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Systemd/src/network/networkd-address.c
Umut Tezduyar Lindskog aba496a58a networkd: smooth transition from ipv4ll to dhcp address 
Currently when both ipv4ll and dhcp are enabled, ipv4ll
address (if one has been claimed) is removed when dhcp
address is aquired. This is not the best thing to do
since there might be clients unaware of the removal
trying to communicate.

This patch provides a smooth transition between ipv4ll
and dhcp. If ipv4ll address was claimed [1] before dhcp,
address is marked as deprecated. Deprecated address is still
a valid address and packets can be received on it but address
cannot be selected as a source address. If dhcp lease cannot
be extended, then ipv4ll address is marked as valid again.

[1] If there is no collision, claiming IPv4LL takes between 4 to
7 seconds.
2014-04-03 16:00:25 +02:00

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
systemd 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; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <net/if.h>
#include "networkd.h"
#include "utf8.h"
#include "util.h"
#include "conf-parser.h"
#include "network-internal.h"
static void address_init(Address *address) {
assert(address);
address->family = AF_UNSPEC;
address->scope = RT_SCOPE_UNIVERSE;
address->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
address->cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME;
}
int address_new_static(Network *network, unsigned section, Address **ret) {
_cleanup_address_free_ Address *address = NULL;
if (section) {
uint64_t key = section;
address = hashmap_get(network->addresses_by_section, &key);
if (address) {
*ret = address;
address = NULL;
return 0;
}
}
address = new0(Address, 1);
if (!address)
return -ENOMEM;
address_init(address);
address->network = network;
LIST_PREPEND(static_addresses, network->static_addresses, address);
if (section) {
address->section = section;
hashmap_put(network->addresses_by_section, &address->section, address);
}
*ret = address;
address = NULL;
return 0;
}
int address_new_dynamic(Address **ret) {
_cleanup_address_free_ Address *address = NULL;
address = new0(Address, 1);
if (!address)
return -ENOMEM;
address_init(address);
*ret = address;
address = NULL;
return 0;
}
void address_free(Address *address) {
if (!address)
return;
if (address->network) {
LIST_REMOVE(static_addresses, address->network->static_addresses, address);
if (address->section)
hashmap_remove(address->network->addresses_by_section,
&address->section);
}
free(address);
}
int address_drop(Address *address, Link *link,
sd_rtnl_message_handler_t callback) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(address);
assert(address->family == AF_INET || address->family == AF_INET6);
assert(link);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
link->ifindex, address->family);
if (r < 0) {
log_error("Could not allocate RTM_DELADDR message: %s",
strerror(-r));
return r;
}
r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
if (r < 0) {
log_error("Could not set prefixlen: %s", strerror(-r));
return r;
}
if (address->family == AF_INET)
r = sd_rtnl_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
else if (address->family == AF_INET6)
r = sd_rtnl_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
if (r < 0) {
log_error("Could not append IFA_LOCAL attribute: %s",
strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0) {
log_error("Could not send rtnetlink message: %s", strerror(-r));
return r;
}
return 0;
}
int address_update(Address *address, Link *link,
sd_rtnl_message_handler_t callback) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(address);
assert(address->family == AF_INET || address->family == AF_INET6);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
link->ifindex, address->family);
if (r < 0) {
log_error("Could not allocate RTM_NEWADDR message: %s",
strerror(-r));
return r;
}
r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
if (r < 0) {
log_error("Could not set prefixlen: %s", strerror(-r));
return r;
}
r = sd_rtnl_message_addr_set_flags(req, IFA_F_PERMANENT);
if (r < 0) {
log_error("Could not set flags: %s", strerror(-r));
return r;
}
r = sd_rtnl_message_addr_set_scope(req, address->scope);
if (r < 0) {
log_error("Could not set scope: %s", strerror(-r));
return r;
}
if (address->family == AF_INET)
r = sd_rtnl_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
else if (address->family == AF_INET6)
r = sd_rtnl_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
if (r < 0) {
log_error("Could not append IFA_LOCAL attribute: %s",
strerror(-r));
return r;
}
if (address->family == AF_INET) {
r = sd_rtnl_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
if (r < 0) {
log_error("Could not append IFA_BROADCAST attribute: %s",
strerror(-r));
return r;
}
}
if (address->label) {
r = sd_rtnl_message_append_string(req, IFA_LABEL, address->label);
if (r < 0) {
log_error("Could not append IFA_LABEL attribute: %s",
