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virNetDevAddRoute: implementation using netlink

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This commit is contained in:
Cédric Bosdonnat 2014-08-06 16:46:24 +02:00
parent 2b0598c836
commit 9c9da6022c
1 changed files with 90 additions and 15 deletions
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105
src/util/virnetdev.c
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@ -963,6 +963,95 @@ 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,
@ -1013,21 +1102,6 @@ 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,
@ -1060,6 +1134,7 @@ virNetDevAddRoute(const char *ifname,
virCommandFree(cmd);
return ret;
}
#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
/**
* virNetDevClearIPv4Address: