Adding upstream version 4.99.4.upstream/4.99.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 264 insertions, 0 deletions

diff --git a/print-nsh.c b/print-nsh.c
new file mode 100644
index 0000000..12a63cd
--- /dev/null
+++ b/print-nsh.c
@@ -0,0 +1,264 @@
+/* Copyright (c) 2015, bugyo
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* \summary: Network Service Header (NSH) printer */
+
+/* specification: RFC 8300 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+
+static const struct tok nsh_flags [] = {
+    { 0x2, "O" },
+    { 0, NULL }
+};
+
+/*
+ *    0                   1                   2                   3
+ *    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *   |Ver|O|U|    TTL    |   Length  |U|U|U|U|MD Type| Next Protocol |
+ *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+#define NSH_BASE_HDR_LEN 4
+#define NSH_VER(x)       (((x) & 0xc0000000) >> 30)
+#define NSH_FLAGS(x)     (((x) & 0x30000000) >> 28)
+#define NSH_TTL(x)       (((x) & 0x0fc00000) >> 22)
+#define NSH_LENGTH(x)    (((x) & 0x003f0000) >> 16)
+#define NSH_MD_TYPE(x)   (((x) & 0x00000f00) >>  8)
+#define NSH_NEXT_PROT(x) (((x) & 0x000000ff) >>  0)
+
+#define NSH_SERVICE_PATH_HDR_LEN 4
+#define NSH_HDR_WORD_SIZE 4U
+
+#define MD_RSV   0x00
+#define MD_TYPE1 0x01
+#define MD_TYPE2 0x02
+#define MD_EXP   0x0F
+static const struct tok md_str[] = {
+    { MD_RSV,   "reserved"     },
+    { MD_TYPE1, "1"            },
+    { MD_TYPE2, "2"            },
+    { MD_EXP,   "experimental" },
+    { 0, NULL }
+};
+
+#define NP_IPV4 0x01
+#define NP_IPV6 0x02
+#define NP_ETH  0x03
+#define NP_NSH  0x04
+#define NP_MPLS 0x05
+#define NP_EXP1 0xFE
+#define NP_EXP2 0xFF
+static const struct tok np_str[] = {
+    { NP_IPV4, "IPv4"         },
+    { NP_IPV6, "IPv6"         },
+    { NP_ETH,  "Ethernet"     },
+    { NP_NSH,  "NSH"          },
+    { NP_MPLS, "MPLS"         },
+    { NP_EXP1, "Experiment 1" },
+    { NP_EXP2, "Experiment 2" },
+    { 0, NULL }
+};
+
+void
+nsh_print(netdissect_options *ndo, const u_char *bp, u_int len)
+{
+    uint32_t basehdr;
+    u_int ver, length, md_type;
+    uint8_t next_protocol;
+    u_char past_headers = 0;
+    u_int next_len;
+
+    ndo->ndo_protocol = "nsh";
+    /*
+     *    0                   1                   2                   3
+     *    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+     *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     *   |                Base Header                                    |
+     *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     *   |                Service Path Header                            |
+     *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     *   |                                                               |
+     *   ~                Context Header(s)                              ~
+     *   |                                                               |
+     *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     */
+
+    /* print Base Header and Service Path Header */
+    if (len < NSH_BASE_HDR_LEN + NSH_SERVICE_PATH_HDR_LEN) {
+        ND_PRINT(" (packet length %u < %u)",
+                 len, NSH_BASE_HDR_LEN + NSH_SERVICE_PATH_HDR_LEN);
+        goto invalid;
+    }
+
+    basehdr = GET_BE_U_4(bp);
+    bp += 4;
+    ver = NSH_VER(basehdr);
+    length = NSH_LENGTH(basehdr);
+    md_type = NSH_MD_TYPE(basehdr);
+    next_protocol = NSH_NEXT_PROT(basehdr);
+
+    ND_PRINT("NSH, ");
+    if (ndo->ndo_vflag > 1) {
+        ND_PRINT("ver %u, ", ver);
+    }
+    if (ver != 0)
+        return;
+    ND_PRINT("flags [%s], ",
+             bittok2str_nosep(nsh_flags, "none", NSH_FLAGS(basehdr)));
+    if (ndo->ndo_vflag > 2) {
+        ND_PRINT("TTL %u, ", NSH_TTL(basehdr));
+        ND_PRINT("length %u, ", length);
+        ND_PRINT("md type %s, ", tok2str(md_str, "unknown (0x%02x)", md_type));
+    }
+    if (ndo->ndo_vflag > 1) {
+        ND_PRINT("next-protocol %s, ",
+                 tok2str(np_str, "unknown (0x%02x)", next_protocol));
+    }
+
+    /* Make sure we have all the headers */
+    if (len < length * NSH_HDR_WORD_SIZE) {
+        ND_PRINT(" (too many headers for packet length %u)", len);
+        goto invalid;
+    }
+
+    /*
+     *    0                   1                   2                   3
+     *    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+     *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     *   |          Service Path Identifier (SPI)        | Service Index |
+     *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     *
+     */
+    ND_PRINT("service-path-id 0x%06x, ", GET_BE_U_3(bp));
+    bp += 3;
+    ND_PRINT("service-index 0x%x", GET_U_1(bp));
+    bp += 1;
+
+    /*
+     * length includes the lengths of the Base and Service Path headers.
