mirror of
https://github.com/samba-team/samba.git
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71b40127e1
Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Martin Schwenke <mschwenke@ddn.com>
722 lines
17 KiB
C
722 lines
17 KiB
C
/*
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Unix SMB/CIFS implementation.
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multiple interface handling
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Jeremy Allison 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "lib/socket/interfaces.h"
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#include "librpc/gen_ndr/ioctl.h"
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#include "lib/util/smb_strtox.h"
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static struct iface_struct *probed_ifaces;
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static int total_probed;
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static struct interface *local_interfaces;
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/****************************************************************************
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Check if an IP is one of mine.
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**************************************************************************/
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bool ismyaddr(const struct sockaddr *ip)
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{
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struct interface *i;
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for (i=local_interfaces;i;i=i->next) {
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if (sockaddr_equal((struct sockaddr *)&i->ip,ip)) {
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return true;
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}
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}
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return false;
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}
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bool ismyip_v4(struct in_addr ip)
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{
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struct sockaddr_storage ss;
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in_addr_to_sockaddr_storage(&ss, ip);
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return ismyaddr((struct sockaddr *)&ss);
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}
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/****************************************************************************
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Try and find an interface that matches an ip. If we cannot, return NULL.
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**************************************************************************/
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static struct interface *iface_find(const struct sockaddr *ip,
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bool check_mask)
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{
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struct interface *i;
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if (is_address_any(ip)) {
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return local_interfaces;
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}
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for (i=local_interfaces;i;i=i->next) {
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if (check_mask) {
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if (same_net(ip, (struct sockaddr *)&i->ip, (struct sockaddr *)&i->netmask)) {
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return i;
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}
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} else if (sockaddr_equal((struct sockaddr *)&i->ip, ip)) {
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return i;
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}
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}
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return NULL;
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}
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/****************************************************************************
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Check if a packet is from a local (known) net.
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**************************************************************************/
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bool is_local_net(const struct sockaddr *from)
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{
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struct interface *i;
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for (i=local_interfaces;i;i=i->next) {
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if (same_net(from, (struct sockaddr *)&i->ip, (struct sockaddr *)&i->netmask)) {
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return true;
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}
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}
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return false;
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}
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#if defined(HAVE_IPV6)
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void setup_linklocal_scope_id(struct sockaddr *pss)
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{
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struct interface *i;
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for (i=local_interfaces;i;i=i->next) {
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if (sockaddr_equal((struct sockaddr *)&i->ip,pss)) {
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struct sockaddr_in6 *psa6 =
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(struct sockaddr_in6 *)pss;
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psa6->sin6_scope_id = if_nametoindex(i->name);
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return;
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}
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}
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}
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#endif
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/****************************************************************************
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Check if a packet is from a local (known) net.
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**************************************************************************/
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bool is_local_net_v4(struct in_addr from)
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{
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struct sockaddr_storage ss;
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in_addr_to_sockaddr_storage(&ss, from);
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return is_local_net((struct sockaddr *)&ss);
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}
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/****************************************************************************
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How many interfaces do we have ?
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**************************************************************************/
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int iface_count(void)
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{
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int ret = 0;
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struct interface *i;
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for (i=local_interfaces;i;i=i->next) {
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ret++;
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}
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return ret;
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}
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/****************************************************************************
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How many non-loopback IPv4 interfaces do we have ?
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**************************************************************************/
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int iface_count_v4_nl(void)
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{
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int ret = 0;
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struct interface *i;
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for (i=local_interfaces;i;i=i->next) {
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if (is_loopback_addr((struct sockaddr *)&i->ip)) {
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continue;
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}
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if (i->ip.ss_family == AF_INET) {
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ret++;
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}
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}
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return ret;
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}
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/****************************************************************************
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Return a pointer to the in_addr of the first IPv4 interface that's
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not 0.0.0.0.
