[mirror_ubuntu-eoan-kernel.git] / net / bridge / br_netlink_tunnel.c

/*
 *	Bridge per vlan tunnel port dst_metadata netlink control interface
 *
 *	Authors:
 *	Roopa Prabhu		<roopa@cumulusnetworks.com>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/etherdevice.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <uapi/linux/if_bridge.h>
#include <net/dst_metadata.h>

#include "br_private.h"
#include "br_private_tunnel.h"

static size_t __get_vlan_tinfo_size(void)
{
	return nla_total_size(0) + /* nest IFLA_BRIDGE_VLAN_TUNNEL_INFO */
		  nla_total_size(sizeof(u32)) + /* IFLA_BRIDGE_VLAN_TUNNEL_ID */
		  nla_total_size(sizeof(u16)) + /* IFLA_BRIDGE_VLAN_TUNNEL_VID */
		  nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_VLAN_TUNNEL_FLAGS */
}

static bool vlan_tunnel_id_isrange(struct net_bridge_vlan *v,
				   struct net_bridge_vlan *v_end)
{
	__be32 tunid_curr = tunnel_id_to_key32(v->tinfo.tunnel_id);
	__be32 tunid_end = tunnel_id_to_key32(v_end->tinfo.tunnel_id);

	return (be32_to_cpu(tunid_curr) - be32_to_cpu(tunid_end)) == 1;
}

static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
{
	struct net_bridge_vlan *v, *v_start = NULL, *v_end = NULL;
	int num_tinfos = 0;

	/* Count number of vlan infos */
	list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
		/* only a context, bridge vlan not activated */
		if (!br_vlan_should_use(v) || !v->tinfo.tunnel_id)
			continue;

		if (!v_start) {
			goto initvars;
		} else if ((v->vid - v_end->vid) == 1 &&
			   vlan_tunnel_id_isrange(v_end, v) == 1) {
			v_end = v;
			continue;
		} else {
			if ((v_end->vid - v->vid) > 0 &&
			    vlan_tunnel_id_isrange(v_end, v) > 0)
				num_tinfos += 2;
			else
				num_tinfos += 1;
		}
initvars:
		v_start = v;
		v_end = v;
	}

	if (v_start) {
		if ((v_end->vid - v->vid) > 0 &&
		    vlan_tunnel_id_isrange(v_end, v) > 0)
			num_tinfos += 2;
		else
			num_tinfos += 1;
	}

	return num_tinfos;
}

int br_get_vlan_tunnel_info_size(struct net_bridge_vlan_group *vg)
{
	int num_tinfos;

	if (!vg)
		return 0;

	rcu_read_lock();
	num_tinfos = __get_num_vlan_tunnel_infos(vg);
	rcu_read_unlock();

	return num_tinfos * __get_vlan_tinfo_size();
}

static int br_fill_vlan_tinfo(struct sk_buff *skb, u16 vid,
			      __be64 tunnel_id, u16 flags)
{
	__be32 tid = tunnel_id_to_key32(tunnel_id);
	struct nlattr *tmap;

	tmap = nla_nest_start(skb, IFLA_BRIDGE_VLAN_TUNNEL_INFO);
	if (!tmap)
		return -EMSGSIZE;
	if (nla_put_u32(skb, IFLA_BRIDGE_VLAN_TUNNEL_ID,
			be32_to_cpu(tid)))
		goto nla_put_failure;
	if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_VID,
			vid))
		goto nla_put_failure;
	if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_FLAGS,
			flags))
		goto nla_put_failure;
	nla_nest_end(skb, tmap);

	return 0;

nla_put_failure:
	nla_nest_cancel(skb, tmap);

	return -EMSGSIZE;
}

static int br_fill_vlan_tinfo_range(struct sk_buff *skb,
				    struct net_bridge_vlan *vtbegin,
				    struct net_bridge_vlan *vtend)
{
	int err;

	if (vtbegin && vtend && (vtend->vid - vtbegin->vid) > 0) {
		/* add range to skb */
		err = br_fill_vlan_tinfo(skb, vtbegin->vid,
					 vtbegin->tinfo.tunnel_id,
					 BRIDGE_VLAN_INFO_RANGE_BEGIN);
		if (err)
			return err;

		err = br_fill_vlan_tinfo(skb, vtend->vid,
					 vtend->tinfo.tunnel_id,
					 BRIDGE_VLAN_INFO_RANGE_END);
		if (err)
			return err;
	} else {
		err = br_fill_vlan_tinfo(skb, vtbegin->vid,
					 vtbegin->tinfo.tunnel_id,
					 0);
		if (err)
			return err;
	}

	return 0;
}

int br_fill_vlan_tunnel_info(struct sk_buff *skb,
			     struct net_bridge_vlan_group *vg)
{
	struct net_bridge_vlan *vtbegin = NULL;
	struct net_bridge_vlan *vtend = NULL;
	struct net_bridge_vlan *v;
	int err;

