shell_commands: provide command for 6Lo context administration

sys/shell/commands/Makefile

@@ -56,6 +56,11 @@ endif
 ifneq (,$(filter gnrc_rpl,$(USEMODULE)))
     SRC += sc_gnrc_rpl.c
 endif
+ifneq (,$(filter gnrc_sixlowpan_ctx,$(USEMODULE)))
+ifneq (,$(filter gnrc_sixlowpan_nd_border_router,$(USEMODULE)))
+    SRC += sc_gnrc_6ctx.c
+endif
+endif
 
 # TODO
 # Conditional building not possible at the moment due to

sys/shell/commands/sc_gnrc_6ctx.c

@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "net/ipv6/addr.h"
+#include "net/gnrc/ipv6/netif.h"
+#include "net/gnrc/ndp/internal.h"
+#include "net/gnrc/sixlowpan/ctx.h"
+#include "net/gnrc/sixlowpan/nd.h"
+#include "timex.h"
+#include "xtimer.h"
+
+static xtimer_t del_timer[GNRC_SIXLOWPAN_CTX_SIZE];
+static gnrc_sixlowpan_nd_router_abr_t *abr = NULL;
+
+void _del_cb(void *ptr)
+{
+    gnrc_sixlowpan_ctx_t *ctx = ptr;
+    uint8_t cid = ctx->flags_id & GNRC_SIXLOWPAN_CTX_FLAGS_CID_MASK;
+    ctx->prefix_len = 0;
+    gnrc_sixlowpan_nd_router_abr_rem_ctx(abr, cid);
+    del_timer[cid].callback = NULL;
+}
+
+static void _usage(char *cmd_str)
+{
+    printf("usage: %s [{add <0-15> <prefix>/<prefix_len> <ltime in min>|del <ctx>}]\n", cmd_str);
+    puts("       `del` will only invalidate the context for compression. It can be");
+    puts("       reassigned after 5 min.");
+}
+
+int _gnrc_6ctx_list(void)
+{
+    puts("cid|prefix                                     |C|ltime");
+    puts("-----------------------------------------------------------");
+    for (uint8_t i = 0; i < GNRC_SIXLOWPAN_CTX_SIZE; i++) {
+        gnrc_sixlowpan_ctx_t *ctx = gnrc_sixlowpan_ctx_lookup_id(i);
+        if (ctx != NULL) {
+            char addr_str[IPV6_ADDR_MAX_STR_LEN];
+            printf(" %2" PRIu8 "|%39s/%-3" PRIu8 "|%" PRIx8 "|%5" PRIu16 " min\n", i,
+                   ipv6_addr_to_str(addr_str, &ctx->prefix, sizeof(addr_str)), ctx->prefix_len,
+                   (ctx->flags_id & 0xf0) >> 4, ctx->ltime);
+        }
+    }
+    return 0;
+}
+
+static void _adv_ctx(void)
+{
+    kernel_pid_t ifs[GNRC_NETIF_NUMOF];
+    size_t ifnum = gnrc_netif_get(ifs);
+    for (size_t i = 0; i < ifnum; i++) {
+        gnrc_ipv6_netif_t *iface = gnrc_ipv6_netif_get(ifs[i]);
+        if ((iface != NULL) && (iface->flags & GNRC_IPV6_NETIF_FLAGS_SIXLOWPAN)) {
+            gnrc_ndp_internal_send_rtr_adv(ifs[i], NULL, NULL, false);
+        }
+    }
+}
+
+int _gnrc_6ctx_add(char *cmd_str, char *ctx_str, char *prefix_str, char *ltime_str)
+{
+    ipv6_addr_t prefix;
+    char *addr_str, *prefix_len_str, *save_ptr;
+    unsigned prefix_len;
+    unsigned ltime;
+    unsigned ctx = (unsigned)atoi(ctx_str);
+    if (ctx >= GNRC_SIXLOWPAN_CTX_SIZE) {
+        _usage(cmd_str);
+        return 1;
+    }
+    addr_str = strtok_r(prefix_str, "/", &save_ptr);
+    if (addr_str == NULL) {
+        _usage(cmd_str);
+        return 1;
+    }
+    prefix_len_str = strtok_r(NULL, "/", &save_ptr);
+    if (addr_str == NULL) {
+        _usage(cmd_str);
+        return 1;
