Ejemplo n.º 1
0
static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
        _cleanup_address_free_ Address *ll_addr = NULL;
        _cleanup_route_free_ Route *route = NULL;
        struct in_addr address;
        int r;

        assert(ll);
        assert(link);

        r = sd_ipv4ll_get_address(ll, &address);
        if (r == -ENOENT)
                return 0;
        else if (r < 0)
                return r;

        log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u",
                       ADDRESS_FMT_VAL(address));

        r = address_new_dynamic(&ll_addr);
        if (r < 0)
                return r;

        ll_addr->family = AF_INET;
        ll_addr->in_addr.in = address;
        ll_addr->prefixlen = 16;
        ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen);
        ll_addr->scope = RT_SCOPE_LINK;

        r = address_configure(ll_addr, link, ipv4ll_address_handler);
        if (r < 0)
                return r;

        link->ipv4ll_address = false;

        r = route_new_dynamic(&route, RTPROT_STATIC);
        if (r < 0)
                return r;

        route->family = AF_INET;
        route->scope = RT_SCOPE_LINK;
        route->metrics = IPV4LL_ROUTE_METRIC;

        r = route_configure(route, link, ipv4ll_route_handler);
        if (r < 0)
                return r;

        link->ipv4ll_route = false;

        return 0;
}
Ejemplo n.º 2
0
static int ipv4ll_address_lost(Link *link) {
        _cleanup_address_free_ Address *address = NULL;
        _cleanup_route_free_ Route *route = NULL;
        struct in_addr addr;
        int r;

        assert(link);

        link->ipv4ll_route = false;
        link->ipv4ll_address =  false;

        r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
        if (r < 0)
                return 0;

        log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));

        r = address_new_dynamic(&address);
        if (r < 0) {
                log_link_error(link, "Could not allocate address: %s", strerror(-r));
                return r;
        }

        address->family = AF_INET;
        address->in_addr.in = addr;
        address->prefixlen = 16;
        address->scope = RT_SCOPE_LINK;

        address_drop(address, link, &link_address_drop_handler);

        r = route_new_dynamic(&route, RTPROT_UNSPEC);
        if (r < 0) {
                log_link_error(link, "Could not allocate route: %s",
                               strerror(-r));
                return r;
        }

        route->family = AF_INET;
        route->scope = RT_SCOPE_LINK;
        route->metrics = IPV4LL_ROUTE_METRIC;

        route_drop(route, link, &link_route_drop_handler);

        link_client_handler(link);

        return 0;
}
Ejemplo n.º 3
0
static int link_set_dhcp_routes(Link *link) {
        struct in_addr gateway;
        struct sd_dhcp_route *static_routes;
        int r, n, i;

        assert(link);
        assert(link->dhcp_lease);

        r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
        if (r < 0 && r != -ENOENT) {
                log_link_warning(link,
                                 "DHCP error: could not get gateway: %s",
                                 strerror(-r));
                return r;
        }
        if (r >= 0) {
                struct in_addr address;
                _cleanup_route_free_ Route *route = NULL;
                _cleanup_route_free_ Route *route_gw = NULL;

                r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
                if (r < 0) {
                        log_link_warning(link,
                                         "DHCP error: could not get address: %s",
                                         strerror(-r));
                        return r;
                }

                r = route_new_dynamic(&route, RTPROT_DHCP);
                if (r < 0) {
                        log_link_error(link,
                                       "Could not allocate route: %s",
                                       strerror(-r));
                        return r;
                }

                r = route_new_dynamic(&route_gw, RTPROT_DHCP);
                if (r < 0) {
                log_link_error(link,
                               "Could not allocate route: %s",
                               strerror(-r));
                               return r;
                }

                /* The dhcp netmask may mask out the gateway. Add an explicit
                 * route for the gw host so that we can route no matter the
                 * netmask or existing kernel route tables. */
                route_gw->family = AF_INET;
                route_gw->dst_addr.in = gateway;
                route_gw->dst_prefixlen = 32;
                route_gw->prefsrc_addr.in = address;
                route_gw->scope = RT_SCOPE_LINK;
                route_gw->metrics = link->network->dhcp_route_metric;

                r = route_configure(route_gw, link, &dhcp4_route_handler);
                if (r < 0) {
                        log_link_warning(link,
                                         "could not set host route: %s",
                                         strerror(-r));
                        return r;
                }

                link->dhcp4_messages ++;

                route->family = AF_INET;
                route->in_addr.in = gateway;
                route->prefsrc_addr.in = address;
                route->metrics = link->network->dhcp_route_metric;

