cregit-Linux how code gets into the kernel

Release 4.8 net/batman-adv/routing.c

Directory: net/batman-adv
/* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "routing.h"
#include "main.h"

#include <linux/atomic.h>
#include <linux/byteorder/generic.h>
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/jiffies.h>
#include <linux/kref.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>

#include "bitarray.h"
#include "bridge_loop_avoidance.h"
#include "distributed-arp-table.h"
#include "fragmentation.h"
#include "hard-interface.h"
#include "icmp_socket.h"
#include "log.h"
#include "network-coding.h"
#include "originator.h"
#include "packet.h"
#include "send.h"
#include "soft-interface.h"
#include "tp_meter.h"
#include "translation-table.h"
#include "tvlv.h"

static int batadv_route_unicast_packet(struct sk_buff *skb,
				       struct batadv_hard_iface *recv_if);

/**
 * _batadv_update_route - set the router for this originator
 * @bat_priv: the bat priv with all the soft 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
 *
 * This function does not perform any error checks
 */

static void _batadv_update_route(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_hard_iface *recv_if, struct batadv_neigh_node *neigh_node) { struct batadv_orig_ifinfo *orig_ifinfo; struct batadv_neigh_node *curr_router; orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); if (!orig_ifinfo) return; rcu_read_lock(); curr_router = rcu_dereference(orig_ifinfo->router); if (curr_router && !kref_get_unless_zero(&curr_router->refcount)) curr_router = NULL; rcu_read_unlock(); /* route deleted */ if ((curr_router) && (!neigh_node)) { batadv_dbg(BATADV_DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", orig_node->orig); batadv_tt_global_del_orig(bat_priv, orig_node, -1, "Deleted route towards originator"); /* route added */ } else if ((!curr_router) && (neigh_node)) { batadv_dbg(BATADV_DBG_ROUTES, bat_priv, "Adding route towards: %pM (via %pM)\n", orig_node->orig, neigh_node->addr); /* route changed */ } else if (neigh_node && curr_router) { batadv_dbg(BATADV_DBG_ROUTES, bat_priv, "Changing route towards: %pM (now via %pM - was via %pM)\n", orig_node->orig, neigh_node->addr, curr_router->addr); } if (curr_router) batadv_neigh_node_put(curr_router); spin_lock_bh(&orig_node->neigh_list_lock); /* curr_router used earlier may not be the current orig_ifinfo->router * anymore because it was dereferenced outside of the neigh_list_lock * protected region. After the new best neighbor has replace the current * best neighbor the reference counter needs to decrease. Consequently, * the code needs to ensure the curr_router variable contains a pointer * to the replaced best neighbor. */ curr_router = rcu_dereference_protected(orig_ifinfo->router, true); /* increase refcount of new best neighbor */ if (neigh_node) kref_get(&neigh_node->refcount); rcu_assign_pointer(orig_ifinfo->router, neigh_node); spin_unlock_bh(&orig_node->neigh_list_lock); batadv_orig_ifinfo_put(orig_ifinfo); /* decrease refcount of previous best neighbor */ if (curr_router) batadv_neigh_node_put(curr_router); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann15057.92%1372.22%
simon wunderlichsimon wunderlich5621.62%15.56%
linus lussinglinus lussing3513.51%15.56%
marek lindnermarek lindner145.41%15.56%
antonio quartulliantonio quartulli41.54%211.11%
Total259100.00%18100.00%

/** * batadv_update_route - set the router for this originator * @bat_priv: the bat priv with all the soft 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 */
void batadv_update_route(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_hard_iface *recv_if, struct batadv_neigh_node *neigh_node) { struct batadv_neigh_node *router = NULL; if (!orig_node) goto out; router = batadv_orig_router_get(orig_node, recv_if); if (router != neigh_node) _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); out: if (router) batadv_neigh_node_put(router); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann4254.55%571.43%
linus lussinglinus lussing2532.47%114.29%
simon wunderlichsimon wunderlich1012.99%114.29%
Total77100.00%7100.00%

