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-rw-r--r--lib/netdev.c766
1 files changed, 766 insertions, 0 deletions
diff --git a/lib/netdev.c b/lib/netdev.c
new file mode 100644
index 0000000..eff808d
--- /dev/null
+++ b/lib/netdev.c
@@ -0,0 +1,766 @@
+/*
+ * TUN interface functions.
+ * Copyright (C) 2002, 2003, 2004 Mondru AB.
+ * Copyright (C) 2017-2018 by Harald Welte <laforge@gnumonks.org>
+ *
+ * The contents of this file may be used under the terms of the GNU
+ * General Public License Version 2, provided that the above copyright
+ * notice and this permission notice is included in all copies or
+ * substantial portions of the software.
+ *
+ */
+
+/*
+ * netdev.c: Contains generic network device related functionality.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <net/route.h>
+#include <net/if.h>
+
+#if defined(__linux__)
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#elif defined (__FreeBSD__)
+#include <net/if_var.h>
+#include <netinet/in_var.h>
+
+#elif defined (__APPLE__)
+#include <net/if.h>
+
+#else
+#error "Unknown platform!"
+#endif
+
+#include "netdev.h"
+#include "syserr.h"
+
+#if defined(__linux__)
+
+#include <linux/ipv6.h>
+
+static int netdev_nlattr(struct nlmsghdr *n, int nsize, int type, void *d, int dlen)
+{
+ int len = RTA_LENGTH(dlen);
+ int alen = NLMSG_ALIGN(n->nlmsg_len);
+ struct rtattr *rta = (struct rtattr *)(((void *)n) + alen);
+ if (alen + len > nsize)
+ return -1;
+ rta->rta_len = len;
+ rta->rta_type = type;
+ memcpy(RTA_DATA(rta), d, dlen);
+ n->nlmsg_len = alen + len;
+ return 0;
+}
+#endif
+
+static int netdev_sifflags(const char *devname, int flags)
+{
+ struct ifreq ifr;
+ int fd;
+
+ memset(&ifr, '\0', sizeof(ifr));
+ ifr.ifr_flags = flags;
+ strncpy(ifr.ifr_name, devname, IFNAMSIZ);
+ ifr.ifr_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+ if (ioctl(fd, SIOCSIFFLAGS, &ifr)) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCSIFFLAGS) failed");
+ close(fd);
+ return -1;
+ }
+ close(fd);
+ return 0;
+}
+
+int netdev_setaddr4(const char *devname, struct in_addr *addr,
+ struct in_addr *dstaddr, struct in_addr *netmask)
+{
+ struct ifreq ifr;
+ int fd;
+
+ memset(&ifr, '\0', sizeof(ifr));
+ ifr.ifr_addr.sa_family = AF_INET;
+ ifr.ifr_dstaddr.sa_family = AF_INET;
+
+#if defined(__linux__)
+ ifr.ifr_netmask.sa_family = AF_INET;
+
+#elif defined(__FreeBSD__) || defined (__APPLE__)
+ ((struct sockaddr_in *)&ifr.ifr_addr)->sin_len =
+ sizeof(struct sockaddr_in);
+ ((struct sockaddr_in *)&ifr.ifr_dstaddr)->sin_len =
+ sizeof(struct sockaddr_in);
+#endif
+
+ strncpy(ifr.ifr_name, devname, IFNAMSIZ);
+ ifr.ifr_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */
+
+ /* Create a channel to the NET kernel. */
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+
+ if (addr) { /* Set the interface address */
+ memcpy(&((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr, addr,
+ sizeof(*addr));
+ if (ioctl(fd, SIOCSIFADDR, (void *)&ifr) < 0) {
+ if (errno != EEXIST) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCSIFADDR) failed");
+ } else {
+ SYS_ERR(DTUN, LOGL_NOTICE, errno,
+ "ioctl(SIOCSIFADDR): Address already exists");
+ }
+ close(fd);
+ return -1;
+ }
+ }
+
+ if (dstaddr) { /* Set the destination address */
+ memcpy(&((struct sockaddr_in *)&ifr.ifr_dstaddr)->sin_addr,
+ dstaddr, sizeof(*dstaddr));
