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@@ -1,491 +0,0 @@
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-/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
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- *
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- * Andreas Langer
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of version 2 of the GNU General Public
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- * License as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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- * 02110-1301, USA
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- */
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-
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-#include "main.h"
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-#include "unicast.h"
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-#include "send.h"
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-#include "soft-interface.h"
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-#include "gateway_client.h"
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-#include "originator.h"
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-#include "hash.h"
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-#include "translation-table.h"
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-#include "routing.h"
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-#include "hard-interface.h"
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-
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-
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-static struct sk_buff *
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-batadv_frag_merge_packet(struct list_head *head,
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- struct batadv_frag_packet_list_entry *tfp,
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- struct sk_buff *skb)
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-{
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- struct batadv_unicast_frag_packet *up;
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- struct sk_buff *tmp_skb;
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- struct batadv_unicast_packet *unicast_packet;
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- int hdr_len = sizeof(*unicast_packet);
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- int uni_diff = sizeof(*up) - hdr_len;
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- uint8_t *packet_pos;
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-
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- up = (struct batadv_unicast_frag_packet *)skb->data;
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- /* set skb to the first part and tmp_skb to the second part */
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- if (up->flags & BATADV_UNI_FRAG_HEAD) {
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- tmp_skb = tfp->skb;
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- } else {
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- tmp_skb = skb;
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- skb = tfp->skb;
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- }
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-
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- if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0)
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- goto err;
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-
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- skb_pull(tmp_skb, sizeof(*up));
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- if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
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- goto err;
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-
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- /* move free entry to end */
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- tfp->skb = NULL;
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- tfp->seqno = 0;
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- list_move_tail(&tfp->list, head);
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-
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- memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
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- kfree_skb(tmp_skb);
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-
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- memmove(skb->data + uni_diff, skb->data, hdr_len);
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- packet_pos = skb_pull(skb, uni_diff);
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- unicast_packet = (struct batadv_unicast_packet *)packet_pos;
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- unicast_packet->header.packet_type = BATADV_UNICAST;
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-
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- return skb;
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-
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-err:
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- /* free buffered skb, skb will be freed later */
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- kfree_skb(tfp->skb);
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- return NULL;
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-}
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-
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-static void batadv_frag_create_entry(struct list_head *head,
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- struct sk_buff *skb)
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-{
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- struct batadv_frag_packet_list_entry *tfp;
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- struct batadv_unicast_frag_packet *up;
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-
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- up = (struct batadv_unicast_frag_packet *)skb->data;
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-
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- /* free and oldest packets stand at the end */
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- tfp = list_entry((head)->prev, typeof(*tfp), list);
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- kfree_skb(tfp->skb);
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-
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- tfp->seqno = ntohs(up->seqno);
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- tfp->skb = skb;
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- list_move(&tfp->list, head);
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- return;
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-}
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-
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-static int batadv_frag_create_buffer(struct list_head *head)
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-{
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- int i;
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- struct batadv_frag_packet_list_entry *tfp;
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-
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- for (i = 0; i < BATADV_FRAG_BUFFER_SIZE; i++) {
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- tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC);
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- if (!tfp) {
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- batadv_frag_list_free(head);
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- return -ENOMEM;
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- }
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- tfp->skb = NULL;
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- tfp->seqno = 0;
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- INIT_LIST_HEAD(&tfp->list);
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- list_add(&tfp->list, head);
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- }
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-
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- return 0;
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-}
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-
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-static struct batadv_frag_packet_list_entry *
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-batadv_frag_search_packet(struct list_head *head,
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- const struct batadv_unicast_frag_packet *up)
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-{
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- struct batadv_frag_packet_list_entry *tfp;
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- struct batadv_unicast_frag_packet *tmp_up = NULL;
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- bool is_head_tmp, is_head;
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- uint16_t search_seqno;
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-
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- if (up->flags & BATADV_UNI_FRAG_HEAD)
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- search_seqno = ntohs(up->seqno)+1;
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- else
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- search_seqno = ntohs(up->seqno)-1;
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-
