cregit-Linux how code gets into the kernel

Release 4.8 net/tipc/bearer.c

Directory: net/tipc
/*
 * net/tipc/bearer.c: TIPC bearer code
 *
 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <net/sock.h>
#include "core.h"
#include "bearer.h"
#include "link.h"
#include "discover.h"
#include "monitor.h"
#include "bcast.h"
#include "netlink.h"


#define MAX_ADDR_STR 60


static struct tipc_media * const media_info_array[] = {
	&eth_media_info,
#ifdef CONFIG_TIPC_MEDIA_IB
	&ib_media_info,
#endif
#ifdef CONFIG_TIPC_MEDIA_UDP
	&udp_media_info,
#endif
	NULL
};

static void bearer_disable(struct net *net, struct tipc_bearer *b);

/**
 * tipc_media_find - locates specified media object by name
 */

struct tipc_media *tipc_media_find(const char *name) { u32 i; for (i = 0; media_info_array[i] != NULL; i++) { if (!strcmp(media_info_array[i]->name, name)) break; } return media_info_array[i]; }

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per lidenper liden3869.09%116.67%
jon paul maloyjon paul maloy916.36%233.33%
allan stephensallan stephens712.73%233.33%
paul gortmakerpaul gortmaker11.82%116.67%
Total55100.00%6100.00%

/** * media_find_id - locates specified media object by type identifier */
static struct tipc_media *media_find_id(u8 type) { u32 i; for (i = 0; media_info_array[i] != NULL; i++) { if (media_info_array[i]->type_id == type) break; } return media_info_array[i]; }

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allan stephensallan stephens3672.00%233.33%
jon paul maloyjon paul maloy918.00%233.33%
per lidenper liden48.00%116.67%
paul gortmakerpaul gortmaker12.00%116.67%
Total50100.00%6100.00%

/** * tipc_media_addr_printf - record media address in print buffer */
void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) { char addr_str[MAX_ADDR_STR]; struct tipc_media *m; int ret; m = media_find_id(a->media_id); if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); else { u32 i; ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); for (i = 0; i < sizeof(a->value); i++) ret += scnprintf(buf - ret, len + ret, "-%02x", a->value[i]); } }

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PersonTokensPropCommitsCommitProp
per lidenper liden6446.72%220.00%
allan stephensallan stephens3727.01%440.00%
erik hugneerik hugne2719.71%110.00%
jon paul maloyjon paul maloy53.65%110.00%
richard alperichard alpe32.19%110.00%
paul gortmakerpaul gortmaker10.73%110.00%
Total137100.00%10100.00%

/** * bearer_name_validate - validate & (optionally) deconstruct bearer name * @name: ptr to bearer name string * @name_parts: ptr to area for bearer name components (or NULL if not needed) * * Returns 1 if bearer name is valid, otherwise 0. */
static int bearer_name_validate(const char *name, struct tipc_bearer_names *name_parts) { char name_copy[TIPC_MAX_BEARER_NAME]; char *media_name; char *if_name; u32 media_len; u32 if_len; /* copy bearer name & ensure length is OK */ name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; /* need above in case non-Posix strncpy() doesn't pad with nulls */ strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) return 0; /* ensure all component parts of bearer name are present */ media_name = name_copy; if_name = strchr(media_name, ':'); if (if_name == NULL) return 0; *(if_name++) = 0; media_len = if_name - media_name; if_len = strlen(if_name) + 1; /* validate component parts of bearer name */ if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) return 0; /* return bearer name components, if necessary */ if (name_parts) { strcpy(name_parts->media_name, media_name); strcpy(name_parts->if_name, if_name); } return 1; }

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per lidenper liden16997.13%133.33%
allan stephensallan stephens42.30%133.33%
paul gortmakerpaul gortmaker10.57%133.33%
Total174100.00%3100.00%

/** * tipc_bearer_find - locates bearer object with matching bearer name */
struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_bearer *b; u32 i; for (i = 0; i < MAX_BEARERS; i++) { b = rtnl_dereference(tn->bearer_list[i]); if (b && (!strcmp(b->name, name))) return b; } return NULL; }

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per lidenper liden4855.81%112.50%
ying xueying xue2933.72%337.50%
jon paul maloyjon paul maloy55.81%112.50%
allan stephensallan stephens33.49%225.00%
sam ravnborgsam ravnborg11.16%112.50%
Total86100.00%8100.00%

