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uIP6: check MTU, check and update TTL even in the case of routing header forwarding

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Simon Duquennoy 2017-11-11 14:48:20 +01:00 committed by Simon Duquennoy
parent 54f2cbe6ab
commit 071f542078
1 changed files with 25 additions and 0 deletions
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25
os/net/ipv6/uip6.c
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@ -1358,6 +1358,31 @@ uip_process(uint8_t flag)
if(UIP_ROUTING_BUF->seg_left > 0) {
#if UIP_CONF_IPV6_RPL && RPL_WITH_NON_STORING
if(rpl_ext_header_srh_update()) {
/* With routing header, the detination address is us and will
* be swapped later to the next hop. Because of this, the MTU
* and TTL were not checked and updated yet. Do this now. */
/* Check MTU */
if(uip_len > UIP_LINK_MTU) {
uip_icmp6_error_output(ICMP6_PACKET_TOO_BIG, 0, UIP_LINK_MTU);
UIP_STAT(++uip_stat.ip.drop);
goto send;
}
/* Check Hop Limit */
if(UIP_IP_BUF->ttl <= 1) {
uip_icmp6_error_output(ICMP6_TIME_EXCEEDED,
ICMP6_TIME_EXCEED_TRANSIT, 0);
UIP_STAT(++uip_stat.ip.drop);
goto send;
}
UIP_IP_BUF->ttl = UIP_IP_BUF->ttl - 1;
LOG_INFO("Forwarding packet to ");
LOG_INFO_6ADDR(&UIP_IP_BUF->destipaddr);
LOG_INFO_("\n");
UIP_STAT(++uip_stat.ip.forwarded);
goto send; /* Proceed to forwarding */
}
#endif /* UIP_CONF_IPV6_RPL && RPL_WITH_NON_STORING */