/** * 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 * @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 * @last_reset: jiffies timestamp of the last reset, will be updated when reset * is detected * @protection_started: is set to true if the protection window was started, * doesn't change otherwise. * * Return: * false if the packet is to be accepted. * true if the packet is to be ignored. */
bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, s32 seq_old_max_diff, unsigned long *last_reset, bool *protection_started) { if (seq_num_diff <= -seq_old_max_diff || seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { if (!batadv_has_timed_out(*last_reset, BATADV_RESET_PROTECTION_MS)) return true; *last_reset = jiffies; if (protection_started) *protection_started = true; batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "old packet received, start protection\n"); } return false; }

Contributors

PersonTokensPropCommitsCommitProp
simon wunderlichsimon wunderlich5773.08%233.33%
marek lindnermarek lindner1215.38%116.67%
sven eckelmannsven eckelmann911.54%350.00%
Total78100.00%6100.00%


bool batadv_check_management_packet(struct sk_buff *skb, struct batadv_hard_iface *hard_iface, int header_len) { struct ethhdr *ethhdr; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, header_len))) return false; ethhdr = eth_hdr(skb); /* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) return false; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) return false; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, 0) < 0) return false; /* keep skb linear */ if (skb_linearize(skb) < 0) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
simon wunderlichsimon wunderlich5249.52%110.00%
marek lindnermarek lindner3230.48%770.00%
sven eckelmannsven eckelmann1817.14%110.00%
antonio quartulliantonio quartulli32.86%110.00%
Total105100.00%10100.00%

/** * batadv_recv_my_icmp_packet - receive an icmp packet locally * @bat_priv: the bat priv with all the soft interface information * @skb: icmp packet to process * * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP * otherwise. */
static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, struct sk_buff *skb) { struct batadv_hard_iface *primary_if = NULL; struct batadv_orig_node *orig_node = NULL; struct batadv_icmp_header *icmph; int res, ret = NET_RX_DROP; 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); if (!primary_if) goto out; /* get routing information */ orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); if (!orig_node) goto out; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, ETH_HLEN) < 0) goto out; icmph = (struct batadv_icmp_header *)skb->data; ether_addr_copy(icmph->dst, icmph->orig); ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); icmph->msg_type = BATADV_ECHO_REPLY; icmph->ttl = BATADV_TTL; res = batadv_send_skb_to_orig(skb, orig_node, NULL); if (res == -1) goto out; ret = NET_RX_SUCCESS; break; case BATADV_TP: if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet))) goto out; batadv_tp_meter_recv(bat_priv, skb); ret = NET_RX_SUCCESS; goto out; default: /* drop unknown type */ goto out; } out: if (primary_if) batadv_hardif_put(primary_if); if (orig_node) batadv_orig_node_put(orig_node); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann11842.14%1050.00%
simon wunderlichsimon wunderlich5820.71%15.00%
antonio quartulliantonio quartulli5017.86%525.00%
marek lindnermarek lindner4917.50%210.00%
martin hundebollmartin hundeboll41.43%15.00%
linus lussinglinus lussing10.36%15.00%
Total280100.00%20100.00%


static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, struct sk_buff *skb) { struct batadv_hard_iface *primary_if = NULL; struct batadv_orig_node *orig_node = NULL; struct batadv_icmp_packet *icmp_packet; int res, ret = NET_RX_DROP; icmp_packet = (struct batadv_icmp_packet *)skb->data; /* send TTL exceeded if packet is an echo request (traceroute) */ if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", icmp_packet->orig, icmp_packet->dst); goto out; } primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; /* get routing information */ orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); if (!orig_node) goto out; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, ETH_HLEN) < 0) goto out; icmp_packet = (struct batadv_icmp_packet *)skb->data; ether_addr_copy(icmp_packet->dst, icmp_packet->orig); ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); icmp_packet->msg_type = BATADV_TTL_EXCEEDED; icmp_packet->ttl = BATADV_TTL; res = batadv_send_skb_to_orig(skb, orig_node, NULL); if (res != -1) ret = NET_RX_SUCCESS; out: if (primary_if) batadv_hardif_put(primary_if); if (orig_node) batadv_orig_node_put(orig_node); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann15168.02%1157.89%
marek lindnermarek lindner5223.42%210.53%
antonio quartulliantonio quartulli135.86%315.79%
martin hundebollmartin hundeboll52.25%210.53%
linus lussinglinus lussing10.45%15.26%
Total222100.00%19100.00%


