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libnl/lib/route/addr.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

1129 lines
30 KiB
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/*
* lib/route/addr.c Addresses
*
* 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>
* Baruch Even <baruch@ev-en.org>,
* Mediatrix Telecom, inc. <ericb@mediatrix.com>
*/
/**
* @ingroup rtnl
* @defgroup rtaddr Addresses
* @brief
*
* @note The maximum size of an address label is IFNAMSIZ.
*
* @note The address may not contain a prefix length if the peer address
* has been specified already.
*
* @par 1) Address Addition
* @code
* // Allocate an empty address object to be filled out with the attributes
* // of the new address.
* struct rtnl_addr *addr = rtnl_addr_alloc();
*
* // Fill out the mandatory attributes of the new address. Setting the
* // local address will automatically set the address family and the
* // prefix length to the correct values.
* rtnl_addr_set_ifindex(addr, ifindex);
* rtnl_addr_set_local(addr, local_addr);
*
* // The label of the address can be specified, currently only supported
* // by IPv4 and DECnet.
* rtnl_addr_set_label(addr, "mylabel");
*
* // The peer address can be specified if necessary, in either case a peer
* // address will be sent to the kernel in order to fullfil the interface
* // requirements. If none is set, it will equal the local address.
* // Note: Real peer addresses are only supported by IPv4 for now.
* rtnl_addr_set_peer(addr, peer_addr);
*
* // In case you want to have the address have a scope other than global
* // it may be overwritten using rtnl_addr_set_scope(). The scope currently
* // cannot be set for IPv6 addresses.
* rtnl_addr_set_scope(addr, rtnl_str2scope("site"));
*
* // Broadcast and anycast address may be specified using the relevant
* // functions, the address family will be verified if one of the other
* // addresses has been set already. Currently only works for IPv4.
* rtnl_addr_set_broadcast(addr, broadcast_addr);
* rtnl_addr_set_anycast(addr, anycast_addr);
*
* // Build the netlink message and send it to the kernel, the operation will
* // block until the operation has been completed. Alternatively the required
* // netlink message can be built using rtnl_addr_build_add_request() to be
* // sent out using nl_send_auto_complete().
* rtnl_addr_add(handle, addr, 0);
*
* // Free the memory
* rtnl_addr_put(addr);
* @endcode
*
* @par 2) Address Deletion
* @code
* // Allocate an empty address object to be filled out with the attributes
* // matching the address to be deleted. Alternatively a fully equipped
* // address object out of a cache can be used instead.
* struct rtnl_addr *addr = rtnl_addr_alloc();
*
* // The only mandatory parameter besides the address family is the interface
* // index the address is on, i.e. leaving out all other parameters will
* // result in all addresses of the specified address family interface tuple
* // to be deleted.
* rtnl_addr_set_ifindex(addr, ifindex);
*
* // Specyfing the address family manually is only required if neither the
* // local nor peer address have been specified.
* rtnl_addr_set_family(addr, AF_INET);
*
* // Specyfing the local address is optional but the best choice to delete
* // specific addresses.
* rtnl_addr_set_local(addr, local_addr);
*
* // The label of the address can be specified, currently only supported
* // by IPv4 and DECnet.
* rtnl_addr_set_label(addr, "mylabel");
*
* // The peer address can be specified if necessary, in either case a peer
* // address will be sent to the kernel in order to fullfil the interface
* // requirements. If none is set, it will equal the local address.
* // Note: Real peer addresses are only supported by IPv4 for now.
* rtnl_addr_set_peer(addr, peer_addr);
*
* // Build the netlink message and send it to the kernel, the operation will
* // block until the operation has been completed. Alternatively the required
* // netlink message can be built using rtnl_addr_build_delete_request()
* // to be sent out using nl_send_auto_complete().
