diff options
Diffstat (limited to 'net/batman-adv/routing.c')
| -rw-r--r-- | net/batman-adv/routing.c | 193 |
1 files changed, 120 insertions, 73 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index d343382e9664..12c16f81cc51 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -1,5 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 -/* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors: +/* Copyright (C) B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich */ @@ -29,12 +29,10 @@ #include "distributed-arp-table.h" #include "fragmentation.h" #include "hard-interface.h" -#include "icmp_socket.h" #include "log.h" -#include "network-coding.h" +#include "mesh-interface.h" #include "originator.h" #include "send.h" -#include "soft-interface.h" #include "tp_meter.h" #include "translation-table.h" #include "tvlv.h" @@ -44,7 +42,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb, /** * _batadv_update_route() - set the router for this originator - * @bat_priv: the bat priv with all the soft interface information + * @bat_priv: the bat priv with all the mesh interface information * @orig_node: orig node which is to be configured * @recv_if: the receive interface for which this route is set * @neigh_node: neighbor which should be the next router @@ -102,13 +100,12 @@ static void _batadv_update_route(struct batadv_priv *bat_priv, } /* decrease refcount of previous best neighbor */ - if (curr_router) - batadv_neigh_node_put(curr_router); + batadv_neigh_node_put(curr_router); } /** * batadv_update_route() - set the router for this originator - * @bat_priv: the bat priv with all the soft interface information + * @bat_priv: the bat priv with all the mesh interface information * @orig_node: orig node which is to be configured * @recv_if: the receive interface for which this route is set * @neigh_node: neighbor which should be the next router @@ -129,14 +126,13 @@ void batadv_update_route(struct batadv_priv *bat_priv, _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); out: - if (router) - batadv_neigh_node_put(router); + batadv_neigh_node_put(router); } /** * batadv_window_protected() - checks whether the host restarted and is in the * protection time. - * @bat_priv: the bat priv with all the soft interface information + * @bat_priv: the bat priv with all the mesh interface information * @seq_num_diff: difference between the current/received sequence number and * the last sequence number * @seq_old_max_diff: maximum age of sequence number not considered as restart @@ -210,7 +206,7 @@ bool batadv_check_management_packet(struct sk_buff *skb, /** * batadv_recv_my_icmp_packet() - receive an icmp packet locally - * @bat_priv: the bat priv with all the soft interface information + * @bat_priv: the bat priv with all the mesh interface information * @skb: icmp packet to process * * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP @@ -227,15 +223,6 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, icmph = (struct batadv_icmp_header *)skb->data; switch (icmph->msg_type) { - case BATADV_ECHO_REPLY: - case BATADV_DESTINATION_UNREACHABLE: - case BATADV_TTL_EXCEEDED: - /* receive the packet */ - if (skb_linearize(skb) < 0) - break; - - batadv_socket_receive_packet(icmph, skb->len); - break; case BATADV_ECHO_REQUEST: /* answer echo request (ping) */ primary_if = batadv_primary_if_get_selected(bat_priv); @@ -279,10 +266,8 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, goto out; } out: - if (primary_if) - batadv_hardif_put(primary_if); - if (orig_node) - batadv_orig_node_put(orig_node); + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); kfree_skb(skb); @@ -334,10 +319,8 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, skb = NULL; out: - if (primary_if) - batadv_hardif_put(primary_if); - if (orig_node) - batadv_orig_node_put(orig_node); + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); kfree_skb(skb); @@ -354,7 +337,7 @@ out: int batadv_recv_icmp_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) { - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_priv *bat_priv = netdev_priv(recv_if->mesh_iface); struct batadv_icmp_header *icmph; struct batadv_icmp_packet_rr *icmp_packet_rr; struct ethhdr *ethhdr; @@ -435,8 +418,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, skb = NULL; put_orig_node: - if (orig_node) - batadv_orig_node_put(orig_node); + batadv_orig_node_put(orig_node); free_skb: kfree_skb(skb); @@ -445,11 +427,11 @@ free_skb: /** * batadv_check_unicast_packet() - Check for malformed unicast packets - * @bat_priv: the bat priv with all the soft interface information + * @bat_priv: the bat priv with all the mesh interface information * @skb: packet to check * @hdr_size: size of header to pull * - * Check for short header and bad addresses in given packet. + * Checks for short header and bad addresses