[linux-block.git] / net / packet / diag.c

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/module.h>
#include <linux/sock_diag.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/packet_diag.h>
#include <linux/percpu.h>
#include <net/net_namespace.h>
#include <net/sock.h>

#include "internal.h"

static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb)
{
	struct packet_diag_info pinfo;

	pinfo.pdi_index = po->ifindex;
	pinfo.pdi_version = po->tp_version;
	pinfo.pdi_reserve = po->tp_reserve;
	pinfo.pdi_copy_thresh = po->copy_thresh;
	pinfo.pdi_tstamp = po->tp_tstamp;

	pinfo.pdi_flags = 0;
	if (po->running)
		pinfo.pdi_flags |= PDI_RUNNING;
	if (po->auxdata)
		pinfo.pdi_flags |= PDI_AUXDATA;
	if (po->origdev)
		pinfo.pdi_flags |= PDI_ORIGDEV;
	if (po->has_vnet_hdr)
		pinfo.pdi_flags |= PDI_VNETHDR;
	if (po->tp_loss)
		pinfo.pdi_flags |= PDI_LOSS;

	return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
}

static int pdiag_put_mclist(const struct packet_sock *po, struct sk_buff *nlskb)
{
	struct nlattr *mca;
	struct packet_mclist *ml;

	mca = nla_nest_start_noflag(nlskb, PACKET_DIAG_MCLIST);
	if (!mca)
		return -EMSGSIZE;

	rtnl_lock();
	for (ml = po->mclist; ml; ml = ml->next) {
		struct packet_diag_mclist *dml;

		dml = nla_reserve_nohdr(nlskb, sizeof(*dml));
		if (!dml) {
			rtnl_unlock();
			nla_nest_cancel(nlskb, mca);
			return -EMSGSIZE;
		}

		dml->pdmc_index = ml->ifindex;
		dml->pdmc_type = ml->type;
		dml->pdmc_alen = ml->alen;
		dml->pdmc_count = ml->count;
		BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr));
		memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr));
	}

	rtnl_unlock();
	nla_nest_end(nlskb, mca);

	return 0;
}

static int pdiag_put_ring(struct packet_ring_buffer *ring, int ver, int nl_type,
		struct sk_buff *nlskb)
{
	struct packet_diag_ring pdr;

	if (!ring->pg_vec)
		return 0;

	pdr.pdr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
	pdr.pdr_block_nr = ring->pg_vec_len;
	pdr.pdr_frame_size = ring->frame_size;
	pdr.pdr_frame_nr = ring->frame_max + 1;

	if (ver > TPACKET_V2) {
		pdr.pdr_retire_tmo = ring->prb_bdqc.retire_blk_tov;
		pdr.pdr_sizeof_priv = ring->prb_bdqc.blk_sizeof_priv;
		pdr.pdr_features = ring->prb_bdqc.feature_req_word;
	} else {
		pdr.pdr_retire_tmo = 0;
		pdr.pdr_sizeof_priv = 0;
		pdr.pdr_features = 0;
	}

	return nla_put(nlskb, nl_type, sizeof(pdr), &pdr);
}

static int pdiag_put_rings_cfg(struct packet_sock *po, struct sk_buff *skb)
{
	int ret;

	mutex_lock(&po->pg_vec_lock);
	ret = pdiag_put_ring(&po->rx_ring, po->tp_version,
			PACKET_DIAG_RX_RING, skb);
	if (!ret)
		ret = pdiag_put_ring(&po->tx_ring, po->tp_version,
				PACKET_DIAG_TX_RING, skb);
	mutex_unlock(&po->pg_vec_lock);

	return ret;
}

static int pdiag_put_fanout(struct packet_sock *po, struct sk_buff *nlskb)
{
	int ret = 0;

	mutex_lock(&fanout_mutex);
	if (po->fanout) {
		u32 val;

		val = (u32)po->fanout->id | ((u32)po->fanout->type << 16);
		ret = nla_put_u32(nlskb, PACKET_DIAG_FANOUT, val);
	}
	mutex_unlock(&fanout_mutex);

	return ret;
}

static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
			struct packet_diag_req *req,
			bool may_report_filterinfo,
			struct user_namespace *user_ns,
			u32 portid, u32 seq, u32 flags, int sk_ino)
{
	struct nlmsghdr *nlh;
	struct packet_diag_msg *rp;
	struct packet_sock *po = pkt_sk(sk);

	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
	if (!nlh)
		return -EMSGSIZE;

	rp = nlmsg_data(nlh);
	rp->pdiag_family = AF_PACKET;
	rp->pdiag_type = sk->sk_type;
	rp->pdiag_num = ntohs(po->num);
	rp->pdiag_ino = sk_ino;
	sock_diag_save_cookie(sk, rp->pdiag_cookie);

