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

// SPDX-License-Identifier: GPL-2.0-or-later
/* SCTP kernel implementation
 * (C) Copyright Red Hat Inc. 2017
 *
 * This file is part of the SCTP kernel implementation
 *
 * These functions implement sctp diag support.
 *
 * Please send any bug reports or fixes you make to the
 * email addresched(es):
 *    lksctp developers <[email protected]>
 *
 * Written or modified by:
 *    Xin Long <[email protected]>
 */

#include <linux/module.h>
#include <linux/inet_diag.h>
#include <linux/sock_diag.h>
#include <net/sctp/sctp.h>

static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
			       void *info);

/* define some functions to make asoc/ep fill look clean */
static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
					struct sock *sk,
					struct sctp_association *asoc)
{
	union sctp_addr laddr, paddr;
	struct dst_entry *dst;
	struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;

	laddr = list_entry(asoc->base.bind_addr.address_list.next,
			   struct sctp_sockaddr_entry, list)->a;
	paddr = asoc->peer.primary_path->ipaddr;
	dst = asoc->peer.primary_path->dst;

	r->idiag_family = sk->sk_family;
	r->id.idiag_sport = htons(asoc->base.bind_addr.port);
	r->id.idiag_dport = htons(asoc->peer.port);
	r->id.idiag_if = dst ? dst->dev->ifindex : 0;
	sock_diag_save_cookie(sk, r->id.idiag_cookie);

#if IS_ENABLED(CONFIG_IPV6)
	if (sk->sk_family == AF_INET6) {
		*(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
		*(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
	} else
#endif
	{
		memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
		memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));

		r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
		r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
	}

	r->idiag_state = asoc->state;
	if (timer_pending(t3_rtx)) {
		r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
		r->idiag_retrans = asoc->rtx_data_chunks;
		r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
	} else {
		r->idiag_timer = 0;
		r->idiag_retrans = 0;
		r->idiag_expires = 0;
	}
}

static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
					 struct list_head *address_list)
{
	struct sctp_sockaddr_entry *laddr;
	int addrlen = sizeof(struct sockaddr_storage);
	int addrcnt = 0;
	struct nlattr *attr;
	void *info = NULL;

	list_for_each_entry_rcu(laddr, address_list, list)
		addrcnt++;

	attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
	if (!attr)
		return -EMSGSIZE;

	info = nla_data(attr);
	list_for_each_entry_rcu(laddr, address_list, list) {
		memcpy(info, &laddr->a, sizeof(laddr->a));
		memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
		info += addrlen;
	}

	return 0;
}

static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
					struct sctp_association *asoc)
{
	int addrlen = sizeof(struct sockaddr_storage);
	struct sctp_transport *from;
	struct nlattr *attr;
	void *info = NULL;

	attr = nla_reserve(skb, INET_DIAG_PEERS,
			   addrlen * asoc->peer.transport_count);
	if (!attr)
		return -EMSGSIZE;

	info = nla_data(attr);
	list_for_each_entry(from, &asoc->peer.transport_addr_list,
			    transports) {
		memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
		memset(info + sizeof(from->ipaddr), 0,
		       addrlen - sizeof(from->ipaddr));
		info += addrlen;
	}

	return 0;
}

/* sctp asoc/ep fill*/
static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
			       struct sk_buff *skb,
			       const struct inet_diag_req_v2 *req,
			       struct user_namespace *user_ns,
			       int portid, u32 seq, u16 nlmsg_flags,
			       const struct nlmsghdr *unlh,
			       bool net_admin)
{
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	struct list_head *addr_list;
	struct inet_diag_msg *r;
	struct nlmsghdr  *nlh;
	int ext = req->idiag_ext;
	struct sctp_infox infox;
	void *info = NULL;

	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
			nlmsg_flags);
	if (!nlh)
		return -EMSGSIZE;

	r = nlmsg_data(nlh);
	BUG_ON(!sk_fullsock(sk));

	if (asoc) {
		inet_diag_msg_sctpasoc_fill(r, sk, asoc);
	} else {
		inet_diag_msg_common_fill(r, sk);
		r->idiag_state = sk->sk_state;
		r->idiag_timer = 0;
		r->idiag_retrans = 0;
	}

	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
		goto errout;

