David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1 | #include <linux/rcupdate.h> |
| 2 | #include <linux/spinlock.h> |
| 3 | #include <linux/jiffies.h> |
David S. Miller | ab92bb2 | 2012-07-09 16:19:30 -0700 | [diff] [blame] | 4 | #include <linux/module.h> |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 5 | #include <linux/cache.h> |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 6 | #include <linux/slab.h> |
| 7 | #include <linux/init.h> |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 8 | #include <linux/tcp.h> |
Eric Dumazet | 5815d5e | 2012-07-19 23:02:34 +0000 | [diff] [blame] | 9 | #include <linux/hash.h> |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 10 | #include <linux/tcp_metrics.h> |
Eric Dumazet | 976a702 | 2012-11-16 05:31:53 +0000 | [diff] [blame] | 11 | #include <linux/vmalloc.h> |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 12 | |
| 13 | #include <net/inet_connection_sock.h> |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 14 | #include <net/net_namespace.h> |
David S. Miller | ab92bb2 | 2012-07-09 16:19:30 -0700 | [diff] [blame] | 15 | #include <net/request_sock.h> |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 16 | #include <net/inetpeer.h> |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 17 | #include <net/sock.h> |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 18 | #include <net/ipv6.h> |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 19 | #include <net/dst.h> |
| 20 | #include <net/tcp.h> |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 21 | #include <net/genetlink.h> |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 22 | |
| 23 | int sysctl_tcp_nometrics_save __read_mostly; |
| 24 | |
David S. Miller | 4180442 | 2014-01-18 00:55:41 -0800 | [diff] [blame] | 25 | static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr, |
| 26 | const struct inetpeer_addr *daddr, |
Christoph Paasch | 77f99ad | 2014-01-16 20:01:21 +0100 | [diff] [blame] | 27 | struct net *net, unsigned int hash); |
| 28 | |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 29 | struct tcp_fastopen_metrics { |
| 30 | u16 mss; |
Daniel Lee | 2646c83 | 2015-04-06 14:37:27 -0700 | [diff] [blame] | 31 | u16 syn_loss:10, /* Recurring Fast Open SYN losses */ |
| 32 | try_exp:2; /* Request w/ exp. option (once) */ |
Yuchung Cheng | aab4874 | 2012-07-19 06:43:10 +0000 | [diff] [blame] | 33 | unsigned long last_syn_loss; /* Last Fast Open SYN loss */ |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 34 | struct tcp_fastopen_cookie cookie; |
| 35 | }; |
| 36 | |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 37 | /* TCP_METRIC_MAX includes 2 extra fields for userspace compatibility |
| 38 | * Kernel only stores RTT and RTTVAR in usec resolution |
| 39 | */ |
| 40 | #define TCP_METRIC_MAX_KERNEL (TCP_METRIC_MAX - 2) |
| 41 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 42 | struct tcp_metrics_block { |
| 43 | struct tcp_metrics_block __rcu *tcpm_next; |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 44 | possible_net_t tcpm_net; |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 45 | struct inetpeer_addr tcpm_saddr; |
Christoph Paasch | 324fd55 | 2014-01-08 16:05:55 +0100 | [diff] [blame] | 46 | struct inetpeer_addr tcpm_daddr; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 47 | unsigned long tcpm_stamp; |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 48 | u32 tcpm_ts; |
| 49 | u32 tcpm_ts_stamp; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 50 | u32 tcpm_lock; |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 51 | u32 tcpm_vals[TCP_METRIC_MAX_KERNEL + 1]; |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 52 | struct tcp_fastopen_metrics tcpm_fastopen; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 53 | |
| 54 | struct rcu_head rcu_head; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 55 | }; |
| 56 | |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 57 | static inline struct net *tm_net(struct tcp_metrics_block *tm) |
| 58 | { |
| 59 | return read_pnet(&tm->tcpm_net); |
| 60 | } |
| 61 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 62 | static bool tcp_metric_locked(struct tcp_metrics_block *tm, |
| 63 | enum tcp_metric_index idx) |
| 64 | { |
| 65 | return tm->tcpm_lock & (1 << idx); |
| 66 | } |
| 67 | |
| 68 | static u32 tcp_metric_get(struct tcp_metrics_block *tm, |
| 69 | enum tcp_metric_index idx) |
| 70 | { |
| 71 | return tm->tcpm_vals[idx]; |
| 72 | } |
| 73 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 74 | static void tcp_metric_set(struct tcp_metrics_block *tm, |
| 75 | enum tcp_metric_index idx, |
| 76 | u32 val) |
| 77 | { |
| 78 | tm->tcpm_vals[idx] = val; |
| 79 | } |
| 80 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 81 | static bool addr_same(const struct inetpeer_addr *a, |
| 82 | const struct inetpeer_addr *b) |
| 83 | { |
David Ahern | d39d14f | 2015-08-27 16:07:01 -0700 | [diff] [blame] | 84 | return inetpeer_addr_cmp(a, b) == 0; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | struct tcpm_hash_bucket { |
| 88 | struct tcp_metrics_block __rcu *chain; |
| 89 | }; |
| 90 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 91 | static struct tcpm_hash_bucket *tcp_metrics_hash __read_mostly; |
| 92 | static unsigned int tcp_metrics_hash_log __read_mostly; |
| 93 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 94 | static DEFINE_SPINLOCK(tcp_metrics_lock); |
| 95 | |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 96 | static void tcpm_suck_dst(struct tcp_metrics_block *tm, |
| 97 | const struct dst_entry *dst, |
Eric Dumazet | efeaa55 | 2013-05-03 19:12:45 +0000 | [diff] [blame] | 98 | bool fastopen_clear) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 99 | { |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 100 | u32 msval; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 101 | u32 val; |
| 102 | |
Julian Anastasov | 9a0a950 | 2012-07-23 10:46:38 +0300 | [diff] [blame] | 103 | tm->tcpm_stamp = jiffies; |
| 104 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 105 | val = 0; |
| 106 | if (dst_metric_locked(dst, RTAX_RTT)) |
| 107 | val |= 1 << TCP_METRIC_RTT; |
| 108 | if (dst_metric_locked(dst, RTAX_RTTVAR)) |
| 109 | val |= 1 << TCP_METRIC_RTTVAR; |
| 110 | if (dst_metric_locked(dst, RTAX_SSTHRESH)) |
| 111 | val |= 1 << TCP_METRIC_SSTHRESH; |
| 112 | if (dst_metric_locked(dst, RTAX_CWND)) |
| 113 | val |= 1 << TCP_METRIC_CWND; |
| 114 | if (dst_metric_locked(dst, RTAX_REORDERING)) |
| 115 | val |= 1 << TCP_METRIC_REORDERING; |
| 116 | tm->tcpm_lock = val; |
| 117 | |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 118 | msval = dst_metric_raw(dst, RTAX_RTT); |
| 119 | tm->tcpm_vals[TCP_METRIC_RTT] = msval * USEC_PER_MSEC; |
| 120 | |
| 121 | msval = dst_metric_raw(dst, RTAX_RTTVAR); |
| 122 | tm->tcpm_vals[TCP_METRIC_RTTVAR] = msval * USEC_PER_MSEC; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 123 | tm->tcpm_vals[TCP_METRIC_SSTHRESH] = dst_metric_raw(dst, RTAX_SSTHRESH); |
| 124 | tm->tcpm_vals[TCP_METRIC_CWND] = dst_metric_raw(dst, RTAX_CWND); |
| 125 | tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING); |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 126 | tm->tcpm_ts = 0; |
| 127 | tm->tcpm_ts_stamp = 0; |
Eric Dumazet | efeaa55 | 2013-05-03 19:12:45 +0000 | [diff] [blame] | 128 | if (fastopen_clear) { |
| 129 | tm->tcpm_fastopen.mss = 0; |
| 130 | tm->tcpm_fastopen.syn_loss = 0; |
Daniel Lee | 2646c83 | 2015-04-06 14:37:27 -0700 | [diff] [blame] | 131 | tm->tcpm_fastopen.try_exp = 0; |
| 132 | tm->tcpm_fastopen.cookie.exp = false; |
Eric Dumazet | efeaa55 | 2013-05-03 19:12:45 +0000 | [diff] [blame] | 133 | tm->tcpm_fastopen.cookie.len = 0; |
