1 /**
2  * @file
3  * Modules initialization
4  *
5  */
6 
7 /*
8  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without modification,
12  * are permitted provided that the following conditions are met:
13  *
14  * 1. Redistributions of source code must retain the above copyright notice,
15  *    this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright notice,
17  *    this list of conditions and the following disclaimer in the documentation
18  *    and/or other materials provided with the distribution.
19  * 3. The name of the author may not be used to endorse or promote products
20  *    derived from this software without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31  * OF SUCH DAMAGE.
32  *
33  * This file is part of the lwIP TCP/IP stack.
34  *
35  * Author: Adam Dunkels <adam@sics.se>
36  */
37 
38 #include "lwip/opt.h"
39 
40 #include "lwip/init.h"
41 #include "lwip/stats.h"
42 #include "lwip/sys.h"
43 #include "lwip/mem.h"
44 #include "lwip/memp.h"
45 #include "lwip/pbuf.h"
46 #include "lwip/netif.h"
47 #include "lwip/sockets.h"
48 #include "lwip/ip.h"
49 #include "lwip/raw.h"
50 #include "lwip/udp.h"
51 #include "lwip/priv/tcp_priv.h"
52 #include "lwip/igmp.h"
53 #include "lwip/dns.h"
54 #include "lwip/timeouts.h"
55 #include "lwip/etharp.h"
56 #include "lwip/ip6.h"
57 #include "lwip/nd6.h"
58 #include "lwip/mld6.h"
59 #include "lwip/api.h"
60 
61 #include "netif/ppp/ppp_opts.h"
62 #include "netif/ppp/ppp_impl.h"
63 
64 #ifndef LWIP_SKIP_PACKING_CHECK
65 
66 #ifdef PACK_STRUCT_USE_INCLUDES
67 #  include "arch/bpstruct.h"
68 #endif
69 PACK_STRUCT_BEGIN
70 struct packed_struct_test
71 {
72   PACK_STRUCT_FLD_8(u8_t  dummy1);
73   PACK_STRUCT_FIELD(u32_t dummy2);
74 } PACK_STRUCT_STRUCT;
75 PACK_STRUCT_END
76 #ifdef PACK_STRUCT_USE_INCLUDES
77 #  include "arch/epstruct.h"
78 #endif
79 #define PACKED_STRUCT_TEST_EXPECTED_SIZE 5
80 
81 #endif
82 
83 /* Compile-time sanity checks for configuration errors.
84  * These can be done independently of LWIP_DEBUG, without penalty.
85  */
86 #ifndef BYTE_ORDER
87   #error "BYTE_ORDER is not defined, you have to define it in your cc.h"
88 #endif
89 #if (!IP_SOF_BROADCAST && IP_SOF_BROADCAST_RECV)
90   #error "If you want to use broadcast filter per pcb on recv operations, you have to define IP_SOF_BROADCAST=1 in your lwipopts.h"
91 #endif
92 #if (!LWIP_UDP && LWIP_UDPLITE)
93   #error "If you want to use UDP Lite, you have to define LWIP_UDP=1 in your lwipopts.h"
94 #endif
95 #if (!LWIP_UDP && LWIP_DHCP)
96   #error "If you want to use DHCP, you have to define LWIP_UDP=1 in your lwipopts.h"
97 #endif
98 #if (!LWIP_UDP && LWIP_MULTICAST_TX_OPTIONS)
99   #error "If you want to use IGMP/LWIP_MULTICAST_TX_OPTIONS, you have to define LWIP_UDP=1 in your lwipopts.h"
100 #endif
101 #if (!LWIP_UDP && LWIP_DNS)
102   #error "If you want to use DNS, you have to define LWIP_UDP=1 in your lwipopts.h"
