set TTL socket option

diff --git a/src/listen/bfd/proto_bfd_udp.c b/src/listen/bfd/proto_bfd_udp.c
index 4f92a4c877b88a4020677e9b2e558e4e0769e898..99d74576ac30fcc75339a9ef6aeb51a21141ef39 100644 (file)
--- a/src/listen/bfd/proto_bfd_udp.c
+++ b/src/listen/bfd/proto_bfd_udp.c
@@ -57,11 +57,13 @@ typedef struct {
 
        uint16_t                        port;                   //!< Port to listen on.
 
+       uint8_t                         ttl;                    //!< default ttl
+
        bool                            recv_buff_is_set;       //!< Whether we were provided with a recv_buff
        bool                            send_buff_is_set;       //!< Whether we were provided with a send_buff
        bool                            dynamic_clients;        //!< whether we have dynamic clients
 
-       fr_client_list_t                        *clients;               //!< local clients
+       fr_client_list_t                *clients;               //!< local clients
 
        fr_trie_t                       *trie;                  //!< for parsed networks
        fr_ipaddr_t                     *allow;                 //!< allowed networks for dynamic clients
@@ -87,6 +89,8 @@ static const CONF_PARSER udp_listen_config[] = {
 
        { FR_CONF_OFFSET("port", FR_TYPE_UINT16, proto_bfd_udp_t, port) },
 
+       { FR_CONF_OFFSET("ttl", FR_TYPE_UINT8, proto_bfd_udp_t, ttl), .dflt = "255" },
+
        { FR_CONF_OFFSET_IS_SET("recv_buff", FR_TYPE_UINT32, proto_bfd_udp_t, recv_buff) },
        { FR_CONF_OFFSET_IS_SET("send_buff", FR_TYPE_UINT32, proto_bfd_udp_t, send_buff) },
 
@@ -258,6 +262,17 @@ static int mod_open(fr_listen_t *li)
        }
 #endif
 
+#ifdef IP_TTL
+       {
+               int opt;
+
+               opt = inst->ttl;
+               if (setsockopt(sockfd, IPPROTO_IP, IP_TTL, &opt, sizeof(opt)) < 0) {
+                       WARN("Failed setting 'ttl': %s", fr_syserror(errno));
+               }
+       }
+#endif
+
        if (fr_socket_bind(sockfd, &inst->ipaddr, &port, inst->interface) < 0) {
                close(sockfd);
                PERROR("Failed binding socket");
@@ -330,6 +345,8 @@ static int mod_bootstrap(module_inst_ctx_t const *mctx)
                FR_INTEGER_BOUND_CHECK("send_buff", inst->send_buff, <=, (1 << 30));
        }
 
+       FR_INTEGER_BOUND_CHECK("ttl", inst->ttl, >=, 64);
+
        if (!inst->port) {
                struct servent *s;