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third_party_libnl/lib/utils.c
Thomas Haller 55ea6e6b6c lib: use MSG_PEEK by default for nl_recvmsgs() 
The MSG_PEEK API of recvmsg() should be avoid because it requires an additional
syscall. But worse is to choose a too small buffer size and failing to receive
the message.

A user who is aware of the issue can avoid MSG_PEEK by either
nl_socket_disable_msg_peek()/nl_socket_enable_msg_peek() or by setting
a buffer size via nl_socket_set_msg_buf_size().

By default however we now use MSG_PEEK. This is more important since commit
90c6ebec9b where the link dump request can be rather large.

Signed-off-by: Thomas Haller <thaller@redhat.com>
2016-11-30 15:40:26 +01:00

1224 lines
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/*
* lib/utils.c Utility Functions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2003-2012 Thomas Graf <tgraf@suug.ch>
*/
/**
* @ingroup core
* @defgroup utils Utilities
*
* Collection of helper functions
*
* @{
*
* Header
* ------
* ~~~~{.c}
* #include <netlink/utils.h>
* ~~~~
*/
#include <netlink-private/netlink.h>
#include <netlink-private/utils.h>
#include <netlink/netlink.h>
#include <netlink/utils.h>
#include <linux/socket.h>
#include <stdlib.h> /* exit() */
#include <locale.h>
/**
* Global variable indicating the desired level of debugging output.
*
* Level | Messages Printed
* ----- | ---------------------------------------------------------
* 0 | Debugging output disabled
* 1 | Warnings, important events and notifications
* 2 | More or less important debugging messages
* 3 | Repetitive events causing a flood of debugging messages
* 4 | Even less important messages
*
* If available, the variable will be initialized to the value of the
* environment variable `NLDBG`. The default value is 0 (disabled).
*
* For more information, see section @core_doc{_debugging, Debugging}.
*/
int nl_debug = 0;
/** @cond SKIP */
#ifdef NL_DEBUG
struct nl_dump_params nl_debug_dp = {
.dp_type = NL_DUMP_DETAILS,
};
static void __init nl_debug_init(void)
{
char *nldbg, *end;
if ((nldbg = getenv("NLDBG"))) {
long level = strtol(nldbg, &end, 0);
if (nldbg != end)
nl_debug = level;
}
nl_debug_dp.dp_fd = stderr;
}
#endif
int __nl_read_num_str_file(const char *path, int (*cb)(long, const char *))
{
FILE *fd;
char buf[128];
fd = fopen(path, "r");
if (fd == NULL)
return -nl_syserr2nlerr(errno);
while (fgets(buf, sizeof(buf), fd)) {
int goodlen, err;
long num;
char *end;
if (*buf == '#' || *buf == '\n' || *buf == '\r')
continue;
num = strtol(buf, &end, 0);
if (end == buf) {
fclose(fd);
return -NLE_INVAL;
}
if (num == LONG_MIN || num == LONG_MAX) {
fclose(fd);
return -NLE_RANGE;
}
while (*end == ' ' || *end == '\t')
end++;
goodlen = strcspn(end, "#\r\n\t ");
if (goodlen == 0) {
fclose(fd);
return -NLE_INVAL;
}
end[goodlen] = '\0';
err = cb(num, end);
if (err < 0) {
fclose(fd);
return err;
}
}
fclose(fd);
return 0;
}
const char *nl_strerror_l(int err)
{
int errno_save = errno;
locale_t loc = newlocale(LC_MESSAGES_MASK, "", (locale_t)0);
const char *buf;
if (loc == (locale_t)0) {
if (errno == ENOENT)
loc = newlocale(LC_MESSAGES_MASK,
"POSIX", (locale_t)0);
}
if (loc != (locale_t)0) {
buf = strerror_l(err, loc);
freelocale(loc);
} else {
buf = "newlocale() failed";
}
errno = errno_save;
return buf;
}
/** @endcond */
/**
* @name Pretty Printing of Numbers
* @{
*/
/**
* Cancel down a byte counter
* @arg l byte counter
* @arg unit destination unit pointer
*
* Cancels down a byte counter until it reaches a reasonable
* unit. The chosen unit is assigned to \a unit.
* This function assume 1024 bytes in one kilobyte
*
* @return The cancelled down byte counter in the new unit.
*/
double nl_cancel_down_bytes(unsigned long long l, char **unit)
{
if (l >= 1099511627776LL) {
*unit = "TiB";
return ((double) l) / 1099511627776LL;
} else if (l >= 1073741824) {
*unit = "GiB";
return ((double) l) / 1073741824;
} else if (l >= 1048576) {
*unit = "MiB";
return ((double) l) / 1048576;
} else if (l >= 1024) {
*unit = "KiB";
return ((double) l) / 1024;
} else {
*unit = "B";
return (double) l;
}
}
/**
* Cancel down a bit counter
* @arg l bit counter
* @arg unit destination unit pointer
*
* Cancels down bit counter until it reaches a reasonable
* unit. The chosen unit is assigned to \a unit.
