From 8b5af11ebe1211861b422cc6737219c28594eecd Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sat, 1 Jun 2019 12:30:14 +0200
Subject: device: move more common functions

---
 src/device-common.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)

(limited to 'src/device-common.c')

diff --git a/src/device-common.c b/src/device-common.c
index 4a10bf5..9e7605e 100644
--- a/src/device-common.c
+++ b/src/device-common.c
@@ -1,4 +1,5 @@
 #include "device-common.h"
+#include "netlink.h"
 #include "util.h"
 
 #include <assert.h>
@@ -9,6 +10,10 @@
 
 #include <arpa/inet.h>
 
+#include <linux/if.h>
+#include <linux/if_link.h>
+#include <linux/rtnetlink.h>
+
 static unsigned long strtoul_safe(const char *str) {
 	char *endptr;
 
@@ -119,3 +124,110 @@ bool device_common_process_config(device_common_t *device, struct json_object *c
 
 	return true;
 }
+
+static bool device_common_set_link_flags(unsigned ifindex, unsigned change, unsigned flags) {
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+
+	struct mnl_socket *nl = nl_socket();
+
+	struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
+	nlh->nlmsg_type	= RTM_SETLINK;
+	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+	int seq = nlh->nlmsg_seq = nl_seq();
+
+	struct ifinfomsg *ifi = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifi));
+	ifi->ifi_index = ifindex;
+	ifi->ifi_family = AF_UNSPEC;
+
+	ifi->ifi_change = change;
+	ifi->ifi_flags = flags;
+
+	if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+		perror("mnl_socket_sendto");
+		return false;
+	}
+
+	int ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	if (ret == -1) {
+		perror("mnl_socket_recvfrom");
+		return false;
+	}
+
+	ret = mnl_cb_run(buf, ret, seq, mnl_socket_get_portid(nl), NULL, NULL);
+	if (ret == -1) {
+		perror("mnl_cb_run");
+		return false;
+	}
+
+	return true;
+}
+
+static bool device_common_set_link_state(unsigned ifindex, bool up) {
+	return device_common_set_link_flags(ifindex, IFF_UP, up ? IFF_UP : 0);
+}
+
+static bool device_common_set_ipaddr(unsigned ifindex, ipaddr_prefix_t *addr, bool add) {
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+
+	struct mnl_socket *nl = nl_socket();
+
+	struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
+	nlh->nlmsg_type	= add ? RTM_NEWADDR : RTM_DELADDR;
+	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+	if (add)
+		nlh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
+
+	int seq = nlh->nlmsg_seq = nl_seq();
+
+	struct ifaddrmsg *ifa = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifa));
+	ifa->ifa_index = ifindex;
+	ifa->ifa_family = addr->addr.af;
+
+	ifa->ifa_prefixlen = addr->plen;
+
+	switch (addr->addr.af) {
+	case AF_INET:
+		mnl_attr_put(nlh, IFA_LOCAL, 4, &addr->addr.addr4);
+		break;
+
+	case AF_INET6:
+		mnl_attr_put(nlh, IFA_LOCAL, 16, &addr->addr.addr6);
+		break;
+
+	default:
+		errno = EINVAL;
+		return false;
+	}
+
+	if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+		perror("mnl_socket_sendto");
+		return false;
+	}
+
+	int ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	if (ret == -1) {
+		perror("mnl_socket_recvfrom");
+		return false;
+	}
+
+	ret = mnl_cb_run(buf, ret, seq, mnl_socket_get_portid(nl), NULL, NULL);
+	if (ret == -1) {
+		perror("mnl_cb_run");
+		return false;
+	}
+
+	return true;
+}
+void device_common_init(device_common_t *device, int ifindex) {
+	device_common_set_link_state(ifindex, true);
+
+	for (size_t i = 0; i < VECTOR_LEN(device->addrs); i++)
+		device_common_set_ipaddr(ifindex, &VECTOR_INDEX(device->addrs, i), true);
+}
+
+void device_common_release(device_common_t *device, int ifindex) {
+	for (size_t i = 0; i < VECTOR_LEN(device->addrs); i++)
+		device_common_set_ipaddr(ifindex, &VECTOR_INDEX(device->addrs, i), false);
+
+	device_common_set_link_state(ifindex, false);
+}
-- 
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