Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * net/dst.h Protocol independent destination cache definitions. |
| 4 | * |
| 5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #ifndef _NET_DST_H |
| 10 | #define _NET_DST_H |
| 11 | |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 12 | #include <net/dst_ops.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 13 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/rtnetlink.h> |
| 15 | #include <linux/rcupdate.h> |
Paul Gortmaker | 187f188 | 2011-11-23 20:12:59 -0500 | [diff] [blame] | 16 | #include <linux/bug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/jiffies.h> |
Eric Dumazet | 9620fef | 2017-08-18 12:08:07 -0700 | [diff] [blame] | 18 | #include <linux/refcount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <net/neighbour.h> |
| 20 | #include <asm/processor.h> |
Brian Vazquez | e43b219 | 2021-02-01 17:41:29 +0000 | [diff] [blame] | 21 | #include <linux/indirect_call_wrapper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | struct sk_buff; |
| 24 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 25 | struct dst_entry { |
Alexey Dobriyan | 6672714 | 2017-05-17 19:31:39 +0300 | [diff] [blame] | 26 | struct net_device *dev; |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 27 | struct dst_ops *ops; |
| 28 | unsigned long _metrics; |
YOSHIFUJI Hideaki / 吉藤英明 | ecd9883 | 2013-02-20 00:29:08 +0000 | [diff] [blame] | 29 | unsigned long expires; |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 30 | #ifdef CONFIG_XFRM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct xfrm_state *xfrm; |
Eric Dumazet | 5635c10 | 2008-11-16 19:46:36 -0800 | [diff] [blame] | 32 | #else |
| 33 | void *__pad1; |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 34 | #endif |
Eldad Zack | 7f95e18 | 2012-06-16 15:14:49 +0200 | [diff] [blame] | 35 | int (*input)(struct sk_buff *); |
Eric W. Biederman | ede2059 | 2015-10-07 16:48:47 -0500 | [diff] [blame] | 36 | int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
David S. Miller | 5110effe | 2012-07-02 02:21:03 -0700 | [diff] [blame] | 38 | unsigned short flags; |
David S. Miller | f6b72b62 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 39 | #define DST_NOXFRM 0x0002 |
| 40 | #define DST_NOPOLICY 0x0004 |
Wei Wang | 1eb04e7 | 2017-06-17 10:42:43 -0700 | [diff] [blame] | 41 | #define DST_NOCOUNT 0x0008 |
| 42 | #define DST_FAKE_RTABLE 0x0010 |
| 43 | #define DST_XFRM_TUNNEL 0x0020 |
| 44 | #define DST_XFRM_QUEUE 0x0040 |
| 45 | #define DST_METADATA 0x0080 |
David S. Miller | f6b72b62 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 46 | |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 47 | /* A non-zero value of dst->obsolete forces by-hand validation |
| 48 | * of the route entry. Positive values are set by the generic |
| 49 | * dst layer to indicate that the entry has been forcefully |
| 50 | * destroyed. |
| 51 | * |
| 52 | * Negative values are used by the implementation layer code to |
| 53 | * force invocation of the dst_ops->check() method. |
| 54 | */ |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 55 | short obsolete; |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 56 | #define DST_OBSOLETE_NONE 0 |
| 57 | #define DST_OBSOLETE_DEAD 2 |
| 58 | #define DST_OBSOLETE_FORCE_CHK -1 |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 59 | #define DST_OBSOLETE_KILL -2 |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 60 | unsigned short header_len; /* more space at head required */ |
| 61 | unsigned short trailer_len; /* space to reserve at tail */ |
Julian Anastasov | 51ce8bd | 2017-02-06 23:14:17 +0200 | [diff] [blame] | 62 | |
Zhang Yanmin | f1dd9c3 | 2008-03-12 22:52:37 -0700 | [diff] [blame] | 63 | /* |
| 64 | * __refcnt wants to be on a different cache line from |
| 65 | * input/output/ops or performance tanks badly |
| 66 | */ |
David Miller | 8b207e7 | 2017-11-28 15:40:53 -0500 | [diff] [blame] | 67 | #ifdef CONFIG_64BIT |
| 68 | atomic_t __refcnt; /* 64-bit offset 64 */ |