* This function assume 1000 bits in one kilobit
*
* @return The cancelled down bit counter in the new unit.
*/
double nl_cancel_down_bits(unsigned long long l, char **unit)
{
if (l >= 1000000000000ULL) {
*unit = "Tbit";
return ((double) l) / 1000000000000ULL;
}
if (l >= 1000000000) {
*unit = "Gbit";
return ((double) l) / 1000000000;
}
if (l >= 1000000) {
*unit = "Mbit";
return ((double) l) / 1000000;
}
if (l >= 1000) {
*unit = "Kbit";
return ((double) l) / 1000;
}
*unit = "bit";
return (double) l;
}
int nl_rate2str(unsigned long long rate, int type, char *buf, size_t len)
{
char *unit;
double frac;
switch (type) {
case NL_BYTE_RATE:
frac = nl_cancel_down_bytes(rate, &unit);
break;
case NL_BIT_RATE:
frac = nl_cancel_down_bits(rate, &unit);
break;
default:
BUG();
}
return snprintf(buf, len, "%.2f%s/s", frac, unit);
}
/**
* Cancel down a micro second value
* @arg l micro seconds
* @arg unit destination unit pointer
*
* Cancels down a microsecond counter until it reaches a
* reasonable unit. The chosen unit is assigned to \a unit.
*
* @return The cancelled down microsecond in the new unit
*/
double nl_cancel_down_us(uint32_t l, char **unit)
{
if (l >= 1000000) {
*unit = "s";
return ((double) l) / 1000000;
} else if (l >= 1000) {
*unit = "ms";
return ((double) l) / 1000;
} else {
*unit = "us";
return (double) l;
}
}
/** @} */
/**
* @name Generic Unit Translations
* @{
*/
/**
* Convert a character string to a size
* @arg str size encoded as character string
*
* Converts the specified size as character to the corresponding
* number of bytes.
*
* Supported formats are:
* - b,kb/k,m/mb,gb/g for bytes
* - bit,kbit/mbit/gbit
*
* This function assume 1000 bits in one kilobit and
* 1024 bytes in one kilobyte
*
* @return The number of bytes or -1 if the string is unparseable
*/
long nl_size2int(const char *str)
{
char *p;
long l = strtol(str, &p, 0);
if (p == str)
return -NLE_INVAL;
if (*p) {
if (!strcasecmp(p, "kb") || !strcasecmp(p, "k"))
l *= 1024;
else if (!strcasecmp(p, "gb") || !strcasecmp(p, "g"))
l *= 1024*1024*1024;
else if (!strcasecmp(p, "gbit"))
l *= 1000000000L/8;
else if (!strcasecmp(p, "mb") || !strcasecmp(p, "m"))
l *= 1024*1024;
else if (!strcasecmp(p, "mbit"))
l *= 1000000/8;
else if (!strcasecmp(p, "kbit"))
l *= 1000/8;
else if (!strcasecmp(p, "bit"))
l /= 8;
else if (strcasecmp(p, "b") != 0)
return -NLE_INVAL;
}
return l;
}
static const struct {
double limit;
const char *unit;
} size_units[] = {
{ 1024. * 1024. * 1024. * 1024. * 1024., "EiB" },
{ 1024. * 1024. * 1024. * 1024., "TiB" },
{ 1024. * 1024. * 1024., "GiB" },
{ 1024. * 1024., "MiB" },
{ 1024., "KiB" },
{ 0., "B" },
};
/**
* Convert a size toa character string
* @arg size Size in number of bytes
* @arg buf Buffer to write character string to
* @arg len Size of buf
*
* This function converts a value in bytes to a human readable representation
* of it. The function uses IEC prefixes:
*
* @code
* 1024 bytes => 1 KiB
* 1048576 bytes => 1 MiB
* @endcode
*
* The highest prefix is used which ensures a result of >= 1.0, the result
* is provided as floating point number with a maximum precision of 2 digits:
* @code
* 965176 bytes => 942.55 KiB
* @endcode
*
* @return pointer to buf
*/
char *nl_size2str(const size_t size, char *buf, const size_t len)
{
size_t i;
if (size == 0) {
snprintf(buf, len, "0B");
return buf;
}
for (i = 0; i < ARRAY_SIZE(size_units); i++) {
if (size >= size_units[i].limit) {
snprintf(buf, len, "%.2g%s",
(double) size / size_units[i].limit,
size_units[i].unit);
return buf;
}
}
BUG();
}
/**
* Convert a character string to a probability
* @arg str probability encoded as character string
*
* Converts the specified probability as character to the
* corresponding probability number.
