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interface-ip.c
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interface-ip.c
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/*
* netifd - network interface daemon
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2012 Steven Barth <steven@midlink.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program 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 General Public License for more details.
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <libgen.h>
#include <sys/stat.h>
#include <limits.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "netifd.h"
#include "device.h"
#include "interface.h"
#include "interface-ip.h"
#include "proto.h"
#include "ubus.h"
#include "system.h"
enum {
ROUTE_INTERFACE,
ROUTE_TARGET,
ROUTE_MASK,
ROUTE_GATEWAY,
ROUTE_METRIC,
ROUTE_MTU,
ROUTE_VALID,
ROUTE_TABLE,
ROUTE_SOURCE,
ROUTE_ONLINK,
ROUTE_TYPE,
ROUTE_PROTO,
ROUTE_DISABLED,
ROUTE_ADVMSS,
__ROUTE_MAX
};
static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
[ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
[ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
[ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
[ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
[ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
[ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
[ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
[ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
[ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
[ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
[ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
[ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
[ROUTE_DISABLED] = { .name = "disabled", .type = BLOBMSG_TYPE_BOOL },
[ROUTE_ADVMSS] = { .name ="advmss", .type = BLOBMSG_TYPE_INT32 },
};
const struct uci_blob_param_list route_attr_list = {
.n_params = __ROUTE_MAX,
.params = route_attr,
};
enum {
NEIGHBOR_INTERFACE,
NEIGHBOR_ADDRESS,
NEIGHBOR_MAC,
NEIGHBOR_PROXY,
NEIGHBOR_ROUTER,
__NEIGHBOR_MAX
};
static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
[NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
[NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
[NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
[NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
[NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
};
const struct uci_blob_param_list neighbor_attr_list = {
.n_params = __NEIGHBOR_MAX,
.params = neighbor_attr,
};
struct list_head prefixes = LIST_HEAD_INIT(prefixes);
static struct device_prefix *ula_prefix = NULL;
static struct uloop_timeout valid_until_timeout;
static void
clear_if_addr(union if_addr *a, int mask)
{
int m_bytes = (mask + 7) / 8;
uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
uint8_t *p = (uint8_t *) a;
if (m_bytes < sizeof(*a))
memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
p[m_bytes - 1] &= ~m_clear;
}
static bool
match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
{
union if_addr *p1, *p2;
p1 = alloca(sizeof(*a1));
p2 = alloca(sizeof(*a2));
memcpy(p1, a1, sizeof(*a1));
clear_if_addr(p1, mask);
memcpy(p2, a2, sizeof(*a2));
clear_if_addr(p2, mask);
return !memcmp(p1, p2, sizeof(*p1));
}
static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
const union if_addr *addr, uint8_t mask, unsigned int table,
struct interface *in_iface, const char *action, bool src)
{
struct iprule rule = {
.flags = IPRULE_PRIORITY,
.priority = priority
};
if (addr) {
if (src) {
rule.flags |= IPRULE_SRC;
rule.src_addr = *addr;
rule.src_mask = mask;
} else {
rule.flags |= IPRULE_DEST;
rule.dest_addr = *addr;
rule.dest_mask = mask;
}
}
if (table) {
rule.flags |= IPRULE_LOOKUP;
rule.lookup = table;
if (!rule.lookup)
return 0;
} else if (action) {
rule.flags |= IPRULE_ACTION;
system_resolve_iprule_action(action, &rule.action);
}
if (in_iface && in_iface->l3_dev.dev) {
rule.flags |= IPRULE_IN;
strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
}
rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
}
static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
{
struct iprule rule = {
.flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
.priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
.lookup = (v6) ? iface->ip6table : iface->ip4table,
.in_dev = "lo"
};
if (!rule.lookup)
return 0;
rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
}
static bool
__find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
{
struct device_addr *addr;
vlist_for_each_element(&ip->addr, addr, node) {