| 69 | #endif |
Eric Dumazet | 1e19e02 | 2007-02-09 16:26:55 -0800 | [diff] [blame] | 70 | int __use; |
Zhang Yanmin | f1dd9c3 | 2008-03-12 22:52:37 -0700 | [diff] [blame] | 71 | unsigned long lastuse; |
Jiri Benc | 751a587 | 2015-08-21 12:41:14 +0200 | [diff] [blame] | 72 | struct lwtunnel_state *lwtstate; |
David Miller | 8b207e7 | 2017-11-28 15:40:53 -0500 | [diff] [blame] | 73 | struct rcu_head rcu_head; |
| 74 | short error; |
| 75 | short __pad; |
| 76 | __u32 tclassid; |
| 77 | #ifndef CONFIG_64BIT |
| 78 | atomic_t __refcnt; /* 32-bit offset 64 */ |
| 79 | #endif |
Eric Dumazet | 9038c32 | 2021-12-04 20:22:03 -0800 | [diff] [blame] | 80 | netdevice_tracker dev_tracker; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | }; |
| 82 | |
Eric Dumazet | 3fb07da | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 83 | struct dst_metrics { |
| 84 | u32 metrics[RTAX_MAX]; |
Eric Dumazet | 9620fef | 2017-08-18 12:08:07 -0700 | [diff] [blame] | 85 | refcount_t refcnt; |
Geert Uytterhoeven | 258a980 | 2019-12-20 14:31:40 +0100 | [diff] [blame] | 86 | } __aligned(4); /* Low pointer bits contain DST_METRICS_FLAGS */ |
Eric Dumazet | 3fb07da | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 87 | extern const struct dst_metrics dst_default_metrics; |
| 88 | |
Joe Perches | a4023dd | 2013-09-20 11:23:21 -0700 | [diff] [blame] | 89 | u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old); |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 90 | |
Michal Kubeček | e5fd387 | 2014-03-27 13:04:08 +0100 | [diff] [blame] | 91 | #define DST_METRICS_READ_ONLY 0x1UL |
Eric Dumazet | 3fb07da | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 92 | #define DST_METRICS_REFCOUNTED 0x2UL |
Michal Kubeček | e5fd387 | 2014-03-27 13:04:08 +0100 | [diff] [blame] | 93 | #define DST_METRICS_FLAGS 0x3UL |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 94 | #define __DST_METRICS_PTR(Y) \ |
Michal Kubeček | e5fd387 | 2014-03-27 13:04:08 +0100 | [diff] [blame] | 95 | ((u32 *)((Y) & ~DST_METRICS_FLAGS)) |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 96 | #define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics) |
| 97 | |
| 98 | static inline bool dst_metrics_read_only(const struct dst_entry *dst) |
| 99 | { |
| 100 | return dst->_metrics & DST_METRICS_READ_ONLY; |
| 101 | } |
| 102 | |
Joe Perches | a4023dd | 2013-09-20 11:23:21 -0700 | [diff] [blame] | 103 | void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old); |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 104 | |
| 105 | static inline void dst_destroy_metrics_generic(struct dst_entry *dst) |
| 106 | { |
| 107 | unsigned long val = dst->_metrics; |
| 108 | if (!(val & DST_METRICS_READ_ONLY)) |
| 109 | __dst_destroy_metrics_generic(dst, val); |
| 110 | } |
| 111 | |
| 112 | static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst) |
| 113 | { |
| 114 | unsigned long p = dst->_metrics; |
| 115 | |
Stephen Hemminger | 1f37070 | 2011-05-24 13:50:52 -0400 | [diff] [blame] | 116 | BUG_ON(!p); |
| 117 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 118 | if (p & DST_METRICS_READ_ONLY) |
| 119 | return dst->ops->cow_metrics(dst, p); |
| 120 | return __DST_METRICS_PTR(p); |
| 121 | } |
| 122 | |
| 123 | /* This may only be invoked before the entry has reached global |
| 124 | * visibility. |
| 125 | */ |
| 126 | static inline void dst_init_metrics(struct dst_entry *dst, |
| 127 | const u32 *src_metrics, |
| 128 | bool read_only) |
| 129 | { |
| 130 | dst->_metrics = ((unsigned long) src_metrics) | |
| 131 | (read_only ? DST_METRICS_READ_ONLY : 0); |
| 132 | } |
| 133 | |
| 134 | static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src) |
| 135 | { |
| 136 | u32 *dst_metrics = dst_metrics_write_ptr(dest); |
| 137 | |
| 138 | if (dst_metrics) { |
| 139 | u32 *src_metrics = DST_METRICS_PTR(src); |
| 140 | |
| 141 | memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32)); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | static inline u32 *dst_metrics_ptr(struct dst_entry *dst) |