*
* Supported formats are:
* - 0.0-1.0
* - 0%-100%
*
* @return The probability relative to NL_PROB_MIN and NL_PROB_MAX
*/
long nl_prob2int(const char *str)
{
char *p;
double d = strtod(str, &p);
if (p == str)
return -NLE_INVAL;
if (d > 1.0)
d /= 100.0f;
if (d > 1.0f || d < 0.0f)
return -NLE_RANGE;
if (*p && strcmp(p, "%") != 0)
return -NLE_INVAL;
return rint(d * NL_PROB_MAX);
}
/** @} */
/**
* @name Time Translations
* @{
*/
#ifndef USER_HZ
#define USER_HZ 100
#endif
static uint32_t user_hz = USER_HZ;
static uint32_t psched_hz = USER_HZ;
static double ticks_per_usec = 1.0f;
/* Retrieves the configured HZ and ticks/us value in the kernel.
* The value is cached. Supported ways of getting it:
*
* 1) environment variable
* 2) /proc/net/psched and sysconf
*
* Supports the environment variables:
* PROC_NET_PSCHED - may point to psched file in /proc
* PROC_ROOT - may point to /proc fs */
static void __init get_psched_settings(void)
{
char name[FILENAME_MAX];
FILE *fd;
int got_hz = 0;
if (getenv("HZ")) {
long hz = strtol(getenv("HZ"), NULL, 0);
if (LONG_MIN != hz && LONG_MAX != hz) {
user_hz = hz;
got_hz = 1;
}
}
if (!got_hz)
user_hz = sysconf(_SC_CLK_TCK);
psched_hz = user_hz;
if (getenv("TICKS_PER_USEC")) {
double t = strtod(getenv("TICKS_PER_USEC"), NULL);
ticks_per_usec = t;
}
else {
if (getenv("PROC_NET_PSCHED"))
snprintf(name, sizeof(name), "%s", getenv("PROC_NET_PSCHED"));
else if (getenv("PROC_ROOT"))
snprintf(name, sizeof(name), "%s/net/psched",
getenv("PROC_ROOT"));
else
strncpy(name, "/proc/net/psched", sizeof(name) - 1);
if ((fd = fopen(name, "r"))) {
unsigned int ns_per_usec, ns_per_tick, nom, denom;
if (fscanf(fd, "%08x %08x %08x %08x",
&ns_per_usec, &ns_per_tick, &nom, &denom) != 4) {
NL_DBG(1, "Fatal error: can not read psched settings from \"%s\". " \
"Try to set TICKS_PER_USEC, PROC_NET_PSCHED or PROC_ROOT " \
"environment variables\n", name);
exit(1);
}
ticks_per_usec = (double) ns_per_usec /
(double) ns_per_tick;
if (nom == 1000000)
psched_hz = denom;
fclose(fd);
}
}
}
/**
* Return the value of HZ
*/
int nl_get_user_hz(void)
{
return user_hz;
}
/**
* Return the value of packet scheduler HZ
*/
int nl_get_psched_hz(void)
{
return psched_hz;
}
/**
* Convert micro seconds to ticks
* @arg us micro seconds
* @return number of ticks
*/
uint32_t nl_us2ticks(uint32_t us)
{
return us * ticks_per_usec;
}
/**
* Convert ticks to micro seconds
* @arg ticks number of ticks
* @return microseconds
*/
uint32_t nl_ticks2us(uint32_t ticks)
{
return ticks / ticks_per_usec;
}
int nl_str2msec(const char *str, uint64_t *result)
{
uint64_t total = 0, l;
int plen;
char *p;
do {
l = strtoul(str, &p, 0);
if (p == str)
return -NLE_INVAL;
else if (*p) {
plen = strcspn(p, " \t");
if (!plen)
total += l;
else if (!strncasecmp(p, "sec", plen))
total += (l * 1000);
else if (!strncasecmp(p, "min", plen))
total += (l * 1000*60);
else if (!strncasecmp(p, "hour", plen))
total += (l * 1000*60*60);
else if (!strncasecmp(p, "day", plen))
total += (l * 1000*60*60*24);
else
return -NLE_INVAL;
str = p + plen;
} else
total += l;
} while (*str && *p);
*result = total;
return 0;
}
/**
* Convert milliseconds to a character string
* @arg msec number of milliseconds
* @arg buf destination buffer
* @arg len buffer length
*
* Converts milliseconds to a character string split up in days, hours,
* minutes, seconds, and milliseconds and stores it in the specified
* destination buffer.
*
* @return The destination buffer.
