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Implement dynamic interface discovery on *BSD

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This commit is contained in:
Simon Kelley
2013-12-09 16:50:19 +00:00
parent 56ad6c9be1
commit 1ee9be4c3f
7 changed files with 161 additions and 44 deletions
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7
CHANGELOG
View File

@@ -1,3 +1,10 @@
version 2.69
Implement dynamic interface discovery on *BSD. This allows
the contructor: syntax to be used in dhcp-range for DHCPv6
on the BSD platform. Thanks to Matthias Andree for
valuable research on how to implement this.
version 2.68
Use random addresses for DHCPv6 temporary address
allocations, instead of algorithmically determined stable

106
src/bpf.c
View File

@@ -19,9 +19,9 @@
#if defined(HAVE_BSD_NETWORK) || defined(HAVE_SOLARIS_NETWORK)
#include <ifaddrs.h>
#if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__)
#include <sys/param.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/if_ether.h>
@@ -29,7 +29,9 @@
# include <net/if_var.h>
#endif
#include <netinet/in_var.h>
#include <netinet6/in6_var.h>
#ifdef HAVE_IPV6
# include <netinet6/in6_var.h>
#endif
#ifndef SA_SIZE
#define SA_SIZE(sa) \
@@ -38,6 +40,13 @@
1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
#endif
#ifdef HAVE_BSD_NETWORK
static int del_family = 0;
static struct all_addr del_addr;
#endif
#if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__)
int arp_enumerate(void *parm, int (*callback)())
{
int mib[6];
@@ -88,7 +97,7 @@ int arp_enumerate(void *parm, int (*callback)())
return 1;
}
#endif
#endif /* defined(HAVE_BSD_NETWORK) && !defined(__APPLE__) */
int iface_enumerate(int family, void *parm, int (*callback)())
@@ -129,6 +138,10 @@ int iface_enumerate(int family, void *parm, int (*callback)())
{
struct in_addr addr, netmask, broadcast;
addr = ((struct sockaddr_in *) addrs->ifa_addr)->sin_addr;
#ifdef HAVE_BSD_NETWORK
if (del_family == AF_INET && del_addr.addr.addr4.s_addr == addr.s_addr)
continue;
#endif
netmask = ((struct sockaddr_in *) addrs->ifa_netmask)->sin_addr;
if (addrs->ifa_broadaddr)
broadcast = ((struct sockaddr_in *) addrs->ifa_broadaddr)->sin_addr;
@@ -146,6 +159,10 @@ int iface_enumerate(int family, void *parm, int (*callback)())
int i, j, prefix = 0;
u32 valid = 0xffffffff, preferred = 0xffffffff;
int flags = 0;
#ifdef HAVE_BSD_NETWORK
if (del_family == AF_INET6 && IN6_ARE_ADDR_EQUAL(&del_addr.addr.addr6, addr))
continue;
#endif
#if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__)
struct in6_ifreq ifr6;
@@ -226,7 +243,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
return ret;
}
#endif
#endif /* defined(HAVE_BSD_NETWORK) || defined(HAVE_SOLARIS_NETWORK) */
#if defined(HAVE_BSD_NETWORK) && defined(HAVE_DHCP)
@@ -345,6 +362,87 @@ void send_via_bpf(struct dhcp_packet *mess, size_t len,
while (writev(daemon->dhcp_raw_fd, iov, 4) == -1 && retry_send());
}
#endif /* defined(HAVE_BSD_NETWORK) && defined(HAVE_DHCP) */
#ifdef HAVE_BSD_NETWORK
void route_init(void)
{
/* AF_UNSPEC: all addr families */
daemon->routefd = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
if (daemon->routefd == -1 || !fix_fd(daemon->routefd))
die(_("cannot create PF_ROUTE socket: %s"), NULL, EC_BADNET);
}
void route_sock(time_t now)
{
struct if_msghdr *msg;
int rc = recv(daemon->routefd, daemon->packet, daemon->packet_buff_sz, 0);
if (rc < 4)
return;
msg = (struct if_msghdr *)daemon->packet;
if (rc < msg->ifm_msglen)
return;
if (msg->ifm_version != RTM_VERSION)
{
static int warned = 0;
if (!warned)
{
my_syslog(LOG_WARNING, _("Unknown protocol version from route socket"));
warned = 1;
}
}
else if (msg->ifm_type == RTM_NEWADDR)
{
del_family = 0;
newaddress(now);
}
else if (msg->ifm_type == RTM_DELADDR)
{
/* There's a race in the kernel, such that if we run iface_enumerate() immediately
we get a DELADDR event, the deleted address still appears. Here we store the deleted address
in a static variable, and omit it from the set returned by iface_enumerate() */
int mask = ((struct ifa_msghdr *)msg)->ifam_addrs;
int maskvec[] = { RTA_DST, RTA_GATEWAY, RTA_NETMASK, RTA_GENMASK,
RTA_IFP, RTA_IFA, RTA_AUTHOR, RTA_BRD };
int of;
unsigned int i;
for (i = 0, of = sizeof(struct ifa_msghdr); of < rc && i < sizeof(maskvec)/sizeof(maskvec[0]); i++)
if (mask & maskvec[i])
{
struct sockaddr *sa = (struct sockaddr *)((char *)msg + of);
size_t diff = (sa->sa_len != 0) ? sa->sa_len : sizeof(long);
if (maskvec[i] == RTA_IFA)
{
del_family = sa->sa_family;
if (del_family == AF_INET)
del_addr.addr.addr4 = ((struct sockaddr_in *)sa)->sin_addr;
#ifdef HAVE_IPV6
else if (del_family == AF_INET6)
del_addr.addr.addr6 = ((struct sockaddr_in6 *)sa)->sin6_addr;
#endif
else
del_family = 0;
}
of += diff;
/* round up as needed */
if (diff & (sizeof(long) - 1))
of += sizeof(long) - (diff & (sizeof(long) - 1));
}
newaddress(now);
}
}
#endif /* HAVE_BSD_NETWORK */