if (!addr->enabled)
continue;
if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
continue;
if (((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
addr->point_to_point && a->in.s_addr == addr->point_to_point)
return true;
/* Handle offlink addresses correctly */
unsigned int mask = addr->mask;
if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
(addr->flags & DEVADDR_OFFLINK))
mask = 128;
if (!match_if_addr(&addr->addr, a, mask))
continue;
return true;
}
return false;
}
static void
__find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
bool v6, struct device_route **res)
{
struct device_route *route;
vlist_for_each_element(&ip->route, route, node) {
if (!route->enabled)
continue;
if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
continue;
if (!match_if_addr(&route->addr, a, route->mask))
continue;
if (route->flags & DEVROUTE_TABLE)
continue;
if (!*res || route->mask > (*res)->mask ||
((route->mask == (*res)->mask) && (route->flags & DEVROUTE_METRIC)
&& (route->metric < (*res)->metric)))
*res = route;
}
}
static bool
interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
{
return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
__find_ip_addr_target(&iface->config_ip, a, v6);
}
static void
interface_ip_find_route_target(struct interface *iface, union if_addr *a,
bool v6, struct device_route **route)
{
__find_ip_route_target(&iface->proto_ip, a, v6, route);
__find_ip_route_target(&iface->config_ip, a, v6, route);
}
struct interface *
interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface,
bool exclude)
{
struct device_route *route, *r_next = NULL;
bool defaultroute_target = false;
union if_addr addr_zero;
int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
struct interface *exclude_iface = NULL;
if (exclude) {
exclude_iface = iface;
iface = NULL;
}
memset(&addr_zero, 0, sizeof(addr_zero));
if (memcmp(&addr_zero, addr, addrsize) == 0)
defaultroute_target = true;
if (iface) {
/* look for locally addressable target first */
if (interface_ip_find_addr_target(iface, addr, v6))
return iface;
/* do not stop at the first route, let the lookup compare
* masks to find the best match */
interface_ip_find_route_target(iface, addr, v6, &r_next);
} else {
vlist_for_each_element(&interfaces, iface, node) {
if (iface == exclude_iface)
continue;
/* look for locally addressable target first */
if (interface_ip_find_addr_target(iface, addr, v6))
return iface;
/* do not stop at the first route, let the lookup compare
* masks to find the best match */
interface_ip_find_route_target(iface, addr, v6, &r_next);
}
}
if (!r_next)
return NULL;
iface = r_next->iface;
if (defaultroute_target)
return iface;
route = calloc(1, sizeof(*route));
if (!route)
return NULL;
route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
route->mask = v6 ? 128 : 32;
memcpy(&route->addr, addr, addrsize);
memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
route->mtu = r_next->mtu;
route->metric = r_next->metric;
route->table = r_next->table;
route->iface = iface;
vlist_add(&iface->host_routes, &route->node, route);
return iface;
}
static void
interface_set_route_info(struct interface *iface, struct device_route *route)
{
bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
if (!iface)
return;
if (!(route->flags & DEVROUTE_METRIC))
route->metric = iface->metric;
if (!(route->flags & DEVROUTE_TABLE)) {
route->table = (v6) ? iface->ip6table : iface->ip4table;
if (route->table)
route->flags |= DEVROUTE_SRCTABLE;
}
}
void
interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
{
struct interface_ip_settings *ip;
struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
struct device_neighbor *neighbor;
int af = v6 ? AF_INET6: AF_INET;
struct ether_addr *ea;
blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
if (!iface) {
if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
return;
iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
if (!iface)
return;
ip = &iface->config_ip;
} else
ip = &iface->proto_ip;
neighbor = calloc(1,sizeof(*neighbor));
if (!neighbor)
return;
neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
goto error;
} else
goto error;
if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
neighbor->flags |= DEVNEIGH_MAC;
ea = ether_aton(blobmsg_data(cur));
if (!ea)
goto error;
memcpy(neighbor->macaddr, ea, 6);
}
if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
neighbor->proxy = blobmsg_get_bool(cur);
if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
neighbor->router = blobmsg_get_bool(cur);