103 #endif
104 #if !MEMP_MEM_MALLOC /* MEMP_NUM_* checks are disabled when not using the pool allocator */
105 #if (LWIP_ARP && ARP_QUEUEING && (MEMP_NUM_ARP_QUEUE<=0))
106   #error "If you want to use ARP Queueing, you have to define MEMP_NUM_ARP_QUEUE>=1 in your lwipopts.h"
107 #endif
108 #if (LWIP_RAW && (MEMP_NUM_RAW_PCB<=0))
109   #error "If you want to use RAW, you have to define MEMP_NUM_RAW_PCB>=1 in your lwipopts.h"
110 #endif
111 #if (LWIP_UDP && (MEMP_NUM_UDP_PCB<=0))
112   #error "If you want to use UDP, you have to define MEMP_NUM_UDP_PCB>=1 in your lwipopts.h"
113 #endif
114 #if (LWIP_TCP && (MEMP_NUM_TCP_PCB<=0))
115   #error "If you want to use TCP, you have to define MEMP_NUM_TCP_PCB>=1 in your lwipopts.h"
116 #endif
117 #if (LWIP_IGMP && (MEMP_NUM_IGMP_GROUP<=1))
118   #error "If you want to use IGMP, you have to define MEMP_NUM_IGMP_GROUP>1 in your lwipopts.h"
119 #endif
120 #if (LWIP_IGMP && !LWIP_MULTICAST_TX_OPTIONS)
121   #error "If you want to use IGMP, you have to define LWIP_MULTICAST_TX_OPTIONS==1 in your lwipopts.h"
122 #endif
123 #if (LWIP_IGMP && !LWIP_IPV4)
124   #error "IGMP needs LWIP_IPV4 enabled in your lwipopts.h"
125 #endif
126 #if (LWIP_MULTICAST_TX_OPTIONS && !LWIP_IPV4)
127   #error "LWIP_MULTICAST_TX_OPTIONS needs LWIP_IPV4 enabled in your lwipopts.h"
128 #endif
129 #if ((LWIP_NETCONN || LWIP_SOCKET) && (MEMP_NUM_TCPIP_MSG_API<=0))
130   #error "If you want to use Sequential API, you have to define MEMP_NUM_TCPIP_MSG_API>=1 in your lwipopts.h"
131 #endif
132 /* There must be sufficient timeouts, taking into account requirements of the subsystems. */
133 #if LWIP_TIMERS && (MEMP_NUM_SYS_TIMEOUT < (LWIP_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_AUTOIP + LWIP_IGMP + LWIP_DNS + PPP_SUPPORT + (LWIP_IPV6 ? (1 + LWIP_IPV6_REASS + LWIP_IPV6_MLD) : 0)))
134   #error "MEMP_NUM_SYS_TIMEOUT is too low to accomodate all required timeouts"
135 #endif
136 #if (IP_REASSEMBLY && (MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS))
137   #error "MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS doesn't make sense since each struct ip_reassdata must hold 2 pbufs at least!"
138 #endif
139 #endif /* !MEMP_MEM_MALLOC */
140 #if LWIP_WND_SCALE
141 #if (LWIP_TCP && (TCP_WND > 0xffffffff))
142   #error "If you want to use TCP, TCP_WND must fit in an u32_t, so, you have to reduce it in your lwipopts.h"
143 #endif
144 #if (LWIP_TCP && LWIP_WND_SCALE && (TCP_RCV_SCALE > 14))
145   #error "The maximum valid window scale value is 14!"
146 #endif
147 #if (LWIP_TCP && (TCP_WND > (0xFFFFU << TCP_RCV_SCALE)))
148   #error "TCP_WND is bigger than the configured LWIP_WND_SCALE allows!"
149 #endif
150 #if (LWIP_TCP && ((TCP_WND >> TCP_RCV_SCALE) == 0))
151   #error "TCP_WND is too small for the configured LWIP_WND_SCALE (results in zero window)!"