+ if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t) & ifr) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCSIFDSTADDR) failed");
+ close(fd);
+ return -1;
+ }
+ }
+
+ if (netmask) { /* Set the netmask */
+#if defined(__linux__)
+ memcpy(&((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr,
+ netmask, sizeof(*netmask));
+
+#elif defined(__FreeBSD__) || defined (__APPLE__)
+ ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr =
+ netmask->s_addr;
+#endif
+
+ if (ioctl(fd, SIOCSIFNETMASK, (void *)&ifr) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCSIFNETMASK) failed");
+ close(fd);
+ return -1;
+ }
+ }
+
+ close(fd);
+
+ /* On linux the route to the interface is set automatically
+ on FreeBSD we have to do this manually */
+
+ /* TODO: How does it work on Solaris? */
+
+ netdev_sifflags(devname, IFF_UP | IFF_RUNNING);
+
+#if defined(__FreeBSD__) || defined (__APPLE__)
+ netdev_addroute(dstaddr, addr, &this->netmask);
+#endif
+
+ return 0;
+}
+
+int netdev_setaddr6(const char *devname, struct in6_addr *addr, struct in6_addr *dstaddr,
+ size_t prefixlen)
+{
+ struct in6_ifreq ifr;
+ int fd;
+
+ memset(&ifr, 0, sizeof(ifr));
+
+#if defined(__linux__)
+ ifr.ifr6_prefixlen = prefixlen;
+ ifr.ifr6_ifindex = if_nametoindex(devname);
+ if (ifr.ifr6_ifindex == 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0, "Error getting ifindex for %s\n", devname);
+ return -1;
+ }
+#elif defined(__FreeBSD__) || defined (__APPLE__)
+ strncpy(ifr.ifr_name, devname, IFNAMSIZ);
+#endif
+
+ /* Create a channel to the NET kernel */
+ if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0, "socket() failed");
+ return -1;
+ }
+
+#if defined(__linux__)
+ if (addr) {
+ memcpy(&ifr.ifr6_addr, addr, sizeof(*addr));
+ if (ioctl(fd, SIOCSIFADDR, (void *) &ifr) < 0) {
+ if (errno != EEXIST) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR) failed");
+ } else {
+ SYS_ERR(DTUN, LOGL_NOTICE, 0, "ioctl(SIOCSIFADDR): Address already exists");
+ }
+ close(fd);
+ return -1;
+ }
+ }
+
+#if 0
+ /* FIXME: looks like this is not possible/necessary for IPv6? */
+ if (dstaddr) {
+ memcpy(&ifr.ifr6_addr, dstaddr, sizeof(*dstaddr));
+ if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t *) &ifr) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, "ioctl(SIOCSIFDSTADDR) failed");
+ close(fd);
+ return -1;
+ }
+ }
+#endif
+
+#elif defined(__FreeBSD__) || defined (__APPLE__)
+ if (addr)
+ memcpy(&ifr.ifr_ifru.ifru_addr, addr, sizeof(ifr.ifr_ifru.ifru_addr));
+ if (dstaddr)
+ memcpy(&ifr.ifr_ifru.ifru_dstaddr, dstaddr, sizeof(ifr.ifr_ifru.ifru_dstaddr));
+
+ if (ioctl(fd, SIOCSIFADDR_IN6, (struct ifreq *)&ifr) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR_IN6) failed");
+ close(fd);
+ return -1;
+ }
+#endif
+
+ close(fd);
+
+ /* On linux the route to the interface is set automatically
+ on FreeBSD we have to do this manually */
+
+ /* TODO: How does it work on Solaris? */
+
+ netdev_sifflags(devname, IFF_UP | IFF_RUNNING);
+
+#if 0 /* FIXME */
+//#if defined(__FreeBSD__) || defined (__APPLE__)
+ netdev_addroute6(dstaddr, addr, prefixlen);
+#endif
+
+ return 0;
+}
+
+int netdev_addaddr4(const char *devname, struct in_addr *addr,
+ struct in_addr *dstaddr, struct in_addr *netmask)
+{
+
+#if defined(__linux__)
+ struct {
+ struct nlmsghdr n;
+ struct ifaddrmsg i;
+ char buf[TUN_NLBUFSIZE];
+ } req;
+
+ struct sockaddr_nl local;
+ socklen_t addr_len;
+ int fd;
