#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
+#ifdef INET6
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_addr.h>
+#endif
+
#include "pppd.h"
#include "fsm.h"
#include "ipcp.h"
static int if6_is_up; /* Interface has been marked up for IPv6, to help differentiate */
static int have_default_route; /* Gateway for default route added */
static int have_default_route6; /* Gateway for default IPv6 route added */
+static struct rtentry old_def_rt; /* Old default route */
+static int default_rt_repl_rest; /* replace and restore old default rt */
static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
static char proxy_arp_dev[16]; /* Device for proxy arp entry */
static u_int32_t our_old_addr; /* for detecting address changes */
p = NULL;
}
+ SET_SA_FAMILY (rt->rt_dst, AF_INET);
+ SET_SA_FAMILY (rt->rt_gateway, AF_INET);
+
SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
/********************************************************************
*
* sifdefaultroute - assign a default route through the address given.
+ *
+ * If the global default_rt_repl_rest flag is set, then this function
+ * already replaced the original system defaultroute with some other
+ * route and it should just replace the current defaultroute with
+ * another one, without saving the current route. Use: demand mode,
+ * when pppd sets first a defaultroute it it's temporary ppp0 addresses
+ * and then changes the temporary addresses to the addresses for the real
+ * ppp connection when it has come up.
*/
-int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
+int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway, bool replace)
{
- struct rtentry rt;
+ struct rtentry rt, tmp_rt;
+ struct rtentry *del_rt = NULL;
- if (defaultroute_exists(&rt, dfl_route_metric) && strcmp(rt.rt_dev, ifname) != 0) {
- if (rt.rt_flags & RTF_GATEWAY)
- error("not replacing existing default route via %I with metric %d",
- SIN_ADDR(rt.rt_gateway), dfl_route_metric);
- else
- error("not replacing existing default route through %s with metric %d",
- rt.rt_dev, dfl_route_metric);
- return 0;
+ if (default_rt_repl_rest) {
+ /* We have already replaced the original defaultroute, if we
+ * are called again, we will delete the current default route
+ * and set the new default route in this function.
+ * - this is normally only the case the doing demand: */
+ if (defaultroute_exists(&tmp_rt, -1))
+ del_rt = &tmp_rt;
+ } else if (defaultroute_exists(&old_def_rt, -1 ) &&
+ strcmp( old_def_rt.rt_dev, ifname) != 0) {
+ /*
+ * We did not yet replace an existing default route, let's
+ * check if we should save and replace a default route:
+ */
+ u_int32_t old_gateway = SIN_ADDR(old_def_rt.rt_gateway);
+
+ if (old_gateway != gateway) {
+ if (!replace) {
+ error("not replacing default route to %s [%I]",
+ old_def_rt.rt_dev, old_gateway);
+ return 0;
+ } else {
+ /* we need to copy rt_dev because we need it permanent too: */
+ char * tmp_dev = malloc(strlen(old_def_rt.rt_dev)+1);
+ strcpy(tmp_dev, old_def_rt.rt_dev);
+ old_def_rt.rt_dev = tmp_dev;
+
+ notice("replacing old default route to %s [%I]",
+ old_def_rt.rt_dev, old_gateway);
+ default_rt_repl_rest = 1;
+ del_rt = &old_def_rt;
+ }
+ }
}
memset (&rt, 0, sizeof (rt));
error("default route ioctl(SIOCADDRT): %m");
return 0;
}
+ if (default_rt_repl_rest && del_rt)
+ if (ioctl(sock_fd, SIOCDELRT, del_rt) < 0) {
+ if ( ! ok_error ( errno ))
+ error("del old default route ioctl(SIOCDELRT): %m(%d)", errno);
+ return 0;
+ }
have_default_route = 1;
return 1;
return 0;
}
}
+ if (default_rt_repl_rest) {
+ notice("restoring old default route to %s [%I]",
+ old_def_rt.rt_dev, SIN_ADDR(old_def_rt.rt_gateway));
+ if (ioctl(sock_fd, SIOCADDRT, &old_def_rt) < 0) {
+ if ( ! ok_error ( errno ))
+ error("restore default route ioctl(SIOCADDRT): %m(%d)", errno);
+ return 0;
+ }
+ default_rt_repl_rest = 0;
+ }
return 1;
}
}
/*
- * get_first_ethernet - return the name of the first ethernet-style
- * interface on this system.