	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
		u32 mem[SK_MEMINFO_VARS];
		int amt;

		if (asoc && asoc->ep->sndbuf_policy)
			amt = asoc->sndbuf_used;
		else
			amt = sk_wmem_alloc_get(sk);
		mem[SK_MEMINFO_WMEM_ALLOC] = amt;
		if (asoc && asoc->ep->rcvbuf_policy)
			amt = atomic_read(&asoc->rmem_alloc);
		else
			amt = sk_rmem_alloc_get(sk);
		mem[SK_MEMINFO_RMEM_ALLOC] = amt;
		mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
		mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
		mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
		mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
		mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
		mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
		mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);

		if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
			goto errout;
	}

	if (ext & (1 << (INET_DIAG_INFO - 1))) {
		struct nlattr *attr;

		attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
					 sizeof(struct sctp_info),
					 INET_DIAG_PAD);
		if (!attr)
			goto errout;

		info = nla_data(attr);
	}
	infox.sctpinfo = (struct sctp_info *)info;
	infox.asoc = asoc;
	sctp_diag_get_info(sk, r, &infox);

	addr_list = asoc ? &asoc->base.bind_addr.address_list
			 : &ep->base.bind_addr.address_list;
	if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
		goto errout;

	if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
		if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
			goto errout;

	if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
		goto errout;

	nlmsg_end(skb, nlh);
	return 0;

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

/* callback and param */
struct sctp_comm_param {
	struct sk_buff *skb;
	struct netlink_callback *cb;
	const struct inet_diag_req_v2 *r;
	const struct nlmsghdr *nlh;
	bool net_admin;
};

static size_t inet_assoc_attr_size(struct sctp_association *asoc)
{
	int addrlen = sizeof(struct sockaddr_storage);
	int addrcnt = 0;
	struct sctp_sockaddr_entry *laddr;

	list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
				list)
		addrcnt++;

	return	  nla_total_size(sizeof(struct sctp_info))
		+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
		+ nla_total_size(1) /* INET_DIAG_TOS */
		+ nla_total_size(1) /* INET_DIAG_TCLASS */
		+ nla_total_size(4) /* INET_DIAG_MARK */
		+ nla_total_size(4) /* INET_DIAG_CLASS_ID */
		+ nla_total_size(addrlen * asoc->peer.transport_count)
		+ nla_total_size(addrlen * addrcnt)
		+ nla_total_size(sizeof(struct inet_diag_meminfo))
		+ nla_total_size(sizeof(struct inet_diag_msg))
		+ 64;
}

static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
{
	struct sctp_association *assoc = tsp->asoc;
	struct sock *sk = tsp->asoc->base.sk;
	struct sctp_comm_param *commp = p;
	struct sk_buff *in_skb = commp->skb;
	const struct inet_diag_req_v2 *req = commp->r;
	const struct nlmsghdr *nlh = commp->nlh;
	struct net *net = sock_net(in_skb->sk);
	struct sk_buff *rep;
	int err;

	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
	if (err)
		goto out;

	err = -ENOMEM;
	rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
	if (!rep)
		goto out;

	lock_sock(sk);
	if (sk != assoc->base.sk) {
		release_sock(sk);
		sk = assoc->base.sk;
		lock_sock(sk);
	}
	err = inet_sctp_diag_fill(sk, assoc, rep, req,
				  sk_user_ns(NETLINK_CB(in_skb).sk),
				  NETLINK_CB(in_skb).portid,
				  nlh->nlmsg_seq, 0, nlh,
				  commp->net_admin);
	release_sock(sk);
	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(rep);
		goto out;
	}

	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
			      MSG_DONTWAIT);
	if (err > 0)
		err = 0;
out:
	return err;
}

static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
{
	struct sctp_endpoint *ep = tsp->asoc->ep;
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	struct sk_buff *skb = commp->skb;
	struct netlink_callback *cb = commp->cb;
	const struct inet_diag_req_v2 *r = commp->r;
	struct sctp_association *assoc;
	int err = 0;

	lock_sock(sk);
	list_for_each_entry(assoc, &ep->asocs, asocs) {
		if (cb->args[4] < cb->args[1])
			goto next;

		if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
		    r->id.idiag_sport)
			goto next;
		if (r->id.idiag_dport != htons(assoc->peer.port) &&
		    r->id.idiag_dport)
			goto next;

		if (!cb->args[3] &&
		    inet_sctp_diag_fill(sk, NULL, skb, r,
					sk_user_ns(NETLINK_CB(cb->skb).sk),
					NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq,
					NLM_F_MULTI, cb->nlh,
					commp->net_admin) < 0) {
			err = 1;
			goto release;
		}
		cb->args[3] = 1;

