cregit-Linux how code gets into the kernel

Release 4.8 net/batman-adv/gateway_client.c

Directory: net/batman-adv
/* Copyright (C) 2009-2016  B.A.T.M.A.N. contributors:
 *
 * Marek Lindner
 *
 * 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 "gateway_client.h"
#include "main.h"

#include <linux/atomic.h>
#include <linux/byteorder/generic.h>
#include <linux/etherdevice.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/udp.h>

#include "gateway_common.h"
#include "hard-interface.h"
#include "log.h"
#include "originator.h"
#include "packet.h"
#include "routing.h"
#include "sysfs.h"
#include "translation-table.h"

/* These are the offsets of the "hw type" and "hw address length" in the dhcp
 * packet starting at the beginning of the dhcp header
 */

#define BATADV_DHCP_HTYPE_OFFSET	1

#define BATADV_DHCP_HLEN_OFFSET		2
/* Value of htype representing Ethernet */

#define BATADV_DHCP_HTYPE_ETHERNET	0x01
/* This is the offset of the "chaddr" field in the dhcp packet starting at the
 * beginning of the dhcp header
 */

#define BATADV_DHCP_CHADDR_OFFSET	28

/**
 * batadv_gw_node_release - release gw_node from lists and queue for free after
 *  rcu grace period
 * @ref: kref pointer of the gw_node
 */

static void batadv_gw_node_release(struct kref *ref) { struct batadv_gw_node *gw_node; gw_node = container_of(ref, struct batadv_gw_node, refcount); batadv_orig_node_put(gw_node->orig_node); kfree_rcu(gw_node, rcu); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann3173.81%350.00%
antonio quartulliantonio quartulli614.29%116.67%
marek lindnermarek lindner37.14%116.67%
paul e. mckenneypaul e. mckenney24.76%116.67%
Total42100.00%6100.00%

/** * batadv_gw_node_put - decrement the gw_node refcounter and possibly release it * @gw_node: gateway node to free */
static void batadv_gw_node_put(struct batadv_gw_node *gw_node) { kref_put(&gw_node->refcount, batadv_gw_node_release); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann2095.24%266.67%
antonio quartulliantonio quartulli14.76%133.33%
Total21100.00%3100.00%


static struct batadv_gw_node * batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) { struct batadv_gw_node *gw_node; rcu_read_lock(); gw_node = rcu_dereference(bat_priv->gw.curr_gw); if (!gw_node) goto out; if (!kref_get_unless_zero(&gw_node->refcount)) gw_node = NULL; out: rcu_read_unlock(); return gw_node; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann2438.10%550.00%
linus lussinglinus lussing2336.51%330.00%
marek lindnermarek lindner1625.40%220.00%
Total63100.00%10100.00%


struct batadv_orig_node * batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) { struct batadv_gw_node *gw_node; struct batadv_orig_node *orig_node = NULL; gw_node = batadv_gw_get_selected_gw_node(bat_priv); if (!gw_node) goto out; rcu_read_lock(); orig_node = gw_node->orig_node; if (!orig_node) goto unlock; if (!kref_get_unless_zero(&orig_node->refcount)) orig_node = NULL; unlock: rcu_read_unlock(); out: if (gw_node) batadv_gw_node_put(gw_node); return orig_node; }

Contributors

PersonTokensPropCommitsCommitProp
marek lindnermarek lindner4954.44%112.50%
sven eckelmannsven eckelmann3033.33%675.00%
linus lussinglinus lussing1112.22%112.50%
Total90100.00%8100.00%


static void batadv_gw_select(struct batadv_priv *bat_priv, struct batadv_gw_node *new_gw_node) { struct batadv_gw_node *curr_gw_node; spin_lock_bh(&bat_priv->gw.list_lock); if (new_gw_node) kref_get(&new_gw_node->refcount); curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); if (curr_gw_node) batadv_gw_node_put(curr_gw_node); spin_unlock_bh(&bat_priv->gw.list_lock); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann5058.14%770.00%
linus lussinglinus lussing1922.09%110.00%
marek lindnermarek lindner1719.77%220.00%
Total86100.00%10100.00%

/** * batadv_gw_reselect - force a gateway reselection * @bat_priv: the bat priv with all the soft interface information * * Set a flag to remind the GW component to perform a new gateway reselection. * However this function does not ensure that the current gateway is going to be * deselected. The reselection mechanism may elect the same gateway once again. * * This means that invoking batadv_gw_reselect() does not guarantee a gateway * change and therefore a uevent is not necessarily expected. */
void batadv_gw_reselect(struct batadv_priv *bat_priv) { atomic_set(&bat_priv->gw.reselect, 1); }

