diff options
Diffstat (limited to 'net/batman-adv/routing.c')
-rw-r--r-- | net/batman-adv/routing.c | 247 |
1 files changed, 76 insertions, 171 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 0439395..457dfef 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -25,7 +25,6 @@ #include "icmp_socket.h" #include "translation-table.h" #include "originator.h" -#include "vis.h" #include "unicast.h" #include "bridge_loop_avoidance.h" #include "distributed-arp-table.h" @@ -557,126 +556,6 @@ static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, return 0; } -int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if) -{ - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); - struct batadv_tt_query_packet *tt_query; - uint16_t tt_size; - int hdr_size = sizeof(*tt_query); - char tt_flag; - size_t packet_size; - - if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) - return NET_RX_DROP; - - /* I could need to modify it */ - if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0) - goto out; - - tt_query = (struct batadv_tt_query_packet *)skb->data; - - switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) { - case BATADV_TT_REQUEST: - batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); - - /* If we cannot provide an answer the tt_request is - * forwarded - */ - if (!batadv_send_tt_response(bat_priv, tt_query)) { - if (tt_query->flags & BATADV_TT_FULL_TABLE) - tt_flag = 'F'; - else - tt_flag = '.'; - - batadv_dbg(BATADV_DBG_TT, bat_priv, - "Routing TT_REQUEST to %pM [%c]\n", - tt_query->dst, - tt_flag); - return batadv_route_unicast_packet(skb, recv_if); - } - break; - case BATADV_TT_RESPONSE: - batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); - - if (batadv_is_my_mac(bat_priv, tt_query->dst)) { - /* packet needs to be linearized to access the TT - * changes - */ - if (skb_linearize(skb) < 0) - goto out; - /* skb_linearize() possibly changed skb->data */ - tt_query = (struct batadv_tt_query_packet *)skb->data; - - tt_size = batadv_tt_len(ntohs(tt_query->tt_data)); - - /* Ensure we have all the claimed data */ - packet_size = sizeof(struct batadv_tt_query_packet); - packet_size += tt_size; - if (unlikely(skb_headlen(skb) < packet_size)) - goto out; - - batadv_handle_tt_response(bat_priv, tt_query); - } else { - if (tt_query->flags & BATADV_TT_FULL_TABLE) - tt_flag = 'F'; - else - tt_flag = '.'; - batadv_dbg(BATADV_DBG_TT, bat_priv, - "Routing TT_RESPONSE to %pM [%c]\n", - tt_query->dst, - tt_flag); - return batadv_route_unicast_packet(skb, recv_if); - } - break; - } - -out: - /* returning NET_RX_DROP will make the caller function kfree the skb */ - return NET_RX_DROP; -} - -int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if) -{ - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); - struct batadv_roam_adv_packet *roam_adv_packet; - struct batadv_orig_node *orig_node; - - if (batadv_check_unicast_packet(bat_priv, skb, - sizeof(*roam_adv_packet)) < 0) - goto out; - - batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); - - roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data; - - if (!batadv_is_my_mac(bat_priv, roam_adv_packet->dst)) - return batadv_route_unicast_packet(skb, recv_if); - - /* check if it is a backbone gateway. we don't accept - * roaming advertisement from it, as it has the same - * entries as we have. - */ - if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) - goto out; - - orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src); - if (!orig_node) - goto out; - - batadv_dbg(BATADV_DBG_TT, bat_priv, - "Received ROAMING_ADV from %pM (client %pM)\n", - roam_adv_packet->src, roam_adv_packet->client); - - batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client, - BATADV_TT_CLIENT_ROAM, - atomic_read(&orig_node->last_ttvn) + 1); - - batadv_orig_node_free_ref(orig_node); -out: - /* returning NET_RX_DROP will make the caller function kfree the skb */ - return NET_RX_DROP; -} - /* find a suitable router for this originator, and use * bonding if possible. increases the found neighbors * refcount. @@ -1032,6 +911,34 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, return 1; } +/** + * batadv_recv_unhandled_unicast_packet - receive and process packets which + * are in the unicast number space but not yet known to the implementation + * @skb: unicast tvlv packet to process + * @recv_if: pointer to interface this packet was received on + * + * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_unicast_packet *unicast_packet; + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + int check, hdr_size = sizeof(*unicast_packet); + + check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); + if (check < 0) + return NET_RX_DROP; + + /* we don't know about this type, drop it. */ + unicast_packet = (struct batadv_unicast_packet *)skb->data; + if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) + return NET_RX_DROP; + + return batadv_route_unicast_packet(skb, recv_if); +} + int batadv_recv_unicast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) { @@ -1139,6 +1046,54 @@ rx_success: return batadv_route_unicast_packet(skb, recv_if); } +/** + * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets + * @skb: unicast tvlv packet to process + * @recv_if: pointer to interface this packet was received on + * @dst_addr: the payload destination + * + * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +int batadv_recv_unicast_tvlv(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; + unsigned char *tvlv_buff; + uint16_t tvlv_buff_len; + int hdr_size = sizeof(*unicast_tvlv_packet); + int ret = NET_RX_DROP; + + if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) + return NET_RX_DROP; + + /* the header is likely to be modified while forwarding */ + if (skb_cow(skb, hdr_size) < 0) + return NET_RX_DROP; + + /* packet needs to be linearized to access the tvlv content */ + if (skb_linearize(skb) < 0) + return NET_RX_DROP; + + unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; + + tvlv_buff = (unsigned char *)(skb->data + hdr_size); + tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); + + if (tvlv_buff_len > skb->len - hdr_size) + return NET_RX_DROP; + + ret = batadv_tvlv_containers_process(bat_priv, false, NULL, + unicast_tvlv_packet->src, + unicast_tvlv_packet->dst, + tvlv_buff, tvlv_buff_len); + + if (ret != NET_RX_SUCCESS) + ret = batadv_route_unicast_packet(skb, recv_if); + + return ret; +} int batadv_recv_bcast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) @@ -1240,53 +1195,3 @@ out: batadv_orig_node_free_ref(orig_node); return ret; } - -int batadv_recv_vis_packet(struct sk_buff *skb, - struct batadv_hard_iface *recv_if) -{ - struct batadv_vis_packet *vis_packet; - struct ethhdr *ethhdr; - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); - int hdr_size = sizeof(*vis_packet); - - /* keep skb linear */ - if (skb_linearize(skb) < 0) - return NET_RX_DROP; - - if (unlikely(!pskb_may_pull(skb, hdr_size))) - return NET_RX_DROP; - - vis_packet = (struct batadv_vis_packet *)skb->data; - ethhdr = eth_hdr(skb); - - /* not for me */ - if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) - return NET_RX_DROP; - - /* ignore own packets */ - if (batadv_is_my_mac(bat_priv, vis_packet->vis_orig)) - return NET_RX_DROP; - - if (batadv_is_my_mac(bat_priv, vis_packet->sender_orig)) - return NET_RX_DROP; - - switch (vis_packet->vis_type) { - case BATADV_VIS_TYPE_SERVER_SYNC: - batadv_receive_server_sync_packet(bat_priv, vis_packet, - skb_headlen(skb)); - break; - - case BATADV_VIS_TYPE_CLIENT_UPDATE: - batadv_receive_client_update_packet(bat_priv, vis_packet, - skb_headlen(skb)); - break; - - default: /* ignore unknown packet */ - break; - } - - /* We take a copy of the data in the packet, so we should - * always free the skbuf. - */ - return NET_RX_DROP; -} |