{"action":"created","comment":{"url":"https://api.github.com/repos/RIOT-OS/RIOT/pulls/comments/28948610","id":28948610,"diff_hunk":"@@ -0,0 +1,249 @@\n+/*\n+ * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>\n+ *\n+ * This file is subject to the terms and conditions of the GNU Lesser\n+ * General Public License v2.1. See the file LICENSE in the top level\n+ * directory for more details.\n+ */\n+\n+/**\n+ * @{\n+ *\n+ * @file\n+ */\n+\n+#include \"kernel_types.h\"\n+#include \"net/ng_netbase.h\"\n+#include \"thread.h\"\n+#include \"utlist.h\"\n+\n+#include \"net/ng_sixlowpan.h\"\n+#include \"net/ng_sixlowpan/netif.h\"\n+\n+#define ENABLE_DEBUG    (0)\n+#include \"debug.h\"\n+\n+static kernel_pid_t _sixlowpan_pid = KERNEL_PID_UNDEF;\n+static char _sixlowpan_stack[NG_SIXLOWPAN_STACK_SIZE];\n+\n+void _handle_receive(ng_pktsnip_t *pkt)\n+{\n+    ng_pktsnip_t *payload;\n+    uint8_t *dispatch;\n+    ng_netreg_entry_t *entry;\n+\n+    LL_SEARCH_SCALAR(pkt, payload, type, NG_NETTYPE_SIXLOWPAN);\n+\n+    if ((payload == NULL) || (payload->size < 1)) {\n+        DEBUG(\"6lo: Received packet has no 6LoWPAN payload\\n\");\n+        ng_pktbuf_release(pkt);\n+    }\n+\n+    dispatch = payload->data;\n+\n+    if (dispatch[0] == NG_SIXLOWPAN_UNCOMPRESSED) {\n+        ng_pktsnip_t *sixlowpan;\n+        DEBUG(\"6lo: received uncompressed IPv6 packet\\n\");\n+        payload = ng_pktbuf_start_write(payload);\n+\n+        if (payload == NULL) {\n+            DEBUG(\"6lo: can not get write access on received packet\\n\");\n+#if defined(DEVELHELP) && defined(ENABLE_DEBUG)\n+            ng_pktbuf_stats();\n+#endif\n+            ng_pktbuf_release(pkt);\n+            return;\n+        }\n+\n+        /* packet is uncompressed: just mark and remove the dispatch */\n+        sixlowpan = ng_pktbuf_add(payload, payload->data, sizeof(uint8_t),\n+                                  NG_NETTYPE_SIXLOWPAN);\n+        LL_DELETE(pkt, sixlowpan);\n+        ng_pktbuf_release(sixlowpan);\n+    }\n+    else {\n+        DEBUG(\"6lo: dispatch %02x ... was not recognized\\n\",\n+              dispatch[0]);\n+        ng_pktbuf_release(pkt);\n+        return;\n+    }\n+\n+    payload->type = NG_NETTYPE_IPV6;\n+\n+    entry = ng_netreg_lookup(NG_NETTYPE_IPV6, NG_NETREG_DEMUX_CTX_ALL);\n+\n+    if (entry == NULL) {\n+        DEBUG(\"ipv6: No receivers for this packet found\\n\");\n+        ng_pktbuf_release(pkt);\n+        return;\n+    }\n+\n+    ng_pktbuf_hold(pkt, ng_netreg_num(NG_NETTYPE_IPV6, NG_NETREG_DEMUX_CTX_ALL) - 1);","path":"sys/net/network_layer/ng_sixlowpan/ng_sixlowpan.c","position":100,"original_position":81,"commit_id":"d4cc6e965a7007dadd700a50016036f3844cce30","original_commit_id":"223a1ba96df50c9a54dd60370b9a8c2be1187cb4","user":{"login":"authmillenon","id":675644,"avatar_url":"https://avatars.githubusercontent.com/u/675644?v=3","gravatar_id":"","url":"https://api.github.com/users/authmillenon","html_url":"https://github.com/authmillenon","followers_url":"https://api.github.com/users/authmillenon/followers","following_url":"https://api.github.com/users/authmillenon/following{/other_user}","gists_url":"https://api.github.com/users/authmillenon/gists{/gist_id}","starred_url":"https://api.github.com/users/authmillenon/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/authmillenon/subscriptions","organizations_url":"https://api.github.com/users/authmillenon/orgs","repos_url":"https://api.github.com/users/authmillenon/repos","events_url":"https://api.github.com/users/authmillenon/events{/privacy}","received_events_url":"https://api.github.com/users/authmillenon/received_events","type":"User","site_admin":false},"body":"Just for the record: everywhere else (as it is here) in the new network stack it is assumed, that if you hand the packet over to another thread, you implicitly release all access rights to the packet. Thus you don't need to `_hold` for the first receiver.","created_at":"2015-04-23T09:29:09Z","updated_at":"2015-04-23T09:29:09Z","html_url":"https://github.com/RIOT-OS/RIOT/pull/2614#discussion_r28948610","pull_request_url":"https://api.github.com/repos/RIOT-OS/RIOT/pulls/2614","_links":{"self":{"href":"https://api.github.com/repos/RIOT-OS/RIOT/pulls/comments/28948610"},"html":{"href":"https://github.com/RIOT-OS/RIOT/pull/2614#discussion_r28948610"},"pull_request":{"href":"https://api.github.com/repos/RIOT-OS/RIOT/pulls/2614"}}},"pull_request":{"url":"https://api.github.com/repos/RIOT-OS/RIOT/pulls/2614","id":31262266,"html_url":"https://github.com/RIOT-OS/RIOT/pull/2614","diff_url":"https://github.com/RIOT-OS/RIOT/pull/2614.diff","patch_url":"https://github.com/RIOT-OS/RIOT/pull/2614.patch","issue_url":"https://api.github.com/repos/RIOT-OS/RIOT/issues/2614","number":2614,"state":"open","locked":false,"title":"ng_sixlowpan: initial import","user":{"login":"authmillenon","id":675644,"avatar_url":"https://avatars.githubusercontent.com/u/675644?v=3","gravatar_id":"","url":"https://api.github.com/users/authmillenon","html_url":"https://github.com/authmillenon","followers_url":"https://api.github.com/users/authmillenon/followers","following_url":"https://api.github.com/users/authmillenon/following{/other_user}","gists_url":"https://api.github.com/users/authmillenon/gists{/gist_id}","starred_url":"https://api.github.com/users/authmillenon/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/authmillenon/subscriptions","organizations_url":"https://api.github.com/users/authmillenon/orgs","repos_url":"https://api.github.com/users/authmillenon/repos","events_url":"https://api.github.com/users/authmillenon/events{/privacy}","received_events_url":"https://api.github.com/users/authmillenon/received_events","type":"User","site_admin":false},"body":"~~Depends on #2433 and all its dependencies.~~ (merged)\r\n\r\nThis only implements handling and sending of uncompressed, unfragmented IPv6 packets. The rest will come as a follow-up:\r\n * fragmentation #2781\r\n * IPHC #2806 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