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![Eric Dumazet](/assets/img/avatar_default.png)
If tbl_mpp can not be allocated, we call mesh_table_free(tbl_path)
while tbl_path rhashtable has not yet been initialized, which causes
panics.
Simply factorize the rhashtable_init() call into mesh_table_alloc()
WARNING: CPU: 1 PID: 8474 at kernel/workqueue.c:3040 __flush_work kernel/workqueue.c:3040 [inline]
WARNING: CPU: 1 PID: 8474 at kernel/workqueue.c:3040 __cancel_work_timer+0x514/0x540 kernel/workqueue.c:3136
Modules linked in:
CPU: 1 PID: 8474 Comm: syz-executor663 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__flush_work kernel/workqueue.c:3040 [inline]
RIP: 0010:__cancel_work_timer+0x514/0x540 kernel/workqueue.c:3136
Code: 5d c3 e8 bf ae 29 00 0f 0b e9 f0 fd ff ff e8 b3 ae 29 00 0f 0b 43 80 3c 3e 00 0f 85 31 ff ff ff e9 34 ff ff ff e8 9c ae 29 00 <0f> 0b e9 dc fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 7d fd ff
RSP: 0018:ffffc9000165f5a0 EFLAGS: 00010293
RAX: ffffffff814b7064 RBX: 0000000000000001 RCX: ffff888021c80000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888024039ca0 R08: dffffc0000000000 R09: fffffbfff1dd3e64
R10: fffffbfff1dd3e64 R11: 0000000000000000 R12: 1ffff920002cbebd
R13: ffff888024039c88 R14: 1ffff11004807391 R15: dffffc0000000000
FS: 0000000001347880(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 000000002cc0a000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rhashtable_free_and_destroy+0x25/0x9c0 lib/rhashtable.c:1137
mesh_table_free net/mac80211/mesh_pathtbl.c:69 [inline]
mesh_pathtbl_init+0x287/0x2e0 net/mac80211/mesh_pathtbl.c:785
ieee80211_mesh_init_sdata+0x2ee/0x530 net/mac80211/mesh.c:1591
ieee80211_setup_sdata+0x733/0xc40 net/mac80211/iface.c:1569
ieee80211_if_add+0xd5c/0x1cd0 net/mac80211/iface.c:1987
ieee80211_add_iface+0x59/0x130 net/mac80211/cfg.c:125
rdev_add_virtual_intf net/wireless/rdev-ops.h:45 [inline]
nl80211_new_interface+0x563/0xb40 net/wireless/nl80211.c:3855
genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
genl_rcv_msg+0xe4e/0x1280 net/netlink/genetlink.c:800
netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2494
genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x780/0x930 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x9a8/0xd40 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg net/socket.c:671 [inline]
____sys_sendmsg+0x519/0x800 net/socket.c:2353
___sys_sendmsg net/socket.c:2407 [inline]
__sys_sendmsg+0x2b1/0x360 net/socket.c:2440
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes: 60854fd945
("mac80211: mesh: convert path table to rhashtable")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Link: https://lore.kernel.org/r/20201204162428.2583119-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
814 lines
21 KiB
C
814 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2008, 2009 open80211s Ltd.
