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libnl/lib/route/link.c
Thomas Graf 3040a1d625 Export interface to define caches 
This interface was internal so far which required all code defining
caches to be compiled with the sources available.

In order to simplify the interface, the co_msg_parser prototype was
changed to take the struct nl_parser_param directly instead of a
void *. It used to be void * because the co_msg_parser was directly
passed as the NL_CB_VALID callback function.
2007-09-17 13:36:16 +02:00

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/*
* lib/route/link.c Links (Interfaces)
*
* 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) 2003-2006 Thomas Graf <tgraf@suug.ch>
*/
/**
* @ingroup rtnl
* @defgroup link Links (Interfaces)
* @brief
*
* @par Link Identification
* A link can be identified by either its interface index or by its
* name. The kernel favours the interface index but falls back to the
* interface name if the interface index is lesser-than 0 for kernels
* >= 2.6.11. Therefore you can request changes without mapping a
* interface name to the corresponding index first.
*
* @par Changeable Attributes
* @anchor link_changeable
* - Link layer address
* - Link layer broadcast address
* - device mapping (ifmap) (>= 2.6.9)
* - MTU (>= 2.6.9)
* - Transmission queue length (>= 2.6.9)
* - Weight (>= 2.6.9)
* - Link name (only via access through interface index) (>= 2.6.9)
* - Flags (>= 2.6.9)
* - IFF_DEBUG
* - IFF_NOTRAILERS
* - IFF_NOARP
* - IFF_DYNAMIC
* - IFF_MULTICAST
* - IFF_PORTSEL
* - IFF_AUTOMEDIA
* - IFF_UP
* - IFF_PROMISC
* - IFF_ALLMULTI
*
* @par Link Flags (linux/if.h)
* @anchor link_flags
* @code
* IFF_UP Status of link (up|down)
* IFF_BROADCAST Indicates this link allows broadcasting
* IFF_MULTICAST Indicates this link allows multicasting
* IFF_ALLMULTI Indicates this link is doing multicast routing
* IFF_DEBUG Tell the driver to do debugging (currently unused)
* IFF_LOOPBACK This is the loopback link
* IFF_POINTOPOINT Point-to-point link
* IFF_NOARP Link is unable to perform ARP
* IFF_PROMISC Status of promiscious mode flag
* IFF_MASTER Used by teql
* IFF_SLAVE Used by teql
* IFF_PORTSEL Indicates this link allows port selection
* IFF_AUTOMEDIA Indicates this link selects port automatically
* IFF_DYNAMIC Indicates the address of this link is dynamic
* IFF_RUNNING Link is running and carrier is ok.
* IFF_NOTRAILERS Unused, BSD compat.
* @endcode
*
* @par Notes on IFF_PROMISC and IFF_ALLMULTI flags
* Although you can query the status of IFF_PROMISC and IFF_ALLMULTI
* they do not represent the actual state in the kernel but rather
* whether the flag has been enabled/disabled by userspace. The link
* may be in promiscious mode even if IFF_PROMISC is not set in a link
* dump request response because promiscity might be needed by the driver
* for a period of time.
*
* @note The unit of the transmission queue length depends on the
* link type, a common unit is \a packets.
*
* @par 1) Retrieving information about available links
* @code
* // The first step is to retrieve a list of all available interfaces within
* // the kernel and put them into a cache.
* struct nl_cache *cache = rtnl_link_alloc_cache(nl_handle);
*
* // In a second step, a specific link may be looked up by either interface
* // index or interface name.
* struct rtnl_link *link = rtnl_link_get_by_name(cache, "lo");
*
* // rtnl_link_get_by_name() is the short version for translating the
* // interface name to an interface index first like this:
* int ifindex = rtnl_link_name2i(cache, "lo");
* struct rtnl_link *link = rtnl_link_get(cache, ifindex);
*
* // After successful usage, the object must be given back to the cache
* rtnl_link_put(link);
* @endcode
*
* @par 2) Changing link attributes
* @code
* // In order to change any attributes of an existing link, we must allocate
* // a new link to hold the change requests:
* struct rtnl_link *request = rtnl_link_alloc();
*
* // Now we can go on and specify the attributes we want to change:
* rtnl_link_set_weight(request, 300);
* rtnl_link_set_mtu(request, 1360);
*
* // We can also shut an interface down administratively
* rtnl_link_unset_flags(request, rtnl_link_str2flags("up"));
*