| 146 | { |
| 147 | return DST_METRICS_PTR(dst); |
| 148 | } |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | static inline u32 |
David S. Miller | 5170ae8 | 2010-12-12 21:35:57 -0800 | [diff] [blame] | 151 | dst_metric_raw(const struct dst_entry *dst, const int metric) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 153 | u32 *p = DST_METRICS_PTR(dst); |
| 154 | |
| 155 | return p[metric-1]; |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 156 | } |
| 157 | |
David S. Miller | 5170ae8 | 2010-12-12 21:35:57 -0800 | [diff] [blame] | 158 | static inline u32 |
| 159 | dst_metric(const struct dst_entry *dst, const int metric) |
| 160 | { |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 161 | WARN_ON_ONCE(metric == RTAX_HOPLIMIT || |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 162 | metric == RTAX_ADVMSS || |
| 163 | metric == RTAX_MTU); |
David S. Miller | 5170ae8 | 2010-12-12 21:35:57 -0800 | [diff] [blame] | 164 | return dst_metric_raw(dst, metric); |
| 165 | } |
| 166 | |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 167 | static inline u32 |
| 168 | dst_metric_advmss(const struct dst_entry *dst) |
| 169 | { |
| 170 | u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS); |
| 171 | |
| 172 | if (!advmss) |
| 173 | advmss = dst->ops->default_advmss(dst); |
| 174 | |
| 175 | return advmss; |
| 176 | } |
| 177 | |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 178 | static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val) |
| 179 | { |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 180 | u32 *p = dst_metrics_write_ptr(dst); |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 181 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 182 | if (p) |
| 183 | p[metric-1] = val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Daniel Borkmann | c3a8d94 | 2015-08-31 15:58:47 +0200 | [diff] [blame] | 186 | /* Kernel-internal feature bits that are unallocated in user space. */ |
Vandana BN | 40f6a2cb | 2019-07-01 17:25:39 +0530 | [diff] [blame] | 187 | #define DST_FEATURE_ECN_CA (1U << 31) |
Daniel Borkmann | c3a8d94 | 2015-08-31 15:58:47 +0200 | [diff] [blame] | 188 | |
| 189 | #define DST_FEATURE_MASK (DST_FEATURE_ECN_CA) |
| 190 | #define DST_FEATURE_ECN_MASK (DST_FEATURE_ECN_CA | RTAX_FEATURE_ECN) |
| 191 | |
Gilad Ben-Yossef | 0c3adfb | 2009-10-28 04:15:23 +0000 | [diff] [blame] | 192 | static inline u32 |
| 193 | dst_feature(const struct dst_entry *dst, u32 feature) |
| 194 | { |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 195 | return dst_metric(dst, RTAX_FEATURES) & feature; |
Gilad Ben-Yossef | 0c3adfb | 2009-10-28 04:15:23 +0000 | [diff] [blame] | 196 | } |
| 197 | |
Brian Vazquez | f67fbea | 2021-02-01 17:41:31 +0000 | [diff] [blame] | 198 | INDIRECT_CALLABLE_DECLARE(unsigned int ip6_mtu(const struct dst_entry *)); |
| 199 | INDIRECT_CALLABLE_DECLARE(unsigned int ipv4_mtu(const struct dst_entry *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | static inline u32 dst_mtu(const struct dst_entry *dst) |
| 201 | { |
Brian Vazquez | f67fbea | 2021-02-01 17:41:31 +0000 | [diff] [blame] | 202 | return INDIRECT_CALL_INET(dst->ops->mtu, ip6_mtu, ipv4_mtu, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | |
Stephen Hemminger | c1e20f7 | 2008-07-18 23:02:15 -0700 | [diff] [blame] | 205 | /* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */ |
| 206 | static inline unsigned long dst_metric_rtt(const struct dst_entry *dst, int metric) |
| 207 | { |
| 208 | return msecs_to_jiffies(dst_metric(dst, metric)); |
| 209 | } |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | static inline u32 |
| 212 | dst_allfrag(const struct dst_entry *dst) |
| 213 | { |
Gilad Ben-Yossef | 0c3adfb | 2009-10-28 04:15:23 +0000 | [diff] [blame] | 214 | int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | return ret; |
| 216 | } |
| 217 | |
