Add babeld sources.

component/babeld/LICENCE

+Copyright (c) 2007, 2008 by 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.

component/babeld/Makefile

+PREFIX = /usr/local
+
+CDEBUGFLAGS = -Os -g -Wall
+
+DEFINES = $(PLATFORM_DEFINES)
+
+CFLAGS = $(CDEBUGFLAGS) $(DEFINES) $(EXTRA_DEFINES)
+
+LDLIBS = -lrt
+
+SRCS = babeld.c net.c kernel.c util.c interface.c source.c neighbour.c \
+       route.c xroute.c message.c resend.c configuration.c local.c
+
+OBJS = babeld.o net.o kernel.o util.o interface.o source.o neighbour.o \
+       route.o xroute.o message.o resend.o configuration.o local.o
+
+babeld: $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o babeld $(OBJS) $(LDLIBS)
+
+.SUFFIXES: .man .html
+
+.man.html:
+	rman -f html $< | \
+	sed -e "s|<a href='babeld.8'|<a href=\"babeld.html\"|" \
+            -e "s|<a href='\\(ahcp[-a-z]*\\).8'|<a href=\"../ahcp/\1.html\"|" \
+	    -e "s|<a href='[^']*8'>\\(.*(8)\\)</a>|\1|" \
+	> $@
+
+babeld.html: babeld.man
+
+.PHONY: all install install.minimal uninstall clean
+
+all: babeld babeld.man
+
+install.minimal: babeld
+	-rm -f $(TARGET)$(PREFIX)/bin/babeld
+	mkdir -p $(TARGET)$(PREFIX)/bin
+	cp -f babeld $(TARGET)$(PREFIX)/bin
+
+install: install.minimal all
+	mkdir -p $(TARGET)$(PREFIX)/man/man8
+	cp -f babeld.man $(TARGET)$(PREFIX)/man/man8/babeld.8
+
+uninstall:
+	-rm -f $(TARGET)$(PREFIX)/bin/babeld
+	-rm -f $(TARGET)$(PREFIX)/man/man8/babeld.8
+
+clean:
+	-rm -f babeld babeld.html *.o *~ core TAGS gmon.out
+
+kernel.o: kernel_netlink.c kernel_socket.c

component/babeld/README

+Babel
+=====
+
+Babel is a loop-avoiding distance-vector routing protocol roughly
+based on HSDV and AODV, but with provisions for link cost estimation
+and redistribution of routes from other routing protocols.
+
+
+Installation
+============
+
+    $ make
+    $ su -c 'make install'
+
+If compiling for OpenWRT, you will probably want to say something like
+
+    $ make CC=mipsel-linux-gcc PLATFORM_DEFINES='-march=mips32'
+
+On Mac OS X, you'll need to do
+
+    $ make LDLIBS=''
+
+
+Setting up a network for use with Babel
+=======================================
+
+1. Set up every node's interface
+--------------------------------
+
+On every node, set up the wireless interface:
+
+    # iwconfig eth1 mode ad-hoc channel 11 essid "my-mesh-network"
+    # ip link set up dev eth1
+
+2. Set up every node's IP addresses
+-----------------------------------
+
+You will need to make sure that all of your nodes have a unique IPv6
+address, and/or a unique IPv4 address.
+
+On every node, run something like:
+
+    # ip addr add 192.168.13.33/32 dev eth1
+    # ip -6 addr add $(generate-ipv6-address -r)/128 dev eth1
+
+You will find the generate-ipv6-address utility, which can generate random
+IPv6 addresses according to RFC 4193, on
+
+      http://www.pps.jussieu.fr/~jch/software/files/
+
+
+A note about tunnels and VPNs
+-----------------------------
+
+Some VPN implementations (notably OpenVPN and Linux GRE) do not
+automatically add an IPv6 link-local address to the tunnel interface.
+If you attempt to run Babel over such an interface, it will complain
+that it ``couldn't allocate requested address''.
+
+The solution is to manually add the link-local address to the
+interface.  This can be done by running e.g.
+
+    # ip -6 addr add $(ahcp-generate-address fe80::) dev gre0
+
+
+3. Start the routing daemon
+---------------------------
+
+Run Babel on every node, specifying the set of interfaces that it
+should consider:
+
+    # babeld eth1
+
+If your node has multiple interfaces which you want to participate in
+the Babel network, just list them all:
+
+    # babeld eth0 eth1 sit1
+
+
+4. Setting up an Internet gateway
+---------------------------------
+
+If you have one or more Internet gateways on your mesh network, you
+will want to set them up so that they redistribute the default route.
+Babel will only redistribute routes with an explicit protocol
+attached, so you must say something like:
+
+    # ip route add 0.0.0.0/0 via 1.2.3.4 dev eth0 proto static
+
+In order to redistribute all routes, you will say:
+
+    # babeld -C 'redistribute metric 128' eth1
+
+You may also be more selective in the routes you redistribute, for
+instance by specifying the interface over which the route goes out:
+
+    # babeld -C 'redistribute if eth0 metric 128' eth1
+
+or by constraining the prefix length:
+
+    # babeld -C 'redistribute ip ::/0 le 64 metric 128' \
+             -C 'redistribute ip 0.0.0.0/0 le 28 metric 128' \
+             eth1
+
+You may also want to constrain which local routes (routes to local
+interface addresses) you advertise:
+
+    # babeld -C 'redistribute local if eth1' -C 'redistribute local deny' \
+             -C 'redistribute metric 128' \
+             eth1
+
+If you find all of this too complicated and error-prone (as I do), you
+may want to consider autoconfiguring your routing domain using AHCP:
+
+    http://www.pps.jussieu.fr/~jch/software/ahcp/
+
+-- Juliusz Chroboczek