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**************************************************************************/
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const struct in_addr *first_ipv4_iface(void)
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{
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struct interface *i;
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for (i=local_interfaces;i ;i=i->next) {
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if ((i->ip.ss_family == AF_INET) &&
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(!is_zero_ip_v4(((struct sockaddr_in *)&i->ip)->sin_addr)))
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{
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break;
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}
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}
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if (!i) {
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return NULL;
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}
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return &((const struct sockaddr_in *)&i->ip)->sin_addr;
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}
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/****************************************************************************
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Return the Nth interface.
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**************************************************************************/
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struct interface *get_interface(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next) {
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n--;
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}
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if (i) {
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return i;
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}
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return NULL;
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}
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/****************************************************************************
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Return IP sockaddr_storage of the Nth interface.
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**************************************************************************/
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const struct sockaddr_storage *iface_n_sockaddr_storage(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next) {
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n--;
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}
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if (i) {
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return &i->ip;
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}
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return NULL;
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}
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/****************************************************************************
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Return IPv4 of the Nth interface (if a v4 address). NULL otherwise.
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**************************************************************************/
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const struct in_addr *iface_n_ip_v4(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next) {
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n--;
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}
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if (i && i->ip.ss_family == AF_INET) {
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return &((const struct sockaddr_in *)&i->ip)->sin_addr;
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}
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return NULL;
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}
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/****************************************************************************
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Return IPv4 bcast of the Nth interface (if a v4 address). NULL otherwise.
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**************************************************************************/
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const struct in_addr *iface_n_bcast_v4(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next) {
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n--;
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}
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if (i && i->ip.ss_family == AF_INET) {
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return &((const struct sockaddr_in *)&i->bcast)->sin_addr;
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}
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return NULL;
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}
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/****************************************************************************
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Return bcast of the Nth interface.
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**************************************************************************/
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const struct sockaddr_storage *iface_n_bcast(int n)
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{
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struct interface *i;
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for (i=local_interfaces;i && n;i=i->next) {
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n--;
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}
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if (i) {
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return &i->bcast;
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}
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return NULL;
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}
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/* these 3 functions return the ip/bcast/nmask for the interface
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most appropriate for the given ip address. If they can't find
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an appropriate interface they return the requested field of the
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first known interface. */
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const struct sockaddr_storage *iface_ip(const struct sockaddr *ip)
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{
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struct interface *i = iface_find(ip, true);
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if (i) {
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return &i->ip;
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}
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/* Search for the first interface with
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* matching address family. */
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for (i=local_interfaces;i;i=i->next) {
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if (i->ip.ss_family == ip->sa_family) {
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return &i->ip;
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}
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}
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return NULL;
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}
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/*
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return True if a IP is directly reachable on one of our interfaces
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*/
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bool iface_local(const struct sockaddr *ip)
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{
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return iface_find(ip, true) ? true : false;
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}
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/****************************************************************************
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Add an interface to the linked list of interfaces.
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****************************************************************************/
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static void add_interface(const struct iface_struct *ifs)
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{
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char addr[INET6_ADDRSTRLEN];
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struct interface *iface;
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if (iface_find((const struct sockaddr *)&ifs->ip, False)) {
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DEBUG(3,("add_interface: not adding duplicate interface %s\n",
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print_sockaddr(addr, sizeof(addr), &ifs->ip) ));
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return;
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}