| 218 | static inline int |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 219 | dst_metric_locked(const struct dst_entry *dst, int metric) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
Miaohe Lin | 5af6889 | 2020-08-29 05:21:30 -0400 | [diff] [blame] | 221 | return dst_metric(dst, RTAX_LOCK) & (1 << metric); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |
| 223 | |
Eldad Zack | 7f95e18 | 2012-06-16 15:14:49 +0200 | [diff] [blame] | 224 | static inline void dst_hold(struct dst_entry *dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | { |
Eric Dumazet | 5635c10 | 2008-11-16 19:46:36 -0800 | [diff] [blame] | 226 | /* |
| 227 | * If your kernel compilation stops here, please check |
David Miller | 8b207e7 | 2017-11-28 15:40:53 -0500 | [diff] [blame] | 228 | * the placement of __refcnt in struct dst_entry |
Eric Dumazet | 5635c10 | 2008-11-16 19:46:36 -0800 | [diff] [blame] | 229 | */ |
| 230 | BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63); |
Wei Wang | 44ebe79 | 2017-06-17 10:42:44 -0700 | [diff] [blame] | 231 | WARN_ON(atomic_inc_not_zero(&dst->__refcnt) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 234 | static inline void dst_use_noref(struct dst_entry *dst, unsigned long time) |
| 235 | { |
Paolo Abeni | 32d18ab | 2017-10-24 12:41:01 +0200 | [diff] [blame] | 236 | if (unlikely(time != dst->lastuse)) { |
Wei Wang | 0da4af0 | 2017-10-13 15:08:07 -0700 | [diff] [blame] | 237 | dst->__use++; |
| 238 | dst->lastuse = time; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | static inline void dst_hold_and_use(struct dst_entry *dst, unsigned long time) |
| 243 | { |
| 244 | dst_hold(dst); |
| 245 | dst_use_noref(dst, time); |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 246 | } |
| 247 | |
Eldad Zack | 7f95e18 | 2012-06-16 15:14:49 +0200 | [diff] [blame] | 248 | static inline struct dst_entry *dst_clone(struct dst_entry *dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
| 250 | if (dst) |
Eric Dumazet | 222d7dbd | 2017-09-21 09:15:46 -0700 | [diff] [blame] | 251 | dst_hold(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | return dst; |
| 253 | } |
| 254 | |
Joe Perches | a4023dd | 2013-09-20 11:23:21 -0700 | [diff] [blame] | 255 | void dst_release(struct dst_entry *dst); |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 256 | |
Wei Wang | 5f56f40 | 2017-06-17 10:42:27 -0700 | [diff] [blame] | 257 | void dst_release_immediate(struct dst_entry *dst); |
| 258 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 259 | static inline void refdst_drop(unsigned long refdst) |
| 260 | { |
| 261 | if (!(refdst & SKB_DST_NOREF)) |
| 262 | dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK)); |
| 263 | } |
| 264 | |
| 265 | /** |
| 266 | * skb_dst_drop - drops skb dst |
| 267 | * @skb: buffer |
| 268 | * |
| 269 | * Drops dst reference count if a reference was taken. |
| 270 | */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 271 | static inline void skb_dst_drop(struct sk_buff *skb) |
| 272 | { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 273 | if (skb->_skb_refdst) { |
| 274 | refdst_drop(skb->_skb_refdst); |
| 275 | skb->_skb_refdst = 0UL; |
| 276 | } |
| 277 | } |
| 278 | |
Joe Stringer | e79e259 | 2015-08-26 11:31:47 -0700 | [diff] [blame] | 279 | static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst) |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 280 | { |
Paolo Abeni | 8a886b1 | 2021-07-28 18:24:00 +0200 | [diff] [blame] | 281 | nskb->slow_gro |= !!refdst; |
Joe Stringer | e79e259 | 2015-08-26 11:31:47 -0700 | [diff] [blame] | 282 | nskb->_skb_refdst = refdst; |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 283 | if (!(nskb->_skb_refdst & SKB_DST_NOREF)) |
| 284 | dst_clone(skb_dst(nskb)); |
| 285 | } |
| 286 | |
Joe Stringer | e79e259 | 2015-08-26 11:31:47 -0700 | [diff] [blame] | 287 | static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb) |
| 288 | { |
| 289 | __skb_dst_copy(nskb, oskb->_skb_refdst); |
| 290 | } |
