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mpls: route get support 

This patch adds RTM_GETROUTE doit handler for mpls routes.

Input:
RTA_DST - input label
RTA_NEWDST - labels in packet for multipath selection

By default the getroute handler returns matched
nexthop label, via and oif

With RTM_F_FIB_MATCH flag, full matched route is
returned.

example (with patched iproute2):
$ip -f mpls route show
101
        nexthop as to 102/103 via inet 172.16.2.2 dev virt1-2
        nexthop as to 302/303 via inet 172.16.12.2 dev virt1-12
201
        nexthop as to 202/203 via inet6 2001:db8:2::2 dev virt1-2
        nexthop as to 402/403 via inet6 2001:db8:12::2 dev virt1-12

$ip -f mpls route get 103
RTNETLINK answers: Network is unreachable

$ip -f mpls route get 101
101 as to 102/103 via inet 172.16.2.2 dev virt1-2

$ip -f mpls route get as to 302/303 101
101 as to 302/303 via inet 172.16.12.2 dev virt1-12

$ip -f mpls route get fibmatch 103
RTNETLINK answers: Network is unreachable

$ip -f mpls route get fibmatch 101
101
        nexthop as to 102/103 via inet 172.16.2.2 dev virt1-2
        nexthop as to 302/303 via inet 172.16.12.2 dev virt1-12

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2017-07-03 15:31:21 -07:00 committed by David S. Miller
parent 7597b266c5
commit 397fc9e5ce
1 changed files with 162 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

163
net/mpls/af_mpls.c
View File

@ -2071,6 +2071,166 @@ static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err);
}
static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(in_skb->sk);
u32 portid = NETLINK_CB(in_skb).portid;
struct nlattr *tb[RTA_MAX + 1];
u32 labels[MAX_NEW_LABELS];
struct mpls_shim_hdr *hdr;
unsigned int hdr_size = 0;
struct net_device *dev;
struct mpls_route *rt;
struct rtmsg *rtm, *r;
struct nlmsghdr *nlh;
struct sk_buff *skb;
struct mpls_nh *nh;
int err = -EINVAL;
u32 in_label;
u8 n_labels;
err = nlmsg_parse(in_nlh, sizeof(*rtm), tb, RTA_MAX,
rtm_ipv4_policy, extack);
if (err < 0)
goto errout;
rtm = nlmsg_data(in_nlh);
if (tb[RTA_DST]) {
u8 label_count;
if (nla_get_labels(tb[RTA_DST], 1, &label_count,
&in_label, extack))
goto errout;
if (in_label < MPLS_LABEL_FIRST_UNRESERVED)
goto errout;
}
rt = mpls_route_input_rcu(net, in_label);
if (!rt) {
err = -ENETUNREACH;
goto errout;
}
if (rtm->rtm_flags & RTM_F_FIB_MATCH) {
skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL);
if (!skb) {
err = -ENOBUFS;
goto errout;
}
err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq,
RTM_NEWROUTE, in_label, rt, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in lfib_nlmsg_size */
WARN_ON(err == -EMSGSIZE);
goto errout_free;
}
return rtnl_unicast(skb, net, portid);
}
if (tb[RTA_NEWDST]) {
if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels,
labels, extack) != 0) {
err = -EINVAL;
goto errout;
}
hdr_size = n_labels * sizeof(struct mpls_shim_hdr);
}
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb) {
err = -ENOBUFS;
goto errout;
}
skb->protocol = htons(ETH_P_MPLS_UC);
if (hdr_size) {
bool bos;
int i;
if (skb_cow(skb, hdr_size)) {
err = -ENOBUFS;
goto errout_free;
}
skb_reserve(skb, hdr_size);
skb_push(skb, hdr_size);
skb_reset_network_header(skb);
/* Push new labels */
hdr = mpls_hdr(skb);
bos = true;
for (i = n_labels - 1; i >= 0; i--) {
hdr[i] = mpls_entry_encode(labels[i],
1, 0, bos);
bos = false;
}
}
nh = mpls_select_multipath(rt, skb);
if (!nh) {
err = -ENETUNREACH;
goto errout_free;
}
if (hdr_size) {
skb_pull(skb, hdr_size);
skb_reset_network_header(skb);
}
nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq,
RTM_NEWROUTE, sizeof(*r), 0);
if (!nlh) {
err = -EMSGSIZE;
goto errout_free;
}
r = nlmsg_data(nlh);
r->rtm_family = AF_MPLS;
r->rtm_dst_len = 20;
r->rtm_src_len = 0;
r->rtm_table = RT_TABLE_MAIN;
r->rtm_type = RTN_UNICAST;
r->rtm_scope = RT_SCOPE_UNIVERSE;
r->rtm_protocol = rt->rt_protocol;
r->rtm_flags = 0;
if (nla_put_labels(skb, RTA_DST, 1, &in_label))
goto nla_put_failure;
if (nh->nh_labels &&
nla_put_labels(skb, RTA_NEWDST, nh->nh_labels,
nh->nh_label))
goto nla_put_failure;
if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC &&
nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh),
nh->nh_via_alen))
goto nla_put_failure;
dev = rtnl_dereference(nh->nh_dev);
if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex))
goto nla_put_failure;
nlmsg_end(skb, nlh);
err = rtnl_unicast(skb, net, portid);
errout:
return err;
nla_put_failure:
nlmsg_cancel(skb, nlh);
err = -EMSGSIZE;
errout_free:
kfree_skb(skb);
return err;
}
static int resize_platform_label_table(struct net *net, size_t limit)
{
size_t size = sizeof(struct mpls_route *) * limit;
@ -2317,7 +2477,8 @@ static int __init mpls_init(void)
rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL);
rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL);
rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL);
rtnl_register(PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes,
NULL);
rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf,
mpls_netconf_dump_devconf, NULL);
err = 0;