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gluon-radvd: on-link flag 

By introducing a new option -a in addition to -p this patch allows
controlling the on-link flag of announcements.

A prefix specified using -a will have the on-link flag set to zero
while a prefix specified using -p will retain its behaviour (i.e.
on-link flag set).

Example:

    gluon-radvd -i local-node -p 2001:db8:aaaa:/64 -a 2001:db8:bbbb::/64

This will announce 2001:db8:aaaa::/64 with the on-link flag set and
2001:db8:bbbb::/64 with the flag unset.
This commit is contained in:
Nils Schneider 2015-05-08 13:01:22 +02:00
parent b4107909c4
commit ec7fe2cca9
1 changed files with 17 additions and 5 deletions
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22
src/gluon-radvd.c
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@ -100,6 +100,7 @@ static struct global {
size_t n_prefixes;
struct in6_addr prefixes[MAX_PREFIXES];
bool prefixes_onlink[MAX_PREFIXES];
} G = {
.rtnl_sock = -1,
.icmp_sock = -1,
@ -483,11 +484,16 @@ static void send_advert(void) {
size_t i;
for (i = 0; i < G.n_prefixes; i++) {
uint8_t flags = ND_OPT_PI_FLAG_AUTO;
if (G.prefixes_onlink[i])
flags |= ND_OPT_PI_FLAG_ONLINK;
prefixes[i] = (struct nd_opt_prefix_info){
.nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION,
.nd_opt_pi_len = 4,
.nd_opt_pi_prefix_len = 64,
.nd_opt_pi_flags_reserved = ND_OPT_PI_FLAG_AUTO|ND_OPT_PI_FLAG_ONLINK,
.nd_opt_pi_flags_reserved = flags,
.nd_opt_pi_valid_time = htonl(AdvValidLifetime),
.nd_opt_pi_preferred_time = htonl(AdvPreferredLifetime),
.nd_opt_pi_prefix = G.prefixes[i],
@ -541,10 +547,10 @@ static void send_advert(void) {
static void usage(void) {
fprintf(stderr, "Usage: gluon-radvd [-h] -i <interface> -p <prefix> [ -p <prefix> ... ]\n");
fprintf(stderr, "Usage: gluon-radvd [-h] -i <interface> -a/-p <prefix> [ -a/-p <prefix> ... ]\n");
}
static void add_prefix(const char *prefix) {
static void add_prefix(const char *prefix, bool adv_onlink) {
if (G.n_prefixes == MAX_PREFIXES)
error(1, 0, "maximum number of prefixes is %i.", MAX_PREFIXES);
@ -566,6 +572,8 @@ static void add_prefix(const char *prefix) {
if (memcmp(G.prefixes[G.n_prefixes].s6_addr + 8, zero, 8) != 0)
goto error;
G.prefixes_onlink[G.n_prefixes] = adv_onlink;
G.n_prefixes++;
return;
@ -575,7 +583,7 @@ static void add_prefix(const char *prefix) {
static void parse_cmdline(int argc, char *argv[]) {
int c;
while ((c = getopt(argc, argv, "i:p:h")) != -1) {
while ((c = getopt(argc, argv, "i:a:p:h")) != -1) {
switch(c) {
case 'i':
if (G.ifname)
@ -585,8 +593,12 @@ static void parse_cmdline(int argc, char *argv[]) {
break;
case 'a':
add_prefix(optarg, false);
break;
case 'p':
add_prefix(optarg);
add_prefix(optarg, true);
break;
case 'h':