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

#include <linux/module.h>
#include <linux/sock_diag.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/packet_diag.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(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 || ((ver > TPACKET_V2) &&
				(nl_type == PACKET_DIAG_TX_RING)))
		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,
			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;

	return nlmsg_end(skb, nlh);

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;

	net = sock_net(skb->sk);
	req = nlmsg_data(cb->nlh);

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