--- /dev/null
+/*
+ * net/tipc/msg.h: Include file for TIPC message header routines
+ *
+ * Copyright (c) 2000-2007, 2014-2015 Ericsson AB
+ * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _TIPC_MSG_H
+#define _TIPC_MSG_H
+
+#include <linux/tipc.h>
+
+/*
+ * Constants and routines used to read and write TIPC payload message headers
+ *
+ * Note: Some items are also used with TIPC internal message headers
+ */
+#define TIPC_VERSION 2
+struct plist;
+
+/*
+ * Payload message users are defined in TIPC's public API:
+ * - TIPC_LOW_IMPORTANCE
+ * - TIPC_MEDIUM_IMPORTANCE
+ * - TIPC_HIGH_IMPORTANCE
+ * - TIPC_CRITICAL_IMPORTANCE
+ */
+#define TIPC_SYSTEM_IMPORTANCE 4
+
+
+/*
+ * Payload message types
+ */
+#define TIPC_CONN_MSG 0
+#define TIPC_MCAST_MSG 1
+#define TIPC_NAMED_MSG 2
+#define TIPC_DIRECT_MSG 3
+
+/*
+ * Internal message users
+ */
+#define BCAST_PROTOCOL 5
+#define MSG_BUNDLER 6
+#define LINK_PROTOCOL 7
+#define CONN_MANAGER 8
+#define TUNNEL_PROTOCOL 10
+#define NAME_DISTRIBUTOR 11
+#define MSG_FRAGMENTER 12
+#define LINK_CONFIG 13
+#define SOCK_WAKEUP 14 /* pseudo user */
+
+/*
+ * Message header sizes
+ */
+#define SHORT_H_SIZE 24 /* In-cluster basic payload message */
+#define BASIC_H_SIZE 32 /* Basic payload message */
+#define NAMED_H_SIZE 40 /* Named payload message */
+#define MCAST_H_SIZE 44 /* Multicast payload message */
+#define INT_H_SIZE 40 /* Internal messages */
+#define MIN_H_SIZE 24 /* Smallest legal TIPC header size */
+#define MAX_H_SIZE 60 /* Largest possible TIPC header size */
+
+#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
+
+#define TIPC_MEDIA_INFO_OFFSET 5
+
+/**
+ * TIPC message buffer code
+ *
+ * TIPC message buffer headroom reserves space for the worst-case
+ * link-level device header (in case the message is sent off-node).
+ *
+ * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields
+ * are word aligned for quicker access
+ */
+#define BUF_HEADROOM (LL_MAX_HEADER + 48)
+
+struct tipc_skb_cb {
+ void *handle;
+ struct sk_buff *tail;
+ bool validated;
+ bool wakeup_pending;
+ bool bundling;
+ u16 chain_sz;
+ u16 chain_imp;
+};
+
+#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
+
+struct tipc_msg {
+ __be32 hdr[15];
+};
+
+static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
+{
+ return (struct tipc_msg *)skb->data;
+}
+
+static inline u32 msg_word(struct tipc_msg *m, u32 pos)
+{
+ return ntohl(m->hdr[pos]);
+}
+
+static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
+{
+ m->hdr[w] = htonl(val);
+}
+
+static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
+{
+ return (msg_word(m, w) >> pos) & mask;
+}
+
+static inline void msg_set_bits(struct tipc_msg *m, u32 w,
+ u32 pos, u32 mask, u32 val)
+{
+ val = (val & mask) << pos;
+ mask = mask << pos;
+ m->hdr[w] &= ~htonl(mask);
+ m->hdr[w] |= htonl(val);
+}
+
+static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
+{
+ u32 temp = msg->hdr[a];
+
+ msg->hdr[a] = msg->hdr[b];
+ msg->hdr[b] = temp;
+}
+
+/*
+ * Word 0
+ */
+static inline u32 msg_version(struct tipc_msg *m)
+{
+ return msg_bits(m, 0, 29, 7);
+}
+
+static inline void msg_set_version(struct tipc_msg *m)
+{
+ msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
+}
+
+static inline u32 msg_user(struct tipc_msg *m)
+{
+ return msg_bits(m, 0, 25, 0xf);
+}
+
+static inline u32 msg_isdata(struct tipc_msg *m)
+{
+ return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
+}
+
+static inline void msg_set_user(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 0, 25, 0xf, n);