| 134 | } |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 135 | } |
| 136 | |
Christoph Paasch | 77f99ad | 2014-01-16 20:01:21 +0100 | [diff] [blame] | 137 | #define TCP_METRICS_TIMEOUT (60 * 60 * HZ) |
| 138 | |
| 139 | static void tcpm_check_stamp(struct tcp_metrics_block *tm, struct dst_entry *dst) |
| 140 | { |
| 141 | if (tm && unlikely(time_after(jiffies, tm->tcpm_stamp + TCP_METRICS_TIMEOUT))) |
| 142 | tcpm_suck_dst(tm, dst, false); |
| 143 | } |
| 144 | |
| 145 | #define TCP_METRICS_RECLAIM_DEPTH 5 |
| 146 | #define TCP_METRICS_RECLAIM_PTR (struct tcp_metrics_block *) 0x1UL |
| 147 | |
Eric Dumazet | 9f1ab18 | 2015-03-16 07:14:34 -0700 | [diff] [blame] | 148 | #define deref_locked(p) \ |
| 149 | rcu_dereference_protected(p, lockdep_is_held(&tcp_metrics_lock)) |
| 150 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 151 | static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst, |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 152 | struct inetpeer_addr *saddr, |
Christoph Paasch | 324fd55 | 2014-01-08 16:05:55 +0100 | [diff] [blame] | 153 | struct inetpeer_addr *daddr, |
Christoph Paasch | 77f99ad | 2014-01-16 20:01:21 +0100 | [diff] [blame] | 154 | unsigned int hash) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 155 | { |
| 156 | struct tcp_metrics_block *tm; |
| 157 | struct net *net; |
Christoph Paasch | 77f99ad | 2014-01-16 20:01:21 +0100 | [diff] [blame] | 158 | bool reclaim = false; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 159 | |
| 160 | spin_lock_bh(&tcp_metrics_lock); |
| 161 | net = dev_net(dst->dev); |
Christoph Paasch | 77f99ad | 2014-01-16 20:01:21 +0100 | [diff] [blame] | 162 | |
| 163 | /* While waiting for the spin-lock the cache might have been populated |
| 164 | * with this entry and so we have to check again. |
| 165 | */ |
David S. Miller | 4180442 | 2014-01-18 00:55:41 -0800 | [diff] [blame] | 166 | tm = __tcp_get_metrics(saddr, daddr, net, hash); |
Christoph Paasch | 77f99ad | 2014-01-16 20:01:21 +0100 | [diff] [blame] | 167 | if (tm == TCP_METRICS_RECLAIM_PTR) { |
| 168 | reclaim = true; |
| 169 | tm = NULL; |
| 170 | } |
| 171 | if (tm) { |
| 172 | tcpm_check_stamp(tm, dst); |
| 173 | goto out_unlock; |
| 174 | } |
| 175 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 176 | if (unlikely(reclaim)) { |
| 177 | struct tcp_metrics_block *oldest; |
| 178 | |
Eric Dumazet | 9f1ab18 | 2015-03-16 07:14:34 -0700 | [diff] [blame] | 179 | oldest = deref_locked(tcp_metrics_hash[hash].chain); |
| 180 | for (tm = deref_locked(oldest->tcpm_next); tm; |
| 181 | tm = deref_locked(tm->tcpm_next)) { |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 182 | if (time_before(tm->tcpm_stamp, oldest->tcpm_stamp)) |
| 183 | oldest = tm; |
| 184 | } |
| 185 | tm = oldest; |
| 186 | } else { |
| 187 | tm = kmalloc(sizeof(*tm), GFP_ATOMIC); |
| 188 | if (!tm) |
| 189 | goto out_unlock; |
| 190 | } |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 191 | write_pnet(&tm->tcpm_net, net); |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 192 | tm->tcpm_saddr = *saddr; |
Christoph Paasch | 324fd55 | 2014-01-08 16:05:55 +0100 | [diff] [blame] | 193 | tm->tcpm_daddr = *daddr; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 194 | |
Eric Dumazet | efeaa55 | 2013-05-03 19:12:45 +0000 | [diff] [blame] | 195 | tcpm_suck_dst(tm, dst, true); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 196 | |
| 197 | if (likely(!reclaim)) { |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 198 | tm->tcpm_next = tcp_metrics_hash[hash].chain; |
| 199 | rcu_assign_pointer(tcp_metrics_hash[hash].chain, tm); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | out_unlock: |
| 203 | spin_unlock_bh(&tcp_metrics_lock); |
| 204 | return tm; |
| 205 | } |
| 206 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 207 | static struct tcp_metrics_block *tcp_get_encode(struct tcp_metrics_block *tm, int depth) |
| 208 | { |
| 209 | if (tm) |
| 210 | return tm; |
| 211 | if (depth > TCP_METRICS_RECLAIM_DEPTH) |
| 212 | return TCP_METRICS_RECLAIM_PTR; |
| 213 | return NULL; |
| 214 | } |
| 215 | |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 216 | static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr, |
| 217 | const struct inetpeer_addr *daddr, |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 218 | struct net *net, unsigned int hash) |
| 219 | { |
| 220 | struct tcp_metrics_block *tm; |
| 221 | int depth = 0; |
| 222 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 223 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 224 | tm = rcu_dereference(tm->tcpm_next)) { |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 225 | if (addr_same(&tm->tcpm_saddr, saddr) && |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 226 | addr_same(&tm->tcpm_daddr, daddr) && |
| 227 | net_eq(tm_net(tm), net)) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 228 | break; |
| 229 | depth++; |
| 230 | } |
| 231 | return tcp_get_encode(tm, depth); |
| 232 | } |
| 233 | |
| 234 | static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req, |
| 235 | struct dst_entry *dst) |
| 236 | { |
| 237 | struct tcp_metrics_block *tm; |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 238 | struct inetpeer_addr saddr, daddr; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 239 | unsigned int hash; |
| 240 | struct net *net; |
| 241 | |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 242 | saddr.family = req->rsk_ops->family; |
Christoph Paasch | 324fd55 | 2014-01-08 16:05:55 +0100 | [diff] [blame] | 243 | daddr.family = req->rsk_ops->family; |
| 244 | switch (daddr.family) { |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 245 | case AF_INET: |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 246 | inetpeer_set_addr_v4(&saddr, inet_rsk(req)->ir_loc_addr); |
| 247 | inetpeer_set_addr_v4(&daddr, inet_rsk(req)->ir_rmt_addr); |
David Ahern | 72afa35 | 2015-08-27 16:06:59 -0700 | [diff] [blame] | 248 | hash = ipv4_addr_hash(inet_rsk(req)->ir_rmt_addr); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 249 | break; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 250 | #if IS_ENABLED(CONFIG_IPV6) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 251 | case AF_INET6: |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 252 | inetpeer_set_addr_v6(&saddr, &inet_rsk(req)->ir_v6_loc_addr); |
| 253 | inetpeer_set_addr_v6(&daddr, &inet_rsk(req)->ir_v6_rmt_addr); |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 254 | hash = ipv6_addr_hash(&inet_rsk(req)->ir_v6_rmt_addr); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 255 | break; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 256 | #endif |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 257 | default: |
| 258 | return NULL; |
| 259 | } |
| 260 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 261 | net = dev_net(dst->dev); |
Eric W. Biederman | 3e5da62 | 2015-03-13 00:05:24 -0500 | [diff] [blame] | 262 | hash ^= net_hash_mix(net); |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 263 | hash = hash_32(hash, tcp_metrics_hash_log); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 264 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 265 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 266 | tm = rcu_dereference(tm->tcpm_next)) { |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 267 | if (addr_same(&tm->tcpm_saddr, &saddr) && |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 268 | addr_same(&tm->tcpm_daddr, &daddr) && |
| 269 | net_eq(tm_net(tm), net)) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 270 | break; |
| 271 | } |
| 272 | tcpm_check_stamp(tm, dst); |
| 273 | return tm; |
| 274 | } |
