*: Initial Import of Babeld into FRR

This is a direct copy of:
https://github.com/boutier/quagga-merge

From the branch babel-merge

I copied the babeld directory into FRR and then fixed up everything to
compile.

Babeld at this point in time when run will more than likely crash and burn
in it's interfactions with zebra.

I might have messed up the cli, which will need to be looked at

extract.pl.in and vtysh.c need to be fixed up.  Additionally we probably
need to work on DEFUN_NOSH conversion in babeld as well

This code comes from:
Matthieu Boutier <boutier@irif.fr>
Juliusz Chroboczek <jch@irif.fr>

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 240 insertions, 0 deletions

diff --git a/babeld/xroute.c b/babeld/xroute.c
new file mode 100644
index 0000000000..342b5c4871
--- /dev/null
+++ b/babeld/xroute.c
@@ -0,0 +1,240 @@
+/*
+Copyright (c) 2007, 2008 by Juliusz Chroboczek
+Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include <zebra.h>
+#include "if.h"
+#include "log.h"
+
+#include "babeld.h"
+#include "kernel.h"
+#include "neighbour.h"
+#include "message.h"
+#include "route.h"
+#include "xroute.h"
+#include "util.h"
+#include "babel_interface.h"
+
+static int xroute_add_new_route(unsigned char prefix[16], unsigned char plen,
+                                unsigned short metric, unsigned int ifindex,
+                                int proto, int send_updates);
+
+static struct xroute *xroutes;
+static int numxroutes = 0, maxxroutes = 0;
+
+/* Add redistributed route to Babel table. */
+int
+babel_ipv4_route_add (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix,
+                      unsigned int ifindex, struct in_addr *nexthop)
+{
+    unsigned char uchar_prefix[16];
+
+    inaddr_to_uchar(uchar_prefix, &prefix->prefix);
+    debugf(BABEL_DEBUG_ROUTE, "Adding new ipv4 route coming from Zebra.");
+    xroute_add_new_route(uchar_prefix, prefix->prefixlen + 96,
+                         api->metric, ifindex, 0, 1);
+    return 0;
+}
+
+/* Remove redistributed route from Babel table. */
+int
+babel_ipv4_route_delete (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix,
+                         unsigned int ifindex)
+{
+    unsigned char uchar_prefix[16];
+    struct xroute *xroute = NULL;
+
+    inaddr_to_uchar(uchar_prefix, &prefix->prefix);
+    xroute = find_xroute(uchar_prefix, prefix->prefixlen + 96);
+    if (xroute != NULL) {
+        debugf(BABEL_DEBUG_ROUTE, "Removing ipv4 route (from zebra).");
+        flush_xroute(xroute);
+    }
+    return 0;
+}
+
+/* Add redistributed route to Babel table. */
+int
+babel_ipv6_route_add (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix,
+                      unsigned int ifindex, struct in6_addr *nexthop)
+{
+    unsigned char uchar_prefix[16];
+
+    in6addr_to_uchar(uchar_prefix, &prefix->prefix);
+    debugf(BABEL_DEBUG_ROUTE, "Adding new route coming from Zebra.");
+    xroute_add_new_route(uchar_prefix, prefix->prefixlen, api->metric, ifindex,
+                         0, 1);
+    return 0;
+}
+
+/* Remove redistributed route from Babel table. */
+int
+babel_ipv6_route_delete (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix,
+                         unsigned int ifindex)
+{
+    unsigned char uchar_prefix[16];
+    struct xroute *xroute = NULL;
+
+    in6addr_to_uchar(uchar_prefix, &prefix->prefix);
+    xroute = find_xroute(uchar_prefix, prefix->prefixlen);
+    if (xroute != NULL) {
+        debugf(BABEL_DEBUG_ROUTE, "Removing route (from zebra).");
+        flush_xroute(xroute);
