[mirror_ubuntu-bionic-kernel.git] / net / sctp / sctp_diag.c

#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, addrlen);
		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, addrlen);
		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] = 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(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 sock *sk, void *p)
{
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	struct sctp_comm_param *commp = p;
	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) {
			cb->args[3] = 1;
			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[2]++;
	cb->args[3] = 0;
	cb->args[4] = 0;
release:
	release_sock(sk);
	sock_put(sk);
	return err;
}

static int sctp_get_sock(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 netlink_callback *cb = commp->cb;
	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)
		goto out;

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

	sock_hold(sk);
	cb->args[5] = (long)sk;

	return 1;

out:
	cb->args[2]++;
	return 0;
}

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 = 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),
	};

	/* 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;

next:
	cb->args[5] = 0;
	sctp_for_each_transport(sctp_get_sock, net, cb->args[2], &commp);

	if (cb->args[5] && !sctp_sock_dump((struct sock *)cb->args[5], &commp))
		goto next;

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