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Message-Id: <20170525035442.51407-6-dsahern@gmail.com>
Date: Wed, 24 May 2017 21:54:41 -0600
From: David Ahern <dsahern@...il.com>
To: netdev@...r.kernel.org
Cc: roopa@...ulusnetworks.com, David Ahern <dsahern@...il.com>
Subject: [PATCH net-next 5/6] net: mpls: Add extack messages for route add and delete failures
Add error messages for failures in adding and deleting mpls routes.
This covers most of the annoying EINVAL errors.
Signed-off-by: David Ahern <dsahern@...il.com>
---
net/mpls/af_mpls.c | 136 +++++++++++++++++++++++++++++++++++++---------------
net/mpls/internal.h | 2 +-
2 files changed, 98 insertions(+), 40 deletions(-)
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index f3830951fb1c..d0120f8c8a2c 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -720,7 +720,8 @@ static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
static int mpls_nh_build(struct net *net, struct mpls_route *rt,
struct mpls_nh *nh, int oif, struct nlattr *via,
- struct nlattr *newdst, u8 max_labels)
+ struct nlattr *newdst, u8 max_labels,
+ struct netlink_ext_ack *extack)
{
int err = -ENOMEM;
@@ -729,14 +730,14 @@ static int mpls_nh_build(struct net *net, struct mpls_route *rt,
if (newdst) {
err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
- nh->nh_label, NULL);
+ nh->nh_label, extack);
if (err)
goto errout;
}
if (via) {
err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
- __mpls_nh_via(rt, nh));
+ __mpls_nh_via(rt, nh), extack);
if (err)
goto errout;
} else {
@@ -803,7 +804,8 @@ static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
}
static int mpls_nh_build_multi(struct mpls_route_config *cfg,
- struct mpls_route *rt, u8 max_labels)
+ struct mpls_route *rt, u8 max_labels,
+ struct netlink_ext_ack *extack)
{
struct rtnexthop *rtnh = cfg->rc_mp;
struct nlattr *nla_via, *nla_newdst;
@@ -837,7 +839,7 @@ static int mpls_nh_build_multi(struct mpls_route_config *cfg,
err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
rtnh->rtnh_ifindex, nla_via, nla_newdst,
- max_labels);
+ max_labels, extack);
if (err)
goto errout;
@@ -856,7 +858,8 @@ static int mpls_nh_build_multi(struct mpls_route_config *cfg,
return err;
}
-static int mpls_route_add(struct mpls_route_config *cfg)
+static int mpls_route_add(struct mpls_route_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct mpls_route __rcu **platform_label;
struct net *net = cfg->rc_nlinfo.nl_net;
@@ -876,17 +879,25 @@ static int mpls_route_add(struct mpls_route_config *cfg)
}
/* Reserved labels may not be set */
- if (index < MPLS_LABEL_FIRST_UNRESERVED)
+ if (index < MPLS_LABEL_FIRST_UNRESERVED) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
goto errout;
+ }
/* The full 20 bit range may not be supported. */
- if (index >= net->mpls.platform_labels)
+ if (index >= net->mpls.platform_labels) {
+ NL_SET_ERR_MSG(extack,
+ "Label >= configured max in platform_labels");
goto errout;
+ }
/* Append makes no sense with mpls */
err = -EOPNOTSUPP;
- if (cfg->rc_nlflags & NLM_F_APPEND)
+ if (cfg->rc_nlflags & NLM_F_APPEND) {
+ NL_SET_ERR_MSG(extack, "MPLS does not support route append");
goto errout;
+ }
err = -EEXIST;
platform_label = rtnl_dereference(net->mpls.platform_label);
@@ -913,8 +924,10 @@ static int mpls_route_add(struct mpls_route_config *cfg)
nhs = 1;
}
- if (nhs == 0)
+ if (nhs == 0) {
+ NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
goto errout;
+ }
err = -ENOMEM;
rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
@@ -928,7 +941,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
if (cfg->rc_mp)
- err = mpls_nh_build_multi(cfg, rt, max_labels);
+ err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
else
err = mpls_nh_build_from_cfg(cfg, rt);
if (err)
@@ -944,7 +957,8 @@ static int mpls_route_add(struct mpls_route_config *cfg)
return err;
}
-static int mpls_route_del(struct mpls_route_config *cfg)
+static int mpls_route_del(struct mpls_route_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct net *net = cfg->rc_nlinfo.nl_net;
unsigned index;
@@ -953,12 +967,18 @@ static int mpls_route_del(struct mpls_route_config *cfg)
index = cfg->rc_label;
/* Reserved labels may not be removed */
- if (index < MPLS_LABEL_FIRST_UNRESERVED)
+ if (index < MPLS_LABEL_FIRST_UNRESERVED) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
goto errout;
+ }
/* The full 20 bit range may not be supported */
- if (index >= net->mpls.platform_labels)
+ if (index >= net->mpls.platform_labels) {
+ NL_SET_ERR_MSG(extack,
+ "Label >= configured max in platform_labels");
goto errout;
+ }
mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
@@ -1623,19 +1643,25 @@ int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
}
EXPORT_SYMBOL_GPL(nla_get_labels);
-int nla_get_via(const struct nlattr *nla, u8 *via_alen,
- u8 *via_table, u8 via_addr[])
+int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
+ u8 via_addr[], struct netlink_ext_ack *extack)
{
struct rtvia *via = nla_data(nla);
int err = -EINVAL;
int alen;