		if (inet_sctp_diag_fill(sk, assoc, skb, r,
					sk_user_ns(NETLINK_CB(cb->skb).sk),
					NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq, 0, cb->nlh,
					commp->net_admin) < 0) {
			err = 1;
			goto release;
		}
next:
		cb->args[4]++;
	}
	cb->args[1] = 0;
	cb->args[3] = 0;
	cb->args[4] = 0;
release:
	release_sock(sk);
	return err;
}

static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
{
	struct sctp_endpoint *ep = tsp->asoc->ep;
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	const struct inet_diag_req_v2 *r = commp->r;
	struct sctp_association *assoc =
		list_entry(ep->asocs.next, struct sctp_association, asocs);

	/* find the ep only once through the transports by this condition */
	if (tsp->asoc != assoc)
		return 0;

	if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
		return 0;

	return 1;
}

static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
{
	struct sctp_comm_param *commp = p;
	struct sock *sk = ep->base.sk;
	struct sk_buff *skb = commp->skb;
	struct netlink_callback *cb = commp->cb;
	const struct inet_diag_req_v2 *r = commp->r;
	struct net *net = sock_net(skb->sk);
	struct inet_sock *inet = inet_sk(sk);
	int err = 0;

	if (!net_eq(sock_net(sk), net))
		goto out;

	if (cb->args[4] < cb->args[1])
		goto next;

	if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
		goto next;

	if (r->sdiag_family != AF_UNSPEC &&
	    sk->sk_family != r->sdiag_family)
		goto next;

	if (r->id.idiag_sport != inet->inet_sport &&
	    r->id.idiag_sport)
		goto next;

	if (r->id.idiag_dport != inet->inet_dport &&
	    r->id.idiag_dport)
		goto next;

	if (inet_sctp_diag_fill(sk, NULL, skb, r,
				sk_user_ns(NETLINK_CB(cb->skb).sk),
				NETLINK_CB(cb->skb).portid,
				cb->nlh->nlmsg_seq, NLM_F_MULTI,
				cb->nlh, commp->net_admin) < 0) {
		err = 2;
		goto out;
	}
next:
	cb->args[4]++;
out:
	return err;
}

/* define the functions for sctp_diag_handler*/
static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
			       void *info)
{
	struct sctp_infox *infox = (struct sctp_infox *)info;

	if (infox->asoc) {
		r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
		r->idiag_wqueue = infox->asoc->sndbuf_used;
	} else {
		r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
		r->idiag_wqueue = sk->sk_max_ack_backlog;
	}
	if (infox->sctpinfo)
		sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
}

static int sctp_diag_dump_one(struct sk_buff *in_skb,
			      const struct nlmsghdr *nlh,
			      const struct inet_diag_req_v2 *req)
{
	struct net *net = sock_net(in_skb->sk);
	union sctp_addr laddr, paddr;
	struct sctp_comm_param commp = {
		.skb = in_skb,
		.r = req,
		.nlh = nlh,
		.net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
	};

	if (req->sdiag_family == AF_INET) {
		laddr.v4.sin_port = req->id.idiag_sport;
		laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
		laddr.v4.sin_family = AF_INET;

		paddr.v4.sin_port = req->id.idiag_dport;
		paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
		paddr.v4.sin_family = AF_INET;
	} else {
		laddr.v6.sin6_port = req->id.idiag_sport;
		memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
		       sizeof(laddr.v6.sin6_addr));
		laddr.v6.sin6_family = AF_INET6;

		paddr.v6.sin6_port = req->id.idiag_dport;
		memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
		       sizeof(paddr.v6.sin6_addr));
		paddr.v6.sin6_family = AF_INET6;
	}

	return sctp_transport_lookup_process(sctp_tsp_dump_one,
					     net, &laddr, &paddr, &commp);
}

static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
			   const struct inet_diag_req_v2 *r, struct nlattr *bc)
{
	u32 idiag_states = r->idiag_states;
	struct net *net = sock_net(skb->sk);
	struct sctp_comm_param commp = {
		.skb = skb,
		.cb = cb,
		.r = r,
		.net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
	};
	int pos = cb->args[2];