	/* Count number of vlan infos */
	list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
		/* only a context, bridge vlan not activated */
		if (!br_vlan_should_use(v))
			continue;

		if (!v->tinfo.tunnel_dst)
			continue;

		if (!vtbegin) {
			goto initvars;
		} else if ((v->vid - vtend->vid) == 1 &&
			    vlan_tunnel_id_isrange(v, vtend)) {
			vtend = v;
			continue;
		} else {
			err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
			if (err)
				return err;
		}
initvars:
		vtbegin = v;
		vtend = v;
	}

	if (vtbegin) {
		err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
		if (err)
			return err;
	}

	return 0;
}

static const struct nla_policy vlan_tunnel_policy[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1] = {
	[IFLA_BRIDGE_VLAN_TUNNEL_ID] = { .type = NLA_U32 },
	[IFLA_BRIDGE_VLAN_TUNNEL_VID] = { .type = NLA_U16 },
	[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS] = { .type = NLA_U16 },
};

static int br_vlan_tunnel_info(struct net_bridge_port *p, int cmd,
			       u16 vid, u32 tun_id)
{
	int err = 0;

	if (!p)
		return -EINVAL;

	switch (cmd) {
	case RTM_SETLINK:
		err = nbp_vlan_tunnel_info_add(p, vid, tun_id);
		break;
	case RTM_DELLINK:
		nbp_vlan_tunnel_info_delete(p, vid);
		break;
	}

	return err;
}

int br_parse_vlan_tunnel_info(struct nlattr *attr,
			      struct vtunnel_info *tinfo)
{
	struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
	u32 tun_id;
	u16 vid, flags = 0;
	int err;

	memset(tinfo, 0, sizeof(*tinfo));

	err = nla_parse_nested(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
			       attr, vlan_tunnel_policy);
	if (err < 0)
		return err;

	if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] ||
	    !tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
		return -EINVAL;

	tun_id = nla_get_u32(tb[IFLA_BRIDGE_VLAN_TUNNEL_ID]);
	vid = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_VID]);
	if (vid >= VLAN_VID_MASK)
		return -ERANGE;

	if (tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS])
		flags = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS]);

	tinfo->tunid = tun_id;
	tinfo->vid = vid;
	tinfo->flags = flags;

	return 0;
}

int br_process_vlan_tunnel_info(struct net_bridge *br,
				struct net_bridge_port *p, int cmd,
				struct vtunnel_info *tinfo_curr,
				struct vtunnel_info *tinfo_last)
{
	int err;

	if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
		if (tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
			return -EINVAL;
		memcpy(tinfo_last, tinfo_curr, sizeof(struct vtunnel_info));
	} else if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END) {
		int t, v;

		if (!(tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN))
			return -EINVAL;
		if ((tinfo_curr->vid - tinfo_last->vid) !=
		    (tinfo_curr->tunid - tinfo_last->tunid))
			return -EINVAL;
		t = tinfo_last->tunid;
		for (v = tinfo_last->vid; v <= tinfo_curr->vid; v++) {
			err = br_vlan_tunnel_info(p, cmd, v, t);
			if (err)
				return err;
			t++;
		}
		memset(tinfo_last, 0, sizeof(struct vtunnel_info));
		memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
	} else {
		if (tinfo_last->flags)
			return -EINVAL;
		err = br_vlan_tunnel_info(p, cmd, tinfo_curr->vid,
					  tinfo_curr->tunid);
		if (err)
			return err;
		memset(tinfo_last, 0, sizeof(struct vtunnel_info));
		memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
	}