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* Author: Luis Carlos Cobo <luisca@cozybit.com>
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*/
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#include <linux/etherdevice.h>
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#include <linux/list.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <net/mac80211.h>
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#include "wme.h"
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#include "ieee80211_i.h"
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#include "mesh.h"
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static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath);
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static u32 mesh_table_hash(const void *addr, u32 len, u32 seed)
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{
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/* Use last four bytes of hw addr as hash index */
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return jhash_1word(__get_unaligned_cpu32((u8 *)addr + 2), seed);
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}
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static const struct rhashtable_params mesh_rht_params = {
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.nelem_hint = 2,
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.automatic_shrinking = true,
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.key_len = ETH_ALEN,
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.key_offset = offsetof(struct mesh_path, dst),
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.head_offset = offsetof(struct mesh_path, rhash),
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.hashfn = mesh_table_hash,
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};
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static inline bool mpath_expired(struct mesh_path *mpath)
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{
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return (mpath->flags & MESH_PATH_ACTIVE) &&
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time_after(jiffies, mpath->exp_time) &&
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!(mpath->flags & MESH_PATH_FIXED);
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}
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static void mesh_path_rht_free(void *ptr, void *tblptr)
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{
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struct mesh_path *mpath = ptr;
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struct mesh_table *tbl = tblptr;
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mesh_path_free_rcu(tbl, mpath);
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}
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static struct mesh_table *mesh_table_alloc(void)
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{
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struct mesh_table *newtbl;
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newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC);
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if (!newtbl)
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return NULL;
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INIT_HLIST_HEAD(&newtbl->known_gates);
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INIT_HLIST_HEAD(&newtbl->walk_head);
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atomic_set(&newtbl->entries, 0);
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spin_lock_init(&newtbl->gates_lock);
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spin_lock_init(&newtbl->walk_lock);
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rhashtable_init(&newtbl->rhead, &mesh_rht_params);
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return newtbl;
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}
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static void mesh_table_free(struct mesh_table *tbl)
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{
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rhashtable_free_and_destroy(&tbl->rhead,
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mesh_path_rht_free, tbl);
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kfree(tbl);
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}
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/**
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* mesh_path_assign_nexthop - update mesh path next hop
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*
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* @mpath: mesh path to update
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* @sta: next hop to assign
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*
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* Locking: mpath->state_lock must be held when calling this function
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*/
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void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta)
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{
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struct sk_buff *skb;
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struct ieee80211_hdr *hdr;
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unsigned long flags;
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rcu_assign_pointer(mpath->next_hop, sta);
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spin_lock_irqsave(&mpath->frame_queue.lock, flags);
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skb_queue_walk(&mpath->frame_queue, skb) {
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hdr = (struct ieee80211_hdr *) skb->data;
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memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
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memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN);
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ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr);
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}
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spin_unlock_irqrestore(&mpath->frame_queue.lock, flags);
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}
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static void prepare_for_gate(struct sk_buff *skb, char *dst_addr,
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struct mesh_path *gate_mpath)
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{
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struct ieee80211_hdr *hdr;
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struct ieee80211s_hdr *mshdr;
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int mesh_hdrlen, hdrlen;
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char *next_hop;
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hdr = (struct ieee80211_hdr *) skb->data;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
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if (!(mshdr->flags & MESH_FLAGS_AE)) {
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/* size of the fixed part of the mesh header */
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mesh_hdrlen = 6;
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/* make room for the two extended addresses */
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skb_push(skb, 2 * ETH_ALEN);
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memmove(skb->data, hdr, hdrlen + mesh_hdrlen);
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hdr = (struct ieee80211_hdr *) skb->data;
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/* we preserve the previous mesh header and only add
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* the new addreses */
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mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
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mshdr->flags = MESH_FLAGS_AE_A5_A6;
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memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN);
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memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN);
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}
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/* update next hop */
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hdr = (struct ieee80211_hdr *) skb->data;
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rcu_read_lock();
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next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr;
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memcpy(hdr->addr1, next_hop, ETH_ALEN);
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rcu_read_unlock();
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memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN);
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memcpy(hdr->addr3, dst_addr, ETH_ALEN);
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}
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/**
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* mesh_path_move_to_queue - Move or copy frames from one mpath queue to another
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*
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* This function is used to transfer or copy frames from an unresolved mpath to
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* a gate mpath. The function also adds the Address Extension field and
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* updates the next hop.
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*
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* If a frame already has an Address Extension field, only the next hop and
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* destination addresses are updated.
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*
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* The gate mpath must be an active mpath with a valid mpath->next_hop.
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*
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* @gate_mpath: An active mpath the frames will be sent to (i.e. the gate)
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* @from_mpath: The failed mpath
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* @copy: When true, copy all the frames to the new mpath queue. When false,
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* move them.