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_icmp_header *icmph; struct batadv_icmp_packet_rr *icmp_packet_rr; struct ethhdr *ethhdr; struct batadv_orig_node *orig_node = NULL; int hdr_size = sizeof(struct batadv_icmp_header); int res, ret = NET_RX_DROP; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) goto out; ethhdr = eth_hdr(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) goto out; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) goto out; /* not for me */ if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) goto out; icmph = (struct batadv_icmp_header *)skb->data; /* add record route information if not full */ if ((icmph->msg_type == BATADV_ECHO_REPLY || icmph->msg_type == BATADV_ECHO_REQUEST) && (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { if (skb_linearize(skb) < 0) goto out; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, ETH_HLEN) < 0) goto out; ethhdr = eth_hdr(skb); icmph = (struct batadv_icmp_header *)skb->data; icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) goto out; ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], ethhdr->h_dest); icmp_packet_rr->rr_cur++; } /* packet for me */ if (batadv_is_my_mac(bat_priv, icmph->dst)) return batadv_recv_my_icmp_packet(bat_priv, skb); /* TTL exceeded */ if (icmph->ttl < 2) return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); /* get routing information */ orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); if (!orig_node) goto out; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, ETH_HLEN) < 0) goto out; icmph = (struct batadv_icmp_header *)skb->data; /* decrement ttl */ icmph->ttl--; /* route it */ res = batadv_send_skb_to_orig(skb, orig_node, recv_if); if (res != -1) ret = NET_RX_SUCCESS; out: if (orig_node) batadv_orig_node_put(orig_node); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann18748.57%1047.62%
simon wunderlichsimon wunderlich13434.81%314.29%
antonio quartulliantonio quartulli246.23%628.57%
linus lussinglinus lussing205.19%14.76%
marek lindnermarek lindner205.19%14.76%
Total385100.00%21100.00%

/** * batadv_check_unicast_packet - Check for malformed unicast packets * @bat_priv: the bat priv with all the soft interface information * @skb: packet to check * @hdr_size: size of header to pull * * Check for short header and bad addresses in 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 * destination or source, and -EREMOTE for non-local (other host) destination. */
static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) { struct ethhdr *ethhdr; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) return -ENODATA; ethhdr = eth_hdr(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) return -EBADR; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) return -EBADR; /* not for me */ if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) return -EREMOTE; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
martin hundebollmartin hundeboll8991.75%250.00%
antonio quartulliantonio quartulli88.25%250.00%
Total97100.00%4100.00%

/** * batadv_last_bonding_get - Get last_bonding_candidate of orig_node * @orig_node: originator node whose last bonding candidate should be retrieved * * Return: last bonding candidate of router or NULL if not found * * The object is returned with refcounter increased by 1. */
static struct batadv_orig_ifinfo * batadv_last_bonding_get(struct batadv_orig_node *orig_node) { struct batadv_orig_ifinfo *last_bonding_candidate; spin_lock_bh(&orig_node->neigh_list_lock); last_bonding_candidate = orig_node->last_bonding_candidate; if (last_bonding_candidate) kref_get(&last_bonding_candidate->refcount); spin_unlock_bh(&orig_node->neigh_list_lock); return last_bonding_candidate; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann55100.00%1100.00%
Total55100.00%1100.00%

/** * batadv_last_bonding_replace - Replace last_bonding_candidate of orig_node * @orig_node: originator node whose bonding candidates should be replaced * @new_candidate: new bonding candidate or NULL */
static void batadv_last_bonding_replace(struct batadv_orig_node *orig_node, struct batadv_orig_ifinfo *new_candidate) { struct batadv_orig_ifinfo *old_candidate; spin_lock_bh(&orig_node->neigh_list_lock); old_candidate = orig_node->last_bonding_candidate; if (new_candidate) kref_get(&new_candidate->refcount); orig_node->last_bonding_candidate = new_candidate; spin_unlock_bh(&orig_node->neigh_list_lock); if (old_candidate) batadv_orig_ifinfo_put(old_candidate); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann70100.00%1100.00%
Total70100.00%1100.00%