*/
char * nl_msec2str(uint64_t msec, char *buf, size_t len)
{
uint64_t split[5];
size_t i;
static const char *units[5] = {"d", "h", "m", "s", "msec"};
char * const buf_orig = buf;
if (msec == 0) {
snprintf(buf, len, "0msec");
return buf_orig;
}
#define _SPLIT(idx, unit) if ((split[idx] = msec / unit)) msec %= unit
_SPLIT(0, 86400000); /* days */
_SPLIT(1, 3600000); /* hours */
_SPLIT(2, 60000); /* minutes */
_SPLIT(3, 1000); /* seconds */
#undef _SPLIT
split[4] = msec;
for (i = 0; i < ARRAY_SIZE(split) && len; i++) {
int l;
if (split[i] == 0)
continue;
l = snprintf(buf, len, "%s%" PRIu64 "%s",
(buf==buf_orig) ? "" : " ", split[i], units[i]);
buf += l;
len -= l;
}
return buf_orig;
}
/** @} */
/**
* @name Netlink Family Translations
* @{
*/
static const struct trans_tbl nlfamilies[] = {
__ADD(NETLINK_ROUTE,route),
__ADD(NETLINK_USERSOCK,usersock),
__ADD(NETLINK_FIREWALL,firewall),
__ADD(NETLINK_INET_DIAG,inetdiag),
__ADD(NETLINK_NFLOG,nflog),
__ADD(NETLINK_XFRM,xfrm),
__ADD(NETLINK_SELINUX,selinux),
__ADD(NETLINK_ISCSI,iscsi),
__ADD(NETLINK_AUDIT,audit),
__ADD(NETLINK_FIB_LOOKUP,fib_lookup),
__ADD(NETLINK_CONNECTOR,connector),
__ADD(NETLINK_NETFILTER,netfilter),
__ADD(NETLINK_IP6_FW,ip6_fw),
__ADD(NETLINK_DNRTMSG,dnrtmsg),
__ADD(NETLINK_KOBJECT_UEVENT,kobject_uevent),
__ADD(NETLINK_GENERIC,generic),
__ADD(NETLINK_SCSITRANSPORT,scsitransport),
__ADD(NETLINK_ECRYPTFS,ecryptfs),
__ADD(NETLINK_RDMA,rdma),
__ADD(NETLINK_CRYPTO,crypto),
};
char * nl_nlfamily2str(int family, char *buf, size_t size)
{
return __type2str(family, buf, size, nlfamilies,
ARRAY_SIZE(nlfamilies));
}
int nl_str2nlfamily(const char *name)
{
return __str2type(name, nlfamilies, ARRAY_SIZE(nlfamilies));
}
/**
* @}
*/
/**
* @name Link Layer Protocol Translations
* @{
*/
static const struct trans_tbl llprotos[] = {
{0, "generic"},
__ADD(ARPHRD_NETROM,netrom),
__ADD(ARPHRD_ETHER,ether),
__ADD(ARPHRD_EETHER,eether),
__ADD(ARPHRD_AX25,ax25),
__ADD(ARPHRD_PRONET,pronet),
__ADD(ARPHRD_CHAOS,chaos),
__ADD(ARPHRD_IEEE802,ieee802),
__ADD(ARPHRD_ARCNET,arcnet),
__ADD(ARPHRD_APPLETLK,atalk),
__ADD(ARPHRD_DLCI,dlci),
__ADD(ARPHRD_ATM,atm),
__ADD(ARPHRD_METRICOM,metricom),
__ADD(ARPHRD_IEEE1394,ieee1394),
__ADD(ARPHRD_EUI64,eui64),
__ADD(ARPHRD_INFINIBAND,infiniband),
__ADD(ARPHRD_SLIP,slip),
__ADD(ARPHRD_CSLIP,cslip),
__ADD(ARPHRD_SLIP6,slip6),
__ADD(ARPHRD_CSLIP6,cslip6),
__ADD(ARPHRD_RSRVD,rsrvd),
__ADD(ARPHRD_ADAPT,adapt),
__ADD(ARPHRD_ROSE,rose),
__ADD(ARPHRD_X25,x25),
__ADD(ARPHRD_HWX25,hwx25),
__ADD(ARPHRD_CAN,can),
__ADD(ARPHRD_PPP,ppp),
__ADD(ARPHRD_CISCO,cisco),
__ADD(ARPHRD_HDLC,hdlc),
__ADD(ARPHRD_LAPB,lapb),
__ADD(ARPHRD_DDCMP,ddcmp),
__ADD(ARPHRD_RAWHDLC,rawhdlc),
__ADD(ARPHRD_TUNNEL,ipip),
__ADD(ARPHRD_TUNNEL6,tunnel6),
__ADD(ARPHRD_FRAD,frad),