+ int status;
+
+ struct sockaddr_nl nladdr;
+ struct iovec iov;
+ struct msghdr msg;
+
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
+ req.n.nlmsg_type = RTM_NEWADDR;
+ req.i.ifa_family = AF_INET;
+ req.i.ifa_prefixlen = 32; /* 32 FOR IPv4 */
+ req.i.ifa_flags = 0;
+ req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */
+ req.i.ifa_index = if_nametoindex(devname);
+ if (!req.i.ifa_index) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "Unable to get ifindex for %s", devname);
+ return -1;
+ }
+
+ netdev_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(*addr));
+ if (dstaddr)
+ netdev_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(*dstaddr));
+
+ if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+
+ memset(&local, 0, sizeof(local));
+ local.nl_family = AF_NETLINK;
+ local.nl_groups = 0;
+
+ if (bind(fd, (struct sockaddr *)&local, sizeof(local)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "bind() failed");
+ close(fd);
+ return -1;
+ }
+
+ addr_len = sizeof(local);
+ if (getsockname(fd, (struct sockaddr *)&local, &addr_len) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "getsockname() failed");
+ close(fd);
+ return -1;
+ }
+
+ if (addr_len != sizeof(local)) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0,
+ "Wrong address length %d", addr_len);
+ close(fd);
+ return -1;
+ }
+
+ if (local.nl_family != AF_NETLINK) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0,
+ "Wrong address family %d", local.nl_family);
+ close(fd);
+ return -1;
+ }
+
+ iov.iov_base = (void *)&req.n;
+ iov.iov_len = req.n.nlmsg_len;
+
+ msg.msg_name = (void *)&nladdr;
+ msg.msg_namelen = sizeof(nladdr);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+ nladdr.nl_pid = 0;
+ nladdr.nl_groups = 0;
+
+ req.n.nlmsg_seq = 0;
+ req.n.nlmsg_flags |= NLM_F_ACK;
+
+ status = sendmsg(fd, &msg, 0);
+ if (status != req.n.nlmsg_len) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "sendmsg() failed, returned %d", status);
+ close(fd);
+ return -1;
+ }
+
+ status = netdev_sifflags(devname, IFF_UP | IFF_RUNNING);
+ if (status == -1) {
+ close(fd);
+ return -1;
+ }
+
+
+ close(fd);
+ return 0;
+
+#elif defined (__FreeBSD__) || defined (__APPLE__)
+
+ int fd;
+ struct ifaliasreq areq;
+
+ memset(&areq, 0, sizeof(areq));
+
+ /* Set up interface name */
+ strncpy(areq.ifra_name, devname, IFNAMSIZ);
+ areq.ifra_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */
+
+ ((struct sockaddr_in *)&areq.ifra_addr)->sin_family = AF_INET;
+ ((struct sockaddr_in *)&areq.ifra_addr)->sin_len =
+ sizeof(areq.ifra_addr);
+ ((struct sockaddr_in *)&areq.ifra_addr)->sin_addr.s_addr = addr->s_addr;
+
+ ((struct sockaddr_in *)&areq.ifra_mask)->sin_family = AF_INET;
+ ((struct sockaddr_in *)&areq.ifra_mask)->sin_len =
+ sizeof(areq.ifra_mask);
+ ((struct sockaddr_in *)&areq.ifra_mask)->sin_addr.s_addr =
+ netmask->s_addr;
+
+ /* For some reason FreeBSD uses ifra_broadcast for specifying dstaddr */
+ ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_family = AF_INET;
+ ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_len =
+ sizeof(areq.ifra_broadaddr);
+ ((struct sockaddr_in *)&areq.ifra_broadaddr)->sin_addr.s_addr =
+ dstaddr->s_addr;
+
+ /* Create a channel to the NET kernel. */
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+
+ if (ioctl(fd, SIOCAIFADDR, (void *)&areq) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCAIFADDR) failed");