Contributors

PersonTokensPropCommitsCommitProp
marek lindnermarek lindner1254.55%228.57%
antonio quartulliantonio quartulli522.73%228.57%
sven eckelmannsven eckelmann522.73%342.86%
Total22100.00%7100.00%


static struct batadv_gw_node * batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) { struct batadv_neigh_node *router; struct batadv_neigh_ifinfo *router_ifinfo; struct batadv_gw_node *gw_node, *curr_gw = NULL; u64 max_gw_factor = 0; u64 tmp_gw_factor = 0; u8 max_tq = 0; u8 tq_avg; struct batadv_orig_node *orig_node; rcu_read_lock(); hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { orig_node = gw_node->orig_node; router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); if (!router) continue; router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); if (!router_ifinfo) goto next; if (!kref_get_unless_zero(&gw_node->refcount)) goto next; tq_avg = router_ifinfo->bat_iv.tq_avg; switch (atomic_read(&bat_priv->gw.sel_class)) { case 1: /* fast connection */ tmp_gw_factor = tq_avg * tq_avg; tmp_gw_factor *= gw_node->bandwidth_down; tmp_gw_factor *= 100 * 100; tmp_gw_factor >>= 18; if ((tmp_gw_factor > max_gw_factor) || ((tmp_gw_factor == max_gw_factor) && (tq_avg > max_tq))) { if (curr_gw) batadv_gw_node_put(curr_gw); curr_gw = gw_node; kref_get(&curr_gw->refcount); } break; default: /* 2: stable connection (use best statistic) * 3: fast-switch (use best statistic but change as * soon as a better gateway appears) * XX: late-switch (use best statistic but change as * soon as a better gateway appears which has * $routing_class more tq points) */ if (tq_avg > max_tq) { if (curr_gw) batadv_gw_node_put(curr_gw); curr_gw = gw_node; kref_get(&curr_gw->refcount); } break; } if (tq_avg > max_tq) max_tq = tq_avg; if (tmp_gw_factor > max_gw_factor) max_gw_factor = tmp_gw_factor; batadv_gw_node_put(gw_node); next: batadv_neigh_node_put(router); if (router_ifinfo) batadv_neigh_ifinfo_put(router_ifinfo); } rcu_read_unlock(); return curr_gw; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann15552.72%1460.87%
antonio quartulliantonio quartulli7826.53%313.04%
simon wunderlichsimon wunderlich3411.56%28.70%
linus lussinglinus lussing155.10%28.70%
marek lindnermarek lindner124.08%28.70%
Total294100.00%23100.00%

/** * batadv_gw_check_client_stop - check if client mode has been switched off * @bat_priv: the bat priv with all the soft interface information * * This function assumes the caller has checked that the gw state *is actually * changing*. This function is not supposed to be called when there is no state * change. */
void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) { struct batadv_gw_node *curr_gw; if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) return; curr_gw = batadv_gw_get_selected_gw_node(bat_priv); if (!curr_gw) return; /* deselect the current gateway so that next time that client mode is * enabled a proper GW_ADD event can be sent */ batadv_gw_select(bat_priv, NULL); /* if batman-adv is switching the gw client mode off and a gateway was * already selected, send a DEL uevent */ batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); batadv_gw_node_put(curr_gw); }

Contributors

PersonTokensPropCommitsCommitProp
antonio quartulliantonio quartulli6798.53%375.00%
sven eckelmannsven eckelmann11.47%125.00%
Total68100.00%4100.00%