__ADD(ARPHRD_SKIP,skip),
__ADD(ARPHRD_LOOPBACK,loopback),
__ADD(ARPHRD_LOCALTLK,localtlk),
__ADD(ARPHRD_FDDI,fddi),
__ADD(ARPHRD_BIF,bif),
__ADD(ARPHRD_SIT,sit),
__ADD(ARPHRD_IPDDP,ip/ddp),
__ADD(ARPHRD_IPGRE,gre),
__ADD(ARPHRD_PIMREG,pimreg),
__ADD(ARPHRD_HIPPI,hippi),
__ADD(ARPHRD_ASH,ash),
__ADD(ARPHRD_ECONET,econet),
__ADD(ARPHRD_IRDA,irda),
__ADD(ARPHRD_FCPP,fcpp),
__ADD(ARPHRD_FCAL,fcal),
__ADD(ARPHRD_FCPL,fcpl),
__ADD(ARPHRD_FCFABRIC,fcfb_0),
__ADD(ARPHRD_FCFABRIC+1,fcfb_1),
__ADD(ARPHRD_FCFABRIC+2,fcfb_2),
__ADD(ARPHRD_FCFABRIC+3,fcfb_3),
__ADD(ARPHRD_FCFABRIC+4,fcfb_4),
__ADD(ARPHRD_FCFABRIC+5,fcfb_5),
__ADD(ARPHRD_FCFABRIC+6,fcfb_6),
__ADD(ARPHRD_FCFABRIC+7,fcfb_7),
__ADD(ARPHRD_FCFABRIC+8,fcfb_8),
__ADD(ARPHRD_FCFABRIC+9,fcfb_9),
__ADD(ARPHRD_FCFABRIC+10,fcfb_10),
__ADD(ARPHRD_FCFABRIC+11,fcfb_11),
__ADD(ARPHRD_FCFABRIC+12,fcfb_12),
__ADD(ARPHRD_IEEE802_TR,tr),
__ADD(ARPHRD_IEEE80211,ieee802.11),
__ADD(ARPHRD_IEEE80211_PRISM,ieee802.11_prism),
__ADD(ARPHRD_IEEE80211_RADIOTAP,ieee802.11_radiotap),
__ADD(ARPHRD_IEEE802154,ieee802.15.4),
__ADD(ARPHRD_IEEE802154_MONITOR,ieee802.15.4_monitor),
__ADD(ARPHRD_PHONET,phonet),
__ADD(ARPHRD_PHONET_PIPE,phonet_pipe),
__ADD(ARPHRD_CAIF,caif),
__ADD(ARPHRD_IP6GRE,ip6gre),
__ADD(ARPHRD_NETLINK,netlink),
__ADD(ARPHRD_6LOWPAN,6lowpan),
__ADD(ARPHRD_VOID,void),
__ADD(ARPHRD_NONE,nohdr),
};
char * nl_llproto2str(int llproto, char *buf, size_t len)
{
return __type2str(llproto, buf, len, llprotos, ARRAY_SIZE(llprotos));
}
int nl_str2llproto(const char *name)
{
return __str2type(name, llprotos, ARRAY_SIZE(llprotos));
}
/** @} */
/**
* @name Ethernet Protocol Translations
* @{
*/
static const struct trans_tbl ether_protos[] = {
__ADD(ETH_P_LOOP,loop),
__ADD(ETH_P_PUP,pup),
__ADD(ETH_P_PUPAT,pupat),
__ADD(ETH_P_IP,ip),
__ADD(ETH_P_X25,x25),
__ADD(ETH_P_ARP,arp),
__ADD(ETH_P_BPQ,bpq),
__ADD(ETH_P_IEEEPUP,ieeepup),
__ADD(ETH_P_IEEEPUPAT,ieeepupat),
__ADD(ETH_P_DEC,dec),
__ADD(ETH_P_DNA_DL,dna_dl),
__ADD(ETH_P_DNA_RC,dna_rc),
__ADD(ETH_P_DNA_RT,dna_rt),
__ADD(ETH_P_LAT,lat),
__ADD(ETH_P_DIAG,diag),
__ADD(ETH_P_CUST,cust),
__ADD(ETH_P_SCA,sca),
__ADD(ETH_P_TEB,teb),
__ADD(ETH_P_RARP,rarp),
__ADD(ETH_P_ATALK,atalk),
__ADD(ETH_P_AARP,aarp),
#ifdef ETH_P_8021Q
__ADD(ETH_P_8021Q,802.1q),
#endif
__ADD(ETH_P_IPX,ipx),
__ADD(ETH_P_IPV6,ipv6),
__ADD(ETH_P_PAUSE,pause),
__ADD(ETH_P_SLOW,slow),
#ifdef ETH_P_WCCP
__ADD(ETH_P_WCCP,wccp),
#endif