+}
+
+static inline u32 msg_hdr_sz(struct tipc_msg *m)
+{
+ return msg_bits(m, 0, 21, 0xf) << 2;
+}
+
+static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 0, 21, 0xf, n>>2);
+}
+
+static inline u32 msg_size(struct tipc_msg *m)
+{
+ return msg_bits(m, 0, 0, 0x1ffff);
+}
+
+static inline u32 msg_data_sz(struct tipc_msg *m)
+{
+ return msg_size(m) - msg_hdr_sz(m);
+}
+
+static inline int msg_non_seq(struct tipc_msg *m)
+{
+ return msg_bits(m, 0, 20, 1);
+}
+
+static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 0, 20, 1, n);
+}
+
+static inline int msg_dest_droppable(struct tipc_msg *m)
+{
+ return msg_bits(m, 0, 19, 1);
+}
+
+static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
+{
+ msg_set_bits(m, 0, 19, 1, d);
+}
+
+static inline int msg_src_droppable(struct tipc_msg *m)
+{
+ return msg_bits(m, 0, 18, 1);
+}
+
+static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
+{
+ msg_set_bits(m, 0, 18, 1, d);
+}
+
+static inline void msg_set_size(struct tipc_msg *m, u32 sz)
+{
+ m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
+}
+
+static inline unchar *msg_data(struct tipc_msg *m)
+{
+ return ((unchar *)m) + msg_hdr_sz(m);
+}
+
+static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
+{
+ return (struct tipc_msg *)msg_data(m);
+}
+
+/*
+ * Word 1
+ */
+static inline u32 msg_type(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 29, 0x7);
+}
+
+static inline void msg_set_type(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 1, 29, 0x7, n);
+}
+
+static inline u32 msg_named(struct tipc_msg *m)
+{
+ return msg_type(m) == TIPC_NAMED_MSG;
+}
+
+static inline u32 msg_mcast(struct tipc_msg *m)
+{
+ return msg_type(m) == TIPC_MCAST_MSG;
+}
+
+static inline u32 msg_connected(struct tipc_msg *m)
+{
+ return msg_type(m) == TIPC_CONN_MSG;
+}
+
+static inline u32 msg_errcode(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 25, 0xf);
+}
+
+static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
+{
+ msg_set_bits(m, 1, 25, 0xf, err);
+}
+
+static inline u32 msg_reroute_cnt(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 21, 0xf);
+}
+
+static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
+{
+ msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
+}
+
+static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
+{
+ msg_set_bits(m, 1, 21, 0xf, 0);
+}
+
+static inline u32 msg_lookup_scope(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 19, 0x3);
+}
+
+static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 1, 19, 0x3, n);
+}
+
+static inline u32 msg_bcast_ack(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 0, 0xffff);
+}
+
+static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 1, 0, 0xffff, n);
+}
+
+
+/*
+ * Word 2
+ */
+static inline u32 msg_ack(struct tipc_msg *m)
+{
+ return msg_bits(m, 2, 16, 0xffff);
+}
+
+static inline void msg_set_ack(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 2, 16, 0xffff, n);
+}
+
+static inline u32 msg_seqno(struct tipc_msg *m)
+{
+ return msg_bits(m, 2, 0, 0xffff);
+}
+
+static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 2, 0, 0xffff, n);
+}
+
+/*
+ * Words 3-10
+ */
+static inline u32 msg_importance(struct tipc_msg *m)
+{
+ if (unlikely(msg_user(m) == MSG_FRAGMENTER))
+ return msg_bits(m, 5, 13, 0x7);
+ if (likely(msg_isdata(m) && !msg_errcode(m)))
+ return msg_user(m);
+ return TIPC_SYSTEM_IMPORTANCE;
+}
+
+static inline void msg_set_importance(struct tipc_msg *m, u32 i)
+{
