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Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/core/raw.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/core/raw.c | 521 |
1 files changed, 521 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/core/raw.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/core/raw.c new file mode 100644 index 0000000..80cf9ec --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/core/raw.c @@ -0,0 +1,521 @@ +/** + * @file + * Implementation of raw protocol PCBs for low-level handling of + * different types of protocols besides (or overriding) those + * already available in lwIP.\n + * See also @ref raw_raw + * + * @defgroup raw_raw RAW + * @ingroup callbackstyle_api + * Implementation of raw protocol PCBs for low-level handling of + * different types of protocols besides (or overriding) those + * already available in lwIP.\n + * @see @ref raw_api + */ + +/* + * Copyright (c) 2001-2004 Swedish Institute of Computer Science. + * 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. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + * + * This file is part of the lwIP TCP/IP stack. + * + * Author: Adam Dunkels <adam@sics.se> + * + */ + +#include "lwip/opt.h" + +#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */ + +#include "lwip/def.h" +#include "lwip/memp.h" +#include "lwip/ip_addr.h" +#include "lwip/netif.h" +#include "lwip/raw.h" +#include "lwip/stats.h" +#include "lwip/ip6.h" +#include "lwip/ip6_addr.h" +#include "lwip/inet_chksum.h" + +#include <string.h> + +/** The list of RAW PCBs */ +static struct raw_pcb *raw_pcbs; + +static u8_t +raw_input_match(struct raw_pcb *pcb, u8_t broadcast) +{ + LWIP_UNUSED_ARG(broadcast); /* in IPv6 only case */ + +#if LWIP_IPV4 && LWIP_IPV6 + /* Dual-stack: PCBs listening to any IP type also listen to any IP address */ + if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) { +#if IP_SOF_BROADCAST_RECV + if ((broadcast != 0) && !ip_get_option(pcb, SOF_BROADCAST)) { + return 0; + } +#endif /* IP_SOF_BROADCAST_RECV */ + return 1; + } +#endif /* LWIP_IPV4 && LWIP_IPV6 */ + + /* Only need to check PCB if incoming IP version matches PCB IP version */ + if (IP_ADDR_PCB_VERSION_MATCH_EXACT(pcb, ip_current_dest_addr())) { +#if LWIP_IPV4 + /* Special case: IPv4 broadcast: receive all broadcasts + * Note: broadcast variable can only be 1 if it is an IPv4 broadcast */ + if (broadcast != 0) { +#if IP_SOF_BROADCAST_RECV + if (ip_get_option(pcb, SOF_BROADCAST)) +#endif /* IP_SOF_BROADCAST_RECV */ + { + if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip))) { + return 1; + } + } + } else +#endif /* LWIP_IPV4 */ + /* Handle IPv4 and IPv6: catch all or exact match */ + if (ip_addr_isany(&pcb->local_ip) || + ip_addr_cmp(&pcb->local_ip, ip_current_dest_addr())) { + return 1; + } + } + + return 0; +} + +/** + * Determine if in incoming IP packet is covered by a RAW PCB + * and if so, pass it to a user-provided receive callback function. + * + * Given an incoming IP datagram (as a chain of pbufs) this function + * finds a corresponding RAW PCB and calls the corresponding receive + * callback function. + * + * @param p pbuf to be demultiplexed to a RAW PCB. + * @param inp network interface on which the datagram was received. + * @return - 1 if the packet has been eaten by a RAW PCB receive + * callback function. The caller MAY NOT not reference the + * packet any longer, and MAY NOT call pbuf_free(). + * @return - 0 if packet is not eaten (pbuf is still referenced by the + * caller). + * + */ +u8_t +raw_input(struct pbuf *p, struct netif *inp) +{ + struct raw_pcb *pcb, *prev; + s16_t proto; + u8_t eaten = 0; + u8_t broadcast = ip_addr_isbroadcast(ip_current_dest_addr(), ip_current_netif()); + + LWIP_UNUSED_ARG(inp); + +#if LWIP_IPV6 +#if LWIP_IPV4 + if (IP_HDR_GET_VERSION(p->payload) == 6) +#endif /* LWIP_IPV4 */ + { + struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload; + proto = IP6H_NEXTH(ip6hdr); + } +#if LWIP_IPV4 + else +#endif /* LWIP_IPV4 */ +#endif /* LWIP_IPV6 */ +#if LWIP_IPV4 + { + proto = IPH_PROTO((struct ip_hdr *)p->payload); + } +#endif /* LWIP_IPV4 */ + + prev = NULL; + pcb = raw_pcbs; + /* loop through all raw pcbs until the packet is eaten by one */ + /* this allows multiple pcbs to match against the packet by design */ + while ((eaten == 0) && (pcb != NULL)) { + if ((pcb->protocol == proto) && raw_input_match(pcb, broadcast)) { + /* receive callback function available? */ + if (pcb->recv != NULL) { +#ifndef LWIP_NOASSERT + void* old_payload = p->payload; +#endif + /* the receive callback function did not eat the packet? */ + eaten = pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()); + if (eaten != 0) { + /* receive function ate the packet */ + p = NULL; + eaten = 1; + if (prev != NULL) { + /* move the pcb to the front of raw_pcbs so that is + found faster next time */ + prev->next = pcb->next; + pcb->next = raw_pcbs; + raw_pcbs = pcb; + } + } else { + /* sanity-check that the receive callback did not alter the pbuf */ + LWIP_ASSERT("raw pcb recv callback altered pbuf payload pointer without eating packet", + p->payload == old_payload); + } + } + /* no receive callback function was set for this raw PCB */ + } + /* drop the packet */ + prev = pcb; + pcb = pcb->next; + } + return eaten; +} + +/** + * @ingroup raw_raw + * Bind a RAW PCB. + * + * @param pcb RAW PCB to be bound with a local address ipaddr. + * @param ipaddr local IP address to bind with. Use IP4_ADDR_ANY to + * bind to all local interfaces. + * + * @return lwIP error code. + * - ERR_OK. Successful. No error occurred. + * - ERR_USE. The specified IP address is already bound to by + * another RAW PCB. + * + * @see raw_disconnect() + */ +err_t +raw_bind(struct raw_pcb *pcb, const ip_addr_t *ipaddr) +{ + if ((pcb == NULL) || (ipaddr == NULL)) { + return ERR_VAL; + } + ip_addr_set_ipaddr(&pcb->local_ip, ipaddr); + return ERR_OK; +} + +/** + * @ingroup raw_raw + * Connect an RAW PCB. This function is required by upper layers + * of lwip. Using the raw api you could use raw_sendto() instead + * + * This will associate the RAW PCB with the remote address. + * + * @param pcb RAW PCB to be connected with remote address ipaddr and port. + * @param ipaddr remote IP address to connect with. + * + * @return lwIP error code + * + * @see raw_disconnect() and raw_sendto() + */ +err_t +raw_connect(struct raw_pcb *pcb, const ip_addr_t *ipaddr) +{ + if ((pcb == NULL) || (ipaddr == NULL)) { + return ERR_VAL; + } + ip_addr_set_ipaddr(&pcb->remote_ip, ipaddr); + return ERR_OK; +} + +/** + * @ingroup raw_raw + * Set the callback function for received packets that match the + * raw PCB's protocol and binding. + * + * The callback function MUST either + * - eat the packet by calling pbuf_free() and returning non-zero. The + * packet will not be passed to other raw PCBs or other protocol layers. + * - not free the packet, and return zero. The packet will be matched + * against further PCBs and/or forwarded to another protocol layers. + */ +void +raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg) +{ + /* remember recv() callback and user data */ + pcb->recv = recv; + pcb->recv_arg = recv_arg; +} + +/** + * @ingroup raw_raw + * Send the raw IP packet to the given address. Note that actually you cannot + * modify the IP headers (this is inconsistent with the receive callback where + * you actually get the IP headers), you can only specify the IP payload here. + * It requires some more changes in lwIP. (there will be a raw_send() function + * then.) + * + * @param pcb the raw pcb which to send + * @param p the IP payload to send + * @param ipaddr the destination address of the IP packet + * + */ +err_t +raw_sendto(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr) +{ + err_t err; + struct netif *netif; + const ip_addr_t *src_ip; + struct pbuf *q; /* q will be sent down the stack */ + s16_t header_size; + + if ((pcb == NULL) || (ipaddr == NULL) || !IP_ADDR_PCB_VERSION_MATCH(pcb, ipaddr)) { + return ERR_VAL; + } + + LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n")); + + header_size = ( +#if LWIP_IPV4 && LWIP_IPV6 + IP_IS_V6(ipaddr) ? IP6_HLEN : IP_HLEN); +#elif LWIP_IPV4 + IP_HLEN); +#else + IP6_HLEN); +#endif + + /* not enough space to add an IP header to first pbuf in given p chain? */ + if (pbuf_header(p, header_size)) { + /* allocate header in new pbuf */ + q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM); + /* new header pbuf could not be allocated? */ + if (q == NULL) { + LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n")); + return ERR_MEM; + } + if (p->tot_len != 0) { + /* chain header q in front of given pbuf p */ + pbuf_chain(q, p); + } + /* { first pbuf q points to header pbuf } */ + LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p)); + } else { + /* first pbuf q equals given pbuf */ + q = p; + if (pbuf_header(q, -header_size)) { + LWIP_ASSERT("Can't restore header we just removed!", 0); + return ERR_MEM; + } + } + + if(IP_IS_ANY_TYPE_VAL(pcb->local_ip)) { + /* Don't call ip_route() with IP_ANY_TYPE */ + netif = ip_route(IP46_ADDR_ANY(IP_GET_TYPE(ipaddr)), ipaddr); + } else { + netif = ip_route(&pcb->local_ip, ipaddr); + } + + if (netif == NULL) { + LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to ")); + ip_addr_debug_print(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ipaddr); + /* free any temporary header pbuf allocated by pbuf_header() */ + if (q != p) { + pbuf_free(q); + } + return ERR_RTE; + } + +#if IP_SOF_BROADCAST + if (IP_IS_V4(ipaddr)) + { + /* broadcast filter? */ + if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(ipaddr, netif)) { + LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb)); + /* free any temporary header pbuf allocated by pbuf_header() */ + if (q != p) { + pbuf_free(q); + } + return ERR_VAL; + } + } +#endif /* IP_SOF_BROADCAST */ + + if (ip_addr_isany(&pcb->local_ip)) { + /* use outgoing network interface IP address as source address */ + src_ip = ip_netif_get_local_ip(netif, ipaddr); +#if LWIP_IPV6 + if (src_ip == NULL) { + if (q != p) { + pbuf_free(q); + } + return ERR_RTE; + } +#endif /* LWIP_IPV6 */ + } else { + /* use RAW PCB local IP address as source address */ + src_ip = &pcb->local_ip; + } + +#if LWIP_IPV6 + /* If requested, based on the IPV6_CHECKSUM socket option per RFC3542, + compute the checksum and update the checksum in the payload. */ + if (IP_IS_V6(ipaddr) && pcb->chksum_reqd) { + u16_t chksum = ip6_chksum_pseudo(p, pcb->protocol, p->tot_len, ip_2_ip6(src_ip), ip_2_ip6(ipaddr)); + LWIP_ASSERT("Checksum must fit into first pbuf", p->len >= (pcb->chksum_offset + 2)); + SMEMCPY(((u8_t *)p->payload) + pcb->chksum_offset, &chksum, sizeof(u16_t)); + } +#endif + + NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint); + err = ip_output_if(q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif); + NETIF_SET_HWADDRHINT(netif, NULL); + + /* did we chain a header earlier? */ + if (q != p) { + /* free the header */ + pbuf_free(q); + } + return err; +} + +/** + * @ingroup raw_raw + * Send the raw IP packet to the address given by raw_connect() + * + * @param pcb the raw pcb which to send + * @param p the IP payload to send + * + */ +err_t +raw_send(struct raw_pcb *pcb, struct pbuf *p) +{ + return raw_sendto(pcb, p, &pcb->remote_ip); +} + +/** + * @ingroup raw_raw + * Remove an RAW PCB. + * + * @param pcb RAW PCB to be removed. The PCB is removed from the list of + * RAW PCB's and the data structure is freed from memory. + * + * @see raw_new() + */ +void +raw_remove(struct raw_pcb *pcb) +{ + struct raw_pcb *pcb2; + /* pcb to be removed is first in list? */ + if (raw_pcbs == pcb) { + /* make list start at 2nd pcb */ + raw_pcbs = raw_pcbs->next; + /* pcb not 1st in list */ + } else { + for (pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) { + /* find pcb in raw_pcbs list */ + if (pcb2->next != NULL && pcb2->next == pcb) { + /* remove pcb from list */ + pcb2->next = pcb->next; + break; + } + } + } + memp_free(MEMP_RAW_PCB, pcb); +} + +/** + * @ingroup raw_raw + * Create a RAW PCB. + * + * @return The RAW PCB which was created. NULL if the PCB data structure + * could not be allocated. + * + * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP) + * + * @see raw_remove() + */ +struct raw_pcb * +raw_new(u8_t proto) +{ + struct raw_pcb *pcb; + + LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n")); + + pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB); + /* could allocate RAW PCB? */ + if (pcb != NULL) { + /* initialize PCB to all zeroes */ + memset(pcb, 0, sizeof(struct raw_pcb)); + pcb->protocol = proto; + pcb->ttl = RAW_TTL; + pcb->next = raw_pcbs; + raw_pcbs = pcb; + } + return pcb; +} + +/** + * @ingroup raw_raw + * Create a RAW PCB for specific IP type. + * + * @return The RAW PCB which was created. NULL if the PCB data structure + * could not be allocated. + * + * @param type IP address type, see @ref lwip_ip_addr_type definitions. + * If you want to listen to IPv4 and IPv6 (dual-stack) packets, + * supply @ref IPADDR_TYPE_ANY as argument and bind to @ref IP_ANY_TYPE. + * @param proto the protocol number (next header) of the IPv6 packet payload + * (e.g. IP6_NEXTH_ICMP6) + * + * @see raw_remove() + */ +struct raw_pcb * +raw_new_ip_type(u8_t type, u8_t proto) +{ + struct raw_pcb *pcb; + pcb = raw_new(proto); +#if LWIP_IPV4 && LWIP_IPV6 + if (pcb != NULL) { + IP_SET_TYPE_VAL(pcb->local_ip, type); + IP_SET_TYPE_VAL(pcb->remote_ip, type); + } +#else /* LWIP_IPV4 && LWIP_IPV6 */ + LWIP_UNUSED_ARG(type); +#endif /* LWIP_IPV4 && LWIP_IPV6 */ + return pcb; +} + +/** This function is called from netif.c when address is changed + * + * @param old_addr IP address of the netif before change + * @param new_addr IP address of the netif after change + */ +void raw_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr) +{ + struct raw_pcb* rpcb; + + if (!ip_addr_isany(old_addr) && !ip_addr_isany(new_addr)) { + for (rpcb = raw_pcbs; rpcb != NULL; rpcb = rpcb->next) { + /* PCB bound to current local interface address? */ + if (ip_addr_cmp(&rpcb->local_ip, old_addr)) { + /* The PCB is bound to the old ipaddr and + * is set to bound to the new one instead */ + ip_addr_copy(rpcb->local_ip, *new_addr); + } + } + } +} + +#endif /* LWIP_RAW */ |