/** * batadv_find_router - find a suitable router for this originator * @bat_priv: the bat priv with all the soft interface information * @orig_node: the destination node * @recv_if: pointer to interface this packet was received on * * Return: the router which should be used for this orig_node on * this interface, or NULL if not available. */
struct batadv_neigh_node * batadv_find_router(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_hard_iface *recv_if) { struct batadv_algo_ops *bao = bat_priv->algo_ops; struct batadv_neigh_node *first_candidate_router = NULL; struct batadv_neigh_node *next_candidate_router = NULL; struct batadv_neigh_node *router, *cand_router = NULL; struct batadv_neigh_node *last_cand_router = NULL; struct batadv_orig_ifinfo *cand, *first_candidate = NULL; struct batadv_orig_ifinfo *next_candidate = NULL; struct batadv_orig_ifinfo *last_candidate; bool last_candidate_found = false; if (!orig_node) return NULL; router = batadv_orig_router_get(orig_node, recv_if); if (!router) return router; /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) * and if activated. */ if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) return router; /* bonding: loop through the list of possible routers found * for the various outgoing interfaces and find a candidate after * the last chosen bonding candidate (next_candidate). If no such * router is found, use the first candidate found (the previously * chosen bonding candidate might have been the last one in the list). * If this can't be found either, return the previously chosen * router - obviously there are no other candidates. */ rcu_read_lock(); last_candidate = batadv_last_bonding_get(orig_node); if (last_candidate) last_cand_router = rcu_dereference(last_candidate->router); hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { /* acquire some structures and references ... */ if (!kref_get_unless_zero(&cand->refcount)) continue; cand_router = rcu_dereference(cand->router); if (!cand_router) goto next; if (!kref_get_unless_zero(&cand_router->refcount)) { cand_router = NULL; goto next; } /* alternative candidate should be good enough to be * considered */ if (!bao->neigh.is_similar_or_better(cand_router, cand->if_outgoing, router, recv_if)) goto next; /* don't use the same router twice */ if (last_cand_router == cand_router) goto next; /* mark the first possible candidate */ if (!first_candidate) { kref_get(&cand_router->refcount); kref_get(&cand->refcount); first_candidate = cand; first_candidate_router = cand_router; } /* check if the loop has already passed the previously selected * candidate ... this function should select the next candidate * AFTER the previously used bonding candidate. */ if (!last_candidate || last_candidate_found) { next_candidate = cand; next_candidate_router = cand_router; break; } if (last_candidate == cand) last_candidate_found = true; next: /* free references */ if (cand_router) { batadv_neigh_node_put(cand_router); cand_router = NULL; } batadv_orig_ifinfo_put(cand); } rcu_read_unlock(); /* After finding candidates, handle the three cases: * 1) there is a next candidate, use that * 2) there is no next candidate, use the first of the list * 3) there is no candidate at all, return the default router */ if (next_candidate) { batadv_neigh_node_put(router); kref_get(&next_candidate_router->refcount); router = next_candidate_router; batadv_last_bonding_replace(orig_node, next_candidate); } else if (first_candidate) { batadv_neigh_node_put(router); kref_get(&first_candidate_router->refcount); router = first_candidate_router; batadv_last_bonding_replace(orig_node, first_candidate); } else { batadv_last_bonding_replace(orig_node, NULL); } /* cleanup of candidates */ if (first_candidate) { batadv_neigh_node_put(first_candidate_router); batadv_orig_ifinfo_put(first_candidate); } if (next_candidate) { batadv_neigh_node_put(next_candidate_router); batadv_orig_ifinfo_put(next_candidate); } if (last_candidate) batadv_orig_ifinfo_put(last_candidate); return router; }

Contributors

PersonTokensPropCommitsCommitProp
simon wunderlichsimon wunderlich33072.21%318.75%
sven eckelmannsven eckelmann10623.19%956.25%
antonio quartulliantonio quartulli153.28%318.75%
linus lussinglinus lussing61.31%16.25%
Total457100.00%16100.00%


