[mirror_ubuntu-artful-kernel.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)
		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
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
a505e582	76	if (!ring->pg_vec)
16f01365 PE	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,
62641903 ND	129	struct packet_diag_req *req,
a53b72c8	130	bool may_report_filterinfo,
62641903 ND	131	struct user_namespace *user_ns,
62641903 ND	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) &&
a53b72c8 EB	175	sock_diag_put_filterinfo(may_report_filterinfo, sk, skb,
a53b72c8 EB	176	PACKET_DIAG_FILTER))
e8d9612c ND	177	goto out_nlmsg_trim;
e8d9612c ND	178
053c095a JB	179	nlmsg_end(skb, nlh);
053c095a JB	180	return 0;
8a360be0 PE	181
	182	out_nlmsg_trim:
	183	nlmsg_cancel(skb, nlh);
	184	return -EMSGSIZE;
96ec6327 PE	185	}
	186
	187	static int packet_diag_dump(struct sk_buff skb, struct netlink_callback cb)
	188	{
	189	int num = 0, s_num = cb->args[0];
	190	struct packet_diag_req *req;
	191	struct net *net;
	192	struct sock *sk;
a53b72c8	193	bool may_report_filterinfo;
96ec6327 PE	194
	195	net = sock_net(skb->sk);
	196	req = nlmsg_data(cb->nlh);
90f62cf3	197	may_report_filterinfo = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
96ec6327	198
0fa7fa98	199	mutex_lock(&net->packet.sklist_lock);
b67bfe0d	200	sk_for_each(sk, &net->packet.sklist) {
96ec6327 PE	201	if (!net_eq(sock_net(sk), net))
	202	continue;
	203	if (num < s_num)
	204	goto next;
	205
62641903	206	if (sk_diag_fill(sk, skb, req,
a53b72c8	207	may_report_filterinfo,
62641903 ND	208	sk_user_ns(NETLINK_CB(cb->skb).sk),
	209	NETLINK_CB(cb->skb).portid,
	210	cb->nlh->nlmsg_seq, NLM_F_MULTI,
	211	sock_i_ino(sk)) < 0)
96ec6327 PE	212	goto done;
	213	next:
	214	num++;
	215	}
	216	done:
0fa7fa98	217	mutex_unlock(&net->packet.sklist_lock);
96ec6327 PE	218	cb->args[0] = num;
	219
	220	return skb->len;
	221	}
	222
	223	static int packet_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	224	{
	225	int hdrlen = sizeof(struct packet_diag_req);
	226	struct net *net = sock_net(skb->sk);
	227	struct packet_diag_req *req;
	228
	229	if (nlmsg_len(h) < hdrlen)
	230	return -EINVAL;
	231
	232	req = nlmsg_data(h);
	233	/* Make it possible to support protocol filtering later */
	234	if (req->sdiag_protocol)
	235	return -EINVAL;
	236
	237	if (h->nlmsg_flags & NLM_F_DUMP) {
	238	struct netlink_dump_control c = {
	239	.dump = packet_diag_dump,
	240	};
	241	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
	242	} else
	243	return -EOPNOTSUPP;
	244	}
	245
	246	static const struct sock_diag_handler packet_diag_handler = {
	247	.family = AF_PACKET,
	248	.dump = packet_diag_handler_dump,
	249	};
	250
	251	static int __init packet_diag_init(void)
	252	{
	253	return sock_diag_register(&packet_diag_handler);
	254	}
	255
	256	static void __exit packet_diag_exit(void)
	257	{
	258	sock_diag_unregister(&packet_diag_handler);
	259	}
	260
	261	module_init(packet_diag_init);
	262	module_exit(packet_diag_exit);
	263	MODULE_LICENSE("GPL");
	264	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);