* // Actually, we should know which link to change, so let's look it up
* struct rtnl_link *old = rtnl_link_get(cache, "eth0");
*
* // Two ways exist to commit this change request, the first one is to
* // build the required netlink message and send it out in one single
* // step:
* rtnl_link_change(nl_handle, old, request);
*
* // An alternative way is to build the netlink message and send it
* // out yourself using nl_send_auto_complete()
* struct nl_msg *msg = rtnl_link_build_change_request(old, request);
* nl_send_auto_complete(nl_handle, nlmsg_hdr(msg));
* nlmsg_free(msg);
*
* // Don't forget to give back the link object ;->
* rtnl_link_put(old);
* @endcode
* @{
*/
#include <netlink-local.h>
#include <netlink/netlink.h>
#include <netlink/attr.h>
#include <netlink/utils.h>
#include <netlink/object.h>
#include <netlink/route/rtnl.h>
#include <netlink/route/link.h>
/** @cond SKIP */
#define LINK_ATTR_MTU 0x0001
#define LINK_ATTR_LINK 0x0002
#define LINK_ATTR_TXQLEN 0x0004
#define LINK_ATTR_WEIGHT 0x0008
#define LINK_ATTR_MASTER 0x0010
#define LINK_ATTR_QDISC 0x0020
#define LINK_ATTR_MAP 0x0040
#define LINK_ATTR_ADDR 0x0080
#define LINK_ATTR_BRD 0x0100
#define LINK_ATTR_FLAGS 0x0200
#define LINK_ATTR_IFNAME 0x0400
#define LINK_ATTR_IFINDEX 0x0800
#define LINK_ATTR_FAMILY 0x1000
#define LINK_ATTR_ARPTYPE 0x2000
#define LINK_ATTR_STATS 0x4000
#define LINK_ATTR_CHANGE 0x8000
static struct nl_cache_ops rtnl_link_ops;
static struct nl_object_ops link_obj_ops;
/** @endcond */
static void link_free_data(struct nl_object *c)
{
struct rtnl_link *link = nl_object_priv(c);
if (link) {
nl_addr_put(link->l_addr);
nl_addr_put(link->l_bcast);
}
}
static int link_clone(struct nl_object *_dst, struct nl_object *_src)
{
struct rtnl_link *dst = nl_object_priv(_dst);
struct rtnl_link *src = nl_object_priv(_src);
if (src->l_addr)
if (!(dst->l_addr = nl_addr_clone(src->l_addr)))
goto errout;
if (src->l_bcast)
if (!(dst->l_bcast = nl_addr_clone(src->l_bcast)))
goto errout;
return 0;
errout:
return nl_get_errno();
}
static struct nla_policy link_policy[IFLA_MAX+1] = {
[IFLA_IFNAME] = { .type = NLA_STRING,
.maxlen = IFNAMSIZ },
[IFLA_MTU] = { .type = NLA_U32 },
[IFLA_TXQLEN] = { .type = NLA_U32 },
[IFLA_LINK] = { .type = NLA_U32 },
[IFLA_WEIGHT] = { .type = NLA_U32 },
[IFLA_MASTER] = { .type = NLA_U32 },
[IFLA_QDISC] = { .type = NLA_STRING,
.maxlen = IFQDISCSIZ },
[IFLA_STATS] = { .minlen = sizeof(struct rtnl_link_stats) },
[IFLA_MAP] = { .minlen = sizeof(struct rtnl_link_ifmap) },
};
static int link_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
struct nlmsghdr *n, struct nl_parser_param *pp)
{
struct rtnl_link *link;
struct ifinfomsg *ifi;
struct nlattr *tb[IFLA_MAX+1];
int err;
link = rtnl_link_alloc();
if (link == NULL) {
err = nl_errno(ENOMEM);
goto errout;
}
link->ce_msgtype = n->nlmsg_type;
err = nlmsg_parse(n, sizeof(*ifi), tb, IFLA_MAX, link_policy);
if (err < 0)
goto errout;
if (tb[IFLA_IFNAME] == NULL) {
err = nl_error(EINVAL, "Missing link name TLV");
goto errout;
}
nla_strlcpy(link->l_name, tb[IFLA_IFNAME], IFNAMSIZ);
ifi = nlmsg_data(n);
link->l_family = ifi->ifi_family;
link->l_arptype = ifi->ifi_type;
link->l_index = ifi->ifi_index;
link->l_flags = ifi->ifi_flags;
link->l_change = ifi->ifi_change;
link->ce_mask = (LINK_ATTR_IFNAME | LINK_ATTR_FAMILY |
LINK_ATTR_ARPTYPE| LINK_ATTR_IFINDEX |
LINK_ATTR_FLAGS | LINK_ATTR_CHANGE);
if (tb[IFLA_STATS]) {
struct rtnl_link_stats *st = nla_data(tb[IFLA_STATS]);
link->l_stats[RTNL_LINK_RX_PACKETS] = st->rx_packets;
link->l_stats[RTNL_LINK_RX_BYTES] = st->rx_bytes;
link->l_stats[RTNL_LINK_RX_ERRORS] = st->rx_errors;
link->l_stats[RTNL_LINK_RX_DROPPED] = st->rx_dropped;
link->l_stats[RTNL_LINK_RX_COMPRESSED] = st->rx_compressed;
link->l_stats[RTNL_LINK_RX_FIFO_ERR] = st->rx_fifo_errors;
link->l_stats[RTNL_LINK_TX_PACKETS] = st->tx_packets;
link->l_stats[RTNL_LINK_TX_BYTES] = st->tx_bytes;
link->l_stats[RTNL_LINK_TX_ERRORS] = st->tx_errors;
link->l_stats[RTNL_LINK_TX_DROPPED] = st->tx_dropped;
link->l_stats[RTNL_LINK_TX_COMPRESSED] = st->tx_compressed;
link->l_stats[RTNL_LINK_TX_FIFO_ERR] = st->tx_fifo_errors;
link->l_stats[RTNL_LINK_RX_LEN_ERR] = st->rx_length_errors;
link->l_stats[RTNL_LINK_RX_OVER_ERR] = st->rx_over_errors;