+     * That means it must be at least 2.
+     */
+    if (length < 2) {
+        ND_PRINT(" (less than two headers)");
+        goto invalid;
+    }
+
+    /*
+     * Print, or skip, the Context Headers.
+     * (length - 2) is the length of those headers.
+     */
+    if (ndo->ndo_vflag > 2) {
+        u_int n;
+
+        if (md_type == MD_TYPE1) {
+            if (length != 6) {
+                ND_PRINT(" (invalid length for the MD type)");
+                goto invalid;
+            }
+            for (n = 0; n < length - 2; n++) {
+                ND_PRINT("\n        Context[%02u]: 0x%08x", n, GET_BE_U_4(bp));
+                bp += NSH_HDR_WORD_SIZE;
+            }
+            past_headers = 1;
+        }
+        else if (md_type == MD_TYPE2) {
+            n = 0;
+            while (n < length - 2) {
+                uint16_t tlv_class;
+                uint8_t tlv_type, tlv_len, tlv_len_padded;
+
+                tlv_class = GET_BE_U_2(bp);
+                bp += 2;
+                tlv_type  = GET_U_1(bp);
+                bp += 1;
+                tlv_len   = GET_U_1(bp) & 0x7f;
+                bp += 1;
+                tlv_len_padded = roundup2(tlv_len, NSH_HDR_WORD_SIZE);
+
+                ND_PRINT("\n        TLV Class %u, Type %u, Len %u",
+                          tlv_class, tlv_type, tlv_len);
+
+                n += 1;
+
+                if (length - 2 < n + tlv_len_padded / NSH_HDR_WORD_SIZE) {
+                    ND_PRINT(" (length too big)");
+                    goto invalid;
+                }
+
+                if (tlv_len) {
+                    const char *sep = "0x";
+                    u_int vn;
+
+                    ND_PRINT("\n            Value: ");
+                    for (vn = 0; vn < tlv_len; vn++) {
+                        ND_PRINT("%s%02x", sep, GET_U_1(bp));
+                        bp += 1;
+                        sep = ":";
+                    }
+                    /* Cover any TLV padding. */
+                    ND_TCHECK_LEN(bp, tlv_len_padded - tlv_len);
+                    bp += tlv_len_padded - tlv_len;
+                    n += tlv_len_padded / NSH_HDR_WORD_SIZE;
+                }
+            }
+            past_headers = 1;
+        }
+    }
+    if (! past_headers) {
+        ND_TCHECK_LEN(bp, (length - 2) * NSH_HDR_WORD_SIZE);
+        bp += (length - 2) * NSH_HDR_WORD_SIZE;
+    }
+    ND_PRINT(ndo->ndo_vflag ? "\n    " : ": ");
+
+    /* print Next Protocol */
+    next_len = len - length * NSH_HDR_WORD_SIZE;
+    switch (next_protocol) {
+    case NP_IPV4:
+        ip_print(ndo, bp, next_len);
+        break;
+    case NP_IPV6:
+        ip6_print(ndo, bp, next_len);
+        break;
+    case NP_ETH:
+        ether_print(ndo, bp, next_len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
+        break;
+    default:
+        ND_PRINT("ERROR: unknown-next-protocol");
+        return;
+    }
+
+    return;
+
+invalid:
+    nd_print_invalid(ndo);
+}
+