152 #endif
153 #else /* LWIP_WND_SCALE */
154 #if (LWIP_TCP && (TCP_WND > 0xffff))
155   #error "If you want to use TCP, TCP_WND must fit in an u16_t, so, you have to reduce it in your lwipopts.h (or enable window scaling)"
156 #endif
157 #endif /* LWIP_WND_SCALE */
158 #if (LWIP_TCP && (TCP_SND_QUEUELEN > 0xffff))
159   #error "If you want to use TCP, TCP_SND_QUEUELEN must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
160 #endif
161 #if (LWIP_TCP && (TCP_SND_QUEUELEN < 2))
162   #error "TCP_SND_QUEUELEN must be at least 2 for no-copy TCP writes to work"
163 #endif
164 #if (LWIP_TCP && ((TCP_MAXRTX > 12) || (TCP_SYNMAXRTX > 12)))
165   #error "If you want to use TCP, TCP_MAXRTX and TCP_SYNMAXRTX must less or equal to 12 (due to tcp_backoff table), so, you have to reduce them in your lwipopts.h"
166 #endif
167 #if (LWIP_TCP && TCP_LISTEN_BACKLOG && ((TCP_DEFAULT_LISTEN_BACKLOG < 0) || (TCP_DEFAULT_LISTEN_BACKLOG > 0xff)))
168   #error "If you want to use TCP backlog, TCP_DEFAULT_LISTEN_BACKLOG must fit into an u8_t"
169 #endif
170 #if (LWIP_TCP && LWIP_TCP_SACK_OUT && !TCP_QUEUE_OOSEQ)
171 #error "To use LWIP_TCP_SACK_OUT, TCP_QUEUE_OOSEQ needs to be enabled"
172 #endif
173 #if (LWIP_TCP && LWIP_TCP_SACK_OUT && (LWIP_TCP_MAX_SACK_NUM < 1))
174 #error "LWIP_TCP_MAX_SACK_NUM must be greater than 0"
175 #endif
176 #if (LWIP_NETIF_API && (NO_SYS==1))
177   #error "If you want to use NETIF API, you have to define NO_SYS=0 in your lwipopts.h"
178 #endif
179 #if ((LWIP_SOCKET || LWIP_NETCONN) && (NO_SYS==1))
180   #error "If you want to use Sequential API, you have to define NO_SYS=0 in your lwipopts.h"
181 #endif
182 #if (LWIP_PPP_API && (NO_SYS==1))
183   #error "If you want to use PPP API, you have to define NO_SYS=0 in your lwipopts.h"
184 #endif
185 #if (LWIP_PPP_API && (PPP_SUPPORT==0))
186   #error "If you want to use PPP API, you have to enable PPP_SUPPORT in your lwipopts.h"
187 #endif
188 #if (((!LWIP_DHCP) || (!LWIP_AUTOIP)) && LWIP_DHCP_AUTOIP_COOP)
189   #error "If you want to use DHCP/AUTOIP cooperation mode, you have to define LWIP_DHCP=1 and LWIP_AUTOIP=1 in your lwipopts.h"
190 #endif
191 #if (((!LWIP_DHCP) || (!LWIP_ARP)) && DHCP_DOES_ARP_CHECK)
192   #error "If you want to use DHCP ARP checking, you have to define LWIP_DHCP=1 and LWIP_ARP=1 in your lwipopts.h"
193 #endif
194 #if (!LWIP_ARP && LWIP_AUTOIP)
195   #error "If you want to use AUTOIP, you have to define LWIP_ARP=1 in your lwipopts.h"
196 #endif
197 #if (LWIP_TCP && ((LWIP_EVENT_API && LWIP_CALLBACK_API) || (!LWIP_EVENT_API && !LWIP_CALLBACK_API)))
198   #error "One and exactly one of LWIP_EVENT_API and LWIP_CALLBACK_API has to be enabled in your lwipopts.h"
199 #endif
200 #if (MEM_LIBC_MALLOC && MEM_USE_POOLS)