link->l_stats[RTNL_LINK_RX_CRC_ERR] = st->rx_crc_errors;
link->l_stats[RTNL_LINK_RX_FRAME_ERR] = st->rx_frame_errors;
link->l_stats[RTNL_LINK_RX_MISSED_ERR] = st->rx_missed_errors;
link->l_stats[RTNL_LINK_TX_ABORT_ERR] = st->tx_aborted_errors;
link->l_stats[RTNL_LINK_TX_CARRIER_ERR] = st->tx_carrier_errors;
link->l_stats[RTNL_LINK_TX_HBEAT_ERR] = st->tx_heartbeat_errors;
link->l_stats[RTNL_LINK_TX_WIN_ERR] = st->tx_window_errors;
link->l_stats[RTNL_LINK_MULTICAST] = st->multicast;
link->ce_mask |= LINK_ATTR_STATS;
}
if (tb[IFLA_TXQLEN]) {
link->l_txqlen = nla_get_u32(tb[IFLA_TXQLEN]);
link->ce_mask |= LINK_ATTR_TXQLEN;
}
if (tb[IFLA_MTU]) {
link->l_mtu = nla_get_u32(tb[IFLA_MTU]);
link->ce_mask |= LINK_ATTR_MTU;
}
if (tb[IFLA_ADDRESS]) {
link->l_addr = nla_get_addr(tb[IFLA_ADDRESS], AF_UNSPEC);
if (link->l_addr == NULL)
goto errout;
nl_addr_set_family(link->l_addr,
nl_addr_guess_family(link->l_addr));
link->ce_mask |= LINK_ATTR_ADDR;
}
if (tb[IFLA_BROADCAST]) {
link->l_bcast = nla_get_addr(tb[IFLA_BROADCAST], AF_UNSPEC);
if (link->l_bcast == NULL)
goto errout;
nl_addr_set_family(link->l_bcast,
nl_addr_guess_family(link->l_bcast));
link->ce_mask |= LINK_ATTR_BRD;
}
if (tb[IFLA_LINK]) {
link->l_link = nla_get_u32(tb[IFLA_LINK]);
link->ce_mask |= LINK_ATTR_LINK;
}
if (tb[IFLA_WEIGHT]) {
link->l_weight = nla_get_u32(tb[IFLA_WEIGHT]);
link->ce_mask |= LINK_ATTR_WEIGHT;
}
if (tb[IFLA_QDISC]) {
nla_strlcpy(link->l_qdisc, tb[IFLA_QDISC], IFQDISCSIZ);
link->ce_mask |= LINK_ATTR_QDISC;
}
if (tb[IFLA_MAP]) {
struct rtnl_link_ifmap *map = nla_data(tb[IFLA_MAP]);
link->l_map.lm_mem_start = map->mem_start;
link->l_map.lm_mem_end = map->mem_end;
link->l_map.lm_base_addr = map->base_addr;
link->l_map.lm_irq = map->irq;
link->l_map.lm_dma = map->dma;
link->l_map.lm_port = map->port;
link->ce_mask |= LINK_ATTR_MAP;
}
if (tb[IFLA_MASTER]) {
link->l_master = nla_get_u32(tb[IFLA_MASTER]);
link->ce_mask |= LINK_ATTR_MASTER;
}
err = pp->pp_cb((struct nl_object *) link, pp);
if (err < 0)
goto errout;
return P_ACCEPT;
errout:
rtnl_link_put(link);
return err;
}
static int link_request_update(struct nl_cache *c, struct nl_handle *h)
{
return nl_rtgen_request(h, RTM_GETLINK, AF_UNSPEC, NLM_F_DUMP);
}
static int link_dump_brief(struct nl_object *obj, struct nl_dump_params *p)
{
char buf[128];
struct nl_cache *cache = dp_cache(obj);
struct rtnl_link *link = (struct rtnl_link *) obj;
int line = 1;
dp_dump(p, "%s ", link->l_name);
if (link->ce_mask & LINK_ATTR_LINK) {
struct rtnl_link *ll = rtnl_link_get(cache, link->l_link);
dp_dump(p, "@%s", ll ? ll->l_name : "NONE");
if (ll)
rtnl_link_put(ll);
}
dp_dump(p, "%s ", nl_llproto2str(link->l_arptype, buf, sizeof(buf)));
dp_dump(p, "%s ", link->l_addr ? nl_addr2str(link->l_addr, buf,
sizeof(buf)) : "none");
dp_dump(p, "mtu %u ", link->l_mtu);
if (link->ce_mask & LINK_ATTR_MASTER) {
struct rtnl_link *master = rtnl_link_get(cache, link->l_master);
dp_dump(p, "master %s ", master ? master->l_name : "inv");
if (master)
rtnl_link_put(master);
}
rtnl_link_flags2str(link->l_flags, buf, sizeof(buf));
if (buf[0])
dp_dump(p, "<%s>", buf);
dp_dump(p, "\n");
return line;
}
static int link_dump_full(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_link *link = (struct rtnl_link *) obj;
char buf[64];
int line;
line = link_dump_brief(obj, p);
dp_new_line(p, line++);
dp_dump(p, " txqlen %u weight %u ", link->l_txqlen, link->l_weight);
if (link->ce_mask & LINK_ATTR_QDISC)
dp_dump(p, "qdisc %s ", link->l_qdisc);
if (link->ce_mask & LINK_ATTR_MAP && link->l_map.lm_irq)
dp_dump(p, "irq %u ", link->l_map.lm_irq);
if (link->ce_mask & LINK_ATTR_IFINDEX)
dp_dump(p, "index %u ", link->l_index);
if (link->ce_mask & LINK_ATTR_BRD)
dp_dump(p, "brd %s", nl_addr2str(link->l_bcast, buf,
sizeof(buf)));
dp_dump(p, "\n");
return line;
}
static int link_dump_stats(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_link *link = (struct rtnl_link *) obj;
char *unit, fmt[64];
float res;
int line;
line = link_dump_full(obj, p);
dp_dump_line(p, line++, " Stats: bytes packets errors "
" dropped fifo-err compressed\n");
res = nl_cancel_down_bytes(link->l_stats[RTNL_LINK_RX_BYTES], &unit);
strcpy(fmt, " RX %X.2f %s %10llu %10llu %10llu %10llu %10llu\n");
fmt[9] = *unit == 'B' ? '9' : '7';
