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gnrc_sixlowpan_iphc: factor encoding out of sending function

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This commit is contained in:
Martine S. Lenders 2019-11-01 18:55:21 +01:00
parent 556d71a7da
commit e31394536b
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GPG Key ID: CCD317364F63286F
1 changed files with 29 additions and 18 deletions
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47
sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c
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@ -116,6 +116,10 @@ static inline bool _context_overlaps_iid(gnrc_sixlowpan_ctx_t *ctx,
(iid->uint8[(ctx->prefix_len / 8) - 8] & byte_mask[ctx->prefix_len % 8])));
}
static gnrc_pktsnip_t *_iphc_encode(gnrc_pktsnip_t *pkt,
const gnrc_netif_hdr_t *netif_hdr,
gnrc_netif_t *netif);
#ifdef MODULE_GNRC_SIXLOWPAN_IPHC_NHC
/**
* @brief Decodes UDP NHC
@ -705,22 +709,19 @@ static inline bool _compressible(gnrc_pktsnip_t *hdr)
}
}
void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
static gnrc_pktsnip_t *_iphc_encode(gnrc_pktsnip_t *pkt,
const gnrc_netif_hdr_t *netif_hdr,
gnrc_netif_t *iface)
{
assert(pkt != NULL);
gnrc_netif_hdr_t *netif_hdr = pkt->data;
ipv6_hdr_t *ipv6_hdr;
gnrc_netif_t *iface = gnrc_netif_hdr_get_netif(netif_hdr);
uint8_t *iphc_hdr;
gnrc_sixlowpan_ctx_t *src_ctx = NULL, *dst_ctx = NULL;
gnrc_pktsnip_t *dispatch, *ptr = pkt->next;
bool addr_comp = false;
size_t dispatch_size = 0;
/* datagram size before compression */
size_t orig_datagram_size = gnrc_pkt_len(pkt->next);
uint16_t inline_pos = SIXLOWPAN_IPHC_HDR_LEN;
(void)ctx;
assert(iface != NULL);
dispatch = NULL; /* use dispatch as temporary pointer for prev */
/* determine maximum dispatch size and write protect all headers until
@ -730,10 +731,7 @@ void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
if (tmp == NULL) {
DEBUG("6lo iphc: unable to write protect compressible header\n");
if (addr_comp) { /* addr_comp was used as release indicator */
gnrc_pktbuf_release(pkt);
}
return;
return NULL;
}
ptr = tmp;
if (dispatch == NULL) {
@ -766,8 +764,7 @@ void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
if (dispatch == NULL) {
DEBUG("6lo iphc: error allocating dispatch space\n");
gnrc_pktbuf_release(pkt);
return;
return NULL;
}
iphc_hdr = dispatch->data;
@ -894,8 +891,7 @@ void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
if (gnrc_netif_ipv6_get_iid(iface, &iid) < 0) {
DEBUG("6lo iphc: could not get interface's IID\n");
gnrc_netif_release(iface);
gnrc_pktbuf_release(pkt);
return;
return NULL;
}
gnrc_netif_release(iface);
@ -1013,8 +1009,7 @@ void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
if (gnrc_netif_hdr_ipv6_iid_from_dst(iface, netif_hdr, &iid) < 0) {
DEBUG("6lo iphc: could not get destination's IID\n");
gnrc_pktbuf_release(pkt);
return;
return NULL;
}
if ((ipv6_hdr->dst.u64[1].u64 == iid.uint64.u64) ||
@ -1062,7 +1057,7 @@ void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
if (udp == NULL) {
DEBUG("gnrc_sixlowpan_iphc_encode: unable to mark UDP header\n");
gnrc_pktbuf_release(dispatch);
return;
return NULL;
}
}
gnrc_pktbuf_remove_snip(pkt, udp);
@ -1083,8 +1078,24 @@ void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
/* insert dispatch into packet */
dispatch->next = pkt->next;
pkt->next = dispatch;
return pkt;
}
gnrc_sixlowpan_multiplex_by_size(pkt, orig_datagram_size, iface, page);
void gnrc_sixlowpan_iphc_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
{
gnrc_netif_hdr_t *netif_hdr = pkt->data;
gnrc_netif_t *netif = gnrc_netif_hdr_get_netif(netif_hdr);
gnrc_pktsnip_t *tmp;
/* datagram size before compression */
size_t orig_datagram_size = gnrc_pkt_len(pkt->next);
(void)ctx;
if ((tmp = _iphc_encode(pkt, pkt->data, netif))) {
gnrc_sixlowpan_multiplex_by_size(tmp, orig_datagram_size, netif, page);
}
else {
gnrc_pktbuf_release(pkt);
}
}
/** @} */