* rtnl_addr_delete(handle, addr, 0);
*
* // Free the memory
* rtnl_addr_put(addr);
* @endcode
* @{
*/
#include <netlink-local.h>
#include <netlink/netlink.h>
#include <netlink/route/rtnl.h>
#include <netlink/route/addr.h>
#include <netlink/route/route.h>
#include <netlink/route/link.h>
#include <netlink/utils.h>
/** @cond SKIP */
#define ADDR_ATTR_FAMILY 0x0001
#define ADDR_ATTR_PREFIXLEN 0x0002
#define ADDR_ATTR_FLAGS 0x0004
#define ADDR_ATTR_SCOPE 0x0008
#define ADDR_ATTR_IFINDEX 0x0010
#define ADDR_ATTR_LABEL 0x0020
#define ADDR_ATTR_CACHEINFO 0x0040
#define ADDR_ATTR_PEER 0x0080
#define ADDR_ATTR_LOCAL 0x0100
#define ADDR_ATTR_BROADCAST 0x0200
#define ADDR_ATTR_ANYCAST 0x0400
#define ADDR_ATTR_MULTICAST 0x0800
static struct nl_cache_ops rtnl_addr_ops;
static struct nl_object_ops addr_obj_ops;
/** @endcond */
static void addr_free_data(struct nl_object *obj)
{
struct rtnl_addr *addr = nl_object_priv(obj);
if (!addr)
return;
nl_addr_put(addr->a_peer);
nl_addr_put(addr->a_local);
nl_addr_put(addr->a_bcast);
nl_addr_put(addr->a_anycast);
nl_addr_put(addr->a_multicast);
}
static int addr_clone(struct nl_object *_dst, struct nl_object *_src)
{
struct rtnl_addr *dst = nl_object_priv(_dst);
struct rtnl_addr *src = nl_object_priv(_src);
if (src->a_peer)
if (!(dst->a_peer = nl_addr_clone(src->a_peer)))
goto errout;
if (src->a_local)
if (!(dst->a_local = nl_addr_clone(src->a_local)))
goto errout;
if (src->a_bcast)
if (!(dst->a_bcast = nl_addr_clone(src->a_bcast)))
goto errout;
if (src->a_anycast)
if (!(dst->a_anycast = nl_addr_clone(src->a_anycast)))
goto errout;
if (src->a_multicast)
if (!(dst->a_multicast = nl_addr_clone(src->a_multicast)))
goto errout;
return 0;
errout:
return nl_get_errno();
}
static struct nla_policy addr_policy[IFA_MAX+1] = {
[IFA_LABEL] = { .type = NLA_STRING,
.maxlen = IFNAMSIZ },
[IFA_CACHEINFO] = { .minlen = sizeof(struct ifa_cacheinfo) },
};
static int addr_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
struct nlmsghdr *nlh, struct nl_parser_param *pp)
{
struct rtnl_addr *addr;
struct ifaddrmsg *ifa;
struct nlattr *tb[IFA_MAX+1];
int err = -ENOMEM, peer_prefix = 0;
addr = rtnl_addr_alloc();
if (!addr) {
err = nl_errno(ENOMEM);
goto errout;
}
addr->ce_msgtype = nlh->nlmsg_type;
err = nlmsg_parse(nlh, sizeof(*ifa), tb, IFA_MAX, addr_policy);
if (err < 0)
goto errout_free;
ifa = nlmsg_data(nlh);
addr->a_family = ifa->ifa_family;
addr->a_prefixlen = ifa->ifa_prefixlen;
addr->a_flags = ifa->ifa_flags;
addr->a_scope = ifa->ifa_scope;
addr->a_ifindex = ifa->ifa_index;
addr->ce_mask = (ADDR_ATTR_FAMILY | ADDR_ATTR_PREFIXLEN |
ADDR_ATTR_FLAGS | ADDR_ATTR_SCOPE | ADDR_ATTR_IFINDEX);
if (tb[IFA_LABEL]) {
nla_strlcpy(addr->a_label, tb[IFA_LABEL], IFNAMSIZ);
addr->ce_mask |= ADDR_ATTR_LABEL;
}
if (tb[IFA_CACHEINFO]) {
struct ifa_cacheinfo *ca;
ca = nla_data(tb[IFA_CACHEINFO]);
addr->a_cacheinfo.aci_prefered = ca->ifa_prefered;
addr->a_cacheinfo.aci_valid = ca->ifa_valid;
addr->a_cacheinfo.aci_cstamp = ca->cstamp;
addr->a_cacheinfo.aci_tstamp = ca->tstamp;
addr->ce_mask |= ADDR_ATTR_CACHEINFO;
}
if (tb[IFA_LOCAL]) {
addr->a_local = nla_get_addr(tb[IFA_LOCAL], addr->a_family);
if (!addr->a_local)
goto errout_free;
addr->ce_mask |= ADDR_ATTR_LOCAL;
}
if (tb[IFA_ADDRESS]) {
struct nl_addr *a;
a = nla_get_addr(tb[IFA_ADDRESS], addr->a_family);
if (!a)
goto errout_free;
/* IPv6 sends the local address as IFA_ADDRESS with
* no IFA_LOCAL, IPv4 sends both IFA_LOCAL and IFA_ADDRESS
* with IFA_ADDRESS being the peer address if they differ */
if (!tb[IFA_LOCAL] || !nl_addr_cmp(a, addr->a_local)) {
