xref: /illumos-gate/usr/src/uts/common/inet/sctp/sctp_tunables.c (revision 299625c6492013aa7bd163862f0d181854f69b3c)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Copyright (c) 2013 by Delphix. All rights reserved.
25  */
26 
27 #include <inet/ip.h>
28 #include <inet/ip6.h>
29 #include <inet/sctp/sctp_stack.h>
30 #include <inet/sctp/sctp_impl.h>
31 #include <sys/sunddi.h>
32 
33 /* Max size IP datagram is 64k - 1 */
34 #define	SCTP_MSS_MAX_IPV4 (IP_MAXPACKET - (sizeof (ipha_t) + \
35 					sizeof (sctp_hdr_t)))
36 #define	SCTP_MSS_MAX_IPV6 (IP_MAXPACKET - (sizeof (ip6_t) + \
37 					sizeof (sctp_hdr_t)))
38 /* Max of the above */
39 #define	SCTP_MSS_MAX	SCTP_MSS_MAX_IPV4
40 
41 /*
42  * returns the current list of listener limit configuration.
43  */
44 /* ARGSUSED */
45 static int
sctp_listener_conf_get(netstack_t * stack,mod_prop_info_t * pinfo,const char * ifname,void * val,uint_t psize,uint_t flags)46 sctp_listener_conf_get(netstack_t *stack, mod_prop_info_t *pinfo,
47     const char *ifname, void *val, uint_t psize, uint_t flags)
48 {
49 	sctp_stack_t	*sctps = stack->netstack_sctp;
50 	sctp_listener_t	*sl;
51 	char		*pval = val;
52 	size_t		nbytes = 0, tbytes = 0;
53 	uint_t		size;
54 	int		err = 0;
55 
56 	bzero(pval, psize);
57 	size = psize;
58 
59 	if (flags & (MOD_PROP_DEFAULT|MOD_PROP_PERM|MOD_PROP_POSSIBLE))
60 		return (0);
61 
62 	mutex_enter(&sctps->sctps_listener_conf_lock);
63 	for (sl = list_head(&sctps->sctps_listener_conf); sl != NULL;
64 	    sl = list_next(&sctps->sctps_listener_conf, sl)) {
65 		if (psize == size)
66 			nbytes = snprintf(pval, size, "%d:%d",  sl->sl_port,
67 			    sl->sl_ratio);
68 		else
69 			nbytes = snprintf(pval, size, ",%d:%d",  sl->sl_port,
70 			    sl->sl_ratio);
71 		size -= nbytes;
72 		pval += nbytes;
73 		tbytes += nbytes;
74 		if (tbytes >= psize) {
75 			/* Buffer overflow, stop copying information */
76 			err = ENOBUFS;
77 			break;
78 		}
79 	}
80 
81 	mutex_exit(&sctps->sctps_listener_conf_lock);
82 	return (err);
83 }
84 
85 /*
86  * add a new listener limit configuration.
87  */
88 /* ARGSUSED */
89 static int
sctp_listener_conf_add(netstack_t * stack,cred_t * cr,mod_prop_info_t * pinfo,const char * ifname,const void * pval,uint_t flags)90 sctp_listener_conf_add(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
91     const char *ifname, const void* pval, uint_t flags)
92 {
93 	sctp_listener_t	*new_sl;
94 	sctp_listener_t	*sl;
95 	long		lport;
96 	long		ratio;
97 	char		*colon;
98 	sctp_stack_t	*sctps = stack->netstack_sctp;
99 
100 	if (flags & MOD_PROP_DEFAULT)
101 		return (ENOTSUP);
102 
103 	if (ddi_strtol(pval, &colon, 10, &lport) != 0 || lport <= 0 ||
104 	    lport > USHRT_MAX || *colon != ':') {
105 		return (EINVAL);
106 	}
107 	if (ddi_strtol(colon + 1, NULL, 10, &ratio) != 0 || ratio <= 0)
108 		return (EINVAL);
109 
110 	mutex_enter(&sctps->sctps_listener_conf_lock);
111 	for (sl = list_head(&sctps->sctps_listener_conf); sl != NULL;
112 	    sl = list_next(&sctps->sctps_listener_conf, sl)) {
113 		/* There is an existing entry, so update its ratio value. */
114 		if (sl->sl_port == lport) {
115 			sl->sl_ratio = ratio;
116 			mutex_exit(&sctps->sctps_listener_conf_lock);
117 			return (0);
118 		}
119 	}
120 
121 	if ((new_sl = kmem_alloc(sizeof (sctp_listener_t), KM_NOSLEEP)) ==
122 	    NULL) {
123 		mutex_exit(&sctps->sctps_listener_conf_lock);
124 		return (ENOMEM);
125 	}
126 
127 	new_sl->sl_port = lport;
128 	new_sl->sl_ratio = ratio;
129 	list_insert_tail(&sctps->sctps_listener_conf, new_sl);
130 	mutex_exit(&sctps->sctps_listener_conf_lock);
131 	return (0);
132 }
133 
134 /*
135  * remove a listener limit configuration.