component/babeld/babeld.h

+/*
+Copyright (c) 2007, 2008 by 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.
+*/
+
+#define INFINITY ((unsigned short)(~0))
+
+#ifndef RTPROT_BABEL
+#define RTPROT_BABEL 42
+#endif
+
+#define RTPROT_BABEL_LOCAL -2
+
+#undef MAX
+#undef MIN
+
+#define MAX(x,y) ((x)<=(y)?(y):(x))
+#define MIN(x,y) ((x)<=(y)?(x):(y))
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+/* nothing */
+#elif defined(__GNUC__)
+#define inline __inline
+#if  (__GNUC__ >= 3)
+#define restrict __restrict
+#else
+#define restrict /**/
+#endif
+#else
+#define inline /**/
+#define restrict /**/
+#endif
+
+#if defined(__GNUC__) && (__GNUC__ >= 3)
+#define ATTRIBUTE(x) __attribute__ (x)
+#define LIKELY(_x) __builtin_expect(!!(_x), 1)
+#define UNLIKELY(_x) __builtin_expect(!!(_x), 0)
+#else
+#define ATTRIBUTE(x) /**/
+#define LIKELY(_x) !!(_x)
+#define UNLIKELY(_x) !!(_x)
+#endif
+
+#if defined(__GNUC__) && (__GNUC__ >= 4) && (__GNUC_MINOR__ >= 3)
+#define COLD __attribute__ ((cold))
+#else
+#define COLD /**/
+#endif
+
+#ifndef IF_NAMESIZE
+#include <sys/socket.h>
+#include <net/if.h>
+#endif
+
+#ifdef HAVE_VALGRIND
+#include <valgrind/memcheck.h>
+#else
+#ifndef VALGRIND_MAKE_MEM_UNDEFINED
+#define VALGRIND_MAKE_MEM_UNDEFINED(a, b) do {} while(0)
+#endif
+#ifndef VALGRIND_CHECK_MEM_IS_DEFINED
+#define VALGRIND_CHECK_MEM_IS_DEFINED(a, b) do {} while(0)
+#endif
+#endif
+
+extern struct timeval now;
+extern int debug;
+extern time_t reboot_time;
+extern int default_wireless_hello_interval, default_wired_hello_interval;
+extern int resend_delay;
+extern int link_detect;
+extern int all_wireless;
+extern int local_socket;
+
+extern unsigned char myid[8];
+
+extern const unsigned char zeroes[16], ones[16];
+
+extern int protocol_port;
+extern unsigned char protocol_group[16];
+extern int protocol_socket;
+extern int kernel_socket;
+extern int max_request_hopcount;
+
+void schedule_neighbours_check(int msecs, int override);
+int resize_receive_buffer(int size);

