net/bridge/br_netlink_tunnel.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *	Bridge per vlan tunnel port dst_metadata netlink control interface
  *
  *	Authors:
  *	Roopa Prabhu		<roopa@cumulusnetworks.com>
  */

 #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 */
 }

 bool vlan_tunid_inrange(const struct net_bridge_vlan *v_curr,
 			const struct net_bridge_vlan *v_last)
 {
 	__be32 tunid_curr = tunnel_id_to_key32(v_curr->tinfo.tunnel_id);
 	__be32 tunid_last = tunnel_id_to_key32(v_last->tinfo.tunnel_id);

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

 static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
 {
 	struct net_bridge_vlan *v, *vtbegin = NULL, *vtend = 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 (!vtbegin) {
 			goto initvars;
 		} else if ((v->vid - vtend->vid) == 1 &&
 			   vlan_tunid_inrange(v, vtend)) {
 			vtend = v;
 			continue;
 		} else {
 			if ((vtend->vid - vtbegin->vid) > 0)
 				num_tinfos += 2;
 			else
 				num_tinfos += 1;
 		}
 initvars:
 		vtbegin = v;
 		vtend = v;
 	}

 	if (vtbegin && vtend) {
 		if ((vtend->vid - vtbegin->vid) > 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_noflag(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 (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_tunid_inrange(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_UNSPEC] = {
 		.strict_start_type = IFLA_BRIDGE_VLAN_TUNNEL_FLAGS + 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 },
 };

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

 	if (!p)
 		return -EINVAL;

 	switch (cmd) {
 	case RTM_SETLINK:
 		err = nbp_vlan_tunnel_info_add(p, vid, tun_id);
 		if (!err)
 			*changed = true;
 		break;
 	case RTM_DELLINK:
 		if (!nbp_vlan_tunnel_info_delete(p, vid))
 			*changed = true;
 		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_deprecated(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
 					  attr, vlan_tunnel_policy, NULL);
 	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;
 }

 /* send a notification if v_curr can't enter the range and start a new one */
 static void __vlan_tunnel_handle_range(const struct net_bridge_port *p,
 				       struct net_bridge_vlan **v_start,
 				       struct net_bridge_vlan **v_end,
 				       int v_curr, bool curr_change)
 {
 	struct net_bridge_vlan_group *vg;
 	struct net_bridge_vlan *v;

 	vg = nbp_vlan_group(p);
 	if (!vg)
 		return;

 	v = br_vlan_find(vg, v_curr);

 	if (!*v_start)
 		goto out_init;

 	if (v && curr_change && br_vlan_can_enter_range(v, *v_end)) {
 		*v_end = v;
 		return;
 	}

 	br_vlan_notify(p->br, p, (*v_start)->vid, (*v_end)->vid, RTM_NEWVLAN);
 out_init:
 	/* we start a range only if there are any changes to notify about */
 	*v_start = curr_change ? v : NULL;
 	*v_end = *v_start;
 }

 int br_process_vlan_tunnel_info(const struct net_bridge *br,
 				const struct net_bridge_port *p, int cmd,
 				struct vtunnel_info *tinfo_curr,
 				struct vtunnel_info *tinfo_last,
 				bool *changed)
 {
 	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) {
 		struct net_bridge_vlan *v_start = NULL, *v_end = NULL;
 		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++) {
 			bool curr_change = false;

 			err = br_vlan_tunnel_info(p, cmd, v, t, &curr_change);
 			if (err)
 				break;
 			t++;

 			if (curr_change)
 				*changed = curr_change;
 			 __vlan_tunnel_handle_range(p, &v_start, &v_end, v,
 						    curr_change);
 		}
 		if (v_start && v_end)
 			br_vlan_notify(br, p, v_start->vid, v_end->vid,
 				       RTM_NEWVLAN);
 		if (err)
 			return err;

 		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, changed);
 		if (err)
 			return err;
 		br_vlan_notify(br, p, tinfo_curr->vid, 0, RTM_NEWVLAN);
 		memset(tinfo_last, 0, sizeof(struct vtunnel_info));
 		memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
 	}