+ if (unlikely(msg_user(m) == MSG_FRAGMENTER))
+ msg_set_bits(m, 5, 13, 0x7, i);
+ else if (likely(i < TIPC_SYSTEM_IMPORTANCE))
+ msg_set_user(m, i);
+ else
+ pr_warn("Trying to set illegal importance in message\n");
+}
+
+static inline u32 msg_prevnode(struct tipc_msg *m)
+{
+ return msg_word(m, 3);
+}
+
+static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
+{
+ msg_set_word(m, 3, a);
+}
+
+static inline u32 msg_origport(struct tipc_msg *m)
+{
+ if (msg_user(m) == MSG_FRAGMENTER)
+ m = msg_get_wrapped(m);
+ return msg_word(m, 4);
+}
+
+static inline void msg_set_origport(struct tipc_msg *m, u32 p)
+{
+ msg_set_word(m, 4, p);
+}
+
+static inline u32 msg_destport(struct tipc_msg *m)
+{
+ return msg_word(m, 5);
+}
+
+static inline void msg_set_destport(struct tipc_msg *m, u32 p)
+{
+ msg_set_word(m, 5, p);
+}
+
+static inline u32 msg_mc_netid(struct tipc_msg *m)
+{
+ return msg_word(m, 5);
+}
+
+static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
+{
+ msg_set_word(m, 5, p);
+}
+
+static inline int msg_short(struct tipc_msg *m)
+{
+ return msg_hdr_sz(m) == SHORT_H_SIZE;
+}
+
+static inline u32 msg_orignode(struct tipc_msg *m)
+{
+ if (likely(msg_short(m)))
+ return msg_prevnode(m);
+ return msg_word(m, 6);
+}
+
+static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
+{
+ msg_set_word(m, 6, a);
+}
+
+static inline u32 msg_destnode(struct tipc_msg *m)
+{
+ return msg_word(m, 7);
+}
+
+static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
+{
+ msg_set_word(m, 7, a);
+}
+
+static inline u32 msg_nametype(struct tipc_msg *m)
+{
+ return msg_word(m, 8);
+}
+
+static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
+{
+ msg_set_word(m, 8, n);
+}
+
+static inline u32 msg_nameinst(struct tipc_msg *m)
+{
+ return msg_word(m, 9);
+}
+
+static inline u32 msg_namelower(struct tipc_msg *m)
+{
+ return msg_nameinst(m);
+}
+
+static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
+{
+ msg_set_word(m, 9, n);
+}
+
+static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
+{
+ msg_set_namelower(m, n);
+}
+
+static inline u32 msg_nameupper(struct tipc_msg *m)
+{
+ return msg_word(m, 10);
+}
+
+static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
+{
+ msg_set_word(m, 10, n);
+}
+
+/*
+ * Constants and routines used to read and write TIPC internal message headers
+ */
+
+/*
+ * Connection management protocol message types
+ */
+#define CONN_PROBE 0
+#define CONN_PROBE_REPLY 1
+#define CONN_ACK 2
+
+/*
+ * Name distributor message types
+ */
+#define PUBLICATION 0
+#define WITHDRAWAL 1
+
+/*
+ * Segmentation message types
+ */
+#define FIRST_FRAGMENT 0
+#define FRAGMENT 1
+#define LAST_FRAGMENT 2
+
+/*
+ * Link management protocol message types
+ */
+#define STATE_MSG 0
+#define RESET_MSG 1
+#define ACTIVATE_MSG 2
+
+/*
+ * Changeover tunnel message types
+ */
+#define SYNCH_MSG 0
+#define FAILOVER_MSG 1
+
+/*
+ * Config protocol message types
+ */
+#define DSC_REQ_MSG 0
+#define DSC_RESP_MSG 1
+
+/*
+ * Word 1
+ */
+static inline u32 msg_seq_gap(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 16, 0x1fff);
+}
+
+static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 1, 16, 0x1fff, n);
+}
+
+static inline u32 msg_node_sig(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 0, 0xffff);
+}
+
+static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 1, 0, 0xffff, n);
+}
+
+static inline u32 msg_node_capabilities(struct tipc_msg *m)
+{
+ return msg_bits(m, 1, 15, 0x1fff);
+}
+
+static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 1, 15, 0x1fff, n);
