#define ICMP6_ND_RECV_SIZE (IP6_MIN_MTU - sizeof(struct ip6_hdr))
#define ICMP6_OPT_LEN_UNITS 8
+typedef struct ICMP6Prefix ICMP6Prefix;
+
+struct ICMP6Prefix {
+ RefCount n_ref;
+
+ LIST_FIELDS(ICMP6Prefix, prefixes);
+
+ uint8_t len;
+ sd_event_source *timeout_valid;
+ struct in6_addr addr;
+};
+
struct sd_icmp6_nd {
RefCount n_ref;
int event_priority;
int index;
struct ether_addr mac_addr;
+ uint32_t mtu;
+ LIST_HEAD(ICMP6Prefix, prefixes);
int fd;
sd_event_source *recv;
sd_event_source *timeout;
#define log_icmp6_nd(p, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "ICMPv6 CLIENT: " fmt, ##__VA_ARGS__)
+static ICMP6Prefix *icmp6_prefix_unref(ICMP6Prefix *prefix) {
+ if (prefix && REFCNT_DEC(prefix->n_ref) <= 0) {
+ prefix->timeout_valid =
+ sd_event_source_unref(prefix->timeout_valid);
+
+ free(prefix);
+ }
+
+ return NULL;
+}
+
+static int icmp6_prefix_new(ICMP6Prefix **ret) {
+ _cleanup_free_ ICMP6Prefix *prefix = NULL;
+
+ assert(ret);
+
+ prefix = new0(ICMP6Prefix, 1);
+ if (!prefix)
+ return -ENOMEM;
+
+ prefix->n_ref = REFCNT_INIT;
+ LIST_INIT(prefixes, prefix);
+
+ *ret = prefix;
+ prefix = NULL;
+
+ return 0;
+}
+
static void icmp6_nd_notify(sd_icmp6_nd *nd, int event)
{
if (nd->callback)
sd_icmp6_nd *sd_icmp6_nd_unref(sd_icmp6_nd *nd) {
if (nd && REFCNT_DEC(nd->n_ref) == 0) {
+ ICMP6Prefix *prefix, *p;
icmp6_nd_init(nd);
sd_icmp6_nd_detach_event(nd);
+ LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) {
+ LIST_REMOVE(prefixes, nd->prefixes, prefix);
+
+ prefix = icmp6_prefix_unref(prefix);
+ }
+
free(nd);
}
nd->index = -1;
nd->fd = -1;
+ LIST_HEAD_INIT(nd->prefixes);
+
*ret = nd;
nd = NULL;
return 0;
}
+int sd_icmp6_ra_get_mtu(sd_icmp6_nd *nd, uint32_t *mtu) {
+ assert_return(nd, -EINVAL);
+ assert_return(mtu, -EINVAL);
+
+ if (nd->mtu == 0)
+ return -ENOMSG;
+
+ *mtu = nd->mtu;
+
+ return 0;
+}
+
static int icmp6_ra_parse(sd_icmp6_nd *nd, struct nd_router_advert *ra,
ssize_t len) {
void *opt;
opt_hdr = opt;
while (len != 0 && len >= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS) {
+ struct nd_opt_mtu *opt_mtu;
+ uint32_t mtu;
if (opt_hdr->nd_opt_len == 0)
return -ENOMSG;
switch (opt_hdr->nd_opt_type) {
+ case ND_OPT_MTU:
+ opt_mtu = opt;
+
+ mtu = be32toh(opt_mtu->nd_opt_mtu_mtu);
+
+ if (mtu != nd->mtu) {
+ nd->mtu = MAX(mtu, IP6_MIN_MTU);
+
+ log_icmp6_nd(nd, "Router Advertisement link MTU %d using %d",
+ mtu, nd->mtu);
+ }
+
+ break;
}