	/* eps hashtable dumps
	 * args:
	 * 0 : if it will traversal listen sock
	 * 1 : to record the sock pos of this time's traversal
	 * 4 : to work as a temporary variable to traversal list
	 */
	if (cb->args[0] == 0) {
		if (!(idiag_states & TCPF_LISTEN))
			goto skip;
		if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
			goto done;
skip:
		cb->args[0] = 1;
		cb->args[1] = 0;
		cb->args[4] = 0;
	}

	/* asocs by transport hashtable dump
	 * args:
	 * 1 : to record the assoc pos of this time's traversal
	 * 2 : to record the transport pos of this time's traversal
	 * 3 : to mark if we have dumped the ep info of the current asoc
	 * 4 : to work as a temporary variable to traversal list
	 * 5 : to save the sk we get from travelsing the tsp list.
	 */
	if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
		goto done;

	sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
				net, &pos, &commp);
	cb->args[2] = pos;

done:
	cb->args[1] = cb->args[4];
	cb->args[4] = 0;
}

static const struct inet_diag_handler sctp_diag_handler = {
	.dump		 = sctp_diag_dump,
	.dump_one	 = sctp_diag_dump_one,
	.idiag_get_info  = sctp_diag_get_info,
	.idiag_type	 = IPPROTO_SCTP,
	.idiag_info_size = sizeof(struct sctp_info),
};

static int __init sctp_diag_init(void)
{
	return inet_diag_register(&sctp_diag_handler);
}

static void __exit sctp_diag_exit(void)
{
	inet_diag_unregister(&sctp_diag_handler);
}

