[deliverable/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 <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(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;

	if ((req->pdiag_show & PACKET_SHOW_FILTER) &&
	    sock_diag_put_filterinfo(sk, skb, PACKET_DIAG_FILTER))
		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	5	#include <linux/packet_diag.h>
b0138408	6	#include <linux/percpu.h>
96ec6327 PE	7	#include <net/net_namespace.h>
	8	#include <net/sock.h>
	9
	10	#include "internal.h"
	11
8a360be0 PE	12	static int pdiag_put_info(const struct packet_sock po, struct sk_buff nlskb)
	13	{
	14	struct packet_diag_info pinfo;
	15
	16	pinfo.pdi_index = po->ifindex;
	17	pinfo.pdi_version = po->tp_version;
	18	pinfo.pdi_reserve = po->tp_reserve;
	19	pinfo.pdi_copy_thresh = po->copy_thresh;
	20	pinfo.pdi_tstamp = po->tp_tstamp;
	21
	22	pinfo.pdi_flags = 0;
	23	if (po->running)
	24	pinfo.pdi_flags \|= PDI_RUNNING;
	25	if (po->auxdata)
	26	pinfo.pdi_flags \|= PDI_AUXDATA;
	27	if (po->origdev)
	28	pinfo.pdi_flags \|= PDI_ORIGDEV;
	29	if (po->has_vnet_hdr)
	30	pinfo.pdi_flags \|= PDI_VNETHDR;
	31	if (po->tp_loss)
	32	pinfo.pdi_flags \|= PDI_LOSS;
	33
	34	return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
	35	}
	36
eea68e2f PE	37	static int pdiag_put_mclist(const struct packet_sock po, struct sk_buff nlskb)
	38	{
	39	struct nlattr *mca;
	40	struct packet_mclist *ml;
	41
	42	mca = nla_nest_start(nlskb, PACKET_DIAG_MCLIST);
	43	if (!mca)
	44	return -EMSGSIZE;
	45
	46	rtnl_lock();
	47	for (ml = po->mclist; ml; ml = ml->next) {
	48	struct packet_diag_mclist *dml;
	49
	50	dml = nla_reserve_nohdr(nlskb, sizeof(*dml));
	51	if (!dml) {
	52	rtnl_unlock();
	53	nla_nest_cancel(nlskb, mca);
	54	return -EMSGSIZE;
	55	}
	56
	57	dml->pdmc_index = ml->ifindex;
	58	dml->pdmc_type = ml->type;
	59	dml->pdmc_alen = ml->alen;
	60	dml->pdmc_count = ml->count;
	61	BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr));
	62	memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr));
	63	}
	64
	65	rtnl_unlock();
	66	nla_nest_end(nlskb, mca);
	67
	68	return 0;
	69	}
	70
16f01365 PE	71	static int pdiag_put_ring(struct packet_ring_buffer *ring, int ver, int nl_type,
	72	struct sk_buff *nlskb)
	73	{
	74	struct packet_diag_ring pdr;
	75
	76	if (!ring->pg_vec \|\| ((ver > TPACKET_V2) &&
	77	(nl_type == PACKET_DIAG_TX_RING)))
	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,
	130	struct packet_diag_req *req,
	131	struct user_namespace *user_ns,
	132	u32 portid, u32 seq, u32 flags, int sk_ino)
96ec6327 PE	133	{
	134	struct nlmsghdr *nlh;
	135	struct packet_diag_msg *rp;
16f01365	136	struct packet_sock *po = pkt_sk(sk);
96ec6327	137
15e47304	138	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
96ec6327 PE	139	if (!nlh)
	140	return -EMSGSIZE;
	141
	142	rp = nlmsg_data(nlh);
	143	rp->pdiag_family = AF_PACKET;
	144	rp->pdiag_type = sk->sk_type;
	145	rp->pdiag_num = ntohs(po->num);
	146	rp->pdiag_ino = sk_ino;
	147	sock_diag_save_cookie(sk, rp->pdiag_cookie);
	148
8a360be0 PE	149	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
	150	pdiag_put_info(po, skb))
	151	goto out_nlmsg_trim;