136  */
137 /* ARGSUSED */
138 static int
sctp_listener_conf_del(netstack_t * stack,cred_t * cr,mod_prop_info_t * pinfo,const char * ifname,const void * pval,uint_t flags)139 sctp_listener_conf_del(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
140     const char *ifname, const void* pval, uint_t flags)
141 {
142 	sctp_listener_t	*sl;
143 	long		lport;
144 	sctp_stack_t	*sctps = stack->netstack_sctp;
145 
146 	if (flags & MOD_PROP_DEFAULT)
147 		return (ENOTSUP);
148 
149 	if (ddi_strtol(pval, NULL, 10, &lport) != 0 || lport <= 0 ||
150 	    lport > USHRT_MAX) {
151 		return (EINVAL);
152 	}
153 	mutex_enter(&sctps->sctps_listener_conf_lock);
154 	for (sl = list_head(&sctps->sctps_listener_conf); sl != NULL;
155 	    sl = list_next(&sctps->sctps_listener_conf, sl)) {
156 		if (sl->sl_port == lport) {
157 			list_remove(&sctps->sctps_listener_conf, sl);
158 			mutex_exit(&sctps->sctps_listener_conf_lock);
159 			kmem_free(sl, sizeof (sctp_listener_t));
160 			return (0);
161 		}
162 	}
163 	mutex_exit(&sctps->sctps_listener_conf_lock);
164 	return (ESRCH);
165 }
166 
167 static int
sctp_set_buf_prop(netstack_t * stack,cred_t * cr,mod_prop_info_t * pinfo,const char * ifname,const void * pval,uint_t flags)168 sctp_set_buf_prop(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
169     const char *ifname, const void *pval, uint_t flags)
170 {
171 	return (mod_set_buf_prop(stack->netstack_sctp->sctps_propinfo_tbl,
172 	    stack, cr, pinfo, ifname, pval, flags));
173 }
174 
175 static int
sctp_get_buf_prop(netstack_t * stack,mod_prop_info_t * pinfo,const char * ifname,void * val,uint_t psize,uint_t flags)176 sctp_get_buf_prop(netstack_t *stack, mod_prop_info_t *pinfo, const char *ifname,
177     void *val, uint_t psize, uint_t flags)
178 {
179 	return (mod_get_buf_prop(stack->netstack_sctp->sctps_propinfo_tbl,
180 	    stack, pinfo, ifname, val, psize, flags));
181 }
182 
183 /*
184  * All of these are alterable, within the min/max values given, at run time.
185  *
186  * Note: All those tunables which do not start with "_" are Committed and
187  * therefore are public. See PSARC 2010/080.