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*/
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static void mesh_path_move_to_queue(struct mesh_path *gate_mpath,
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struct mesh_path *from_mpath,
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bool copy)
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{
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struct sk_buff *skb, *fskb, *tmp;
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struct sk_buff_head failq;
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unsigned long flags;
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if (WARN_ON(gate_mpath == from_mpath))
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return;
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if (WARN_ON(!gate_mpath->next_hop))
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return;
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__skb_queue_head_init(&failq);
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spin_lock_irqsave(&from_mpath->frame_queue.lock, flags);
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skb_queue_splice_init(&from_mpath->frame_queue, &failq);
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spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags);
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skb_queue_walk_safe(&failq, fskb, tmp) {
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if (skb_queue_len(&gate_mpath->frame_queue) >=
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MESH_FRAME_QUEUE_LEN) {
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mpath_dbg(gate_mpath->sdata, "mpath queue full!\n");
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break;
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}
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skb = skb_copy(fskb, GFP_ATOMIC);
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if (WARN_ON(!skb))
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break;
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prepare_for_gate(skb, gate_mpath->dst, gate_mpath);
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skb_queue_tail(&gate_mpath->frame_queue, skb);
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if (copy)
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continue;
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__skb_unlink(fskb, &failq);
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kfree_skb(fskb);
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}
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mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n",
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gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue));
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if (!copy)
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return;
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spin_lock_irqsave(&from_mpath->frame_queue.lock, flags);
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skb_queue_splice(&failq, &from_mpath->frame_queue);
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spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags);
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}
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static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst,
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struct ieee80211_sub_if_data *sdata)
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{
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struct mesh_path *mpath;
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mpath = rhashtable_lookup(&tbl->rhead, dst, mesh_rht_params);
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if (mpath && mpath_expired(mpath)) {
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spin_lock_bh(&mpath->state_lock);
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mpath->flags &= ~MESH_PATH_ACTIVE;
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spin_unlock_bh(&mpath->state_lock);
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}
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return mpath;
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}
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/**
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* mesh_path_lookup - look up a path in the mesh path table
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* @sdata: local subif
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* @dst: hardware address (ETH_ALEN length) of destination
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*
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* Returns: pointer to the mesh path structure, or NULL if not found
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*
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* Locking: must be called within a read rcu section.
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*/
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struct mesh_path *
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mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)
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{
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return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata);
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}
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struct mesh_path *
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mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)
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{
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return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata);
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}
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static struct mesh_path *
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__mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx)
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{
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int i = 0;
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struct mesh_path *mpath;
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hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) {
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if (i++ == idx)
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break;
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}
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if (!mpath)
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return NULL;
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if (mpath_expired(mpath)) {
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spin_lock_bh(&mpath->state_lock);
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mpath->flags &= ~MESH_PATH_ACTIVE;
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spin_unlock_bh(&mpath->state_lock);
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}
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return mpath;
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}
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/**
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* mesh_path_lookup_by_idx - look up a path in the mesh path table by its index
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* @idx: index
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* @sdata: local subif, or NULL for all entries
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*
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* Returns: pointer to the mesh path structure, or NULL if not found.
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*
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* Locking: must be called within a read rcu section.
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*/
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struct mesh_path *
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mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)
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{
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return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx);
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}
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/**
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* mpp_path_lookup_by_idx - look up a path in the proxy path table by its index
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* @idx: index
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* @sdata: local subif, or NULL for all entries
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*
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* Returns: pointer to the proxy path structure, or NULL if not found.
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*
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* Locking: must be called within a read rcu section.