nl_addr_put(addr->a_local);
addr->a_local = a;
addr->ce_mask |= ADDR_ATTR_LOCAL;
} else {
addr->a_peer = a;
addr->ce_mask |= ADDR_ATTR_PEER;
peer_prefix = 1;
}
}
nl_addr_set_prefixlen(peer_prefix ? addr->a_peer : addr->a_local,
addr->a_prefixlen);
if (tb[IFA_BROADCAST]) {
addr->a_bcast = nla_get_addr(tb[IFA_BROADCAST], addr->a_family);
if (!addr->a_bcast)
goto errout_free;
addr->ce_mask |= ADDR_ATTR_BROADCAST;
}
if (tb[IFA_ANYCAST]) {
addr->a_anycast = nla_get_addr(tb[IFA_ANYCAST], addr->a_family);
if (!addr->a_anycast)
goto errout_free;
addr->ce_mask |= ADDR_ATTR_ANYCAST;
}
if (tb[IFA_MULTICAST]) {
addr->a_multicast = nla_get_addr(tb[IFA_MULTICAST],
addr->a_family);
if (!addr->a_multicast)
goto errout_free;
addr->ce_mask |= ADDR_ATTR_MULTICAST;
}
err = pp->pp_cb((struct nl_object *) addr, pp);
if (err < 0)
goto errout_free;
return P_ACCEPT;
errout_free:
rtnl_addr_put(addr);
errout:
return err;
}
static int addr_request_update(struct nl_cache *cache, struct nl_handle *handle)
{
return nl_rtgen_request(handle, RTM_GETADDR, AF_UNSPEC, NLM_F_DUMP);
}
static int addr_dump_brief(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_addr *addr = (struct rtnl_addr *) obj;
struct nl_cache *link_cache;
char buf[128];
link_cache = nl_cache_mngt_require("route/link");
if (addr->ce_mask & ADDR_ATTR_LOCAL)
dp_dump(p, "%s",
nl_addr2str(addr->a_local, buf, sizeof(buf)));
else
dp_dump(p, "none");
if (addr->ce_mask & ADDR_ATTR_PEER)
dp_dump(p, " peer %s",
nl_addr2str(addr->a_peer, buf, sizeof(buf)));
dp_dump(p, " %s ", nl_af2str(addr->a_family, buf, sizeof(buf)));
if (link_cache)
dp_dump(p, "dev %s ",
rtnl_link_i2name(link_cache, addr->a_ifindex,
buf, sizeof(buf)));
else
dp_dump(p, "dev %d ", addr->a_ifindex);
dp_dump(p, "scope %s",
rtnl_scope2str(addr->a_scope, buf, sizeof(buf)));
rtnl_addr_flags2str(addr->a_flags, buf, sizeof(buf));
if (buf[0])
dp_dump(p, " <%s>", buf);
dp_dump(p, "\n");
return 1;
}
static int addr_dump_full(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_addr *addr = (struct rtnl_addr *) obj;
int line = addr_dump_brief(obj, p);
char buf[128];
if (addr->ce_mask & (ADDR_ATTR_LABEL | ADDR_ATTR_BROADCAST |
ADDR_ATTR_ANYCAST | ADDR_ATTR_MULTICAST)) {
dp_dump_line(p, line++, " ");
if (addr->ce_mask & ADDR_ATTR_LABEL)
dp_dump(p, " label %s", addr->a_label);
if (addr->ce_mask & ADDR_ATTR_BROADCAST)
dp_dump(p, " broadcast %s",
nl_addr2str(addr->a_bcast, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_ANYCAST)
dp_dump(p, " anycast %s",
nl_addr2str(addr->a_anycast, buf,
sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_MULTICAST)
dp_dump(p, " multicast %s",
nl_addr2str(addr->a_multicast, buf,
sizeof(buf)));
dp_dump(p, "\n");
}
if (addr->ce_mask & ADDR_ATTR_CACHEINFO) {
struct rtnl_addr_cacheinfo *ci = &addr->a_cacheinfo;
dp_dump_line(p, line++, " valid-lifetime %s",
ci->aci_valid == 0xFFFFFFFFU ? "forever" :
nl_msec2str(ci->aci_valid * 1000,
buf, sizeof(buf)));
dp_dump(p, " preferred-lifetime %s\n",
ci->aci_prefered == 0xFFFFFFFFU ? "forever" :
nl_msec2str(ci->aci_prefered * 1000,
buf, sizeof(buf)));
dp_dump_line(p, line++, " created boot-time+%s ",
nl_msec2str(addr->a_cacheinfo.aci_cstamp * 10,
buf, sizeof(buf)));
dp_dump(p, "last-updated boot-time+%s\n",
nl_msec2str(addr->a_cacheinfo.aci_tstamp * 10,
buf, sizeof(buf)));
}
return line;
}
static int addr_dump_stats(struct nl_object *obj, struct nl_dump_params *p)
{
return addr_dump_full(obj, p);
}
static int addr_dump_xml(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_addr *addr = (struct rtnl_addr *) obj;
