBUGF("netlink_drv: put on queue", n);
driver_enq(ctx->port, buf, len);
driver_select(ctx->port, ctx->fd, ERL_DRV_WRITE, 1);
ctx->is_sending = 1;
}
}
}
}
}
// netlink socket triggered process data
static void nl_drv_ready_input(ErlDrvData d, ErlDrvEvent event)
{
nl_ctx_t* ctx = (nl_ctx_t*) d;
struct sockaddr_nl src_addr;
struct iovec iov;
struct msghdr msg;
struct nlmsghdr* nlh;
int n;
int part = 0;
int recv_count = 10;
DEBUGF("nl_drv_ready_input");
again:
if (!--recv_count)
return;
memset(&iov, 0, sizeof(iov));
memset(&msg, 0, sizeof(msg));
memset(&src_addr, 0, sizeof(src_addr));
nlh = nl_realloc_buffer(ctx, MIN_NL_BUFSIZE);
iov.iov_base = (void*) nlh;
iov.iov_len = ctx->nlbuf_len;
msg.msg_name = (void*) &src_addr;
msg.msg_namelen = sizeof(src_addr);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if ((n = recvmsg(INT_EVENT(ctx->fd), &msg, 0)) < 0) {
if (errno == EAGAIN)
return;
// send error to erlang ?
WARNINGF("nl_drv_read_input: read error=%s", strerror(errno));
}
else if (n == 0) {
WARNINGF("nl_drv_read_input: read eof?");
}
else {
ErlDrvTermData message[16];
while(NLMSG_OK(nlh, n)) {
int i = 0;
// {nl_data, <port>, <data>}
push_atom(ATOM(nl_data));
push_port(ctx->dport);
push_bin((char*)nlh, nlh->nlmsg_len);
push_tuple(3);
DEBUGF("nl_drv_read_input: part = %d", part);
part++;
if (ctx->active) {
SEND_TERM(ctx, ctx->owner, message, i);
if (ctx->active > 0) {
ctx->active--;
if (ctx->active == 0) {
ctx->is_selecting = 0;
driver_select(ctx->port, ctx->fd, ERL_DRV_READ, 0);
}
}
}
nlh = NLMSG_NEXT(nlh, n);
}
goto again;
}
}
static void nl_drv_ready_output(ErlDrvData d, ErlDrvEvent event)
{
nl_ctx_t* ctx = (nl_ctx_t*) d;
struct sockaddr_nl dest_addr;
int vsize;
SysIOVec* iovp;
struct msghdr msg;
int n;
DEBUGF("nl_drv_ready_output called");
if (ctx->fd != event) {
DEBUGF("nl_drv_ready_output bad event");
return;
}
if ((iovp = driver_peekq(ctx->port, &vsize)) == NULL) {
driver_select(ctx->port, ctx->fd, ERL_DRV_WRITE, 0);
ctx->is_sending = 0;
return;
}
vsize = vsize > MAX_VSIZE ? MAX_VSIZE : vsize;
memset(&msg, 0, sizeof(msg));
memset(&dest_addr, 0, sizeof(dest_addr));
dest_addr.nl_family = AF_NETLINK;
dest_addr.nl_pid = 0; // to kernel
dest_addr.nl_groups = 0; // unicast
msg.msg_name = (void*) &dest_addr;
msg.msg_namelen = sizeof(dest_addr);
msg.msg_iov = (struct iovec*) iovp;
msg.msg_iovlen = vsize;
DEBUGF("nl_drv_ready_output: try send vsize=%d", vsize);
n = sendmsg(INT_EVENT(ctx->fd), &msg, 0);
if (n < 0) {
if ((errno == EAGAIN) || (errno == ENOBUFS))
return;
ERRORF("write error=%s", strerror(errno));
return;
}
DEBUGF("nl_drv_ready_output: sent %d bytes", n);