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*/
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struct mesh_path *
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mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)
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{
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return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx);
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}
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/**
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* mesh_path_add_gate - add the given mpath to a mesh gate to our path table
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* @mpath: gate path to add to table
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*/
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int mesh_path_add_gate(struct mesh_path *mpath)
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{
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struct mesh_table *tbl;
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int err;
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rcu_read_lock();
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tbl = mpath->sdata->u.mesh.mesh_paths;
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spin_lock_bh(&mpath->state_lock);
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if (mpath->is_gate) {
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err = -EEXIST;
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spin_unlock_bh(&mpath->state_lock);
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goto err_rcu;
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}
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mpath->is_gate = true;
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mpath->sdata->u.mesh.num_gates++;
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spin_lock(&tbl->gates_lock);
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hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates);
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spin_unlock(&tbl->gates_lock);
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spin_unlock_bh(&mpath->state_lock);
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mpath_dbg(mpath->sdata,
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"Mesh path: Recorded new gate: %pM. %d known gates\n",
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mpath->dst, mpath->sdata->u.mesh.num_gates);
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err = 0;
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err_rcu:
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rcu_read_unlock();
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return err;
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}
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/**
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* mesh_gate_del - remove a mesh gate from the list of known gates
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* @tbl: table which holds our list of known gates
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* @mpath: gate mpath
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*/
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static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath)
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{
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lockdep_assert_held(&mpath->state_lock);
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if (!mpath->is_gate)
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return;
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mpath->is_gate = false;
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spin_lock_bh(&tbl->gates_lock);
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hlist_del_rcu(&mpath->gate_list);
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mpath->sdata->u.mesh.num_gates--;
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spin_unlock_bh(&tbl->gates_lock);
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mpath_dbg(mpath->sdata,
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"Mesh path: Deleted gate: %pM. %d known gates\n",
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mpath->dst, mpath->sdata->u.mesh.num_gates);
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}
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/**
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* mesh_gate_num - number of gates known to this interface
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* @sdata: subif data
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*/
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int mesh_gate_num(struct ieee80211_sub_if_data *sdata)
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{
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return sdata->u.mesh.num_gates;
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}
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static
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struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata,
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const u8 *dst, gfp_t gfp_flags)
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{
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struct mesh_path *new_mpath;
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new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags);
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if (!new_mpath)
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return NULL;
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memcpy(new_mpath->dst, dst, ETH_ALEN);
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eth_broadcast_addr(new_mpath->rann_snd_addr);
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new_mpath->is_root = false;
