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authorDavid Ahern <dsa@cumulusnetworks.com>2017-03-31 07:14:04 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-01 20:21:44 -0700
commit1511009cd68015c2e04135bfefa4bf5020baa8d9 (patch)
treeca1ca7c8f76a3bc752ccf31e3b216fa9119f71d7 /net
parenta4ac8c986d3f72ccbaf6d6782511fb645e568306 (diff)
downloadlinux-1511009cd68015c2e04135bfefa4bf5020baa8d9.tar.bz2
net: mpls: Increase max number of labels for lwt encap
Alow users to push down more labels per MPLS encap. Similar to LSR case, move label array to the end of mpls_iptunnel_encap and allocate based on the number of labels for the route. For consistency with the LSR case, re-use the same maximum number of labels. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/mpls/af_mpls.c5
-rw-r--r--net/mpls/internal.h5
-rw-r--r--net/mpls/mpls_iptunnel.c13
3 files changed, 15 insertions, 8 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 10daefd7f938..5928d22ba9c8 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -24,11 +24,6 @@
#include <net/nexthop.h>
#include "internal.h"
-/* put a reasonable limit on the number of labels
- * we will accept from userspace
- */
-#define MAX_NEW_LABELS 30
-
/* max memory we will use for mpls_route */
#define MAX_MPLS_ROUTE_MEM 4096
diff --git a/net/mpls/internal.h b/net/mpls/internal.h
index c5d2f5bc37ec..4db6a5971322 100644
--- a/net/mpls/internal.h
+++ b/net/mpls/internal.h
@@ -2,6 +2,11 @@
#define MPLS_INTERNAL_H
#include <net/mpls.h>
+/* put a reasonable limit on the number of labels
+ * we will accept from userspace
+ */
+#define MAX_NEW_LABELS 30
+
struct mpls_entry_decoded {
u32 label;
u8 ttl;
diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c
index 22f71fce0bfb..fe00e98667cf 100644
--- a/net/mpls/mpls_iptunnel.c
+++ b/net/mpls/mpls_iptunnel.c
@@ -164,6 +164,7 @@ static int mpls_build_state(struct nlattr *nla,
struct mpls_iptunnel_encap *tun_encap_info;
struct nlattr *tb[MPLS_IPTUNNEL_MAX + 1];
struct lwtunnel_state *newts;
+ u8 n_labels;
int ret;
ret = nla_parse_nested(tb, MPLS_IPTUNNEL_MAX, nla,
@@ -175,12 +176,18 @@ static int mpls_build_state(struct nlattr *nla,
return -EINVAL;
- newts = lwtunnel_state_alloc(sizeof(*tun_encap_info));
+ /* determine number of labels */
+ if (nla_get_labels(tb[MPLS_IPTUNNEL_DST],
+ MAX_NEW_LABELS, &n_labels, NULL))
+ return -EINVAL;
+
+ newts = lwtunnel_state_alloc(sizeof(*tun_encap_info) +
+ n_labels * sizeof(u32));
if (!newts)
return -ENOMEM;
tun_encap_info = mpls_lwtunnel_encap(newts);
- ret = nla_get_labels(tb[MPLS_IPTUNNEL_DST], MAX_NEW_LABELS,
+ ret = nla_get_labels(tb[MPLS_IPTUNNEL_DST], n_labels,
&tun_encap_info->labels, tun_encap_info->label);
if (ret)
goto errout;
@@ -257,7 +264,7 @@ static int mpls_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
a_hdr->default_ttl != b_hdr->default_ttl)
return 1;
- for (l = 0; l < MAX_NEW_LABELS; l++)
+ for (l = 0; l < a_hdr->labels; l++)
if (a_hdr->label[l] != b_hdr->label[l])
return 1;
return 0;