+}
+
+static inline bool msg_dup(struct tipc_msg *m)
+{
+ if (likely(msg_user(m) != TUNNEL_PROTOCOL))
+ return false;
+ if (msg_type(m) != SYNCH_MSG)
+ return false;
+ return true;
+}
+
+/*
+ * Word 2
+ */
+static inline u32 msg_dest_domain(struct tipc_msg *m)
+{
+ return msg_word(m, 2);
+}
+
+static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
+{
+ msg_set_word(m, 2, n);
+}
+
+static inline u32 msg_bcgap_after(struct tipc_msg *m)
+{
+ return msg_bits(m, 2, 16, 0xffff);
+}
+
+static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 2, 16, 0xffff, n);
+}
+
+static inline u32 msg_bcgap_to(struct tipc_msg *m)
+{
+ return msg_bits(m, 2, 0, 0xffff);
+}
+
+static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 2, 0, 0xffff, n);
+}
+
+
+/*
+ * Word 4
+ */
+static inline u32 msg_last_bcast(struct tipc_msg *m)
+{
+ return msg_bits(m, 4, 16, 0xffff);
+}
+
+static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 4, 16, 0xffff, n);
+}
+
+static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 4, 16, 0xffff, n);
+}
+
+
+static inline u32 msg_next_sent(struct tipc_msg *m)
+{
+ return msg_bits(m, 4, 0, 0xffff);
+}
+
+static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 4, 0, 0xffff, n);
+}
+
+static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 4, 0, 0xffff, n);
+}
+
+static inline u32 msg_bc_netid(struct tipc_msg *m)
+{
+ return msg_word(m, 4);
+}
+
+static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
+{
+ msg_set_word(m, 4, id);
+}
+
+static inline u32 msg_link_selector(struct tipc_msg *m)
+{
+ return msg_bits(m, 4, 0, 1);
+}
+
+static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 4, 0, 1, n);
+}
+
+/*
+ * Word 5
+ */
+static inline u32 msg_session(struct tipc_msg *m)
+{
+ return msg_bits(m, 5, 16, 0xffff);
+}
+
+static inline void msg_set_session(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 5, 16, 0xffff, n);
+}
+
+static inline u32 msg_probe(struct tipc_msg *m)
+{
+ return msg_bits(m, 5, 0, 1);
+}
+
+static inline void msg_set_probe(struct tipc_msg *m, u32 val)
+{
+ msg_set_bits(m, 5, 0, 1, val);
+}
+
+static inline char msg_net_plane(struct tipc_msg *m)
+{
+ return msg_bits(m, 5, 1, 7) + 'A';
+}
+
+static inline void msg_set_net_plane(struct tipc_msg *m, char n)
+{
+ msg_set_bits(m, 5, 1, 7, (n - 'A'));
+}
+
+static inline u32 msg_linkprio(struct tipc_msg *m)
+{
+ return msg_bits(m, 5, 4, 0x1f);
+}
+
+static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 5, 4, 0x1f, n);
+}
+
+static inline u32 msg_bearer_id(struct tipc_msg *m)
+{
+ return msg_bits(m, 5, 9, 0x7);
+}
+
+static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 5, 9, 0x7, n);
+}
+
+static inline u32 msg_redundant_link(struct tipc_msg *m)
+{
+ return msg_bits(m, 5, 12, 0x1);
+}
+
+static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
+{
+ msg_set_bits(m, 5, 12, 0x1, r);
+}
+
+static inline char *msg_media_addr(struct tipc_msg *m)
+{
+ return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
+}
+
+/*
+ * Word 9
+ */
+static inline u32 msg_msgcnt(struct tipc_msg *m)
+{
+ return msg_bits(m, 9, 16, 0xffff);
+}
+
+static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 9, 16, 0xffff, n);
+}
+
+static inline u32 msg_bcast_tag(struct tipc_msg *m)
+{
+ return msg_bits(m, 9, 16, 0xffff);
+}
+
+static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 9, 16, 0xffff, n);
+}
+
+static inline u32 msg_max_pkt(struct tipc_msg *m)
+{
+ return msg_bits(m, 9, 16, 0xffff) * 4;
+}
+
+static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 9, 16, 0xffff, (n / 4));
+}
+
+static inline u32 msg_link_tolerance(struct tipc_msg *m)
+{
+ return msg_bits(m, 9, 0, 0xffff);
+}
+
+static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
+{
+ msg_set_bits(m, 9, 0, 0xffff, n);
+}
+
+struct sk_buff *tipc_buf_acquire(u32 size);
+bool tipc_msg_validate(struct sk_buff *skb);
+bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
+ int err);
+void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
+ u32 hsize, u32 destnode);
+struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
+ uint data_sz, u32 dnode, u32 onode,
+ u32 dport, u32 oport, int errcode);
+int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
+bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu);
+
+bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode);
+bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
+int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
+ int offset, int dsz, int mtu, struct sk_buff_head *list);
+bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, u32 *dnode,
+ int *err);
+struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list);
+
+/* tipc_skb_peek(): peek and reserve first buffer in list
+ * @list: list to be peeked in
+ * Returns pointer to first buffer in list, if any
+ */
+static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
+ spinlock_t *lock)
+{
+ struct sk_buff *skb;
+
+ spin_lock_bh(lock);
+ skb = skb_peek(list);
+ if (skb)
+ skb_get(skb);
+ spin_unlock_bh(lock);
+ return skb;
+}
+
+/* tipc_skb_peek_port(): find a destination port, ignoring all destinations
+ * up to and including 'filter'.
+ * Note: ignoring previously tried destinations minimizes the risk of
+ * contention on the socket lock
+ * @list: list to be peeked in
+ * @filter: last destination to be ignored from search
+ * Returns a destination port number, of applicable.
+ */
+static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
+{
+ struct sk_buff *skb;
+ u32 dport = 0;
+ bool ignore = true;
+
+ spin_lock_bh(&list->lock);
+ skb_queue_walk(list, skb) {
+ dport = msg_destport(buf_msg(skb));
+ if (!filter || skb_queue_is_last(list, skb))
+ break;
+ if (dport == filter)
+ ignore = false;
+ else if (!ignore)
+ break;
+ }
+ spin_unlock_bh(&list->lock);
+ return dport;
+}
+
+/* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
+ * @list: list to be unlinked from
+ * @dport: selection criteria for buffer to unlink
+ */
+static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
+ u32 dport)
+{
+ struct sk_buff *_skb, *tmp, *skb = NULL;
+
+ spin_lock_bh(&list->lock);
+ skb_queue_walk_safe(list, _skb, tmp) {
+ if (msg_destport(buf_msg(_skb)) == dport) {
+ __skb_unlink(_skb, list);
+ skb = _skb;
+ break;
+ }
+ }
+ spin_unlock_bh(&list->lock);
+ return skb;
+}
+
+/* tipc_skb_queue_tail(): add buffer to tail of list;
+ * @list: list to be appended to
+ * @skb: buffer to append. Always appended
+ * @dport: the destination port of the buffer
+ * returns true if dport differs from previous destination
+ */
+static inline bool tipc_skb_queue_tail(struct sk_buff_head *list,
+ struct sk_buff *skb, u32 dport)
+{
+ struct sk_buff *_skb = NULL;
+ bool rv = false;
+
+ spin_lock_bh(&list->lock);
+ _skb = skb_peek_tail(list);
+ if (!_skb || (msg_destport(buf_msg(_skb)) != dport) ||
+ (skb_queue_len(list) > 32))
+ rv = true;
+ __skb_queue_tail(list, skb);
+ spin_unlock_bh(&list->lock);
+ return rv;
+}
+
+#endif
Code Review / kvmfornfv.git / blobdiff