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new_mpath->sdata = sdata;
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new_mpath->flags = 0;
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skb_queue_head_init(&new_mpath->frame_queue);
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new_mpath->exp_time = jiffies;
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spin_lock_init(&new_mpath->state_lock);
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timer_setup(&new_mpath->timer, mesh_path_timer, 0);
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return new_mpath;
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}
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/**
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* mesh_path_add - allocate and add a new path to the mesh path table
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* @dst: destination address of the path (ETH_ALEN length)
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* @sdata: local subif
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*
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* Returns: 0 on success
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*
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* State: the initial state of the new path is set to 0
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*/
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struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata,
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const u8 *dst)
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{
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struct mesh_table *tbl;
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struct mesh_path *mpath, *new_mpath;
|
|
|
|
if (ether_addr_equal(dst, sdata->vif.addr))
|
|
/* never add ourselves as neighbours */
|
|
return ERR_PTR(-ENOTSUPP);
|
|
|
|
if (is_multicast_ether_addr(dst))
|
|
return ERR_PTR(-ENOTSUPP);
|
|
|
|
if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0)
|
|
return ERR_PTR(-ENOSPC);
|
|
|
|
new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC);
|
|
if (!new_mpath)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
tbl = sdata->u.mesh.mesh_paths;
|
|
spin_lock_bh(&tbl->walk_lock);
|
|
mpath = rhashtable_lookup_get_insert_fast(&tbl->rhead,
|
|
&new_mpath->rhash,
|
|
mesh_rht_params);
|
|
if (!mpath)
|
|
hlist_add_head(&new_mpath->walk_list, &tbl->walk_head);
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
|
|
if (mpath) {
|
|
kfree(new_mpath);
|
|
|
|
if (IS_ERR(mpath))
|
|
return mpath;
|
|
|
|
new_mpath = mpath;
|
|
}
|
|
|
|
sdata->u.mesh.mesh_paths_generation++;
|
|
return new_mpath;
|
|
}
|
|
|
|
int mpp_path_add(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *dst, const u8 *mpp)
|
|
{
|
|
struct mesh_table *tbl;
|
|
struct mesh_path *new_mpath;
|
|
int ret;
|
|
|
|
if (ether_addr_equal(dst, sdata->vif.addr))
|
|
/* never add ourselves as neighbours */
|
|
return -ENOTSUPP;
|
|
|
|
if (is_multicast_ether_addr(dst))
|
|
return -ENOTSUPP;
|
|
|
|
new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC);
|
|
|
|
if (!new_mpath)
|
|
return -ENOMEM;
|
|
|
|
memcpy(new_mpath->mpp, mpp, ETH_ALEN);
|
|
tbl = sdata->u.mesh.mpp_paths;
|
|
|
|
spin_lock_bh(&tbl->walk_lock);
|
|
ret = rhashtable_lookup_insert_fast(&tbl->rhead,
|
|
&new_mpath->rhash,
|
|
mesh_rht_params);
|
|
if (!ret)
|
|
hlist_add_head_rcu(&new_mpath->walk_list, &tbl->walk_head);
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
|
|
if (ret)
|
|
kfree(new_mpath);
|
|
|
|
sdata->u.mesh.mpp_paths_generation++;
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* mesh_plink_broken - deactivates paths and sends perr when a link breaks
|
|
*
|
|
* @sta: broken peer link
|
|
*
|
|
* This function must be called from the rate control algorithm if enough
|
|
* delivery errors suggest that a peer link is no longer usable.
|
|
*/
|
|
void mesh_plink_broken(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct mesh_table *tbl = sdata->u.mesh.mesh_paths;
|
|
static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
|
|
struct mesh_path *mpath;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) {
|
|
if (rcu_access_pointer(mpath->next_hop) == sta &&
|
|
mpath->flags & MESH_PATH_ACTIVE &&
|
|
!(mpath->flags & MESH_PATH_FIXED)) {
|
|
spin_lock_bh(&mpath->state_lock);
|
|
mpath->flags &= ~MESH_PATH_ACTIVE;
|
|
++mpath->sn;
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
mesh_path_error_tx(sdata,
|
|
sdata->u.mesh.mshcfg.element_ttl,
|
|
mpath->dst, mpath->sn,
|
|
WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void mesh_path_free_rcu(struct mesh_table *tbl,
|
|
struct mesh_path *mpath)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = mpath->sdata;
|
|
|
|
spin_lock_bh(&mpath->state_lock);
|
|
mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED;
|
|
mesh_gate_del(tbl, mpath);
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
del_timer_sync(&mpath->timer);
|
|
atomic_dec(&sdata->u.mesh.mpaths);
|
|
atomic_dec(&tbl->entries);
|
|
mesh_path_flush_pending(mpath);
|
|
kfree_rcu(mpath, rcu);
|
|
}
|
|
|
|
static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath)
|
|
{
|
|
hlist_del_rcu(&mpath->walk_list);
|
|
rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params);
|
|
mesh_path_free_rcu(tbl, mpath);
|
|
}
|
|
|
|
/**
|
|
* mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches
|
|
*
|
|
* @sta: mesh peer to match
|
|
*
|
|
* RCU notes: this function is called when a mesh plink transitions from
|
|
* PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that
|
|
* allows path creation. This will happen before the sta can be freed (because
|
|
* sta_info_destroy() calls this) so any reader in a rcu read block will be
|
|
* protected against the plink disappearing.