| 275 | |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 276 | static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock *tw) |
| 277 | { |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 278 | struct tcp_metrics_block *tm; |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 279 | struct inetpeer_addr saddr, daddr; |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 280 | unsigned int hash; |
| 281 | struct net *net; |
| 282 | |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 283 | if (tw->tw_family == AF_INET) { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 284 | inetpeer_set_addr_v4(&saddr, tw->tw_rcv_saddr); |
| 285 | inetpeer_set_addr_v4(&daddr, tw->tw_daddr); |
David Ahern | 72afa35 | 2015-08-27 16:06:59 -0700 | [diff] [blame] | 286 | hash = ipv4_addr_hash(tw->tw_daddr); |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 287 | } |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 288 | #if IS_ENABLED(CONFIG_IPV6) |
| 289 | else if (tw->tw_family == AF_INET6) { |
| 290 | if (ipv6_addr_v4mapped(&tw->tw_v6_daddr)) { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 291 | inetpeer_set_addr_v4(&saddr, tw->tw_rcv_saddr); |
| 292 | inetpeer_set_addr_v4(&daddr, tw->tw_daddr); |
David Ahern | 72afa35 | 2015-08-27 16:06:59 -0700 | [diff] [blame] | 293 | hash = ipv4_addr_hash(tw->tw_daddr); |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 294 | } else { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 295 | inetpeer_set_addr_v6(&saddr, &tw->tw_v6_rcv_saddr); |
| 296 | inetpeer_set_addr_v6(&daddr, &tw->tw_v6_daddr); |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 297 | hash = ipv6_addr_hash(&tw->tw_v6_daddr); |
| 298 | } |
| 299 | } |
| 300 | #endif |
| 301 | else |
| 302 | return NULL; |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 303 | |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 304 | net = twsk_net(tw); |
Eric W. Biederman | 3e5da62 | 2015-03-13 00:05:24 -0500 | [diff] [blame] | 305 | hash ^= net_hash_mix(net); |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 306 | hash = hash_32(hash, tcp_metrics_hash_log); |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 307 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 308 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 309 | tm = rcu_dereference(tm->tcpm_next)) { |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 310 | if (addr_same(&tm->tcpm_saddr, &saddr) && |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 311 | addr_same(&tm->tcpm_daddr, &daddr) && |
| 312 | net_eq(tm_net(tm), net)) |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 313 | break; |
| 314 | } |
| 315 | return tm; |
| 316 | } |
| 317 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 318 | static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk, |
| 319 | struct dst_entry *dst, |
| 320 | bool create) |
| 321 | { |
| 322 | struct tcp_metrics_block *tm; |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 323 | struct inetpeer_addr saddr, daddr; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 324 | unsigned int hash; |
| 325 | struct net *net; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 326 | |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 327 | if (sk->sk_family == AF_INET) { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 328 | inetpeer_set_addr_v4(&saddr, inet_sk(sk)->inet_saddr); |
| 329 | inetpeer_set_addr_v4(&daddr, inet_sk(sk)->inet_daddr); |
David Ahern | 72afa35 | 2015-08-27 16:06:59 -0700 | [diff] [blame] | 330 | hash = ipv4_addr_hash(inet_sk(sk)->inet_daddr); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 331 | } |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 332 | #if IS_ENABLED(CONFIG_IPV6) |
| 333 | else if (sk->sk_family == AF_INET6) { |
| 334 | if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 335 | inetpeer_set_addr_v4(&saddr, inet_sk(sk)->inet_saddr); |
| 336 | inetpeer_set_addr_v4(&daddr, inet_sk(sk)->inet_daddr); |
David Ahern | 72afa35 | 2015-08-27 16:06:59 -0700 | [diff] [blame] | 337 | hash = ipv4_addr_hash(inet_sk(sk)->inet_daddr); |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 338 | } else { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 339 | inetpeer_set_addr_v6(&saddr, &sk->sk_v6_rcv_saddr); |
| 340 | inetpeer_set_addr_v6(&daddr, &sk->sk_v6_daddr); |
Christoph Paasch | 3ad88cf | 2014-01-22 13:58:44 +0100 | [diff] [blame] | 341 | hash = ipv6_addr_hash(&sk->sk_v6_daddr); |
| 342 | } |
| 343 | } |
| 344 | #endif |
| 345 | else |
| 346 | return NULL; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 347 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 348 | net = dev_net(dst->dev); |
Eric W. Biederman | 3e5da62 | 2015-03-13 00:05:24 -0500 | [diff] [blame] | 349 | hash ^= net_hash_mix(net); |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 350 | hash = hash_32(hash, tcp_metrics_hash_log); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 351 | |
Christoph Paasch | a544302 | 2014-01-08 16:05:56 +0100 | [diff] [blame] | 352 | tm = __tcp_get_metrics(&saddr, &daddr, net, hash); |
Christoph Paasch | 77f99ad | 2014-01-16 20:01:21 +0100 | [diff] [blame] | 353 | if (tm == TCP_METRICS_RECLAIM_PTR) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 354 | tm = NULL; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 355 | if (!tm && create) |
David S. Miller | 4180442 | 2014-01-18 00:55:41 -0800 | [diff] [blame] | 356 | tm = tcpm_new(dst, &saddr, &daddr, hash); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 357 | else |
| 358 | tcpm_check_stamp(tm, dst); |
| 359 | |
| 360 | return tm; |
| 361 | } |
| 362 | |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 363 | /* Save metrics learned by this TCP session. This function is called |
| 364 | * only, when TCP finishes successfully i.e. when it enters TIME-WAIT |
| 365 | * or goes from LAST-ACK to CLOSE. |
| 366 | */ |
| 367 | void tcp_update_metrics(struct sock *sk) |
| 368 | { |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 369 | const struct inet_connection_sock *icsk = inet_csk(sk); |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 370 | struct dst_entry *dst = __sk_dst_get(sk); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 371 | struct tcp_sock *tp = tcp_sk(sk); |
Nikolay Borisov | 1043e25 | 2016-02-03 09:46:52 +0200 | [diff] [blame] | 372 | struct net *net = sock_net(sk); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 373 | struct tcp_metrics_block *tm; |
| 374 | unsigned long rtt; |
| 375 | u32 val; |
| 376 | int m; |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 377 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 378 | if (sysctl_tcp_nometrics_save || !dst) |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 379 | return; |
| 380 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 381 | if (dst->flags & DST_HOST) |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 382 | dst_confirm(dst); |
| 383 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 384 | rcu_read_lock(); |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 385 | if (icsk->icsk_backoff || !tp->srtt_us) { |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 386 | /* This session failed to estimate rtt. Why? |
| 387 | * Probably, no packets returned in time. Reset our |
| 388 | * results. |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 389 | */ |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 390 | tm = tcp_get_metrics(sk, dst, false); |
| 391 | if (tm && !tcp_metric_locked(tm, TCP_METRIC_RTT)) |
| 392 | tcp_metric_set(tm, TCP_METRIC_RTT, 0); |
| 393 | goto out_unlock; |
| 394 | } else |
| 395 | tm = tcp_get_metrics(sk, dst, true); |
| 396 | |
| 397 | if (!tm) |
| 398 | goto out_unlock; |
| 399 | |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 400 | rtt = tcp_metric_get(tm, TCP_METRIC_RTT); |