+    }
+    prefix_len = (unsigned)atoi(prefix_len_str);
+    if ((prefix_len - 1U) > 128U) {
+        puts("ERROR: prefix_len < 1 || prefix_len > 128");
+        return 1;
+    }
+    ipv6_addr_from_str(&prefix, addr_str);
+    if (ipv6_addr_is_unspecified(&prefix)) {
+        puts("ERROR: prefix may not be ::");
+        return 1;
+    }
+    if (abr == NULL) {
+        abr = gnrc_sixlowpan_nd_router_abr_get();
+    }
+    if (gnrc_sixlowpan_nd_router_abr_add_ctx(abr, ctx) < 0) {
+        puts("ERROR: can not add context");
+        return 1;
+    }
+    ltime = (unsigned)atoi(ltime_str);
+    if (gnrc_sixlowpan_ctx_update((uint8_t)ctx, &prefix, (uint8_t)prefix_len, ltime,
+                                  true) == NULL) {
+        puts("ERROR: can not add context");
+        return 1;
+    }
+    /* advertise new/updated context */
+    _adv_ctx();
+    return 0;
+}
+
+int _gnrc_6ctx_del(char *cmd_str, char *ctx_str)
+{
+    gnrc_sixlowpan_ctx_t *ctx;
+    unsigned cid = (unsigned)atoi(ctx_str);
+    if (cid >= GNRC_SIXLOWPAN_CTX_SIZE) {
+        _usage(cmd_str);
+        return 1;
+    }
+    else if (del_timer[cid].callback == NULL) {
+        ctx = gnrc_sixlowpan_ctx_lookup_id(cid);
+        if (ctx != NULL) {
+            ctx->flags_id &= ~GNRC_SIXLOWPAN_CTX_FLAGS_COMP;
+            ctx->ltime = 0;
+            del_timer[cid].callback = _del_cb;
+            del_timer[cid].arg = ctx;
+            xtimer_set(&del_timer[cid], GNRC_SIXLOWPAN_ND_RTR_MIN_CTX_DELAY * SEC_IN_USEC);
+        }
+    }
+    else {
+        printf("Context %u already marked for removal\n", cid);
+        return 1;
+    }
+    /* advertise updated context */
+    _adv_ctx();
+    return 0;
+}
+
+int _gnrc_6ctx(int argc, char **argv)
+{
+    if (argc < 2) {
+        _gnrc_6ctx_list();
+    }
+    else if (strcmp("add", argv[1]) == 0) {
+        if (argc < 5) {
+            _usage(argv[0]);
+            return 1;
+        }
+        return _gnrc_6ctx_add(argv[0], argv[2], argv[3], argv[4]);
+    }
+    else if (strcmp("del", argv[1]) == 0) {
+        return _gnrc_6ctx_del(argv[0], argv[2]);
+    }
+    else {
+        _usage(argv[0]);
+        return 1;
+    }
+    return 0;
+}
+
+/** @} */

sys/shell/commands/shell_commands.c

@@ -120,6 +120,12 @@ extern int _zep_init(int argc, char **argv);
 extern int _gnrc_rpl(int argc, char **argv);
 #endif
 
+#ifdef MODULE_GNRC_SIXLOWPAN_CTX
+#ifdef MODULE_GNRC_SIXLOWPAN_ND_BORDER_ROUTER
+extern int _gnrc_6ctx(int argc, char **argv);
+#endif
+#endif
+
 const shell_command_t _shell_command_list[] = {
     {"reboot", "Reboot the node", _reboot_handler},
 #ifdef MODULE_CONFIG
@@ -197,6 +203,11 @@ const shell_command_t _shell_command_list[] = {
 #endif
 #ifdef MODULE_GNRC_RPL
     {"rpl", "rpl configuration tool [help|init|rm|root|show]", _gnrc_rpl },
+#endif
+#ifdef MODULE_GNRC_SIXLOWPAN_CTX
+#ifdef MODULE_GNRC_SIXLOWPAN_ND_BORDER_ROUTER
+    {"6ctx", "6LoWPAN context configuration tool", _gnrc_6ctx },
+#endif
 #endif
     {NULL, NULL, NULL}
 };