	152
62641903 ND	153	if ((req->pdiag_show & PACKET_SHOW_INFO) &&
	154	nla_put_u32(skb, PACKET_DIAG_UID,
	155	from_kuid_munged(user_ns, sock_i_uid(sk))))
	156	goto out_nlmsg_trim;
	157
eea68e2f PE	158	if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
	159	pdiag_put_mclist(po, skb))
	160	goto out_nlmsg_trim;
	161
16f01365 PE	162	if ((req->pdiag_show & PACKET_SHOW_RING_CFG) &&
	163	pdiag_put_rings_cfg(po, skb))
	164	goto out_nlmsg_trim;
	165
fff3321d PE	166	if ((req->pdiag_show & PACKET_SHOW_FANOUT) &&
	167	pdiag_put_fanout(po, skb))
	168	goto out_nlmsg_trim;
	169
76d0eeb1 ND	170	if ((req->pdiag_show & PACKET_SHOW_MEMINFO) &&
	171	sock_diag_put_meminfo(sk, skb, PACKET_DIAG_MEMINFO))
	172	goto out_nlmsg_trim;
	173
e8d9612c	174	if ((req->pdiag_show & PACKET_SHOW_FILTER) &&
78541c1d	175	sock_diag_put_filterinfo(sk, skb, PACKET_DIAG_FILTER))
e8d9612c ND	176	goto out_nlmsg_trim;
e8d9612c ND	177
96ec6327	178	return nlmsg_end(skb, nlh);
8a360be0 PE	179
	180	out_nlmsg_trim:
	181	nlmsg_cancel(skb, nlh);
	182	return -EMSGSIZE;
96ec6327 PE	183	}
	184
	185	static int packet_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	186	{
	187	int num = 0, s_num = cb->args[0];
	188	struct packet_diag_req *req;
	189	struct net *net;
	190	struct sock *sk;
96ec6327 PE	191
	192	net = sock_net(skb->sk);
	193	req = nlmsg_data(cb->nlh);
	194
0fa7fa98	195	mutex_lock(&net->packet.sklist_lock);
b67bfe0d	196	sk_for_each(sk, &net->packet.sklist) {
96ec6327 PE	197	if (!net_eq(sock_net(sk), net))
	198	continue;
	199	if (num < s_num)
	200	goto next;
	201
62641903 ND	202	if (sk_diag_fill(sk, skb, req,
	203	sk_user_ns(NETLINK_CB(cb->skb).sk),
	204	NETLINK_CB(cb->skb).portid,
	205	cb->nlh->nlmsg_seq, NLM_F_MULTI,
	206	sock_i_ino(sk)) < 0)
96ec6327 PE	207	goto done;
	208	next:
	209	num++;
	210	}
	211	done:
0fa7fa98	212	mutex_unlock(&net->packet.sklist_lock);
96ec6327 PE	213	cb->args[0] = num;
	214
	215	return skb->len;
	216	}
	217
	218	static int packet_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	219	{
	220	int hdrlen = sizeof(struct packet_diag_req);
	221	struct net *net = sock_net(skb->sk);
	222	struct packet_diag_req *req;
	223
	224	if (nlmsg_len(h) < hdrlen)
	225	return -EINVAL;
	226
	227	req = nlmsg_data(h);
	228	/* Make it possible to support protocol filtering later */
	229	if (req->sdiag_protocol)
	230	return -EINVAL;
	231
	232	if (h->nlmsg_flags & NLM_F_DUMP) {
	233	struct netlink_dump_control c = {
	234	.dump = packet_diag_dump,
	235	};
	236	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	237	} else
	238	return -EOPNOTSUPP;
	239	}
	240
	241	static const struct sock_diag_handler packet_diag_handler = {
	242	.family = AF_PACKET,
	243	.dump = packet_diag_handler_dump,
	244	};
	245
	246	static int __init packet_diag_init(void)
	247	{
	248	return sock_diag_register(&packet_diag_handler);
	249	}
	250
	251	static void __exit packet_diag_exit(void)
	252	{
	253	sock_diag_unregister(&packet_diag_handler);
	254	}
	255
	256	module_init(packet_diag_init);
	257	module_exit(packet_diag_exit);
	258	MODULE_LICENSE("GPL");
	259	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);