[linux-2.6-block.git] / net / ethtool / tunnels.c

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/ethtool_netlink.h>
#include <net/udp_tunnel.h>
#include <net/vxlan.h>

#include "bitset.h"
#include "common.h"
#include "netlink.h"

static const struct nla_policy
ethtool_tunnel_info_policy[ETHTOOL_A_TUNNEL_INFO_MAX + 1] = {
	[ETHTOOL_A_TUNNEL_INFO_UNSPEC]		= { .type = NLA_REJECT },
	[ETHTOOL_A_TUNNEL_INFO_HEADER]		= { .type = NLA_NESTED },
};

static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN == ilog2(UDP_TUNNEL_TYPE_VXLAN));
static_assert(ETHTOOL_UDP_TUNNEL_TYPE_GENEVE == ilog2(UDP_TUNNEL_TYPE_GENEVE));
static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE ==
	      ilog2(UDP_TUNNEL_TYPE_VXLAN_GPE));

static ssize_t ethnl_udp_table_reply_size(unsigned int types, bool compact)
{
	ssize_t size;

	size = ethnl_bitset32_size(&types, NULL, __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
				   udp_tunnel_type_names, compact);
	if (size < 0)
		return size;

	return size +
		nla_total_size(0) + /* _UDP_TABLE */
		nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
}

static ssize_t
ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
			     struct netlink_ext_ack *extack)
{
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	const struct udp_tunnel_nic_info *info;
	unsigned int i;
	ssize_t ret;
	size_t size;

	info = req_base->dev->udp_tunnel_nic_info;
	if (!info) {
		NL_SET_ERR_MSG(extack,
			       "device does not report tunnel offload info");
		return -EOPNOTSUPP;
	}

	size =	nla_total_size(0); /* _INFO_UDP_PORTS */

	for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
		if (!info->tables[i].n_entries)
			break;

		ret = ethnl_udp_table_reply_size(info->tables[i].tunnel_types,
						 compact);
		if (ret < 0)
			return ret;
		size += ret;

		size += udp_tunnel_nic_dump_size(req_base->dev, i);
	}

	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
		ret = ethnl_udp_table_reply_size(0, compact);
		if (ret < 0)
			return ret;
		size += ret;

		size += nla_total_size(0) +		 /* _TABLE_ENTRY */
			nla_total_size(sizeof(__be16)) + /* _ENTRY_PORT */
			nla_total_size(sizeof(u32));	 /* _ENTRY_TYPE */
	}

	return size;
}

static int
ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
			     struct sk_buff *skb)
{
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	const struct udp_tunnel_nic_info *info;
	struct nlattr *ports, *table, *entry;
	unsigned int i;

	info = req_base->dev->udp_tunnel_nic_info;
	if (!info)
		return -EOPNOTSUPP;

	ports = nla_nest_start(skb, ETHTOOL_A_TUNNEL_INFO_UDP_PORTS);
	if (!ports)
		return -EMSGSIZE;

	for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
		if (!info->tables[i].n_entries)
			break;

		table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
		if (!table)
			goto err_cancel_ports;

		if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE,
				info->tables[i].n_entries))
			goto err_cancel_table;

		if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
				       &info->tables[i].tunnel_types, NULL,
				       __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
				       udp_tunnel_type_names, compact))
			goto err_cancel_table;

		if (udp_tunnel_nic_dump_write(req_base->dev, i, skb))
			goto err_cancel_table;

		nla_nest_end(skb, table);
	}

	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
		u32 zero = 0;

		table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
		if (!table)
			goto err_cancel_ports;

		if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE, 1))
			goto err_cancel_table;

		if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
				       &zero, NULL,
				       __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
				       udp_tunnel_type_names, compact))
			goto err_cancel_table;

		entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);

		if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
				 htons(IANA_VXLAN_UDP_PORT)) ||
		    nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,
				ilog2(UDP_TUNNEL_TYPE_VXLAN)))
			goto err_cancel_entry;

		nla_nest_end(skb, entry);
		nla_nest_end(skb, table);
	}

	nla_nest_end(skb, ports);

	return 0;

err_cancel_entry:
	nla_nest_cancel(skb, entry);
err_cancel_table:
	nla_nest_cancel(skb, table);
err_cancel_ports:
	nla_nest_cancel(skb, ports);
	return -EMSGSIZE;
}

static int
ethnl_tunnel_info_req_parse(struct ethnl_req_info *req_info,
			    const struct nlmsghdr *nlhdr, struct net *net,
			    struct netlink_ext_ack *extack, bool require_dev)
{
	struct nlattr *tb[ETHTOOL_A_TUNNEL_INFO_MAX + 1];
	int ret;

	ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_TUNNEL_INFO_MAX,
			  ethtool_tunnel_info_policy, extack);
	if (ret < 0)
		return ret;

	return ethnl_parse_header_dev_get(req_info,
					  tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
					  net, extack, require_dev);
}

int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
{
	struct ethnl_req_info req_info = {};
	struct sk_buff *rskb;
	void *reply_payload;
	int reply_len;
	int ret;

	ret = ethnl_tunnel_info_req_parse(&req_info, info->nlhdr,
					  genl_info_net(info), info->extack,
					  true);
	if (ret < 0)
		return ret;

	rtnl_lock();
	ret = ethnl_tunnel_info_reply_size(&req_info, info->extack);
	if (ret < 0)
		goto err_unlock_rtnl;
	reply_len = ret + ethnl_reply_header_size();

	rskb = ethnl_reply_init(reply_len, req_info.dev,
				ETHTOOL_MSG_TUNNEL_INFO_GET,
				ETHTOOL_A_TUNNEL_INFO_HEADER,
				info, &reply_payload);
	if (!rskb) {
		ret = -ENOMEM;
		goto err_unlock_rtnl;
	}

	ret = ethnl_tunnel_info_fill_reply(&req_info, rskb);
	if (ret)
		goto err_free_msg;
	rtnl_unlock();
	dev_put(req_info.dev);
	genlmsg_end(rskb, reply_payload);

	return genlmsg_reply(rskb, info);

err_free_msg:
	nlmsg_free(rskb);
err_unlock_rtnl:
	rtnl_unlock();
	dev_put(req_info.dev);
	return ret;
}

struct ethnl_tunnel_info_dump_ctx {
	struct ethnl_req_info	req_info;
	int			pos_hash;
	int			pos_idx;
};

int ethnl_tunnel_info_start(struct netlink_callback *cb)
{
	struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
	int ret;

	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));

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

	ret = ethnl_tunnel_info_req_parse(&ctx->req_info, cb->nlh,
					  sock_net(cb->skb->sk), cb->extack,
					  false);
	if (ctx->req_info.dev) {
		dev_put(ctx->req_info.dev);
		ctx->req_info.dev = NULL;
	}

	return ret;
}

int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
	struct net *net = sock_net(skb->sk);
	int s_idx = ctx->pos_idx;
	int h, idx = 0;
	int ret = 0;
	void *ehdr;

	rtnl_lock();
	cb->seq = net->dev_base_seq;
	for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
		struct hlist_head *head;
		struct net_device *dev;

		head = &net->dev_index_head[h];
		idx = 0;
		hlist_for_each_entry(dev, head, index_hlist) {
			if (idx < s_idx)
				goto cont;

			ehdr = ethnl_dump_put(skb, cb,
					      ETHTOOL_MSG_TUNNEL_INFO_GET);
			if (!ehdr) {
				ret = -EMSGSIZE;
				goto out;
			}

			ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_TUNNEL_INFO_HEADER);
			if (ret < 0) {
				genlmsg_cancel(skb, ehdr);
				goto out;
			}

			ctx->req_info.dev = dev;
			ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
			ctx->req_info.dev = NULL;
			if (ret < 0) {
				genlmsg_cancel(skb, ehdr);
				if (ret == -EOPNOTSUPP)
					goto cont;
				goto out;
			}
			genlmsg_end(skb, ehdr);
cont:
			idx++;
		}
	}
out:
	rtnl_unlock();

	ctx->pos_hash = h;
	ctx->pos_idx = idx;
	nl_dump_check_consistent(cb, nlmsg_hdr(skb));