- if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr))
+ if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Invalid attribute length for RTA_VIA");
goto errout;
+ }
alen = nla_len(nla) -
offsetof(struct rtvia, rtvia_addr);
- if (alen > MAX_VIA_ALEN)
+ if (alen > MAX_VIA_ALEN) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Invalid address length for RTA_VIA");
goto errout;
+ }
/* Validate the address family */
switch (via->rtvia_family) {
@@ -1665,8 +1691,10 @@ int nla_get_via(const struct nlattr *nla, u8 *via_alen,
return err;
}
-static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
- struct mpls_route_config *cfg)
+static int rtm_to_route_config(struct sk_buff *skb,
+ struct nlmsghdr *nlh,
+ struct mpls_route_config *cfg,
+ struct netlink_ext_ack *extack)
{
struct rtmsg *rtm;
struct nlattr *tb[RTA_MAX+1];
@@ -1674,35 +1702,54 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
int err;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy,
- NULL);
+ extack);
if (err < 0)
goto errout;
err = -EINVAL;
rtm = nlmsg_data(nlh);
- if (rtm->rtm_family != AF_MPLS)
+ if (rtm->rtm_family != AF_MPLS) {
+ NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
goto errout;
- if (rtm->rtm_dst_len != 20)
+ }
+ if (rtm->rtm_dst_len != 20) {
+ NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
goto errout;
- if (rtm->rtm_src_len != 0)
+ }
+ if (rtm->rtm_src_len != 0) {
+ NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
goto errout;
- if (rtm->rtm_tos != 0)
+ }
+ if (rtm->rtm_tos != 0) {
+ NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
goto errout;
- if (rtm->rtm_table != RT_TABLE_MAIN)
+ }
+ if (rtm->rtm_table != RT_TABLE_MAIN) {
+ NL_SET_ERR_MSG(extack,
+ "MPLS only supports the main route table");
goto errout;
+ }
/* Any value is acceptable for rtm_protocol */
/* As mpls uses destination specific addresses
* (or source specific address in the case of multicast)
* all addresses have universal scope.
*/
- if (rtm->rtm_scope != RT_SCOPE_UNIVERSE)
+ if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid route scope - MPLS only supports UNIVERSE");
goto errout;
- if (rtm->rtm_type != RTN_UNICAST)
+ }
+ if (rtm->rtm_type != RTN_UNICAST) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid route type - MPLS only supports UNICAST");
goto errout;
- if (rtm->rtm_flags != 0)
+ }
+ if (rtm->rtm_flags != 0) {
+ NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
goto errout;
+ }
cfg->rc_label = LABEL_NOT_SPECIFIED;
cfg->rc_protocol = rtm->rtm_protocol;
@@ -1725,26 +1772,33 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
case RTA_NEWDST:
if (nla_get_labels(nla, MAX_NEW_LABELS,
&cfg->rc_output_labels,
- cfg->rc_output_label, NULL))
+ cfg->rc_output_label, extack)) {
+ NL_SET_BAD_ATTR(extack, nla);
goto errout;
+ }
break;
case RTA_DST:
{
u8 label_count;
if (nla_get_labels(nla, 1, &label_count,
- &cfg->rc_label, NULL))
+ &cfg->rc_label, extack)) {
+ NL_SET_BAD_ATTR(extack, nla);
goto errout;
+ }
/* Reserved labels may not be set */
- if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED)
+ if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "Invalid label for RTA_DST");
goto errout;
-
+ }
break;
}
case RTA_VIA:
{
if (nla_get_via(nla, &cfg->rc_via_alen,
- &cfg->rc_via_table, cfg->rc_via))
+ &cfg->rc_via_table, cfg->rc_via,
+ extack))
goto errout;
break;
}
@@ -1758,14 +1812,18 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
{
u8 ttl_propagate = nla_get_u8(nla);
- if (ttl_propagate > 1)
+ if (ttl_propagate > 1) {
+ NL_SET_ERR_MSG_ATTR(extack, nla,
+ "RTA_TTL_PROPAGATE can only be 0 or 1");
goto errout;
+ }
cfg->rc_ttl_propagate = ttl_propagate ?
MPLS_TTL_PROP_ENABLED :
MPLS_TTL_PROP_DISABLED;
break;
}
default:
+ NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
/* Unsupported attribute */
goto errout;
}
@@ -1786,11 +1844,11 @@ static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
if (!cfg)
return -ENOMEM;
- err = rtm_to_route_config(skb, nlh, cfg);
+ err = rtm_to_route_config(skb, nlh, cfg, extack);
if (err < 0)
goto out;
- err = mpls_route_del(cfg);
+ err = mpls_route_del(cfg, extack);
out:
kfree(cfg);
@@ -1808,11 +1866,11 @@ static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
if (!cfg)
return -ENOMEM;
- err = rtm_to_route_config(skb, nlh, cfg);
+ err = rtm_to_route_config(skb, nlh, cfg, extack);
if (err < 0)
goto out;
- err = mpls_route_add(cfg);
+ err = mpls_route_add(cfg, extack);
out:
kfree(cfg);
diff --git a/net/mpls/internal.h b/net/mpls/internal.h
index e59f299ceb3f..a015a6a1143b 100644
--- a/net/mpls/internal.h
+++ b/net/mpls/internal.h
@@ -205,7 +205,7 @@ int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
u32 label[], struct netlink_ext_ack *extack);
int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
- u8 via[]);
+ u8 via[], struct netlink_ext_ack *extack);
bool mpls_output_possible(const struct net_device *dev);
unsigned int mpls_dev_mtu(const struct net_device *dev);
bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
--
2.11.0 (Apple Git-81)
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