| 401 | m = rtt - tp->srtt_us; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 402 | |
| 403 | /* If newly calculated rtt larger than stored one, store new |
| 404 | * one. Otherwise, use EWMA. Remember, rtt overestimation is |
| 405 | * always better than underestimation. |
| 406 | */ |
| 407 | if (!tcp_metric_locked(tm, TCP_METRIC_RTT)) { |
| 408 | if (m <= 0) |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 409 | rtt = tp->srtt_us; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 410 | else |
| 411 | rtt -= (m >> 3); |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 412 | tcp_metric_set(tm, TCP_METRIC_RTT, rtt); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | if (!tcp_metric_locked(tm, TCP_METRIC_RTTVAR)) { |
| 416 | unsigned long var; |
| 417 | |
| 418 | if (m < 0) |
| 419 | m = -m; |
| 420 | |
| 421 | /* Scale deviation to rttvar fixed point */ |
| 422 | m >>= 1; |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 423 | if (m < tp->mdev_us) |
| 424 | m = tp->mdev_us; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 425 | |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 426 | var = tcp_metric_get(tm, TCP_METRIC_RTTVAR); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 427 | if (m >= var) |
| 428 | var = m; |
| 429 | else |
| 430 | var -= (var - m) >> 2; |
| 431 | |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 432 | tcp_metric_set(tm, TCP_METRIC_RTTVAR, var); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | if (tcp_in_initial_slowstart(tp)) { |
| 436 | /* Slow start still did not finish. */ |
| 437 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { |
| 438 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); |
| 439 | if (val && (tp->snd_cwnd >> 1) > val) |
| 440 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, |
| 441 | tp->snd_cwnd >> 1); |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 442 | } |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 443 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { |
| 444 | val = tcp_metric_get(tm, TCP_METRIC_CWND); |
| 445 | if (tp->snd_cwnd > val) |
| 446 | tcp_metric_set(tm, TCP_METRIC_CWND, |
| 447 | tp->snd_cwnd); |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 448 | } |
Yuchung Cheng | 071d508 | 2015-07-09 13:16:29 -0700 | [diff] [blame] | 449 | } else if (!tcp_in_slow_start(tp) && |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 450 | icsk->icsk_ca_state == TCP_CA_Open) { |
| 451 | /* Cong. avoidance phase, cwnd is reliable. */ |
| 452 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) |
| 453 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, |
| 454 | max(tp->snd_cwnd >> 1, tp->snd_ssthresh)); |
| 455 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { |
| 456 | val = tcp_metric_get(tm, TCP_METRIC_CWND); |
Alexander Duyck | 2100844 | 2012-07-11 17:18:04 -0700 | [diff] [blame] | 457 | tcp_metric_set(tm, TCP_METRIC_CWND, (val + tp->snd_cwnd) >> 1); |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 458 | } |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 459 | } else { |
| 460 | /* Else slow start did not finish, cwnd is non-sense, |
| 461 | * ssthresh may be also invalid. |
| 462 | */ |
| 463 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { |
| 464 | val = tcp_metric_get(tm, TCP_METRIC_CWND); |
| 465 | tcp_metric_set(tm, TCP_METRIC_CWND, |
| 466 | (val + tp->snd_ssthresh) >> 1); |
| 467 | } |
| 468 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { |
| 469 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); |
| 470 | if (val && tp->snd_ssthresh > val) |
| 471 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, |
| 472 | tp->snd_ssthresh); |
| 473 | } |
| 474 | if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) { |
| 475 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); |
| 476 | if (val < tp->reordering && |
Nikolay Borisov | 1043e25 | 2016-02-03 09:46:52 +0200 | [diff] [blame] | 477 | tp->reordering != net->ipv4.sysctl_tcp_reordering) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 478 | tcp_metric_set(tm, TCP_METRIC_REORDERING, |
| 479 | tp->reordering); |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 480 | } |
| 481 | } |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 482 | tm->tcpm_stamp = jiffies; |
| 483 | out_unlock: |
| 484 | rcu_read_unlock(); |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | /* Initialize metrics on socket. */ |
| 488 | |
| 489 | void tcp_init_metrics(struct sock *sk) |
| 490 | { |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 491 | struct dst_entry *dst = __sk_dst_get(sk); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 492 | struct tcp_sock *tp = tcp_sk(sk); |
| 493 | struct tcp_metrics_block *tm; |
Yuchung Cheng | 1b7fdd2 | 2013-08-30 08:35:53 -0700 | [diff] [blame] | 494 | u32 val, crtt = 0; /* cached RTT scaled by 8 */ |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 495 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 496 | if (!dst) |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 497 | goto reset; |
| 498 | |
| 499 | dst_confirm(dst); |
| 500 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 501 | rcu_read_lock(); |
| 502 | tm = tcp_get_metrics(sk, dst, true); |
| 503 | if (!tm) { |
| 504 | rcu_read_unlock(); |
| 505 | goto reset; |
| 506 | } |
| 507 | |
| 508 | if (tcp_metric_locked(tm, TCP_METRIC_CWND)) |
| 509 | tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND); |
| 510 | |
| 511 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); |
| 512 | if (val) { |
| 513 | tp->snd_ssthresh = val; |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 514 | if (tp->snd_ssthresh > tp->snd_cwnd_clamp) |
| 515 | tp->snd_ssthresh = tp->snd_cwnd_clamp; |
| 516 | } else { |
| 517 | /* ssthresh may have been reduced unnecessarily during. |
| 518 | * 3WHS. Restore it back to its initial default. |
| 519 | */ |
| 520 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
| 521 | } |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 522 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); |
| 523 | if (val && tp->reordering != val) { |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 524 | tcp_disable_fack(tp); |
| 525 | tcp_disable_early_retrans(tp); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 526 | tp->reordering = val; |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 527 | } |
| 528 | |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 529 | crtt = tcp_metric_get(tm, TCP_METRIC_RTT); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 530 | rcu_read_unlock(); |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 531 | reset: |
Yuchung Cheng | 52f20e6 | 2013-09-03 14:14:35 -0700 | [diff] [blame] | 532 | /* The initial RTT measurement from the SYN/SYN-ACK is not ideal |
| 533 | * to seed the RTO for later data packets because SYN packets are |
| 534 | * small. Use the per-dst cached values to seed the RTO but keep |
| 535 | * the RTT estimator variables intact (e.g., srtt, mdev, rttvar). |
| 536 | * Later the RTO will be updated immediately upon obtaining the first |
| 537 | * data RTT sample (tcp_rtt_estimator()). Hence the cached RTT only |
| 538 | * influences the first RTO but not later RTT estimation. |
| 539 | * |
| 540 | * But if RTT is not available from the SYN (due to retransmits or |
| 541 | * syn cookies) or the cache, force a conservative 3secs timeout. |
| 542 | * |
| 543 | * A bit of theory. RTT is time passed after "normal" sized packet |
| 544 | * is sent until it is ACKed. In normal circumstances sending small |
| 545 | * packets force peer to delay ACKs and calculation is correct too. |
| 546 | * The algorithm is adaptive and, provided we follow specs, it |
