forked from Minki/linux
26394fc118
Some time ago8965779d2c("ipv6,mcast: always hold idev->lock before mca_lock") switched ipv6_get_lladdr() to __ipv6_get_lladdr(), which is rcu-unsafe version. That was OK, because idev->lock was held for these codepaths. In88e2ca3080("mld: convert ifmcaddr6 to RCU") these external locks were removed, so we probably need to restore the original rcu-safe call. Otherwise, we occasionally get a machine crashed/stalled with the following in dmesg: [ 3405.966610][T230589] general protection fault, probably for non-canonical address 0xdead00000000008c: 0000 [#1] SMP NOPTI [ 3405.982083][T230589] CPU: 44 PID: 230589 Comm: kworker/44:3 Tainted: G O 5.15.19-cloudflare-2022.2.1 #1 [ 3405.998061][T230589] Hardware name: SUPA-COOL-SERV [ 3406.009552][T230589] Workqueue: mld mld_ifc_work [ 3406.017224][T230589] RIP: 0010:__ipv6_get_lladdr+0x34/0x60 [ 3406.025780][T230589] Code: 57 10 48 83 c7 08 48 89 e5 48 39 d7 74 3e 48 8d 82 38 ff ff ff eb 13 48 8b 90 d0 00 00 00 48 8d 82 38 ff ff ff 48 39 d7 74 22 <66> 83 78 32 20 77 1b 75 e4 89 ca 23 50 2c 75 dd 48 8b 50 08 48 8b [ 3406.055748][T230589] RSP: 0018:ffff94e4b3fc3d10 EFLAGS: 00010202 [ 3406.065617][T230589] RAX: dead00000000005a RBX: ffff94e4b3fc3d30 RCX: 0000000000000040 [ 3406.077477][T230589] RDX: dead000000000122 RSI: ffff94e4b3fc3d30 RDI: ffff8c3a31431008 [ 3406.089389][T230589] RBP: ffff94e4b3fc3d10 R08: 0000000000000000 R09: 0000000000000000 [ 3406.101445][T230589] R10: ffff8c3a31430000 R11: 000000000000000b R12: ffff8c2c37887100 [ 3406.113553][T230589] R13: ffff8c3a39537000 R14: 00000000000005dc R15: ffff8c3a31431000 [ 3406.125730][T230589] FS: 0000000000000000(0000) GS:ffff8c3b9fc80000(0000) knlGS:0000000000000000 [ 3406.138992][T230589] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3406.149895][T230589] CR2: 00007f0dfea1db60 CR3: 000000387b5f2000 CR4: 0000000000350ee0 [ 3406.162421][T230589] Call Trace: [ 3406.170235][T230589] <TASK> [ 3406.177736][T230589] mld_newpack+0xfe/0x1a0 [ 3406.186686][T230589] add_grhead+0x87/0xa0 [ 3406.195498][T230589] add_grec+0x485/0x4e0 [ 3406.204310][T230589] ? newidle_balance+0x126/0x3f0 [ 3406.214024][T230589] mld_ifc_work+0x15d/0x450 [ 3406.223279][T230589] process_one_work+0x1e6/0x380 [ 3406.232982][T230589] worker_thread+0x50/0x3a0 [ 3406.242371][T230589] ? rescuer_thread+0x360/0x360 [ 3406.252175][T230589] kthread+0x127/0x150 [ 3406.261197][T230589] ? set_kthread_struct+0x40/0x40 [ 3406.271287][T230589] ret_from_fork+0x22/0x30 [ 3406.280812][T230589] </TASK> [ 3406.288937][T230589] Modules linked in: ... [last unloaded: kheaders] [ 3406.476714][T230589] ---[ end trace 3525a7655f2f3b9e ]--- Fixes:88e2ca3080("mld: convert ifmcaddr6 to RCU") Reported-by: David Pinilla Caparros <dpini@cloudflare.com> Signed-off-by: Ignat Korchagin <ignat@cloudflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
505 lines
14 KiB
C
505 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ADDRCONF_H
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#define _ADDRCONF_H
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#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
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#define RTR_SOLICITATION_INTERVAL (4*HZ)
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#define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */
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#define MIN_VALID_LIFETIME (2*3600) /* 2 hours */
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#define TEMP_VALID_LIFETIME (7*86400)
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#define TEMP_PREFERRED_LIFETIME (86400)
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#define REGEN_MAX_RETRY (3)
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#define MAX_DESYNC_FACTOR (600)
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#define ADDR_CHECK_FREQUENCY (120*HZ)
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#define IPV6_MAX_ADDRESSES 16
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#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
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#define ADDRCONF_TIMER_FUZZ (HZ / 4)
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#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
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#define ADDRCONF_NOTIFY_PRIORITY 0
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#include <linux/in.h>
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#include <linux/in6.h>
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struct prefix_info {
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__u8 type;
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__u8 length;
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__u8 prefix_len;
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#if defined(__BIG_ENDIAN_BITFIELD)
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__u8 onlink : 1,
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autoconf : 1,
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reserved : 6;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 reserved : 6,
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autoconf : 1,
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onlink : 1;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be32 valid;
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__be32 prefered;
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__be32 reserved2;
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struct in6_addr prefix;
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};
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#include <linux/ipv6.h>
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#include <linux/netdevice.h>
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#include <net/if_inet6.h>
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#include <net/ipv6.h>
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struct in6_validator_info {
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struct in6_addr i6vi_addr;
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struct inet6_dev *i6vi_dev;
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struct netlink_ext_ack *extack;
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};
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struct ifa6_config {
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const struct in6_addr *pfx;
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unsigned int plen;
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const struct in6_addr *peer_pfx;
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u32 rt_priority;
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u32 ifa_flags;
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u32 preferred_lft;
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u32 valid_lft;
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u16 scope;
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};
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int addrconf_init(void);
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void addrconf_cleanup(void);
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int addrconf_add_ifaddr(struct net *net, void __user *arg);
