inet: Get router advertisement prefix option information.

diff --git a/src/connman.h b/src/connman.h
index e42cbe1..e8c6187 100644 (file)
--- a/src/connman.h
+++ b/src/connman.h
@@ -141,6 +141,8 @@ typedef void (*__connman_inet_rs_cb_t) (struct nd_router_advert *reply,
 
 int __connman_inet_ipv6_send_rs(int index, int timeout,
                        __connman_inet_rs_cb_t callback, void *user_data);
+GSList *__connman_inet_ipv6_get_prefixes(struct nd_router_advert *hdr,
+                                       unsigned int length);
 
 #include <connman/resolver.h>
 

diff --git a/src/inet.c b/src/inet.c
index a659ab0..d9e12a9 100644 (file)
--- a/src/inet.c
+++ b/src/inet.c
@@ -1722,3 +1722,53 @@ int __connman_inet_ipv6_send_rs(int index, int timeout,
 
        return 0;
 }
+
+GSList *__connman_inet_ipv6_get_prefixes(struct nd_router_advert *hdr,
+                                       unsigned int length)
+{
+       GSList *prefixes = NULL;
+       uint8_t *pos;
+       int len;
+
+       if (length <= sizeof(struct nd_router_advert))
+               return NULL;
+
+       len = length - sizeof(struct nd_router_advert);
+       pos = (uint8_t *)hdr + sizeof(struct nd_router_advert);
+
+       while (len > 0) {
+               struct nd_opt_prefix_info *pinfo;
+               char prefix_str[INET6_ADDRSTRLEN+1], *str;
+               const char *prefix;
+               int optlen;
+
+               if (len < 2)
+                       break;
+
+               optlen = pos[1] << 3;
+               if (optlen == 0 || optlen > len)
+                       break;
+
+               switch (pos[0]) {
+               case ND_OPT_PREFIX_INFORMATION:
+                       pinfo = (struct nd_opt_prefix_info *)pos;
+                       prefix = inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
+                                       prefix_str, INET6_ADDRSTRLEN);
+                       if (prefix == NULL)
+                               break;
+
+                       str = g_strdup_printf("%s/%d", prefix,
+                                               pinfo->nd_opt_pi_prefix_len);
+                       prefixes = g_slist_append(prefixes, str);
+
+                       DBG("prefix %s", str);
+
+                       break;
+               }
+
+               len -= optlen;
+               pos += optlen;
+       }
+
+       return prefixes;
+}