component/babeld/configuration.h

+/*
+Copyright (c) 2007, 2008 by 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.
+*/
+
+struct filter {
+    int af;
+    char *ifname;
+    unsigned int ifindex;
+    unsigned char *id;
+    unsigned char *prefix;
+    unsigned char plen;
+    unsigned char plen_ge, plen_le;
+    unsigned char *neigh;
+    int proto;                  /* May be negative */
+    unsigned int result;
+    struct filter *next;
+};
+
+int parse_config_from_file(char *filename);
+int parse_config_from_string(char *string);
+void renumber_filters(void);
+
+int input_filter(const unsigned char *id,
+                 const unsigned char *prefix, unsigned short plen,
+                 const unsigned char *neigh, unsigned int ifindex);
+int output_filter(const unsigned char *id, const unsigned char *prefix,
+                  unsigned short plen, unsigned int ifindex);
+int redistribute_filter(const unsigned char *prefix, unsigned short plen,
+                        unsigned int ifindex, int proto);
+int finalise_config(void);

component/babeld/interface.h

+/*
+Copyright (c) 2007, 2008 by 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.
+*/
+
+struct buffered_update {
+    unsigned char id[8];
+    unsigned char prefix[16];
+    unsigned char plen;
+    unsigned char pad[3];
+};
+
+struct interface_conf {
+    char *ifname;
+    unsigned hello_interval;
+    unsigned update_interval;
+    unsigned short cost;
+    char wired;
+    char split_horizon;
+    char lq;
+    char faraway;
+    int channel;
+    struct interface_conf *next;
+};
+
+#define CONFIG_DEFAULT 0
+#define CONFIG_NO 1
+#define CONFIG_YES 2
+
+#define IF_UP (1 << 0)
+#define IF_WIRED (1<<1)
+#define IF_SPLIT_HORIZON (1 << 2)
+#define IF_LQ (1 << 3)
+#define IF_FARAWAY (1 << 4)
+
+/* Only INTERFERING can appear on the wire. */
+#define IF_CHANNEL_UNKNOWN 0
+#define IF_CHANNEL_INTERFERING 255
+#define IF_CHANNEL_NONINTERFERING -2
+
+struct interface {
+    struct interface *next;
+    struct interface_conf *conf;
+    unsigned int ifindex;
+    unsigned short flags;
+    unsigned short cost;
+    int channel;
+    struct timeval hello_timeout;
+    struct timeval update_timeout;
+    struct timeval flush_timeout;
+    struct timeval update_flush_timeout;
+    char name[IF_NAMESIZE];
+    unsigned char *ipv4;
+    int numll;
+    unsigned char (*ll)[16];
+    int buffered;
+    int bufsize;
+    char have_buffered_hello;
+    char have_buffered_id;
+    char have_buffered_nh;
+    char have_buffered_prefix;
+    unsigned char buffered_id[16];
+    unsigned char buffered_nh[4];
+    unsigned char buffered_prefix[16];
+    unsigned char *sendbuf;
+    struct buffered_update *buffered_updates;
+    int num_buffered_updates;
+    int update_bufsize;
+    time_t bucket_time;
+    unsigned int bucket;
+    time_t last_update_time;
+    unsigned short hello_seqno;
+    unsigned hello_interval;
+    unsigned update_interval;
+};
+
+#define IF_CONF(_ifp, _field) \
+    ((_ifp)->conf ? (_ifp)->conf->_field : 0)
+
+extern struct interface *interfaces;
+
+#define FOR_ALL_INTERFACES(_ifp) for(_ifp = interfaces; _ifp; _ifp = _ifp->next)
+
+static inline int
+if_up(struct interface *ifp)
+{
+    return !!(ifp->flags & IF_UP);
+}
+
+struct interface *add_interface(char *ifname, struct interface_conf *if_conf);
+unsigned jitter(struct interface *ifp, int urgent);
+unsigned update_jitter(struct interface *ifp, int urgent);
+void set_timeout(struct timeval *timeout, int msecs);
+int interface_up(struct interface *ifp, int up);
+int interface_ll_address(struct interface *ifp, const unsigned char *address);
+void check_interfaces(void);