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int addrconf_del_ifaddr(struct net *net, void __user *arg);
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int addrconf_set_dstaddr(struct net *net, void __user *arg);
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int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
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const struct net_device *dev, int strict);
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int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
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const struct net_device *dev, bool skip_dev_check,
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int strict, u32 banned_flags);
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
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#endif
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int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
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unsigned char nsegs);
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bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
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const unsigned int prefix_len,
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struct net_device *dev);
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int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
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struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
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struct net_device *dev);
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struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
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const struct in6_addr *addr,
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struct net_device *dev, int strict);
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int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
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const struct in6_addr *daddr, unsigned int srcprefs,
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struct in6_addr *saddr);
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int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
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u32 banned_flags);
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bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
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bool match_wildcard);
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bool inet_rcv_saddr_any(const struct sock *sk);
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void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
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void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
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void addrconf_add_linklocal(struct inet6_dev *idev,
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const struct in6_addr *addr, u32 flags);
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int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
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const struct prefix_info *pinfo,
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struct inet6_dev *in6_dev,
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const struct in6_addr *addr, int addr_type,
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u32 addr_flags, bool sllao, bool tokenized,
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__u32 valid_lft, u32 prefered_lft);
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static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
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{
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memcpy(eui, addr, 3);
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eui[3] = 0xFF;
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eui[4] = 0xFE;
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memcpy(eui + 5, addr + 3, 3);
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}
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static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
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{
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addrconf_addr_eui48_base(eui, addr);
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eui[0] ^= 2;
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}
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static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
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{
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if (dev->addr_len != ETH_ALEN)
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return -1;
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/*
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* The zSeries OSA network cards can be shared among various
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* OS instances, but the OSA cards have only one MAC address.
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* This leads to duplicate address conflicts in conjunction
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* with IPv6 if more than one instance uses the same card.
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*
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* The driver for these cards can deliver a unique 16-bit
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* identifier for each instance sharing the same card. It is
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* placed instead of 0xFFFE in the interface identifier. The
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* "u" bit of the interface identifier is not inverted in this
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* case. Hence the resulting interface identifier has local
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* scope according to RFC2373.
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*/
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addrconf_addr_eui48_base(eui, dev->dev_addr);
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if (dev->dev_id) {
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eui[3] = (dev->dev_id >> 8) & 0xFF;
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eui[4] = dev->dev_id & 0xFF;
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} else {
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eui[0] ^= 2;
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}
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return 0;
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}
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static inline unsigned long addrconf_timeout_fixup(u32 timeout,
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unsigned int unit)
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{
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if (timeout == 0xffffffff)
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return ~0UL;
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/*
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* Avoid arithmetic overflow.
