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sicslowpan: abort fragmentation in case the header does not fit the first fragment

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Simon Duquennoy 2018-04-11 04:19:03 -07:00
parent 0c9d2b4049
commit eae1e7eb5a
1 changed files with 9 additions and 0 deletions
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9
os/net/ipv6/sicslowpan.c
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@ -1625,6 +1625,15 @@ output(const linkaddr_t *localdest)
packetbuf_hdr_len += SICSLOWPAN_FRAG1_HDR_LEN;
packetbuf_payload_len = (mac_max_payload - packetbuf_hdr_len) & 0xfffffff8;
LOG_INFO_("(len %d, tag %d)\n", packetbuf_payload_len, frag_tag);
if(packetbuf_payload_len < 0) {
/* The current implementation requires that all headers fit in the first
* fragment. Here is a corner case where the header did fit packetbuf
* but do no longer fit after truncating for a length multiple of 8. */
LOG_WARN("compressed header does not fit first fragment\n");
return 0;
}
memcpy(packetbuf_ptr + packetbuf_hdr_len,
(uint8_t *)UIP_IP_BUF + uncomp_hdr_len, packetbuf_payload_len);
packetbuf_set_datalen(packetbuf_payload_len + packetbuf_hdr_len);