component/babeld/kernel.c

+/*
+Copyright 2007, 2008 by Grégoire Henry, Julien Cristau 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 <sys/time.h>
+#include <sys/param.h>
+#include <time.h>
+
+#include "babeld.h"
+
+#ifdef __linux
+#include "kernel_netlink.c"
+#else
+#include "kernel_socket.c"
+#endif
+
+/* Like gettimeofday, but returns monotonic time.  If POSIX clocks are not
+   available, falls back to gettimeofday but enforces monotonicity. */
+int
+gettime(struct timeval *tv)
+{
+    int rc;
+    static time_t offset = 0, previous = 0;
+
+#if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && defined(CLOCK_MONOTONIC)
+    static int have_posix_clocks = -1;
+
+    if(UNLIKELY(have_posix_clocks < 0)) {
+        struct timespec ts;
+        rc = clock_gettime(CLOCK_MONOTONIC, &ts);
+        if(rc < 0) {
+            have_posix_clocks = 0;
+        } else {
+            have_posix_clocks = 1;
+        }
+    }
+
+    if(have_posix_clocks) {
+        struct timespec ts;
+        int rc;
+        rc = clock_gettime(CLOCK_MONOTONIC, &ts);
+        if(rc < 0)
+            return rc;
+        tv->tv_sec = ts.tv_sec;
+        tv->tv_usec = ts.tv_nsec / 1000;
+        return rc;
+    }
+#endif
+
+    rc = gettimeofday(tv, NULL);
+    if(rc < 0)
+        return rc;
+    tv->tv_sec += offset;
+    if(UNLIKELY(previous > tv->tv_sec)) {
+        offset += previous - tv->tv_sec;
+        tv->tv_sec = previous;
+    }
+    previous = tv->tv_sec;
+    return rc;
+}
+
+/* If /dev/urandom doesn't exist, this will fail with ENOENT, which the
+   caller will deal with gracefully. */
+
+int
+read_random_bytes(void *buf, size_t len)
+{
+    int fd;
+    int rc;
+
+    fd = open("/dev/urandom", O_RDONLY);
+    if(fd < 0) {
+	rc = -1;
+    } else {
+        rc = read(fd, buf, len);
+        if(rc < 0 || (unsigned)rc < len)
+            rc = -1;
+        close(fd);
+    }
+    return rc;
+}
+

component/babeld/kernel.h

+/*
+Copyright (c) 2007, 2008 by 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 <netinet/in.h>
+#include "babeld.h"
+
+#define KERNEL_INFINITY 0xFFFF
+
+struct kernel_route {
+    unsigned char prefix[16];
+    int plen;
+    int metric;
+    unsigned int ifindex;
+    int proto;
+    unsigned char gw[16];
+};
+
+#define ROUTE_FLUSH 0
+#define ROUTE_ADD 1
+#define ROUTE_MODIFY 2
+
+#define CHANGE_LINK  (1 << 0)
+#define CHANGE_ROUTE (1 << 1)
+#define CHANGE_ADDR  (1 << 2)
+
+extern int export_table, import_table;
+
+int kernel_setup(int setup);
+int kernel_setup_socket(int setup);
+int kernel_setup_interface(int setup, const char *ifname, int ifindex);
+int kernel_interface_operational(const char *ifname, int ifindex);
+int kernel_interface_ipv4(const char *ifname, int ifindex,
+                          unsigned char *addr_r);
+int kernel_interface_mtu(const char *ifname, int ifindex);
+int kernel_interface_wireless(const char *ifname, int ifindex);
+int kernel_interface_channel(const char *ifname, int ifindex);
+int kernel_route(int operation, const unsigned char *dest, unsigned short plen,
+                 const unsigned char *gate, int ifindex, unsigned int metric,
+                 const unsigned char *newgate, int newifindex,
+                 unsigned int newmetric);
+int kernel_routes(struct kernel_route *routes, int maxroutes);
+int kernel_callback(int (*fn)(int, void*), void *closure);
+int kernel_addresses(char *ifname, int ifindex, int ll,
+                     struct kernel_route *routes, int maxroutes);
+int if_eui64(char *ifname, int ifindex, unsigned char *eui);
+int gettime(struct timeval *tv);
+int read_random_bytes(void *buf, size_t len);