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Merge pull request #1855 from MohamedSeliem/patch-5

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DAD: Remove useless "if" that tests if the source address is unspecified
This commit is contained in:
Nicolas Tsiftes 2016-12-08 20:08:59 +01:00 committed by GitHub
commit 1249d9cf8d
2 changed files with 23 additions and 29 deletions
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28
core/net/ipv6/uip-nd6.c
View File

@ -157,7 +157,27 @@ create_llao(uint8_t *llao, uint8_t type) {
}
/*------------------------------------------------------------------*/
/**
* Neighbor Solicitation Processing
*
* The NS can be received in 3 cases (procedures):
* - sender is performing DAD (ip src = unspecified, no SLLAO option)
* - sender is performing NUD (ip dst = unicast)
* - sender is performing address resolution (ip dest = solicited node mcast
* address)
*
* We do:
* - if the tgt belongs to me, reply, otherwise ignore
* - if i was performing DAD for the same address, two cases:
* -- I already sent a NS, hence I win
* -- I did not send a NS yet, hence I lose
*
* If we need to send a NA in response (i.e. the NS was done for NUD, or
* address resolution, or DAD and there is a conflict), we do it in this
* function: set src, dst, tgt address in the three cases, then for all cases
* set the rest, including SLLAO
*
*/
#if UIP_ND6_SEND_NA
static void
ns_input(void)
@ -238,9 +258,9 @@ ns_input(void)
addr = uip_ds6_addr_lookup(&UIP_ND6_NS_BUF->tgtipaddr);
if(addr != NULL) {
#if UIP_ND6_DEF_MAXDADNS > 0
if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)) {
/* DAD CASE */
#if UIP_ND6_DEF_MAXDADNS > 0
#if UIP_CONF_IPV6_CHECKS
if(!uip_is_addr_solicited_node(&UIP_IP_BUF->destipaddr)) {
PRINTF("NS received is bad\n");
@ -258,9 +278,7 @@ ns_input(void)
goto discard;
}
#else /* UIP_ND6_DEF_MAXDADNS > 0 */
if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)) {
/* DAD CASE */
goto discard;
goto discard; /* DAD CASE */
#endif /* UIP_ND6_DEF_MAXDADNS > 0 */
}
#if UIP_CONF_IPV6_CHECKS

24
core/net/ipv6/uip-nd6.h
View File

@ -336,30 +336,6 @@ typedef struct uip_nd6_opt_redirected_hdr {
* @{
*/
/**
* \brief Process a neighbor solicitation
*
* The NS can be received in 3 cases (procedures):
* - sender is performing DAD (ip src = unspecified, no SLLAO option)
* - sender is performing NUD (ip dst = unicast)
* - sender is performing address resolution (ip dest = solicited node mcast
* address)
*
* We do:
* - if the tgt belongs to me, reply, otherwise ignore
* - if i was performing DAD for the same address, two cases:
* -- I already sent a NS, hence I win
* -- I did not send a NS yet, hence I lose
*
* If we need to send a NA in response (i.e. the NS was done for NUD, or
* address resolution, or DAD and there is a conflict), we do it in this
* function: set src, dst, tgt address in the three cases, then for all cases
* set the rest, including SLLAO
*
*/
void
uip_nd6_ns_input(void);
/**
* \brief Send a neighbor solicitation, send a Neighbor Advertisement
* \param src pointer to the src of the NS if known
* \param dest pointer to ip address to send the NS, for DAD or ADDR Resol,