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+ return 0;
+
+#endif
+
+}
+
+int netdev_addaddr6(const char *devname, struct in6_addr *addr,
+ struct in6_addr *dstaddr, int prefixlen)
+{
+
+#if defined(__linux__)
+ struct {
+ struct nlmsghdr n;
+ struct ifaddrmsg i;
+ char buf[TUN_NLBUFSIZE];
+ } req;
+
+ struct sockaddr_nl local;
+ socklen_t addr_len;
+ int fd;
+ int status;
+
+ struct sockaddr_nl nladdr;
+ struct iovec iov;
+ struct msghdr msg;
+
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
+ req.n.nlmsg_type = RTM_NEWADDR;
+ req.i.ifa_family = AF_INET6;
+ req.i.ifa_prefixlen = 64; /* 64 FOR IPv6 */
+ req.i.ifa_flags = 0;
+ req.i.ifa_scope = RT_SCOPE_HOST; /* TODO or 0 */
+ req.i.ifa_index = if_nametoindex(devname);
+ if (!req.i.ifa_index) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "Unable to get ifindex for %s", devname);
+ return -1;
+ }
+
+ netdev_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(*addr));
+ if (dstaddr)
+ netdev_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(*dstaddr));
+
+ if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+
+ memset(&local, 0, sizeof(local));
+ local.nl_family = AF_NETLINK;
+ local.nl_groups = 0;
+
+ if (bind(fd, (struct sockaddr *)&local, sizeof(local)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "bind() failed");
+ close(fd);
+ return -1;
+ }
+
+ addr_len = sizeof(local);
+ if (getsockname(fd, (struct sockaddr *)&local, &addr_len) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "getsockname() failed");
+ close(fd);
+ return -1;
+ }
+
+ if (addr_len != sizeof(local)) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0,
+ "Wrong address length %d", addr_len);
+ close(fd);
+ return -1;
+ }
+
+ if (local.nl_family != AF_NETLINK) {
+ SYS_ERR(DTUN, LOGL_ERROR, 0,
+ "Wrong address family %d", local.nl_family);
+ close(fd);
+ return -1;
+ }
+
+ iov.iov_base = (void *)&req.n;
+ iov.iov_len = req.n.nlmsg_len;
+
+ msg.msg_name = (void *)&nladdr;
+ msg.msg_namelen = sizeof(nladdr);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ memset(&nladdr, 0, sizeof(nladdr));
+ nladdr.nl_family = AF_NETLINK;
+ nladdr.nl_pid = 0;
+ nladdr.nl_groups = 0;
+
+ req.n.nlmsg_seq = 0;
+ req.n.nlmsg_flags |= NLM_F_ACK;
+
+ status = sendmsg(fd, &msg, 0);
+ if (status != req.n.nlmsg_len) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "sendmsg() failed, returned %d", status);
+ close(fd);
+ return -1;
+ }
+
+ status = netdev_sifflags(devname, IFF_UP | IFF_RUNNING);
+ if (status == -1) {
+ close(fd);
+ return -1;
+ }
+
+
+ close(fd);
+ return 0;
+
+#elif defined (__FreeBSD__) || defined (__APPLE__)
+
+ int fd;
+ struct ifaliasreq areq;
+
+ memset(&areq, 0, sizeof(areq));
+
+ /* Set up interface name */
+ strncpy(areq.ifra_name, devname, IFNAMSIZ);
+ areq.ifra_name[IFNAMSIZ - 1] = 0; /* Make sure to terminate */
+
+ ((struct sockaddr_in6 *)&areq.ifra_addr)->sin6_family = AF_INET6;
+ ((struct sockaddr_in6 *)&areq.ifra_addr)->sin6_len = sizeof(areq.ifra_addr);
+ ((struct sockaddr_in6 *)&areq.ifra_addr)->sin6_addr.s6_addr = addr->s6_addr;
+
+ ((struct sockaddr_in6 *)&areq.ifra_mask)->sin6_family = AF_INET6;
+ ((struct sockaddr_in6 *)&areq.ifra_mask)->sin6_len = sizeof(areq.ifra_mask);
+ ((struct sockaddr_in6 *)&areq.ifra_mask)->sin6_addr.s6_addr = netmask->s6_addr;
+
+ /* For some reason FreeBSD uses ifra_broadcast for specifying dstaddr */