__ADD(ETH_P_PPP_DISC,ppp_disc),
__ADD(ETH_P_PPP_SES,ppp_ses),
__ADD(ETH_P_MPLS_UC,mpls_uc),
__ADD(ETH_P_MPLS_MC,mpls_mc),
__ADD(ETH_P_ATMMPOA,atmmpoa),
__ADD(ETH_P_LINK_CTL,link_ctl),
__ADD(ETH_P_ATMFATE,atmfate),
__ADD(ETH_P_PAE,pae),
__ADD(ETH_P_AOE,aoe),
__ADD(ETH_P_TIPC,tipc),
__ADD(ETH_P_1588,ieee1588),
__ADD(ETH_P_FCOE,fcoe),
__ADD(ETH_P_FIP,fip),
__ADD(ETH_P_EDSA,edsa),
__ADD(ETH_P_EDP2,edp2),
__ADD(ETH_P_802_3,802.3),
__ADD(ETH_P_AX25,ax25),
__ADD(ETH_P_ALL,all),
__ADD(ETH_P_802_2,802.2),
__ADD(ETH_P_SNAP,snap),
__ADD(ETH_P_DDCMP,ddcmp),
__ADD(ETH_P_WAN_PPP,wan_ppp),
__ADD(ETH_P_PPP_MP,ppp_mp),
__ADD(ETH_P_LOCALTALK,localtalk),
__ADD(ETH_P_CAN,can),
__ADD(ETH_P_PPPTALK,ppptalk),
__ADD(ETH_P_TR_802_2,tr_802.2),
__ADD(ETH_P_MOBITEX,mobitex),
__ADD(ETH_P_CONTROL,control),
__ADD(ETH_P_IRDA,irda),
__ADD(ETH_P_ECONET,econet),
__ADD(ETH_P_HDLC,hdlc),
__ADD(ETH_P_ARCNET,arcnet),
__ADD(ETH_P_DSA,dsa),
__ADD(ETH_P_TRAILER,trailer),
__ADD(ETH_P_PHONET,phonet),
__ADD(ETH_P_IEEE802154,ieee802154),
__ADD(ETH_P_CAIF,caif),
};
char *nl_ether_proto2str(int eproto, char *buf, size_t len)
{
return __type2str(eproto, buf, len, ether_protos,
ARRAY_SIZE(ether_protos));
}
int nl_str2ether_proto(const char *name)
{
return __str2type(name, ether_protos, ARRAY_SIZE(ether_protos));
}
/** @} */
/**
* @name IP Protocol Translations
* @{
*/
char *nl_ip_proto2str(int proto, char *buf, size_t len)
{
struct protoent *p = getprotobynumber(proto);
if (p) {
snprintf(buf, len, "%s", p->p_name);
return buf;
}
snprintf(buf, len, "0x%x", proto);
return buf;
}
int nl_str2ip_proto(const char *name)
{
struct protoent *p = getprotobyname(name);
unsigned long l;
char *end;
if (p)
return p->p_proto;
l = strtoul(name, &end, 0);
if (l == ULONG_MAX || *end != '\0')
return -NLE_OBJ_NOTFOUND;
return (int) l;
}
/** @} */
/**
* @name Dumping Helpers
* @{
*/
/**
* Handle a new line while dumping
* @arg params Dumping parameters
*
* This function must be called before dumping any onto a
* new line. It will ensure proper prefixing as specified
* by the dumping parameters.
*
* @note This function will NOT dump any newlines itself
*/
void nl_new_line(struct nl_dump_params *params)
{
params->dp_line++;
if (params->dp_prefix) {
int i;
for (i = 0; i < params->dp_prefix; i++) {
if (params->dp_fd)
fprintf(params->dp_fd, " ");
else if (params->dp_buf)
strncat(params->dp_buf, " ",
params->dp_buflen -
strlen(params->dp_buf) - 1);
}
}
if (params->dp_nl_cb)
params->dp_nl_cb(params, params->dp_line);
}
static void dump_one(struct nl_dump_params *parms, const char *fmt,
va_list args)
{
if (parms->dp_fd)
vfprintf(parms->dp_fd, fmt, args);
else if (parms->dp_buf || parms->dp_cb) {
char *buf = NULL;
if (vasprintf(&buf, fmt, args) >= 0) {
if (parms->dp_cb)
parms->dp_cb(parms, buf);
else
strncat(parms->dp_buf, buf,
parms->dp_buflen -
strlen(parms->dp_buf) - 1);
free(buf);
}
}
}
/**
* Dump a formatted character string
* @arg params Dumping parameters
* @arg fmt printf style formatting string
* @arg ... Arguments to formatting string
*
* Dumps a printf style formatting string to the output device
* as specified by the dumping parameters.