if (driver_deq(ctx->port, n) == 0) {
driver_select(ctx->port, ctx->fd, ERL_DRV_WRITE, 0);
ctx->is_sending = 0;
}
}
static ErlDrvSSizeT nl_drv_ctl(ErlDrvData d,unsigned int cmd,char* buf0,
ErlDrvSizeT len,char** rbuf,ErlDrvSizeT rsize)
{
uint8_t* buf = (uint8_t*) buf0;
nl_ctx_t* ctx = (nl_ctx_t*) d;
DEBUGF("nl_drv_ctl cmd=%d", cmd);
switch(cmd) {
case CMD_ADD_MEMBERSHIP: {
int opt;
if (len != 4)
goto badarg;
opt = get_int32(buf);
if (setsockopt(INT_EVENT(ctx->fd), SOL_NETLINK,
NETLINK_ADD_MEMBERSHIP,
(void*) &opt, sizeof(opt)) < 0)
goto error;
goto ok;
}
case CMD_DROP_MEMBERSHIP: {
int opt;
if (len != 4)
goto badarg;
opt = get_int32(buf);
if (setsockopt(INT_EVENT(ctx->fd), SOL_NETLINK,
NETLINK_DROP_MEMBERSHIP,
(void*) &opt, sizeof(opt)) < 0)
goto error;
goto ok;
}
case CMD_SET_RCVBUF: {
int opt;
if (len != 4)
goto badarg;
opt = get_int32(buf);
if (setsockopt(INT_EVENT(ctx->fd), SOL_SOCKET,
SO_RCVBUF,
(void*) &opt, sizeof(opt)) < 0)
goto error;
if (opt > 0) {
// make sure i/o buffer match
nl_realloc_buffer(ctx, (size_t)opt);
}
goto ok;
}
case CMD_SET_SNDBUF: {
int opt;
if (len != 4)
goto badarg;
opt = get_int32(buf);
if (setsockopt(INT_EVENT(ctx->fd), SOL_SOCKET,
SO_SNDBUF,
(void*) &opt, sizeof(opt)) < 0)
goto error;
if (opt > 0) {
// make sure i/o buffer match
nl_realloc_buffer(ctx, (size_t)opt);
}
goto ok;
}
case CMD_GET_RCVBUF: {
int opt;
socklen_t optlen;
if (len != 0)
goto badarg;
optlen = sizeof(opt);
opt = get_int32(buf);
if (getsockopt(INT_EVENT(ctx->fd), SOL_SOCKET,
SO_RCVBUF,
(void*) &opt, &optlen) < 0)
goto error;
return ctl_reply(CTL_INT, &opt, sizeof(opt), rbuf, rsize);
}
case CMD_GET_SNDBUF: {
int opt;
socklen_t optlen;
if (len != 0)
goto badarg;
optlen = sizeof(opt);
opt = get_int32(buf);
if (getsockopt(INT_EVENT(ctx->fd), SOL_SOCKET,
SO_SNDBUF,
(void*) &opt, &optlen) < 0)
goto error;
return ctl_reply(CTL_INT, &opt, sizeof(opt), rbuf, rsize);
}
case CMD_GET_SIZEOF: {
uint8_t sizes[6];
sizes[0] = (uint8_t) sizeof(char);
sizes[1] = (uint8_t) sizeof(short);
sizes[2] = (uint8_t) sizeof(int);
sizes[3] = (uint8_t) sizeof(long);
sizes[4] = (uint8_t) sizeof(long long);
sizes[5] = (uint8_t) sizeof(void*);
return ctl_reply(CTL_LIST, sizes, 6, rbuf, rsize);
}
case CMD_ACTIVE: {
int active;
if (len != 4)
goto badarg;
active = get_int32(buf);
if (active) {
if (!ctx->is_selecting)
driver_select(ctx->port, ctx->fd, ERL_DRV_READ, 1);
ctx->is_selecting = 1;
ctx->active = active;
}
else {
if (ctx->is_selecting)
driver_select(ctx->port, ctx->fd, ERL_DRV_READ, 0);
ctx->is_selecting = 0;
ctx->active = 0;
}
goto ok;
break;
}
case CMD_DEBUG: {
if (len != 4)
goto badarg;