module_init(sctp_diag_init);
module_exit(sctp_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
Commit	Line	Data
47505b8b	1	// SPDX-License-Identifier: GPL-2.0-or-later
6f68dc99 XL	2	/* SCTP kernel implementation
	3	* (C) Copyright Red Hat Inc. 2017
	4	*
	5	* This file is part of the SCTP kernel implementation
	6	*
	7	* These functions implement sctp diag support.
	8	*
6f68dc99 XL	9	* Please send any bug reports or fixes you make to the
	10	* email addresched(es):
	11	* lksctp developers <[email protected]>
	12	*
	13	* Written or modified by:
	14	* Xin Long <[email protected]>
	15	*/
	16
8f840e47 XL	17	#include <linux/module.h>
	18	#include <linux/inet_diag.h>
	19	#include <linux/sock_diag.h>
	20	#include <net/sctp/sctp.h>
	21
8f840e47 XL	22	static void sctp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	23	void *info);
	24
	25	/* define some functions to make asoc/ep fill look clean */
	26	static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
	27	struct sock *sk,
	28	struct sctp_association *asoc)
	29	{
	30	union sctp_addr laddr, paddr;
	31	struct dst_entry *dst;
12474e8e	32	struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
8f840e47 XL	33
	34	laddr = list_entry(asoc->base.bind_addr.address_list.next,
	35	struct sctp_sockaddr_entry, list)->a;
	36	paddr = asoc->peer.primary_path->ipaddr;
	37	dst = asoc->peer.primary_path->dst;
	38
	39	r->idiag_family = sk->sk_family;
	40	r->id.idiag_sport = htons(asoc->base.bind_addr.port);
	41	r->id.idiag_dport = htons(asoc->peer.port);
	42	r->id.idiag_if = dst ? dst->dev->ifindex : 0;
	43	sock_diag_save_cookie(sk, r->id.idiag_cookie);
	44
	45	#if IS_ENABLED(CONFIG_IPV6)
	46	if (sk->sk_family == AF_INET6) {
	47	(struct in6_addr )r->id.idiag_src = laddr.v6.sin6_addr;
	48	(struct in6_addr )r->id.idiag_dst = paddr.v6.sin6_addr;
	49	} else
	50	#endif
	51	{
	52	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
	53	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
	54
	55	r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
	56	r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
	57	}
	58
	59	r->idiag_state = asoc->state;
12474e8e PS	60	if (timer_pending(t3_rtx)) {
	61	r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
	62	r->idiag_retrans = asoc->rtx_data_chunks;
	63	r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
	64	} else {
	65	r->idiag_timer = 0;
	66	r->idiag_retrans = 0;
	67	r->idiag_expires = 0;
	68	}
8f840e47 XL	69	}
	70
	71	static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
	72	struct list_head *address_list)
	73	{
	74	struct sctp_sockaddr_entry *laddr;
	75	int addrlen = sizeof(struct sockaddr_storage);
	76	int addrcnt = 0;
	77	struct nlattr *attr;
	78	void *info = NULL;
	79
	80	list_for_each_entry_rcu(laddr, address_list, list)
	81	addrcnt++;
	82
	83	attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
	84	if (!attr)
	85	return -EMSGSIZE;
	86
	87	info = nla_data(attr);
	88	list_for_each_entry_rcu(laddr, address_list, list) {
ee6c88bb SB	89	memcpy(info, &laddr->a, sizeof(laddr->a));
ee6c88bb SB	90	memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
8f840e47 XL	91	info += addrlen;
	92	}
	93
	94	return 0;
	95	}
	96
	97	static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
	98	struct sctp_association *asoc)
	99	{
	100	int addrlen = sizeof(struct sockaddr_storage);
	101	struct sctp_transport *from;
	102	struct nlattr *attr;
	103	void *info = NULL;
	104
	105	attr = nla_reserve(skb, INET_DIAG_PEERS,
	106	addrlen * asoc->peer.transport_count);
	107	if (!attr)
	108	return -EMSGSIZE;
	109
	110	info = nla_data(attr);
	111	list_for_each_entry(from, &asoc->peer.transport_addr_list,
	112	transports) {
ee6c88bb SB	113	memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
	114	memset(info + sizeof(from->ipaddr), 0,
	115	addrlen - sizeof(from->ipaddr));
8f840e47 XL	116	info += addrlen;
	117	}
	118
	119	return 0;
	120	}
	121
	122	/* sctp asoc/ep fill*/
	123	static int inet_sctp_diag_fill(struct sock sk, struct sctp_association asoc,
	124	struct sk_buff *skb,
	125	const struct inet_diag_req_v2 *req,
	126	struct user_namespace *user_ns,
	127	int portid, u32 seq, u16 nlmsg_flags,
d545caca LC	128	const struct nlmsghdr *unlh,
d545caca LC	129	bool net_admin)
8f840e47 XL	130	{