| 547 | * NEVER underestimate RTT. BUT! If peer tries to make some clever |
| 548 | * tricks sort of "quick acks" for time long enough to decrease RTT |
| 549 | * to low value, and then abruptly stops to do it and starts to delay |
| 550 | * ACKs, wait for troubles. |
| 551 | */ |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 552 | if (crtt > tp->srtt_us) { |
Neal Cardwell | 269aa75 | 2013-09-16 21:44:20 -0400 | [diff] [blame] | 553 | /* Set RTO like tcp_rtt_estimator(), but from cached RTT. */ |
Konstantin Khlebnikov | 9bdfb3b | 2016-02-21 10:12:39 +0300 | [diff] [blame] | 554 | crtt /= 8 * USEC_PER_SEC / HZ; |
Neal Cardwell | 269aa75 | 2013-09-16 21:44:20 -0400 | [diff] [blame] | 555 | inet_csk(sk)->icsk_rto = crtt + max(2 * crtt, tcp_rto_min(sk)); |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 556 | } else if (tp->srtt_us == 0) { |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 557 | /* RFC6298: 5.7 We've failed to get a valid RTT sample from |
| 558 | * 3WHS. This is most likely due to retransmission, |
| 559 | * including spurious one. Reset the RTO back to 3secs |
| 560 | * from the more aggressive 1sec to avoid more spurious |
| 561 | * retransmission. |
| 562 | */ |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 563 | tp->rttvar_us = jiffies_to_usecs(TCP_TIMEOUT_FALLBACK); |
| 564 | tp->mdev_us = tp->mdev_max_us = tp->rttvar_us; |
| 565 | |
David S. Miller | 4aabd8e | 2012-07-09 16:07:30 -0700 | [diff] [blame] | 566 | inet_csk(sk)->icsk_rto = TCP_TIMEOUT_FALLBACK; |
| 567 | } |
| 568 | /* Cut cwnd down to 1 per RFC5681 if SYN or SYN-ACK has been |
| 569 | * retransmitted. In light of RFC6298 more aggressive 1sec |
| 570 | * initRTO, we only reset cwnd when more than 1 SYN/SYN-ACK |
| 571 | * retransmission has occurred. |
| 572 | */ |
| 573 | if (tp->total_retrans > 1) |
| 574 | tp->snd_cwnd = 1; |
| 575 | else |
| 576 | tp->snd_cwnd = tcp_init_cwnd(tp, dst); |
| 577 | tp->snd_cwnd_stamp = tcp_time_stamp; |
| 578 | } |
David S. Miller | ab92bb2 | 2012-07-09 16:19:30 -0700 | [diff] [blame] | 579 | |
Hannes Frederic Sowa | a26552a | 2014-08-14 22:06:12 +0200 | [diff] [blame] | 580 | bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst, |
| 581 | bool paws_check, bool timestamps) |
David S. Miller | ab92bb2 | 2012-07-09 16:19:30 -0700 | [diff] [blame] | 582 | { |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 583 | struct tcp_metrics_block *tm; |
| 584 | bool ret; |
| 585 | |
David S. Miller | ab92bb2 | 2012-07-09 16:19:30 -0700 | [diff] [blame] | 586 | if (!dst) |
| 587 | return false; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 588 | |
| 589 | rcu_read_lock(); |
| 590 | tm = __tcp_get_metrics_req(req, dst); |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 591 | if (paws_check) { |
| 592 | if (tm && |
| 593 | (u32)get_seconds() - tm->tcpm_ts_stamp < TCP_PAWS_MSL && |
Hannes Frederic Sowa | a26552a | 2014-08-14 22:06:12 +0200 | [diff] [blame] | 594 | ((s32)(tm->tcpm_ts - req->ts_recent) > TCP_PAWS_WINDOW || |
| 595 | !timestamps)) |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 596 | ret = false; |
| 597 | else |
| 598 | ret = true; |
| 599 | } else { |
| 600 | if (tm && tcp_metric_get(tm, TCP_METRIC_RTT) && tm->tcpm_ts_stamp) |
| 601 | ret = true; |
| 602 | else |
| 603 | ret = false; |
| 604 | } |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 605 | rcu_read_unlock(); |
| 606 | |
| 607 | return ret; |
David S. Miller | ab92bb2 | 2012-07-09 16:19:30 -0700 | [diff] [blame] | 608 | } |
| 609 | EXPORT_SYMBOL_GPL(tcp_peer_is_proven); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 610 | |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 611 | void tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst) |
| 612 | { |
| 613 | struct tcp_metrics_block *tm; |
| 614 | |
| 615 | rcu_read_lock(); |
| 616 | tm = tcp_get_metrics(sk, dst, true); |
| 617 | if (tm) { |
| 618 | struct tcp_sock *tp = tcp_sk(sk); |
| 619 | |
| 620 | if ((u32)get_seconds() - tm->tcpm_ts_stamp <= TCP_PAWS_MSL) { |
| 621 | tp->rx_opt.ts_recent_stamp = tm->tcpm_ts_stamp; |
| 622 | tp->rx_opt.ts_recent = tm->tcpm_ts; |
| 623 | } |
| 624 | } |
| 625 | rcu_read_unlock(); |
| 626 | } |
| 627 | EXPORT_SYMBOL_GPL(tcp_fetch_timewait_stamp); |
| 628 | |
| 629 | /* VJ's idea. Save last timestamp seen from this destination and hold |
| 630 | * it at least for normal timewait interval to use for duplicate |
| 631 | * segment detection in subsequent connections, before they enter |
| 632 | * synchronized state. |
| 633 | */ |
| 634 | bool tcp_remember_stamp(struct sock *sk) |
| 635 | { |
| 636 | struct dst_entry *dst = __sk_dst_get(sk); |
| 637 | bool ret = false; |
| 638 | |
| 639 | if (dst) { |
| 640 | struct tcp_metrics_block *tm; |
| 641 | |
| 642 | rcu_read_lock(); |
| 643 | tm = tcp_get_metrics(sk, dst, true); |
| 644 | if (tm) { |
| 645 | struct tcp_sock *tp = tcp_sk(sk); |
| 646 | |
| 647 | if ((s32)(tm->tcpm_ts - tp->rx_opt.ts_recent) <= 0 || |
| 648 | ((u32)get_seconds() - tm->tcpm_ts_stamp > TCP_PAWS_MSL && |
| 649 | tm->tcpm_ts_stamp <= (u32)tp->rx_opt.ts_recent_stamp)) { |
| 650 | tm->tcpm_ts_stamp = (u32)tp->rx_opt.ts_recent_stamp; |
| 651 | tm->tcpm_ts = tp->rx_opt.ts_recent; |
| 652 | } |
| 653 | ret = true; |
| 654 | } |
| 655 | rcu_read_unlock(); |
| 656 | } |
| 657 | return ret; |
| 658 | } |
| 659 | |
| 660 | bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw) |
| 661 | { |
| 662 | struct tcp_metrics_block *tm; |
| 663 | bool ret = false; |
| 664 | |
| 665 | rcu_read_lock(); |
| 666 | tm = __tcp_get_metrics_tw(tw); |
Julian Anastasov | 9a0a950 | 2012-07-23 10:46:38 +0300 | [diff] [blame] | 667 | if (tm) { |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 668 | const struct tcp_timewait_sock *tcptw; |
| 669 | struct sock *sk = (struct sock *) tw; |
| 670 | |
| 671 | tcptw = tcp_twsk(sk); |
| 672 | if ((s32)(tm->tcpm_ts - tcptw->tw_ts_recent) <= 0 || |
| 673 | ((u32)get_seconds() - tm->tcpm_ts_stamp > TCP_PAWS_MSL && |
| 674 | tm->tcpm_ts_stamp <= (u32)tcptw->tw_ts_recent_stamp)) { |
| 675 | tm->tcpm_ts_stamp = (u32)tcptw->tw_ts_recent_stamp; |
| 676 | tm->tcpm_ts = tcptw->tw_ts_recent; |
| 677 | } |
| 678 | ret = true; |
| 679 | } |
| 680 | rcu_read_unlock(); |
| 681 | |
| 682 | return ret; |
| 683 | } |
| 684 | |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 685 | static DEFINE_SEQLOCK(fastopen_seqlock); |
| 686 | |
| 687 | void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, |
Yuchung Cheng | aab4874 | 2012-07-19 06:43:10 +0000 | [diff] [blame] | 688 | struct tcp_fastopen_cookie *cookie, |
| 689 | int *syn_loss, unsigned long *last_syn_loss) |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 690 | { |
| 691 | struct tcp_metrics_block *tm; |
| 692 | |
| 693 | rcu_read_lock(); |
| 694 | tm = tcp_get_metrics(sk, __sk_dst_get(sk), false); |
| 695 | if (tm) { |
| 696 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; |
| 697 | unsigned int seq; |
| 698 | |
| 699 | do { |
| 700 | seq = read_seqbegin(&fastopen_seqlock); |
| 701 | if (tfom->mss) |
| 702 | *mss = tfom->mss; |
| 703 | *cookie = tfom->cookie; |
Daniel Lee | 2646c83 | 2015-04-06 14:37:27 -0700 | [diff] [blame] | 704 | if (cookie->len <= 0 && tfom->try_exp == 1) |
| 705 | cookie->exp = true; |
Yuchung Cheng | aab4874 | 2012-07-19 06:43:10 +0000 | [diff] [blame] | 706 | *syn_loss = tfom->syn_loss; |
| 707 | *last_syn_loss = *syn_loss ? tfom->last_syn_loss : 0; |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 708 | } while (read_seqretry(&fastopen_seqlock, seq)); |
| 709 | } |
| 710 | rcu_read_unlock(); |
| 711 | } |
| 712 | |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 713 | void tcp_fastopen_cache_set(struct sock *sk, u16 mss, |
