diff options
Diffstat (limited to 'net/batman-adv/soft-interface.c')
-rw-r--r-- | net/batman-adv/soft-interface.c | 76 |
1 files changed, 41 insertions, 35 deletions
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 3686be7..b569932 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -160,6 +160,8 @@ static int batadv_interface_tx(struct sk_buff *skb, 0x00, 0x00}; static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 0x00, 0x00}; + enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; + uint8_t *dst_hint = NULL, chaddr[ETH_ALEN]; struct vlan_ethhdr *vhdr; unsigned int header_len = 0; int data_len = skb->len, ret; @@ -167,6 +169,7 @@ static int batadv_interface_tx(struct sk_buff *skb, bool do_bcast = false, client_added; unsigned short vid; uint32_t seqno; + int gw_mode; if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) goto dropped; @@ -213,36 +216,39 @@ static int batadv_interface_tx(struct sk_buff *skb, if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) goto dropped; + gw_mode = atomic_read(&bat_priv->gw_mode); if (is_multicast_ether_addr(ethhdr->h_dest)) { - do_bcast = true; - - switch (atomic_read(&bat_priv->gw_mode)) { - case BATADV_GW_MODE_SERVER: - /* gateway servers should not send dhcp - * requests into the mesh - */ - ret = batadv_gw_is_dhcp_target(skb, &header_len); - if (ret) - goto dropped; - break; - case BATADV_GW_MODE_CLIENT: - /* gateway clients should send dhcp requests - * via unicast to their gateway - */ - ret = batadv_gw_is_dhcp_target(skb, &header_len); - if (ret) - do_bcast = false; - break; - case BATADV_GW_MODE_OFF: - default: - break; + /* if gw mode is off, broadcast every packet */ + if (gw_mode == BATADV_GW_MODE_OFF) { + do_bcast = true; + goto send; } - /* reminder: ethhdr might have become unusable from here on - * (batadv_gw_is_dhcp_target() might have reallocated skb data) + dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, + chaddr); + /* skb->data may have been modified by + * batadv_gw_dhcp_recipient_get() */ + ethhdr = (struct ethhdr *)skb->data; + /* if gw_mode is on, broadcast any non-DHCP message. + * All the DHCP packets are going to be sent as unicast + */ + if (dhcp_rcp == BATADV_DHCP_NO) { + do_bcast = true; + goto send; + } + + if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) + dst_hint = chaddr; + else if ((gw_mode == BATADV_GW_MODE_SERVER) && + (dhcp_rcp == BATADV_DHCP_TO_SERVER)) + /* gateways should not forward any DHCP message if + * directed to a DHCP server + */ + goto dropped; } +send: batadv_skb_set_priority(skb, 0); /* ethernet packet should be broadcasted */ @@ -288,22 +294,22 @@ static int batadv_interface_tx(struct sk_buff *skb, /* unicast packet */ } else { - if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_OFF) { + /* DHCP packets going to a server will use the GW feature */ + if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { ret = batadv_gw_out_of_range(bat_priv, skb); if (ret) goto dropped; - } - - if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) - goto dropped; - - batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); - - if (is_multicast_ether_addr(ethhdr->h_dest)) ret = batadv_send_skb_via_gw(bat_priv, skb, vid); - else - ret = batadv_send_skb_via_tt(bat_priv, skb, vid); + } else { + if (batadv_dat_snoop_outgoing_arp_request(bat_priv, + skb)) + goto dropped; + batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); + + ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, + vid); + } if (ret == NET_XMIT_DROP) goto dropped_freed; } |