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Drop packet if there are not enough free buffers to perform fragmentation

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This commit is contained in:
Laurent Deru 2013-09-02 16:19:08 +02:00
parent 8b72ab49c0
commit 68b9412776
5 changed files with 34 additions and 1 deletions
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13
core/lib/memb.c
View File

@ -107,5 +107,18 @@ memb_inmemb(struct memb *m, void *ptr)
(char *)ptr < (char *)m->mem + (m->num * m->size);
}
/*---------------------------------------------------------------------------*/
int
memb_numfree(struct memb *m)
{
int i;
int num_free = 0;
for(i = 0; i < m->num; ++i) {
if(m->count[i] == 0) {
++num_free;
}
}
return num_free;
}
/** @} */

1
core/lib/memb.h
View File

@ -130,6 +130,7 @@ char memb_free(struct memb *m, void *ptr);
int memb_inmemb(struct memb *m, void *ptr);
int memb_numfree(struct memb *m);
/** @} */
/** @} */

7
core/net/ipv6/sicslowpan.c
View File

@ -1454,6 +1454,13 @@ output(const uip_lladdr_t *localdest)
* IPv6/HC1/HC06/HC_UDP dispatchs/headers.
* The following fragments contain only the fragn dispatch.
*/
int estimated_fragments = ((int)uip_len) / ((int)MAC_MAX_PAYLOAD - SICSLOWPAN_FRAGN_HDR_LEN) + 1;
int freebuf = queuebuf_numfree() - 1;
PRINTFO("uip_len: %d, fragments: %d, free bufs: %d\n", uip_len, estimated_fragments, freebuf);
if(freebuf < estimated_fragments) {
PRINTFO("Dropping packet, not enough free bufs\n");
return 0;
}
PRINTFO("Fragmentation sending packet len %d\n", uip_len);

10
core/net/queuebuf.c
View File

@ -307,6 +307,16 @@ queuebuf_init(void)
#endif /* QUEUEBUF_STATS */
}
/*---------------------------------------------------------------------------*/
int
queuebuf_numfree(void)
{
if(packetbuf_is_reference()) {
return memb_numfree(&refbufmem);
} else {
return memb_numfree(&bufmem);
}
}
/*---------------------------------------------------------------------------*/
#if QUEUEBUF_DEBUG
struct queuebuf *
queuebuf_new_from_packetbuf_debug(const char *file, int line)

4
core/net/queuebuf.h
View File

@ -108,7 +108,9 @@ packetbuf_attr_t queuebuf_attr(struct queuebuf *b, uint8_t type);
void queuebuf_debug_print(void);
#endif /* QUEUEBUF_H_ */
int queuebuf_numfree(void);
#endif /* __QUEUEBUF_H__ */
/** @} */
/** @} */