	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
			pdiag_put_info(po, skb))
		goto out_nlmsg_trim;

	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
	    nla_put_u32(skb, PACKET_DIAG_UID,
			from_kuid_munged(user_ns, sock_i_uid(sk))))
		goto out_nlmsg_trim;

	if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
			pdiag_put_mclist(po, skb))
		goto out_nlmsg_trim;

	if ((req->pdiag_show & PACKET_SHOW_RING_CFG) &&
			pdiag_put_rings_cfg(po, skb))
		goto out_nlmsg_trim;

	if ((req->pdiag_show & PACKET_SHOW_FANOUT) &&
			pdiag_put_fanout(po, skb))
		goto out_nlmsg_trim;

	if ((req->pdiag_show & PACKET_SHOW_MEMINFO) &&
	    sock_diag_put_meminfo(sk, skb, PACKET_DIAG_MEMINFO))
		goto out_nlmsg_trim;

	if ((req->pdiag_show & PACKET_SHOW_FILTER) &&
	    sock_diag_put_filterinfo(may_report_filterinfo, sk, skb,
				     PACKET_DIAG_FILTER))
		goto out_nlmsg_trim;

	nlmsg_end(skb, nlh);
	return 0;

out_nlmsg_trim:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	int num = 0, s_num = cb->args[0];
	struct packet_diag_req *req;
	struct net *net;
	struct sock *sk;
	bool may_report_filterinfo;

	net = sock_net(skb->sk);
	req = nlmsg_data(cb->nlh);
	may_report_filterinfo = netlink_net_capable(cb->skb, CAP_NET_ADMIN);

	mutex_lock(&net->packet.sklist_lock);
	sk_for_each(sk, &net->packet.sklist) {
		if (!net_eq(sock_net(sk), net))
			continue;
		if (num < s_num)
			goto next;

		if (sk_diag_fill(sk, skb, req,
				 may_report_filterinfo,
				 sk_user_ns(NETLINK_CB(cb->skb).sk),
				 NETLINK_CB(cb->skb).portid,
				 cb->nlh->nlmsg_seq, NLM_F_MULTI,
				 sock_i_ino(sk)) < 0)
			goto done;
next:
		num++;
	}
done:
	mutex_unlock(&net->packet.sklist_lock);
	cb->args[0] = num;

	return skb->len;
}

static int packet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
{
	int hdrlen = sizeof(struct packet_diag_req);
	struct net *net = sock_net(skb->sk);
	struct packet_diag_req *req;

	if (nlmsg_len(h) < hdrlen)
		return -EINVAL;

	req = nlmsg_data(h);
	/* Make it possible to support protocol filtering later */
	if (req->sdiag_protocol)
		return -EINVAL;

	if (h->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.dump = packet_diag_dump,
		};
		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	} else
		return -EOPNOTSUPP;
}

static const struct sock_diag_handler packet_diag_handler = {
	.family = AF_PACKET,
	.dump = packet_diag_handler_dump,
};

static int __init packet_diag_init(void)
{
	return sock_diag_register(&packet_diag_handler);
}

static void __exit packet_diag_exit(void)
{
	sock_diag_unregister(&packet_diag_handler);
}