201   #error "MEM_LIBC_MALLOC and MEM_USE_POOLS may not both be simultaneously enabled in your lwipopts.h"
202 #endif
203 #if (MEM_USE_POOLS && !MEMP_USE_CUSTOM_POOLS)
204   #error "MEM_USE_POOLS requires custom pools (MEMP_USE_CUSTOM_POOLS) to be enabled in your lwipopts.h"
205 #endif
206 #if (PBUF_POOL_BUFSIZE <= MEM_ALIGNMENT)
207   #error "PBUF_POOL_BUFSIZE must be greater than MEM_ALIGNMENT or the offset may take the full first pbuf"
208 #endif
209 #if (DNS_LOCAL_HOSTLIST && !DNS_LOCAL_HOSTLIST_IS_DYNAMIC && !(defined(DNS_LOCAL_HOSTLIST_INIT)))
210   #error "you have to define define DNS_LOCAL_HOSTLIST_INIT {{'host1', 0x123}, {'host2', 0x234}} to initialize DNS_LOCAL_HOSTLIST"
211 #endif
212 #if PPP_SUPPORT && !PPPOS_SUPPORT && !PPPOE_SUPPORT && !PPPOL2TP_SUPPORT
213   #error "PPP_SUPPORT needs at least one of PPPOS_SUPPORT, PPPOE_SUPPORT or PPPOL2TP_SUPPORT turned on"
214 #endif
215 #if PPP_SUPPORT && !PPP_IPV4_SUPPORT && !PPP_IPV6_SUPPORT
216   #error "PPP_SUPPORT needs PPP_IPV4_SUPPORT and/or PPP_IPV6_SUPPORT turned on"
217 #endif
218 #if PPP_SUPPORT && PPP_IPV4_SUPPORT && !LWIP_IPV4
219   #error "PPP_IPV4_SUPPORT needs LWIP_IPV4 turned on"
220 #endif
221 #if PPP_SUPPORT && PPP_IPV6_SUPPORT && !LWIP_IPV6
222   #error "PPP_IPV6_SUPPORT needs LWIP_IPV6 turned on"
223 #endif
224 #if !LWIP_ETHERNET && (LWIP_ARP || PPPOE_SUPPORT)
225   #error "LWIP_ETHERNET needs to be turned on for LWIP_ARP or PPPOE_SUPPORT"
226 #endif
227 #if (LWIP_IGMP || LWIP_IPV6) && !defined(LWIP_RAND)
228   #error "When using IGMP or IPv6, LWIP_RAND() needs to be defined to a random-function returning an u32_t random value (in arch/cc.h)"
229 #endif
230 #if LWIP_TCPIP_CORE_LOCKING_INPUT && !LWIP_TCPIP_CORE_LOCKING
231   #error "When using LWIP_TCPIP_CORE_LOCKING_INPUT, LWIP_TCPIP_CORE_LOCKING must be enabled, too"
232 #endif
233 #if LWIP_TCP && LWIP_NETIF_TX_SINGLE_PBUF && !TCP_OVERSIZE
234   #error "LWIP_NETIF_TX_SINGLE_PBUF needs TCP_OVERSIZE enabled to create single-pbuf TCP packets"
235 #endif
236 #if LWIP_NETCONN && LWIP_TCP
237 #if NETCONN_COPY != TCP_WRITE_FLAG_COPY
238   #error "NETCONN_COPY != TCP_WRITE_FLAG_COPY"
239 #endif
240 #if NETCONN_MORE != TCP_WRITE_FLAG_MORE
241   #error "NETCONN_MORE != TCP_WRITE_FLAG_MORE"
242 #endif
243 #endif /* LWIP_NETCONN && LWIP_TCP */
244 #if LWIP_SOCKET
245 /* Check that the SO_* socket options and SOF_* lwIP-internal flags match */
246 #if SO_REUSEADDR != SOF_REUSEADDR
247   #error "WARNING: SO_REUSEADDR != SOF_REUSEADDR"
248 #endif
249 #if SO_KEEPALIVE != SOF_KEEPALIVE
250   #error "WARNING: SO_KEEPALIVE != SOF_KEEPALIVE"
251 #endif
252 #if SO_BROADCAST != SOF_BROADCAST
253   #error "WARNING: SO_BROADCAST != SOF_BROADCAST"
254 #endif
255 #endif /* LWIP_SOCKET */
256 
257 
258 /* Compile-time checks for deprecated options.