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_orig_node *orig_node = NULL; struct batadv_unicast_packet *unicast_packet; struct ethhdr *ethhdr = eth_hdr(skb); int res, hdr_len, ret = NET_RX_DROP; unsigned int len; unicast_packet = (struct batadv_unicast_packet *)skb->data; /* TTL exceeded */ if (unicast_packet->ttl < 2) { pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", ethhdr->h_source, unicast_packet->dest); goto out; } /* get routing information */ orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); if (!orig_node) goto out; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, ETH_HLEN) < 0) goto out; /* decrement ttl */ unicast_packet = (struct batadv_unicast_packet *)skb->data; unicast_packet->ttl--; switch (unicast_packet->packet_type) { case BATADV_UNICAST_4ADDR: hdr_len = sizeof(struct batadv_unicast_4addr_packet); break; case BATADV_UNICAST: hdr_len = sizeof(struct batadv_unicast_packet); break; default: /* other packet types not supported - yet */ hdr_len = -1; break; } if (hdr_len > 0) batadv_skb_set_priority(skb, hdr_len); len = skb->len; res = batadv_send_skb_to_orig(skb, orig_node, recv_if); if (res == -1) goto out; /* translate transmit result into receive result */ if (res == NET_XMIT_SUCCESS) { /* skb was transmitted and consumed */ batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, len + ETH_HLEN); } ret = NET_RX_SUCCESS; out: if (orig_node) batadv_orig_node_put(orig_node); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann12745.52%840.00%
simon wunderlichsimon wunderlich5620.07%210.00%
martin hundebollmartin hundeboll4415.77%420.00%
marek lindnermarek lindner2910.39%15.00%
antonio quartulliantonio quartulli134.66%420.00%
florian westphalflorian westphal103.58%15.00%
Total279100.00%20100.00%

/** * batadv_reroute_unicast_packet - update the unicast header for re-routing * @bat_priv: the bat priv with all the soft interface information * @unicast_packet: the unicast header to be updated * @dst_addr: the payload destination * @vid: VLAN identifier * * Search the translation table for dst_addr and update the unicast header with * the new corresponding information (originator address where the destination * client currently is and its known TTVN) * * Return: true if the packet header has been updated, false otherwise */
static bool batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct batadv_unicast_packet *unicast_packet, u8 *dst_addr, unsigned short vid) { struct batadv_orig_node *orig_node = NULL; struct batadv_hard_iface *primary_if = NULL; bool ret = false; u8 *orig_addr, orig_ttvn; if (batadv_is_my_client(bat_priv, dst_addr, vid)) { primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; orig_addr = primary_if->net_dev->dev_addr; orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); } else { orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, vid); if (!orig_node) goto out; if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) goto out; orig_addr = orig_node->orig; orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); } /* update the packet header */ ether_addr_copy(unicast_packet->dest, orig_addr); unicast_packet->ttvn = orig_ttvn; ret = true; out: if (primary_if) batadv_hardif_put(primary_if); if (orig_node) batadv_orig_node_put(orig_node); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
antonio quartulliantonio quartulli19697.03%350.00%
sven eckelmannsven eckelmann62.97%350.00%
Total202100.00%6100.00%


static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_len) { struct batadv_unicast_packet *unicast_packet; struct batadv_hard_iface *primary_if; struct batadv_orig_node *orig_node; u8 curr_ttvn, old_ttvn; struct ethhdr *ethhdr; unsigned short vid; int is_old_ttvn; /* check if there is enough data before accessing it */ if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) return false; /* create a copy of the skb (in case of for re-routing) to modify it. */ if (skb_cow(skb, sizeof(*unicast_packet)) < 0) return false; unicast_packet = (struct batadv_unicast_packet *)skb->data; vid = batadv_get_vid(skb, hdr_len); ethhdr = (struct ethhdr *)(skb->data + hdr_len); /* 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 * the packet to */ if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, ethhdr->h_dest, vid)) batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", unicast_packet->dest, ethhdr->h_dest); /* at this point the mesh destination should have been * substituted with the originator address found in the global * table. If not, let the packet go untouched anyway because * there is nothing the node can do */ return true; } /* retrieve the TTVN known by this node for the packet destination. This * value is used later to check if the node which sent (or re-routed * last time) the packet had an updated information or not */ curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { orig_node =