in the given packet. * * Return: negative value when check fails and 0 otherwise. The negative value * depends on the reason: -ENODATA for bad header, -EBADR for broadcast @@ -523,13 +505,12 @@ batadv_last_bonding_replace(struct batadv_orig_node *orig_node, orig_node->last_bonding_candidate = new_candidate; spin_unlock_bh(&orig_node->neigh_list_lock); - if (old_candidate) - batadv_orig_ifinfo_put(old_candidate); + batadv_orig_ifinfo_put(old_candidate); } /** * batadv_find_router() - find a suitable router for this originator - * @bat_priv: the bat priv with all the soft interface information + * @bat_priv: the bat priv with all the mesh interface information * @orig_node: the destination node * @recv_if: pointer to interface this packet was received on * @@ -666,8 +647,7 @@ next: batadv_orig_ifinfo_put(next_candidate); } - if (last_candidate) - batadv_orig_ifinfo_put(last_candidate); + batadv_orig_ifinfo_put(last_candidate); return router; } @@ -675,7 +655,7 @@ next: static int batadv_route_unicast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) { - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_priv *bat_priv = netdev_priv(recv_if->mesh_iface); struct batadv_orig_node *orig_node = NULL; struct batadv_unicast_packet *unicast_packet; struct ethhdr *ethhdr = eth_hdr(skb); @@ -746,7 +726,7 @@ free_skb: /** * batadv_reroute_unicast_packet() - update the unicast header for re-routing - * @bat_priv: the bat priv with all the soft interface information + * @bat_priv: the bat priv with all the mesh interface information * @skb: unicast packet to process * @unicast_packet: the unicast header to be updated * @dst_addr: the payload destination @@ -766,7 +746,8 @@ batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, struct batadv_orig_node *orig_node = NULL; struct batadv_hard_iface *primary_if = NULL; bool ret = false; - u8 *orig_addr, orig_ttvn; + const u8 *orig_addr; + u8 orig_ttvn; if (batadv_is_my_client(bat_priv, dst_addr, vid)) { primary_if = batadv_primary_if_get_selected(bat_priv); @@ -795,10 +776,8 @@ batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, ret = true; out: - if (primary_if) - batadv_hardif_put(primary_if); - if (orig_node) - batadv_orig_node_put(orig_node); + batadv_hardif_put(primary_if); + batadv_orig_node_put(orig_node); return ret; } @@ -826,6 +805,10 @@ static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, vid = batadv_get_vid(skb, hdr_len); ethhdr = (struct ethhdr *)(skb->data + hdr_len); + /* do not reroute multicast frames in a unicast header */ + if (is_multicast_ether_addr(ethhdr->h_dest)) + return true; + /* check if the destination client was served by this node and it is now * roaming. In this case, it means that the node has got a ROAM_ADV * message and that it knows the new destination in the mesh to re-route @@ -895,7 +878,7 @@ static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, return false; /* update the header in order to let the packet be delivered to this - * node's soft interface + * node's mesh interface */ primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) @@ -925,7 +908,7 @@ 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); + struct batadv_priv *bat_priv = netdev_priv(recv_if->mesh_iface); int check, hdr_size = sizeof(*unicast_packet); check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); @@ -954,7 +937,7 @@ free_skb: int batadv_recv_unicast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) { - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_priv *bat_priv = netdev_priv(recv_if->mesh_iface); struct batadv_unicast_packet *unicast_packet; struct batadv_unicast_4addr_packet *unicast_4addr_packet; u8 *orig_addr, *orig_addr_gw; @@ -972,15 +955,9 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, /* function returns -EREMOTE for promiscuous packets */ check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); - - /* Even though the packet is not for us, we might save it to use for - * decoding a later received coded packet - */ - if (check == -EREMOTE) - batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); - if (check < 0) goto free_skb; + if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) goto free_skb; @@ -1033,12 +1010,11 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); - batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, + batadv_interface_rx(recv_if->mesh_iface, skb, hdr_size, orig_node); rx_success: - if (orig_node) - batadv_orig_node_put(orig_node); + batadv_orig_node_put(orig_node); return NET_RX_SUCCESS; } @@ -1064,7 +1040,7 @@ free_skb: 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_priv *bat_priv = netdev_priv(recv_if->mesh_iface); struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; unsigned char *tvlv_buff; u16 tvlv_buff_len; @@ -1090,10 +1066,9 @@ int batadv_recv_unicast_tvlv(struct sk_buff *skb, if (tvlv_buff_len > skb->len - hdr_size) goto free_skb; - ret = batadv_tvlv_containers_process(bat_priv, false, NULL, - unicast_tvlv_packet->src, - unicast_tvlv_packet->dst, - tvlv_buff, tvlv_buff_len); + ret = batadv_tvlv_containers_process(bat_priv, BATADV_UNICAST_TVLV, + NULL, skb, tvlv_buff, + tvlv_buff_len); if (ret != NET_RX_SUCCESS) { ret = batadv_route_unicast_packet(skb, recv_if); @@ -1113,7 +1088,7 @@ free_skb: * @recv_if: interface that the skb is received on * * This function does one of the three following things: 1) Forward fragment, if - * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till + * the assembled packet will exceed our MTU; 2) Buffer fragment, if we still * lack further fragments; 3) Merge fragments, if we have all needed parts. * * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. @@ -1121,7 +1096,7 @@ free_skb: int batadv_recv_frag_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) { - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_priv *bat_priv = netdev_priv(recv_if->mesh_iface); struct batadv_orig_node *orig_node_src = NULL; struct batadv_frag_packet *frag_packet; int ret = NET_RX_DROP; @@ -1183,14 +1158,14 @@ free_skb: int batadv_recv_bcast_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) { - struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_priv *bat_priv = netdev_priv(recv_if->mesh_iface); struct batadv_orig_node *orig_node = NULL; struct batadv_bcast_packet *bcast_packet; struct ethhdr *ethhdr; int hdr_size = sizeof(*bcast_packet); - int ret = NET_RX_DROP; s32 seq_diff; u32 seqno; + int ret; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) @@ -1216,7 +1191,7 @@ int batadv_recv_bcast_packet(struct sk_buff *skb, if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) goto free_skb; - if (bcast_packet->ttl < 2) + if (bcast_packet->ttl-- < 2) goto free_skb; orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); @@ -1255,7 +1230,9 @@ int batadv_recv_bcast_packet(struct sk_buff *skb, batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); /* rebroadcast packet */ - batadv_add_bcast_packet_to_list(bat_priv, skb, 1, false); + ret = batadv_forw_bcast_packet(bat_priv, skb, 0, false); + if (ret == NETDEV_TX_BUSY) + goto free_skb; /* don't hand the broadcast up if it is from an originator * from the same backbone. @@ -1271,7 +1248,7 @@ int batadv_recv_bcast_packet(struct sk_buff *skb, batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); /* broadcast for me */ - batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); + batadv_interface_rx(recv_if->mesh_iface, skb, hdr_size, orig_node); rx_success: ret = NET_RX_SUCCESS; @@ -1281,8 +1258,78 @@ spin_unlock: spin_unlock_bh(&orig_node->bcast_seqno_lock); free_skb: kfree_skb(skb); + ret = NET_RX_DROP; out: - if (orig_node) - batadv_orig_node_put(orig_node); + batadv_orig_node_put(orig_node); + return ret; +} + +#ifdef CONFIG_BATMAN_ADV_MCAST +/** + * batadv_recv_mcast_packet() - process received batman-adv multicast packet + * @skb: the received batman-adv multicast packet + * @recv_if: interface that the skb is received on + * + * Parses the given, received batman-adv multicast packet. Depending on the + * contents of its TVLV forwards it and/or decapsulates it to hand it to the + * mesh interface. + * + * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. + */ +int batadv_recv_mcast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->mesh_iface); + struct batadv_mcast_packet *mcast_packet; + int hdr_size = sizeof(*mcast_packet); + unsigned char *tvlv_buff; + int ret = NET_RX_DROP; + u16 tvlv_buff_len; + + if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) + goto free_skb; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto free_skb; + + /* packet needs to be linearized to access the tvlv content */ + if (skb_linearize(skb) < 0) + goto free_skb; + + mcast_packet = (struct batadv_mcast_packet *)skb->data; + if (mcast_packet->ttl-- < 2) + goto free_skb; + + tvlv_buff = (unsigned char *)(skb->data + hdr_size); + tvlv_buff_len = ntohs(mcast_packet->tvlv_len); + + if (tvlv_buff_len > skb->len - hdr_size) + goto free_skb; + + ret = batadv_tvlv_containers_process(bat_priv, BATADV_MCAST, NULL, skb, + tvlv_buff, tvlv_buff_len); + if (ret >= 0) { + batadv_inc_counter(bat_priv, BATADV_CNT_MCAST_RX); + batadv_add_counter(bat_priv, BATADV_CNT_MCAST_RX_BYTES, + skb->len + ETH_HLEN); + } + + hdr_size += tvlv_buff_len; + + if (ret == NET_RX_SUCCESS && (skb->len - hdr_size >= ETH_HLEN)) { + batadv_inc_counter(bat_priv, BATADV_CNT_MCAST_RX_LOCAL); + batadv_add_counter(bat_priv, BATADV_CNT_MCAST_RX_LOCAL_BYTES, + skb->len - hdr_size); + + batadv_interface_rx(bat_priv->mesh_iface, skb, hdr_size, NULL); + /* skb was consumed */ + skb = NULL; + } + +free_skb: + kfree_skb(skb); + return ret; } +#endif /* CONFIG_BATMAN_ADV_MCAST */ |