void batadv_gw_election(struct batadv_priv *bat_priv) { struct batadv_gw_node *curr_gw = NULL; struct batadv_gw_node *next_gw = NULL; struct batadv_neigh_node *router = NULL; struct batadv_neigh_ifinfo *router_ifinfo = NULL; char gw_addr[18] = { '\0' }; if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT) goto out; curr_gw = batadv_gw_get_selected_gw_node(bat_priv); if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) goto out; next_gw = batadv_gw_get_best_gw_node(bat_priv); if (curr_gw == next_gw) goto out; if (next_gw) { sprintf(gw_addr, "%pM", next_gw->orig_node->orig); router = batadv_orig_router_get(next_gw->orig_node, BATADV_IF_DEFAULT); if (!router) { batadv_gw_reselect(bat_priv); goto out; } router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); if (!router_ifinfo) { batadv_gw_reselect(bat_priv); goto out; } } if ((curr_gw) && (!next_gw)) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Removing selected gateway - no gateway in range\n"); batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); } else if ((!curr_gw) && (next_gw)) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", next_gw->orig_node->orig, next_gw->bandwidth_down / 10, next_gw->bandwidth_down % 10, next_gw->bandwidth_up / 10, next_gw->bandwidth_up % 10, router_ifinfo->bat_iv.tq_avg); batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, gw_addr); } else { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", next_gw->orig_node->orig, next_gw->bandwidth_down / 10, next_gw->bandwidth_down % 10, next_gw->bandwidth_up / 10, next_gw->bandwidth_up % 10, router_ifinfo->bat_iv.tq_avg); batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, gw_addr); } batadv_gw_select(bat_priv, next_gw); out: if (curr_gw) batadv_gw_node_put(curr_gw); if (next_gw) batadv_gw_node_put(next_gw); if (router) batadv_neigh_node_put(router); if (router_ifinfo) batadv_neigh_ifinfo_put(router_ifinfo); }

Contributors

PersonTokensPropCommitsCommitProp
antonio quartulliantonio quartulli15741.10%520.00%
sven eckelmannsven eckelmann10627.75%1456.00%
marek lindnermarek lindner6115.97%312.00%
simon wunderlichsimon wunderlich4411.52%28.00%
linus lussinglinus lussing143.66%14.00%
Total382100.00%25100.00%


void batadv_gw_check_election(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node) { struct batadv_neigh_ifinfo *router_orig_tq = NULL; struct batadv_neigh_ifinfo *router_gw_tq = NULL; struct batadv_orig_node *curr_gw_orig; struct batadv_neigh_node *router_gw = NULL; struct batadv_neigh_node *router_orig = NULL; u8 gw_tq_avg, orig_tq_avg; curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); if (!curr_gw_orig) goto reselect; router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); if (!router_gw) goto reselect; router_gw_tq = batadv_neigh_ifinfo_get(router_gw, BATADV_IF_DEFAULT); if (!router_gw_tq) goto reselect; /* this node already is the gateway */ if (curr_gw_orig == orig_node) goto out; router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); if (!router_orig) goto out; router_orig_tq = batadv_neigh_ifinfo_get(router_orig, BATADV_IF_DEFAULT); if (!router_orig_tq) goto out; gw_tq_avg = router_gw_tq->bat_iv.tq_avg; orig_tq_avg = router_orig_tq->bat_iv.tq_avg; /* the TQ value has to be better */ if (orig_tq_avg < gw_tq_avg) goto out; /* if the routing class is greater than 3 the value tells us how much * greater the TQ value of the new gateway must be */ if ((atomic_read(&bat_priv->gw.sel_class) > 3) && (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class))) goto out; batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", gw_tq_avg, orig_tq_avg); reselect: batadv_gw_reselect(bat_priv); out: if (curr_gw_orig) batadv_orig_node_put(curr_gw_orig); if (router_gw) batadv_neigh_node_put(router_gw); if (router_orig) batadv_neigh_node_put(router_orig); if (router_gw_tq) batadv_neigh_ifinfo_put(router_gw_tq); if (router_orig_tq) batadv_neigh_ifinfo_put(router_orig_tq); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann12043.64%1260.00%
simon wunderlichsimon wunderlich7226.18%210.00%
linus lussinglinus lussing6925.09%315.00%
antonio quartulliantonio quartulli145.09%315.00%
Total275100.00%20100.00%

/** * batadv_gw_node_add - add gateway node to list of available gateways * @bat_priv: the bat priv with all the soft interface information * @orig_node: originator announcing gateway capabilities * @gateway: announced bandwidth information */
static void batadv_gw_node_add(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_tvlv_gateway_data *gateway) { struct batadv_gw_node *gw_node; if (gateway->bandwidth_down == 0) return; gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); if (!gw_node) return; kref_get(&orig_node->refcount); INIT_HLIST_NODE(&gw_node->list); gw_node->orig_node = orig_node; gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); kref_init(&gw_node->refcount); spin_lock_bh(&bat_priv->gw.list_lock); hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); spin_unlock_bh(&bat_priv->gw.list_lock); batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", orig_node->orig, ntohl(gateway->bandwidth_down) / 10, ntohl(gateway->bandwidth_down) % 10, ntohl(gateway->bandwidth_up) / 10, ntohl(gateway->bandwidth_up) % 10); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann11761.58%1076.92%
marek lindnermarek lindner4724.74%17.69%
simon wunderlichsimon wunderlich2211.58%17.69%
antonio quartulliantonio quartulli42.11%17.69%
Total190100.00%13100.00%