| 291 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 292 | /** |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 293 | * dst_hold_safe - Take a reference on a dst if possible |
| 294 | * @dst: pointer to dst entry |
| 295 | * |
| 296 | * This helper returns false if it could not safely |
| 297 | * take a reference on a dst. |
| 298 | */ |
| 299 | static inline bool dst_hold_safe(struct dst_entry *dst) |
| 300 | { |
Wei Wang | b2a9c0e | 2017-06-17 10:42:41 -0700 | [diff] [blame] | 301 | return atomic_inc_not_zero(&dst->__refcnt); |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | /** |
Eric Dumazet | 222d7dbd | 2017-09-21 09:15:46 -0700 | [diff] [blame] | 305 | * skb_dst_force - makes sure skb dst is refcounted |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 306 | * @skb: buffer |
| 307 | * |
| 308 | * If dst is not yet refcounted and not destroyed, grab a ref on it. |
Florian Westphal | b60a773 | 2019-06-26 20:40:45 +0200 | [diff] [blame] | 309 | * Returns true if dst is refcounted. |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 310 | */ |
Florian Westphal | b60a773 | 2019-06-26 20:40:45 +0200 | [diff] [blame] | 311 | static inline bool skb_dst_force(struct sk_buff *skb) |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 312 | { |
| 313 | if (skb_dst_is_noref(skb)) { |
| 314 | struct dst_entry *dst = skb_dst(skb); |
| 315 | |
Eric Dumazet | 222d7dbd | 2017-09-21 09:15:46 -0700 | [diff] [blame] | 316 | WARN_ON(!rcu_read_lock_held()); |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 317 | if (!dst_hold_safe(dst)) |
| 318 | dst = NULL; |
| 319 | |
| 320 | skb->_skb_refdst = (unsigned long)dst; |
Paolo Abeni | 8a886b1 | 2021-07-28 18:24:00 +0200 | [diff] [blame] | 321 | skb->slow_gro |= !!dst; |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 322 | } |
Florian Westphal | b60a773 | 2019-06-26 20:40:45 +0200 | [diff] [blame] | 323 | |
| 324 | return skb->_skb_refdst != 0UL; |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 325 | } |
| 326 | |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 327 | |
| 328 | /** |
Eric Dumazet | 290b895 | 2010-09-27 00:33:35 +0000 | [diff] [blame] | 329 | * __skb_tunnel_rx - prepare skb for rx reinsert |
| 330 | * @skb: buffer |
| 331 | * @dev: tunnel device |
Nicolas Dichtel | ea23192 | 2013-09-02 15:34:58 +0200 | [diff] [blame] | 332 | * @net: netns for packet i/o |
Eric Dumazet | 290b895 | 2010-09-27 00:33:35 +0000 | [diff] [blame] | 333 | * |
| 334 | * After decapsulation, packet is going to re-enter (netif_rx()) our stack, |
| 335 | * so make some cleanups. (no accounting done) |
| 336 | */ |
Nicolas Dichtel | ea23192 | 2013-09-02 15:34:58 +0200 | [diff] [blame] | 337 | static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, |
| 338 | struct net *net) |
Eric Dumazet | 290b895 | 2010-09-27 00:33:35 +0000 | [diff] [blame] | 339 | { |
| 340 | skb->dev = dev; |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 341 | |
| 342 | /* |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 343 | * Clear hash so that we can recalulate the hash for the |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 344 | * encapsulated packet, unless we have already determine the hash |
| 345 | * over the L4 4-tuple. |
| 346 | */ |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 347 | skb_clear_hash_if_not_l4(skb); |
Eric Dumazet | 290b895 | 2010-09-27 00:33:35 +0000 | [diff] [blame] | 348 | skb_set_queue_mapping(skb, 0); |
Nicolas Dichtel | ea23192 | 2013-09-02 15:34:58 +0200 | [diff] [blame] | 349 | skb_scrub_packet(skb, !net_eq(net, dev_net(dev))); |
Eric Dumazet | 290b895 | 2010-09-27 00:33:35 +0000 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | /** |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 353 | * skb_tunnel_rx - prepare skb for rx reinsert |
| 354 | * @skb: buffer |
| 355 | * @dev: tunnel device |
Jonathan Neuschäfer | 8eb1a85 | 2018-03-04 03:29:53 +0100 | [diff] [blame] | 356 | * @net: netns for packet i/o |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 357 | * |
| 358 | * After decapsulation, packet is going to re-enter (netif_rx()) our stack, |
| 359 | * so make some cleanups, and perform accounting. |
Eric Dumazet | 290b895 | 2010-09-27 00:33:35 +0000 | [diff] [blame] | 360 | * Note: this accounting is not SMP safe. |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 361 | */ |
Nicolas Dichtel | ea23192 | 2013-09-02 15:34:58 +0200 | [diff] [blame] | 362 | static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev, |
| 363 | struct net *net) |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 364 | { |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 365 | /* TODO : stats should be SMP safe */ |
| 366 | dev->stats.rx_packets++; |
| 367 | dev->stats.rx_bytes += skb->len; |
Nicolas Dichtel | ea23192 | 2013-09-02 15:34:58 +0200 | [diff] [blame] | 368 | __skb_tunnel_rx(skb, dev, net); |
Eric Dumazet | d19d56d | 2010-05-17 22:36:55 -0700 | [diff] [blame] | 369 | } |
| 370 | |
Daniel Borkmann | 808c1b6 | 2016-03-16 01:42:50 +0100 | [diff] [blame] | 371 | static inline u32 dst_tclassid(const struct sk_buff *skb) |
| 372 | { |
| 373 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 374 | const struct dst_entry *dst; |
| 375 | |
| 376 | dst = skb_dst(skb); |
| 377 | if (dst) |
| 378 | return dst->tclassid; |
| 379 | #endif |
| 380 | return 0; |
| 381 | } |
| 382 | |
Eric W. Biederman | ede2059 | 2015-10-07 16:48:47 -0500 | [diff] [blame] | 383 | int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 384 | static inline int dst_discard(struct sk_buff *skb) |
| 385 | { |
Eric W. Biederman | ede2059 | 2015-10-07 16:48:47 -0500 | [diff] [blame] | 386 | return dst_discard_out(&init_net, skb->sk, skb); |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 387 | } |
Joe Perches | a4023dd | 2013-09-20 11:23:21 -0700 | [diff] [blame] | 388 | void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref, |
| 389 | int initial_obsolete, unsigned short flags); |
Thomas Graf | f38a9eb | 2015-07-21 10:43:56 +0200 | [diff] [blame] | 390 | void dst_init(struct dst_entry *dst, struct dst_ops *ops, |
| 391 | struct net_device *dev, int initial_ref, int initial_obsolete, |
| 392 | unsigned short flags); |
Joe Perches | a4023dd | 2013-09-20 11:23:21 -0700 | [diff] [blame] | 393 | struct dst_entry *dst_destroy(struct dst_entry *dst); |
Wei Wang | 4a6ce2b | 2017-06-17 10:42:28 -0700 | [diff] [blame] | 394 | void dst_dev_put(struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | static inline void dst_confirm(struct dst_entry *dst) |
| 397 | { |
David S. Miller | 5110effe | 2012-07-02 02:21:03 -0700 | [diff] [blame] | 398 | } |
Eric Dumazet | f2c31e3 | 2011-07-29 19:00:53 +0000 | [diff] [blame] | 399 | |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 400 | static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
| 401 | { |
Zhouyi Zhou | aaa0c23 | 2013-03-14 17:21:50 +0000 | [diff] [blame] | 402 | struct neighbour *n = dst->ops->neigh_lookup(dst, NULL, daddr); |
| 403 | return IS_ERR(n) ? NULL : n; |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst, |
| 407 | struct sk_buff *skb) |
| 408 | { |
Guillaume Nault | 0992d67 | 2020-10-31 01:07:25 +0100 | [diff] [blame] | 409 | struct neighbour *n; |
Martin Varghese | 394de11 | 2020-07-05 14:23:49 +0530 | [diff] [blame] | 410 | |
Guillaume Nault | 0992d67 | 2020-10-31 01:07:25 +0100 | [diff] [blame] | 411 | if (WARN_ON_ONCE(!dst->ops->neigh_lookup)) |
| 412 | return NULL; |
| 413 | |
| 414 | n = dst->ops->neigh_lookup(dst, skb, NULL); |
Martin Varghese | 394de11 | 2020-07-05 14:23:49 +0530 | [diff] [blame] | 415 | |
Zhouyi Zhou | aaa0c23 | 2013-03-14 17:21:50 +0000 | [diff] [blame] | 416 | return IS_ERR(n) ? NULL : n; |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Julian Anastasov | 63fca65 | 2017-02-06 23:14:15 +0200 | [diff] [blame] | 419 | static inline void dst_confirm_neigh(const struct dst_entry *dst, |
| 420 | const void *daddr) |
| 421 | { |
| 422 | if (dst->ops->confirm_neigh) |
| 423 | dst->ops->confirm_neigh(dst, daddr); |
| 424 | } |