259  */
260 #ifdef MEMP_NUM_TCPIP_MSG
261   #error "MEMP_NUM_TCPIP_MSG option is deprecated. Remove it from your lwipopts.h."
262 #endif
263 #ifdef TCP_REXMIT_DEBUG
264   #error "TCP_REXMIT_DEBUG option is deprecated. Remove it from your lwipopts.h."
265 #endif
266 #ifdef RAW_STATS
267   #error "RAW_STATS option is deprecated. Remove it from your lwipopts.h."
268 #endif
269 #ifdef ETHARP_QUEUE_FIRST
270   #error "ETHARP_QUEUE_FIRST option is deprecated. Remove it from your lwipopts.h."
271 #endif
272 #ifdef ETHARP_ALWAYS_INSERT
273   #error "ETHARP_ALWAYS_INSERT option is deprecated. Remove it from your lwipopts.h."
274 #endif
275 #if !NO_SYS && LWIP_TCPIP_CORE_LOCKING && LWIP_COMPAT_MUTEX && !defined(LWIP_COMPAT_MUTEX_ALLOWED)
276   #error "LWIP_COMPAT_MUTEX cannot prevent priority inversion. It is recommended to implement priority-aware mutexes. (Define LWIP_COMPAT_MUTEX_ALLOWED to disable this error.)"
277 #endif
278 
279 #ifndef LWIP_DISABLE_TCP_SANITY_CHECKS
280 #define LWIP_DISABLE_TCP_SANITY_CHECKS  0
281 #endif
282 #ifndef LWIP_DISABLE_MEMP_SANITY_CHECKS
283 #define LWIP_DISABLE_MEMP_SANITY_CHECKS 0
284 #endif
285 
286 /* MEMP sanity checks */
287 #if MEMP_MEM_MALLOC
288 #if !LWIP_DISABLE_MEMP_SANITY_CHECKS
289 #if LWIP_NETCONN || LWIP_SOCKET
290 #if !MEMP_NUM_NETCONN && LWIP_SOCKET
291 #error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN cannot be 0 when using sockets!"
292 #endif
293 #else /* MEMP_MEM_MALLOC */
294 #if MEMP_NUM_NETCONN > (MEMP_NUM_TCP_PCB+MEMP_NUM_TCP_PCB_LISTEN+MEMP_NUM_UDP_PCB+MEMP_NUM_RAW_PCB)
295 #error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN should be less than the sum of MEMP_NUM_{TCP,RAW,UDP}_PCB+MEMP_NUM_TCP_PCB_LISTEN. If you know what you are doing, define LWIP_DISABLE_MEMP_SANITY_CHECKS to 1 to disable this error."
296 #endif
297 #endif /* LWIP_NETCONN || LWIP_SOCKET */
298 #endif /* !LWIP_DISABLE_MEMP_SANITY_CHECKS */
299 #if MEM_USE_POOLS
300 #error "MEMP_MEM_MALLOC and MEM_USE_POOLS cannot be enabled at the same time"
301 #endif
302 #ifdef LWIP_HOOK_MEMP_AVAILABLE
303 #error "LWIP_HOOK_MEMP_AVAILABLE doesn't make sense with MEMP_MEM_MALLOC"
304 #endif
305 #endif /* MEMP_MEM_MALLOC */
306 
307 /* TCP sanity checks */
308 #if !LWIP_DISABLE_TCP_SANITY_CHECKS
309 #if LWIP_TCP
310 #if !MEMP_MEM_MALLOC && (MEMP_NUM_TCP_SEG < TCP_SND_QUEUELEN)
311   #error "lwip_sanity_check: WARNING: MEMP_NUM_TCP_SEG should be at least as big as TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
312 #endif
313 #if TCP_SND_BUF < (2 * TCP_MSS)
314   #error "lwip_sanity_check: WARNING: TCP_SND_BUF must be at least as much as (2 * TCP_MSS) for things to work smoothly. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
315 #endif
316 #if TCP_SND_QUEUELEN < (2 * (TCP_SND_BUF / TCP_MSS))
317   #error "lwip_sanity_check: WARNING: TCP_SND_QUEUELEN must be at least as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
318 #endif
319 #if TCP_SNDLOWAT >= TCP_SND_BUF
320   #error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than TCP_SND_BUF. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
321 #endif
322 #if TCP_SNDLOWAT >= (0xFFFF - (4 * TCP_MSS))
323   #error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must at least be 4*MSS below u16_t overflow!"
