[CRIU] [PATCH v4 4/8] save net device confs bunched with criu sysctl API

[Pavel Tikhomirov]

Signed-off-by: Pavel Tikhomirov <ptikhomirov at parallels.com>
---
 net.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/net.c b/net.c
index def4fdc..f56f095 100644
--- a/net.c
+++ b/net.c
@@ -18,6 +18,7 @@
 #include "tun.h"
 #include "util-pie.h"
 #include "plugin.h"
+#include "sysctl.h"
 
 #include "protobuf.h"
 #include "protobuf/netdev.pb-c.h"
@@ -78,6 +79,42 @@ char *devconfs[] = {
 };
 
 #define NET_DEV_CONF_SIZE 27
+#define NET_CONF_PATH "net/ipv4/conf"
+
+static int ipv4_conf_op(char *tgt, int *conf, int op)
+{
+	int ret;
+	int i, j;
+	struct sysctl_req req[NET_DEV_CONF_SIZE + 1];
+	int sdir = strlen(tgt) + strlen(NET_CONF_PATH) + 1;
+
+	for (i = 0; devconfs[i]; i++) {
+		char *path;
+		int size = sdir + strlen(devconfs[i]) + 2;
+
+		path = xmalloc(size);
+		if (!path) {
+			ret = -1;
+			goto free;
+		}
+		snprintf(path, size, "%s/%s/%s", NET_CONF_PATH, tgt, devconfs[i]);
+
+		req[i].name = path;
+		req[i].arg = &conf[i];
+		req[i].type = CTL_32;
+	}
+	req[i].name = NULL;
+
+	ret = sysctl_op(req, op);
+	if (ret < 0)
+		pr_err("Failed to read %s/<confs>\n", tgt);
+free:
+	for (j = 0; j < i; j++)
+		xfree(req[j].name);
+	if (ret < 0)
+		return -1;
+	return 0;
+}
 
 int write_netdev_img(NetDeviceEntry *nde, struct cr_fdset *fds)
 {
@@ -88,6 +125,7 @@ static int dump_one_netdev(int type, struct ifinfomsg *ifi,
 		struct rtattr **tb, struct cr_fdset *fds,
 		int (*dump)(NetDeviceEntry *, struct cr_fdset *))
 {
+	int ret;
 	NetDeviceEntry netdev = NET_DEVICE_ENTRY__INIT;
 
 	if (!tb[IFLA_IFNAME]) {
@@ -110,10 +148,24 @@ static int dump_one_netdev(int type, struct ifinfomsg *ifi,
 				(int)netdev.address.len, netdev.name);
 	}
 
+	netdev.n_conf = NET_DEV_CONF_SIZE;
+	netdev.conf = xmalloc(sizeof(int) * NET_DEV_CONF_SIZE);
+	if (!netdev.conf)
+		return -1;
+
+	ret = ipv4_conf_op(netdev.name, netdev.conf, CTL_READ);
+	if (ret < 0) {
+		pr_err("failed to get net device ipv4 conf");
+		goto err_free;
+	}
+
 	if (!dump)
 		dump = write_netdev_img;
 
-	return dump(&netdev, fds);
+	ret = dump(&netdev, fds);
+err_free:
+	xfree(netdev.conf);
+	return ret;
 }
 
 static char *link_kind(struct ifinfomsg *ifi, struct rtattr **tb)
-- 
1.9.3