dp_dump_line(p, line++, fmt,
res, unit,
link->l_stats[RTNL_LINK_RX_PACKETS],
link->l_stats[RTNL_LINK_RX_ERRORS],
link->l_stats[RTNL_LINK_RX_DROPPED],
link->l_stats[RTNL_LINK_RX_FIFO_ERR],
link->l_stats[RTNL_LINK_RX_COMPRESSED]);
res = nl_cancel_down_bytes(link->l_stats[RTNL_LINK_TX_BYTES], &unit);
strcpy(fmt, " TX %X.2f %s %10llu %10llu %10llu %10llu %10llu\n");
fmt[9] = *unit == 'B' ? '9' : '7';
dp_dump_line(p, line++, fmt,
res, unit,
link->l_stats[RTNL_LINK_TX_PACKETS],
link->l_stats[RTNL_LINK_TX_ERRORS],
link->l_stats[RTNL_LINK_TX_DROPPED],
link->l_stats[RTNL_LINK_TX_FIFO_ERR],
link->l_stats[RTNL_LINK_TX_COMPRESSED]);
dp_dump_line(p, line++, " Errors: length over crc "
" frame missed multicast\n");
dp_dump_line(p, line++, " RX %10" PRIu64 " %10" PRIu64 " %10"
PRIu64 " %10" PRIu64 " %10" PRIu64 " %10"
PRIu64 "\n",
link->l_stats[RTNL_LINK_RX_LEN_ERR],
link->l_stats[RTNL_LINK_RX_OVER_ERR],
link->l_stats[RTNL_LINK_RX_CRC_ERR],
link->l_stats[RTNL_LINK_RX_FRAME_ERR],
link->l_stats[RTNL_LINK_RX_MISSED_ERR],
link->l_stats[RTNL_LINK_MULTICAST]);
dp_dump_line(p, line++, " Errors: aborted carrier heartbeat "
" window collision\n");
dp_dump_line(p, line++, " TX %10" PRIu64 " %10" PRIu64 " %10"
PRIu64 " %10" PRIu64 " %10" PRIu64 "\n",
link->l_stats[RTNL_LINK_TX_ABORT_ERR],
link->l_stats[RTNL_LINK_TX_CARRIER_ERR],
link->l_stats[RTNL_LINK_TX_HBEAT_ERR],
link->l_stats[RTNL_LINK_TX_WIN_ERR],
link->l_stats[RTNL_LINK_TX_COLLISIONS]);
return line;
}
static int link_dump_xml(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_link *link = (struct rtnl_link *) obj;
struct nl_cache *cache = dp_cache(obj);
char buf[128];
int i, line = 0;
dp_dump_line(p, line++, "<link name=\"%s\" index=\"%u\">\n",
link->l_name, link->l_index);
dp_dump_line(p, line++, " <family>%s</family>\n",
nl_af2str(link->l_family, buf, sizeof(buf)));
dp_dump_line(p, line++, " <arptype>%s</arptype>\n",
nl_llproto2str(link->l_arptype, buf, sizeof(buf)));
dp_dump_line(p, line++, " <address>%s</address>\n",
nl_addr2str(link->l_addr, buf, sizeof(buf)));
dp_dump_line(p, line++, " <mtu>%u</mtu>\n", link->l_mtu);
dp_dump_line(p, line++, " <txqlen>%u</txqlen>\n", link->l_txqlen);
dp_dump_line(p, line++, " <weight>%u</weight>\n", link->l_weight);
rtnl_link_flags2str(link->l_flags, buf, sizeof(buf));
if (buf[0])
dp_dump_line(p, line++, " <flags>%s</flags>\n", buf);
if (link->ce_mask & LINK_ATTR_QDISC)
dp_dump_line(p, line++, " <qdisc>%s</qdisc>\n", link->l_qdisc);
if (link->ce_mask & LINK_ATTR_LINK) {
struct rtnl_link *ll = rtnl_link_get(cache, link->l_link);
dp_dump_line(p, line++, " <link>%s</link>\n",
ll ? ll->l_name : "none");
if (ll)
rtnl_link_put(ll);
}
if (link->ce_mask & LINK_ATTR_MASTER) {
struct rtnl_link *master = rtnl_link_get(cache, link->l_master);
dp_dump_line(p, line++, " <master>%s</master>\n",
master ? master->l_name : "none");
if (master)
rtnl_link_put(master);
}
if (link->ce_mask & LINK_ATTR_BRD)
dp_dump_line(p, line++, " <broadcast>%s</broadcast>\n",
nl_addr2str(link->l_bcast, buf, sizeof(buf)));
if (link->ce_mask & LINK_ATTR_STATS) {
dp_dump_line(p, line++, " <stats>\n");
for (i = 0; i <= RTNL_LINK_STATS_MAX; i++) {
rtnl_link_stat2str(i, buf, sizeof(buf));
dp_dump_line(p, line++,
" <%s>%" PRIu64 "</%s>\n",
buf, link->l_stats[i], buf);
}
dp_dump_line(p, line++, " </stats>\n");
}
dp_dump_line(p, line++, "</link>\n");
#if 0
uint32_t l_change; /**< Change mask */
struct rtnl_lifmap l_map; /**< Interface device mapping */
#endif
return line;
}
static int link_dump_env(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_link *link = (struct rtnl_link *) obj;
struct nl_cache *cache = dp_cache(obj);
char buf[128];
int i, line = 0;
dp_dump_line(p, line++, "LINK_NAME=%s\n", link->l_name);
dp_dump_line(p, line++, "LINK_IFINDEX=%u\n", link->l_index);
dp_dump_line(p, line++, "LINK_FAMILY=%s\n",
nl_af2str(link->l_family, buf, sizeof(buf)));
dp_dump_line(p, line++, "LINK_TYPE=%s\n",
nl_llproto2str(link->l_arptype, buf, sizeof(buf)));
if (link->ce_mask & LINK_ATTR_ADDR)
dp_dump_line(p, line++, "LINK_ADDRESS=%s\n",
nl_addr2str(link->l_addr, buf, sizeof(buf)));
dp_dump_line(p, line++, "LINK_MTU=%u\n", link->l_mtu);
dp_dump_line(p, line++, "LINK_TXQUEUELEN=%u\n", link->l_txqlen);