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if (!(ifs->flags & (IFF_BROADCAST|IFF_LOOPBACK))) {
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DEBUG(3,("not adding non-broadcast interface %s\n",
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ifs->name ));
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return;
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}
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iface = SMB_MALLOC_P(struct interface);
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if (!iface) {
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return;
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}
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ZERO_STRUCTPN(iface);
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iface->name = SMB_STRDUP(ifs->name);
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if (!iface->name) {
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SAFE_FREE(iface);
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return;
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}
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iface->flags = ifs->flags;
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iface->ip = ifs->ip;
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iface->netmask = ifs->netmask;
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iface->bcast = ifs->bcast;
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iface->linkspeed = ifs->linkspeed;
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iface->capability = ifs->capability;
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iface->if_index = ifs->if_index;
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DLIST_ADD(local_interfaces, iface);
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DEBUG(2,("added interface %s ip=%s ",
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iface->name,
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print_sockaddr(addr, sizeof(addr), &iface->ip) ));
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DEBUG(2,("bcast=%s ",
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print_sockaddr(addr, sizeof(addr),
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&iface->bcast) ));
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DEBUG(2,("netmask=%s\n",
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print_sockaddr(addr, sizeof(addr),
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&iface->netmask) ));
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}
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static void parse_extra_info(char *key, uint64_t *speed, uint32_t *cap,
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uint32_t *if_index)
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{
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while (key != NULL && *key != '\0') {
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char *next_key;
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char *val;
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int error = 0;
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next_key = strchr_m(key, ',');
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if (next_key != NULL) {
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*next_key++ = 0;
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}
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val = strchr_m(key, '=');
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if (val != NULL) {
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*val++ = 0;
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if (strequal_m(key, "speed")) {
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*speed = (uint64_t)smb_strtoull(val,
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NULL,
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0,
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&error,
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SMB_STR_STANDARD);
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if (error != 0) {
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DBG_DEBUG("Invalid speed value (%s)\n", val);
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}
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} else if (strequal_m(key, "capability")) {
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if (strequal_m(val, "RSS")) {
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*cap |= FSCTL_NET_IFACE_RSS_CAPABLE;
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} else if (strequal(val, "RDMA")) {
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*cap |= FSCTL_NET_IFACE_RDMA_CAPABLE;
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} else {
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DBG_WARNING("Capability unknown: "
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"'%s'\n", val);
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}
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} else if (strequal_m(key, "if_index")) {
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*if_index = (uint32_t)smb_strtoul(val,
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NULL,
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0,
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&error,
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SMB_STR_STANDARD);
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if (error != 0) {
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DBG_DEBUG("Invalid key value (%s)\n", val);
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}
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} else {
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DBG_DEBUG("Key unknown: '%s'\n", key);
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}
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}
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key = next_key;
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}
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}
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/****************************************************************************
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Interpret a single element from a interfaces= config line.
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This handles the following different forms:
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1) wildcard interface name
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2) DNS name
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3) IP/masklen
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4) ip/mask
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5) bcast/mask
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Additional information for an interface can be specified with
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this extended syntax:
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"interface[;key1=value1[,key2=value2[...]]]"
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Note: The double quoting is important for the
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smb.conf parser! Otherwise the ';' and ',' separates
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two interfaces.
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where
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- keys known: 'speed', 'capability', 'if_index'
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- speed is in bits per second
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- capabilities known: 'RSS', 'RDMA'
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- if_index should be used with care, because
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these indexes should not conicide with indexes
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the kernel sets...
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Note: The specified values overwrite the autodetected values!
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****************************************************************************/
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static void interpret_interface(char *token)
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{
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struct sockaddr_storage ss;
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struct sockaddr_storage ss_mask;
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struct sockaddr_storage ss_net;
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struct sockaddr_storage ss_bcast;
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struct iface_struct ifs;
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char *p;
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int i;
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bool added=false;
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bool goodaddr = false;
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uint64_t speed = 0;
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uint32_t cap = FSCTL_NET_IFACE_NONE_CAPABLE;
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uint32_t if_index = 0;
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bool speed_set = false;
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bool cap_set = false;
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bool if_index_set = false;
