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Commit f15bc54e authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by David S. Miller
Browse files

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: default avatarLorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 820da535

include/uapi/linux/l2tp.h

+1 −0
Original line number Diff line number Diff line
@@ -127,6 +127,7 @@ enum { 
	L2TP_ATTR_UDP_ZERO_CSUM6_TX,	/* flag */

	L2TP_ATTR_UDP_ZERO_CSUM6_RX,	/* flag */

	L2TP_ATTR_PAD,

	L2TP_ATTR_PEER_OFFSET,		/* u16 */

	__L2TP_ATTR_MAX,

};

net/l2tp/l2tp_core.c

+2 −1
Original line number Diff line number Diff line
@@ -792,7 +792,7 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, 
			ptr += 2 + offset;

		}

	} else

		ptr += session->offset;

		ptr += session->peer_offset;



	offset = ptr - optr;

	if (!pskb_may_pull(skb, offset))
@@ -1785,6 +1785,7 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn 
			session->lns_mode = cfg->lns_mode;

			session->reorder_timeout = cfg->reorder_timeout;

			session->offset = cfg->offset;

			session->peer_offset = cfg->peer_offset;

			session->l2specific_type = cfg->l2specific_type;

			session->l2specific_len = cfg->l2specific_len;

			session->cookie_len = cfg->cookie_len;

net/l2tp/l2tp_core.h

+10 −3
Original line number Diff line number Diff line
@@ -59,7 +59,8 @@ struct l2tp_session_cfg { 
	int			debug;		/* bitmask of debug message

						 * categories */

	u16			vlan_id;	/* VLAN pseudowire only */

	u16			offset;		/* offset to payload */

	u16			offset;		/* offset to tx payload */

	u16			peer_offset;	/* offset to rx payload */

	u16			l2specific_len;	/* Layer 2 specific length */

	u16			l2specific_type; /* Layer 2 specific type */

	u8			cookie[8];	/* optional cookie */
@@ -86,8 +87,14 @@ struct l2tp_session { 
	int			cookie_len;

	u8			peer_cookie[8];

	int			peer_cookie_len;

	u16			offset;		/* offset from end of L2TP header

						   to beginning of data */

	u16			offset;		/* offset from end of L2TP

						 * header to beginning of

						 * tx data

						 */

	u16			peer_offset;	/* offset from end of L2TP

						 * header to beginning of

						 * rx data

						 */

	u16			l2specific_len;

	u16			l2specific_type;

	u16			hdr_len;

net/l2tp/l2tp_debugfs.c

+5 −3
Original line number Diff line number Diff line
@@ -180,8 +180,9 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v) 
		   session->lns_mode ? "LNS" : "LAC",

		   session->debug,

		   jiffies_to_msecs(session->reorder_timeout));

	seq_printf(m, "   offset %hu l2specific %hu/%hu\n",

		   session->offset, session->l2specific_type, session->l2specific_len);

	seq_printf(m, "   offset %hu peer_offset %hu l2specific %hu/%hu\n",

		   session->offset, session->peer_offset,

		   session->l2specific_type, session->l2specific_len);

	if (session->cookie_len) {

		seq_printf(m, "   cookie %02x%02x%02x%02x",

			   session->cookie[0], session->cookie[1],
@@ -228,7 +229,8 @@ static int l2tp_dfs_seq_show(struct seq_file *m, void *v) 
		seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");

		seq_puts(m, "  SESSION ID, peer ID, PWTYPE\n");

		seq_puts(m, "   refcnt cnt\n");

		seq_puts(m, "   offset OFFSET l2specific TYPE/LEN\n");

		seq_puts(m, "   offset OFFSET peer_offset OFFSET");

		seq_puts(m, " l2specific TYPE/LEN\n");

		seq_puts(m, "   [ cookie ]\n");

		seq_puts(m, "   [ peer cookie ]\n");

		seq_puts(m, "   config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");

net/l2tp/l2tp_netlink.c

+20 −1
Original line number Diff line number Diff line
@@ -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, },