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- is_head = up->flags & BATADV_UNI_FRAG_HEAD;
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-
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- list_for_each_entry(tfp, head, list) {
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- if (!tfp->skb)
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- continue;
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-
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- if (tfp->seqno == ntohs(up->seqno))
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- goto mov_tail;
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-
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- tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data;
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-
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- if (tfp->seqno == search_seqno) {
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- is_head_tmp = tmp_up->flags & BATADV_UNI_FRAG_HEAD;
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- if (is_head_tmp != is_head)
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- return tfp;
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- else
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- goto mov_tail;
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- }
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- }
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- return NULL;
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-
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-mov_tail:
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- list_move_tail(&tfp->list, head);
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- return NULL;
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-}
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-
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-void batadv_frag_list_free(struct list_head *head)
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-{
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- struct batadv_frag_packet_list_entry *pf, *tmp_pf;
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-
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- if (!list_empty(head)) {
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- list_for_each_entry_safe(pf, tmp_pf, head, list) {
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- kfree_skb(pf->skb);
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- list_del(&pf->list);
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- kfree(pf);
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- }
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- }
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- return;
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-}
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-
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-/* frag_reassemble_skb():
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- * returns NET_RX_DROP if the operation failed - skb is left intact
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- * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
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- * or the skb could be reassembled (skb_new will point to the new packet and
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- * skb was freed)
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- */
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-int batadv_frag_reassemble_skb(struct sk_buff *skb,
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- struct batadv_priv *bat_priv,
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- struct sk_buff **new_skb)
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-{
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- struct batadv_orig_node *orig_node;
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- struct batadv_frag_packet_list_entry *tmp_frag_entry;
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- int ret = NET_RX_DROP;
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- struct batadv_unicast_frag_packet *unicast_packet;
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-
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- unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
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- *new_skb = NULL;
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-
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- orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig);
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- if (!orig_node)
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- goto out;
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-
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- orig_node->last_frag_packet = jiffies;
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-
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- if (list_empty(&orig_node->frag_list) &&
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- batadv_frag_create_buffer(&orig_node->frag_list)) {
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- pr_debug("couldn't create frag buffer\n");
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- goto out;
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- }
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-
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- tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list,
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- unicast_packet);
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-
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- if (!tmp_frag_entry) {
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- batadv_frag_create_entry(&orig_node->frag_list, skb);
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- ret = NET_RX_SUCCESS;
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- goto out;
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- }
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-
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- *new_skb = batadv_frag_merge_packet(&orig_node->frag_list,
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- tmp_frag_entry, skb);
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- /* if not, merge failed */
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- if (*new_skb)
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- ret = NET_RX_SUCCESS;
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-
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-out:
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- if (orig_node)
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- batadv_orig_node_free_ref(orig_node);
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- return ret;
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-}
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-
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-int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
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- struct batadv_hard_iface *hard_iface,
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- const uint8_t dstaddr[])
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-{
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- struct batadv_unicast_packet tmp_uc, *unicast_packet;
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- struct batadv_hard_iface *primary_if;
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- struct sk_buff *frag_skb;
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- struct batadv_unicast_frag_packet *frag1, *frag2;
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- int uc_hdr_len = sizeof(*unicast_packet);
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- int ucf_hdr_len = sizeof(*frag1);
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- int data_len = skb->len - uc_hdr_len;
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- int large_tail = 0, ret = NET_RX_DROP;
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- uint16_t seqno;
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-
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- primary_if = batadv_primary_if_get_selected(bat_priv);
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- if (!primary_if)
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- goto dropped;
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-
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- frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
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- if (!frag_skb)
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- goto dropped;
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-
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- skb->priority = TC_PRIO_CONTROL;
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- skb_reserve(frag_skb, ucf_hdr_len);
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-
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- unicast_packet = (struct batadv_unicast_packet *)skb->data;
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- memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
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- skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len);
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-
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- if (batadv_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 ||
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- batadv_skb_head_push(frag_skb, ucf_hdr_len) < 0)
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- goto drop_frag;
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-
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- frag1 = (struct batadv_unicast_frag_packet *)skb->data;
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- frag2 = (struct batadv_unicast_frag_packet *)frag_skb->data;
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-
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- memcpy(frag1, &tmp_uc, sizeof(tmp_uc));
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-
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- frag1->header.ttl--;
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- frag1->header.version = BATADV_COMPAT_VERSION;
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- frag1->header.packet_type = BATADV_UNICAST_FRAG;
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-
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- memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
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- memcpy(frag2, frag1, sizeof(*frag2));
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-
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- if (data_len & 1)
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- large_tail = BATADV_UNI_FRAG_LARGETAIL;
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-
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- frag1->flags = BATADV_UNI_FRAG_HEAD | large_tail;
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- frag2->flags = large_tail;
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-
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- seqno = atomic_add_return(2, &hard_iface->frag_seqno);
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- frag1->seqno = htons(seqno - 1);
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- frag2->seqno = htons(seqno);
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-
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- batadv_send_skb_packet(skb, hard_iface, dstaddr);
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- batadv_send_skb_packet(frag_skb, hard_iface, dstaddr);
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- ret = NET_RX_SUCCESS;
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- goto out;
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-
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-drop_frag:
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- kfree_skb(frag_skb);
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-dropped:
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- kfree_skb(skb);
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-out:
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- if (primary_if)
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- batadv_hardif_free_ref(primary_if);
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- return ret;
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-}
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-
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-/**
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- * batadv_unicast_push_and_fill_skb - extends the buffer and initializes the
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- * common fields for unicast packets
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- * @skb: packet
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- * @hdr_size: amount of bytes to push at the beginning of the skb
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- * @orig_node: the destination node
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- *
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- * Returns false if the buffer extension was not possible or true otherwise
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- */
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-static bool batadv_unicast_push_and_fill_skb(struct sk_buff *skb, int hdr_size,
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- struct batadv_orig_node *orig_node)
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-{
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- struct batadv_unicast_packet *unicast_packet;
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- uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
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-
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- if (batadv_skb_head_push(skb, hdr_size) < 0)
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- return false;
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-
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- unicast_packet = (struct batadv_unicast_packet *)skb->data;
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- unicast_packet->header.version = BATADV_COMPAT_VERSION;
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- /* batman packet type: unicast */
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- unicast_packet->header.packet_type = BATADV_UNICAST;
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- /* set unicast ttl */
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- unicast_packet->header.ttl = BATADV_TTL;
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- /* copy the destination for faster routing */
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- memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
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- /* set the destination tt version number */
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- unicast_packet->ttvn = ttvn;
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-
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- return true;
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-}
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-
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-/**
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- * batadv_unicast_prepare_skb - encapsulate an skb with a unicast header
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- * @skb: the skb containing the payload to encapsulate
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- * @orig_node: the destination node
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- *
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- * Returns false if the payload could not be encapsulated or true otherwise.
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- *
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- * This call might reallocate skb data.
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- */
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-static bool batadv_unicast_prepare_skb(struct sk_buff *skb,
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- struct batadv_orig_node *orig_node)
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-{
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- size_t uni_size = sizeof(struct batadv_unicast_packet);
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- return batadv_unicast_push_and_fill_skb(skb, uni_size, orig_node);
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-}
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-
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-/**
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- * batadv_unicast_4addr_prepare_skb - encapsulate an skb with a unicast4addr
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- * header
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- * @bat_priv: the bat priv with all the soft interface information
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- * @skb: the skb containing the payload to encapsulate
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- * @orig_node: the destination node
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- * @packet_subtype: the batman 4addr packet subtype to use
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- *
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- * Returns false if the payload could not be encapsulated or true otherwise.
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- *
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- * This call might reallocate skb data.
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- */
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-bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
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- struct sk_buff *skb,
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- struct batadv_orig_node *orig,
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- int packet_subtype)
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-{
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- struct batadv_hard_iface *primary_if;
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- struct batadv_unicast_4addr_packet *unicast_4addr_packet;
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- bool ret = false;
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-
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- primary_if = batadv_primary_if_get_selected(bat_priv);
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- if (!primary_if)
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- goto out;
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-
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- /* pull the header space and fill the unicast_packet substructure.