+    }
+    return 0;
+}
+
+struct xroute *
+find_xroute(const unsigned char *prefix, unsigned char plen)
+{
+    int i;
+    for(i = 0; i < numxroutes; i++) {
+        if(xroutes[i].plen == plen &&
+           memcmp(xroutes[i].prefix, prefix, 16) == 0)
+            return &xroutes[i];
+    }
+    return NULL;
+}
+
+void
+flush_xroute(struct xroute *xroute)
+{
+    int i;
+
+    i = xroute - xroutes;
+    assert(i >= 0 && i < numxroutes);
+
+    if(i != numxroutes - 1)
+        memcpy(xroutes + i, xroutes + numxroutes - 1, sizeof(struct xroute));
+    numxroutes--;
+    VALGRIND_MAKE_MEM_UNDEFINED(xroutes + numxroutes, sizeof(struct xroute));
+
+    if(numxroutes == 0) {
+        free(xroutes);
+        xroutes = NULL;
+        maxxroutes = 0;
+    } else if(maxxroutes > 8 && numxroutes < maxxroutes / 4) {
+        struct xroute *new_xroutes;
+        int n = maxxroutes / 2;
+        new_xroutes = realloc(xroutes, n * sizeof(struct xroute));
+        if(new_xroutes == NULL)
+            return;
+        xroutes = new_xroutes;
+        maxxroutes = n;
+    }
+}
+
+static int
+add_xroute(unsigned char prefix[16], unsigned char plen,
+           unsigned short metric, unsigned int ifindex, int proto)
+{
+    struct xroute *xroute = find_xroute(prefix, plen);
+    if(xroute) {
+        if(xroute->metric <= metric)
+            return 0;
+        xroute->metric = metric;
+        return 1;
+    }
+
+    if(numxroutes >= maxxroutes) {
+        struct xroute *new_xroutes;
+        int n = maxxroutes < 1 ? 8 : 2 * maxxroutes;
+        new_xroutes = xroutes == NULL ?
+            malloc(n * sizeof(struct xroute)) :
+            realloc(xroutes, n * sizeof(struct xroute));
+        if(new_xroutes == NULL)
+            return -1;
+        maxxroutes = n;
+        xroutes = new_xroutes;
+    }
+
+    memcpy(xroutes[numxroutes].prefix, prefix, 16);
+    xroutes[numxroutes].plen = plen;
+    xroutes[numxroutes].metric = metric;
+    xroutes[numxroutes].ifindex = ifindex;
+    xroutes[numxroutes].proto = proto;
+    numxroutes++;
+    return 1;
+}
+
+/* Returns an overestimate of the number of xroutes. */
+int
+xroutes_estimate()
+{
+    return numxroutes;
+}
+
+struct xroute_stream {
+    int index;
+};
+
+struct
+xroute_stream *
+xroute_stream()
+{
+    struct xroute_stream *stream = malloc(sizeof(struct xroute_stream));
+    if(stream == NULL)
+       return NULL;
+
+    stream->index = 0;
+    return stream;
+}
+
+struct xroute *
+xroute_stream_next(struct xroute_stream *stream)
+{
+    if(stream->index < numxroutes)
+        return &xroutes[stream->index++];
+    else
+        return NULL;
+}
+
+void
+xroute_stream_done(struct xroute_stream *stream)
+{
+    free(stream);
+}
+
+/* add an xroute, verifying some conditions; return 0 if there is no changes */
+static int
+xroute_add_new_route(unsigned char prefix[16], unsigned char plen,
+                     unsigned short metric, unsigned int ifindex,
+                     int proto, int send_updates)
+{
+    int rc;
+    if(martian_prefix(prefix, plen))
+        return 0;
+    metric = redistribute_filter(prefix, plen, ifindex, proto);
+    if(metric < INFINITY) {
+        rc = add_xroute(prefix, plen, metric, ifindex, proto);
+        if(rc > 0) {
+            struct babel_route *route;
+            route = find_installed_route(prefix, plen);
+            if(route)
+                uninstall_route(route);
+            if(send_updates)
+                send_update(NULL, 0, prefix, plen);
+            return 1;
+        }
+    }
+    return 0;
+}