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* Assuming unit is constant and non-zero, this "if" statement
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* will go away on 64bit archs.
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*/
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if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
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return LONG_MAX / unit;
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return timeout;
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}
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static inline int addrconf_finite_timeout(unsigned long timeout)
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{
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return ~timeout;
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}
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/*
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* IPv6 Address Label subsystem (addrlabel.c)
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*/
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int ipv6_addr_label_init(void);
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void ipv6_addr_label_cleanup(void);
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int ipv6_addr_label_rtnl_register(void);
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u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
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int type, int ifindex);
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/*
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* multicast prototypes (mcast.c)
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*/
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static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
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unsigned int len)
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{
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if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
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return false;
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return pskb_may_pull(skb, len);
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}
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int ipv6_sock_mc_join(struct sock *sk, int ifindex,
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const struct in6_addr *addr);
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int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
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const struct in6_addr *addr);
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void __ipv6_sock_mc_close(struct sock *sk);
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void ipv6_sock_mc_close(struct sock *sk);
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bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
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const struct in6_addr *src_addr);
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int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
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int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
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int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
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void ipv6_mc_up(struct inet6_dev *idev);
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void ipv6_mc_down(struct inet6_dev *idev);
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void ipv6_mc_unmap(struct inet6_dev *idev);
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void ipv6_mc_remap(struct inet6_dev *idev);
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void ipv6_mc_init_dev(struct inet6_dev *idev);
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void ipv6_mc_destroy_dev(struct inet6_dev *idev);
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int ipv6_mc_check_mld(struct sk_buff *skb);
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void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
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bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
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const struct in6_addr *src_addr);
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void ipv6_mc_dad_complete(struct inet6_dev *idev);
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/*
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* identify MLD packets for MLD filter exceptions
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*/
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static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
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{
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struct icmp6hdr *hdr;
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if (nexthdr != IPPROTO_ICMPV6 ||
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!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
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return false;
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hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
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switch (hdr->icmp6_type) {
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case ICMPV6_MGM_QUERY:
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case ICMPV6_MGM_REPORT:
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case ICMPV6_MGM_REDUCTION:
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case ICMPV6_MLD2_REPORT:
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return true;
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default:
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break;
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}
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return false;
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}
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void addrconf_prefix_rcv(struct net_device *dev,
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u8 *opt, int len, bool sllao);
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/*
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* anycast prototypes (anycast.c)
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*/
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int ipv6_sock_ac_join(struct sock *sk, int ifindex,
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const struct in6_addr *addr);
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int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
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const struct in6_addr *addr);
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void __ipv6_sock_ac_close(struct sock *sk);
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void ipv6_sock_ac_close(struct sock *sk);
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int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
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int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
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void ipv6_ac_destroy_dev(struct inet6_dev *idev);
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bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
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const struct in6_addr *addr);
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bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
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const struct in6_addr *addr);
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int ipv6_anycast_init(void);
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void ipv6_anycast_cleanup(void);
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/* Device notifier */
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int register_inet6addr_notifier(struct notifier_block *nb);
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int unregister_inet6addr_notifier(struct notifier_block *nb);
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int inet6addr_notifier_call_chain(unsigned long val, void *v);
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int register_inet6addr_validator_notifier(struct notifier_block *nb);
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int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
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int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
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void inet6_netconf_notify_devconf(struct net *net, int event, int type,
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int ifindex, struct ipv6_devconf *devconf);
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/**
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* __in6_dev_get - get inet6_dev pointer from netdevice
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* @dev: network device
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*
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* Caller must hold rcu_read_lock or RTNL, because this function
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* does not take a reference on the inet6_dev.
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*/
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static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
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{
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return rcu_dereference_rtnl(dev->ip6_ptr);
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}
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/**
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* __in6_dev_stats_get - get inet6_dev pointer for stats
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* @dev: network device
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* @skb: skb for original incoming interface if neeeded
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*
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* Caller must hold rcu_read_lock or RTNL, because this function
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* does not take a reference on the inet6_dev.