| 425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | static inline void dst_link_failure(struct sk_buff *skb) |
| 427 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 428 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | if (dst && dst->ops && dst->ops->link_failure) |
| 430 | dst->ops->link_failure(skb); |
| 431 | } |
| 432 | |
| 433 | static inline void dst_set_expires(struct dst_entry *dst, int timeout) |
| 434 | { |
| 435 | unsigned long expires = jiffies + timeout; |
| 436 | |
| 437 | if (expires == 0) |
| 438 | expires = 1; |
| 439 | |
| 440 | if (dst->expires == 0 || time_before(expires, dst->expires)) |
| 441 | dst->expires = expires; |
| 442 | } |
| 443 | |
Brian Vazquez | 6585d7dc | 2021-02-01 17:41:30 +0000 | [diff] [blame] | 444 | INDIRECT_CALLABLE_DECLARE(int ip6_output(struct net *, struct sock *, |
| 445 | struct sk_buff *)); |
| 446 | INDIRECT_CALLABLE_DECLARE(int ip_output(struct net *, struct sock *, |
| 447 | struct sk_buff *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | /* Output packet to network from transport. */ |
Eric W. Biederman | 13206b6 | 2015-10-07 16:48:35 -0500 | [diff] [blame] | 449 | static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 450 | { |
Brian Vazquez | 6585d7dc | 2021-02-01 17:41:30 +0000 | [diff] [blame] | 451 | return INDIRECT_CALL_INET(skb_dst(skb)->output, |
| 452 | ip6_output, ip_output, |
| 453 | net, sk, skb); |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 454 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Brian Vazquez | e43b219 | 2021-02-01 17:41:29 +0000 | [diff] [blame] | 456 | INDIRECT_CALLABLE_DECLARE(int ip6_input(struct sk_buff *)); |
| 457 | INDIRECT_CALLABLE_DECLARE(int ip_local_deliver(struct sk_buff *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | /* Input packet from network to transport. */ |
| 459 | static inline int dst_input(struct sk_buff *skb) |
| 460 | { |
Brian Vazquez | e43b219 | 2021-02-01 17:41:29 +0000 | [diff] [blame] | 461 | return INDIRECT_CALL_INET(skb_dst(skb)->input, |
| 462 | ip6_input, ip_local_deliver, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | } |
| 464 | |
Brian Vazquez | bbd807d | 2021-02-01 17:41:32 +0000 | [diff] [blame] | 465 | INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *, |
| 466 | u32)); |
| 467 | INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *, |
| 468 | u32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie) |
| 470 | { |
| 471 | if (dst->obsolete) |
Brian Vazquez | bbd807d | 2021-02-01 17:41:32 +0000 | [diff] [blame] | 472 | dst = INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, |
| 473 | ipv4_dst_check, dst, cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | return dst; |
| 475 | } |
| 476 | |
Herbert Xu | 815f4e5 | 2007-12-12 10:36:59 -0800 | [diff] [blame] | 477 | /* Flags for xfrm_lookup flags argument. */ |
| 478 | enum { |
David S. Miller | 80c0bc9 | 2011-03-01 14:36:37 -0800 | [diff] [blame] | 479 | XFRM_LOOKUP_ICMP = 1 << 0, |
Steffen Klassert | b8c203b | 2014-09-16 10:08:49 +0200 | [diff] [blame] | 480 | XFRM_LOOKUP_QUEUE = 1 << 1, |
huaibin Wang | ac37e25 | 2015-02-11 18:10:36 +0100 | [diff] [blame] | 481 | XFRM_LOOKUP_KEEP_DST_REF = 1 << 2, |
Herbert Xu | 815f4e5 | 2007-12-12 10:36:59 -0800 | [diff] [blame] | 482 | }; |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | struct flowi; |
| 485 | #ifndef CONFIG_XFRM |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 486 | static inline struct dst_entry *xfrm_lookup(struct net *net, |
| 487 | struct dst_entry *dst_orig, |
Eric Dumazet | 6f9c961 | 2015-09-25 07:39:10 -0700 | [diff] [blame] | 488 | const struct flowi *fl, |
| 489 | const struct sock *sk, |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 490 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | { |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 492 | return dst_orig; |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 493 | } |
| 494 | |