*/
void nl_dump(struct nl_dump_params *params, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
dump_one(params, fmt, args);
va_end(args);
}
void nl_dump_line(struct nl_dump_params *parms, const char *fmt, ...)
{
va_list args;
nl_new_line(parms);
va_start(args, fmt);
dump_one(parms, fmt, args);
va_end(args);
}
/** @} */
/** @cond SKIP */
int __trans_list_add(int i, const char *a, struct nl_list_head *head)
{
struct trans_list *tl;
tl = calloc(1, sizeof(*tl));
if (!tl)
return -NLE_NOMEM;
tl->i = i;
tl->a = strdup(a);
nl_list_add_tail(&tl->list, head);
return 0;
}
void __trans_list_clear(struct nl_list_head *head)
{
struct trans_list *tl, *next;
nl_list_for_each_entry_safe(tl, next, head, list) {
free(tl->a);
free(tl);
}
nl_init_list_head(head);
}
char *__type2str(int type, char *buf, size_t len,
const struct trans_tbl *tbl, size_t tbl_len)
{
size_t i;
for (i = 0; i < tbl_len; i++) {
if (tbl[i].i == type) {
snprintf(buf, len, "%s", tbl[i].a);
return buf;
}
}
snprintf(buf, len, "0x%x", type);
return buf;
}
char *__list_type2str(int type, char *buf, size_t len,
struct nl_list_head *head)
{
struct trans_list *tl;
nl_list_for_each_entry(tl, head, list) {
if (tl->i == type) {
snprintf(buf, len, "%s", tl->a);
return buf;
}
}
snprintf(buf, len, "0x%x", type);
return buf;
}
char *__flags2str(int flags, char *buf, size_t len,
const struct trans_tbl *tbl, size_t tbl_len)
{
size_t i;
int tmp = flags;
memset(buf, 0, len);
for (i = 0; i < tbl_len; i++) {
if (tbl[i].i & tmp) {
tmp &= ~tbl[i].i;
strncat(buf, tbl[i].a, len - strlen(buf) - 1);
if ((tmp & flags))
strncat(buf, ",", len - strlen(buf) - 1);
}
}
return buf;
}
int __str2type(const char *buf, const struct trans_tbl *tbl, size_t tbl_len)
{
unsigned long l;
char *end;
size_t i;
if (*buf == '\0')
return -NLE_INVAL;
for (i = 0; i < tbl_len; i++)
if (!strcasecmp(tbl[i].a, buf))
return tbl[i].i;
l = strtoul(buf, &end, 0);
if (l == ULONG_MAX || *end != '\0')
return -NLE_OBJ_NOTFOUND;
return (int) l;
}
int __list_str2type(const char *buf, struct nl_list_head *head)
{
struct trans_list *tl;
unsigned long l;
char *end;
if (*buf == '\0')
return -NLE_INVAL;
nl_list_for_each_entry(tl, head, list) {
if (!strcasecmp(tl->a, buf))
return tl->i;
}
l = strtoul(buf, &end, 0);
if (l == ULONG_MAX || *end != '\0')
return -NLE_OBJ_NOTFOUND;
return (int) l;
}
int __str2flags(const char *buf, const struct trans_tbl *tbl, size_t tbl_len)
{
int flags = 0;
size_t i;
size_t len; /* ptrdiff_t ? */
char *p = (char *) buf, *t;
for (;;) {
if (*p == ' ')
p++;
t = strchr(p, ',');
len = t ? t - p : strlen(p);
for (i = 0; i < tbl_len; i++)
if (len == strlen(tbl[i].a) &&
!strncasecmp(tbl[i].a, p, len))
flags |= tbl[i].i;
if (!t)
return flags;
p = ++t;
}
return 0;
}
void dump_from_ops(struct nl_object *obj, struct nl_dump_params *params)
{
int type = params->dp_type;
if (type < 0 || type > NL_DUMP_MAX)
BUG();
params->dp_line = 0;
if (params->dp_dump_msgtype) {
#if 0
/* XXX */
char buf[64];
dp_dump_line(params, 0, "%s ",
nl_cache_mngt_type2name(obj->ce_ops,
obj->ce_ops->co_protocol,
obj->ce_msgtype,
buf, sizeof(buf)));
#endif
params->dp_pre_dump = 1;
}
if (obj->ce_ops->oo_dump[type])
obj->ce_ops->oo_dump[type](obj, params);
}
/**
* Check for library capabilities
*
* @arg capability capability identifier
*
* Check whether the loaded libnl library supports a certain capability.