/* tipc_bearer_get_name - get the bearer name from its id. * @net: network namespace * @name: a pointer to the buffer where the name will be stored. * @bearer_id: the id to get the name from. */
int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) { struct tipc_net *tn = tipc_net(net); struct tipc_bearer *b; if (bearer_id >= MAX_BEARERS) return -EINVAL; b = rtnl_dereference(tn->bearer_list[bearer_id]); if (!b) return -EINVAL; strcpy(name, b->name); return 0; }

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Total75100.00%1100.00%


void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_bearer *b; rcu_read_lock(); b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); if (b) tipc_disc_add_dest(b->link_req); rcu_read_unlock(); }

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ying xueying xue4470.97%233.33%
per lidenper liden1320.97%233.33%
jon paul maloyjon paul maloy46.45%116.67%
allan stephensallan stephens11.61%116.67%
Total62100.00%6100.00%


void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_bearer *b; rcu_read_lock(); b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); if (b) tipc_disc_remove_dest(b->link_req); rcu_read_unlock(); }

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ying xueying xue4470.97%233.33%
per lidenper liden1320.97%233.33%
jon paul maloyjon paul maloy46.45%116.67%
allan stephensallan stephens11.61%116.67%
Total62100.00%6100.00%

/** * tipc_enable_bearer - enable bearer with the given name */
static int tipc_enable_bearer(struct net *net, const char *name, u32 disc_domain, u32 priority, struct nlattr *attr[]) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_bearer *b; struct tipc_media *m; struct tipc_bearer_names b_names; struct sk_buff *skb; char addr_string[16]; u32 bearer_id; u32 with_this_prio; u32 i; int res = -EINVAL; if (!tn->own_addr) { pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", name); return -ENOPROTOOPT; } if (!bearer_name_validate(name, &b_names)) { pr_warn("Bearer <%s> rejected, illegal name\n", name); return -EINVAL; } if (tipc_addr_domain_valid(disc_domain) && (disc_domain != tn->own_addr)) { if (tipc_in_scope(disc_domain, tn->own_addr)) { disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; res = 0; /* accept any node in own cluster */ } else if (in_own_cluster_exact(net, disc_domain)) res = 0; /* accept specified node in own cluster */ } if (res) { pr_warn("Bearer <%s> rejected, illegal discovery domain\n", name); return -EINVAL; } if ((priority > TIPC_MAX_LINK_PRI) && (priority != TIPC_MEDIA_LINK_PRI)) { pr_warn("Bearer <%s> rejected, illegal priority\n", name); return -EINVAL; } m = tipc_media_find(b_names.media_name); if (!m) { pr_warn("Bearer <%s> rejected, media <%s> not registered\n", name, b_names.media_name); return -EINVAL; } if (priority == TIPC_MEDIA_LINK_PRI) priority = m->priority; restart: bearer_id = MAX_BEARERS; with_this_prio = 1; for (i = MAX_BEARERS; i-- != 0; ) { b = rtnl_dereference(tn->bearer_list[i]); if (!b) { bearer_id = i; continue; } if (!strcmp(name, b->name)) { pr_warn("Bearer <%s> rejected, already enabled\n", name); return -EINVAL; } if ((b->priority == priority) && (++with_this_prio > 2)) { if (priority-- == 0) { pr_warn("Bearer <%s> rejected, duplicate priority\n", name); return -EINVAL; } pr_warn("Bearer <%s> priority adjustment required %u->%u\n", name, priority + 1, priority); goto restart; } } if (bearer_id >= MAX_BEARERS) { pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", name, MAX_BEARERS); return -EINVAL; } b = kzalloc(sizeof(*b), GFP_ATOMIC); if (!b) return -ENOMEM; strcpy(b->name, name); b->media = m; res = m->enable_media(net, b, attr); if (res) { pr_warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res); return -EINVAL; } b->identity = bearer_id; b->tolerance = m->tolerance; b->window = m->window; b->domain = disc_domain; b->net_plane = bearer_id + 'A'; b->priority = priority; res = tipc_disc_create(net, b, &b->bcast_addr, &skb); if (res) { bearer_disable(net, b); pr_warn("Bearer <%s> rejected, discovery object creation failed\n", name); return -EINVAL; } rcu_assign_pointer(tn->bearer_list[bearer_id], b); if (skb) tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); if (tipc_mon_create(net, bearer_id)) return -ENOMEM; pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", name, tipc_addr_string_fill(addr_string, disc_domain), priority); return res; }

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per lidenper liden30047.39%39.38%
allan stephensallan stephens12319.43%928.12%
ying xueying xue10716.90%928.12%
jon paul maloyjon paul maloy6810.74%39.38%
erik hugneerik hugne253.95%39.38%
paul gortmakerpaul gortmaker60.95%26.25%
ingo molnaringo molnar20.32%13.12%
parthasarathy bhuvaraganparthasarathy bhuvaragan10.16%13.12%
richard alperichard alpe10.16%13.12%
Total633100.00%32100.00%