dp_dump_line(p, line++, "LINK_WEIGHT=%u\n", link->l_weight);
rtnl_link_flags2str(link->l_flags & ~IFF_RUNNING, buf, sizeof(buf));
if (buf[0])
dp_dump_line(p, line++, "LINK_FLAGS=%s\n", buf);
if (link->ce_mask & LINK_ATTR_QDISC)
dp_dump_line(p, line++, "LINK_QDISC=%s\n", link->l_qdisc);
if (link->ce_mask & LINK_ATTR_LINK) {
struct rtnl_link *ll = rtnl_link_get(cache, link->l_link);
dp_dump_line(p, line++, "LINK_LINK_IFINDEX=%d\n", link->l_link);
if (ll) {
dp_dump_line(p, line++, "LINK_LINK_IFNAME=%s\n",
ll->l_name);
rtnl_link_put(ll);
}
}
if (link->ce_mask & LINK_ATTR_MASTER) {
struct rtnl_link *master = rtnl_link_get(cache, link->l_master);
dp_dump_line(p, line++, "LINK_MASTER=%s\n",
master ? master->l_name : "none");
if (master)
rtnl_link_put(master);
}
if (link->ce_mask & LINK_ATTR_BRD)
dp_dump_line(p, line++, "LINK_BROADCAST=%s\n",
nl_addr2str(link->l_bcast, buf, sizeof(buf)));
if (link->ce_mask & LINK_ATTR_STATS) {
for (i = 0; i <= RTNL_LINK_STATS_MAX; i++) {
char *c = buf;
sprintf(buf, "LINK_");
rtnl_link_stat2str(i, buf + 5, sizeof(buf) - 5);
while (*c) {
*c = toupper(*c);
c++;
}
dp_dump_line(p, line++,
"%s=%" PRIu64 "\n", buf, link->l_stats[i]);
}
}
return line;
}
#if 0
static int link_handle_event(struct nl_object *a, struct rtnl_link_event_cb *cb)
{
struct rtnl_link *l = (struct rtnl_link *) a;
struct nl_cache *c = dp_cache(a);
int nevents = 0;
if (l->l_change == ~0U) {
if (l->ce_msgtype == RTM_NEWLINK)
cb->le_register(l);
else
cb->le_unregister(l);
return 1;
}
if (l->l_change & IFF_SLAVE) {
if (l->l_flags & IFF_SLAVE) {
struct rtnl_link *m = rtnl_link_get(c, l->l_master);
cb->le_new_bonding(l, m);
if (m)
rtnl_link_put(m);
} else
cb->le_cancel_bonding(l);
}
#if 0
if (l->l_change & IFF_UP && l->l_change & IFF_RUNNING)
dp_dump_line(p, line++, "link %s changed state to %s.\n",
l->l_name, l->l_flags & IFF_UP ? "up" : "down");
if (l->l_change & IFF_PROMISC) {
dp_new_line(p, line++);
dp_dump(p, "link %s %s promiscuous mode.\n",
l->l_name, l->l_flags & IFF_PROMISC ? "entered" : "left");
}
if (line == 0)
dp_dump_line(p, line++, "link %s sent unknown event.\n",
l->l_name);
#endif
return nevents;
}
#endif
static int link_compare(struct nl_object *_a, struct nl_object *_b,
uint32_t attrs, int flags)
{
struct rtnl_link *a = (struct rtnl_link *) _a;
struct rtnl_link *b = (struct rtnl_link *) _b;
int diff = 0;
#define LINK_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, LINK_ATTR_##ATTR, a, b, EXPR)
diff |= LINK_DIFF(IFINDEX, a->l_index != b->l_index);
diff |= LINK_DIFF(MTU, a->l_mtu != b->l_mtu);
diff |= LINK_DIFF(LINK, a->l_link != b->l_link);
diff |= LINK_DIFF(TXQLEN, a->l_txqlen != b->l_txqlen);
diff |= LINK_DIFF(WEIGHT, a->l_weight != b->l_weight);
diff |= LINK_DIFF(MASTER, a->l_master != b->l_master);
diff |= LINK_DIFF(FAMILY, a->l_family != b->l_family);
diff |= LINK_DIFF(QDISC, strcmp(a->l_qdisc, b->l_qdisc));
diff |= LINK_DIFF(IFNAME, strcmp(a->l_name, b->l_name));
diff |= LINK_DIFF(ADDR, nl_addr_cmp(a->l_addr, b->l_addr));
diff |= LINK_DIFF(BRD, nl_addr_cmp(a->l_bcast, b->l_bcast));
if (flags & LOOSE_FLAG_COMPARISON)
diff |= LINK_DIFF(FLAGS,
(a->l_flags ^ b->l_flags) & b->l_flag_mask);
else
diff |= LINK_DIFF(FLAGS, a->l_flags != b->l_flags);
#undef LINK_DIFF
return diff;
}
static struct trans_tbl link_attrs[] = {
__ADD(LINK_ATTR_MTU, mtu)
__ADD(LINK_ATTR_LINK, link)
__ADD(LINK_ATTR_TXQLEN, txqlen)
__ADD(LINK_ATTR_WEIGHT, weight)
__ADD(LINK_ATTR_MASTER, master)
__ADD(LINK_ATTR_QDISC, qdisc)
__ADD(LINK_ATTR_MAP, map)
__ADD(LINK_ATTR_ADDR, address)
__ADD(LINK_ATTR_BRD, broadcast)
__ADD(LINK_ATTR_FLAGS, flags)
__ADD(LINK_ATTR_IFNAME, name)
__ADD(LINK_ATTR_IFINDEX, ifindex)
__ADD(LINK_ATTR_FAMILY, family)
__ADD(LINK_ATTR_ARPTYPE, arptype)
__ADD(LINK_ATTR_STATS, stats)
__ADD(LINK_ATTR_CHANGE, change)
};
static char *link_attrs2str(int attrs, char *buf, size_t len)
{
return __flags2str(attrs, buf, len, link_attrs,
ARRAY_SIZE(link_attrs));
}
/**
* @name Allocation/Freeing
* @{
*/
struct rtnl_link *rtnl_link_alloc(void)
{
return (struct rtnl_link *) nl_object_alloc(&link_obj_ops);
}
void rtnl_link_put(struct rtnl_link *link)
{
nl_object_put((struct nl_object *) link);
}
/** @} */
/**
* @name Cache Management
* @{
*/
/**
* Allocate link cache and fill in all configured links.