1
src/dhcp6.c
View File

@@ -720,7 +720,6 @@ void dhcp_construct_contexts(time_t now)
if (context->flags & CONTEXT_GC && !(context->flags & CONTEXT_OLD))
{
if ((context->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS)) ||
option_bool(OPT_RA))
{

24
src/dnsmasq.c
View File

@@ -182,7 +182,7 @@ int main (int argc, char **argv)
daemon->doing_dhcp6 = 1;
if (context->flags & CONTEXT_RA)
daemon->doing_ra = 1;
#ifndef HAVE_LINUX_NETWORK
#if !defined(HAVE_LINUX_NETWORK) && !defined(HAVE_BSD_NETWORK)
if (context->flags & CONTEXT_TEMPLATE)
die (_("dhcp-range constructor not available on this platform"), NULL, EC_BADCONF);
#endif
@@ -220,13 +220,15 @@ int main (int argc, char **argv)
ipset_init();
#endif
#ifdef HAVE_LINUX_NETWORK
#if defined(HAVE_LINUX_NETWORK)
netlink_init();
if (option_bool(OPT_NOWILD) && option_bool(OPT_CLEVERBIND))
die(_("cannot set --bind-interfaces and --bind-dynamic"), NULL, EC_BADCONF);
#elif defined(HAVE_BSD_NETWORK)
route_init();
#endif
if (option_bool(OPT_NOWILD) && option_bool(OPT_CLEVERBIND))
die(_("cannot set --bind-interfaces and --bind-dynamic"), NULL, EC_BADCONF);
if (!enumerate_interfaces(1) || !enumerate_interfaces(0))
die(_("failed to find list of interfaces: %s"), NULL, EC_MISC);
@@ -808,11 +810,14 @@ int main (int argc, char **argv)
}
#endif
#ifdef HAVE_LINUX_NETWORK
#if defined(HAVE_LINUX_NETWORK)
FD_SET(daemon->netlinkfd, &rset);
bump_maxfd(daemon->netlinkfd, &maxfd);
#elif defined(HAVE_BSD_NETWORK)
FD_SET(daemon->routefd, &rset);
bump_maxfd(daemon->routefd, &maxfd);
#endif
FD_SET(piperead, &rset);
bump_maxfd(piperead, &maxfd);
@@ -867,9 +872,12 @@ int main (int argc, char **argv)
warn_bound_listeners();
}
#ifdef HAVE_LINUX_NETWORK
#if defined(HAVE_LINUX_NETWORK)
if (FD_ISSET(daemon->netlinkfd, &rset))
netlink_multicast(now);
#elif defined(HAVE_BSD_NETWORK)
if (FD_ISSET(daemon->routefd, &rset))
route_sock(now);
#endif
/* Check for changes to resolv files once per second max. */