+ ((struct sockaddr_in6 *)&areq.ifra_broadaddr)->sin6_family = AF_INET6;
+ ((struct sockaddr_in6 *)&areq.ifra_broadaddr)->sin6_len = sizeof(areq.ifra_broadaddr);
+ ((struct sockaddr_in6 *)&areq.ifra_broadaddr)->sin6_addr.s6_addr = dstaddr->s6_addr;
+
+ /* Create a channel to the NET kernel. */
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+
+ if (ioctl(fd, SIOCAIFADDR, (void *)&areq) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCAIFADDR) failed");
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+ return 0;
+
+#endif
+
+}
+
+static int netdev_route(struct in_addr *dst, struct in_addr *gateway, struct in_addr *mask, int delete)
+{
+
+#if defined(__linux__)
+
+ struct rtentry r;
+ int fd;
+
+ memset(&r, '\0', sizeof(r));
+ r.rt_flags = RTF_UP | RTF_GATEWAY; /* RTF_HOST not set */
+
+ /* Create a channel to the NET kernel. */
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+
+ r.rt_dst.sa_family = AF_INET;
+ r.rt_gateway.sa_family = AF_INET;
+ r.rt_genmask.sa_family = AF_INET;
+ memcpy(&((struct sockaddr_in *)&r.rt_dst)->sin_addr, dst, sizeof(*dst));
+ memcpy(&((struct sockaddr_in *)&r.rt_gateway)->sin_addr, gateway,
+ sizeof(*gateway));
+ memcpy(&((struct sockaddr_in *)&r.rt_genmask)->sin_addr, mask,
+ sizeof(*mask));
+
+ if (delete) {
+ if (ioctl(fd, SIOCDELRT, (void *)&r) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCDELRT) failed");
+ close(fd);
+ return -1;
+ }
+ } else {
+ if (ioctl(fd, SIOCADDRT, (void *)&r) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno,
+ "ioctl(SIOCADDRT) failed");
+ close(fd);
+ return -1;
+ }
+ }
+ close(fd);
+ return 0;
+
+#elif defined(__FreeBSD__) || defined (__APPLE__)
+
+ struct {
+ struct rt_msghdr rt;
+ struct sockaddr_in dst;
+ struct sockaddr_in gate;
+ struct sockaddr_in mask;
+ } req;
+
+ int fd;
+ struct rt_msghdr *rtm;
+
+ if ((fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");
+ return -1;
+ }
+
+ memset(&req, 0x00, sizeof(req));
+
+ rtm = &req.rt;
+
+ rtm->rtm_msglen = sizeof(req);
+ rtm->rtm_version = RTM_VERSION;
+ if (delete) {
+ rtm->rtm_type = RTM_DELETE;
+ } else {
+ rtm->rtm_type = RTM_ADD;
+ }
+ rtm->rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; /* TODO */
+ rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
+ rtm->rtm_pid = getpid();
+ rtm->rtm_seq = 0044; /* TODO */
+
+ req.dst.sin_family = AF_INET;
+ req.dst.sin_len = sizeof(req.dst);
+ req.mask.sin_family = AF_INET;
+ req.mask.sin_len = sizeof(req.mask);
+ req.gate.sin_family = AF_INET;
+ req.gate.sin_len = sizeof(req.gate);
+
+ req.dst.sin_addr.s_addr = dst->s_addr;
+ req.mask.sin_addr.s_addr = mask->s_addr;
+ req.gate.sin_addr.s_addr = gateway->s_addr;
+
+ if (write(fd, rtm, rtm->rtm_msglen) < 0) {
+ SYS_ERR(DTUN, LOGL_ERROR, errno, "write() failed");
+ close(fd);
+ return -1;
+ }
+ close(fd);
+ return 0;
+#endif
+
+}
+
+int netdev_addroute(struct in_addr *dst, struct in_addr *gateway, struct in_addr *mask)
+{
+ return netdev_route(dst, gateway, mask, 0);
+}
+
+int netdev_delroute(struct in_addr *dst, struct in_addr *gateway, struct in_addr *mask)
+{
+ return netdev_route(dst, gateway, mask, 1);
+}
+
+#include <ifaddrs.h>
+
+/*! Obtain the local address of a network device
+ * \param[in] devname Target device owning the IP
+ * \param[out] prefix_list List of prefix structures to fill with each IPv4/6 and prefix length found.
+ * \param[in] prefix_size Amount of elements allowed to be fill in the prefix_list array.
+ * \param[in] flags Specify which kind of IP to look for: IP_TYPE_IPv4, IP_TYPE_IPv6_LINK, IP_TYPE_IPv6_NONLINK
+ * \returns The number of ips found following the criteria specified by flags, -1 on error.
+ *
+ * This function will fill prefix_list with up to prefix_size IPs following the
+ * criteria specified by flags parameter. It returns the number of IPs matching
+ * the criteria. As a result, the number returned can be bigger than
+ * prefix_size. It can be used with prefix_size=0 to get an estimate of the size
+ * needed for prefix_list.
+ */
+int netdev_ip_local_get(const char *devname, struct in46_prefix *prefix_list, size_t prefix_size, int flags)
+{
+ static const uint8_t ll_prefix[] = { 0xfe,0x80, 0,0, 0,0, 0,0 };
+ struct ifaddrs *ifaddr, *ifa;
+ struct in46_addr netmask;
+ size_t count = 0;
+ bool is_ipv6_ll;
+
+ if (getifaddrs(&ifaddr) == -1) {
+ return -1;
+ }
+
+ for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+ if (ifa->ifa_addr == NULL)
+ continue;
+
+ if (strcmp(ifa->ifa_name, devname))
+ continue;
+
+ if (ifa->ifa_addr->sa_family == AF_INET && (flags & IP_TYPE_IPv4)) {
+ struct sockaddr_in *sin4 = (struct sockaddr_in *) ifa->ifa_addr;
+ struct sockaddr_in *netmask4 = (struct sockaddr_in *) ifa->ifa_netmask;
+
+ if (count < prefix_size) {
+ netmask.len = sizeof(netmask4->sin_addr);
+ netmask.v4 = netmask4->sin_addr;
+ prefix_list[count].addr.len = sizeof(sin4->sin_addr);
+ prefix_list[count].addr.v4 = sin4->sin_addr;
+ prefix_list[count].prefixlen = in46a_netmasklen(&netmask);
+ }
+ count++;
+ }
+
+ if (ifa->ifa_addr->sa_family == AF_INET6 && (flags & IP_TYPE_IPv6)) {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
+ struct sockaddr_in6 *netmask6 = (struct sockaddr_in6 *) ifa->ifa_netmask;
+
+ is_ipv6_ll = !memcmp(sin6->sin6_addr.s6_addr, ll_prefix, sizeof(ll_prefix));
+ if ((flags & IP_TYPE_IPv6_NONLINK) && is_ipv6_ll)
+ continue;
+ if ((flags & IP_TYPE_IPv6_LINK) && !is_ipv6_ll)
+ continue;
+
+ if (count < prefix_size) {
+ netmask.len = sizeof(netmask6->sin6_addr);
+ netmask.v6 = netmask6->sin6_addr;
+ prefix_list[count].addr.len = sizeof(sin6->sin6_addr);
+ prefix_list[count].addr.v6 = sin6->sin6_addr;
+ prefix_list[count].prefixlen = in46a_netmasklen(&netmask);
+ }
+ count++;
+ }
+ }
+
+ freeifaddrs(ifaddr);
+ return count;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 02:00:36 +0000