debug_level = get_int32(buf);
goto ok;
}
default:
return -1;
}
ok:
return ctl_reply(CTL_OK, NULL, 0, rbuf, rsize);
badarg:
errno = EINVAL;
error: {
char* err_str = erl_errno_id(errno);
return ctl_reply(CTL_ERR, err_str, strlen(err_str), rbuf, rsize);
}
}
static void nl_drv_timeout(ErlDrvData d)
{
(void) d;
fprintf(stderr, "nl_drv_timeout called!!!\r\n");
}
static void nl_drv_stop_select(ErlDrvEvent event, void* arg)
{
(void) arg;
DEBUGF("eth_drv: stop_select event=%d", INT_EVENT(event));
close(INT_EVENT(event));
}
static ErlDrvData nl_drv_start(ErlDrvPort port, char* command)
{
(void) command;
nl_ctx_t* ctx;
int flags;
int fd;
int protocol;
char* ptr;
char* arg;
struct sockaddr_nl addr;
ptr = command;
while(*ptr && (*ptr != ' ')) ptr++; // skip command
while(*ptr && (*ptr == ' ')) ptr++; // and blanks
arg = ptr;
while(*ptr && (*ptr >= '0') && (*ptr <= '9')) ptr++;
if ((arg == ptr) || (*ptr != '\0')) {
errno = EINVAL;
return ERL_DRV_ERROR_ERRNO;
}
protocol = atoi(arg);
if ((fd = socket(PF_NETLINK, SOCK_RAW, protocol)) < 0)
return ERL_DRV_ERROR_ERRNO;
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_groups = 0; // start with no groups
addr.nl_pid = getpid(); // bind using this pid?
if (bind(fd, (struct sockaddr* ) &addr, sizeof(addr)) < 0)
return ERL_DRV_ERROR_ERRNO;
flags = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
if (!(ctx = driver_alloc(sizeof(nl_ctx_t))))
return ERL_DRV_ERROR_ERRNO;
memset(ctx, 0, sizeof(nl_ctx_t));
ctx->port = port;
ctx->dport = driver_mk_port(port);
ctx->owner = driver_caller(port);
ctx->protocol = protocol;
ctx->fd = (ErlDrvEvent)((long)fd);
nl_realloc_buffer(ctx, MIN_NL_BUFSIZE); // create i/o buffer
#ifdef PORT_CONTROL_BINARY
set_port_control_flags(port, PORT_CONTROL_FLAG_BINARY);
#endif
return (ErlDrvData) ctx;
}
DRIVER_INIT(nl_drv)
{
ErlDrvEntry* ptr = &nl_drv_entry;
ptr->driver_name = "netlink_drv";
ptr->init = nl_drv_init;
ptr->start = nl_drv_start;
ptr->stop = nl_drv_stop;
ptr->output = nl_drv_output;
ptr->ready_input = nl_drv_ready_input;
ptr->ready_output = nl_drv_ready_output;
ptr->finish = nl_drv_finish;
ptr->control = nl_drv_ctl;
ptr->timeout = nl_drv_timeout;
#if 0
ptr->outputv = nl_drv_outputv;
#endif
ptr->ready_async = 0;
ptr->flush = 0;
ptr->call = 0;
ptr->event = 0;
ptr->extended_marker = ERL_DRV_EXTENDED_MARKER;
ptr->major_version = ERL_DRV_EXTENDED_MAJOR_VERSION;
ptr->minor_version = ERL_DRV_EXTENDED_MINOR_VERSION;
ptr->driver_flags = ERL_DRV_FLAG_USE_PORT_LOCKING;
ptr->process_exit = 0;
ptr->stop_select = nl_drv_stop_select;
return (ErlDrvEntry*) ptr;
}
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