forked from Minki/linux
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@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
David S. Miller
parent
b7b386f42f
commit
074350e2eb
@ -720,7 +720,8 @@ errout:
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static int mpls_nh_build(struct net *net, struct mpls_route *rt,
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struct mpls_nh *nh, int oif, struct nlattr *via,
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struct nlattr *newdst, u8 max_labels)
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struct nlattr *newdst, u8 max_labels,
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struct netlink_ext_ack *extack)
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{
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int err = -ENOMEM;
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@ -729,14 +730,14 @@ static int mpls_nh_build(struct net *net, struct mpls_route *rt,
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if (newdst) {
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err = nla_get_labels(newdst, max_labels, &nh->nh_labels,
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nh->nh_label, NULL);
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nh->nh_label, extack);
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if (err)
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goto errout;
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}
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if (via) {
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err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table,
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__mpls_nh_via(rt, nh));
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__mpls_nh_via(rt, nh), extack);
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if (err)
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goto errout;
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} else {
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@ -803,7 +804,8 @@ static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
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}
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static int mpls_nh_build_multi(struct mpls_route_config *cfg,
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struct mpls_route *rt, u8 max_labels)
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struct mpls_route *rt, u8 max_labels,
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struct netlink_ext_ack *extack)
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{
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struct rtnexthop *rtnh = cfg->rc_mp;
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struct nlattr *nla_via, *nla_newdst;
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@ -837,7 +839,7 @@ static int mpls_nh_build_multi(struct mpls_route_config *cfg,
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err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
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rtnh->rtnh_ifindex, nla_via, nla_newdst,
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max_labels);
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max_labels, extack);
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if (err)
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goto errout;
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@ -856,20 +858,28 @@ errout:
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return err;
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}
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static bool mpls_label_ok(struct net *net, unsigned int index)
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static bool mpls_label_ok(struct net *net, unsigned int index,
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struct netlink_ext_ack *extack)
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{
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/* Reserved labels may not be set */
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if (index < MPLS_LABEL_FIRST_UNRESERVED)
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if (index < MPLS_LABEL_FIRST_UNRESERVED) {
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NL_SET_ERR_MSG(extack,
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"Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher");
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return false;
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}
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/* The full 20 bit range may not be supported. */
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if (index >= net->mpls.platform_labels)
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if (index >= net->mpls.platform_labels) {
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NL_SET_ERR_MSG(extack,
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"Label >= configured maximum in platform_labels");
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return false;
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}
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return true;
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}
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static int mpls_route_add(struct mpls_route_config *cfg)
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static int mpls_route_add(struct mpls_route_config *cfg,
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struct netlink_ext_ack *extack)
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{
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struct mpls_route __rcu **platform_label;
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struct net *net = cfg->rc_nlinfo.nl_net;
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@ -888,13 +898,15 @@ static int mpls_route_add(struct mpls_route_config *cfg)
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index = find_free_label(net);
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}
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if (!mpls_label_ok(net, index))
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if (!mpls_label_ok(net, index, extack))
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goto errout;
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/* Append makes no sense with mpls */
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err = -EOPNOTSUPP;
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if (cfg->rc_nlflags & NLM_F_APPEND)
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if (cfg->rc_nlflags & NLM_F_APPEND) {
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NL_SET_ERR_MSG(extack, "MPLS does not support route append");
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goto errout;
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}
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err = -EEXIST;
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platform_label = rtnl_dereference(net->mpls.platform_label);
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@ -921,8 +933,10 @@ static int mpls_route_add(struct mpls_route_config *cfg)
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nhs = 1;
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}
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if (nhs == 0)
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if (nhs == 0) {
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NL_SET_ERR_MSG(extack, "Route does not contain a nexthop");
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goto errout;
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}
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err = -ENOMEM;
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rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
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@ -936,7 +950,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
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rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
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if (cfg->rc_mp)
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err = mpls_nh_build_multi(cfg, rt, max_labels);
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err = mpls_nh_build_multi(cfg, rt, max_labels, extack);
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else
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err = mpls_nh_build_from_cfg(cfg, rt);
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if (err)
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@ -952,7 +966,8 @@ errout:
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return err;
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}
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static int mpls_route_del(struct mpls_route_config *cfg)
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static int mpls_route_del(struct mpls_route_config *cfg,
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struct netlink_ext_ack *extack)
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{
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struct net *net = cfg->rc_nlinfo.nl_net;
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unsigned index;
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@ -960,7 +975,7 @@ static int mpls_route_del(struct mpls_route_config *cfg)
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index = cfg->rc_label;
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if (!mpls_label_ok(net, index))
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if (!mpls_label_ok(net, index, extack))
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goto errout;
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mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
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@ -1626,19 +1641,25 @@ out:
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}
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EXPORT_SYMBOL_GPL(nla_get_labels);
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int nla_get_via(const struct nlattr *nla, u8 *via_alen,
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u8 *via_table, u8 via_addr[])
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int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
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u8 via_addr[], struct netlink_ext_ack *extack)
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{
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struct rtvia *via = nla_data(nla);
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int err = -EINVAL;
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int alen;
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if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr))
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if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) {
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NL_SET_ERR_MSG_ATTR(extack, nla,
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"Invalid attribute length for RTA_VIA");
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goto errout;
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}
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alen = nla_len(nla) -
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offsetof(struct rtvia, rtvia_addr);
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if (alen > MAX_VIA_ALEN)
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if (alen > MAX_VIA_ALEN) {
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NL_SET_ERR_MSG_ATTR(extack, nla,
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"Invalid address length for RTA_VIA");
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goto errout;
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}
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/* Validate the address family */
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switch (via->rtvia_family) {