* @arg handle Netlink handle.
*
* Allocates a new link cache, initializes it properly and updates it
* to include all links currently configured in the kernel.
*
* @note Free the memory after usage.
* @return Newly allocated cache or NULL if an error occured.
*/
struct nl_cache *rtnl_link_alloc_cache(struct nl_handle *handle)
{
struct nl_cache * cache;
cache = nl_cache_alloc(&rtnl_link_ops);
if (cache == NULL)
return NULL;
if (handle && nl_cache_refill(handle, cache) < 0) {
nl_cache_free(cache);
return NULL;
}
return cache;
}
/**
* Look up link by interface index in the provided cache
* @arg cache link cache
* @arg ifindex link interface index
*
* The caller owns a reference on the returned object and
* must give the object back via rtnl_link_put().
*
* @return pointer to link inside the cache or NULL if no match was found.
*/
struct rtnl_link *rtnl_link_get(struct nl_cache *cache, int ifindex)
{
struct rtnl_link *link;
if (cache->c_ops != &rtnl_link_ops)
return NULL;
nl_list_for_each_entry(link, &cache->c_items, ce_list) {
if (link->l_index == ifindex) {
nl_object_get((struct nl_object *) link);
return link;
}
}
return NULL;
}
/**
* Look up link by link name in the provided cache
* @arg cache link cache
* @arg name link name
*
* The caller owns a reference on the returned object and
* must give the object back via rtnl_link_put().
*
* @return pointer to link inside the cache or NULL if no match was found.
*/
struct rtnl_link *rtnl_link_get_by_name(struct nl_cache *cache,
const char *name)
{
struct rtnl_link *link;
if (cache->c_ops != &rtnl_link_ops)
return NULL;
nl_list_for_each_entry(link, &cache->c_items, ce_list) {
if (!strcmp(name, link->l_name)) {
nl_object_get((struct nl_object *) link);
return link;
}
}
return NULL;
}
/** @} */
/**
* @name Link Modifications
* @{
*/
/**
* Builds a netlink change request message to change link attributes
* @arg old link to be changed
* @arg tmpl template with requested changes
* @arg flags additional netlink message flags
*
* Builds a new netlink message requesting a change of link attributes.
* The netlink message header isn't fully equipped with all relevant
* fields and must be sent out via nl_send_auto_complete() or
* supplemented as needed.
* \a old must point to a link currently configured in the kernel
* and \a tmpl must contain the attributes to be changed set via
* \c rtnl_link_set_* functions.
*
* @return New netlink message
* @note Not all attributes can be changed, see
* \ref link_changeable "Changeable Attributes" for more details.
*/
struct nl_msg * rtnl_link_build_change_request(struct rtnl_link *old,
struct rtnl_link *tmpl,
int flags)
{
struct nl_msg *msg;
struct ifinfomsg ifi = {
.ifi_family = old->l_family,
.ifi_index = old->l_index,
};
if (tmpl->ce_mask & LINK_ATTR_FLAGS) {
ifi.ifi_flags = old->l_flags & ~tmpl->l_flag_mask;
ifi.ifi_flags |= tmpl->l_flags;
}
msg = nlmsg_alloc_simple(RTM_SETLINK, flags);
if (!msg)
goto nla_put_failure;
if (nlmsg_append(msg, &ifi, sizeof(ifi), NLMSG_ALIGNTO) < 0)
goto nla_put_failure;
if (tmpl->ce_mask & LINK_ATTR_ADDR)
NLA_PUT_ADDR(msg, IFLA_ADDRESS, tmpl->l_addr);
if (tmpl->ce_mask & LINK_ATTR_BRD)
NLA_PUT_ADDR(msg, IFLA_BROADCAST, tmpl->l_bcast);
if (tmpl->ce_mask & LINK_ATTR_MTU)
NLA_PUT_U32(msg, IFLA_MTU, tmpl->l_mtu);
if (tmpl->ce_mask & LINK_ATTR_TXQLEN)
NLA_PUT_U32(msg, IFLA_TXQLEN, tmpl->l_txqlen);
if (tmpl->ce_mask & LINK_ATTR_WEIGHT)
NLA_PUT_U32(msg, IFLA_WEIGHT, tmpl->l_weight);
if (tmpl->ce_mask & LINK_ATTR_IFNAME)
NLA_PUT_STRING(msg, IFLA_IFNAME, tmpl->l_name);
return msg;
nla_put_failure:
nlmsg_free(msg);
return NULL;
}
/**
* Change link attributes
* @arg handle netlink handle
* @arg old link to be changed
* @arg tmpl template with requested changes
* @arg flags additional netlink message flags
*
* Builds a new netlink message by calling rtnl_link_build_change_request(),
* sends the request to the kernel and waits for the next ACK to be
* received, i.e. blocks until the request has been processed.
*
* @return 0 on success or a negative error code
* @note Not all attributes can be changed, see
* \ref link_changeable "Changeable Attributes" for more details.