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/*
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* extract speed / capability information if present
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*/
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p = strchr_m(token, ';');
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if (p != NULL) {
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*p++ = 0;
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parse_extra_info(p, &speed, &cap, &if_index);
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if (speed != 0) {
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speed_set = true;
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}
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if (cap != FSCTL_NET_IFACE_NONE_CAPABLE) {
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cap_set = true;
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}
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if (if_index != 0) {
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if_index_set = true;
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}
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}
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/* first check if it is an interface name */
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for (i=0;i<total_probed;i++) {
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if (gen_fnmatch(token, probed_ifaces[i].name) == 0) {
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if (speed_set) {
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probed_ifaces[i].linkspeed = speed;
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}
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if (cap_set) {
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probed_ifaces[i].capability = cap;
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}
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if (if_index_set) {
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probed_ifaces[i].if_index = if_index;
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}
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add_interface(&probed_ifaces[i]);
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added = true;
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}
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}
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if (added) {
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return;
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}
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p = strchr_m(token,'/');
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if (p == NULL) {
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if (!interpret_string_addr(&ss, token, 0)) {
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DEBUG(2, ("interpret_interface: Can't find address "
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"for %s\n", token));
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return;
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}
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for (i=0;i<total_probed;i++) {
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if (sockaddr_equal((struct sockaddr *)&ss,
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(struct sockaddr *)&probed_ifaces[i].ip))
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{
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if (speed_set) {
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probed_ifaces[i].linkspeed = speed;
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}
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if (cap_set) {
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probed_ifaces[i].capability = cap;
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}
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if (if_index_set) {
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probed_ifaces[i].if_index = if_index;
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}
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add_interface(&probed_ifaces[i]);
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return;
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}
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}
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DEBUG(2,("interpret_interface: "
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"can't determine interface for %s\n",
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token));
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return;
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}
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/* parse it into an IP address/netmasklength pair */
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*p = 0;
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goodaddr = interpret_string_addr(&ss, token, 0);
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*p++ = '/';
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if (!goodaddr) {
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DEBUG(2,("interpret_interface: "
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"can't determine interface for %s\n",
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token));
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return;
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}
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if (strlen(p) > 2) {
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goodaddr = interpret_string_addr(&ss_mask, p, 0);
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if (!goodaddr) {
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DEBUG(2,("interpret_interface: "
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"can't determine netmask from %s\n",
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p));
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return;
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}
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} else {
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int error = 0;
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unsigned long val;
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val = smb_strtoul(p, NULL, 0, &error, SMB_STR_FULL_STR_CONV);
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if (error != 0) {
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DEBUG(2,("interpret_interface: "
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"can't determine netmask value from %s\n",
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p));
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return;
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}
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if (!make_netmask(&ss_mask, &ss, val)) {
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DEBUG(2,("interpret_interface: "
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"can't apply netmask value %lu from %s\n",
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val,
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p));
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return;
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}
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}
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make_bcast(&ss_bcast, &ss, &ss_mask);
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make_net(&ss_net, &ss, &ss_mask);
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/* Maybe the first component was a broadcast address. */
|
|
if (sockaddr_equal((struct sockaddr *)&ss_bcast, (struct sockaddr *)&ss) ||
|
|
sockaddr_equal((struct sockaddr *)&ss_net, (struct sockaddr *)&ss)) {
|
|
for (i=0;i<total_probed;i++) {
|
|
if (same_net((struct sockaddr *)&ss,
|
|
(struct sockaddr *)&probed_ifaces[i].ip,
|
|
(struct sockaddr *)&ss_mask)) {
|
|
/* Temporarily replace netmask on
|
|
* the detected interface - user knows
|
|
* best.... */
|
|
struct sockaddr_storage saved_mask =
|
|
probed_ifaces[i].netmask;
|
|
probed_ifaces[i].netmask = ss_mask;
|
|
DEBUG(2,("interpret_interface: "
|
|
"using netmask value %s from "
|
|
"config file on interface %s\n",
|
|
p,
|
|
probed_ifaces[i].name));
|
|
if (speed_set) {
|
|
probed_ifaces[i].linkspeed = speed;
|
|
}
|
|
if (cap_set) {
|
|
probed_ifaces[i].capability = cap;
|
|
}
|
|
if (if_index_set) {
|
|
probed_ifaces[i].if_index = if_index;
|
|
}
|
|
add_interface(&probed_ifaces[i]);
|
|
probed_ifaces[i].netmask = saved_mask;
|
|
return;
|
|
}
|
|
}
|
|
DEBUG(2,("interpret_interface: Can't determine ip for "
|
|
"broadcast address %s\n",
|
|
token));
|
|
return;
|
|
}
|
|
|
|
/* Just fake up the interface definition. User knows best. */
|
|
|
|
DEBUG(2,("interpret_interface: Adding interface %s\n",
|
|
token));
|
|
|
|
ZERO_STRUCT(ifs);
|
|
(void)strlcpy(ifs.name, token, sizeof(ifs.name));
|
|
ifs.flags = IFF_BROADCAST;
|
|
ifs.ip = ss;
|
|
ifs.netmask = ss_mask;
|
|
ifs.bcast = ss_bcast;
|
|
if (if_index_set) {
|
|
ifs.if_index = if_index;
|
|
}
|
|
if (speed_set) {
|
|
ifs.linkspeed = speed;
|
|
} else {
|
|
ifs.linkspeed = 1000 * 1000 * 1000;
|
|
}
|
|
ifs.capability = cap;
|
|
add_interface(&ifs);
|
|
}
|
|
|
|
/****************************************************************************
|
|
Load the list of network interfaces.