/** * batadv_gw_node_get - retrieve gateway node from list of available gateways * @bat_priv: the bat priv with all the soft interface information * @orig_node: originator announcing gateway capabilities * * Return: gateway node if found or NULL otherwise. */
static struct batadv_gw_node * batadv_gw_node_get(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node) { struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; rcu_read_lock(); hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { if (gw_node_tmp->orig_node != orig_node) continue; if (!kref_get_unless_zero(&gw_node_tmp->refcount)) continue; gw_node = gw_node_tmp; break; } rcu_read_unlock(); return gw_node; }

Contributors

PersonTokensPropCommitsCommitProp
marek lindnermarek lindner6994.52%133.33%
sven eckelmannsven eckelmann45.48%266.67%
Total73100.00%3100.00%

/** * batadv_gw_node_update - update list of available gateways with changed * bandwidth information * @bat_priv: the bat priv with all the soft interface information * @orig_node: originator announcing gateway capabilities * @gateway: announced bandwidth information */
void batadv_gw_node_update(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_tvlv_gateway_data *gateway) { struct batadv_gw_node *gw_node, *curr_gw = NULL; gw_node = batadv_gw_node_get(bat_priv, orig_node); if (!gw_node) { batadv_gw_node_add(bat_priv, orig_node, gateway); goto out; } if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) goto out; batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", orig_node->orig, gw_node->bandwidth_down / 10, gw_node->bandwidth_down % 10, gw_node->bandwidth_up / 10, gw_node->bandwidth_up % 10, ntohl(gateway->bandwidth_down) / 10, ntohl(gateway->bandwidth_down) % 10, ntohl(gateway->bandwidth_up) / 10, ntohl(gateway->bandwidth_up) % 10); gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); if (ntohl(gateway->bandwidth_down) == 0) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Gateway %pM removed from gateway list\n", orig_node->orig); /* Note: We don't need a NULL check here, since curr_gw never * gets dereferenced. */ spin_lock_bh(&bat_priv->gw.list_lock); if (!hlist_unhashed(&gw_node->list)) { hlist_del_init_rcu(&gw_node->list); batadv_gw_node_put(gw_node); } spin_unlock_bh(&bat_priv->gw.list_lock); curr_gw = batadv_gw_get_selected_gw_node(bat_priv); if (gw_node == curr_gw) batadv_gw_reselect(bat_priv); if (curr_gw) batadv_gw_node_put(curr_gw); } out: if (gw_node) batadv_gw_node_put(gw_node); }

Contributors

PersonTokensPropCommitsCommitProp
marek lindnermarek lindner17258.31%218.18%
sven eckelmannsven eckelmann9130.85%763.64%
simon wunderlichsimon wunderlich3110.51%19.09%
antonio quartulliantonio quartulli10.34%19.09%
Total295100.00%11100.00%


void batadv_gw_node_delete(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node) { struct batadv_tvlv_gateway_data gateway; gateway.bandwidth_down = 0; gateway.bandwidth_up = 0; batadv_gw_node_update(bat_priv, orig_node, &gateway); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann2356.10%480.00%
marek lindnermarek lindner1843.90%120.00%
Total41100.00%5100.00%


void batadv_gw_node_free(struct batadv_priv *bat_priv) { struct batadv_gw_node *gw_node; struct hlist_node *node_tmp; spin_lock_bh(&bat_priv->gw.list_lock); hlist_for_each_entry_safe(gw_node, node_tmp, &bat_priv->gw.list, list) { hlist_del_init_rcu(&gw_node->list); batadv_gw_node_put(gw_node); } spin_unlock_bh(&bat_priv->gw.list_lock); }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann6396.92%480.00%
simon wunderlichsimon wunderlich23.08%120.00%
Total65100.00%5100.00%