vlist_add(&ip->neighbor, &neighbor->node, neighbor);
return;
error:
free(neighbor);
}
void
interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
{
struct interface_ip_settings *ip;
struct blob_attr *tb[__ROUTE_MAX], *cur;
struct device_route *route;
int af = v6 ? AF_INET6 : AF_INET;
blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
if ((cur = tb[ROUTE_DISABLED]) != NULL && blobmsg_get_bool(cur))
return;
if (!iface) {
if ((cur = tb[ROUTE_INTERFACE]) == NULL)
return;
iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
if (!iface)
return;
ip = &iface->config_ip;
} else {
ip = &iface->proto_ip;
}
route = calloc(1, sizeof(*route));
if (!route)
return;
route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
route->mask = v6 ? 128 : 32;
if ((cur = tb[ROUTE_MASK]) != NULL) {
route->mask = parse_netmask_string(blobmsg_data(cur), v6);
if (route->mask > (v6 ? 128 : 32))
goto error;
}
if ((cur = tb[ROUTE_TARGET]) != NULL) {
if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
goto error;
}
}
if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
goto error;
}
}
if ((cur = tb[ROUTE_METRIC]) != NULL) {
route->metric = blobmsg_get_u32(cur);
route->flags |= DEVROUTE_METRIC;
}
if ((cur = tb[ROUTE_MTU]) != NULL) {
route->mtu = blobmsg_get_u32(cur);
route->flags |= DEVROUTE_MTU;
}
if ((cur = tb[ROUTE_ADVMSS]) != NULL) {
route->advmss = blobmsg_get_u32(cur);
route->flags |= DEVROUTE_ADVMSS;
}
/* Use source-based routing */
if ((cur = tb[ROUTE_SOURCE]) != NULL) {
char *saveptr, *source = alloca(blobmsg_data_len(cur));
memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
const char *addr = strtok_r(source, "/", &saveptr);
const char *mask = strtok_r(NULL, "/", &saveptr);
if (!addr || inet_pton(af, addr, &route->source) < 1) {
DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
goto error;
}
route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
}
if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
route->flags |= DEVROUTE_ONLINK;
if ((cur = tb[ROUTE_TABLE]) != NULL) {
if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
goto error;
}
/* only set the table flag if not using the main (default) table */
if (system_is_default_rt_table(route->table))
route->table = 0;
if (route->table)
route->flags |= DEVROUTE_TABLE;
}
if ((cur = tb[ROUTE_VALID]) != NULL) {
int64_t valid = blobmsg_get_u32(cur);
int64_t valid_until = valid + (int64_t)system_get_rtime();
if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
route->valid_until = valid_until;
}
if ((cur = tb[ROUTE_TYPE]) != NULL) {
if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
goto error;
}
route->flags |= DEVROUTE_TYPE;
}
if ((cur = tb[ROUTE_PROTO]) != NULL) {
if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
goto error;
}
route->flags |= DEVROUTE_PROTO;
}
interface_set_route_info(iface, route);
vlist_add(&ip->route, &route->node, route);
return;
error:
free(route);
}
static int
addr_cmp(const void *k1, const void *k2, void *ptr)
{
const struct device_addr *a1 = k1;
const struct device_addr *a2 = k2;
const int cmp_offset = offsetof(struct device_addr, flags);
const int cmp_size = sizeof(struct device_addr) - cmp_offset;
if (a1->index != a2->index)
return a1->index - a2->index;
return memcmp(k1+cmp_offset, k2+cmp_offset, cmp_size);
}
static int
neighbor_cmp(const void *k1, const void *k2, void *ptr)
{
const struct device_neighbor *n1 = k1, *n2 = k2;
return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
}
static int
route_cmp(const void *k1, const void *k2, void *ptr)
{
const struct device_route *r1 = k1, *r2 = k2;
if (r1->mask != r2->mask)
return r2->mask - r1->mask;
if (r1->metric != r2->metric)
return r1->metric - r2->metric;
if (r1->flags != r2->flags)
return r2->flags - r1->flags;
if (r1->sourcemask != r2->sourcemask)
return r1->sourcemask - r2->sourcemask;
if (r1->table != r2->table)
return r1->table - r2->table;
int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
if (maskcmp)
return maskcmp;
return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
}
static int
prefix_cmp(const void *k1, const void *k2, void *ptr)
{
return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
offsetof(struct device_prefix, addr));
}
static void
interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
{
struct device *dev = iface->l3_dev.dev;
struct device_route *r = &addr->subnet;
if (addr->flags & DEVADDR_OFFLINK)
return;
if (!add) {
if (!addr->subnet.iface)
return;
system_del_route(dev, r);
memset(r, 0, sizeof(*r));
return;
}
r->iface = iface;
r->flags = addr->flags;