188  */
189 mod_prop_info_t sctp_propinfo_tbl[] = {
190 	{ "_max_init_retr", MOD_PROTO_SCTP,
191 	    mod_set_uint32, mod_get_uint32,
192 	    {0, 128, 8}, {8} },
193 
194 	{ "_pa_max_retr", MOD_PROTO_SCTP,
195 	    mod_set_uint32, mod_get_uint32,
196 	    {1, 128, 10}, {10} },
197 
198 	{ "_pp_max_retr", MOD_PROTO_SCTP,
199 	    mod_set_uint32, mod_get_uint32,
200 	    {1, 128, 5}, {5} },
201 
202 	{ "_cwnd_max", MOD_PROTO_SCTP,
203 	    mod_set_uint32, mod_get_uint32,
204 	    {128, ULP_MAX_BUF, 1024*1024}, {1024*1024} },
205 
206 	{ "smallest_nonpriv_port", MOD_PROTO_SCTP,
207 	    mod_set_uint32, mod_get_uint32,
208 	    {1024, (32*1024), 1024}, {1024} },
209 
210 	{ "_ipv4_ttl", MOD_PROTO_SCTP,
211 	    mod_set_uint32, mod_get_uint32,
212 	    {1, 255, 64}, {64} },
213 
214 	{ "_heartbeat_interval", MOD_PROTO_SCTP,
215 	    mod_set_uint32, mod_get_uint32,
216 	    {0, 1*DAYS, 30*SECONDS}, {30*SECONDS} },
217 
218 	{ "_initial_mtu", MOD_PROTO_SCTP,
219 	    mod_set_uint32, mod_get_uint32,
220 	    {68, 65535, 1500}, {1500} },
221 
222 	{ "_mtu_probe_interval", MOD_PROTO_SCTP,
223 	    mod_set_uint32, mod_get_uint32,
224 	    {0, 1*DAYS, 10*MINUTES}, {10*MINUTES} },
225 
226 	{ "_new_secret_interval", MOD_PROTO_SCTP,
227 	    mod_set_uint32, mod_get_uint32,
228 	    {0, 1*DAYS, 2*MINUTES}, {2*MINUTES} },
229 
230 	/* tunable - 10 */
231 	{ "_deferred_ack_interval", MOD_PROTO_SCTP,
232 	    mod_set_uint32, mod_get_uint32,
233 	    {10*MS, 1*MINUTES, 100*MS}, {100*MS} },
234 
235 	{ "_snd_lowat_fraction", MOD_PROTO_SCTP,
236 	    mod_set_uint32, mod_get_uint32,
237 	    {0, 16, 0}, {0} },
238 
239 	{ "_ignore_path_mtu", MOD_PROTO_SCTP,
240 	    mod_set_boolean, mod_get_boolean,
241 	    {B_FALSE}, {B_FALSE} },
242 
243 	{ "_initial_ssthresh", MOD_PROTO_SCTP,
244 	    mod_set_uint32, mod_get_uint32,
245 	    {1024, UINT32_MAX, SCTP_RECV_HIWATER}, { SCTP_RECV_HIWATER} },
246 
247 	{ "smallest_anon_port", MOD_PROTO_SCTP,
248 	    mod_set_uint32, mod_get_uint32,
249 	    {1024, ULP_MAX_PORT, 32*1024}, {32*1024} },
250 
251 	{ "largest_anon_port", MOD_PROTO_SCTP,
252 	    mod_set_uint32, mod_get_uint32,
253 	    {1024, ULP_MAX_PORT, ULP_MAX_PORT}, {ULP_MAX_PORT} },
254 
255 	{ "send_buf", MOD_PROTO_SCTP,
256 	    sctp_set_buf_prop, sctp_get_buf_prop,
257 	    {SCTP_XMIT_LOWATER,  ULP_MAX_BUF,  SCTP_XMIT_HIWATER},
258 	    {SCTP_XMIT_HIWATER} },
259 
260 	{ "_xmit_lowat", MOD_PROTO_SCTP,
261 	    mod_set_uint32, mod_get_uint32,
262 	    {SCTP_XMIT_LOWATER,  ULP_MAX_BUF,  SCTP_XMIT_LOWATER},
263 	    {SCTP_XMIT_LOWATER} },
264 
265 	{ "recv_buf", MOD_PROTO_SCTP,
266 	    sctp_set_buf_prop, sctp_get_buf_prop,
267 	    {SCTP_RECV_LOWATER,  ULP_MAX_BUF,  SCTP_RECV_HIWATER},
268 	    {SCTP_RECV_HIWATER} },
269 
270 	{ "max_buf", MOD_PROTO_SCTP,
271 	    mod_set_uint32, mod_get_uint32,
272 	    {8192, ULP_MAX_BUF, 1024*1024}, {1024*1024} },
273 
274 	/* tunable - 20 */
275 	{ "_rtt_updates", MOD_PROTO_SCTP,
276 	    mod_set_uint32, mod_get_uint32,
277 	    {0, 65536, 20}, {20} },
278 