/* fails if orig_node has no router */
static int batadv_write_buffer_text(struct batadv_priv *bat_priv, struct seq_file *seq, const struct batadv_gw_node *gw_node) { struct batadv_gw_node *curr_gw; struct batadv_neigh_node *router; struct batadv_neigh_ifinfo *router_ifinfo = NULL; int ret = -1; router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); if (!router) goto out; router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); if (!router_ifinfo) goto out; curr_gw = batadv_gw_get_selected_gw_node(bat_priv); seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", (curr_gw == gw_node ? "=>" : " "), gw_node->orig_node->orig, router_ifinfo->bat_iv.tq_avg, router->addr, router->if_incoming->net_dev->name, gw_node->bandwidth_down / 10, gw_node->bandwidth_down % 10, gw_node->bandwidth_up / 10, gw_node->bandwidth_up % 10); ret = seq_has_overflowed(seq) ? -1 : 0; if (curr_gw) batadv_gw_node_put(curr_gw); out: if (router_ifinfo) batadv_neigh_ifinfo_put(router_ifinfo); if (router) batadv_neigh_node_put(router); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann7538.07%743.75%
simon wunderlichsimon wunderlich4422.34%212.50%
linus lussinglinus lussing4020.30%212.50%
marek lindnermarek lindner2412.18%212.50%
joe perchesjoe perches126.09%212.50%
antonio quartulliantonio quartulli21.02%16.25%
Total197100.00%16100.00%


int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); struct batadv_hard_iface *primary_if; struct batadv_gw_node *gw_node; int gw_count = 0; primary_if = batadv_seq_print_text_primary_if_get(seq); if (!primary_if) goto out; seq_printf(seq, " Gateway (#/255) Nexthop [outgoingIF]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", BATADV_SOURCE_VERSION, primary_if->net_dev->name, primary_if->net_dev->dev_addr, net_dev->name); rcu_read_lock(); hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { /* fails if orig_node has no router */ if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) continue; gw_count++; } rcu_read_unlock(); if (gw_count == 0) seq_puts(seq, "No gateways in range ...\n"); out: if (primary_if) batadv_hardif_put(primary_if); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
sven eckelmannsven eckelmann12480.52%758.33%
marek lindnermarek lindner2314.94%216.67%
linus lussinglinus lussing53.25%18.33%
antonio quartulliantonio quartulli21.30%216.67%
Total154100.00%12100.00%

/** * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message * @skb: the packet to check * @header_len: a pointer to the batman-adv header size * @chaddr: buffer where the client address will be stored. Valid * only if the function returns BATADV_DHCP_TO_CLIENT * * This function may re-allocate the data buffer of the skb passed as argument. * * Return: * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error * while parsing it * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client */
enum batadv_dhcp_recipient batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, u8 *chaddr) { enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; struct ethhdr *ethhdr; struct iphdr *iphdr; struct ipv6hdr *ipv6hdr; struct udphdr *udphdr; struct vlan_ethhdr *vhdr; int chaddr_offset; __be16 proto; u8 *p; /* check for ethernet header */ if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) return BATADV_DHCP_NO; ethhdr = eth_hdr(skb); proto = ethhdr->h_proto; *header_len += ETH_HLEN; /* check for initial vlan header */ if (proto == htons(ETH_P_8021Q)) { if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) return BATADV_DHCP_NO; vhdr = vlan_eth_hdr(skb); proto = vhdr->h_vlan_encapsulated_proto; *header_len += VLAN_HLEN; } /* check for ip header */ switch (proto) { case htons(ETH_P_IP): if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) return BATADV_DHCP_NO; iphdr = (struct iphdr *)(skb->data + *header_len); *header_len += iphdr->ihl * 4; /* check for udp header */ if (iphdr->protocol != IPPROTO_UDP) return BATADV_DHCP_NO; break; case htons(ETH_P_IPV6): if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) return BATADV_DHCP_NO; ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); *header_len += sizeof(*ipv6hdr); /* check for udp header */ if (ipv6hdr->nexthdr != IPPROTO_UDP) return BATADV_DHCP_NO; break; default: return BATADV_DHCP_NO; } if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) return BATADV_DHCP_NO; udphdr = (struct udphdr *)(skb->data + *header_len); *header_len += sizeof(*udphdr); /* check for bootp port */ switch (proto) { case htons(ETH_P_IP): if (udphdr->dest == htons(67)) ret = BATADV_DHCP_TO_SERVER; else if (udphdr->source == htons(67)) ret = BATADV_DHCP_TO_CLIENT; break; case htons(ETH_P_IPV6): if (udphdr->dest == htons