struct nl_cache *link_cache;
char buf[128];
int line = 0;
dp_dump_line(p, line++, "<address>\n");
dp_dump_line(p, line++, " <family>%s</family>\n",
nl_af2str(addr->a_family, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_LOCAL)
dp_dump_line(p, line++, " <local>%s</local>\n",
nl_addr2str(addr->a_local, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_PEER)
dp_dump_line(p, line++, " <peer>%s</peer>\n",
nl_addr2str(addr->a_peer, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_BROADCAST)
dp_dump_line(p, line++, " <broadcast>%s</broadcast>\n",
nl_addr2str(addr->a_bcast, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_ANYCAST)
dp_dump_line(p, line++, " <anycast>%s</anycast>\n",
nl_addr2str(addr->a_anycast, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_MULTICAST)
dp_dump_line(p, line++, " <multicast>%s</multicast>\n",
nl_addr2str(addr->a_multicast, buf,
sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_PREFIXLEN)
dp_dump_line(p, line++, " <prefixlen>%u</prefixlen>\n",
addr->a_prefixlen);
link_cache = nl_cache_mngt_require("route/link");
if (link_cache)
dp_dump_line(p, line++, " <device>%s</device>\n",
rtnl_link_i2name(link_cache, addr->a_ifindex,
buf, sizeof(buf)));
else
dp_dump_line(p, line++, " <device>%u</device>\n",
addr->a_ifindex);
if (addr->ce_mask & ADDR_ATTR_SCOPE)
dp_dump_line(p, line++, " <scope>%s</scope>\n",
rtnl_scope2str(addr->a_scope, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_LABEL)
dp_dump_line(p, line++, " <label>%s</label>\n", addr->a_label);
rtnl_addr_flags2str(addr->a_flags, buf, sizeof(buf));
if (buf[0])
dp_dump_line(p, line++, " <flags>%s</flags>\n", buf);
if (addr->ce_mask & ADDR_ATTR_CACHEINFO) {
struct rtnl_addr_cacheinfo *ci = &addr->a_cacheinfo;
dp_dump_line(p, line++, " <cacheinfo>\n");
dp_dump_line(p, line++, " <valid>%s</valid>\n",
ci->aci_valid == 0xFFFFFFFFU ? "forever" :
nl_msec2str(ci->aci_valid * 1000,
buf, sizeof(buf)));
dp_dump_line(p, line++, " <prefered>%s</prefered>\n",
ci->aci_prefered == 0xFFFFFFFFU ? "forever" :
nl_msec2str(ci->aci_prefered * 1000,
buf, sizeof(buf)));
dp_dump_line(p, line++, " <created>%s</created>\n",
nl_msec2str(addr->a_cacheinfo.aci_cstamp * 10,
buf, sizeof(buf)));
dp_dump_line(p, line++, " <last-update>%s</last-update>\n",
nl_msec2str(addr->a_cacheinfo.aci_tstamp * 10,
buf, sizeof(buf)));
dp_dump_line(p, line++, " </cacheinfo>\n");
}
dp_dump_line(p, line++, "</address>\n");
return line;
}
static int addr_dump_env(struct nl_object *obj, struct nl_dump_params *p)
{
struct rtnl_addr *addr = (struct rtnl_addr *) obj;
struct nl_cache *link_cache;
char buf[128];
int line = 0;
dp_dump_line(p, line++, "ADDR_FAMILY=%s\n",
nl_af2str(addr->a_family, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_LOCAL)
dp_dump_line(p, line++, "ADDR_LOCAL=%s\n",
nl_addr2str(addr->a_local, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_PEER)
dp_dump_line(p, line++, "ADDR_PEER=%s\n",
nl_addr2str(addr->a_peer, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_BROADCAST)
dp_dump_line(p, line++, "ADDR_BROADCAST=%s\n",
nl_addr2str(addr->a_bcast, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_ANYCAST)
dp_dump_line(p, line++, "ADDR_ANYCAST=%s\n",
nl_addr2str(addr->a_anycast, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_MULTICAST)
dp_dump_line(p, line++, "ADDR_MULTICAST=%s\n",
nl_addr2str(addr->a_multicast, buf,
sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_PREFIXLEN)
dp_dump_line(p, line++, "ADDR_PREFIXLEN=%u\n",
addr->a_prefixlen);
link_cache = nl_cache_mngt_require("route/link");
