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authorLorenzo Bianconi <lorenzo.bianconi@redhat.com>2017-12-22 15:10:18 +0100
committerDavid S. Miller <davem@davemloft.net>2017-12-27 12:11:51 -0500
commitf15bc54eeecd86dfba3885aab839cd1f45172a38 (patch)
treeb0ce5e53ca229d324ba653f64b9cc4ac34dd8e4b /net/l2tp/l2tp_netlink.c
parentl2tp: fix missing print session offset info (diff)
downloadlinux-dev-f15bc54eeecd86dfba3885aab839cd1f45172a38.tar.xz
linux-dev-f15bc54eeecd86dfba3885aab839cd1f45172a38.zip
l2tp: add peer_offset parameter
Introduce peer_offset parameter in order to add the capability to specify two different values for payload offset on tx/rx side. If just offset is provided by userspace use it for rx side as well in order to maintain compatibility with older l2tp versions Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_netlink.c')
-rw-r--r--net/l2tp/l2tp_netlink.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index 7e9c50125556..d7d4d7a7a54d 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -547,9 +547,25 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
}
if (tunnel->version > 2) {
- if (info->attrs[L2TP_ATTR_OFFSET])
+ if (info->attrs[L2TP_ATTR_PEER_OFFSET]) {
+ struct nlattr *peer_offset;
+
+ peer_offset = info->attrs[L2TP_ATTR_PEER_OFFSET];
+ cfg.peer_offset = nla_get_u16(peer_offset);
+ }
+
+ if (info->attrs[L2TP_ATTR_OFFSET]) {
cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
+ /* in order to maintain compatibility with older
+ * versions where offset was used for both tx and
+ * rx side, update rx side with offset if peer_offset
+ * is not provided by userspace
+ */
+ if (!info->attrs[L2TP_ATTR_PEER_OFFSET])
+ cfg.peer_offset = cfg.offset;
+ }
+
if (info->attrs[L2TP_ATTR_DATA_SEQ])
cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
@@ -763,6 +779,8 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int fl
nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
(session->offset &&
nla_put_u16(skb, L2TP_ATTR_OFFSET, session->offset)) ||
+ (session->peer_offset &&
+ nla_put_u16(skb, L2TP_ATTR_PEER_OFFSET, session->peer_offset)) ||
(session->cookie_len &&
nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
&session->cookie[0])) ||
@@ -903,6 +921,7 @@ static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
[L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
[L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
[L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
+ [L2TP_ATTR_PEER_OFFSET] = { .type = NLA_U16, },
[L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
[L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
[L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },