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gnrc_sixlowpan_frag: msg based fragmentation

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cc430
PeterKietzmann 7 years ago
parent 810c623092
commit 331fa34502
3 changed files with 99 additions and 37 deletions
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28
sys/include/net/gnrc/sixlowpan/frag.h
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@ -1,5 +1,6 @@
/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
* Copyright (C) 2015 Hamburg University of Applied Sciences
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
@ -19,6 +20,7 @@
* @brief 6LoWPAN Fragmentation definitions
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
*/
#ifndef GNRC_SIXLOWPAN_FRAG_H_
#define GNRC_SIXLOWPAN_FRAG_H_
@ -35,17 +37,29 @@
extern "C" {
#endif
/**
* @brief Message type for passing one 6LoWPAN fragment down the network stack
*/
#define GNRC_SIXLOWPAN_MSG_FRAG_SND (0x0225)
/**
* @brief Definition of 6LoWPAN fragmentation type.
*/
typedef struct {
kernel_pid_t pid; /**< PID of the interface */
gnrc_pktsnip_t *pkt; /**< Pointer to the IPv6 packet to be fragmented */
size_t datagram_size; /**< Length of just the IPv6 packet to be fragmented */
uint16_t offset; /**< Offset of the Nth fragment from the beginning of the
* payload datagram */
} gnrc_sixlowpan_msg_frag_t;
/**
* @brief Sends a packet fragmented.
*
* @param[in] pid The interface to send the packet over.
* @param[in] pkt The packet to send.
* @param[in] datagram_size The length of just the IPv6 packet. It is the value
* that the gnrc_sixlowpan_frag_t::disp_size field will be
* set to.
* @param[in] fragment_msg Message containing status of the 6LoWPAN
* fragmentation progress
*/
void gnrc_sixlowpan_frag_send(kernel_pid_t pid, gnrc_pktsnip_t *pkt,
size_t datagram_size);
void gnrc_sixlowpan_frag_send(gnrc_sixlowpan_msg_frag_t *fragment_msg);
/**
* @brief Handles a packet containing a fragment header.

81
sys/net/gnrc/network_layer/sixlowpan/frag/gnrc_sixlowpan_frag.c
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@ -1,5 +1,6 @@
/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
* Copyright (C) 2015 Hamburg University of Applied Sciences
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
@ -10,6 +11,9 @@
* @{
*
* @file
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
*/
#include "kernel_types.h"
@ -212,51 +216,70 @@ static uint16_t _send_nth_fragment(gnrc_sixlowpan_netif_t *iface, gnrc_pktsnip_t
return local_offset;
}
void gnrc_sixlowpan_frag_send(kernel_pid_t pid, gnrc_pktsnip_t *pkt,
size_t datagram_size)
void gnrc_sixlowpan_frag_send(gnrc_sixlowpan_msg_frag_t *fragment_msg)
{
gnrc_sixlowpan_netif_t *iface = gnrc_sixlowpan_netif_get(pid);
uint16_t offset = 0, res;
gnrc_sixlowpan_netif_t *iface = gnrc_sixlowpan_netif_get(fragment_msg->pid);
uint16_t res;
/* payload_len: actual size of the packet vs
* datagram_size: size of the uncompressed IPv6 packet */
size_t payload_len = gnrc_pkt_len(pkt->next);
size_t payload_len = gnrc_pkt_len(fragment_msg->pkt->next);
msg_t msg;
#if defined(DEVELHELP) && defined(ENABLE_DEBUG)
if (iface == NULL) {
DEBUG("6lo frag: iface == NULL, expect segmentation fault.\n");
gnrc_pktbuf_release(pkt);
/* remove original packet from packet buffer */
gnrc_pktbuf_release(fragment_msg->pkt);
/* 6LoWPAN free for next fragmentation */
fragment_msg->pkt = NULL;
return;
}
#endif
if ((res = _send_1st_fragment(iface, pkt, payload_len, datagram_size)) == 0) {
/* error sending first fragment */
DEBUG("6lo frag: error sending 1st fragment\n");
gnrc_pktbuf_release(pkt);
return;
}
offset += res;
thread_yield();
/* (offset + (datagram_size - payload_len) < datagram_size) simplified */
while (offset < payload_len) {
if ((res = _send_nth_fragment(iface, pkt, payload_len, datagram_size,
offset)) == 0) {
/* error sending subsequent fragment */
DEBUG("6lo frag: error sending subsequent fragment (offset = %" PRIu16
")\n", offset);
gnrc_pktbuf_release(pkt);
/* Check weater to send the first or an Nth fragment */
if (fragment_msg->offset == 0) {
/* increment tag for successive, fragmented datagrams */
_tag++;
if ((res = _send_1st_fragment(iface, fragment_msg->pkt, payload_len, fragment_msg->datagram_size)) == 0) {
/* error sending first fragment */
DEBUG("6lo frag: error sending 1st fragment\n");
gnrc_pktbuf_release(fragment_msg->pkt);
fragment_msg->pkt = NULL;
return;
}
fragment_msg->offset += res;
offset += res;
/* send message to self*/
msg.type = GNRC_SIXLOWPAN_MSG_FRAG_SND;
msg.content.ptr = (void *)fragment_msg;
msg_send_to_self(&msg);
thread_yield();
}
/* remove original packet from packet buffer */
gnrc_pktbuf_release(pkt);
_tag++;
else {
/* (offset + (datagram_size - payload_len) < datagram_size) simplified */
if (fragment_msg->offset < payload_len) {
if ((res = _send_nth_fragment(iface, fragment_msg->pkt, payload_len, fragment_msg->datagram_size,
fragment_msg->offset)) == 0) {
/* error sending subsequent fragment */
DEBUG("6lo frag: error sending subsequent fragment (offset = %" PRIu16
")\n", fragment_msg->offset);
gnrc_pktbuf_release(fragment_msg->pkt);
fragment_msg->pkt = NULL;
return;
}
fragment_msg->offset += res;
/* send message to self*/
msg.type = GNRC_SIXLOWPAN_MSG_FRAG_SND;
msg.content.ptr = (void *)fragment_msg;
msg_send_to_self(&msg);
thread_yield();
}
else {
gnrc_pktbuf_release(fragment_msg->pkt);
fragment_msg->pkt = NULL;
}
}
}
void gnrc_sixlowpan_frag_handle_pkt(gnrc_pktsnip_t *pkt)

27
sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c
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@ -34,6 +34,8 @@
static kernel_pid_t _pid = KERNEL_PID_UNDEF;
static gnrc_sixlowpan_msg_frag_t fragment_msg = {KERNEL_PID_UNDEF, NULL, 0, 0};
#if ENABLE_DEBUG
static char _stack[GNRC_SIXLOWPAN_STACK_SIZE + THREAD_EXTRA_STACKSIZE_PRINTF];
#else
@ -270,10 +272,27 @@ static void _send(gnrc_pktsnip_t *pkt)
return;
}
#ifdef MODULE_GNRC_SIXLOWPAN_FRAG
else if (fragment_msg.pkt != NULL) {
DEBUG("6lo: Fragmentation already ongoing. Dropping packet\n");
gnrc_pktbuf_release(pkt2);
return;
}
else if (datagram_size <= SIXLOWPAN_FRAG_MAX_LEN) {
DEBUG("6lo: Send fragmented (%u > %" PRIu16 ")\n",
(unsigned int)datagram_size, iface->max_frag_size);
gnrc_sixlowpan_frag_send(hdr->if_pid, pkt2, datagram_size);
msg_t msg;
fragment_msg.pid = hdr->if_pid;
fragment_msg.pkt = pkt2;
fragment_msg.datagram_size = datagram_size;
/* Sending the first fragment has an offset==0 */
fragment_msg.offset = 0;
/* set the outgoing message's fields */
msg.type = GNRC_SIXLOWPAN_MSG_FRAG_SND;
msg.content.ptr = (void *)&fragment_msg;
/* send message to self */
msg_send_to_self(&msg);
}
else {
DEBUG("6lo: packet too big (%u > %" PRIu16 ")\n",
@ -327,6 +346,12 @@ static void *_event_loop(void *args)
reply.content.value = -ENOTSUP;
msg_reply(&msg, &reply);
break;
#ifdef MODULE_GNRC_SIXLOWPAN_FRAG
case GNRC_SIXLOWPAN_MSG_FRAG_SND:
DEBUG("6lo: send fragmented event received\n");
gnrc_sixlowpan_frag_send((gnrc_sixlowpan_msg_frag_t *)msg.content.ptr);
break;
#endif
default:
DEBUG("6lo: operation not supported\n");

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