dp_dump_line(p, line++, "ADDR_IFINDEX=%u\n", addr->a_ifindex);
if (link_cache)
dp_dump_line(p, line++, "ADDR_IFNAME=%s\n",
rtnl_link_i2name(link_cache, addr->a_ifindex,
buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_SCOPE)
dp_dump_line(p, line++, "ADDR_SCOPE=%s\n",
rtnl_scope2str(addr->a_scope, buf, sizeof(buf)));
if (addr->ce_mask & ADDR_ATTR_LABEL)
dp_dump_line(p, line++, "ADDR_LABEL=%s\n", addr->a_label);
rtnl_addr_flags2str(addr->a_flags, buf, sizeof(buf));
if (buf[0])
dp_dump_line(p, line++, "ADDR_FLAGS=%s\n", buf);
if (addr->ce_mask & ADDR_ATTR_CACHEINFO) {
struct rtnl_addr_cacheinfo *ci = &addr->a_cacheinfo;
dp_dump_line(p, line++, "ADDR_CACHEINFO_VALID=%s\n",
ci->aci_valid == 0xFFFFFFFFU ? "forever" :
nl_msec2str(ci->aci_valid * 1000,
buf, sizeof(buf)));
dp_dump_line(p, line++, "ADDR_CACHEINFO_PREFERED=%s\n",
ci->aci_prefered == 0xFFFFFFFFU ? "forever" :
nl_msec2str(ci->aci_prefered * 1000,
buf, sizeof(buf)));
dp_dump_line(p, line++, "ADDR_CACHEINFO_CREATED=%s\n",
nl_msec2str(addr->a_cacheinfo.aci_cstamp * 10,
buf, sizeof(buf)));
dp_dump_line(p, line++, "ADDR_CACHEINFO_LASTUPDATE=%s\n",
nl_msec2str(addr->a_cacheinfo.aci_tstamp * 10,
buf, sizeof(buf)));
}
return line;
}
static int addr_compare(struct nl_object *_a, struct nl_object *_b,
uint32_t attrs, int flags)
{
struct rtnl_addr *a = (struct rtnl_addr *) _a;
struct rtnl_addr *b = (struct rtnl_addr *) _b;
int diff = 0;
#define ADDR_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, ADDR_ATTR_##ATTR, a, b, EXPR)
diff |= ADDR_DIFF(IFINDEX, a->a_ifindex != b->a_ifindex);
diff |= ADDR_DIFF(FAMILY, a->a_family != b->a_family);
diff |= ADDR_DIFF(SCOPE, a->a_scope != b->a_scope);
diff |= ADDR_DIFF(LABEL, strcmp(a->a_label, b->a_label));
diff |= ADDR_DIFF(PEER, nl_addr_cmp(a->a_peer, b->a_peer));
diff |= ADDR_DIFF(LOCAL, nl_addr_cmp(a->a_local, b->a_local));
diff |= ADDR_DIFF(ANYCAST, nl_addr_cmp(a->a_anycast,b->a_anycast));
diff |= ADDR_DIFF(MULTICAST, nl_addr_cmp(a->a_multicast,
b->a_multicast));
diff |= ADDR_DIFF(BROADCAST, nl_addr_cmp(a->a_bcast, b->a_bcast));
if (flags & LOOSE_FLAG_COMPARISON)
diff |= ADDR_DIFF(FLAGS,
(a->a_flags ^ b->a_flags) & b->a_flag_mask);
else
diff |= ADDR_DIFF(FLAGS, a->a_flags != b->a_flags);
#undef ADDR_DIFF
return diff;
}
static struct trans_tbl addr_attrs[] = {
__ADD(ADDR_ATTR_FAMILY, family)
__ADD(ADDR_ATTR_PREFIXLEN, prefixlen)
__ADD(ADDR_ATTR_FLAGS, flags)
__ADD(ADDR_ATTR_SCOPE, scope)
__ADD(ADDR_ATTR_IFINDEX, ifindex)
__ADD(ADDR_ATTR_LABEL, label)
__ADD(ADDR_ATTR_CACHEINFO, cacheinfo)
__ADD(ADDR_ATTR_PEER, peer)
__ADD(ADDR_ATTR_LOCAL, local)
__ADD(ADDR_ATTR_BROADCAST, broadcast)
__ADD(ADDR_ATTR_ANYCAST, anycast)
__ADD(ADDR_ATTR_MULTICAST, multicast)
};
static char *addr_attrs2str(int attrs, char *buf, size_t len)
{
return __flags2str(attrs, buf, len, addr_attrs,
ARRAY_SIZE(addr_attrs));
}
/**
* @name Allocation/Freeing
* @{
*/
struct rtnl_addr *rtnl_addr_alloc(void)
{
return (struct rtnl_addr *) nl_object_alloc(&addr_obj_ops);
}
void rtnl_addr_put(struct rtnl_addr *addr)
{
nl_object_put((struct nl_object *) addr);
}
/** @} */
/**
* @name Cache Management
* @{
*/
struct nl_cache *rtnl_addr_alloc_cache(struct nl_handle *handle)
{
struct nl_cache *cache;
cache = nl_cache_alloc(&rtnl_addr_ops);
if (!cache)
return NULL;
if (handle && nl_cache_refill(handle, cache) < 0) {
nl_cache_free(cache);
return NULL;
}
return cache;
}
/** @} */
static struct nl_msg *build_addr_msg(struct rtnl_addr *tmpl, int cmd, int flags)
{
struct nl_msg *msg;
struct ifaddrmsg am = {