|
|
****************************************************************************/
|
|
|
|
void load_interfaces(void)
|
|
{
|
|
struct iface_struct *ifaces = NULL;
|
|
const char **ptr = lp_interfaces();
|
|
int i;
|
|
|
|
gfree_interfaces();
|
|
|
|
/* Probe the kernel for interfaces */
|
|
total_probed = get_interfaces(talloc_tos(), &ifaces);
|
|
|
|
if (total_probed > 0) {
|
|
probed_ifaces = (struct iface_struct *)smb_memdup(ifaces,
|
|
sizeof(ifaces[0])*total_probed);
|
|
if (!probed_ifaces) {
|
|
DEBUG(0,("ERROR: smb_memdup failed\n"));
|
|
exit(1);
|
|
}
|
|
}
|
|
TALLOC_FREE(ifaces);
|
|
|
|
/* if we don't have a interfaces line then use all broadcast capable
|
|
interfaces except loopback */
|
|
if (!ptr || !*ptr || !**ptr) {
|
|
if (total_probed <= 0) {
|
|
DEBUG(0,("ERROR: Could not determine network "
|
|
"interfaces, you must use a interfaces config line\n"));
|
|
exit(1);
|
|
}
|
|
for (i=0;i<total_probed;i++) {
|
|
if (probed_ifaces[i].flags & IFF_BROADCAST) {
|
|
add_interface(&probed_ifaces[i]);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (ptr) {
|
|
while (*ptr) {
|
|
char *ptr_cpy = SMB_STRDUP(*ptr);
|
|
if (ptr_cpy) {
|
|
interpret_interface(ptr_cpy);
|
|
free(ptr_cpy);
|
|
}
|
|
ptr++;
|
|
}
|
|
}
|
|
|
|
if (!local_interfaces) {
|
|
DEBUG(0,("WARNING: no network interfaces found\n"));
|
|
}
|
|
}
|
|
|
|
|
|
void gfree_interfaces(void)
|
|
{
|
|
while (local_interfaces) {
|
|
struct interface *iface = local_interfaces;
|
|
DLIST_REMOVE(local_interfaces, local_interfaces);
|
|
SAFE_FREE(iface->name);
|
|
SAFE_FREE(iface);
|
|
}
|
|
|
|
SAFE_FREE(probed_ifaces);
|
|
}
|
|
|
|
/****************************************************************************
|
|
Return True if the list of probed interfaces has changed.
|
|
****************************************************************************/
|
|
|
|
bool interfaces_changed(void)
|
|
{
|
|
bool ret = false;
|
|
int n;
|
|
struct iface_struct *ifaces = NULL;
|
|
|
|
n = get_interfaces(talloc_tos(), &ifaces);
|
|
|
|
if ((n > 0 )&& (n != total_probed ||
|
|
memcmp(ifaces, probed_ifaces, sizeof(ifaces[0])*n))) {
|
|
ret = true;
|
|
}
|
|
|
|
TALLOC_FREE(ifaces);
|
|
return ret;
|
|
}
|