                r = route_configure(route, link, &dhcp4_route_handler);
                if (r < 0) {
                        log_link_warning(link,
                                         "could not set routes: %s",
                                         strerror(-r));
                        link_enter_failed(link);
                        return r;
                }

                link->dhcp4_messages ++;
        }

        n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
        if (n == -ENOENT)
                return 0;
        if (n < 0) {
                log_link_warning(link,
                                 "DHCP error: could not get routes: %s",
                                 strerror(-n));

                return n;
        }

        for (i = 0; i < n; i++) {
                _cleanup_route_free_ Route *route = NULL;

                r = route_new_dynamic(&route, RTPROT_DHCP);
                if (r < 0) {
                        log_link_error(link, "Could not allocate route: %s",
                                       strerror(-r));
                        return r;
                }

                route->family = AF_INET;
                route->in_addr.in = static_routes[i].gw_addr;
                route->dst_addr.in = static_routes[i].dst_addr;
                route->dst_prefixlen = static_routes[i].dst_prefixlen;
                route->metrics = link->network->dhcp_route_metric;

                r = route_configure(route, link, &dhcp4_route_handler);
                if (r < 0) {
                        log_link_warning(link,
                                         "could not set host route: %s",
                                         strerror(-r));
                        return r;
                }

                link->dhcp4_messages ++;
        }

        return 0;
}
Ejemplo n.º 4
0
static int dhcp_lease_lost(Link *link) {
        _cleanup_address_free_ Address *address = NULL;
        struct in_addr addr;
        struct in_addr netmask;
        struct in_addr gateway;
        unsigned prefixlen = 0;
        int r;

        assert(link);
        assert(link->dhcp_lease);

        log_link_warning(link, "DHCP lease lost");

        if (link->network->dhcp_routes) {
                struct sd_dhcp_route *routes;
                int n, i;

                n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
                if (n >= 0) {
                        for (i = 0; i < n; i++) {
                                _cleanup_route_free_ Route *route = NULL;

                                r = route_new_dynamic(&route, RTPROT_UNSPEC);
                                if (r >= 0) {
                                        route->family = AF_INET;
                                        route->in_addr.in = routes[i].gw_addr;
                                        route->dst_addr.in = routes[i].dst_addr;
                                        route->dst_prefixlen = routes[i].dst_prefixlen;

                                        route_drop(route, link,
                                                   &link_route_drop_handler);
                                }
                        }
                }
        }

        r = address_new_dynamic(&address);
        if (r >= 0) {
                r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
                if (r >= 0) {
                        _cleanup_route_free_ Route *route_gw = NULL;
                        _cleanup_route_free_ Route *route = NULL;

                        r = route_new_dynamic(&route_gw, RTPROT_UNSPEC);
                        if (r >= 0) {
                                route_gw->family = AF_INET;
                                route_gw->dst_addr.in = gateway;
                                route_gw->dst_prefixlen = 32;
                                route_gw->scope = RT_SCOPE_LINK;

                                route_drop(route_gw, link,
                                           &link_route_drop_handler);
                        }

                        r = route_new_dynamic(&route, RTPROT_UNSPEC);
                        if (r >= 0) {
                                route->family = AF_INET;
                                route->in_addr.in = gateway;

                                route_drop(route, link,
                                           &link_route_drop_handler);
                        }
                }

                r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
                if (r >= 0) {
                        r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
                        if (r >= 0)
                                prefixlen = in_addr_netmask_to_prefixlen(&netmask);

                        address->family = AF_INET;
                        address->in_addr.in = addr;
                        address->prefixlen = prefixlen;

                        address_drop(address, link, &link_address_drop_handler);
                }
        }

        if (link->network->dhcp_mtu) {
                uint16_t mtu;

                r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
                if (r >= 0 && link->original_mtu != mtu) {
                        r = link_set_mtu(link, link->original_mtu);
                        if (r < 0) {
                                log_link_warning(link,
                                                 "DHCP error: could not reset MTU");
                                link_enter_failed(link);
                                return r;
                        }
                }
        }

        if (link->network->dhcp_hostname) {
                const char *hostname = NULL;

                if (!link->network->hostname)
                        r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
                else
                        hostname = link->network->hostname;

                if (r >= 0 || hostname) {
                        r = link_set_hostname(link, hostname);
                        if (r < 0)
                                log_link_error_errno(link, r,
                                                     "Failed to set transient hostname to '%s': %m",
                                                     hostname);

                }
        }

        link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
        link->dhcp4_configured = false;

        return 0;
}