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nd6: centralize link-local packet send decision

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Previously, ethip6 and lowpan6 each had their own copy of code that
used internal nd6 data structures to decide whether to send a packet
on the local link right away, or queue it while nd6 performed local
address resolution.  This patch moves that code into nd6, thereby
eliminating all remaining cases of external access to internal nd6
data structures, as well as the need to expose two specific nd6
functions.

As a side effect, the patch effectively fixes two bugs in the lowpan6
code that were already fixed in the ethip6 code.
This commit is contained in:
David van Moolenbroek
2016-12-14 16:19:24 +00:00
committed by sg
parent 06ff89cbe4
commit 69a7039f75
4 changed files with 90 additions and 54 deletions
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3
src/include/lwip/nd6.h
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@@ -142,10 +142,9 @@ extern u32_t retrans_timer;
void nd6_tmr(void);
void nd6_input(struct pbuf *p, struct netif *inp);
void nd6_clear_destination_cache(void);
s8_t nd6_get_next_hop_entry(const ip6_addr_t *ip6addr, struct netif *netif);
struct netif *nd6_find_route(const ip6_addr_t *ip6addr);
err_t nd6_packet_send_check(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr, const u8_t **hwaddrp);
u16_t nd6_get_destination_mtu(const ip6_addr_t *ip6addr, struct netif *netif);
err_t nd6_queue_packet(s8_t neighbor_index, struct pbuf *p);
#if LWIP_ND6_TCP_REACHABILITY_HINTS
void nd6_reachability_hint(const ip6_addr_t *ip6addr);
#endif /* LWIP_ND6_TCP_REACHABILITY_HINTS */