module_init(packet_diag_init);
module_exit(packet_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
96ec6327 PE	2	#include <linux/module.h>
	3	#include <linux/sock_diag.h>
	4	#include <linux/net.h>
eea68e2f	5	#include <linux/netdevice.h>
96ec6327	6	#include <linux/packet_diag.h>
b0138408	7	#include <linux/percpu.h>
96ec6327 PE	8	#include <net/net_namespace.h>
	9	#include <net/sock.h>
	10
	11	#include "internal.h"
	12
8a360be0 PE	13	static int pdiag_put_info(const struct packet_sock po, struct sk_buff nlskb)
	14	{
	15	struct packet_diag_info pinfo;
	16
	17	pinfo.pdi_index = po->ifindex;
	18	pinfo.pdi_version = po->tp_version;
	19	pinfo.pdi_reserve = po->tp_reserve;
	20	pinfo.pdi_copy_thresh = po->copy_thresh;
	21	pinfo.pdi_tstamp = po->tp_tstamp;
	22
	23	pinfo.pdi_flags = 0;
	24	if (po->running)
	25	pinfo.pdi_flags \|= PDI_RUNNING;
	26	if (po->auxdata)
	27	pinfo.pdi_flags \|= PDI_AUXDATA;
	28	if (po->origdev)
	29	pinfo.pdi_flags \|= PDI_ORIGDEV;
	30	if (po->has_vnet_hdr)
	31	pinfo.pdi_flags \|= PDI_VNETHDR;
	32	if (po->tp_loss)
	33	pinfo.pdi_flags \|= PDI_LOSS;
	34
	35	return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
	36	}
	37
eea68e2f PE	38	static int pdiag_put_mclist(const struct packet_sock po, struct sk_buff nlskb)
	39	{
	40	struct nlattr *mca;
	41	struct packet_mclist *ml;
	42
ae0be8de	43	mca = nla_nest_start_noflag(nlskb, PACKET_DIAG_MCLIST);
eea68e2f PE	44	if (!mca)
	45	return -EMSGSIZE;
	46
	47	rtnl_lock();
	48	for (ml = po->mclist; ml; ml = ml->next) {
	49	struct packet_diag_mclist *dml;
	50
	51	dml = nla_reserve_nohdr(nlskb, sizeof(*dml));
	52	if (!dml) {
	53	rtnl_unlock();
	54	nla_nest_cancel(nlskb, mca);
	55	return -EMSGSIZE;
	56	}
	57
	58	dml->pdmc_index = ml->ifindex;
	59	dml->pdmc_type = ml->type;
	60	dml->pdmc_alen = ml->alen;
	61	dml->pdmc_count = ml->count;
	62	BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr));
	63	memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr));
	64	}
	65
	66	rtnl_unlock();
	67	nla_nest_end(nlskb, mca);
	68
	69	return 0;
	70	}
	71
16f01365 PE	72	static int pdiag_put_ring(struct packet_ring_buffer *ring, int ver, int nl_type,
	73	struct sk_buff *nlskb)
	74	{
	75	struct packet_diag_ring pdr;
	76
a505e582	77	if (!ring->pg_vec)
16f01365 PE	78	return 0;
	79
	80	pdr.pdr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
	81	pdr.pdr_block_nr = ring->pg_vec_len;
	82	pdr.pdr_frame_size = ring->frame_size;
	83	pdr.pdr_frame_nr = ring->frame_max + 1;
	84
	85	if (ver > TPACKET_V2) {
	86	pdr.pdr_retire_tmo = ring->prb_bdqc.retire_blk_tov;
	87	pdr.pdr_sizeof_priv = ring->prb_bdqc.blk_sizeof_priv;
	88	pdr.pdr_features = ring->prb_bdqc.feature_req_word;
	89	} else {
	90	pdr.pdr_retire_tmo = 0;
	91	pdr.pdr_sizeof_priv = 0;
	92	pdr.pdr_features = 0;
	93	}
	94
	95	return nla_put(nlskb, nl_type, sizeof(pdr), &pdr);
	96	}
	97
	98	static int pdiag_put_rings_cfg(struct packet_sock po, struct sk_buff skb)
	99	{
	100	int ret;
	101
	102	mutex_lock(&po->pg_vec_lock);
	103	ret = pdiag_put_ring(&po->rx_ring, po->tp_version,
	104	PACKET_DIAG_RX_RING, skb);
	105	if (!ret)
	106	ret = pdiag_put_ring(&po->tx_ring, po->tp_version,
	107	PACKET_DIAG_TX_RING, skb);
	108	mutex_unlock(&po->pg_vec_lock);
	109
	110	return ret;
	111	}
	112
fff3321d PE	113	static int pdiag_put_fanout(struct packet_sock po, struct sk_buff nlskb)
	114	{
	115	int ret = 0;
	116
	117	mutex_lock(&fanout_mutex);
	118	if (po->fanout) {
	119	u32 val;
	120
	121	val = (u32)po->fanout->id \| ((u32)po->fanout->type << 16);
	122	ret = nla_put_u32(nlskb, PACKET_DIAG_FANOUT, val);
	123	}
	124	mutex_unlock(&fanout_mutex);
	125
	126	return ret;
	127	}
	128
62641903 ND	129	static int sk_diag_fill(struct sock sk, struct sk_buff skb,
62641903 ND	130	struct packet_diag_req *req,
a53b72c8	131	bool may_report_filterinfo,
62641903 ND	132	struct user_namespace *user_ns,
62641903 ND	133	u32 portid, u32 seq, u32 flags, int sk_ino)
96ec6327 PE	134	{
	135	struct nlmsghdr *nlh;