/** * tipc_reset_bearer - Reset all links established over this bearer */
static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) { pr_info("Resetting bearer <%s>\n", b->name); tipc_node_delete_links(net, b->identity); tipc_disc_reset(net, b); return 0; }

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ying xueying xue1636.36%640.00%
per lidenper liden1022.73%16.67%
allan stephensallan stephens715.91%320.00%
erik hugneerik hugne613.64%320.00%
jon paul maloyjon paul maloy511.36%213.33%
Total44100.00%15100.00%

/* tipc_bearer_reset_all - reset all links on all bearers */
void tipc_bearer_reset_all(struct net *net) { struct tipc_net *tn = tipc_net(net); struct tipc_bearer *b; int i; for (i = 0; i < MAX_BEARERS; i++) { b = rcu_dereference_rtnl(tn->bearer_list[i]); if (b) tipc_reset_bearer(net, b); } }

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jon paul maloyjon paul maloy66100.00%1100.00%
Total66100.00%1100.00%

/** * bearer_disable * * Note: This routine assumes caller holds RTNL lock. */
static void bearer_disable(struct net *net, struct tipc_bearer *b) { struct tipc_net *tn = tipc_net(net); int bearer_id = b->identity; pr_info("Disabling bearer <%s>\n", b->name); b->media->disable_media(b); tipc_node_delete_links(net, bearer_id); RCU_INIT_POINTER(b->media_ptr, NULL); if (b->link_req) tipc_disc_delete(b->link_req); RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); kfree_rcu(b, rcu); tipc_mon_delete(net, bearer_id); }

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ying xueying xue3633.96%631.58%
jon paul maloyjon paul maloy3331.13%526.32%
per lidenper liden1816.98%15.26%
allan stephensallan stephens1312.26%526.32%
ding tianhongding tianhong54.72%15.26%
erik hugneerik hugne10.94%15.26%
Total106100.00%19100.00%


int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, struct nlattr *attr[]) { struct net_device *dev; char *driver_name = strchr((const char *)b->name, ':') + 1; /* Find device with specified name */ dev = dev_get_by_name(net, driver_name); if (!dev) return -ENODEV; /* Associate TIPC bearer with L2 bearer */ rcu_assign_pointer(b->media_ptr, dev); memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); b->bcast_addr.media_id = b->media->type_id; b->bcast_addr.broadcast = 1; b->mtu = dev->mtu; b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); rcu_assign_pointer(dev->tipc_ptr, b); return 0; }

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jon paul maloyjon paul maloy74.05%120.00%
erik hugneerik hugne63.47%120.00%
Total173100.00%5100.00%

/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface * * Mark L2 bearer as inactive so that incoming buffers are thrown away */
void tipc_disable_l2_media(struct tipc_bearer *b) { struct net_device *dev; dev = (struct net_device *)rtnl_dereference(b->media_ptr); RCU_INIT_POINTER(dev->tipc_ptr, NULL); synchronize_net(); dev_put(dev); }

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/** * tipc_l2_send_msg - send a TIPC packet out over an L2 interface * @skb: the packet to be sent * @b: the bearer through which the packet is to be sent * @dest: peer destination address */
int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, struct tipc_bearer *b, struct tipc_media_addr *dest) { struct net_device *dev; int delta; void *tipc_ptr; dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); if (!dev) return 0; /* Send RESET message even if bearer is detached from device */ tipc_ptr = rcu_dereference_rtnl(dev->tipc_ptr); if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb)))) goto drop; delta = dev->hard_header_len - skb_headroom(skb); if ((delta > 0) && pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) goto drop; skb_reset_network_header(skb); skb->dev = dev; skb->protocol = htons(ETH_P_TIPC); dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, dev->dev_addr, skb->len); dev_queue_xmit(skb); return 0; drop: kfree_skb(skb); return 0; }

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int tipc_bearer_mtu(struct net *net, u32 bearer_id) { int mtu = 0; struct tipc_bearer *b; rcu_read_lock(); b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); if (b) mtu = b->mtu; rcu_read_unlock(); return mtu; }

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/* tipc_bearer_xmit_skb - sends buffer to destination over bearer */
void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, struct sk_buff *skb, struct tipc_media_addr *dest) { struct tipc_net *tn = tipc_net(net); struct tipc_bearer *b; rcu_read_lock(); b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); if (likely(b)) b->media->send_msg(net, skb, b, dest); else kfree_skb(skb); rcu_read_unlock(); }