strerror(-r));
return r;
}
}
r = sd_rtnl_message_append_cache_info(req, IFA_CACHEINFO, &address->cinfo);
if (r < 0) {
log_error("Could not append IFA_CACHEINFO attribute: %s",
strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0) {
log_error("Could not send rtnetlink message: %s", strerror(-r));
return r;
}
return 0;
}
int address_configure(Address *address, Link *link,
sd_rtnl_message_handler_t callback) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(address);
assert(address->family == AF_INET || address->family == AF_INET6);
assert(link);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
link->ifindex, address->family);
if (r < 0) {
log_error("Could not allocate RTM_NEWADDR message: %s",
strerror(-r));
return r;
}
r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
if (r < 0) {
log_error("Could not set prefixlen: %s", strerror(-r));
return r;
}
r = sd_rtnl_message_addr_set_flags(req, IFA_F_PERMANENT);
if (r < 0) {
log_error("Could not set flags: %s", strerror(-r));
return r;
}
r = sd_rtnl_message_addr_set_scope(req, address->scope);
if (r < 0) {
log_error("Could not set scope: %s", strerror(-r));
return r;
}
if (address->family == AF_INET)
r = sd_rtnl_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
else if (address->family == AF_INET6)
r = sd_rtnl_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
if (r < 0) {
log_error("Could not append IFA_LOCAL attribute: %s",
strerror(-r));
return r;
}
if (address->family == AF_INET) {
r = sd_rtnl_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
if (r < 0) {
log_error("Could not append IFA_BROADCAST attribute: %s",
strerror(-r));
return r;
}
}
if (address->label) {
r = sd_rtnl_message_append_string(req, IFA_LABEL, address->label);
if (r < 0) {
log_error("Could not append IFA_LABEL attribute: %s",
strerror(-r));
return r;
}
}
r = sd_rtnl_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0) {
log_error("Could not send rtnetlink message: %s", strerror(-r));
return r;
}
return 0;
}
int config_parse_dns(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Set **dns = data;
_cleanup_address_free_ Address *n = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_new_dynamic(&n);
if (r < 0)
return r;
r = net_parse_inaddr(rvalue, &n->family, &n->in_addr);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"DNS address is invalid, ignoring assignment: %s", rvalue);
return 0;
}
set_put(*dns, n);
n = NULL;
return 0;
}
int config_parse_broadcast(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_address_free_ Address *n = NULL;
_cleanup_free_ char *address = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_new_static(network, section_line, &n);
if (r < 0)
return r;
if (n->family == AF_INET6) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Broadcast is not valid for IPv6 addresses, "
"ignoring assignment: %s", address);
return 0;
}
r = net_parse_inaddr(address, &n->family, &n->broadcast);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Broadcast is invalid, ignoring assignment: %s", address);
return 0;
}
n = NULL;
return 0;
}
int config_parse_address(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_address_free_ Address *n = NULL;
_cleanup_free_ char *address = NULL;
const char *e;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
if (streq(section, "Network")) {
/* we are not in an Address section, so treat
* this as the special '0' section */
section_line = 0;
}
r = address_new_static(network, section_line, &n);
if (r < 0)
return r;
/* Address=address/prefixlen */
/* prefixlen */
e = strchr(rvalue, '/');
if (e) {
unsigned i;
r = safe_atou(e + 1, &i);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Interface prefix length is invalid, "
"ignoring assignment: %s", e + 1);
return 0;
}
n->prefixlen = (unsigned char) i;
address = strndup(rvalue, e - rvalue);
if (!address)
return log_oom();
} else {
address = strdup(rvalue);
if (!address)
return log_oom();
}
r = net_parse_inaddr(address, &n->family, &n->in_addr);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Address is invalid, ignoring assignment: %s", address);
return 0;
}
if (n->family == AF_INET && !n->broadcast.s_addr)
n->broadcast.s_addr = n->in_addr.in.s_addr |
htonl(0xfffffffflu >> n->prefixlen);
n = NULL;
return 0;
}
int config_parse_label(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_address_free_ Address *n = NULL;
char *label;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_new_static(network, section_line, &n);
if (r < 0)
return r;
label = strdup(rvalue);
if (!label)
return log_oom();
if (!ascii_is_valid(label) || strlen(label) >= IFNAMSIZ) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Interface label is not ASCII clean or is too"
" long, ignoring assignment: %s", rvalue);
free(label);
return 0;
}
free(n->label);
if (*label)
n->label = label;
else {
free(label);
n->label = NULL;
}
n = NULL;
return 0;
}
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