	136	struct packet_diag_msg *rp;
16f01365	137	struct packet_sock *po = pkt_sk(sk);
96ec6327	138
15e47304	139	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
96ec6327 PE	140	if (!nlh)
	141	return -EMSGSIZE;
	142
	143	rp = nlmsg_data(nlh);
	144	rp->pdiag_family = AF_PACKET;
	145	rp->pdiag_type = sk->sk_type;
	146	rp->pdiag_num = ntohs(po->num);
	147	rp->pdiag_ino = sk_ino;
	148	sock_diag_save_cookie(sk, rp->pdiag_cookie);
	149
8a360be0 PE	150	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
	151	pdiag_put_info(po, skb))
	152	goto out_nlmsg_trim;
	153
62641903 ND	154	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
	155	nla_put_u32(skb, PACKET_DIAG_UID,
	156	from_kuid_munged(user_ns, sock_i_uid(sk))))
	157	goto out_nlmsg_trim;
	158
eea68e2f PE	159	if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
	160	pdiag_put_mclist(po, skb))
	161	goto out_nlmsg_trim;
	162
16f01365 PE	163	if ((req->pdiag_show & PACKET_SHOW_RING_CFG) &&
	164	pdiag_put_rings_cfg(po, skb))
	165	goto out_nlmsg_trim;
	166
fff3321d PE	167	if ((req->pdiag_show & PACKET_SHOW_FANOUT) &&
	168	pdiag_put_fanout(po, skb))
	169	goto out_nlmsg_trim;
	170
76d0eeb1 ND	171	if ((req->pdiag_show & PACKET_SHOW_MEMINFO) &&
	172	sock_diag_put_meminfo(sk, skb, PACKET_DIAG_MEMINFO))
	173	goto out_nlmsg_trim;
	174
e8d9612c	175	if ((req->pdiag_show & PACKET_SHOW_FILTER) &&
a53b72c8 EB	176	sock_diag_put_filterinfo(may_report_filterinfo, sk, skb,
a53b72c8 EB	177	PACKET_DIAG_FILTER))
e8d9612c ND	178	goto out_nlmsg_trim;
e8d9612c ND	179
053c095a JB	180	nlmsg_end(skb, nlh);
053c095a JB	181	return 0;
8a360be0 PE	182
	183	out_nlmsg_trim:
	184	nlmsg_cancel(skb, nlh);
	185	return -EMSGSIZE;
96ec6327 PE	186	}
	187
	188	static int packet_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	189	{
	190	int num = 0, s_num = cb->args[0];
	191	struct packet_diag_req *req;
	192	struct net *net;
	193	struct sock *sk;
a53b72c8	194	bool may_report_filterinfo;
96ec6327 PE	195
	196	net = sock_net(skb->sk);
	197	req = nlmsg_data(cb->nlh);
90f62cf3	198	may_report_filterinfo = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
96ec6327	199
0fa7fa98	200	mutex_lock(&net->packet.sklist_lock);
b67bfe0d	201	sk_for_each(sk, &net->packet.sklist) {
96ec6327 PE	202	if (!net_eq(sock_net(sk), net))
	203	continue;
	204	if (num < s_num)
	205	goto next;
	206
62641903	207	if (sk_diag_fill(sk, skb, req,
a53b72c8	208	may_report_filterinfo,
62641903 ND	209	sk_user_ns(NETLINK_CB(cb->skb).sk),
	210	NETLINK_CB(cb->skb).portid,
	211	cb->nlh->nlmsg_seq, NLM_F_MULTI,
	212	sock_i_ino(sk)) < 0)
96ec6327 PE	213	goto done;
	214	next:
	215	num++;
	216	}
	217	done:
0fa7fa98	218	mutex_unlock(&net->packet.sklist_lock);
96ec6327 PE	219	cb->args[0] = num;
	220
	221	return skb->len;
	222	}
	223
	224	static int packet_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	225	{
	226	int hdrlen = sizeof(struct packet_diag_req);
	227	struct net *net = sock_net(skb->sk);
	228	struct packet_diag_req *req;
	229
	230	if (nlmsg_len(h) < hdrlen)
	231	return -EINVAL;
	232
	233	req = nlmsg_data(h);
	234	/* Make it possible to support protocol filtering later */
	235	if (req->sdiag_protocol)
	236	return -EINVAL;
	237
	238	if (h->nlmsg_flags & NLM_F_DUMP) {
	239	struct netlink_dump_control c = {
	240	.dump = packet_diag_dump,
	241	};
	242	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	243	} else
	244	return -EOPNOTSUPP;
	245	}
	246
	247	static const struct sock_diag_handler packet_diag_handler = {
	248	.family = AF_PACKET,
	249	.dump = packet_diag_handler_dump,
	250	};
	251
	252	static int __init packet_diag_init(void)
	253	{
	254	return sock_diag_register(&packet_diag_handler);
	255	}
	256
	257	static void __exit packet_diag_exit(void)
	258	{
	259	sock_diag_unregister(&packet_diag_handler);
	260	}
	261
	262	module_init(packet_diag_init);
	263	module_exit(packet_diag_exit);
	264	MODULE_LICENSE("GPL");
	265	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);