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Bridge per vlan tunnel port dst_metadata netlink control interface
	*
	* Authors:
	* Roopa Prabhu <roopa@cumulusnetworks.com>
	*/

	#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 */
	}

	bool vlan_tunid_inrange(const struct net_bridge_vlan *v_curr,
	const struct net_bridge_vlan *v_last)
	{
	__be32 tunid_curr = tunnel_id_to_key32(v_curr->tinfo.tunnel_id);
	__be32 tunid_last = tunnel_id_to_key32(v_last->tinfo.tunnel_id);

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

	static int __get_num_vlan_tunnel_infos(struct net_bridge_vlan_group *vg)
	{
	struct net_bridge_vlan v, vtbegin = NULL, *vtend = 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 (!vtbegin) {
	goto initvars;
	} else if ((v->vid - vtend->vid) == 1 &&
	vlan_tunid_inrange(v, vtend)) {
	vtend = v;
	continue;
	} else {
	if ((vtend->vid - vtbegin->vid) > 0)
	num_tinfos += 2;
	else
	num_tinfos += 1;
	}
	initvars:
	vtbegin = v;
	vtend = v;
	}

	if (vtbegin && vtend) {
	if ((vtend->vid - vtbegin->vid) > 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_noflag(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 (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_tunid_inrange(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_UNSPEC] = {
	.strict_start_type = IFLA_BRIDGE_VLAN_TUNNEL_FLAGS + 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 },
	};

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

	if (!p)
	return -EINVAL;

	switch (cmd) {
	case RTM_SETLINK:
	err = nbp_vlan_tunnel_info_add(p, vid, tun_id);
	if (!err)
	*changed = true;
	break;
	case RTM_DELLINK:
	if (!nbp_vlan_tunnel_info_delete(p, vid))
	*changed = true;
	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_deprecated(tb, IFLA_BRIDGE_VLAN_TUNNEL_MAX,
	attr, vlan_tunnel_policy, NULL);
	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;
	}

	/* send a notification if v_curr can't enter the range and start a new one */
	static void __vlan_tunnel_handle_range(const struct net_bridge_port *p,
	struct net_bridge_vlan **v_start,
	struct net_bridge_vlan **v_end,
	int v_curr, bool curr_change)
	{
	struct net_bridge_vlan_group *vg;
	struct net_bridge_vlan *v;

	vg = nbp_vlan_group(p);
	if (!vg)
	return;

	v = br_vlan_find(vg, v_curr);

	if (!*v_start)
	goto out_init;

	if (v && curr_change && br_vlan_can_enter_range(v, *v_end)) {
	*v_end = v;
	return;
	}

	br_vlan_notify(p->br, p, (v_start)->vid, (v_end)->vid, RTM_NEWVLAN);
	out_init:
	/* we start a range only if there are any changes to notify about */
	*v_start = curr_change ? v : NULL;
	v_end = v_start;
	}

	int br_process_vlan_tunnel_info(const struct net_bridge *br,
	const struct net_bridge_port *p, int cmd,
	struct vtunnel_info *tinfo_curr,
	struct vtunnel_info *tinfo_last,
	bool *changed)
	{
	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) {
	struct net_bridge_vlan v_start = NULL, v_end = NULL;
	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++) {
	bool curr_change = false;

	err = br_vlan_tunnel_info(p, cmd, v, t, &curr_change);
	if (err)
	break;
	t++;

	if (curr_change)
	*changed = curr_change;
	__vlan_tunnel_handle_range(p, &v_start, &v_end, v,
	curr_change);
	}
	if (v_start && v_end)
	br_vlan_notify(br, p, v_start->vid, v_end->vid,
	RTM_NEWVLAN);
	if (err)
	return err;

	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, changed);
	if (err)
	return err;
	br_vlan_notify(br, p, tinfo_curr->vid, 0, RTM_NEWVLAN);
	memset(tinfo_last, 0, sizeof(struct vtunnel_info));
	memset(tinfo_curr, 0, sizeof(struct vtunnel_info));
	}

	return 0;
	}