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authorGirish Moodalbail <girish.moodalbail@oracle.com>2017-08-09 01:09:28 -0700
committerDavid S. Miller <davem@davemloft.net>2017-08-11 13:45:02 -0700
commitc5ebc4409f2bb2c0b053c204ba197c6b71527eed (patch)
tree1dc3df096515f9e0c369af693e19fcab3a04002e /drivers/net/geneve.c
parentMerge branch 'sctp-remove-typedefs-from-structures-part-6' (diff)
downloadlinux-dev-c5ebc4409f2bb2c0b053c204ba197c6b71527eed.tar.xz
linux-dev-c5ebc4409f2bb2c0b053c204ba197c6b71527eed.zip
geneve: use netlink_ext_ack for error reporting in rtnl operations
Add extack error messages for failure paths while creating/modifying geneve devices. Once extack support is added to iproute2, more meaningful and helpful error messages will be displayed making it easy for users to discern what went wrong. Before: ======= $ ip link add gen1 address 0:1:2:3:4:5:6 type geneve id 200 \ remote 192.168.13.2 RTNETLINK answers: Invalid argument After: ====== $ ip link add gen1 address 0:1:2:3:4:5:6 type geneve id 200 \ remote 192.168.13.2 Error: Provided link layer address is not Ethernet Also, netdev_dbg() calls used to log errors associated with Netlink request have been removed. Signed-off-by: Girish Moodalbail <girish.moodalbail@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/geneve.c')
-rw-r--r--drivers/net/geneve.c128
1 files changed, 92 insertions, 36 deletions
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 8b8565dd2afb..f6404074b7b0 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1086,21 +1086,33 @@ static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
if (tb[IFLA_ADDRESS]) {
- if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+ "Provided link layer address is not Ethernet");
return -EINVAL;
+ }
- if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
+ "Provided Ethernet address is not unicast");
return -EADDRNOTAVAIL;
+ }
}
- if (!data)
+ if (!data) {
+ NL_SET_ERR_MSG(extack,
+ "Not enough attributes provided to perform the operation");
return -EINVAL;
+ }
if (data[IFLA_GENEVE_ID]) {
__u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
- if (vni >= GENEVE_N_VID)
+ if (vni >= GENEVE_N_VID) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
+ "Geneve ID must be lower than 16777216");
return -ERANGE;
+ }
}
return 0;
@@ -1158,6 +1170,7 @@ static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
}
static int geneve_configure(struct net *net, struct net_device *dev,
+ struct netlink_ext_ack *extack,
const struct ip_tunnel_info *info,
bool metadata, bool ipv6_rx_csum)
{
@@ -1166,8 +1179,11 @@ static int geneve_configure(struct net *net, struct net_device *dev,
bool tun_collect_md, tun_on_same_port;
int err, encap_len;
- if (metadata && !is_tnl_info_zero(info))
+ if (metadata && !is_tnl_info_zero(info)) {
+ NL_SET_ERR_MSG(extack,
+ "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
return -EINVAL;
+ }
geneve->net = net;
geneve->dev = dev;
@@ -1188,11 +1204,17 @@ static int geneve_configure(struct net *net, struct net_device *dev,
dev->needed_headroom = encap_len + ETH_HLEN;
if (metadata) {
- if (tun_on_same_port)
+ if (tun_on_same_port) {
+ NL_SET_ERR_MSG(extack,
+ "There can be only one externally controlled device on a destination port");
return -EPERM;
+ }
} else {
- if (tun_collect_md)
+ if (tun_collect_md) {
+ NL_SET_ERR_MSG(extack,
+ "There already exists an externally controlled device on this destination port");
return -EPERM;
+ }
}
dst_cache_reset(&geneve->info.dst_cache);
@@ -1214,31 +1236,41 @@ static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
info->key.tp_dst = htons(dst_port);
}
-static int geneve_nl2info(struct net_device *dev, struct nlattr *tb[],
- struct nlattr *data[], struct ip_tunnel_info *info,
- bool *metadata, bool *use_udp6_rx_checksums,
- bool changelink)
+static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack,
+ struct ip_tunnel_info *info, bool *metadata,
+ bool *use_udp6_rx_checksums, bool changelink)
{
- if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
+ int attrtype;
+
+ if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
+ NL_SET_ERR_MSG(extack,
+ "Cannot specify both IPv4 and IPv6 Remote addresses");
return -EINVAL;
+ }
if (data[IFLA_GENEVE_REMOTE]) {
- if (changelink && (ip_tunnel_info_af(info) == AF_INET6))
- return -EOPNOTSUPP;
+ if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
+ attrtype = IFLA_GENEVE_REMOTE;
+ goto change_notsup;
+ }
info->key.u.ipv4.dst =
nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
- netdev_dbg(dev, "multicast remote is unsupported\n");
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
