From bc286c00ea02ab53cc8b6001da79d01735bd9f07 Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Mon, 14 Jul 2008 13:02:27 -0700
Subject: [PATCH] netdev: add ability to set IPv4 addresses and add a default
gateway.
---
include/netdev.h | 2 ++
lib/netdev.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 71 insertions(+)
diff --git a/include/netdev.h b/include/netdev.h
index 33f549a44..e58a90dd9 100644
--- a/include/netdev.h
+++ b/include/netdev.h
@@ -71,6 +71,8 @@ int netdev_get_mtu(const struct netdev *);
int netdev_get_speed(const struct netdev *);
uint32_t netdev_get_features(const struct netdev *);
bool netdev_get_in4(const struct netdev *, struct in_addr *);
+int netdev_set_in4(struct netdev *, struct in_addr addr, struct in_addr mask);
+int netdev_add_router(struct netdev *, struct in_addr router);
bool netdev_get_in6(const struct netdev *, struct in6_addr *);
int netdev_get_flags(const struct netdev *, enum netdev_flags *);
int netdev_set_flags(struct netdev *, enum netdev_flags, bool permanent);
diff --git a/lib/netdev.c b/lib/netdev.c
index b61959409..34c7747dd 100644
--- a/lib/netdev.c
+++ b/lib/netdev.c
@@ -538,6 +538,75 @@ netdev_get_in4(const struct netdev *netdev, struct in_addr *in4)
return in4->s_addr != INADDR_ANY;
}
+static void
+make_in4_sockaddr(struct sockaddr *sa, struct in_addr addr)
+{
+ struct sockaddr_in sin;
+ memset(&sin, 0, sizeof sin);
+ sin.sin_family = AF_INET;
+ sin.sin_addr = addr;
+ sin.sin_port = 0;
+
+ memset(sa, 0, sizeof *sa);
+ memcpy(sa, &sin, sizeof sin);
+}
+
+static int
+do_set_addr(struct netdev *netdev, int sock,
+ int ioctl_nr, const char *ioctl_name, struct in_addr addr)
+{
+ struct ifreq ifr;
+ int error;
+
+ strncpy(ifr.ifr_name, netdev->name, sizeof ifr.ifr_name);
+ make_in4_sockaddr(&ifr.ifr_addr, addr);
+ error = ioctl(sock, ioctl_nr, &ifr) < 0 ? errno : 0;
+ if (error) {
+ VLOG_WARN("ioctl(%s): %s", ioctl_name, strerror(error));
+ }
+ return error;
+}
+
+/* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
+ * 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
+ * positive errno value. */
+int
+netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
+{
+ int error;
+
+ error = do_set_addr(netdev, af_inet_sock,
+ SIOCSIFADDR, "SIOCSIFADDR", addr);
+ if (!error) {
+ netdev->in4 = addr;
+ if (addr.s_addr != INADDR_ANY) {
+ error = do_set_addr(netdev, af_inet_sock,
+ SIOCSIFNETMASK, "SIOCSIFNETMASK", mask);
+ }
+ }
+ return error;
+}
+
+/* Adds 'router' as a default gateway for 'netdev''s IP address. */
+int
+netdev_add_router(struct netdev *netdev, struct in_addr router)
+{
+ struct in_addr any = { INADDR_ANY };
+ struct rtentry rt;
+ int error;
+
+ memset(&rt, 0, sizeof rt);
+ make_in4_sockaddr(&rt.rt_dst, any);
+ make_in4_sockaddr(&rt.rt_gateway, router);
+ make_in4_sockaddr(&rt.rt_genmask, any);
+ rt.rt_flags = RTF_UP | RTF_GATEWAY;
+ error = ioctl(af_inet_sock, SIOCADDRT, &rt) < 0 ? errno : 0;
+ if (error) {
+ VLOG_WARN("ioctl(SIOCADDRT): %s", strerror(error));
+ }
+ return error;
+}
+
/* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and
* returns true. Otherwise, returns false. */
bool
--
2.47.0