	131	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	132	struct list_head *addr_list;
	133	struct inet_diag_msg *r;
	134	struct nlmsghdr *nlh;
	135	int ext = req->idiag_ext;
	136	struct sctp_infox infox;
	137	void *info = NULL;
	138
	139	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
	140	nlmsg_flags);
	141	if (!nlh)
	142	return -EMSGSIZE;
	143
	144	r = nlmsg_data(nlh);
	145	BUG_ON(!sk_fullsock(sk));
	146
	147	if (asoc) {
	148	inet_diag_msg_sctpasoc_fill(r, sk, asoc);
	149	} else {
	150	inet_diag_msg_common_fill(r, sk);
	151	r->idiag_state = sk->sk_state;
	152	r->idiag_timer = 0;
	153	r->idiag_retrans = 0;
	154	}
	155
d545caca	156	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
8f840e47 XL	157	goto errout;
	158
	159	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
	160	u32 mem[SK_MEMINFO_VARS];
	161	int amt;
	162
	163	if (asoc && asoc->ep->sndbuf_policy)
	164	amt = asoc->sndbuf_used;
	165	else
	166	amt = sk_wmem_alloc_get(sk);
	167	mem[SK_MEMINFO_WMEM_ALLOC] = amt;
f052f20a XL	168	if (asoc && asoc->ep->rcvbuf_policy)
	169	amt = atomic_read(&asoc->rmem_alloc);
	170	else
	171	amt = sk_rmem_alloc_get(sk);
	172	mem[SK_MEMINFO_RMEM_ALLOC] = amt;
8f840e47 XL	173	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	174	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	175	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	176	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	177	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
70c26558	178	mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
8f840e47 XL	179	mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
	180
	181	if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
	182	goto errout;
	183	}
	184
	185	if (ext & (1 << (INET_DIAG_INFO - 1))) {
	186	struct nlattr *attr;
	187
6ed46d12 ND	188	attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
	189	sizeof(struct sctp_info),
	190	INET_DIAG_PAD);
8f840e47 XL	191	if (!attr)
	192	goto errout;
	193
	194	info = nla_data(attr);
	195	}
	196	infox.sctpinfo = (struct sctp_info *)info;
	197	infox.asoc = asoc;
	198	sctp_diag_get_info(sk, r, &infox);
	199
	200	addr_list = asoc ? &asoc->base.bind_addr.address_list
	201	: &ep->base.bind_addr.address_list;
	202	if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
	203	goto errout;
	204
	205	if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
	206	if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
	207	goto errout;
	208
	209	if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
	210	goto errout;
	211
	212	nlmsg_end(skb, nlh);
	213	return 0;
	214
	215	errout:
	216	nlmsg_cancel(skb, nlh);
	217	return -EMSGSIZE;
	218	}
	219
	220	/* callback and param */
	221	struct sctp_comm_param {
	222	struct sk_buff *skb;
	223	struct netlink_callback *cb;
	224	const struct inet_diag_req_v2 *r;
	225	const struct nlmsghdr *nlh;
d545caca	226	bool net_admin;
8f840e47 XL	227	};
	228
	229	static size_t inet_assoc_attr_size(struct sctp_association *asoc)
	230	{
	231	int addrlen = sizeof(struct sockaddr_storage);
	232	int addrcnt = 0;
	233	struct sctp_sockaddr_entry *laddr;
	234
	235	list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
	236	list)
	237	addrcnt++;
	238
	239	return nla_total_size(sizeof(struct sctp_info))
	240	+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
	241	+ nla_total_size(1) /* INET_DIAG_TOS */
	242	+ nla_total_size(1) /* INET_DIAG_TCLASS */
d545caca	243	+ nla_total_size(4) /* INET_DIAG_MARK */
1ec17dbd	244	+ nla_total_size(4) /* INET_DIAG_CLASS_ID */
8f840e47 XL	245	+ nla_total_size(addrlen * asoc->peer.transport_count)
	246	+ nla_total_size(addrlen * addrcnt)
	247	+ nla_total_size(sizeof(struct inet_diag_meminfo))
	248	+ nla_total_size(sizeof(struct inet_diag_msg))
	249	+ 64;
	250	}
	251
	252	static int sctp_tsp_dump_one(struct sctp_transport tsp, void p)
	253	{
	254	struct sctp_association *assoc = tsp->asoc;
	255	struct sock *sk = tsp->asoc->base.sk;
	256	struct sctp_comm_param *commp = p;
	257	struct sk_buff *in_skb = commp->skb;
	258	const struct inet_diag_req_v2 *req = commp->r;
	259	const struct nlmsghdr *nlh = commp->nlh;
	260	struct net *net = sock_net(in_skb->sk);
	261	struct sk_buff *rep;
	262	int err;
	263
	264	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
	265	if (err)
