mirror of
https://github.com/pi-hole/dnsmasq.git
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Accumulated 2.60 changes going into git
This commit is contained in:
Simon Kelley
220
src/dhcp6.c
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220
src/dhcp6.c
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/* dnsmasq is Copyright (c) 2000-2011 Simon Kelley
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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; version 2 dated June, 1991, or
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(at your option) version 3 dated 29 June, 2007.
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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 "dnsmasq.h"
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#ifdef HAVE_DHCP6
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struct iface_param {
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struct dhcp_context *current;
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int ind;
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};
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static int join_multicast(struct in6_addr *local, int prefix,
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int scope, int if_index, void *vparam);
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static int complete_context6(struct in6_addr *local, int prefix,
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int scope, int if_index, void *vparam);
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void dhcp6_init(void)
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{
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int fd;
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struct sockaddr_in6 saddr;
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int class = IPTOS_CLASS_CS6;
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if ((fd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == -1 ||
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setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &class, sizeof(class)) == -1 ||
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!fix_fd(fd) ||
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!set_ipv6pktinfo(fd))
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die (_("cannot create DHCPv6 socket: %s"), NULL, EC_BADNET);
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memset(&saddr, 0, sizeof(saddr));
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#ifdef HAVE_SOCKADDR_SA_LEN
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saddr.sin6_len = sizeof(addr.in6);
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#endif
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saddr.sin6_family = AF_INET6;
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saddr.sin6_addr = in6addr_any;
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saddr.sin6_port = htons(DHCPV6_SERVER_PORT);
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if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in6)))
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die(_("failed to bind DHCPv6 server socket: %s"), NULL, EC_BADNET);
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/* join multicast groups on each interface we're interested in */
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if (!iface_enumerate(AF_INET6, &fd, join_multicast))
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die(_("failed to join DHCPv6 multicast group: %s"), NULL, EC_BADNET);
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daemon->dhcp6fd = fd;
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}
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static int join_multicast(struct in6_addr *local, int prefix,
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int scope, int if_index, void *vparam)
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{
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char ifrn_name[IFNAMSIZ];
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struct ipv6_mreq mreq;
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struct in6_addr maddr;
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int fd = *((int *)vparam);
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struct dhcp_context *context;
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struct iname *tmp;
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(void)prefix;
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(void)scope; /* warnings */
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if (!indextoname(fd, if_index, ifrn_name))
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return 0;
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/* Are we doing DHCP on this interface? */
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if (!iface_check(AF_INET6, (struct all_addr *)local, ifrn_name))
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return 1;
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for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
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if (tmp->name && (strcmp(tmp->name, ifrn_name) == 0))
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return 1;
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/* weird libvirt-inspired access control */
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for (context = daemon->dhcp; context; context = context->next)
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if (!context->interface || strcmp(context->interface, ifrn_name) == 0)
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break;
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if (!context)
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return 1;
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mreq.ipv6mr_interface = if_index;
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inet_pton(AF_INET6, ALL_RELAY_AGENTS_AND_SERVERS, &maddr);
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if (!setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
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return 0;
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inet_pton(AF_INET6, ALL_SERVERS, &maddr);
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if (!setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
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return 0;
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return 1;
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}
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void dhcp6_packet(time_t now)
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{
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struct dhcp_context *context;
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struct iface_param parm;
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struct cmsghdr *cmptr;
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struct msghdr msg;
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int if_index = 0;
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union {
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struct cmsghdr align; /* this ensures alignment */
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char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
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} control_u;
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union mysockaddr from;
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struct all_addr dest;
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ssize_t sz;
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struct ifreq ifr;
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struct iname *tmp;
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msg.msg_control = control_u.control6;
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msg.msg_controllen = sizeof(control_u);
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msg.msg_flags = 0;
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msg.msg_name = &from;
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msg.msg_namelen = sizeof(from);
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msg.msg_iov = &daemon->dhcp_packet;
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msg.msg_iovlen = 1;
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if ((sz = recv_dhcp_packet(daemon->dhcp6fd, &msg) == -1) || sz <= 4)
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return;
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for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
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if (cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == daemon->v6pktinfo)
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{
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union {
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unsigned char *c;
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struct in6_pktinfo *p;
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} p;
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p.c = CMSG_DATA(cmptr);
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if_index = p.p->ipi6_ifindex;
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dest.addr.addr6 = p.p->ipi6_addr;
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}
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if (!indextoname(daemon->dhcp6fd, if_index, ifr.ifr_name))
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return;
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ls -l
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if (!iface_check(AF_INET6, (struct all_addr *)&dest, ifr.ifr_name))
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return;
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for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
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if (tmp->name && (strcmp(tmp->name, ifr.ifr_name) == 0))
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return;
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/* weird libvirt-inspired access control */
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for (context = daemon->dhcp; context; context = context->next)
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if (!context->interface || strcmp(context->interface, ifr.ifr_name) == 0)
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break;
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if (!context)
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return;
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/* unlinked contexts are marked by context->current == context */
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for (context = daemon->dhcp; context; context = context->next)
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context->current = context;
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parm.current = NULL;
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parm.ind = if_index;
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if (!iface_enumerate(AF_INET6, &parm, complete_context6))
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return;
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lease_prune(NULL, now); /* lose any expired leases */
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msg.msg_iov = &daemon->dhcp_packet;
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sz = dhcp6_reply(parm.current, sz);
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/* ifr.ifr_name, if_index, (size_t)sz,
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now, unicast_dest, &is_inform, pxe_fd, iface_addr); */
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lease_update_file(now);
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lease_update_dns();
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if (sz != 0)
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send_from(daemon->dhcp6fd, 0, daemon->outpacket.iov_base, sz, &from, &dest, if_index);
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}
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static int complete_context6(struct in6_addr *local, int prefix,
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int scope, int if_index, void *vparam)
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{
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struct dhcp_context *context;
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struct iface_param *param = vparam;
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for (context = daemon->dhcp6; context; context = context->next)
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{
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if ((context->flags & CONTEXT_IPV6) &&
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prefix == context->prefix &&
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is_same_net6(local, &context->start6, prefix) &&
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is_same_net6(local, &context->end6, prefix))
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{
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/* link it onto the current chain if we've not seen it before */
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if (if_index == param->ind && context->current == context)
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{
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context->current = param->current;
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param->current = context;
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}
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}
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}
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return 1;
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}
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#endif
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