Benedict Wong | bc56b33 | 2018-07-19 10:50:44 -0700 | [diff] [blame] | 495 | static inline struct dst_entry * |
| 496 | xfrm_lookup_with_ifid(struct net *net, struct dst_entry *dst_orig, |
| 497 | const struct flowi *fl, const struct sock *sk, |
| 498 | int flags, u32 if_id) |
| 499 | { |
| 500 | return dst_orig; |
| 501 | } |
| 502 | |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 503 | static inline struct dst_entry *xfrm_lookup_route(struct net *net, |
| 504 | struct dst_entry *dst_orig, |
| 505 | const struct flowi *fl, |
Eric Dumazet | 6f9c961 | 2015-09-25 07:39:10 -0700 | [diff] [blame] | 506 | const struct sock *sk, |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 507 | int flags) |
| 508 | { |
| 509 | return dst_orig; |
| 510 | } |
Vlad Yasevich | e87b399 | 2013-10-15 22:01:29 -0400 | [diff] [blame] | 511 | |
| 512 | static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) |
| 513 | { |
| 514 | return NULL; |
| 515 | } |
| 516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | #else |
Joe Perches | a4023dd | 2013-09-20 11:23:21 -0700 | [diff] [blame] | 518 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
Eric Dumazet | 6f9c961 | 2015-09-25 07:39:10 -0700 | [diff] [blame] | 519 | const struct flowi *fl, const struct sock *sk, |
Joe Perches | a4023dd | 2013-09-20 11:23:21 -0700 | [diff] [blame] | 520 | int flags); |
Vlad Yasevich | e87b399 | 2013-10-15 22:01:29 -0400 | [diff] [blame] | 521 | |
Benedict Wong | bc56b33 | 2018-07-19 10:50:44 -0700 | [diff] [blame] | 522 | struct dst_entry *xfrm_lookup_with_ifid(struct net *net, |
| 523 | struct dst_entry *dst_orig, |
| 524 | const struct flowi *fl, |
| 525 | const struct sock *sk, int flags, |
| 526 | u32 if_id); |
| 527 | |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 528 | struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, |
Eric Dumazet | 6f9c961 | 2015-09-25 07:39:10 -0700 | [diff] [blame] | 529 | const struct flowi *fl, const struct sock *sk, |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 530 | int flags); |
| 531 | |
Vlad Yasevich | e87b399 | 2013-10-15 22:01:29 -0400 | [diff] [blame] | 532 | /* skb attached with this dst needs transformation if dst->xfrm is valid */ |
| 533 | static inline struct xfrm_state *dst_xfrm(const struct dst_entry *dst) |
| 534 | { |
| 535 | return dst->xfrm; |
| 536 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
Nicolas Dichtel | f15ca72 | 2018-01-25 19:03:03 +0100 | [diff] [blame] | 539 | static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu) |
| 540 | { |
| 541 | struct dst_entry *dst = skb_dst(skb); |
| 542 | |
| 543 | if (dst && dst->ops->update_pmtu) |
Hangbin Liu | bd085ef | 2019-12-22 10:51:09 +0800 | [diff] [blame] | 544 | dst->ops->update_pmtu(dst, NULL, skb, mtu, true); |
Nicolas Dichtel | f15ca72 | 2018-01-25 19:03:03 +0100 | [diff] [blame] | 545 | } |
| 546 | |
Hangbin Liu | 07dc35c | 2019-12-22 10:51:12 +0800 | [diff] [blame] | 547 | /* update dst pmtu but not do neighbor confirm */ |
| 548 | static inline void skb_dst_update_pmtu_no_confirm(struct sk_buff *skb, u32 mtu) |
| 549 | { |
| 550 | struct dst_entry *dst = skb_dst(skb); |
| 551 | |
| 552 | if (dst && dst->ops->update_pmtu) |
| 553 | dst->ops->update_pmtu(dst, NULL, skb, mtu, false); |
| 554 | } |
| 555 | |
Daniel Borkmann | c4c877b | 2021-03-10 01:38:09 +0100 | [diff] [blame] | 556 | struct dst_entry *dst_blackhole_check(struct dst_entry *dst, u32 cookie); |
| 557 | void dst_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 558 | struct sk_buff *skb, u32 mtu, bool confirm_neigh); |
| 559 | void dst_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
| 560 | struct sk_buff *skb); |
| 561 | u32 *dst_blackhole_cow_metrics(struct dst_entry *dst, unsigned long old); |
| 562 | struct neighbour *dst_blackhole_neigh_lookup(const struct dst_entry *dst, |
| 563 | struct sk_buff *skb, |
| 564 | const void *daddr); |
| 565 | unsigned int dst_blackhole_mtu(const struct dst_entry *dst); |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | #endif /* _NET_DST_H */ |