Daniel Lee | 2646c83 | 2015-04-06 14:37:27 -0700 | [diff] [blame] | 714 | struct tcp_fastopen_cookie *cookie, bool syn_lost, |
| 715 | u16 try_exp) |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 716 | { |
Eric Dumazet | dccf76c | 2013-11-13 15:00:46 -0800 | [diff] [blame] | 717 | struct dst_entry *dst = __sk_dst_get(sk); |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 718 | struct tcp_metrics_block *tm; |
| 719 | |
Eric Dumazet | dccf76c | 2013-11-13 15:00:46 -0800 | [diff] [blame] | 720 | if (!dst) |
| 721 | return; |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 722 | rcu_read_lock(); |
Eric Dumazet | dccf76c | 2013-11-13 15:00:46 -0800 | [diff] [blame] | 723 | tm = tcp_get_metrics(sk, dst, true); |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 724 | if (tm) { |
| 725 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; |
| 726 | |
| 727 | write_seqlock_bh(&fastopen_seqlock); |
Yuchung Cheng | c968601 | 2013-10-29 10:09:05 -0700 | [diff] [blame] | 728 | if (mss) |
| 729 | tfom->mss = mss; |
| 730 | if (cookie && cookie->len > 0) |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 731 | tfom->cookie = *cookie; |
Daniel Lee | 2646c83 | 2015-04-06 14:37:27 -0700 | [diff] [blame] | 732 | else if (try_exp > tfom->try_exp && |
| 733 | tfom->cookie.len <= 0 && !tfom->cookie.exp) |
| 734 | tfom->try_exp = try_exp; |
Yuchung Cheng | aab4874 | 2012-07-19 06:43:10 +0000 | [diff] [blame] | 735 | if (syn_lost) { |
| 736 | ++tfom->syn_loss; |
| 737 | tfom->last_syn_loss = jiffies; |
| 738 | } else |
| 739 | tfom->syn_loss = 0; |
Yuchung Cheng | 1fe4c48 | 2012-07-19 06:43:06 +0000 | [diff] [blame] | 740 | write_sequnlock_bh(&fastopen_seqlock); |
| 741 | } |
| 742 | rcu_read_unlock(); |
| 743 | } |
| 744 | |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 745 | static struct genl_family tcp_metrics_nl_family = { |
| 746 | .id = GENL_ID_GENERATE, |
| 747 | .hdrsize = 0, |
| 748 | .name = TCP_METRICS_GENL_NAME, |
| 749 | .version = TCP_METRICS_GENL_VERSION, |
| 750 | .maxattr = TCP_METRICS_ATTR_MAX, |
| 751 | .netnsok = true, |
| 752 | }; |
| 753 | |
| 754 | static struct nla_policy tcp_metrics_nl_policy[TCP_METRICS_ATTR_MAX + 1] = { |
| 755 | [TCP_METRICS_ATTR_ADDR_IPV4] = { .type = NLA_U32, }, |
| 756 | [TCP_METRICS_ATTR_ADDR_IPV6] = { .type = NLA_BINARY, |
| 757 | .len = sizeof(struct in6_addr), }, |
| 758 | /* Following attributes are not received for GET/DEL, |
| 759 | * we keep them for reference |
| 760 | */ |
| 761 | #if 0 |
| 762 | [TCP_METRICS_ATTR_AGE] = { .type = NLA_MSECS, }, |
| 763 | [TCP_METRICS_ATTR_TW_TSVAL] = { .type = NLA_U32, }, |
| 764 | [TCP_METRICS_ATTR_TW_TS_STAMP] = { .type = NLA_S32, }, |
| 765 | [TCP_METRICS_ATTR_VALS] = { .type = NLA_NESTED, }, |
| 766 | [TCP_METRICS_ATTR_FOPEN_MSS] = { .type = NLA_U16, }, |
| 767 | [TCP_METRICS_ATTR_FOPEN_SYN_DROPS] = { .type = NLA_U16, }, |
| 768 | [TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS] = { .type = NLA_MSECS, }, |
| 769 | [TCP_METRICS_ATTR_FOPEN_COOKIE] = { .type = NLA_BINARY, |
| 770 | .len = TCP_FASTOPEN_COOKIE_MAX, }, |
| 771 | #endif |
| 772 | }; |
| 773 | |
| 774 | /* Add attributes, caller cancels its header on failure */ |
| 775 | static int tcp_metrics_fill_info(struct sk_buff *msg, |
| 776 | struct tcp_metrics_block *tm) |
| 777 | { |
| 778 | struct nlattr *nest; |
| 779 | int i; |
| 780 | |
Christoph Paasch | 324fd55 | 2014-01-08 16:05:55 +0100 | [diff] [blame] | 781 | switch (tm->tcpm_daddr.family) { |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 782 | case AF_INET: |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 783 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_ADDR_IPV4, |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 784 | inetpeer_get_addr_v4(&tm->tcpm_daddr)) < 0) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 785 | goto nla_put_failure; |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 786 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_SADDR_IPV4, |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 787 | inetpeer_get_addr_v4(&tm->tcpm_saddr)) < 0) |
Christoph Paasch | 8a59359 | 2014-01-08 16:05:57 +0100 | [diff] [blame] | 788 | goto nla_put_failure; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 789 | break; |
| 790 | case AF_INET6: |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 791 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_ADDR_IPV6, |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 792 | inetpeer_get_addr_v6(&tm->tcpm_daddr)) < 0) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 793 | goto nla_put_failure; |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 794 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_SADDR_IPV6, |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 795 | inetpeer_get_addr_v6(&tm->tcpm_saddr)) < 0) |
Christoph Paasch | 8a59359 | 2014-01-08 16:05:57 +0100 | [diff] [blame] | 796 | goto nla_put_failure; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 797 | break; |
| 798 | default: |
| 799 | return -EAFNOSUPPORT; |
| 800 | } |
| 801 | |
| 802 | if (nla_put_msecs(msg, TCP_METRICS_ATTR_AGE, |
| 803 | jiffies - tm->tcpm_stamp) < 0) |
| 804 | goto nla_put_failure; |
| 805 | if (tm->tcpm_ts_stamp) { |
| 806 | if (nla_put_s32(msg, TCP_METRICS_ATTR_TW_TS_STAMP, |
| 807 | (s32) (get_seconds() - tm->tcpm_ts_stamp)) < 0) |
| 808 | goto nla_put_failure; |
| 809 | if (nla_put_u32(msg, TCP_METRICS_ATTR_TW_TSVAL, |
| 810 | tm->tcpm_ts) < 0) |
| 811 | goto nla_put_failure; |
| 812 | } |
| 813 | |
| 814 | { |
| 815 | int n = 0; |
| 816 | |
| 817 | nest = nla_nest_start(msg, TCP_METRICS_ATTR_VALS); |
| 818 | if (!nest) |
| 819 | goto nla_put_failure; |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 820 | for (i = 0; i < TCP_METRIC_MAX_KERNEL + 1; i++) { |
| 821 | u32 val = tm->tcpm_vals[i]; |
| 822 | |
| 823 | if (!val) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 824 | continue; |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 825 | if (i == TCP_METRIC_RTT) { |
| 826 | if (nla_put_u32(msg, TCP_METRIC_RTT_US + 1, |
| 827 | val) < 0) |
| 828 | goto nla_put_failure; |
| 829 | n++; |
| 830 | val = max(val / 1000, 1U); |
| 831 | } |
| 832 | if (i == TCP_METRIC_RTTVAR) { |
| 833 | if (nla_put_u32(msg, TCP_METRIC_RTTVAR_US + 1, |
| 834 | val) < 0) |
| 835 | goto nla_put_failure; |
| 836 | n++; |
| 837 | val = max(val / 1000, 1U); |
| 838 | } |
| 839 | if (nla_put_u32(msg, i + 1, val) < 0) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 840 | goto nla_put_failure; |
| 841 | n++; |
| 842 | } |
| 843 | if (n) |
| 844 | nla_nest_end(msg, nest); |
| 845 | else |
| 846 | nla_nest_cancel(msg, nest); |
| 847 | } |
| 848 | |
| 849 | { |
| 850 | struct tcp_fastopen_metrics tfom_copy[1], *tfom; |
| 851 | unsigned int seq; |
| 852 | |
| 853 | do { |
| 854 | seq = read_seqbegin(&fastopen_seqlock); |
| 855 | tfom_copy[0] = tm->tcpm_fastopen; |
| 856 | } while (read_seqretry(&fastopen_seqlock, seq)); |
| 857 | |
| 858 | tfom = tfom_copy; |
| 859 | if (tfom->mss && |
| 860 | nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_MSS, |
| 861 | tfom->mss) < 0) |
| 862 | goto nla_put_failure; |
| 863 | if (tfom->syn_loss && |
| 864 | (nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROPS, |
| 865 | tfom->syn_loss) < 0 || |
| 866 | nla_put_msecs(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS, |
| 867 | jiffies - tfom->last_syn_loss) < 0)) |
| 868 | goto nla_put_failure; |
| 869 | if (tfom->cookie.len > 0 && |
| 870 | nla_put(msg, TCP_METRICS_ATTR_FOPEN_COOKIE, |
| 871 | tfom->cookie.len, tfom->cookie.val) < 0) |
| 872 | goto nla_put_failure; |
| 873 | } |
| 874 | |
| 875 | return 0; |
| 876 | |
| 877 | nla_put_failure: |
| 878 | return -EMSGSIZE; |
| 879 | } |
| 880 | |