+ * get_first_ether_hwaddr - get the hardware address for the first
+ * ethernet-style interface on this system.
*/
-static char first_ether_name[IF_NAMESIZE];
-char *
-get_first_ethernet(void)
+int
+get_first_ether_hwaddr(u_char *addr)
{
struct if_nameindex *if_ni, *i;
struct ifreq ifreq;
sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (sock_fd < 0)
- return NULL;
+ return -1;
if_ni = if_nameindex();
if (!if_ni) {
close(sock_fd);
- return NULL;
+ return -1;
}
- first_ether_name[0] = 0;
+ ret = -1;
for (i = if_ni; !(i->if_index == 0 && i->if_name == NULL); i++) {
memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
strlcpy(ifreq.ifr_name, i->if_name, sizeof(ifreq.ifr_name));
ret = ioctl(sock_fd, SIOCGIFHWADDR, &ifreq);
if (ret >= 0 && ifreq.ifr_hwaddr.sa_family == ARPHRD_ETHER) {
- strlcpy(first_ether_name, i->if_name, sizeof(first_ether_name));
+ memcpy(addr, ifreq.ifr_hwaddr.sa_data, 6);
break;
}
+ ret = -1;
}
if_freenameindex(if_ni);
close(sock_fd);
- if (!first_ether_name[0])
- return NULL;
-
- return first_ether_name;
+ return ret;
}
/********************************************************************
}
#ifdef INET6
+static int append_peer_ipv6_address(unsigned int iface, struct in6_addr *local_addr, struct in6_addr *remote_addr)
+{
+ struct msghdr msg;
+ struct sockaddr_nl sa;
+ struct iovec iov;
+ struct nlmsghdr *nlmsg;
+ struct ifaddrmsg *ifa;
+ struct rtattr *local_rta;
+ struct rtattr *remote_rta;
+ char buf[NLMSG_LENGTH(sizeof(*ifa) + RTA_LENGTH(sizeof(*local_addr)) + RTA_LENGTH(sizeof(*remote_addr)))];
+ ssize_t nlmsg_len;
+ struct nlmsgerr *errmsg;
+ int one;
+ int fd;
+
+ fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (fd < 0)
+ return 0;
+
+ /* do not ask for error message content */
+ one = 1;
+ setsockopt(fd, SOL_NETLINK, NETLINK_CAP_ACK, &one, sizeof(one));
+
+ memset(&sa, 0, sizeof(sa));
+ sa.nl_family = AF_NETLINK;
+ sa.nl_pid = 0;
+ sa.nl_groups = 0;
+
+ if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
+ close(fd);
+ return 0;
+ }
+
+ memset(buf, 0, sizeof(buf));
+
+ nlmsg = (struct nlmsghdr *)buf;
+ nlmsg->nlmsg_len = NLMSG_LENGTH(sizeof(*ifa) + RTA_LENGTH(sizeof(*local_addr)) + RTA_LENGTH(sizeof(*remote_addr)));
+ nlmsg->nlmsg_type = RTM_NEWADDR;
+ nlmsg->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_REPLACE;
+ nlmsg->nlmsg_seq = 1;
+ nlmsg->nlmsg_pid = 0;
+
+ ifa = NLMSG_DATA(nlmsg);
+ ifa->ifa_family = AF_INET6;
+ ifa->ifa_prefixlen = 128;
+ ifa->ifa_flags = 0;
+ ifa->ifa_scope = RT_SCOPE_UNIVERSE;
+ ifa->ifa_index = iface;
+
+ local_rta = IFA_RTA(ifa);
+ local_rta->rta_len = RTA_LENGTH(sizeof(*local_addr));
+ local_rta->rta_type = IFA_LOCAL;
+ memcpy(RTA_DATA(local_rta), local_addr, sizeof(*local_addr));