	return 0;
}
Commit	Line	Data
efa5356b RP	1	/*
	2	* Bridge per vlan tunnel port dst_metadata netlink control interface
	3	*
	4	* Authors:
	5	* Roopa Prabhu <roopa@cumulusnetworks.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/slab.h>
	15	#include <linux/etherdevice.h>
	16	#include <net/rtnetlink.h>
	17	#include <net/net_namespace.h>
	18	#include <net/sock.h>
	19	#include <uapi/linux/if_bridge.h>
	20	#include <net/dst_metadata.h>
	21
	22	#include "br_private.h"
	23	#include "br_private_tunnel.h"
	24
	25	static size_t __get_vlan_tinfo_size(void)
	26	{
	27	return nla_total_size(0) + /* nest IFLA_BRIDGE_VLAN_TUNNEL_INFO */
	28	nla_total_size(sizeof(u32)) + /* IFLA_BRIDGE_VLAN_TUNNEL_ID */
	29	nla_total_size(sizeof(u16)) + /* IFLA_BRIDGE_VLAN_TUNNEL_VID */
	30	nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_VLAN_TUNNEL_FLAGS */
	31	}
	32
	33	static bool vlan_tunnel_id_isrange(struct net_bridge_vlan *v,
	34	struct net_bridge_vlan *v_end)
	35	{
	36	__be32 tunid_curr = tunnel_id_to_key32(v->tinfo.tunnel_id);
	37	__be32 tunid_end = tunnel_id_to_key32(v_end->tinfo.tunnel_id);
	38
	39	return (be32_to_cpu(tunid_curr) - be32_to_cpu(tunid_end)) == 1;
	40	}
	41
	42	static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
	43	{
	44	struct net_bridge_vlan v, v_start = NULL, *v_end = NULL;
	45	int num_tinfos = 0;
	46
	47	/* Count number of vlan infos */
	48	list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
	49	/* only a context, bridge vlan not activated */
	50	if (!br_vlan_should_use(v) \|\| !v->tinfo.tunnel_id)
	51	continue;
	52
	53	if (!v_start) {
	54	goto initvars;
	55	} else if ((v->vid - v_end->vid) == 1 &&
	56	vlan_tunnel_id_isrange(v_end, v) == 1) {
	57	v_end = v;
	58	continue;
	59	} else {
	60	if ((v_end->vid - v->vid) > 0 &&
	61	vlan_tunnel_id_isrange(v_end, v) > 0)
	62	num_tinfos += 2;
	63	else
	64	num_tinfos += 1;
65	}
66	initvars:
67	v_start = v;
68	v_end = v;
69	}
70
71	if (v_start) {
72	if ((v_end->vid - v->vid) > 0 &&
73	vlan_tunnel_id_isrange(v_end, v) > 0)
74	num_tinfos += 2;
75	else
76	num_tinfos += 1;
77	}
78
79	return num_tinfos;
80	}
81
82	int br_get_vlan_tunnel_info_size(struct net_bridge_vlan_group *vg)
83	{
84	int num_tinfos;
85
86	if (!vg)
87	return 0;
88
89	rcu_read_lock();
90	num_tinfos = __get_num_vlan_tunnel_infos(vg);
91	rcu_read_unlock();
92
93	return num_tinfos * __get_vlan_tinfo_size();
94	}
95
96	static int br_fill_vlan_tinfo(struct sk_buff *skb, u16 vid,
97	__be64 tunnel_id, u16 flags)
98	{
99	__be32 tid = tunnel_id_to_key32(tunnel_id);
100	struct nlattr *tmap;
101
102	tmap = nla_nest_start(skb, IFLA_BRIDGE_VLAN_TUNNEL_INFO);
103	if (!tmap)
104	return -EMSGSIZE;
105	if (nla_put_u32(skb, IFLA_BRIDGE_VLAN_TUNNEL_ID,
106	be32_to_cpu(tid)))
107	goto nla_put_failure;
108	if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_VID,
109	vid))
110	goto nla_put_failure;
111	if (nla_put_u16(skb, IFLA_BRIDGE_VLAN_TUNNEL_FLAGS,
112	flags))
113	goto nla_put_failure;
114	nla_nest_end(skb, tmap);
115
116	return 0;
117
118	nla_put_failure:
119	nla_nest_cancel(skb, tmap);
120
121	return -EMSGSIZE;
122	}
123
124	static int br_fill_vlan_tinfo_range(struct sk_buff *skb,
125	struct net_bridge_vlan *vtbegin,
126	struct net_bridge_vlan *vtend)
127	{
128	int err;
129
130	if (vtbegin && vtend && (vtend->vid - vtbegin->vid) > 0) {
131	/* add range to skb */
132	err = br_fill_vlan_tinfo(skb, vtbegin->vid,
133	vtbegin->tinfo.tunnel_id,
134	BRIDGE_VLAN_INFO_RANGE_BEGIN);
135	if (err)
136	return err;
137
138	err = br_fill_vlan_tinfo(skb, vtend->vid,
139	vtend->tinfo.tunnel_id,
140	BRIDGE_VLAN_INFO_RANGE_END);
141	if (err)
142	return err;
143	} else {
144	err = br_fill_vlan_tinfo(skb, vtbegin->vid,
145	vtbegin->tinfo.tunnel_id,
146	0);
147	if (err)
148	return err;
149	}
150
151	return 0;
152	}
153
154	int br_fill_vlan_tunnel_info(struct sk_buff *skb,
155	struct net_bridge_vlan_group *vg)
156	{