*/
int rtnl_link_change(struct nl_handle *handle, struct rtnl_link *old,
struct rtnl_link *tmpl, int flags)
{
int err;
struct nl_msg *msg;
msg = rtnl_link_build_change_request(old, tmpl, flags);
if (!msg)
return nl_errno(ENOMEM);
err = nl_send_auto_complete(handle, msg);
if (err < 0)
return err;
nlmsg_free(msg);
return nl_wait_for_ack(handle);
}
/** @} */
/**
* @name Name <-> Index Translations
* @{
*/
/**
* Translate an interface index to the corresponding link name
* @arg cache link cache
* @arg ifindex link interface index
* @arg dst destination buffer
* @arg len length of destination buffer
*
* Translates the specified interface index to the corresponding
* link name and stores the name in the destination buffer.
*
* @return link name or NULL if no match was found.
*/
char * rtnl_link_i2name(struct nl_cache *cache, int ifindex, char *dst,
size_t len)
{
struct rtnl_link *link = rtnl_link_get(cache, ifindex);
if (link) {
strncpy(dst, link->l_name, len - 1);
rtnl_link_put(link);
return dst;
}
return NULL;
}
/**
* Translate a link name to the corresponding interface index
* @arg cache link cache
* @arg name link name
*
* @return interface index or RTNL_LINK_NOT_FOUND if no match was found.
*/
int rtnl_link_name2i(struct nl_cache *cache, const char *name)
{
int ifindex = RTNL_LINK_NOT_FOUND;
struct rtnl_link *link;
link = rtnl_link_get_by_name(cache, name);
if (link) {
ifindex = link->l_index;
rtnl_link_put(link);
}
return ifindex;
}
/** @} */
/**
* @name Link Flags Translations
* @{
*/
static struct trans_tbl link_flags[] = {
__ADD(IFF_LOOPBACK, loopback)
__ADD(IFF_BROADCAST, broadcast)
__ADD(IFF_POINTOPOINT, pointopoint)
__ADD(IFF_MULTICAST, multicast)
__ADD(IFF_NOARP, noarp)
__ADD(IFF_ALLMULTI, allmulti)
__ADD(IFF_PROMISC, promisc)
__ADD(IFF_MASTER, master)
__ADD(IFF_SLAVE, slave)
__ADD(IFF_DEBUG, debug)
__ADD(IFF_DYNAMIC, dynamic)
__ADD(IFF_AUTOMEDIA, automedia)
__ADD(IFF_PORTSEL, portsel)
__ADD(IFF_NOTRAILERS, notrailers)
__ADD(IFF_UP, up)
__ADD(IFF_RUNNING, running)
__ADD(IFF_LOWER_UP, lowerup)
__ADD(IFF_DORMANT, dormant)
};
char * rtnl_link_flags2str(int flags, char *buf, size_t len)
{
return __flags2str(flags, buf, len, link_flags,
ARRAY_SIZE(link_flags));
}
int rtnl_link_str2flags(const char *name)
{
return __str2flags(name, link_flags, ARRAY_SIZE(link_flags));
}
/** @} */
/**
* @name Link Statistics Translations
* @{
*/
static struct trans_tbl link_stats[] = {
__ADD(RTNL_LINK_RX_PACKETS, rx_packets)
__ADD(RTNL_LINK_TX_PACKETS, tx_packets)
__ADD(RTNL_LINK_RX_BYTES, rx_bytes)
__ADD(RTNL_LINK_TX_BYTES, tx_bytes)
__ADD(RTNL_LINK_RX_ERRORS, rx_errors)
__ADD(RTNL_LINK_TX_ERRORS, tx_errors)
__ADD(RTNL_LINK_RX_DROPPED, rx_dropped)
__ADD(RTNL_LINK_TX_DROPPED, tx_dropped)
__ADD(RTNL_LINK_RX_COMPRESSED, rx_compressed)
__ADD(RTNL_LINK_TX_COMPRESSED, tx_compressed)
__ADD(RTNL_LINK_RX_FIFO_ERR, rx_fifo_err)
__ADD(RTNL_LINK_TX_FIFO_ERR, tx_fifo_err)
__ADD(RTNL_LINK_RX_LEN_ERR, rx_len_err)
__ADD(RTNL_LINK_RX_OVER_ERR, rx_over_err)
__ADD(RTNL_LINK_RX_CRC_ERR, rx_crc_err)
__ADD(RTNL_LINK_RX_FRAME_ERR, rx_frame_err)
__ADD(RTNL_LINK_RX_MISSED_ERR, rx_missed_err)
__ADD(RTNL_LINK_TX_ABORT_ERR, tx_abort_err)
__ADD(RTNL_LINK_TX_CARRIER_ERR, tx_carrier_err)
__ADD(RTNL_LINK_TX_HBEAT_ERR, tx_hbeat_err)
__ADD(RTNL_LINK_TX_WIN_ERR, tx_win_err)
__ADD(RTNL_LINK_TX_COLLISIONS, tx_collision)
__ADD(RTNL_LINK_MULTICAST, multicast)
};
char *rtnl_link_stat2str(int st, char *buf, size_t len)
{
return __type2str(st, buf, len, link_stats, ARRAY_SIZE(link_stats));
}
int rtnl_link_str2stat(const char *name)
{
return __str2type(name, link_stats, ARRAY_SIZE(link_stats));
}
/** @} */
/**
* @name Attributes
* @{
*/
void rtnl_link_set_qdisc(struct rtnl_link *link, const char *qdisc)
{
strncpy(link->l_qdisc, qdisc, sizeof(link->l_qdisc) - 1);
link->ce_mask |= LINK_ATTR_QDISC;
}
char *rtnl_link_get_qdisc(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_QDISC)
return link->l_qdisc;
else
return NULL;
}
void rtnl_link_set_name(struct rtnl_link *link, const char *name)
{
strncpy(link->l_name, name, sizeof(link->l_name) - 1);
link->ce_mask |= LINK_ATTR_IFNAME;
}
char *rtnl_link_get_name(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_IFNAME)
return link->l_name;
else
return NULL;
}
static inline void __assign_addr(struct rtnl_link *link, struct nl_addr **pos,
struct nl_addr *new, int flag)
{
if (*pos)
nl_addr_put(*pos);
nl_addr_get(new);
*pos = new;
