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Pouria Mousavizadeh Tehrani
37fd3fcaaf
Accept and validate the ipv6only option. When dhclient receives this option and IPv6 connectivity is available, stop the DHCP configuration process and wait for the duration specified by the option before restarting DHCP discovery. If the address was previously leased, disassociate it and send a DHCPRELEASE packet. Use netlink to check for IPv6 connectivity. Also, unregister ignored options from default PRL. Reviewed by: ziaee, kfv Tested by: Marek Zarychta <[email protected]> Relnotes: yes Differential Revision: https://reviews.freebsd.org/D56637
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/*
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* Copyright (c) 2026 Pouria Mousavizadeh Tehrani <[email protected]>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#ifndef WITHOUT_NETLINK
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#include <netlink/netlink.h>
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#include <netlink/netlink_route.h>
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#include <netlink/netlink_snl.h>
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#include <netlink/netlink_snl_route.h>
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#include <netlink/netlink_snl_route_compat.h>
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#include <netlink/netlink_snl_route_parsers.h>
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#endif
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#include "dhcpd.h"
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#ifndef WITHOUT_NETLINK
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/*
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* Check if the interface has a routable IPv6 address, if true
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* assume it has IPv6 connectivity.
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* Returns true if a unicast IPv6 address with non-link-local scope
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* is found, false otherwise.
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*/
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static bool
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check_ipv6_address(struct snl_state *ss, uint16_t ifindex)
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{
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struct snl_writer nw;
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struct snl_errmsg_data e = {};
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struct snl_parsed_addr addr = {};
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struct nlmsghdr *hdr, *rx_hdr;
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struct ifaddrmsg *ifahdr;
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snl_init_writer(ss, &nw);
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hdr = snl_create_msg_request(&nw, RTM_GETADDR);
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hdr->nlmsg_flags |= NLM_F_DUMP;
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ifahdr = snl_reserve_msg_object(&nw, struct ifaddrmsg);
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ifahdr->ifa_family = AF_INET6;
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ifahdr->ifa_index = ifindex;
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if ((hdr = snl_finalize_msg(&nw)) == NULL || !snl_send_message(ss, hdr))
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return (false);
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while ((rx_hdr = snl_read_reply_multi(ss, hdr->nlmsg_seq, &e)) != NULL) {
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struct sockaddr_in6 *sin6;
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if (!snl_parse_nlmsg(ss, rx_hdr, &snl_rtm_addr_parser, &addr))
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continue;
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if (addr.ifa_address != NULL) {
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sin6 = (struct sockaddr_in6 *)addr.ifa_address;
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if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
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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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/*
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* If a default route is found, assume IPv6 connectivity.
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* Returns true if found, false otherwise.
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*/
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static bool
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check_ipv6_defaultroute(struct snl_state *ss)
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{
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struct snl_writer nw;
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struct snl_parsed_route r = {};
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struct in6_addr in6 = IN6ADDR_ANY_INIT;
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struct nlmsghdr *hdr, *rx_hdr;
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struct rtmsg *rtmsg;
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snl_init_writer(ss, &nw);
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hdr = snl_create_msg_request(&nw, RTM_GETROUTE);
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rtmsg = snl_reserve_msg_object(&nw, struct rtmsg);
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rtmsg->rtm_family = AF_INET6;
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rtmsg->rtm_dst_len = 0;
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rtmsg->rtm_type = RTN_UNICAST;
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rtmsg->rtm_flags = RTM_F_PREFIX;
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snl_add_msg_attr_ip6(&nw, RTA_DST, &in6);
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if ((hdr = snl_finalize_msg(&nw)) == NULL || !snl_send_message(ss, hdr))
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return (false);
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rx_hdr = snl_read_reply(ss, hdr->nlmsg_seq);
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if (rx_hdr == NULL || rx_hdr->nlmsg_type != NL_RTM_NEWROUTE)
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return (false);
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if (!snl_parse_nlmsg(ss, rx_hdr, &snl_rtm_route_parser, &r))
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return (false);
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if (r.rta_gw == NULL)
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return (false);
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return (true);
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}
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#endif
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bool
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check_ipv6_connectivity(uint16_t ifindex __unused)
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{
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bool ret = false;
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#ifndef WITHOUT_NETLINK
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/* Return true if the interface has a routable ipv6 address */
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ret = check_ipv6_address(&nl_ss, ifindex);
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/* A default route using a link-local address may exist. */
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if (!ret)
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ret = check_ipv6_defaultroute(&nl_ss);
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snl_clear_lb(&nl_ss);
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#endif
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return (ret);
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}
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