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@ -1668,8 +1689,10 @@ errout:
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return err;
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}
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static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct mpls_route_config *cfg)
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static int rtm_to_route_config(struct sk_buff *skb,
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struct nlmsghdr *nlh,
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struct mpls_route_config *cfg,
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struct netlink_ext_ack *extack)
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{
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struct rtmsg *rtm;
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struct nlattr *tb[RTA_MAX+1];
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@ -1677,35 +1700,54 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
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int err;
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err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy,
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NULL);
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extack);
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if (err < 0)
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goto errout;
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err = -EINVAL;
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rtm = nlmsg_data(nlh);
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if (rtm->rtm_family != AF_MPLS)
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if (rtm->rtm_family != AF_MPLS) {
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NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg");
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goto errout;
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if (rtm->rtm_dst_len != 20)
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}
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if (rtm->rtm_dst_len != 20) {
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NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS");
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goto errout;
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if (rtm->rtm_src_len != 0)
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}
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if (rtm->rtm_src_len != 0) {
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NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS");
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goto errout;
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if (rtm->rtm_tos != 0)
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}
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if (rtm->rtm_tos != 0) {
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NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS");
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goto errout;
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if (rtm->rtm_table != RT_TABLE_MAIN)
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}
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if (rtm->rtm_table != RT_TABLE_MAIN) {
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NL_SET_ERR_MSG(extack,
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"MPLS only supports the main route table");
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goto errout;
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}
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/* Any value is acceptable for rtm_protocol */
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/* As mpls uses destination specific addresses
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* (or source specific address in the case of multicast)
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* all addresses have universal scope.
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*/
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if (rtm->rtm_scope != RT_SCOPE_UNIVERSE)
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if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) {
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NL_SET_ERR_MSG(extack,
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"Invalid route scope - MPLS only supports UNIVERSE");
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goto errout;
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if (rtm->rtm_type != RTN_UNICAST)
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}
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if (rtm->rtm_type != RTN_UNICAST) {
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NL_SET_ERR_MSG(extack,
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"Invalid route type - MPLS only supports UNICAST");
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goto errout;
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if (rtm->rtm_flags != 0)
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}
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if (rtm->rtm_flags != 0) {
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NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS");
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goto errout;
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}
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cfg->rc_label = LABEL_NOT_SPECIFIED;
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cfg->rc_protocol = rtm->rtm_protocol;
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@ -1728,25 +1770,26 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
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case RTA_NEWDST:
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if (nla_get_labels(nla, MAX_NEW_LABELS,
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&cfg->rc_output_labels,
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cfg->rc_output_label, NULL))
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cfg->rc_output_label, extack))
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goto errout;
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break;
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case RTA_DST:
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{
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u8 label_count;
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if (nla_get_labels(nla, 1, &label_count,
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&cfg->rc_label, NULL))
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&cfg->rc_label, extack))
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goto errout;
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if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
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cfg->rc_label))
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cfg->rc_label, extack))
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goto errout;
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break;
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}
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case RTA_VIA:
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{
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if (nla_get_via(nla, &cfg->rc_via_alen,
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&cfg->rc_via_table, cfg->rc_via))
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&cfg->rc_via_table, cfg->rc_via,
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extack))
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goto errout;
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break;
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}
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@ -1760,14 +1803,18 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
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{
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u8 ttl_propagate = nla_get_u8(nla);
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if (ttl_propagate > 1)
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if (ttl_propagate > 1) {
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NL_SET_ERR_MSG_ATTR(extack, nla,
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"RTA_TTL_PROPAGATE can only be 0 or 1");
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goto errout;
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}
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cfg->rc_ttl_propagate = ttl_propagate ?
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MPLS_TTL_PROP_ENABLED :
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MPLS_TTL_PROP_DISABLED;
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break;
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}
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default:
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NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute");
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/* Unsupported attribute */
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goto errout;
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}
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@ -1788,11 +1835,11 @@ static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
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if (!cfg)
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return -ENOMEM;
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err = rtm_to_route_config(skb, nlh, cfg);
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err = rtm_to_route_config(skb, nlh, cfg, extack);
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if (err < 0)
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goto out;
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err = mpls_route_del(cfg);
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err = mpls_route_del(cfg, extack);
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out:
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kfree(cfg);
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@ -1810,11 +1857,11 @@ static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
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if (!cfg)
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return -ENOMEM;
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err = rtm_to_route_config(skb, nlh, cfg);
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err = rtm_to_route_config(skb, nlh, cfg, extack);
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if (err < 0)
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goto out;
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err = mpls_route_add(cfg);
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err = mpls_route_add(cfg, extack);
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out:
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kfree(cfg);
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@ -205,7 +205,7 @@ int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
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int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
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u32 label[], struct netlink_ext_ack *extack);
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int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
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u8 via[]);
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u8 via[], struct netlink_ext_ack *extack);
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bool mpls_output_possible(const struct net_device *dev);
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unsigned int mpls_dev_mtu(const struct net_device *dev);
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bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu);
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