| 881 | static int tcp_metrics_dump_info(struct sk_buff *skb, |
| 882 | struct netlink_callback *cb, |
| 883 | struct tcp_metrics_block *tm) |
| 884 | { |
| 885 | void *hdr; |
| 886 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 887 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 888 | &tcp_metrics_nl_family, NLM_F_MULTI, |
| 889 | TCP_METRICS_CMD_GET); |
| 890 | if (!hdr) |
| 891 | return -EMSGSIZE; |
| 892 | |
| 893 | if (tcp_metrics_fill_info(skb, tm) < 0) |
| 894 | goto nla_put_failure; |
| 895 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 896 | genlmsg_end(skb, hdr); |
| 897 | return 0; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 898 | |
| 899 | nla_put_failure: |
| 900 | genlmsg_cancel(skb, hdr); |
| 901 | return -EMSGSIZE; |
| 902 | } |
| 903 | |
| 904 | static int tcp_metrics_nl_dump(struct sk_buff *skb, |
| 905 | struct netlink_callback *cb) |
| 906 | { |
| 907 | struct net *net = sock_net(skb->sk); |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 908 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 909 | unsigned int row, s_row = cb->args[0]; |
| 910 | int s_col = cb->args[1], col = s_col; |
| 911 | |
| 912 | for (row = s_row; row < max_rows; row++, s_col = 0) { |
| 913 | struct tcp_metrics_block *tm; |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 914 | struct tcpm_hash_bucket *hb = tcp_metrics_hash + row; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 915 | |
| 916 | rcu_read_lock(); |
| 917 | for (col = 0, tm = rcu_dereference(hb->chain); tm; |
| 918 | tm = rcu_dereference(tm->tcpm_next), col++) { |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 919 | if (!net_eq(tm_net(tm), net)) |
| 920 | continue; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 921 | if (col < s_col) |
| 922 | continue; |
| 923 | if (tcp_metrics_dump_info(skb, cb, tm) < 0) { |
| 924 | rcu_read_unlock(); |
| 925 | goto done; |
| 926 | } |
| 927 | } |
| 928 | rcu_read_unlock(); |
| 929 | } |
| 930 | |
| 931 | done: |
| 932 | cb->args[0] = row; |
| 933 | cb->args[1] = col; |
| 934 | return skb->len; |
| 935 | } |
| 936 | |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 937 | static int __parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
| 938 | unsigned int *hash, int optional, int v4, int v6) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 939 | { |
| 940 | struct nlattr *a; |
| 941 | |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 942 | a = info->attrs[v4]; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 943 | if (a) { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 944 | inetpeer_set_addr_v4(addr, nla_get_in_addr(a)); |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 945 | if (hash) |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 946 | *hash = ipv4_addr_hash(inetpeer_get_addr_v4(addr)); |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 947 | return 0; |
| 948 | } |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 949 | a = info->attrs[v6]; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 950 | if (a) { |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 951 | struct in6_addr in6; |
| 952 | |
Julian Anastasov | 2c42a3f | 2012-10-30 12:03:09 +0000 | [diff] [blame] | 953 | if (nla_len(a) != sizeof(struct in6_addr)) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 954 | return -EINVAL; |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 955 | in6 = nla_get_in6_addr(a); |
| 956 | inetpeer_set_addr_v6(addr, &in6); |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 957 | if (hash) |
David Ahern | 3abef28 | 2015-08-27 16:07:00 -0700 | [diff] [blame] | 958 | *hash = ipv6_addr_hash(inetpeer_get_addr_v6(addr)); |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 959 | return 0; |
| 960 | } |
| 961 | return optional ? 1 : -EAFNOSUPPORT; |
| 962 | } |
| 963 | |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 964 | static int parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
| 965 | unsigned int *hash, int optional) |
| 966 | { |
| 967 | return __parse_nl_addr(info, addr, hash, optional, |
| 968 | TCP_METRICS_ATTR_ADDR_IPV4, |
| 969 | TCP_METRICS_ATTR_ADDR_IPV6); |
| 970 | } |
| 971 | |
| 972 | static int parse_nl_saddr(struct genl_info *info, struct inetpeer_addr *addr) |
| 973 | { |
| 974 | return __parse_nl_addr(info, addr, NULL, 0, |
| 975 | TCP_METRICS_ATTR_SADDR_IPV4, |
| 976 | TCP_METRICS_ATTR_SADDR_IPV6); |
| 977 | } |
| 978 | |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 979 | static int tcp_metrics_nl_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| 980 | { |
| 981 | struct tcp_metrics_block *tm; |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 982 | struct inetpeer_addr saddr, daddr; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 983 | unsigned int hash; |
| 984 | struct sk_buff *msg; |
| 985 | struct net *net = genl_info_net(info); |
| 986 | void *reply; |
| 987 | int ret; |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 988 | bool src = true; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 989 | |
Christoph Paasch | 324fd55 | 2014-01-08 16:05:55 +0100 | [diff] [blame] | 990 | ret = parse_nl_addr(info, &daddr, &hash, 0); |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 991 | if (ret < 0) |
| 992 | return ret; |
| 993 | |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 994 | ret = parse_nl_saddr(info, &saddr); |
| 995 | if (ret < 0) |
| 996 | src = false; |
| 997 | |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 998 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 999 | if (!msg) |
| 1000 | return -ENOMEM; |
| 1001 | |
| 1002 | reply = genlmsg_put_reply(msg, info, &tcp_metrics_nl_family, 0, |
| 1003 | info->genlhdr->cmd); |
| 1004 | if (!reply) |
| 1005 | goto nla_put_failure; |
| 1006 | |
Eric W. Biederman | 3e5da62 | 2015-03-13 00:05:24 -0500 | [diff] [blame] | 1007 | hash ^= net_hash_mix(net); |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1008 | hash = hash_32(hash, tcp_metrics_hash_log); |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1009 | ret = -ESRCH; |
| 1010 | rcu_read_lock(); |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1011 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1012 | tm = rcu_dereference(tm->tcpm_next)) { |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 1013 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 1014 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
| 1015 | net_eq(tm_net(tm), net)) { |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1016 | ret = tcp_metrics_fill_info(msg, tm); |
| 1017 | break; |
| 1018 | } |
| 1019 | } |
| 1020 | rcu_read_unlock(); |
| 1021 | if (ret < 0) |
| 1022 | goto out_free; |
| 1023 | |
| 1024 | genlmsg_end(msg, reply); |
| 1025 | return genlmsg_reply(msg, info); |
| 1026 | |
| 1027 | nla_put_failure: |
| 1028 | ret = -EMSGSIZE; |
| 1029 | |
| 1030 | out_free: |
| 1031 | nlmsg_free(msg); |
| 1032 | return ret; |
| 1033 | } |
| 1034 | |
Eric W. Biederman | 8a4bff7 | 2015-03-13 00:06:43 -0500 | [diff] [blame] | 1035 | static void tcp_metrics_flush_all(struct net *net) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1036 | { |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1037 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
| 1038 | struct tcpm_hash_bucket *hb = tcp_metrics_hash; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1039 | struct tcp_metrics_block *tm; |
| 1040 | unsigned int row; |
| 1041 | |
| 1042 | for (row = 0; row < max_rows; row++, hb++) { |
Eric W. Biederman | 04f721c | 2015-03-13 00:07:10 -0500 | [diff] [blame] | 1043 | struct tcp_metrics_block __rcu **pp; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1044 | spin_lock_bh(&tcp_metrics_lock); |