279 	{ "_ipv6_hoplimit", MOD_PROTO_SCTP,
280 	    mod_set_uint32, mod_get_uint32,
281 	    {0, IPV6_MAX_HOPS, IPV6_DEFAULT_HOPS}, {IPV6_DEFAULT_HOPS} },
282 
283 	{ "_rto_min", MOD_PROTO_SCTP,
284 	    mod_set_uint32, mod_get_uint32,
285 	    {500*MS, 60*SECONDS, 1*SECONDS}, {1*SECONDS} },
286 
287 	{ "_rto_max", MOD_PROTO_SCTP,
288 	    mod_set_uint32, mod_get_uint32,
289 	    {1*SECONDS, 60000*SECONDS, 60*SECONDS}, {60*SECONDS} },
290 
291 	{ "_rto_initial", MOD_PROTO_SCTP,
292 	    mod_set_uint32, mod_get_uint32,
293 	    {1*SECONDS, 60000*SECONDS, 3*SECONDS}, {3*SECONDS} },
294 
295 	{ "_cookie_life", MOD_PROTO_SCTP,
296 	    mod_set_uint32, mod_get_uint32,
297 	    {10*MS, 60000*SECONDS, 60*SECONDS}, {60*SECONDS} },
298 
299 	{ "_max_in_streams", MOD_PROTO_SCTP,
300 	    mod_set_uint32, mod_get_uint32,
301 	    {1, UINT16_MAX, 32}, {32} },
302 
303 	{ "_initial_out_streams", MOD_PROTO_SCTP,
304 	    mod_set_uint32, mod_get_uint32,
305 	    {1, UINT16_MAX, 32}, {32} },
306 
307 	{ "_shutack_wait_bound", MOD_PROTO_SCTP,
308 	    mod_set_uint32, mod_get_uint32,
309 	    {0, 300*SECONDS, 60*SECONDS}, {60*SECONDS} },
310 
311 	{ "_maxburst", MOD_PROTO_SCTP,
312 	    mod_set_uint32, mod_get_uint32,
313 	    {2, 8, 4}, {4} },
314 
315 	/* tunable - 30 */
316 	{ "_addip_enabled", MOD_PROTO_SCTP,
317 	    mod_set_boolean, mod_get_boolean,
318 	    {B_FALSE}, {B_FALSE} },
319 
320 	{ "_recv_hiwat_minmss", MOD_PROTO_SCTP,
321 	    mod_set_uint32, mod_get_uint32,
322 	    {1, 65536, 4}, {4} },
323 
324 	{ "_slow_start_initial", MOD_PROTO_SCTP,
325 	    mod_set_uint32, mod_get_uint32,
326 	    {1, 16, 4}, {4} },
327 
328 	{ "_slow_start_after_idle", MOD_PROTO_SCTP,
329 	    mod_set_uint32, mod_get_uint32,
330 	    {1, 16384, 4}, {4} },
331 
332 	{ "_prsctp_enabled", MOD_PROTO_SCTP,
333 	    mod_set_boolean, mod_get_boolean,
334 	    {B_TRUE}, {B_TRUE} },
335 
336 	{ "_fast_rxt_thresh", MOD_PROTO_SCTP,
337 	    mod_set_uint32, mod_get_uint32,
338 	    {1, 10000, 3}, {3} },
339 
340 	{ "_deferred_acks_max", MOD_PROTO_SCTP,
341 	    mod_set_uint32, mod_get_uint32,
342 	    { 1, 16, 2}, {2} },
343 
344 	/*
345 	 * sctp_wroff_xtra is the extra space in front of SCTP/IP header
346 	 * for link layer header.  It has to be a multiple of 8.
347 	 */
348 	{ "_wroff_xtra", MOD_PROTO_SCTP,
349 	    mod_set_aligned, mod_get_uint32,
350 	    {0, 256, 32}, {32} },
351 
352 	{ "extra_priv_ports", MOD_PROTO_SCTP,
353 	    mod_set_extra_privports, mod_get_extra_privports,
354 	    {1, ULP_MAX_PORT, 0}, {0} },
355 
356 	{ "_listener_limit_conf", MOD_PROTO_SCTP,
357 	    NULL, sctp_listener_conf_get, {0}, {0} },
358 
359 	{ "_listener_limit_conf_add", MOD_PROTO_SCTP,
360 	    sctp_listener_conf_add, NULL, {0}, {0} },
361 
362 	{ "_listener_limit_conf_del", MOD_PROTO_SCTP,
363 	    sctp_listener_conf_del, NULL, {0}, {0} },
364 
365 	{ "?", MOD_PROTO_SCTP, NULL, mod_get_allprop, {0}, {0} },
366 
367 	{ NULL, 0, NULL, NULL, {0}, {0} }
368 };
369 
370 int sctp_propinfo_count = A_CNT(sctp_propinfo_tbl);
371