* This is useful so that applications can workaround known issues of
* libnl that are fixed in newer library versions, without
* having a hard dependency on the new version. It is also useful, for
* capabilities that cannot easily be detected using autoconf tests.
* The capabilities are integer constants with name NL_CAPABILITY_*.
*
* As this function is intended to detect capabilities at runtime,
* you might not want to depend during compile time on the NL_CAPABILITY_*
* names. Instead you can use their numeric values which are guaranteed not to
* change meaning.
*
* @return non zero if libnl supports a certain capability, 0 otherwise.
**/
int nl_has_capability (int capability)
{
static const uint8_t caps[ ( NL_CAPABILITY_MAX + 7 ) / 8 ] = {
#define _NL_ASSERT(expr) ( 0 * sizeof(struct { unsigned int x: ( (!!(expr)) ? 1 : -1 ); }) )
#define _NL_SETV(i, r, v) \
( _NL_ASSERT( (v) == 0 || (i) * 8 + (r) == (v) - 1 ) + \
( (v) == 0 ? 0 : (1 << (r)) ) )
#define _NL_SET(i, v0, v1, v2, v3, v4, v5, v6, v7) \
[(i)] = ( \
_NL_SETV((i), 0, (v0)) | _NL_SETV((i), 4, (v4)) | \
_NL_SETV((i), 1, (v1)) | _NL_SETV((i), 5, (v5)) | \
_NL_SETV((i), 2, (v2)) | _NL_SETV((i), 6, (v6)) | \
_NL_SETV((i), 3, (v3)) | _NL_SETV((i), 7, (v7)) )
_NL_SET(0,
NL_CAPABILITY_ROUTE_BUILD_MSG_SET_SCOPE,
NL_CAPABILITY_ROUTE_LINK_VETH_GET_PEER_OWN_REFERENCE,
NL_CAPABILITY_ROUTE_LINK_CLS_ADD_ACT_OWN_REFERENCE,
NL_CAPABILITY_NL_CONNECT_RETRY_GENERATE_PORT_ON_ADDRINUSE,
NL_CAPABILITY_ROUTE_LINK_GET_KERNEL_FAIL_OPNOTSUPP,
NL_CAPABILITY_ROUTE_ADDR_COMPARE_CACHEINFO,
NL_CAPABILITY_VERSION_3_2_26,
NL_CAPABILITY_NL_RECV_FAIL_TRUNC_NO_PEEK),
_NL_SET(1,
NL_CAPABILITY_LINK_BUILD_CHANGE_REQUEST_SET_CHANGE,
NL_CAPABILITY_RTNL_NEIGH_GET_FILTER_AF_UNSPEC_FIX,
NL_CAPABILITY_VERSION_3_2_27,
NL_CAPABILITY_RTNL_LINK_VLAN_PROTOCOL_SERIALZE,
NL_CAPABILITY_RTNL_LINK_PARSE_GRE_REMOTE,
NL_CAPABILITY_RTNL_LINK_VLAN_INGRESS_MAP_CLEAR,
NL_CAPABILITY_RTNL_LINK_VXLAN_IO_COMPARE,
NL_CAPABILITY_NL_OBJECT_DIFF64),
_NL_SET (2,
NL_CAPABILITY_XFRM_SA_KEY_SIZE,
NL_CAPABILITY_RTNL_ADDR_PEER_FIX,
NL_CAPABILITY_VERSION_3_2_28,
NL_CAPABILITY_RTNL_ADDR_PEER_ID_FIX,
NL_CAPABILITY_NL_ADDR_FILL_SOCKADDR,
NL_CAPABILITY_XFRM_SEC_CTX_LEN,
NL_CAPABILITY_LINK_BUILD_ADD_REQUEST_SET_CHANGE,
NL_CAPABILITY_NL_RECVMSGS_PEEK_BY_DEFAULT),
/* IMPORTANT: these capability numbers are intended to be universal and stable
* for libnl3. Don't allocate new numbers on your own that differ from upstream
* libnl3.
*
* Instead register a capability number upstream too. We will take patches
* for that. We especially take patches to register a capability number that is
* only implemented in your fork of libnl3.
*
* If you really don't want that, use capabilities in the range 0x7000 to 0x7FFF.
* (NL_CAPABILITY_IS_USER_RESERVED). Upstream libnl3 will not register conflicting
* capabilities in that range.
*
* Obviously, only backport capability numbers to libnl versions that actually
* implement that capability as well. */
#undef _NL_SET
#undef _NL_SETV
#undef _NL_ASSERT
};
if (capability <= 0 || capability > NL_CAPABILITY_MAX)
return 0;
capability--;
return (caps[capability / 8] & (1 << (capability % 8))) != 0;
}
/** @endcond */
/** @} */
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