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/* tipc_bearer_xmit() -send buffer to destination over bearer */
void tipc_bearer_xmit(struct net *net, u32 bearer_id, struct sk_buff_head *xmitq, struct tipc_media_addr *dst) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_bearer *b; struct sk_buff *skb, *tmp; if (skb_queue_empty(xmitq)) return; rcu_read_lock(); b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); if (unlikely(!b)) __skb_queue_purge(xmitq); skb_queue_walk_safe(xmitq, skb, tmp) { __skb_dequeue(xmitq); b->media->send_msg(net, skb, b, dst); } rcu_read_unlock(); }

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jon paul maloyjon paul maloy117100.00%2100.00%
Total117100.00%2100.00%

/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations */
void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, struct sk_buff_head *xmitq) { struct tipc_net *tn = tipc_net(net); int net_id = tn->net_id; struct tipc_bearer *b; struct sk_buff *skb, *tmp; struct tipc_msg *hdr; rcu_read_lock(); b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); if (unlikely(!b)) __skb_queue_purge(xmitq); skb_queue_walk_safe(xmitq, skb, tmp) { hdr = buf_msg(skb); msg_set_non_seq(hdr, 1); msg_set_mc_netid(hdr, net_id); __skb_dequeue(xmitq); b->media->send_msg(net, skb, b, &b->bcast_addr); } rcu_read_unlock(); }

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jon paul maloyjon paul maloy138100.00%2100.00%
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/** * tipc_l2_rcv_msg - handle incoming TIPC message from an interface * @buf: the received packet * @dev: the net device that the packet was received on * @pt: the packet_type structure which was used to register this handler * @orig_dev: the original receive net device in case the device is a bond * * Accept only packets explicitly sent to this node, or broadcast packets; * ignores packets sent using interface multicast, and traffic sent to other * nodes (which can happen if interface is running in promiscuous mode). */
static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) { struct tipc_bearer *b; rcu_read_lock(); b = rcu_dereference_rtnl(dev->tipc_ptr); if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) { skb->next = NULL; tipc_rcv(dev_net(dev), skb, b); rcu_read_unlock(); return NET_RX_SUCCESS; } rcu_read_unlock(); kfree_skb(skb); return NET_RX_DROP; }

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/** * tipc_l2_device_event - handle device events from network device * @nb: the context of the notification * @evt: the type of event * @ptr: the net device that the event was on * * This function is called by the Ethernet driver in case of link * change event. */
static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct net *net = dev_net(dev); struct tipc_net *tn = tipc_net(net); struct tipc_bearer *b; int i; b = rtnl_dereference(dev->tipc_ptr); if (!b) { for (i = 0; i < MAX_BEARERS; b = NULL, i++) { b = rtnl_dereference(tn->bearer_list[i]); if (b && (b->media_ptr == dev)) break; } } if (!b) return NOTIFY_DONE; b->mtu = dev->mtu; switch (evt) { case NETDEV_CHANGE: if (netif_carrier_ok(dev)) break; case NETDEV_UP: rcu_assign_pointer(dev->tipc_ptr, b); break; case NETDEV_GOING_DOWN: RCU_INIT_POINTER(dev->tipc_ptr, NULL); synchronize_net(); tipc_reset_bearer(net, b); break; case NETDEV_CHANGEMTU: tipc_reset_bearer(net, b); break; case NETDEV_CHANGEADDR: b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); tipc_reset_bearer(net, b); break; case NETDEV_UNREGISTER: case NETDEV_CHANGENAME: bearer_disable(dev_net(dev), b); break; } return NOTIFY_OK; }

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erik hugneerik hugne208.00%110.00%
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static struct packet_type tipc_packet_type __read_mostly = { .type = htons(ETH_P_TIPC), .func = tipc_l2_rcv_msg, }; static struct notifier_block notifier = { .notifier_call = tipc_l2_device_event, .priority = 0, };
int tipc_bearer_setup(void) { int err; err = register_netdevice_notifier(&notifier); if (err) return err; dev_add_pack(&tipc_packet_type); return 0; }

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void tipc_bearer_cleanup(void) { unregister_netdevice_notifier(&notifier); dev_remove_pack(&tipc_packet_type); }

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void tipc_bearer_stop(struct net *net) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_bearer *b; u32 i; for (i = 0; i < MAX_BEARERS; i++) { b = rtnl_dereference(tn->bearer_list[i]); if (b) { bearer_disable(net, b); tn->bearer_list[i] =