8
src/dnsmasq.h
View File

@@ -900,7 +900,7 @@ extern struct daemon {
#if defined(HAVE_LINUX_NETWORK)
int netlinkfd;
#elif defined(HAVE_BSD_NETWORK)
int dhcp_raw_fd, dhcp_icmp_fd;
int dhcp_raw_fd, dhcp_icmp_fd, routefd;
#endif
struct iovec dhcp_packet;
char *dhcp_buff, *dhcp_buff2, *dhcp_buff3;
@@ -1090,6 +1090,10 @@ int set_ipv6pktinfo(int fd);
#ifdef HAVE_DHCP6
void join_multicast(int dienow);
#endif
#if defined(HAVE_LINUX_NETWORK) || defined(HAVE_BSD_NETWORK)
void newaddress(time_t now);
#endif
/* dhcp.c */
#ifdef HAVE_DHCP
@@ -1177,6 +1181,8 @@ void netlink_multicast(time_t now);
void init_bpf(void);
void send_via_bpf(struct dhcp_packet *mess, size_t len,
struct in_addr iface_addr, struct ifreq *ifr);
void route_init(void);
void route_sock(time_t now);
#endif
/* bpf.c or netlink.c */

29
src/netlink.c
View File

@@ -39,7 +39,6 @@ static struct iovec iov;
static u32 netlink_pid;
static int nl_async(struct nlmsghdr *h);
static void nl_newaddress(time_t now);
void netlink_init(void)
{
@@ -203,7 +202,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
/* handle async new interface address arrivals, these have to be done
after we complete as we're not re-entrant */
if (newaddr)
nl_newaddress(dnsmasq_time());
newaddress(dnsmasq_time());
return callback_ok;
}
@@ -351,7 +350,7 @@ void netlink_multicast(time_t now)
fcntl(daemon->netlinkfd, F_SETFL, flags);
if (newaddr)
nl_newaddress(now);
newaddress(now);
}
static int nl_async(struct nlmsghdr *h)
@@ -399,30 +398,6 @@ static int nl_async(struct nlmsghdr *h)
return 0;
}
static void nl_newaddress(time_t now)
{
(void)now;
if (option_bool(OPT_CLEVERBIND) || daemon->doing_dhcp6 || daemon->relay6 || daemon->doing_ra)
enumerate_interfaces(0);
if (option_bool(OPT_CLEVERBIND))
create_bound_listeners(0);
#ifdef HAVE_DHCP6
if (daemon->doing_dhcp6 || daemon->relay6 || daemon->doing_ra)
join_multicast(0);
if (daemon->doing_dhcp6 || daemon->doing_ra)
dhcp_construct_contexts(now);
if (daemon->doing_dhcp6)
lease_find_interfaces(now);
#endif
}
#endif

30
src/network.c
View File

@@ -489,7 +489,7 @@ static int iface_allowed_v6(struct in6_addr *local, int prefix,
addr.in6.sin6_scope_id = if_index;
else
addr.in6.sin6_scope_id = 0;
return iface_allowed((struct iface_param *)vparam, if_index, NULL, &addr, netmask, prefix, !!(flags & IFACE_TENTATIVE));
}
#endif
@@ -681,7 +681,7 @@ static int make_sock(union mysockaddr *addr, int type, int dienow)
close (fd);
errno = errsav;
if (dienow)
{
/* failure to bind addresses given by --listen-address at this point
@@ -1470,7 +1470,31 @@ int reload_servers(char *fname)
return gotone;
}
#if defined(HAVE_LINUX_NETWORK) || defined(HAVE_BSD_NETWORK)
/* Called when addresses are added or deleted from an interface */
void newaddress(time_t now)
{
(void)now;
if (option_bool(OPT_CLEVERBIND) || daemon->doing_dhcp6 || daemon->relay6 || daemon->doing_ra)
enumerate_interfaces(0);
if (option_bool(OPT_CLEVERBIND))
create_bound_listeners(0);
#ifdef HAVE_DHCP6
if (daemon->doing_dhcp6 || daemon->relay6 || daemon->doing_ra)
join_multicast(0);
if (daemon->doing_dhcp6 || daemon->doing_ra)
dhcp_construct_contexts(now);
if (daemon->doing_dhcp6)
lease_find_interfaces(now);
#endif
}
#endif