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1 office 1 /**
2 * @file
3 * Ethernet common functions
4 *
5 * @defgroup ethernet Ethernet
6 * @ingroup callbackstyle_api
7 */
8  
9 /*
10 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
11 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
12 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
13 * All rights reserved.
14 *
15 * Redistribution and use in source and binary forms, with or without modification,
16 * are permitted provided that the following conditions are met:
17 *
18 * 1. Redistributions of source code must retain the above copyright notice,
19 * this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright notice,
21 * this list of conditions and the following disclaimer in the documentation
22 * and/or other materials provided with the distribution.
23 * 3. The name of the author may not be used to endorse or promote products
24 * derived from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
29 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
31 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * This file is part of the lwIP TCP/IP stack.
38 *
39 */
40  
41 #include "lwip/opt.h"
42  
43 #if LWIP_ARP || LWIP_ETHERNET
44  
45 #include "netif/ethernet.h"
46 #include "lwip/def.h"
47 #include "lwip/stats.h"
48 #include "lwip/etharp.h"
49 #include "lwip/ip.h"
50 #include "lwip/snmp.h"
51  
52 #include <string.h>
53  
54 #include "netif/ppp/ppp_opts.h"
55 #if PPPOE_SUPPORT
56 #include "netif/ppp/pppoe.h"
57 #endif /* PPPOE_SUPPORT */
58  
59 #ifdef LWIP_HOOK_FILENAME
60 #include LWIP_HOOK_FILENAME
61 #endif
62  
63 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
64 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
65  
66 /**
67 * @ingroup lwip_nosys
68 * Process received ethernet frames. Using this function instead of directly
69 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
70 * the ARP cache is protected from concurrent access.\n
71 * Don't call directly, pass to netif_add() and call netif->input().
72 *
73 * @param p the received packet, p->payload pointing to the ethernet header
74 * @param netif the network interface on which the packet was received
75 *
76 * @see LWIP_HOOK_UNKNOWN_ETH_PROTOCOL
77 * @see ETHARP_SUPPORT_VLAN
78 * @see LWIP_HOOK_VLAN_CHECK
79 */
80 err_t
81 ethernet_input(struct pbuf *p, struct netif *netif)
82 {
83 struct eth_hdr* ethhdr;
84 u16_t type;
85 #if LWIP_ARP || ETHARP_SUPPORT_VLAN || LWIP_IPV6
86 u16_t next_hdr_offset = SIZEOF_ETH_HDR;
87 #endif /* LWIP_ARP || ETHARP_SUPPORT_VLAN */
88  
89 if (p->len <= SIZEOF_ETH_HDR) {
90 /* a packet with only an ethernet header (or less) is not valid for us */
91 ETHARP_STATS_INC(etharp.proterr);
92 ETHARP_STATS_INC(etharp.drop);
93 MIB2_STATS_NETIF_INC(netif, ifinerrors);
94 goto free_and_return;
95 }
96  
97 if (p->if_idx == NETIF_NO_INDEX) {
98 p->if_idx = netif_get_index(netif);
99 }
100  
101 /* points to packet payload, which starts with an Ethernet header */
102 ethhdr = (struct eth_hdr *)p->payload;
103 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
104 ("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n",
105 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
106 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
107 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
108 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
109 lwip_htons(ethhdr->type)));
110  
111 type = ethhdr->type;
112 #if ETHARP_SUPPORT_VLAN
113 if (type == PP_HTONS(ETHTYPE_VLAN)) {
114 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
115 if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
116 /* a packet with only an ethernet/vlan header (or less) is not valid for us */
117 ETHARP_STATS_INC(etharp.proterr);
118 ETHARP_STATS_INC(etharp.drop);
119 MIB2_STATS_NETIF_INC(netif, ifinerrors);
120 goto free_and_return;
121 }
122 #if defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) /* if not, allow all VLANs */
123 #ifdef LWIP_HOOK_VLAN_CHECK
124 if (!LWIP_HOOK_VLAN_CHECK(netif, ethhdr, vlan)) {
125 #elif defined(ETHARP_VLAN_CHECK_FN)
126 if (!ETHARP_VLAN_CHECK_FN(ethhdr, vlan)) {