r->mask = addr->mask;
memcpy(&r->addr, &addr->addr, sizeof(r->addr));
clear_if_addr(&r->addr, r->mask);
if (!system_resolve_rt_proto("kernel", &r->proto))
return;
r->flags |= DEVROUTE_PROTO;
system_del_route(dev, r);
r->flags &= ~DEVROUTE_PROTO;
interface_set_route_info(iface, r);
system_add_route(dev, r);
}
static void
interface_add_addr_rules(struct device_addr *addr, bool enabled)
{
bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
(v6) ? 128 : 32, addr->policy_table, NULL, NULL,
true);
set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
&addr->addr, addr->mask, addr->policy_table, NULL,
NULL, false);
}
static void
interface_update_proto_addr(struct vlist_tree *tree,
struct vlist_node *node_new,
struct vlist_node *node_old)
{
struct interface_ip_settings *ip;
struct interface *iface;
struct device *dev;
struct device_addr *a_new = NULL, *a_old = NULL;
bool replace = false;
bool keep = false;
bool v6 = false;
ip = container_of(tree, struct interface_ip_settings, addr);
iface = ip->iface;
dev = iface->l3_dev.dev;
if (!node_new || !node_old)
iface->updated |= IUF_ADDRESS;
if (node_new) {
a_new = container_of(node_new, struct device_addr, node);
if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
!a_new->broadcast) {
/* /31 and /32 addressing need 255.255.255.255
* as broadcast address. */
if (a_new->mask >= 31) {
a_new->broadcast = (uint32_t) ~0;
} else {
uint32_t mask = ~0;
uint32_t *a = (uint32_t *) &a_new->addr;
mask >>= a_new->mask;
a_new->broadcast = *a | htonl(mask);
}
}
}
if (node_old)
a_old = container_of(node_old, struct device_addr, node);
if (a_new && a_old) {
keep = true;
if (a_old->flags != a_new->flags || a_old->failed)
keep = false;
if (a_old->valid_until != a_new->valid_until ||
a_old->preferred_until != a_new->preferred_until)
replace = true;
if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
(a_new->broadcast != a_old->broadcast ||
a_new->point_to_point != a_old->point_to_point))
keep = false;
}
if (node_old) {
if (a_old->enabled && !keep) {
/*
* This is needed for source routing to work correctly. If a device
* has two connections to a network using the same subnet, adding
* only the network-rule will cause packets to be routed through the
* first matching network (source IP matches both masks)
*/
if (a_old->policy_table)
interface_add_addr_rules(a_old, false);
if (!(a_old->flags & DEVADDR_EXTERNAL)) {
interface_handle_subnet_route(iface, a_old, false);
system_del_address(dev, a_old);
if ((a_old->flags & DEVADDR_OFFLINK) && (a_old->mask < (v6 ? 128 : 32))) {
struct device_route route;
memset(&route, 0, sizeof(route));
route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
route.metric = INT32_MAX;
route.mask = a_old->mask;
route.addr = a_old->addr;
clear_if_addr(&route.addr, route.mask);
/* Delete null-route */
system_del_route(NULL, &route);
}
}
}
free(a_old->pclass);
free(a_old);
}
if (node_new) {
a_new->enabled = true;
if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
v6 = true;
a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
if (!keep || replace) {
if (!(a_new->flags & DEVADDR_EXTERNAL)) {
if (system_add_address(dev, a_new))
a_new->failed = true;
if (iface->metric || a_new->policy_table)
interface_handle_subnet_route(iface, a_new, true);
}
if (!keep) {
if (!(a_new->flags & DEVADDR_EXTERNAL) &&
(a_new->flags & DEVADDR_OFFLINK) &&
(a_new->mask < (v6 ? 128 : 32))) {
struct device_route route;
memset(&route, 0, sizeof(route));
route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
route.metric = INT32_MAX;
route.mask = a_new->mask;
route.addr = a_new->addr;
clear_if_addr(&route.addr, route.mask);
/*
* In case off link is specifed as address property
* add null-route to avoid routing loops
*/
system_add_route(NULL, &route);
}
if (a_new->policy_table)
interface_add_addr_rules(a_new, true);
}
}
}
}
static bool
enable_route(struct interface_ip_settings *ip, struct device_route *route)
{
if (ip->no_defaultroute && !route->mask)
return false;
return ip->enabled;
}
static void
interface_update_proto_neighbor(struct vlist_tree *tree,
struct vlist_node * node_new,
struct vlist_node *node_old)
{
struct device *dev;
struct device_neighbor *neighbor_old, *neighbor_new;
struct interface_ip_settings *ip;
bool keep = false;
ip = container_of(tree, struct interface_ip_settings, neighbor);
dev = ip->iface->l3_dev.dev;
neighbor_old = container_of(node_old, struct device_neighbor, node);
neighbor_new = container_of(node_new, struct device_neighbor, node);
if (node_old && node_new) {
keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
(neighbor_old->proxy == neighbor_new->proxy) &&
(neighbor_old->router == neighbor_new->router));
}
if (node_old) {
if (!keep && neighbor_old->enabled)
system_del_neighbor(dev, neighbor_old);
free(neighbor_old);
}
if (node_new) {
if (!keep && ip->enabled)
if (system_add_neighbor(dev, neighbor_new))
neighbor_new->failed = true;
neighbor_new->enabled = ip->enabled;
}
}
static void
__interface_update_route(struct interface_ip_settings *ip,
struct vlist_node *node_new,
struct vlist_node *node_old)
{
struct interface *iface = ip->iface;
struct device *dev;
struct device_route *route_old, *route_new;
bool keep = false;
dev = iface->l3_dev.dev;
if (!node_new || !node_old)
iface->updated |= IUF_ROUTE;
route_old = container_of(node_old, struct device_route, node);
route_new = container_of(node_new, struct device_route, node);
if (node_old && node_new)
keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
(route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
(route_old->proto == route_new->proto) && !route_old->failed;
if (node_old) {
if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
system_del_route(dev, route_old);
free(route_old);
}
if (node_new) {
bool _enabled = enable_route(ip, route_new);
if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
if (system_add_route(dev, route_new))
route_new->failed = true;
route_new->iface = iface;
route_new->enabled = _enabled;
}
}
static void
interface_update_proto_route(struct vlist_tree *tree,
struct vlist_node *node_new,
struct vlist_node *node_old)
{
struct interface_ip_settings *ip;
ip = container_of(tree, struct interface_ip_settings, route);
__interface_update_route(ip, node_new, node_old);
}
static void
interface_update_host_route(struct vlist_tree *tree,
struct vlist_node *node_new,
struct vlist_node *node_old)
{
struct interface *iface;
iface = container_of(tree, struct interface, host_routes);
__interface_update_route(&iface->proto_ip, node_new, node_old);
}
static void
random_ifaceid(struct in6_addr *addr)
{
static bool initialized = false;
struct timeval t;
if (!initialized) {
long int seed = 0;
gettimeofday(&t, NULL);
seed = t.tv_sec ^ t.tv_usec ^ getpid();
srand48(seed);
initialized = true;
}
addr->s6_addr32[2] = (uint32_t)mrand48();
addr->s6_addr32[3] = (uint32_t)mrand48();
}
static bool
eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
{
struct device_settings st;
device_merge_settings(iface->l3_dev.dev, &st);
if (!(st.flags & DEV_OPT_MACADDR))
return false;
/* get mac address */
uint8_t *ifaceid = addr->s6_addr + 8;
memcpy(ifaceid, st.macaddr, 3);
memcpy(ifaceid + 5, st.macaddr + 3, 3);
ifaceid[3] = 0xff;
ifaceid[4] = 0xfe;
ifaceid[0] ^= 0x02;
return true;
}
static bool
generate_ifaceid(struct interface *iface, struct in6_addr *addr)
{
bool ret = true;
/* generate new iface id */
switch (iface->assignment_iface_id_selection) {
case IFID_FIXED:
/* fixed */
/* copy host part from assignment_fixed_iface_id */
memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
break;
case IFID_RANDOM:
/* randomize last 64 bits */
random_ifaceid(addr);
break;
case IFID_EUI64:
/* eui64 */
ret = eui64_ifaceid(iface, addr);
break;
default:
ret = false;
break;
}
return ret;
}
static void
interface_set_prefix_address(struct device_prefix_assignment *assignment,
const struct device_prefix *prefix, struct interface *iface, bool add)
{
const struct interface *uplink = prefix->iface;
if (!iface->l3_dev.dev)
return;
struct device *l3_downlink = iface->l3_dev.dev;
struct device_addr addr;
struct device_route route;
memset(&addr, 0, sizeof(addr));
memset(&route, 0, sizeof(route));
addr.addr.in6 = assignment->addr;
addr.mask = assignment->length;
addr.flags = DEVADDR_INET6;
addr.preferred_until = prefix->preferred_until;
addr.valid_until = prefix->valid_until;
route.flags = DEVADDR_INET6;
route.mask = addr.mask < 64 ? 64 : addr.mask;
route.addr = addr.addr;
if (!add && assignment->enabled) {
time_t now = system_get_rtime();
if (addr.valid_until && addr.valid_until - 1 <= now) {
addr.valid_until = 0;
addr.preferred_until = 0;
} else {
/* Address is still valid; pass its ownership to kernel (see L-14 RFC 7084). */
addr.preferred_until = now;
if (!addr.valid_until || addr.valid_until > now + 7200)
addr.valid_until = now + 7200;
}
if (iface->ip6table)
set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
if (prefix->iface) {
if (prefix->iface->ip6table)
set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
addr.mask, prefix->iface->ip6table, iface, NULL, true);