link->ce_mask |= flag;
}
void rtnl_link_set_addr(struct rtnl_link *link, struct nl_addr *addr)
{
__assign_addr(link, &link->l_addr, addr, LINK_ATTR_ADDR);
}
struct nl_addr *rtnl_link_get_addr(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_ADDR)
return link->l_addr;
else
return NULL;
}
void rtnl_link_set_broadcast(struct rtnl_link *link, struct nl_addr *brd)
{
__assign_addr(link, &link->l_bcast, brd, LINK_ATTR_BRD);
}
struct nl_addr *rtnl_link_get_broadcast(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_BRD)
return link->l_bcast;
else
return NULL;
}
void rtnl_link_set_flags(struct rtnl_link *link, unsigned int flags)
{
link->l_flag_mask |= flags;
link->l_flags |= flags;
link->ce_mask |= LINK_ATTR_FLAGS;
}
void rtnl_link_unset_flags(struct rtnl_link *link, unsigned int flags)
{
link->l_flag_mask |= flags;
link->l_flags &= ~flags;
link->ce_mask |= LINK_ATTR_FLAGS;
}
unsigned int rtnl_link_get_flags(struct rtnl_link *link)
{
return link->l_flags;
}
void rtnl_link_set_family(struct rtnl_link *link, int family)
{
link->l_family = family;
link->ce_mask |= LINK_ATTR_FAMILY;
}
int rtnl_link_get_family(struct rtnl_link *link)
{
if (link->l_family & LINK_ATTR_FAMILY)
return link->l_family;
else
return AF_UNSPEC;
}
void rtnl_link_set_arptype(struct rtnl_link *link, unsigned int arptype)
{
link->l_arptype = arptype;
}
unsigned int rtnl_link_get_arptype(struct rtnl_link *link)
{
return link->l_arptype;
}
void rtnl_link_set_ifindex(struct rtnl_link *link, int ifindex)
{
link->l_index = ifindex;
link->ce_mask |= LINK_ATTR_IFINDEX;
}
int rtnl_link_get_ifindex(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_IFINDEX)
return link->l_index;
else
return RTNL_LINK_NOT_FOUND;
}
void rtnl_link_set_mtu(struct rtnl_link *link, unsigned int mtu)
{
link->l_mtu = mtu;
link->ce_mask |= LINK_ATTR_MTU;
}
unsigned int rtnl_link_get_mtu(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_MTU)
return link->l_mtu;
else
return 0;
}
void rtnl_link_set_txqlen(struct rtnl_link *link, unsigned int txqlen)
{
link->l_txqlen = txqlen;
link->ce_mask |= LINK_ATTR_TXQLEN;
}
unsigned int rtnl_link_get_txqlen(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_TXQLEN)
return link->l_txqlen;
else
return UINT_MAX;
}
void rtnl_link_set_weight(struct rtnl_link *link, unsigned int weight)
{
link->l_weight = weight;
link->ce_mask |= LINK_ATTR_WEIGHT;
}
unsigned int rtnl_link_get_weight(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_WEIGHT)
return link->l_weight;
else
return UINT_MAX;
}
void rtnl_link_set_link(struct rtnl_link *link, int ifindex)
{
link->l_link = ifindex;
link->ce_mask |= LINK_ATTR_LINK;
}
int rtnl_link_get_link(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_LINK)
return link->l_link;
else
return RTNL_LINK_NOT_FOUND;
}
void rtnl_link_set_master(struct rtnl_link *link, int ifindex)
{
link->l_master = ifindex;
link->ce_mask |= LINK_ATTR_MASTER;
}
int rtnl_link_get_master(struct rtnl_link *link)
{
if (link->ce_mask & LINK_ATTR_MASTER)
return link->l_master;
else
return RTNL_LINK_NOT_FOUND;
}
uint64_t rtnl_link_get_stat(struct rtnl_link *link, int id)
{
if (id < 0 || id > RTNL_LINK_STATS_MAX)
return 0;
return link->l_stats[id];
}
/** @} */
static struct nl_object_ops link_obj_ops = {
.oo_name = "route/link",
.oo_size = sizeof(struct rtnl_link),
.oo_free_data = link_free_data,
.oo_clone = link_clone,
.oo_dump[NL_DUMP_BRIEF] = link_dump_brief,
.oo_dump[NL_DUMP_FULL] = link_dump_full,
.oo_dump[NL_DUMP_STATS] = link_dump_stats,
.oo_dump[NL_DUMP_XML] = link_dump_xml,
.oo_dump[NL_DUMP_ENV] = link_dump_env,
.oo_compare = link_compare,
.oo_attrs2str = link_attrs2str,
.oo_id_attrs = LINK_ATTR_IFINDEX,
};
static struct nl_af_group link_groups[] = {
{ AF_UNSPEC, RTNLGRP_LINK },
{ END_OF_GROUP_LIST },
};
static struct nl_cache_ops rtnl_link_ops = {
.co_name = "route/link",
.co_hdrsize = sizeof(struct ifinfomsg),
.co_msgtypes = {
{ RTM_NEWLINK, NL_ACT_NEW, "new" },
{ RTM_DELLINK, NL_ACT_DEL, "del" },
{ RTM_GETLINK, NL_ACT_GET, "get" },
END_OF_MSGTYPES_LIST,
},
.co_protocol = NETLINK_ROUTE,
.co_groups = link_groups,
.co_request_update = link_request_update,
.co_msg_parser = link_msg_parser,
.co_obj_ops = &link_obj_ops,
};
static void __init link_init(void)
{
nl_cache_mngt_register(&rtnl_link_ops);
}
static void __exit link_exit(void)
{
nl_cache_mngt_unregister(&rtnl_link_ops);
}
/** @} */
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