|
|
*/
|
|
void mesh_path_flush_by_nexthop(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct mesh_table *tbl = sdata->u.mesh.mesh_paths;
|
|
struct mesh_path *mpath;
|
|
struct hlist_node *n;
|
|
|
|
spin_lock_bh(&tbl->walk_lock);
|
|
hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) {
|
|
if (rcu_access_pointer(mpath->next_hop) == sta)
|
|
__mesh_path_del(tbl, mpath);
|
|
}
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
}
|
|
|
|
static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *proxy)
|
|
{
|
|
struct mesh_table *tbl = sdata->u.mesh.mpp_paths;
|
|
struct mesh_path *mpath;
|
|
struct hlist_node *n;
|
|
|
|
spin_lock_bh(&tbl->walk_lock);
|
|
hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) {
|
|
if (ether_addr_equal(mpath->mpp, proxy))
|
|
__mesh_path_del(tbl, mpath);
|
|
}
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
}
|
|
|
|
static void table_flush_by_iface(struct mesh_table *tbl)
|
|
{
|
|
struct mesh_path *mpath;
|
|
struct hlist_node *n;
|
|
|
|
spin_lock_bh(&tbl->walk_lock);
|
|
hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) {
|
|
__mesh_path_del(tbl, mpath);
|
|
}
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
}
|
|
|
|
/**
|
|
* mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface
|
|
*
|
|
* This function deletes both mesh paths as well as mesh portal paths.
|
|
*
|
|
* @sdata: interface data to match
|
|
*
|
|
*/
|
|
void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
table_flush_by_iface(sdata->u.mesh.mesh_paths);
|
|
table_flush_by_iface(sdata->u.mesh.mpp_paths);
|
|
}
|
|
|
|
/**
|
|
* table_path_del - delete a path from the mesh or mpp table
|
|
*
|
|
* @tbl: mesh or mpp path table
|
|
* @sdata: local subif
|
|
* @addr: dst address (ETH_ALEN length)
|
|
*
|
|
* Returns: 0 if successful
|
|
*/
|
|
static int table_path_del(struct mesh_table *tbl,
|
|
struct ieee80211_sub_if_data *sdata,
|
|
const u8 *addr)
|
|
{
|
|
struct mesh_path *mpath;
|
|
|
|
spin_lock_bh(&tbl->walk_lock);
|
|
mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params);
|
|
if (!mpath) {
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
return -ENXIO;
|
|
}
|
|
|
|
__mesh_path_del(tbl, mpath);
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* mesh_path_del - delete a mesh path from the table
|
|
*
|
|
* @addr: dst address (ETH_ALEN length)
|
|
* @sdata: local subif
|
|
*
|
|
* Returns: 0 if successful
|
|
*/
|
|
int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
|
|
{
|
|
int err;
|
|
|
|
/* flush relevant mpp entries first */
|
|
mpp_flush_by_proxy(sdata, addr);
|
|
|
|
err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr);
|
|
sdata->u.mesh.mesh_paths_generation++;
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* mesh_path_tx_pending - sends pending frames in a mesh path queue
|
|
*
|
|
* @mpath: mesh path to activate
|
|
*
|
|
* Locking: the state_lock of the mpath structure must NOT be held when calling
|
|
* this function.
|
|
*/
|
|
void mesh_path_tx_pending(struct mesh_path *mpath)
|
|
{
|
|
if (mpath->flags & MESH_PATH_ACTIVE)
|
|
ieee80211_add_pending_skbs(mpath->sdata->local,
|
|
&mpath->frame_queue);
|
|
}
|
|
|
|
/**
|
|
* mesh_path_send_to_gates - sends pending frames to all known mesh gates
|
|
*
|
|
* @mpath: mesh path whose queue will be emptied
|
|
*
|
|
* If there is only one gate, the frames are transferred from the failed mpath
|
|
* queue to that gate's queue. If there are more than one gates, the frames
|
|
* are copied from each gate to the next. After frames are copied, the
|
|
* mpath queues are emptied onto the transmission queue.