	266	goto out;
	267
	268	err = -ENOMEM;
	269	rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
	270	if (!rep)
	271	goto out;
	272
	273	lock_sock(sk);
	274	if (sk != assoc->base.sk) {
	275	release_sock(sk);
	276	sk = assoc->base.sk;
	277	lock_sock(sk);
	278	}
	279	err = inet_sctp_diag_fill(sk, assoc, rep, req,
	280	sk_user_ns(NETLINK_CB(in_skb).sk),
	281	NETLINK_CB(in_skb).portid,
d545caca LC	282	nlh->nlmsg_seq, 0, nlh,
d545caca LC	283	commp->net_admin);
8f840e47 XL	284	release_sock(sk);
	285	if (err < 0) {
	286	WARN_ON(err == -EMSGSIZE);
	287	kfree_skb(rep);
	288	goto out;
	289	}
	290
	291	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
	292	MSG_DONTWAIT);
	293	if (err > 0)
	294	err = 0;
	295	out:
	296	return err;
	297	}
	298
d25adbeb	299	static int sctp_sock_dump(struct sctp_transport tsp, void p)
8f840e47	300	{
d25adbeb	301	struct sctp_endpoint *ep = tsp->asoc->ep;
8f840e47	302	struct sctp_comm_param *commp = p;
d25adbeb	303	struct sock *sk = ep->base.sk;
8f840e47 XL	304	struct sk_buff *skb = commp->skb;
	305	struct netlink_callback *cb = commp->cb;
	306	const struct inet_diag_req_v2 *r = commp->r;
1cceda78	307	struct sctp_association *assoc;
8f840e47 XL	308	int err = 0;
8f840e47 XL	309
8f840e47	310	lock_sock(sk);
d25adbeb	311	list_for_each_entry(assoc, &ep->asocs, asocs) {
8f840e47 XL	312	if (cb->args[4] < cb->args[1])
	313	goto next;
	314
	315	if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
	316	r->id.idiag_sport)
	317	goto next;
	318	if (r->id.idiag_dport != htons(assoc->peer.port) &&
	319	r->id.idiag_dport)
	320	goto next;
	321
	322	if (!cb->args[3] &&
	323	inet_sctp_diag_fill(sk, NULL, skb, r,
	324	sk_user_ns(NETLINK_CB(cb->skb).sk),
	325	NETLINK_CB(cb->skb).portid,
	326	cb->nlh->nlmsg_seq,
d545caca LC	327	NLM_F_MULTI, cb->nlh,
d545caca LC	328	commp->net_admin) < 0) {
1cceda78	329	err = 1;
8f840e47 XL	330	goto release;
	331	}
	332	cb->args[3] = 1;
	333
	334	if (inet_sctp_diag_fill(sk, assoc, skb, r,
	335	sk_user_ns(NETLINK_CB(cb->skb).sk),
	336	NETLINK_CB(cb->skb).portid,
d545caca LC	337	cb->nlh->nlmsg_seq, 0, cb->nlh,
d545caca LC	338	commp->net_admin) < 0) {
1cceda78	339	err = 1;
8f840e47 XL	340	goto release;
	341	}
	342	next:
	343	cb->args[4]++;
	344	}
	345	cb->args[1] = 0;
8f840e47 XL	346	cb->args[3] = 0;
	347	cb->args[4] = 0;
	348	release:
	349	release_sock(sk);
	350	return err;
1cceda78 XL	351	}
1cceda78 XL	352
d25adbeb	353	static int sctp_sock_filter(struct sctp_transport tsp, void p)
1cceda78 XL	354	{
	355	struct sctp_endpoint *ep = tsp->asoc->ep;
	356	struct sctp_comm_param *commp = p;
	357	struct sock *sk = ep->base.sk;
1cceda78 XL	358	const struct inet_diag_req_v2 *r = commp->r;
	359	struct sctp_association *assoc =
	360	list_entry(ep->asocs.next, struct sctp_association, asocs);
	361
	362	/* find the ep only once through the transports by this condition */
	363	if (tsp->asoc != assoc)
d25adbeb	364	return 0;
1cceda78 XL	365
1cceda78 XL	366	if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
d25adbeb	367	return 0;
1cceda78 XL	368
1cceda78 XL	369	return 1;
8f840e47 XL	370	}
	371
	372	static int sctp_ep_dump(struct sctp_endpoint ep, void p)
	373	{
	374	struct sctp_comm_param *commp = p;
	375	struct sock *sk = ep->base.sk;
	376	struct sk_buff *skb = commp->skb;
	377	struct netlink_callback *cb = commp->cb;
	378	const struct inet_diag_req_v2 *r = commp->r;
	379	struct net *net = sock_net(skb->sk);
	380	struct inet_sock *inet = inet_sk(sk);
	381	int err = 0;
	382
	383	if (!net_eq(sock_net(sk), net))
	384	goto out;
	385
	386	if (cb->args[4] < cb->args[1])
	387	goto next;
	388
1ba8d77f	389	if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
bed187b5 XL	390	goto next;
bed187b5 XL	391
8f840e47 XL	392	if (r->sdiag_family != AF_UNSPEC &&
	393	sk->sk_family != r->sdiag_family)
	394	goto next;
	395
	396	if (r->id.idiag_sport != inet->inet_sport &&
	397	r->id.idiag_sport)
	398	goto next;
	399
	400	if (r->id.idiag_dport != inet->inet_dport &&
	401	r->id.idiag_dport)
	402	goto next;
	403
	404	if (inet_sctp_diag_fill(sk, NULL, skb, r,
	405	sk_user_ns(NETLINK_CB(cb->skb).sk),
	406	NETLINK_CB(cb->skb).portid,
	407	cb->nlh->nlmsg_seq, NLM_F_MULTI,
d545caca	408	cb->nlh, commp->net_admin) < 0) {
8f840e47 XL	409	err = 2;
	410	goto out;
	411	}
	412	next:
