/* Sends the given 'command' to datapath 'dp', related to the local datapath * numbered 'dp_idx'. If 'arg' is nonnull, adds it to the command as the * datapath or port name attribute depending on the requested operation. * Returns 0 if successful, otherwise a positive errno value. */ static int send_mgmt_command(struct dpif *dp, int dp_idx, int command, const char *arg) { struct ofpbuf request, *reply; int retval; ofpbuf_init(&request, 0); nl_msg_put_genlmsghdr(&request, dp->sock, 32, openflow_family, NLM_F_REQUEST | NLM_F_ACK, command, 1); if (dp_idx != -1) { nl_msg_put_u32(&request, DP_GENL_A_DP_IDX, dp_idx); } if (arg) { if ((command == DP_GENL_C_ADD_DP) || (command == DP_GENL_C_DEL_DP)) { nl_msg_put_string(&request, DP_GENL_A_DP_NAME, arg); } else { nl_msg_put_string(&request, DP_GENL_A_PORTNAME, arg); } } retval = nl_sock_transact(dp->sock, &request, &reply); ofpbuf_uninit(&request); ofpbuf_delete(reply); return retval; }
static int lookup_brc_multicast_group(int *multicast_group) { struct nl_sock *sock; struct ofpbuf request, *reply; struct nlattr *attrs[ARRAY_SIZE(brc_multicast_policy)]; int retval; retval = nl_sock_create(NETLINK_GENERIC, &sock); if (retval) { return retval; } ofpbuf_init(&request, 0); nl_msg_put_genlmsghdr(&request, 0, brc_family, NLM_F_REQUEST, BRC_GENL_C_QUERY_MC, 1); retval = nl_sock_transact(sock, &request, &reply); ofpbuf_uninit(&request); if (retval) { nl_sock_destroy(sock); return retval; } if (!nl_policy_parse(reply, NLMSG_HDRLEN + GENL_HDRLEN, brc_multicast_policy, attrs, ARRAY_SIZE(brc_multicast_policy))) { nl_sock_destroy(sock); ofpbuf_delete(reply); return EPROTO; } *multicast_group = nl_attr_get_u32(attrs[BRC_GENL_A_MC_GROUP]); nl_sock_destroy(sock); ofpbuf_delete(reply); return 0; }
/* Looks up the Netlink multicast group and datapath index of a datapath * by either the datapath index or name. If 'dp_idx' points to a value * of '-1', then 'dp_name' is used to lookup the datapath. If successful, * stores the multicast group in '*multicast_group' and the index in * '*dp_idx' and returns 0. Otherwise, returns a positive errno value. */ static int query_datapath(int *dp_idx, int *multicast_group, const char *dp_name) { struct nl_sock *sock; struct ofpbuf request, *reply; struct nlattr *attrs[ARRAY_SIZE(openflow_multicast_policy)]; int retval; retval = nl_sock_create(NETLINK_GENERIC, 0, 0, 0, &sock); if (retval) { return retval; } ofpbuf_init(&request, 0); nl_msg_put_genlmsghdr(&request, sock, 0, openflow_family, NLM_F_REQUEST, DP_GENL_C_QUERY_DP, 1); if (*dp_idx != -1) { nl_msg_put_u32(&request, DP_GENL_A_DP_IDX, *dp_idx); } if (dp_name) { nl_msg_put_string(&request, DP_GENL_A_DP_NAME, dp_name); } retval = nl_sock_transact(sock, &request, &reply); ofpbuf_uninit(&request); if (retval) { nl_sock_destroy(sock); return retval; } if (!nl_policy_parse(reply, NLMSG_HDRLEN + GENL_HDRLEN, openflow_multicast_policy, attrs, ARRAY_SIZE(openflow_multicast_policy))) { nl_sock_destroy(sock); ofpbuf_delete(reply); return EPROTO; } *dp_idx = nl_attr_get_u32(attrs[DP_GENL_A_DP_IDX]); *multicast_group = nl_attr_get_u32(attrs[DP_GENL_A_MC_GROUP]); nl_sock_destroy(sock); ofpbuf_delete(reply); return 0; }