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*/
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static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
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const struct sk_buff *skb)
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{
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if (netif_is_l3_master(dev))
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dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
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return __in6_dev_get(dev);
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}
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/**
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* __in6_dev_get_safely - get inet6_dev pointer from netdevice
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* @dev: network device
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*
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* This is a safer version of __in6_dev_get
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*/
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static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
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{
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if (likely(dev))
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return rcu_dereference_rtnl(dev->ip6_ptr);
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else
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return NULL;
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}
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/**
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* in6_dev_get - get inet6_dev pointer from netdevice
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* @dev: network device
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*
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* This version can be used in any context, and takes a reference
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* on the inet6_dev. Callers must use in6_dev_put() later to
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* release this reference.
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*/
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static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
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{
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struct inet6_dev *idev;
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rcu_read_lock();
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idev = rcu_dereference(dev->ip6_ptr);
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if (idev)
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refcount_inc(&idev->refcnt);
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rcu_read_unlock();
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return idev;
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}
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static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
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{
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struct inet6_dev *idev = __in6_dev_get(dev);
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return idev ? idev->nd_parms : NULL;
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}
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void in6_dev_finish_destroy(struct inet6_dev *idev);
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static inline void in6_dev_put(struct inet6_dev *idev)
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{
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if (refcount_dec_and_test(&idev->refcnt))
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in6_dev_finish_destroy(idev);
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}
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static inline void in6_dev_put_clear(struct inet6_dev **pidev)
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{
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struct inet6_dev *idev = *pidev;
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if (idev) {
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in6_dev_put(idev);
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*pidev = NULL;
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}
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}
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static inline void __in6_dev_put(struct inet6_dev *idev)
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{
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refcount_dec(&idev->refcnt);
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}
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static inline void in6_dev_hold(struct inet6_dev *idev)
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{
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refcount_inc(&idev->refcnt);
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}
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/* called with rcu_read_lock held */
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static inline bool ip6_ignore_linkdown(const struct net_device *dev)
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{
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const struct inet6_dev *idev = __in6_dev_get(dev);
|
|
|
|
return !!idev->cnf.ignore_routes_with_linkdown;
|
|
}
|
|
|
|
void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
|
|
|
|
static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
|
|
{
|
|
if (refcount_dec_and_test(&ifp->refcnt))
|
|
inet6_ifa_finish_destroy(ifp);
|
|
}
|
|
|
|
static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
|
|
{
|
|
refcount_dec(&ifp->refcnt);
|
|
}
|
|
|
|
static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
|
|
{
|
|
refcount_inc(&ifp->refcnt);
|
|
}
|
|
|
|
|
|
/*
|
|
* compute link-local solicited-node multicast address
|
|
*/
|
|
|
|
static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
|
|
struct in6_addr *solicited)
|
|
{
|
|
ipv6_addr_set(solicited,
|
|
htonl(0xFF020000), 0,
|
|
htonl(0x1),
|
|
htonl(0xFF000000) | addr->s6_addr32[3]);
|
|
}
|
|
|
|
static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
|
|
{
|
|
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
|
|
__be64 *p = (__force __be64 *)addr;
|
|
return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
|
|
#else
|
|
return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
|
|
addr->s6_addr32[1] | addr->s6_addr32[2] |
|
|
(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
|
|
#endif
|
|
}
|
|
|
|
static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
|
|
{
|
|
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
|
|
__be64 *p = (__force __be64 *)addr;
|
|
return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
|
|
#else
|
|
return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
|
|
addr->s6_addr32[1] | addr->s6_addr32[2] |
|
|
(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
|
|
#endif
|
|
}
|
|
|
|
static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
|
|
{
|
|
return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
|
|
}
|
|
|
|
static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
|
|
{
|
|
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
|
|
__be64 *p = (__force __be64 *)addr;
|
|
return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
|
|
((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
|
|
cpu_to_be64(0xffffffffff000000UL))) == 0UL;
|
|
#else
|
|
return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
|
|
addr->s6_addr32[1] |
|
|
(addr->s6_addr32[2] ^ htonl(0x00000001)) |
|
|
(addr->s6_addr[12] ^ 0xff)) == 0;
|
|
#endif
|
|
}
|
|
|
|
static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
|
|
{
|
|
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
|
|
__be64 *p = (__force __be64 *)addr;
|
|
|
|
return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
|
|
(p[1] ^ cpu_to_be64(0x6a))) == 0UL;
|
|
#else
|
|
return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
|
|
addr->s6_addr32[1] | addr->s6_addr32[2] |
|
|
(addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
int if6_proc_init(void);
|
|
void if6_proc_exit(void);
|
|
#endif
|
|
|
|
#endif
|