	413	cb->args[4]++;
	414	out:
	415	return err;
	416	}
	417
	418	/* define the functions for sctp_diag_handler*/
	419	static void sctp_diag_get_info(struct sock sk, struct inet_diag_msg r,
	420	void *info)
	421	{
	422	struct sctp_infox infox = (struct sctp_infox )info;
	423
	424	if (infox->asoc) {
	425	r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
	426	r->idiag_wqueue = infox->asoc->sndbuf_used;
	427	} else {
288efe86	428	r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
8f840e47 XL	429	r->idiag_wqueue = sk->sk_max_ack_backlog;
	430	}
	431	if (infox->sctpinfo)
	432	sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
	433	}
	434
	435	static int sctp_diag_dump_one(struct sk_buff *in_skb,
	436	const struct nlmsghdr *nlh,
	437	const struct inet_diag_req_v2 *req)
	438	{
	439	struct net *net = sock_net(in_skb->sk);
	440	union sctp_addr laddr, paddr;
	441	struct sctp_comm_param commp = {
	442	.skb = in_skb,
	443	.r = req,
	444	.nlh = nlh,
d545caca	445	.net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
8f840e47 XL	446	};
	447
	448	if (req->sdiag_family == AF_INET) {
	449	laddr.v4.sin_port = req->id.idiag_sport;
	450	laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
	451	laddr.v4.sin_family = AF_INET;
	452
	453	paddr.v4.sin_port = req->id.idiag_dport;
	454	paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
	455	paddr.v4.sin_family = AF_INET;
	456	} else {
	457	laddr.v6.sin6_port = req->id.idiag_sport;
232cb53a LR	458	memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
232cb53a LR	459	sizeof(laddr.v6.sin6_addr));
8f840e47 XL	460	laddr.v6.sin6_family = AF_INET6;
	461
	462	paddr.v6.sin6_port = req->id.idiag_dport;
232cb53a LR	463	memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
232cb53a LR	464	sizeof(paddr.v6.sin6_addr));
8f840e47 XL	465	paddr.v6.sin6_family = AF_INET6;
	466	}
	467
	468	return sctp_transport_lookup_process(sctp_tsp_dump_one,
	469	net, &laddr, &paddr, &commp);
	470	}
	471
	472	static void sctp_diag_dump(struct sk_buff skb, struct netlink_callback cb,
	473	const struct inet_diag_req_v2 r, struct nlattr bc)
	474	{
	475	u32 idiag_states = r->idiag_states;
	476	struct net *net = sock_net(skb->sk);
	477	struct sctp_comm_param commp = {
	478	.skb = skb,
	479	.cb = cb,
	480	.r = r,
d545caca	481	.net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
8f840e47	482	};
c2cc187e	483	int pos = cb->args[2];
8f840e47 XL	484
	485	/* eps hashtable dumps
	486	* args:
	487	* 0 : if it will traversal listen sock
	488	* 1 : to record the sock pos of this time's traversal
	489	* 4 : to work as a temporary variable to traversal list
	490	*/
	491	if (cb->args[0] == 0) {
	492	if (!(idiag_states & TCPF_LISTEN))
	493	goto skip;
	494	if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
	495	goto done;
	496	skip:
	497	cb->args[0] = 1;
	498	cb->args[1] = 0;
	499	cb->args[4] = 0;
	500	}
	501
	502	/* asocs by transport hashtable dump
	503	* args:
	504	* 1 : to record the assoc pos of this time's traversal
	505	* 2 : to record the transport pos of this time's traversal
	506	* 3 : to mark if we have dumped the ep info of the current asoc
	507	* 4 : to work as a temporary variable to traversal list
1cceda78	508	* 5 : to save the sk we get from travelsing the tsp list.
8f840e47	509	*/
1ba8d77f	510	if (!(idiag_states & ~(TCPF_LISTEN \| TCPF_CLOSE)))
8f840e47	511	goto done;
1cceda78	512
d25adbeb	513	sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
c2cc187e DC	514	net, &pos, &commp);
c2cc187e DC	515	cb->args[2] = pos;
1cceda78	516
8f840e47 XL	517	done:
	518	cb->args[1] = cb->args[4];
	519	cb->args[4] = 0;
	520	}
	521
	522	static const struct inet_diag_handler sctp_diag_handler = {
	523	.dump = sctp_diag_dump,
	524	.dump_one = sctp_diag_dump_one,
	525	.idiag_get_info = sctp_diag_get_info,
	526	.idiag_type = IPPROTO_SCTP,
	527	.idiag_info_size = sizeof(struct sctp_info),
	528	};
	529
	530	static int __init sctp_diag_init(void)
	531	{
	532	return inet_diag_register(&sctp_diag_handler);
	533	}
	534
	535	static void __exit sctp_diag_exit(void)
	536	{
	537	inet_diag_unregister(&sctp_diag_handler);
	538	}
	539
	540	module_init(sctp_diag_init);
	541	module_exit(sctp_diag_exit);
	542	MODULE_LICENSE("GPL");
	543	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);