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authorDavid Ahern <dsahern@gmail.com>2017-05-27 16:19:27 -0600
committerDavid S. Miller <davem@davemloft.net>2017-05-30 11:55:31 -0400
commitc255bd681d1a93fff2a2c249d91449cce830ac64 (patch)
tree926aa52879b0b1c3f348e37e599375c0e7a06641
parent78055998954b7a3e6c31eb24d1d26f0b63a7ec0d (diff)
downloadlinux-c255bd681d1a93fff2a2c249d91449cce830ac64.tar.bz2
net: lwtunnel: Add extack to encap attr validation
Pass extack down to lwtunnel_valid_encap_type and lwtunnel_valid_encap_type_attr. Add messages for unknown or unsupported encap types. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/lwtunnel.h13
-rw-r--r--net/core/lwtunnel.c18
-rw-r--r--net/ipv4/fib_frontend.c6
-rw-r--r--net/ipv6/route.c4
4 files changed, 28 insertions, 13 deletions
diff --git a/include/net/lwtunnel.h b/include/net/lwtunnel.h
index ebfe237aad7e..ca6f002774ef 100644
--- a/include/net/lwtunnel.h
+++ b/include/net/lwtunnel.h
@@ -107,8 +107,10 @@ int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
unsigned int num);
int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
unsigned int num);
-int lwtunnel_valid_encap_type(u16 encap_type);
-int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len);
+int lwtunnel_valid_encap_type(u16 encap_type,
+ struct netlink_ext_ack *extack);
+int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
+ struct netlink_ext_ack *extack);
int lwtunnel_build_state(u16 encap_type,
struct nlattr *encap,
unsigned int family, const void *cfg,
@@ -172,11 +174,14 @@ static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
return -EOPNOTSUPP;
}
-static inline int lwtunnel_valid_encap_type(u16 encap_type)
+static inline int lwtunnel_valid_encap_type(u16 encap_type,
+ struct netlink_ext_ack *extack)
{
+ NL_SET_ERR_MSG(extack, "CONFIG_LWTUNNEL is not enabled in this kernel");
return -EOPNOTSUPP;
}
-static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len)
+static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,
+ struct netlink_ext_ack *extack)
{
/* return 0 since we are not walking attr looking for
* RTA_ENCAP_TYPE attribute on nexthops.
diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c
index cfae3d5fe11f..ab840386a74d 100644
--- a/net/core/lwtunnel.c
+++ b/net/core/lwtunnel.c
@@ -126,14 +126,16 @@ int lwtunnel_build_state(u16 encap_type,
}
EXPORT_SYMBOL(lwtunnel_build_state);
-int lwtunnel_valid_encap_type(u16 encap_type)
+int lwtunnel_valid_encap_type(u16 encap_type, struct netlink_ext_ack *extack)
{
const struct lwtunnel_encap_ops *ops;
int ret = -EINVAL;
if (encap_type == LWTUNNEL_ENCAP_NONE ||
- encap_type > LWTUNNEL_ENCAP_MAX)
+ encap_type > LWTUNNEL_ENCAP_MAX) {
+ NL_SET_ERR_MSG(extack, "Unknown lwt encapsulation type");
return ret;
+ }
rcu_read_lock();
ops = rcu_dereference(lwtun_encaps[encap_type]);
@@ -153,11 +155,16 @@ int lwtunnel_valid_encap_type(u16 encap_type)
}
}
#endif
- return ops ? 0 : -EOPNOTSUPP;
+ ret = ops ? 0 : -EOPNOTSUPP;
+ if (ret < 0)
+ NL_SET_ERR_MSG(extack, "lwt encapsulation type not supported");
+
+ return ret;
}
EXPORT_SYMBOL(lwtunnel_valid_encap_type);
-int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int remaining)
+int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int remaining,
+ struct netlink_ext_ack *extack)
{
struct rtnexthop *rtnh = (struct rtnexthop *)attr;
struct nlattr *nla_entype;
@@ -174,7 +181,8 @@ int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int remaining)
if (nla_entype) {
encap_type = nla_get_u16(nla_entype);
- if (lwtunnel_valid_encap_type(encap_type) != 0)
+ if (lwtunnel_valid_encap_type(encap_type,
+ extack) != 0)
return -EOPNOTSUPP;
}
}
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 715b7967d8ea..4e678fa892dd 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -685,7 +685,8 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
break;
case RTA_MULTIPATH:
err = lwtunnel_valid_encap_type_attr(nla_data(attr),
- nla_len(attr));
+ nla_len(attr),
+ extack);
if (err < 0)
goto errout;
cfg->fc_mp = nla_data(attr);
@@ -702,7 +703,8 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
break;
case RTA_ENCAP_TYPE:
cfg->fc_encap_type = nla_get_u16(attr);
- err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
+ err = lwtunnel_valid_encap_type(cfg->fc_encap_type,
+ extack);
if (err < 0)
goto errout;
break;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 2fe84bdc4e60..524a76b5206e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3016,7 +3016,7 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
- cfg->fc_mp_len);
+ cfg->fc_mp_len, extack);
if (err < 0)
goto errout;
}
@@ -3035,7 +3035,7 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
if (tb[RTA_ENCAP_TYPE]) {
cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
- err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
+ err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
if (err < 0)
goto errout;
}