.ifa_family = tmpl->a_family,
.ifa_index = tmpl->a_ifindex,
.ifa_prefixlen = tmpl->a_prefixlen,
};
if (tmpl->ce_mask & ADDR_ATTR_SCOPE)
am.ifa_scope = tmpl->a_scope;
else {
/* compatibility hack */
if (tmpl->a_family == AF_INET &&
tmpl->ce_mask & ADDR_ATTR_LOCAL &&
*((char *) nl_addr_get_binary_addr(tmpl->a_local)) == 127)
am.ifa_scope = RT_SCOPE_HOST;
else
am.ifa_scope = RT_SCOPE_UNIVERSE;
}
msg = nlmsg_alloc_simple(cmd, flags);
if (!msg)
goto nla_put_failure;
if (nlmsg_append(msg, &am, sizeof(am), NLMSG_ALIGNTO) < 0)
goto nla_put_failure;
if (tmpl->ce_mask & ADDR_ATTR_LOCAL)
NLA_PUT_ADDR(msg, IFA_LOCAL, tmpl->a_local);
if (tmpl->ce_mask & ADDR_ATTR_PEER)
NLA_PUT_ADDR(msg, IFA_ADDRESS, tmpl->a_peer);
else
NLA_PUT_ADDR(msg, IFA_ADDRESS, tmpl->a_local);
if (tmpl->ce_mask & ADDR_ATTR_LABEL)
NLA_PUT_STRING(msg, IFA_LABEL, tmpl->a_label);
if (tmpl->ce_mask & ADDR_ATTR_BROADCAST)
NLA_PUT_ADDR(msg, IFA_BROADCAST, tmpl->a_bcast);
if (tmpl->ce_mask & ADDR_ATTR_ANYCAST)
NLA_PUT_ADDR(msg, IFA_ANYCAST, tmpl->a_anycast);
return msg;
nla_put_failure:
nlmsg_free(msg);
return NULL;
}
/**
* @name Addition
* @{
*/
/**
* Build netlink request message to request addition of new address
* @arg addr Address object representing the new address.
* @arg flags Additional netlink message flags.
*
* Builds a new netlink message requesting the addition of a new
* address. The netlink message header isn't fully equipped with
* all relevant fields and must thus be sent out via nl_send_auto_complete()
* or supplemented as needed.
*
* Minimal required attributes:
* - interface index (rtnl_addr_set_ifindex())
* - local address (rtnl_addr_set_local())
*
* The scope will default to universe except for loopback addresses in
* which case a host scope is used if not specified otherwise.
*
* @note Free the memory after usage using nlmsg_free().
* @return Newly allocated netlink message or NULL if an error occured.
*/
struct nl_msg *rtnl_addr_build_add_request(struct rtnl_addr *addr, int flags)
{
int required = ADDR_ATTR_IFINDEX | ADDR_ATTR_FAMILY |
ADDR_ATTR_PREFIXLEN | ADDR_ATTR_LOCAL;
if ((addr->ce_mask & required) != required) {
nl_error(EINVAL, "Missing mandatory attributes, required are: "
"ifindex, family, prefixlen, local address.");
return NULL;
}
return build_addr_msg(addr, RTM_NEWADDR, NLM_F_CREATE | flags);
}
/**
* Request addition of new address
* @arg handle Netlink handle.
* @arg addr Address object representing the new address.
* @arg flags Additional netlink message flags.
*
* Builds a netlink message by calling rtnl_addr_build_add_request(),
* sends the request to the kernel and waits for the next ACK to be
* received and thus blocks until the request has been fullfilled.
*
* @see rtnl_addr_build_add_request()
*
* @return 0 on sucess or a negative error if an error occured.
*/
int rtnl_addr_add(struct nl_handle *handle, struct rtnl_addr *addr, int flags)
{
struct nl_msg *msg;
int err;
msg = rtnl_addr_build_add_request(addr, flags);
if (!msg)
return nl_get_errno();
err = nl_send_auto_complete(handle, msg);
nlmsg_free(msg);
if (err < 0)
return err;
return nl_wait_for_ack(handle);
}
/** @} */
/**
* @name Deletion
* @{
*/
/**
* Build a netlink request message to request deletion of an address
* @arg addr Address object to be deleteted.
* @arg flags Additional netlink message flags.
*
* Builds a new netlink message requesting a deletion of an address.
* The netlink message header isn't fully equipped with all relevant
* fields and must thus be sent out via nl_send_auto_complete()
* or supplemented as needed.