|
|
*/
|
|
int mesh_path_send_to_gates(struct mesh_path *mpath)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = mpath->sdata;
|
|
struct mesh_table *tbl;
|
|
struct mesh_path *from_mpath = mpath;
|
|
struct mesh_path *gate;
|
|
bool copy = false;
|
|
|
|
tbl = sdata->u.mesh.mesh_paths;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
|
|
if (gate->flags & MESH_PATH_ACTIVE) {
|
|
mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst);
|
|
mesh_path_move_to_queue(gate, from_mpath, copy);
|
|
from_mpath = gate;
|
|
copy = true;
|
|
} else {
|
|
mpath_dbg(sdata,
|
|
"Not forwarding to %pM (flags %#x)\n",
|
|
gate->dst, gate->flags);
|
|
}
|
|
}
|
|
|
|
hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
|
|
mpath_dbg(sdata, "Sending to %pM\n", gate->dst);
|
|
mesh_path_tx_pending(gate);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return (from_mpath == mpath) ? -EHOSTUNREACH : 0;
|
|
}
|
|
|
|
/**
|
|
* mesh_path_discard_frame - discard a frame whose path could not be resolved
|
|
*
|
|
* @skb: frame to discard
|
|
* @sdata: network subif the frame was to be sent through
|
|
*
|
|
* Locking: the function must me called within a rcu_read_lock region
|
|
*/
|
|
void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
|
|
struct sk_buff *skb)
|
|
{
|
|
kfree_skb(skb);
|
|
sdata->u.mesh.mshstats.dropped_frames_no_route++;
|
|
}
|
|
|
|
/**
|
|
* mesh_path_flush_pending - free the pending queue of a mesh path
|
|
*
|
|
* @mpath: mesh path whose queue has to be freed
|
|
*
|
|
* Locking: the function must me called within a rcu_read_lock region
|
|
*/
|
|
void mesh_path_flush_pending(struct mesh_path *mpath)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL)
|
|
mesh_path_discard_frame(mpath->sdata, skb);
|
|
}
|
|
|
|
/**
|
|
* mesh_path_fix_nexthop - force a specific next hop for a mesh path
|
|
*
|
|
* @mpath: the mesh path to modify
|
|
* @next_hop: the next hop to force
|
|
*
|
|
* Locking: this function must be called holding mpath->state_lock
|
|
*/
|
|
void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop)
|
|
{
|
|
spin_lock_bh(&mpath->state_lock);
|
|
mesh_path_assign_nexthop(mpath, next_hop);
|
|
mpath->sn = 0xffff;
|
|
mpath->metric = 0;
|
|
mpath->hop_count = 0;
|
|
mpath->exp_time = 0;
|
|
mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID;
|
|
mesh_path_activate(mpath);
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg);
|
|
/* init it at a low value - 0 start is tricky */
|
|
ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1);
|
|
mesh_path_tx_pending(mpath);
|
|
}
|
|
|
|
int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct mesh_table *tbl_path, *tbl_mpp;
|
|
int ret;
|
|
|
|
tbl_path = mesh_table_alloc();
|
|
if (!tbl_path)
|
|
return -ENOMEM;
|
|
|
|
tbl_mpp = mesh_table_alloc();
|
|
if (!tbl_mpp) {
|
|
ret = -ENOMEM;
|
|
goto free_path;
|
|
}
|
|
|
|
sdata->u.mesh.mesh_paths = tbl_path;
|
|
sdata->u.mesh.mpp_paths = tbl_mpp;
|
|
|
|
return 0;
|
|
|
|
free_path:
|
|
mesh_table_free(tbl_path);
|
|
return ret;
|
|
}
|
|
|
|
static
|
|
void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata,
|
|
struct mesh_table *tbl)
|
|
{
|
|
struct mesh_path *mpath;
|
|
struct hlist_node *n;
|
|
|
|
spin_lock_bh(&tbl->walk_lock);
|
|
hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) {
|
|
if ((!(mpath->flags & MESH_PATH_RESOLVING)) &&
|
|
(!(mpath->flags & MESH_PATH_FIXED)) &&
|
|
time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))
|
|
__mesh_path_del(tbl, mpath);
|
|
}
|
|
spin_unlock_bh(&tbl->walk_lock);
|
|
}
|
|
|
|
void mesh_path_expire(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths);
|
|
mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths);
|
|
}
|
|
|
|
void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
mesh_table_free(sdata->u.mesh.mesh_paths);
|
|
mesh_table_free(sdata->u.mesh.mpp_paths);
|
|
}
|