Message-Id: <0b9abe0b402eaa4c5c71a3d165669814f1789cee.1518431550.git.lucien.xin@gmail.com>
Date:   Mon, 12 Feb 2018 18:32:30 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     davem@...emloft.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>
Subject: [PATCH net] sctp: rename sctp_diag.c as diag.c

Remove sctp_ prefix for diag file, to keep consistent with other
files' names, while at it, also to add file comments for diag.c.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/sctp/Makefile    |   2 +
 net/sctp/diag.c      | 557 +++++++++++++++++++++++++++++++++++++++++++++++++++
 net/sctp/sctp_diag.c | 526 ------------------------------------------------
 3 files changed, 559 insertions(+), 526 deletions(-)
 create mode 100644 net/sctp/diag.c
 delete mode 100644 net/sctp/sctp_diag.c

diff --git a/net/sctp/Makefile b/net/sctp/Makefile
index 6776582..e845e45 100644
--- a/net/sctp/Makefile
+++ b/net/sctp/Makefile
@@ -15,6 +15,8 @@ sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
 	  offload.o stream_sched.o stream_sched_prio.o \
 	  stream_sched_rr.o stream_interleave.o
 
+sctp_diag-y := diag.o
+
 sctp-$(CONFIG_SCTP_DBG_OBJCNT) += objcnt.o
 sctp-$(CONFIG_PROC_FS) += proc.o
 sctp-$(CONFIG_SYSCTL) += sysctl.o
diff --git a/net/sctp/diag.c b/net/sctp/diag.c
new file mode 100644
index 0000000..078f01a
--- /dev/null
+++ b/net/sctp/diag.c
@@ -0,0 +1,557 @@
+/* SCTP kernel implementation
+ * (C) Copyright Red Hat Inc. 2017
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * These functions implement sctp diag support.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresched(es):
+ *    lksctp developers <linux-sctp@...r.kernel.org>
+ *
+ * Written or modified by:
+ *    Xin Long <lucien.xin@...il.com>
+ */
+
+#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] = 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 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 = 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);
diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c
deleted file mode 100644
index a72a7d9..0000000
--- a/net/sctp/sctp_diag.c
+++ /dev/null
@@ -1,526 +0,0 @@
-#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] = 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 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 = 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);
-- 
2.1.0

Powered by blists - more mailing lists