[libvirt] [PATCHv2 14/16] virNetDevAddRoute: implementation using netlink
---
src/util/virnetdev.c | 105 +++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 90 insertions(+), 15 deletions(-)
diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index e1ee130..47f3c90 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -926,6 +926,95 @@ int virNetDevSetIPAddress(const char *ifname,
return ret;
}
+/**
+ * virNetDevAddRoute:
+ * @ifname: the interface name
+ * @addr: the IP network address (IPv4 or IPv6)
+ * @prefix: number of 1 bits in the netmask
+ * @gateway: via address for route (same as @addr)
+ *
+ * Add a route for a network IP address to an interface. This function
+ * *does not* remove any previously added IP static routes.
+ *
+ * Returns 0 in case of success or -1 in case of error.
+ */
+int
+virNetDevAddRoute(const char *ifname,
+ virSocketAddrPtr addr,
+ unsigned int prefix,
+ virSocketAddrPtr gateway,
+ unsigned int metric)
+{
+ int ret = -1;
+ struct nl_msg *nlmsg = NULL;
+ struct nlmsghdr *resp = NULL;
+ unsigned int recvbuflen;
+ unsigned int ifindex;
+ struct rtmsg rtmsg;
+ void *gatewayData = NULL;
+ void *addrData = NULL;
+ size_t addrDataLen;
+ int errCode;
+
+ if (virNetDevGetIPAddressBinary(addr, &addrData, &addrDataLen) < 0 ||
+ virNetDevGetIPAddressBinary(gateway, &gatewayData, &addrDataLen) < 0)
+ goto cleanup;
+
+ /* Get the interface index */
+ if ((ifindex = if_nametoindex(ifname)) == 0)
+ goto cleanup;
+
+ if (!(nlmsg = nlmsg_alloc_simple(RTM_NEWROUTE,
+ NLM_F_REQUEST | NLM_F_CREATE |
+ NLM_F_EXCL))) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ memset(&rtmsg, 0, sizeof(rtmsg));
+
+ rtmsg.rtm_family = VIR_SOCKET_ADDR_FAMILY(addr);
+ rtmsg.rtm_table = RT_TABLE_MAIN;
+ rtmsg.rtm_scope = RT_SCOPE_UNIVERSE;
+ rtmsg.rtm_protocol = RTPROT_BOOT;
+ rtmsg.rtm_type = RTN_UNICAST;
+ rtmsg.rtm_dst_len = prefix;
+
+ if (nlmsg_append(nlmsg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0)
+ goto buffer_too_small;
+
+ if (prefix > 0 && nla_put(nlmsg, RTA_DST, addrDataLen, addrData) < 0)
+ goto buffer_too_small;
+
+ if (nla_put(nlmsg, RTA_GATEWAY, addrDataLen, gatewayData) < 0)
+ goto buffer_too_small;
+
+ if (nla_put_u32(nlmsg, RTA_OIF, ifindex) < 0)
+ goto buffer_too_small;
+
+ if (metric > 0 && nla_put_u32(nlmsg, RTA_PRIORITY, metric) < 0)
+ goto buffer_too_small;
+
+ if (virNetlinkCommand(nlmsg, &resp, &recvbuflen, 0, 0,
+ NETLINK_ROUTE, 0) < 0)
+ goto cleanup;
+
+ if ((errCode = virNetlinkGetErrorCode(resp, recvbuflen)) < 0) {
+ virReportSystemError(errCode, _("Error adding route to %s"), ifname);
+ goto cleanup;
+ }
+
+ ret = 0;
+ cleanup:
+ nlmsg_free(nlmsg);
+ return ret;
+
+ buffer_too_small:
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("allocated netlink buffer is too small"));
+ goto cleanup;
+}
+
#else /* defined(__linux__) && defined(HAVE_LIBNL) */
int virNetDevSetIPAddress(const char *ifname,
@@ -976,21 +1065,6 @@ int virNetDevSetIPAddress(const char *ifname,
return ret;
}
-#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
-
-/**
- * virNetDevAddRoute:
- * @ifname: the interface name
- * @addr: the IP network address (IPv4 or IPv6)
- * @prefix: number of 1 bits in the netmask
- * @gateway: via address for route (same as @addr)
- *
- * Add a route for a network IP address to an interface. This function
- * *does not* remove any previously added IP static routes.
- *
- * Returns 0 in case of success or -1 in case of error.
- */
-
int
virNetDevAddRoute(const char *ifname,
virSocketAddrPtr addr,
@@ -1023,6 +1097,7 @@ virNetDevAddRoute(const char *ifname,
virCommandFree(cmd);
return ret;
}
+#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
/**
* virNetDevClearIPv4Address:
--
1.8.4.5