*
* Minimal required attributes:
* - interface index (rtnl_addr_set_ifindex())
* - address family (rtnl_addr_set_family())
*
* Optional attributes:
* - local address (rtnl_addr_set_local())
* - label (rtnl_addr_set_label(), IPv4/DECnet only)
* - peer address (rtnl_addr_set_peer(), IPv4 only)
*
* @note Free the memory after usage using nlmsg_free().
* @return Newly allocated netlink message or NULL if an error occured.
*/
struct nl_msg *rtnl_addr_build_delete_request(struct rtnl_addr *addr, int flags)
{
int required = ADDR_ATTR_IFINDEX | ADDR_ATTR_FAMILY;
if ((addr->ce_mask & required) != required) {
nl_error(EINVAL, "Missing mandatory attributes, required are: "
"ifindex, family");
return NULL;
}
return build_addr_msg(addr, RTM_DELADDR, flags);
}
/**
* Request deletion of an address
* @arg handle Netlink handle.
* @arg addr Address object to be deleted.
* @arg flags Additional netlink message flags.
*
* Builds a netlink message by calling rtnl_addr_build_delete_request(),
* sends the request to the kernel and waits for the next ACK to be
* received and thus blocks until the request has been fullfilled.
*
* @see rtnl_addr_build_delete_request();
*
* @return 0 on sucess or a negative error if an error occured.
*/
int rtnl_addr_delete(struct nl_handle *handle, struct rtnl_addr *addr,
int flags)
{
struct nl_msg *msg;
int err;
msg = rtnl_addr_build_delete_request(addr, flags);
if (!msg)
return nl_get_errno();
err = nl_send_auto_complete(handle, msg);
nlmsg_free(msg);
if (err < 0)
return err;
return nl_wait_for_ack(handle);
}
/** @} */
/**
* @name Attributes
* @{
*/
void rtnl_addr_set_label(struct rtnl_addr *addr, const char *label)
{
strncpy(addr->a_label, label, sizeof(addr->a_label) - 1);
addr->ce_mask |= ADDR_ATTR_LABEL;
}
char *rtnl_addr_get_label(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_LABEL)
return addr->a_label;
else
return NULL;
}
void rtnl_addr_set_ifindex(struct rtnl_addr *addr, int ifindex)
{
addr->a_ifindex = ifindex;
addr->ce_mask |= ADDR_ATTR_IFINDEX;
}
int rtnl_addr_get_ifindex(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_IFINDEX)
return addr->a_ifindex;
else
return RTNL_LINK_NOT_FOUND;
}
void rtnl_addr_set_family(struct rtnl_addr *addr, int family)
{
addr->a_family = family;
addr->ce_mask |= ADDR_ATTR_FAMILY;
}
int rtnl_addr_get_family(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_FAMILY)
return addr->a_family;
else
return AF_UNSPEC;
}
void rtnl_addr_set_prefixlen(struct rtnl_addr *addr, int prefix)
{
addr->a_prefixlen = prefix;
addr->ce_mask |= ADDR_ATTR_PREFIXLEN;
}
int rtnl_addr_get_prefixlen(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_PREFIXLEN)
return addr->a_prefixlen;
else
return -1;
}
void rtnl_addr_set_scope(struct rtnl_addr *addr, int scope)
{
addr->a_scope = scope;
addr->ce_mask |= ADDR_ATTR_SCOPE;
}
int rtnl_addr_get_scope(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_SCOPE)
return addr->a_scope;
else
return -1;
}
void rtnl_addr_set_flags(struct rtnl_addr *addr, unsigned int flags)
{
addr->a_flag_mask |= flags;
addr->a_flags |= flags;
addr->ce_mask |= ADDR_ATTR_FLAGS;
}
void rtnl_addr_unset_flags(struct rtnl_addr *addr, unsigned int flags)
{
addr->a_flag_mask |= flags;
addr->a_flags &= ~flags;
addr->ce_mask |= ADDR_ATTR_FLAGS;
}
unsigned int rtnl_addr_get_flags(struct rtnl_addr *addr)
{
return addr->a_flags;
}
static inline int __assign_addr(struct rtnl_addr *addr, struct nl_addr **pos,
struct nl_addr *new, int flag)
{
if (addr->ce_mask & ADDR_ATTR_FAMILY) {
if (new->a_family != addr->a_family)
return nl_error(EINVAL, "Address family mismatch");
} else
addr->a_family = new->a_family;
if (*pos)
nl_addr_put(*pos);
