/* * Handle incoming frames * Linux ethernet bridge * * Authors: * Lennert Buytenhek * * $Id: br_input.c,v 1.9.2.1 2001/12/24 04:50:05 davem Exp $ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include #include "br_private.h" unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; static int br_pass_frame_up_finish(struct sk_buff *skb) { netif_rx(skb); return 0; } static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb) { struct net_device *indev; br->statistics.rx_packets++; br->statistics.rx_bytes += skb->len; indev = skb->dev; skb->dev = &br->dev; skb->pkt_type = PACKET_HOST; skb_push(skb, ETH_HLEN); skb->protocol = eth_type_trans(skb, &br->dev); NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL, br_pass_frame_up_finish); } static int br_handle_frame_finish(struct sk_buff *skb) { struct net_bridge *br; unsigned char *dest; struct net_bridge_fdb_entry *dst; struct net_bridge_port *p; int passedup; dest = skb->mac.ethernet->h_dest; p = skb->dev->br_port; if (p == NULL) goto err_nolock; br = p->br; read_lock(&br->lock); if (skb->dev->br_port == NULL) goto err; passedup = 0; if (br->dev.flags & IFF_PROMISC) { struct sk_buff *skb2; skb2 = skb_clone(skb, GFP_ATOMIC); if (skb2 != NULL) { passedup = 1; br_pass_frame_up(br, skb2); } } if (dest[0] & 1) { br_flood_forward(br, skb, !passedup); if (!passedup) br_pass_frame_up(br, skb); goto out; } dst = br_fdb_get(br, dest); if (dst != NULL && dst->is_local) { if (!passedup) br_pass_frame_up(br, skb); else kfree_skb(skb); br_fdb_put(dst); goto out; } if (dst != NULL) { br_forward(dst->dst, skb); br_fdb_put(dst); goto out; } br_flood_forward(br, skb, 0); out: read_unlock(&br->lock); return 0; err: read_unlock(&br->lock); err_nolock: kfree_skb(skb); return 0; } void br_handle_frame(struct sk_buff *skb) { struct net_bridge *br; unsigned char *dest; struct net_bridge_port *p; dest = skb->mac.ethernet->h_dest; p = skb->dev->br_port; if (p == NULL) goto err_nolock; br = p->br; read_lock(&br->lock); if (skb->dev->br_port == NULL) goto err; if (!(br->dev.flags & IFF_UP) || p->state == BR_STATE_DISABLED) goto err; if (skb->mac.ethernet->h_source[0] & 1) goto err; if (p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING) br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0); if (br->stp_enabled && !memcmp(dest, bridge_ula, 5) && !(dest[5] & 0xF0)) goto handle_special_frame; if (p->state == BR_STATE_FORWARDING) { NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, br_handle_frame_finish); read_unlock(&br->lock); return; } err: read_unlock(&br->lock); err_nolock: kfree_skb(skb); return; handle_special_frame: if (!dest[5]) { br_stp_handle_bpdu(skb); return; } kfree_skb(skb); }