324 #endif
325 #if TCP_SNDQUEUELOWAT >= TCP_SND_QUEUELEN
326   #error "lwip_sanity_check: WARNING: TCP_SNDQUEUELOWAT must be less than TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
327 #endif
328 #if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (PBUF_POOL_BUFSIZE <= (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))
329   #error "lwip_sanity_check: WARNING: PBUF_POOL_BUFSIZE does not provide enough space for protocol headers. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
330 #endif
331 #if LWIP_XR_EXT && LWIP_XR_EXT_MBUF_SUPPORT && LWIP_XR_EXT_PBUF_POOL_SMALL /* large TCP_WND needs more buffer */
332 #if !MEMP_MEM_MALLOC && (TCP_WND > (PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - (PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))) + (LWIP_XR_EXT_PBUF_POOL_SMALL_SIZE * (LWIP_XR_EXT_PBUF_POOL_SMALL_BUFSIZE - (PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))))
333   #error "lwip_sanity_check: WARNING: TCP_WND is larger than space provided by PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - protocol headers). If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
334 #endif
335 #else /* LWIP_XR_EXT && LWIP_XR_EXT_MBUF_SUPPORT && LWIP_XR_EXT_PBUF_POOL_SMALL */
336 #if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (TCP_WND > (PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))))
337   #error "lwip_sanity_check: WARNING: TCP_WND is larger than space provided by PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - protocol headers). If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
338 #endif
339 #endif /* LWIP_XR_EXT && LWIP_XR_EXT_MBUF_SUPPORT && LWIP_XR_EXT_PBUF_POOL_SMALL */
340 
341 #if TCP_WND < TCP_MSS
342   #error "lwip_sanity_check: WARNING: TCP_WND is smaller than MSS. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
343 #endif
344 #endif /* LWIP_TCP */
345 #endif /* !LWIP_DISABLE_TCP_SANITY_CHECKS */
346 
347 /**
348  * @ingroup lwip_nosys
349  * Initialize all modules.
350  * Use this in NO_SYS mode. Use tcpip_init() otherwise.
351  */
352 void
lwip_init(void)353 lwip_init(void)
354 {
355 #ifndef LWIP_SKIP_PACKING_CHECK
356   LWIP_ASSERT("Struct packing not implemented correctly. Check your lwIP port.", sizeof(struct packed_struct_test) == PACKED_STRUCT_TEST_EXPECTED_SIZE);
357 #endif
358 
359   /* Modules initialization */
360   stats_init();
361 #if !NO_SYS
362   sys_init();
363 #endif /* !NO_SYS */
364   mem_init();
365   memp_init();
366   pbuf_init();
367   netif_init();
368 #if LWIP_IPV4
369   ip_init();
370 #if LWIP_ARP
371   etharp_init();
372 #endif /* LWIP_ARP */
373 #endif /* LWIP_IPV4 */
374 #if LWIP_RAW
375   raw_init();
376 #endif /* LWIP_RAW */
377 #if LWIP_UDP
378   udp_init();
379 #endif /* LWIP_UDP */
380 #if LWIP_TCP
381   tcp_init();
382 #endif /* LWIP_TCP */
383 #if LWIP_IGMP
384   igmp_init();
385 #endif /* LWIP_IGMP */
386 #if LWIP_DNS
387   dns_init();
388 #endif /* LWIP_DNS */
389 #if PPP_SUPPORT
390   ppp_init();
391 #endif
392 
393 #if LWIP_TIMERS
394   sys_timeouts_init();
395 #endif /* LWIP_TIMERS */
396 }
397