	if (ret == -EMSGSIZE && skb->len)
		return skb->len;
	return ret;
}
Commit	Line	Data
c7d759eb JK	1	// SPDX-License-Identifier: GPL-2.0-only
	2
	3	#include <linux/ethtool_netlink.h>
	4	#include <net/udp_tunnel.h>
966e5059	5	#include <net/vxlan.h>
c7d759eb JK	6
	7	#include "bitset.h"
	8	#include "common.h"
	9	#include "netlink.h"
	10
	11	static const struct nla_policy
	12	ethtool_tunnel_info_policy[ETHTOOL_A_TUNNEL_INFO_MAX + 1] = {
	13	[ETHTOOL_A_TUNNEL_INFO_UNSPEC] = { .type = NLA_REJECT },
	14	[ETHTOOL_A_TUNNEL_INFO_HEADER] = { .type = NLA_NESTED },
	15	};
	16
	17	static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN == ilog2(UDP_TUNNEL_TYPE_VXLAN));
	18	static_assert(ETHTOOL_UDP_TUNNEL_TYPE_GENEVE == ilog2(UDP_TUNNEL_TYPE_GENEVE));
	19	static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE ==
	20	ilog2(UDP_TUNNEL_TYPE_VXLAN_GPE));
	21
966e5059 JK	22	static ssize_t ethnl_udp_table_reply_size(unsigned int types, bool compact)
	23	{
	24	ssize_t size;
	25
	26	size = ethnl_bitset32_size(&types, NULL, __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
	27	udp_tunnel_type_names, compact);
	28	if (size < 0)
	29	return size;
	30
	31	return size +
	32	nla_total_size(0) + /* _UDP_TABLE */
	33	nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
	34	}
	35
c7d759eb JK	36	static ssize_t
	37	ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
	38	struct netlink_ext_ack *extack)
	39	{
	40	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	41	const struct udp_tunnel_nic_info *info;
	42	unsigned int i;
966e5059	43	ssize_t ret;
c7d759eb	44	size_t size;
c7d759eb JK	45
	46	info = req_base->dev->udp_tunnel_nic_info;
	47	if (!info) {
	48	NL_SET_ERR_MSG(extack,
	49	"device does not report tunnel offload info");
	50	return -EOPNOTSUPP;
	51	}
	52
	53	size = nla_total_size(0); /* _INFO_UDP_PORTS */
	54
	55	for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
	56	if (!info->tables[i].n_entries)
966e5059	57	break;
c7d759eb	58
966e5059 JK	59	ret = ethnl_udp_table_reply_size(info->tables[i].tunnel_types,
966e5059 JK	60	compact);
c7d759eb JK	61	if (ret < 0)
	62	return ret;
	63	size += ret;
	64
	65	size += udp_tunnel_nic_dump_size(req_base->dev, i);
	66	}
	67
966e5059 JK	68	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
	69	ret = ethnl_udp_table_reply_size(0, compact);
	70	if (ret < 0)
	71	return ret;
	72	size += ret;
	73
	74	size += nla_total_size(0) + /* _TABLE_ENTRY */
	75	nla_total_size(sizeof(__be16)) + /* _ENTRY_PORT */
	76	nla_total_size(sizeof(u32)); /* _ENTRY_TYPE */
	77	}
	78
c7d759eb JK	79	return size;
	80	}
	81
	82	static int
	83	ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
	84	struct sk_buff *skb)
	85	{
	86	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	87	const struct udp_tunnel_nic_info *info;
966e5059	88	struct nlattr ports, table, *entry;
c7d759eb JK	89	unsigned int i;
	90
	91	info = req_base->dev->udp_tunnel_nic_info;
	92	if (!info)
	93	return -EOPNOTSUPP;
	94
	95	ports = nla_nest_start(skb, ETHTOOL_A_TUNNEL_INFO_UDP_PORTS);
	96	if (!ports)
	97	return -EMSGSIZE;
	98
	99	for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
	100	if (!info->tables[i].n_entries)
	101	break;
	102
	103	table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
	104	if (!table)
	105	goto err_cancel_ports;
	106
	107	if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE,
	108	info->tables[i].n_entries))
	109	goto err_cancel_table;
	110
	111	if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
	112	&info->tables[i].tunnel_types, NULL,
	113	__ETHTOOL_UDP_TUNNEL_TYPE_CNT,
	114	udp_tunnel_type_names, compact))
	115	goto err_cancel_table;
	116
	117	if (udp_tunnel_nic_dump_write(req_base->dev, i, skb))
	118	goto err_cancel_table;
	119
	120	nla_nest_end(skb, table);
	121	}
	122
966e5059 JK	123	if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
	124	u32 zero = 0;
	125
	126	table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
	127	if (!table)
	128	goto err_cancel_ports;
	129
	130	if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE, 1))
	131	goto err_cancel_table;
	132
	133	if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
	134	&zero, NULL,
	135	__ETHTOOL_UDP_TUNNEL_TYPE_CNT,
	136	udp_tunnel_type_names, compact))
	137	goto err_cancel_table;
	138
	139	entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