127 #elif defined(ETHARP_VLAN_CHECK)
128 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
129 #endif
130 /* silently ignore this packet: not for our VLAN */
131 pbuf_free(p);
132 return ERR_OK;
133 }
134 #endif /* defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) */
135 type = vlan->tpid;
136 next_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
137 }
138 #endif /* ETHARP_SUPPORT_VLAN */
139  
140 #if LWIP_ARP_FILTER_NETIF
141 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, lwip_htons(type));
142 #endif /* LWIP_ARP_FILTER_NETIF*/
143  
144 if (ethhdr->dest.addr[0] & 1) {
145 /* this might be a multicast or broadcast packet */
146 if (ethhdr->dest.addr[0] == LL_IP4_MULTICAST_ADDR_0) {
147 #if LWIP_IPV4
148 if ((ethhdr->dest.addr[1] == LL_IP4_MULTICAST_ADDR_1) &&
149 (ethhdr->dest.addr[2] == LL_IP4_MULTICAST_ADDR_2)) {
150 /* mark the pbuf as link-layer multicast */
151 p->flags |= PBUF_FLAG_LLMCAST;
152 }
153 #endif /* LWIP_IPV4 */
154 }
155 #if LWIP_IPV6
156 else if ((ethhdr->dest.addr[0] == LL_IP6_MULTICAST_ADDR_0) &&
157 (ethhdr->dest.addr[1] == LL_IP6_MULTICAST_ADDR_1)) {
158 /* mark the pbuf as link-layer multicast */
159 p->flags |= PBUF_FLAG_LLMCAST;
160 }
161 #endif /* LWIP_IPV6 */
162 else if (eth_addr_cmp(&ethhdr->dest, &ethbroadcast)) {
163 /* mark the pbuf as link-layer broadcast */
164 p->flags |= PBUF_FLAG_LLBCAST;
165 }
166 }
167  
168 switch (type) {
169 #if LWIP_IPV4 && LWIP_ARP
170 /* IP packet? */
171 case PP_HTONS(ETHTYPE_IP):
172 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
173 goto free_and_return;
174 }
175 /* skip Ethernet header */
176 if ((p->len < next_hdr_offset) || pbuf_remove_header(p, next_hdr_offset)) {
177 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
178 ("ethernet_input: IPv4 packet dropped, too short (%"U16_F"/%"U16_F")\n",
179 p->tot_len, next_hdr_offset));
180 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
181 goto free_and_return;
182 } else {
183 /* pass to IP layer */
184 ip4_input(p, netif);
185 }
186 break;
187  
188 case PP_HTONS(ETHTYPE_ARP):
189 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
190 goto free_and_return;
191 }
192 /* skip Ethernet header */
193 if ((p->len < next_hdr_offset) || pbuf_remove_header(p, next_hdr_offset)) {
194 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
195 ("ethernet_input: ARP response packet dropped, too short (%"U16_F"/%"U16_F")\n",
196 p->tot_len, next_hdr_offset));
197 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
198 ETHARP_STATS_INC(etharp.lenerr);
199 ETHARP_STATS_INC(etharp.drop);
200 goto free_and_return;
201 } else {
202 /* pass p to ARP module */
203 etharp_input(p, netif);
204 }
205 break;
206 #endif /* LWIP_IPV4 && LWIP_ARP */
207 #if PPPOE_SUPPORT
208 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
209 pppoe_disc_input(netif, p);
210 break;
211  
212 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
213 pppoe_data_input(netif, p);
214 break;
215 #endif /* PPPOE_SUPPORT */
216  
217 #if LWIP_IPV6
218 case PP_HTONS(ETHTYPE_IPV6): /* IPv6 */
219 /* skip Ethernet header */
220 if ((p->len < next_hdr_offset) || pbuf_remove_header(p, next_hdr_offset)) {
221 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
222 ("ethernet_input: IPv6 packet dropped, too short (%"U16_F"/%"U16_F")\n",
223 p->tot_len, next_hdr_offset));
224 goto free_and_return;
225 } else {
226 /* pass to IPv6 layer */
227 ip6_input(p, netif);
228 }
229 break;
230 #endif /* LWIP_IPV6 */
231  
232 default:
233 #ifdef LWIP_HOOK_UNKNOWN_ETH_PROTOCOL
234 if(LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(p, netif) == ERR_OK) {
235 break;
236 }
237 #endif
238 ETHARP_STATS_INC(etharp.proterr);
239 ETHARP_STATS_INC(etharp.drop);
240 MIB2_STATS_NETIF_INC(netif, ifinunknownprotos);
241 goto free_and_return;
242 }
243  
244 /* This means the pbuf is freed or consumed,
245 so the caller doesn't have to free it again */
246 return ERR_OK;
247  
248 free_and_return:
249 pbuf_free(p);
250 return ERR_OK;
251 }
252  
253 /**
254 * @ingroup ethernet
255 * Send an ethernet packet on the network using netif->linkoutput().