157	struct net_bridge_vlan *vtbegin = NULL;
158	struct net_bridge_vlan *vtend = NULL;
159	struct net_bridge_vlan *v;
160	int err;
161
162	/* Count number of vlan infos */
163	list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
164	/* only a context, bridge vlan not activated */
165	if (!br_vlan_should_use(v))
166	continue;
167
168	if (!v->tinfo.tunnel_dst)
169	continue;
170
171	if (!vtbegin) {
172	goto initvars;
173	} else if ((v->vid - vtend->vid) == 1 &&
174	vlan_tunnel_id_isrange(v, vtend)) {
175	vtend = v;
176	continue;
177	} else {
178	err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
179	if (err)
180	return err;
181	}
182	initvars:
183	vtbegin = v;
184	vtend = v;
185	}
186
187	if (vtbegin) {
188	err = br_fill_vlan_tinfo_range(skb, vtbegin, vtend);
189	if (err)
190	return err;
191	}
192
193	return 0;
194	}
195
196	static const struct nla_policy vlan_tunnel_policy[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1] = {
197	[IFLA_BRIDGE_VLAN_TUNNEL_ID] = { .type = NLA_U32 },
198	[IFLA_BRIDGE_VLAN_TUNNEL_VID] = { .type = NLA_U16 },
199	[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS] = { .type = NLA_U16 },
200	};
201
202	static int br_vlan_tunnel_info(struct net_bridge_port *p, int cmd,
203	u16 vid, u32 tun_id)
204	{
205	int err = 0;
206
207	if (!p)
208	return -EINVAL;
209
210	switch (cmd) {
211	case RTM_SETLINK:
212	err = nbp_vlan_tunnel_info_add(p, vid, tun_id);
213	break;
214	case RTM_DELLINK:
215	nbp_vlan_tunnel_info_delete(p, vid);
216	break;
217	}
218
219	return err;
220	}
221
222	int br_parse_vlan_tunnel_info(struct nlattr *attr,
223	struct vtunnel_info *tinfo)
224	{
225	struct nlattr *tb[IFLA_BRIDGE_VLAN_TUNNEL_MAX + 1];
226	u32 tun_id;
227	u16 vid, flags = 0;
228	int err;
229
230	memset(tinfo, 0, sizeof(*tinfo));
231
efa5356b RP	232	err = nla_parse_nested(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
	233	attr, vlan_tunnel_policy);
	234	if (err < 0)
	235	return err;
	236
bb580ad6 NA	237	if (!tb[IFLA_BRIDGE_VLAN_TUNNEL_ID] \|\|
	238	!tb[IFLA_BRIDGE_VLAN_TUNNEL_VID])
	239	return -EINVAL;
	240
efa5356b RP	241	tun_id = nla_get_u32(tb[IFLA_BRIDGE_VLAN_TUNNEL_ID]);
	242	vid = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_VID]);
	243	if (vid >= VLAN_VID_MASK)
	244	return -ERANGE;
	245
	246	if (tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS])
	247	flags = nla_get_u16(tb[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS]);
	248
	249	tinfo->tunid = tun_id;
	250	tinfo->vid = vid;
	251	tinfo->flags = flags;
	252
	253	return 0;
	254	}
	255
	256	int br_process_vlan_tunnel_info(struct net_bridge *br,
	257	struct net_bridge_port *p, int cmd,
	258	struct vtunnel_info *tinfo_curr,
	259	struct vtunnel_info *tinfo_last)
	260	{
	261	int err;
	262
	263	if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
	264	if (tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
	265	return -EINVAL;
	266	memcpy(tinfo_last, tinfo_curr, sizeof(struct vtunnel_info));
	267	} else if (tinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END) {
	268	int t, v;
	269
	270	if (!(tinfo_last->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN))
	271	return -EINVAL;
	272	if ((tinfo_curr->vid - tinfo_last->vid) !=
	273	(tinfo_curr->tunid - tinfo_last->tunid))
	274	return -EINVAL;
	275	t = tinfo_last->tunid;
	276	for (v = tinfo_last->vid; v <= tinfo_curr->vid; v++) {
	277	err = br_vlan_tunnel_info(p, cmd, v, t);
	278	if (err)
	279	return err;
	280	t++;
	281	}
	282	memset(tinfo_last, 0, sizeof(struct vtunnel_info));
	283	memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
	284	} else {
	285	if (tinfo_last->flags)
	286	return -EINVAL;
	287	err = br_vlan_tunnel_info(p, cmd, tinfo_curr->vid,
	288	tinfo_curr->tunid);
	289	if (err)
	290	return err;
	291	memset(tinfo_last, 0, sizeof(struct vtunnel_info));
	292	memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
	293	}
	294
	295	return 0;
	296	}