1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010 Riccardo Panicucci, Universita` di Pisa
5 * All rights reserved
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * $FreeBSD$
31 */
32
33 #ifdef _KERNEL
34 #include <sys/malloc.h>
35 #include <sys/socket.h>
36 #include <sys/socketvar.h>
37 #include <sys/kernel.h>
38 #include <sys/lock.h>
39 #include <sys/mbuf.h>
40 #include <sys/module.h>
41 #include <sys/rwlock.h>
42 #include <net/if.h> /* IFNAMSIZ */
43 #include <netinet/in.h>
44 #include <netinet/ip_var.h> /* ipfw_rule_ref */
45 #include <netinet/ip_fw.h> /* flow_id */
46 #include <netinet/ip_dummynet.h>
47 #include <netpfil/ipfw/ip_fw_private.h>
48 #include <netpfil/ipfw/dn_heap.h>
49 #include <netpfil/ipfw/ip_dn_private.h>
50 #ifdef NEW_AQM
51 #include <netpfil/ipfw/dn_aqm.h>
52 #endif
53 #include <netpfil/ipfw/dn_sched.h>
54 #else
55 #include <dn_test.h>
56 #endif
57
58 /*
59 * This file implements a FIFO scheduler for a single queue.
60 * The queue is allocated as part of the scheduler instance,
61 * and there is a single flowset is in the template which stores
62 * queue size and policy.
63 * Enqueue and dequeue use the default library functions.
64 */
65 static int
66 fifo_enqueue(struct dn_sch_inst *si, struct dn_queue *q, struct mbuf *m)
67 {
68 /* XXX if called with q != NULL and m=NULL, this is a
69 * re-enqueue from an existing scheduler, which we should
70 * handle.
71 */
72 (void)q;
73 return dn_enqueue((struct dn_queue *)(si+1), m, 0);
74 }
75
76 static struct mbuf *
77 fifo_dequeue(struct dn_sch_inst *si)
78 {
79 return dn_dequeue((struct dn_queue *)(si + 1));
80 }
81
82 static int
83 fifo_new_sched(struct dn_sch_inst *si)
84 {
85 /* This scheduler instance contains the queue */
86 struct dn_queue *q = (struct dn_queue *)(si + 1);
87
88 set_oid(&q->ni.oid, DN_QUEUE, sizeof(*q));
89 q->_si = si;
90 q->fs = si->sched->fs;
91 return 0;
92 }
93
94 static int
95 fifo_free_sched(struct dn_sch_inst *si)
96 {
97 struct dn_queue *q = (struct dn_queue *)(si + 1);
98 dn_free_pkts(q->mq.head);
99 bzero(q, sizeof(*q));
100 return 0;
101 }
102
103 /*
104 * FIFO scheduler descriptor
105 * contains the type of the scheduler, the name, the size of extra
106 * data structures, and function pointers.
107 */
108 static struct dn_alg fifo_desc = {
109 _SI( .type = ) DN_SCHED_FIFO,
110 _SI( .name = ) "FIFO",
111 _SI( .flags = ) 0,
112
113 _SI( .schk_datalen = ) 0,
114 _SI( .si_datalen = ) sizeof(struct dn_queue),
115 _SI( .q_datalen = ) 0,
116
117 _SI( .enqueue = ) fifo_enqueue,
118 _SI( .dequeue = ) fifo_dequeue,
119 _SI( .config = ) NULL,
120 _SI( .destroy = ) NULL,
121 _SI( .new_sched = ) fifo_new_sched,
122 _SI( .free_sched = ) fifo_free_sched,
123 _SI( .new_fsk = ) NULL,
124 _SI( .free_fsk = ) NULL,
125 _SI( .new_queue = ) NULL,
126 _SI( .free_queue = ) NULL,
127 #ifdef NEW_AQM
128 _SI( .getconfig = ) NULL,
129 #endif
130 };
131
132 DECLARE_DNSCHED_MODULE(dn_fifo, &fifo_desc);
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