256 * The ethernet header is filled in before sending.
257 *
258 * @see LWIP_HOOK_VLAN_SET
259 *
260 * @param netif the lwIP network interface on which to send the packet
261 * @param p the packet to send. pbuf layer must be @ref PBUF_LINK.
262 * @param src the source MAC address to be copied into the ethernet header
263 * @param dst the destination MAC address to be copied into the ethernet header
264 * @param eth_type ethernet type (@ref eth_type)
265 * @return ERR_OK if the packet was sent, any other err_t on failure
266 */
267 err_t
268 ethernet_output(struct netif* netif, struct pbuf* p,
269 const struct eth_addr* src, const struct eth_addr* dst,
270 u16_t eth_type)
271 {
272 struct eth_hdr* ethhdr;
273 u16_t eth_type_be = lwip_htons(eth_type);
274  
275 #if ETHARP_SUPPORT_VLAN && defined(LWIP_HOOK_VLAN_SET)
276 s32_t vlan_prio_vid = LWIP_HOOK_VLAN_SET(netif, p, src, dst, eth_type);
277 if (vlan_prio_vid >= 0) {
278 struct eth_vlan_hdr* vlanhdr;
279  
280 LWIP_ASSERT("prio_vid must be <= 0xFFFF", vlan_prio_vid <= 0xFFFF);
281  
282 if (pbuf_add_header(p, SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) != 0) {
283 goto pbuf_header_failed;
284 }
285 vlanhdr = (struct eth_vlan_hdr*)(((u8_t*)p->payload) + SIZEOF_ETH_HDR);
286 vlanhdr->tpid = eth_type_be;
287 vlanhdr->prio_vid = lwip_htons((u16_t)vlan_prio_vid);
288  
289 eth_type_be = PP_HTONS(ETHTYPE_VLAN);
290 } else
291 #endif /* ETHARP_SUPPORT_VLAN && defined(LWIP_HOOK_VLAN_SET) */
292 {
293 if (pbuf_add_header(p, SIZEOF_ETH_HDR) != 0) {
294 goto pbuf_header_failed;
295 }
296 }
297  
298 ethhdr = (struct eth_hdr*)p->payload;
299 ethhdr->type = eth_type_be;
300 SMEMCPY(&ethhdr->dest, dst, ETH_HWADDR_LEN);
301 SMEMCPY(&ethhdr->src, src, ETH_HWADDR_LEN);
302  
303 LWIP_ASSERT("netif->hwaddr_len must be 6 for ethernet_output!",
304 (netif->hwaddr_len == ETH_HWADDR_LEN));
305 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
306 ("ethernet_output: sending packet %p\n", (void *)p));
307  
308 /* send the packet */
309 return netif->linkoutput(netif, p);
310  
311 pbuf_header_failed:
312 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
313 ("ethernet_output: could not allocate room for header.\n"));
314 LINK_STATS_INC(link.lenerr);
315 return ERR_BUF;
316 }
317  
318 #endif /* LWIP_ARP || LWIP_ETHERNET */