+ "Remote IPv4 address cannot be Multicast");
return -EINVAL;
}
}
if (data[IFLA_GENEVE_REMOTE6]) {
#if IS_ENABLED(CONFIG_IPV6)
- if (changelink && (ip_tunnel_info_af(info) == AF_INET))
- return -EOPNOTSUPP;
+ if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
+ attrtype = IFLA_GENEVE_REMOTE6;
+ goto change_notsup;
+ }
info->mode = IP_TUNNEL_INFO_IPV6;
info->key.u.ipv6.dst =
@@ -1246,16 +1278,20 @@ static int geneve_nl2info(struct net_device *dev, struct nlattr *tb[],
if (ipv6_addr_type(&info->key.u.ipv6.dst) &
IPV6_ADDR_LINKLOCAL) {
- netdev_dbg(dev, "link-local remote is unsupported\n");
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
+ "Remote IPv6 address cannot be link-local");
return -EINVAL;
}
if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
- netdev_dbg(dev, "multicast remote is unsupported\n");
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
+ "Remote IPv6 address cannot be Multicast");
return -EINVAL;
}
info->key.tun_flags |= TUNNEL_CSUM;
*use_udp6_rx_checksums = true;
#else
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
+ "IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
#endif
}
@@ -1271,8 +1307,10 @@ static int geneve_nl2info(struct net_device *dev, struct nlattr *tb[],
tvni[2] = vni & 0x000000ff;
tunid = vni_to_tunnel_id(tvni);
- if (changelink && (tunid != info->key.tun_id))
- return -EOPNOTSUPP;
+ if (changelink && (tunid != info->key.tun_id)) {
+ attrtype = IFLA_GENEVE_ID;
+ goto change_notsup;
+ }
info->key.tun_id = tunid;
}
@@ -1285,44 +1323,61 @@ static int geneve_nl2info(struct net_device *dev, struct nlattr *tb[],
if (data[IFLA_GENEVE_LABEL]) {
info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
IPV6_FLOWLABEL_MASK;
- if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6)))
+ if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
+ NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
+ "Label attribute only applies for IPv6 Geneve devices");
return -EINVAL;
+ }
}
if (data[IFLA_GENEVE_PORT]) {
- if (changelink)
- return -EOPNOTSUPP;
+ if (changelink) {
+ attrtype = IFLA_GENEVE_PORT;
+ goto change_notsup;
+ }
info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
}
if (data[IFLA_GENEVE_COLLECT_METADATA]) {
- if (changelink)
- return -EOPNOTSUPP;
+ if (changelink) {
+ attrtype = IFLA_GENEVE_COLLECT_METADATA;
+ goto change_notsup;
+ }
*metadata = true;
}
if (data[IFLA_GENEVE_UDP_CSUM]) {
- if (changelink)
- return -EOPNOTSUPP;
+ if (changelink) {
+ attrtype = IFLA_GENEVE_UDP_CSUM;
+ goto change_notsup;
+ }
if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
info->key.tun_flags |= TUNNEL_CSUM;
}
if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
- if (changelink)
- return -EOPNOTSUPP;
+ if (changelink) {
+ attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
+ goto change_notsup;
+ }
if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
info->key.tun_flags &= ~TUNNEL_CSUM;
}
if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
- if (changelink)
- return -EOPNOTSUPP;
+ if (changelink) {
+ attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
+ goto change_notsup;
+ }
if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
*use_udp6_rx_checksums = false;
}
return 0;
+change_notsup:
+ NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
+ "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
+ return -EOPNOTSUPP;
}
static int geneve_newlink(struct net *net, struct net_device *dev,
@@ -1335,12 +1390,13 @@ static int geneve_newlink(struct net *net, struct net_device *dev,
int err;
init_tnl_info(&info, GENEVE_UDP_PORT);
- err = geneve_nl2info(dev, tb, data, &info, &metadata,
+ err = geneve_nl2info(tb, data, extack, &info, &metadata,
&use_udp6_rx_checksums, false);
if (err)
return err;
- return geneve_configure(net, dev, &info, metadata, use_udp6_rx_checksums);
+ return geneve_configure(net, dev, extack, &info, metadata,
+ use_udp6_rx_checksums);
}
/* Quiesces the geneve device data path for both TX and RX.
@@ -1409,7 +1465,7 @@ static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
memcpy(&info, &geneve->info, sizeof(info));
metadata = geneve->collect_md;
use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
- err = geneve_nl2info(dev, tb, data, &info, &metadata,
+ err = geneve_nl2info(tb, data, extack, &info, &metadata,
&use_udp6_rx_checksums, true);
if (err)
return err;
@@ -1536,7 +1592,7 @@ struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
return dev;
init_tnl_info(&info, dst_port);
- err = geneve_configure(net, dev, &info, true, true);
+ err = geneve_configure(net, dev, NULL, &info, true, true);
if (err) {
free_netdev(dev);
return ERR_PTR(err);