+
+ remote_rta = (struct rtattr *)((char *)local_rta + local_rta->rta_len);
+ remote_rta->rta_len = RTA_LENGTH(sizeof(*remote_addr));
+ remote_rta->rta_type = IFA_ADDRESS;
+ memcpy(RTA_DATA(remote_rta), remote_addr, sizeof(*remote_addr));
+
+ memset(&sa, 0, sizeof(sa));
+ sa.nl_family = AF_NETLINK;
+ sa.nl_pid = 0;
+ sa.nl_groups = 0;
+
+ memset(&iov, 0, sizeof(iov));
+ iov.iov_base = nlmsg;
+ iov.iov_len = nlmsg->nlmsg_len;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = &sa;
+ msg.msg_namelen = sizeof(sa);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ if (sendmsg(fd, &msg, 0) < 0) {
+ close(fd);
+ return 0;
+ }
+
+ memset(&iov, 0, sizeof(iov));
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ nlmsg_len = recvmsg(fd, &msg, 0);
+ close(fd);
+
+ if (nlmsg_len < 0)
+ return 0;
+
+ if ((size_t)nlmsg_len < sizeof(*nlmsg)) {
+ errno = EINVAL;
+ return 0;
+ }
+
+ nlmsg = (struct nlmsghdr *)buf;
+
+ /* acknowledgment packet for NLM_F_ACK is NLMSG_ERROR */
+ if (nlmsg->nlmsg_type != NLMSG_ERROR) {
+ errno = EINVAL;
+ return 0;
+ }
+
+ if ((size_t)nlmsg_len < NLMSG_LENGTH(sizeof(*errmsg))) {
+ errno = EINVAL;
+ return 0;
+ }
+
+ errmsg = NLMSG_DATA(nlmsg);
+
+ /* error == 0 indicates success */
+ if (errmsg->error == 0)
+ return 1;
+
+ errno = -errmsg->error;
+ return 0;
+}
+
/********************************************************************
*
* sif6addr - Config the interface with an IPv6 link-local address
struct in6_ifreq ifr6;
struct ifreq ifr;
struct in6_rtmsg rt6;
+ struct in6_addr remote_addr;
if (sock6_fd < 0) {
errno = -sock6_fd;
return 0;
}
- /* Route to remote host */
- memset(&rt6, 0, sizeof(rt6));
- IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
- rt6.rtmsg_flags = RTF_UP;
- rt6.rtmsg_dst_len = 128;
- rt6.rtmsg_ifindex = ifr.ifr_ifindex;
- rt6.rtmsg_metric = 1;
+ if (kernel_version >= KVERSION(2,1,16)) {
+ /* Set remote peer address (and route for it) */
+ IN6_LLADDR_FROM_EUI64(remote_addr, his_eui64);
+ if (!append_peer_ipv6_address(ifr.ifr_ifindex, &ifr6.ifr6_addr, &remote_addr)) {
+ error("sif6addr: setting remote peer address failed: %m");
+ return 0;
+ }
+ }
- if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
- error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
- return 0;
+ if (kernel_version < KVERSION(2,1,16)) {
+ /* Route to remote host */
+ memset(&rt6, 0, sizeof(rt6));
+ IN6_LLADDR_FROM_EUI64(rt6.rtmsg_dst, his_eui64);
+ rt6.rtmsg_flags = RTF_UP;
+ rt6.rtmsg_dst_len = 128;
+ rt6.rtmsg_ifindex = ifr.ifr_ifindex;
+ rt6.rtmsg_metric = 1;
+
+ if (ioctl(sock6_fd, SIOCADDRT, &rt6) < 0) {
+ error("sif6addr: ioctl(SIOCADDRT): %m (line %d)", __LINE__);
+ return 0;
+ }
}
return 1;
projects / ppp.git / blobdiff