*pos = nl_addr_get(new);
addr->ce_mask |= (flag | ADDR_ATTR_FAMILY);
return 0;
}
int rtnl_addr_set_local(struct rtnl_addr *addr, struct nl_addr *local)
{
int err;
err = __assign_addr(addr, &addr->a_local, local, ADDR_ATTR_LOCAL);
if (err < 0)
return err;
if (!(addr->ce_mask & ADDR_ATTR_PEER)) {
addr->a_prefixlen = nl_addr_get_prefixlen(addr->a_local);
addr->ce_mask |= ADDR_ATTR_PREFIXLEN;
}
return 0;
}
struct nl_addr *rtnl_addr_get_local(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_LOCAL)
return addr->a_local;
else
return NULL;
}
int rtnl_addr_set_peer(struct rtnl_addr *addr, struct nl_addr *peer)
{
return __assign_addr(addr, &addr->a_peer, peer, ADDR_ATTR_PEER);
addr->a_prefixlen = nl_addr_get_prefixlen(addr->a_peer);
addr->ce_mask |= ADDR_ATTR_PREFIXLEN;
return 0;
}
struct nl_addr *rtnl_addr_get_peer(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_PEER)
return addr->a_peer;
else
return NULL;
}
int rtnl_addr_set_broadcast(struct rtnl_addr *addr, struct nl_addr *bcast)
{
return __assign_addr(addr, &addr->a_bcast, bcast, ADDR_ATTR_BROADCAST);
}
struct nl_addr *rtnl_addr_get_broadcast(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_BROADCAST)
return addr->a_bcast;
else
return NULL;
}
int rtnl_addr_set_anycast(struct rtnl_addr *addr, struct nl_addr *anycast)
{
return __assign_addr(addr, &addr->a_anycast, anycast,
ADDR_ATTR_ANYCAST);
}
struct nl_addr *rtnl_addr_get_anycast(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_ANYCAST)
return addr->a_anycast;
else
return NULL;
}
int rtnl_addr_set_multicast(struct rtnl_addr *addr, struct nl_addr *multicast)
{
return __assign_addr(addr, &addr->a_multicast, multicast,
ADDR_ATTR_MULTICAST);
}
struct nl_addr *rtnl_addr_get_multicast(struct rtnl_addr *addr)
{
if (addr->ce_mask & ADDR_ATTR_MULTICAST)
return addr->a_multicast;
else
return NULL;
}
/** @} */
/**
* @name Flags Translations
* @{
*/
static struct trans_tbl addr_flags[] = {
__ADD(IFA_F_SECONDARY, secondary)
__ADD(IFA_F_DEPRECATED, deprecated)
__ADD(IFA_F_TENTATIVE, tentative)
__ADD(IFA_F_PERMANENT, permanent)
};
char *rtnl_addr_flags2str(int flags, char *buf, size_t size)
{
return __flags2str(flags, buf, size, addr_flags,
ARRAY_SIZE(addr_flags));
}
int rtnl_addr_str2flags(const char *name)
{
return __str2flags(name, addr_flags, ARRAY_SIZE(addr_flags));
}
/** @} */
static struct nl_object_ops addr_obj_ops = {
.oo_name = "route/addr",
.oo_size = sizeof(struct rtnl_addr),
.oo_free_data = addr_free_data,
.oo_clone = addr_clone,
.oo_dump[NL_DUMP_BRIEF] = addr_dump_brief,
.oo_dump[NL_DUMP_FULL] = addr_dump_full,
.oo_dump[NL_DUMP_STATS] = addr_dump_stats,
.oo_dump[NL_DUMP_XML] = addr_dump_xml,
.oo_dump[NL_DUMP_ENV] = addr_dump_env,
.oo_compare = addr_compare,
.oo_attrs2str = addr_attrs2str,
.oo_id_attrs = (ADDR_ATTR_FAMILY | ADDR_ATTR_IFINDEX |
ADDR_ATTR_LOCAL | ADDR_ATTR_PREFIXLEN |
ADDR_ATTR_PEER),
};
static struct nl_af_group addr_groups[] = {
{ AF_INET, RTNLGRP_IPV4_IFADDR },
{ AF_INET6, RTNLGRP_IPV6_IFADDR },
{ END_OF_GROUP_LIST },
};
static struct nl_cache_ops rtnl_addr_ops = {
.co_name = "route/addr",
.co_hdrsize = sizeof(struct ifaddrmsg),
.co_msgtypes = {
{ RTM_NEWADDR, NL_ACT_NEW, "new" },
{ RTM_DELADDR, NL_ACT_DEL, "del" },
{ RTM_GETADDR, NL_ACT_GET, "get" },
END_OF_MSGTYPES_LIST,
},
.co_protocol = NETLINK_ROUTE,
.co_groups = addr_groups,
.co_request_update = addr_request_update,
.co_msg_parser = addr_msg_parser,
.co_obj_ops = &addr_obj_ops,
};
static void __init addr_init(void)
{
nl_cache_mngt_register(&rtnl_addr_ops);
}
static void __exit addr_exit(void)
{
nl_cache_mngt_unregister(&rtnl_addr_ops);
}
/** @} */
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