	140
	141	if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
	142	htons(IANA_VXLAN_UDP_PORT)) \|\|
	143	nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,
	144	ilog2(UDP_TUNNEL_TYPE_VXLAN)))
	145	goto err_cancel_entry;
	146
	147	nla_nest_end(skb, entry);
	148	nla_nest_end(skb, table);
	149	}
	150
c7d759eb JK	151	nla_nest_end(skb, ports);
	152
	153	return 0;
	154
966e5059 JK	155	err_cancel_entry:
966e5059 JK	156	nla_nest_cancel(skb, entry);
c7d759eb JK	157	err_cancel_table:
	158	nla_nest_cancel(skb, table);
	159	err_cancel_ports:
	160	nla_nest_cancel(skb, ports);
	161	return -EMSGSIZE;
	162	}
	163
	164	static int
	165	ethnl_tunnel_info_req_parse(struct ethnl_req_info *req_info,
	166	const struct nlmsghdr nlhdr, struct net net,
	167	struct netlink_ext_ack *extack, bool require_dev)
	168	{
	169	struct nlattr *tb[ETHTOOL_A_TUNNEL_INFO_MAX + 1];
	170	int ret;
	171
	172	ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_TUNNEL_INFO_MAX,
	173	ethtool_tunnel_info_policy, extack);
	174	if (ret < 0)
	175	return ret;
	176
	177	return ethnl_parse_header_dev_get(req_info,
	178	tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
	179	net, extack, require_dev);
	180	}
	181
	182	int ethnl_tunnel_info_doit(struct sk_buff skb, struct genl_info info)
	183	{
	184	struct ethnl_req_info req_info = {};
	185	struct sk_buff *rskb;
	186	void *reply_payload;
	187	int reply_len;
	188	int ret;
	189
	190	ret = ethnl_tunnel_info_req_parse(&req_info, info->nlhdr,
	191	genl_info_net(info), info->extack,
	192	true);
	193	if (ret < 0)
	194	return ret;
	195
	196	rtnl_lock();
	197	ret = ethnl_tunnel_info_reply_size(&req_info, info->extack);
	198	if (ret < 0)
	199	goto err_unlock_rtnl;
	200	reply_len = ret + ethnl_reply_header_size();
	201
	202	rskb = ethnl_reply_init(reply_len, req_info.dev,
	203	ETHTOOL_MSG_TUNNEL_INFO_GET,
	204	ETHTOOL_A_TUNNEL_INFO_HEADER,
	205	info, &reply_payload);
	206	if (!rskb) {
	207	ret = -ENOMEM;
	208	goto err_unlock_rtnl;
	209	}
	210
	211	ret = ethnl_tunnel_info_fill_reply(&req_info, rskb);
	212	if (ret)
	213	goto err_free_msg;
	214	rtnl_unlock();
	215	dev_put(req_info.dev);
	216	genlmsg_end(rskb, reply_payload);
	217
	218	return genlmsg_reply(rskb, info);
	219
	220	err_free_msg:
221	nlmsg_free(rskb);
222	err_unlock_rtnl:
223	rtnl_unlock();
224	dev_put(req_info.dev);
225	return ret;
226	}
227
228	struct ethnl_tunnel_info_dump_ctx {
229	struct ethnl_req_info req_info;
230	int pos_hash;
231	int pos_idx;
232	};
233
234	int ethnl_tunnel_info_start(struct netlink_callback *cb)
235	{
236	struct ethnl_tunnel_info_dump_ctx ctx = (void )cb->ctx;
237	int ret;
238
239	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
240
241	memset(ctx, 0, sizeof(*ctx));
242
243	ret = ethnl_tunnel_info_req_parse(&ctx->req_info, cb->nlh,
244	sock_net(cb->skb->sk), cb->extack,
245	false);
246	if (ctx->req_info.dev) {
247	dev_put(ctx->req_info.dev);
248	ctx->req_info.dev = NULL;
249	}
250
251	return ret;
252	}
253
254	int ethnl_tunnel_info_dumpit(struct sk_buff skb, struct netlink_callback cb)
255	{
256	struct ethnl_tunnel_info_dump_ctx ctx = (void )cb->ctx;
257	struct net *net = sock_net(skb->sk);
258	int s_idx = ctx->pos_idx;
259	int h, idx = 0;
260	int ret = 0;
261	void *ehdr;
262
263	rtnl_lock();
264	cb->seq = net->dev_base_seq;
265	for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
266	struct hlist_head *head;
267	struct net_device *dev;
268
269	head = &net->dev_index_head[h];
270	idx = 0;
271	hlist_for_each_entry(dev, head, index_hlist) {
272	if (idx < s_idx)
273	goto cont;
274
275	ehdr = ethnl_dump_put(skb, cb,
276	ETHTOOL_MSG_TUNNEL_INFO_GET);
277	if (!ehdr) {
278	ret = -EMSGSIZE;
279	goto out;
280	}
281
282	ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_TUNNEL_INFO_HEADER);
283	if (ret < 0) {
284	genlmsg_cancel(skb, ehdr);
285	goto out;
286	}
287
288	ctx->req_info.dev = dev;
289	ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
290	ctx->req_info.dev = NULL;
291	if (ret < 0) {
292	genlmsg_cancel(skb, ehdr);
293	if (ret == -EOPNOTSUPP)
294	goto cont;
295	goto out;
296	}
297	genlmsg_end(skb, ehdr);
298	cont:
299	idx++;
300	}
301	}
302	out:
303	rtnl_unlock();
304
305	ctx->pos_hash = h;
306	ctx->pos_idx = idx;
307	nl_dump_check_consistent(cb, nlmsg_hdr(skb));
308
309	if (ret == -EMSGSIZE && skb->len)
310	return skb->len;
311	return ret;
312	}