Eric W. Biederman | 04f721c | 2015-03-13 00:07:10 -0500 | [diff] [blame] | 1045 | pp = &hb->chain; |
Eric Dumazet | 9f1ab18 | 2015-03-16 07:14:34 -0700 | [diff] [blame] | 1046 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
Eric W. Biederman | 04f721c | 2015-03-13 00:07:10 -0500 | [diff] [blame] | 1047 | if (net_eq(tm_net(tm), net)) { |
| 1048 | *pp = tm->tcpm_next; |
| 1049 | kfree_rcu(tm, rcu_head); |
| 1050 | } else { |
| 1051 | pp = &tm->tcpm_next; |
| 1052 | } |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1053 | } |
Eric W. Biederman | 04f721c | 2015-03-13 00:07:10 -0500 | [diff] [blame] | 1054 | spin_unlock_bh(&tcp_metrics_lock); |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1055 | } |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1056 | } |
| 1057 | |
| 1058 | static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| 1059 | { |
| 1060 | struct tcpm_hash_bucket *hb; |
Christoph Paasch | 00ca9c5 | 2014-01-21 13:30:26 +0100 | [diff] [blame] | 1061 | struct tcp_metrics_block *tm; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1062 | struct tcp_metrics_block __rcu **pp; |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 1063 | struct inetpeer_addr saddr, daddr; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1064 | unsigned int hash; |
| 1065 | struct net *net = genl_info_net(info); |
| 1066 | int ret; |
Christoph Paasch | 00ca9c5 | 2014-01-21 13:30:26 +0100 | [diff] [blame] | 1067 | bool src = true, found = false; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1068 | |
Christoph Paasch | 324fd55 | 2014-01-08 16:05:55 +0100 | [diff] [blame] | 1069 | ret = parse_nl_addr(info, &daddr, &hash, 1); |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1070 | if (ret < 0) |
| 1071 | return ret; |
Eric W. Biederman | 8a4bff7 | 2015-03-13 00:06:43 -0500 | [diff] [blame] | 1072 | if (ret > 0) { |
| 1073 | tcp_metrics_flush_all(net); |
| 1074 | return 0; |
| 1075 | } |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 1076 | ret = parse_nl_saddr(info, &saddr); |
| 1077 | if (ret < 0) |
| 1078 | src = false; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1079 | |
Eric W. Biederman | 3e5da62 | 2015-03-13 00:05:24 -0500 | [diff] [blame] | 1080 | hash ^= net_hash_mix(net); |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1081 | hash = hash_32(hash, tcp_metrics_hash_log); |
| 1082 | hb = tcp_metrics_hash + hash; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1083 | pp = &hb->chain; |
| 1084 | spin_lock_bh(&tcp_metrics_lock); |
Eric Dumazet | 9f1ab18 | 2015-03-16 07:14:34 -0700 | [diff] [blame] | 1085 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
Christoph Paasch | 3e7013d | 2014-01-08 16:05:59 +0100 | [diff] [blame] | 1086 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
Eric W. Biederman | 849e8a0 | 2015-03-13 00:05:52 -0500 | [diff] [blame] | 1087 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
| 1088 | net_eq(tm_net(tm), net)) { |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1089 | *pp = tm->tcpm_next; |
Christoph Paasch | 00ca9c5 | 2014-01-21 13:30:26 +0100 | [diff] [blame] | 1090 | kfree_rcu(tm, rcu_head); |
| 1091 | found = true; |
Christoph Paasch | bbf852b | 2014-01-08 16:05:58 +0100 | [diff] [blame] | 1092 | } else { |
| 1093 | pp = &tm->tcpm_next; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1094 | } |
| 1095 | } |
| 1096 | spin_unlock_bh(&tcp_metrics_lock); |
Christoph Paasch | 00ca9c5 | 2014-01-21 13:30:26 +0100 | [diff] [blame] | 1097 | if (!found) |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1098 | return -ESRCH; |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1099 | return 0; |
| 1100 | } |
| 1101 | |
Johannes Berg | 4534de8 | 2013-11-14 17:14:46 +0100 | [diff] [blame] | 1102 | static const struct genl_ops tcp_metrics_nl_ops[] = { |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1103 | { |
| 1104 | .cmd = TCP_METRICS_CMD_GET, |
| 1105 | .doit = tcp_metrics_nl_cmd_get, |
| 1106 | .dumpit = tcp_metrics_nl_dump, |
| 1107 | .policy = tcp_metrics_nl_policy, |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1108 | }, |
| 1109 | { |
| 1110 | .cmd = TCP_METRICS_CMD_DEL, |
| 1111 | .doit = tcp_metrics_nl_cmd_del, |
| 1112 | .policy = tcp_metrics_nl_policy, |
| 1113 | .flags = GENL_ADMIN_PERM, |
| 1114 | }, |
| 1115 | }; |
| 1116 | |
Eric Dumazet | 5815d5e | 2012-07-19 23:02:34 +0000 | [diff] [blame] | 1117 | static unsigned int tcpmhash_entries; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1118 | static int __init set_tcpmhash_entries(char *str) |
| 1119 | { |
| 1120 | ssize_t ret; |
| 1121 | |
| 1122 | if (!str) |
| 1123 | return 0; |
| 1124 | |
Eric Dumazet | 5815d5e | 2012-07-19 23:02:34 +0000 | [diff] [blame] | 1125 | ret = kstrtouint(str, 0, &tcpmhash_entries); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1126 | if (ret) |
| 1127 | return 0; |
| 1128 | |
| 1129 | return 1; |
| 1130 | } |
| 1131 | __setup("tcpmhash_entries=", set_tcpmhash_entries); |
| 1132 | |
| 1133 | static int __net_init tcp_net_metrics_init(struct net *net) |
| 1134 | { |
Eric Dumazet | 5815d5e | 2012-07-19 23:02:34 +0000 | [diff] [blame] | 1135 | size_t size; |
| 1136 | unsigned int slots; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1137 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1138 | if (!net_eq(net, &init_net)) |
| 1139 | return 0; |
| 1140 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1141 | slots = tcpmhash_entries; |
| 1142 | if (!slots) { |
| 1143 | if (totalram_pages >= 128 * 1024) |
| 1144 | slots = 16 * 1024; |
| 1145 | else |
| 1146 | slots = 8 * 1024; |
| 1147 | } |
| 1148 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1149 | tcp_metrics_hash_log = order_base_2(slots); |
| 1150 | size = sizeof(struct tcpm_hash_bucket) << tcp_metrics_hash_log; |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1151 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1152 | tcp_metrics_hash = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); |
| 1153 | if (!tcp_metrics_hash) |
| 1154 | tcp_metrics_hash = vzalloc(size); |
Eric Dumazet | 976a702 | 2012-11-16 05:31:53 +0000 | [diff] [blame] | 1155 | |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1156 | if (!tcp_metrics_hash) |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1157 | return -ENOMEM; |
| 1158 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1159 | return 0; |
| 1160 | } |
| 1161 | |
| 1162 | static void __net_exit tcp_net_metrics_exit(struct net *net) |
| 1163 | { |
Eric W. Biederman | 098a697 | 2015-03-13 00:07:44 -0500 | [diff] [blame] | 1164 | tcp_metrics_flush_all(net); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1165 | } |
| 1166 | |
| 1167 | static __net_initdata struct pernet_operations tcp_net_metrics_ops = { |
| 1168 | .init = tcp_net_metrics_init, |
| 1169 | .exit = tcp_net_metrics_exit, |
| 1170 | }; |
| 1171 | |
| 1172 | void __init tcp_metrics_init(void) |
| 1173 | { |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1174 | int ret; |
| 1175 | |
| 1176 | ret = register_pernet_subsys(&tcp_net_metrics_ops); |
| 1177 | if (ret < 0) |
Eric W. Biederman | 6493517 | 2015-03-13 00:04:51 -0500 | [diff] [blame] | 1178 | panic("Could not allocate the tcp_metrics hash table\n"); |
| 1179 | |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1180 | ret = genl_register_family_with_ops(&tcp_metrics_nl_family, |
Johannes Berg | c53ed74 | 2013-11-19 15:19:31 +0100 | [diff] [blame] | 1181 | tcp_metrics_nl_ops); |
Julian Anastasov | d23ff70 | 2012-09-04 11:03:15 +0000 | [diff] [blame] | 1182 | if (ret < 0) |
Eric W. Biederman | 6493517 | 2015-03-13 00:04:51 -0500 | [diff] [blame] | 1183 | panic("Could not register tcp_metrics generic netlink\n"); |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 1184 | } |