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- * We can do that because the first member of the unicast_4addr_packet
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- * is of type struct unicast_packet
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- */
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- if (!batadv_unicast_push_and_fill_skb(skb,
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- sizeof(*unicast_4addr_packet),
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- orig))
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- goto out;
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-
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- unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
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- unicast_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR;
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- memcpy(unicast_4addr_packet->src, primary_if->net_dev->dev_addr,
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- ETH_ALEN);
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- unicast_4addr_packet->subtype = packet_subtype;
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- unicast_4addr_packet->reserved = 0;
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-
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- ret = true;
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-out:
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- if (primary_if)
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- batadv_hardif_free_ref(primary_if);
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|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * batadv_unicast_generic_send_skb - send an skb as unicast
|
|
|
- * @bat_priv: the bat priv with all the soft interface information
|
|
|
- * @skb: payload to send
|
|
|
- * @packet_type: the batman unicast packet type to use
|
|
|
- * @packet_subtype: the batman packet subtype. It is ignored if packet_type is
|
|
|
- * not BATADV_UNICAT_4ADDR
|
|
|
- *
|
|
|
- * Returns 1 in case of error or 0 otherwise
|
|
|
- */
|
|
|
-int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
|
|
|
- struct sk_buff *skb, int packet_type,
|
|
|
- int packet_subtype)
|
|
|
-{
|
|
|
- struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
|
|
|
- struct batadv_unicast_packet *unicast_packet;
|
|
|
- struct batadv_orig_node *orig_node;
|
|
|
- struct batadv_neigh_node *neigh_node;
|
|
|
- int data_len = skb->len;
|
|
|
- int ret = NET_RX_DROP;
|
|
|
- unsigned int dev_mtu, header_len;
|
|
|
-
|
|
|
- /* get routing information */
|
|
|
- if (is_multicast_ether_addr(ethhdr->h_dest)) {
|
|
|
- orig_node = batadv_gw_get_selected_orig(bat_priv);
|
|
|
- if (orig_node)
|
|
|
- goto find_router;
|
|
|
- }
|
|
|
-
|
|
|
- /* check for tt host - increases orig_node refcount.
|
|
|
- * returns NULL in case of AP isolation
|
|
|
- */
|
|
|
- orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
|
|
|
- ethhdr->h_dest);
|
|
|
-
|
|
|
-find_router:
|
|
|
- /* find_router():
|
|
|
- * - if orig_node is NULL it returns NULL
|
|
|
- * - increases neigh_nodes refcount if found.
|
|
|
- */
|
|
|
- neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
|
|
|
-
|
|
|
- if (!neigh_node)
|
|
|
- goto out;
|
|
|
-
|
|
|
- switch (packet_type) {
|
|
|
- case BATADV_UNICAST:
|
|
|
- if (!batadv_unicast_prepare_skb(skb, orig_node))
|
|
|
- goto out;
|
|
|
-
|
|
|
- header_len = sizeof(struct batadv_unicast_packet);
|
|
|
- break;
|
|
|
- case BATADV_UNICAST_4ADDR:
|
|
|
- if (!batadv_unicast_4addr_prepare_skb(bat_priv, skb, orig_node,
|
|
|
- packet_subtype))
|
|
|
- goto out;
|
|
|
-
|
|
|
- header_len = sizeof(struct batadv_unicast_4addr_packet);
|
|
|
- break;
|
|
|
- default:
|
|
|
- /* this function supports UNICAST and UNICAST_4ADDR only. It
|
|
|
- * should never be invoked with any other packet type
|
|
|
- */
|
|
|
- goto out;
|
|
|
- }
|
|
|
-
|
|
|
- ethhdr = (struct ethhdr *)(skb->data + header_len);
|
|
|
- unicast_packet = (struct batadv_unicast_packet *)skb->data;
|
|
|
-
|
|
|
- /* inform the destination node that we are still missing a correct route
|
|
|
- * for this client. The destination will receive this packet and will
|
|
|
- * try to reroute it because the ttvn contained in the header is less
|
|
|
- * than the current one
|
|
|
- */
|
|
|
- if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
|
|
|
- unicast_packet->ttvn = unicast_packet->ttvn - 1;
|
|
|
-
|
|
|
- dev_mtu = neigh_node->if_incoming->net_dev->mtu;
|
|
|
- /* fragmentation mechanism only works for UNICAST (now) */
|
|
|
- if (packet_type == BATADV_UNICAST &&
|
|
|
- atomic_read(&bat_priv->fragmentation) &&
|
|
|
- data_len + sizeof(*unicast_packet) > dev_mtu) {
|
|
|
- /* send frag skb decreases ttl */
|
|
|
- unicast_packet->header.ttl++;
|
|
|
- ret = batadv_frag_send_skb(skb, bat_priv,
|
|
|
- neigh_node->if_incoming,
|
|
|
- neigh_node->addr);
|
|
|
- goto out;
|
|
|
- }
|
|
|
-
|
|
|
- if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
|
|
|
- ret = 0;
|
|
|
-
|
|
|
-out:
|
|
|
- if (neigh_node)
|
|
|
- batadv_neigh_node_free_ref(neigh_node);
|
|
|
- if (orig_node)
|
|
|
- batadv_orig_node_free_ref(orig_node);
|
|
|
- if (ret == NET_RX_DROP)
|
|
|
- kfree_skb(skb);
|
|
|
- return ret;
|
|
|
-}
|
Martin Hundebøll