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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
51c5d0c4 DM |
2 | #include <linux/rcupdate.h> |
3 | #include <linux/spinlock.h> | |
4 | #include <linux/jiffies.h> | |
ab92bb2f | 5 | #include <linux/module.h> |
4aabd8ef | 6 | #include <linux/cache.h> |
51c5d0c4 DM |
7 | #include <linux/slab.h> |
8 | #include <linux/init.h> | |
4aabd8ef | 9 | #include <linux/tcp.h> |
5815d5e7 | 10 | #include <linux/hash.h> |
d23ff701 | 11 | #include <linux/tcp_metrics.h> |
976a702a | 12 | #include <linux/vmalloc.h> |
4aabd8ef DM |
13 | |
14 | #include <net/inet_connection_sock.h> | |
51c5d0c4 | 15 | #include <net/net_namespace.h> |
ab92bb2f | 16 | #include <net/request_sock.h> |
51c5d0c4 | 17 | #include <net/inetpeer.h> |
4aabd8ef | 18 | #include <net/sock.h> |
51c5d0c4 | 19 | #include <net/ipv6.h> |
4aabd8ef DM |
20 | #include <net/dst.h> |
21 | #include <net/tcp.h> | |
d23ff701 | 22 | #include <net/genetlink.h> |
4aabd8ef DM |
23 | |
24 | int sysctl_tcp_nometrics_save __read_mostly; | |
25 | ||
41804420 DM |
26 | static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr, |
27 | const struct inetpeer_addr *daddr, | |
77f99ad1 CP |
28 | struct net *net, unsigned int hash); |
29 | ||
1fe4c481 YC |
30 | struct tcp_fastopen_metrics { |
31 | u16 mss; | |
2646c831 DL |
32 | u16 syn_loss:10, /* Recurring Fast Open SYN losses */ |
33 | try_exp:2; /* Request w/ exp. option (once) */ | |
aab48743 | 34 | unsigned long last_syn_loss; /* Last Fast Open SYN loss */ |
1fe4c481 YC |
35 | struct tcp_fastopen_cookie cookie; |
36 | }; | |
37 | ||
740b0f18 ED |
38 | /* TCP_METRIC_MAX includes 2 extra fields for userspace compatibility |
39 | * Kernel only stores RTT and RTTVAR in usec resolution | |
40 | */ | |
41 | #define TCP_METRIC_MAX_KERNEL (TCP_METRIC_MAX - 2) | |
42 | ||
51c5d0c4 DM |
43 | struct tcp_metrics_block { |
44 | struct tcp_metrics_block __rcu *tcpm_next; | |
849e8a0c | 45 | possible_net_t tcpm_net; |
a5443028 | 46 | struct inetpeer_addr tcpm_saddr; |
324fd55a | 47 | struct inetpeer_addr tcpm_daddr; |
51c5d0c4 DM |
48 | unsigned long tcpm_stamp; |
49 | u32 tcpm_lock; | |
740b0f18 | 50 | u32 tcpm_vals[TCP_METRIC_MAX_KERNEL + 1]; |
1fe4c481 | 51 | struct tcp_fastopen_metrics tcpm_fastopen; |
d23ff701 JA |
52 | |
53 | struct rcu_head rcu_head; | |
51c5d0c4 DM |
54 | }; |
55 | ||
849e8a0c EB |
56 | static inline struct net *tm_net(struct tcp_metrics_block *tm) |
57 | { | |
58 | return read_pnet(&tm->tcpm_net); | |
59 | } | |
60 | ||
51c5d0c4 DM |
61 | static bool tcp_metric_locked(struct tcp_metrics_block *tm, |
62 | enum tcp_metric_index idx) | |
63 | { | |
64 | return tm->tcpm_lock & (1 << idx); | |
65 | } | |
66 | ||
67 | static u32 tcp_metric_get(struct tcp_metrics_block *tm, | |
68 | enum tcp_metric_index idx) | |
69 | { | |
70 | return tm->tcpm_vals[idx]; | |
71 | } | |
72 | ||
51c5d0c4 DM |
73 | static void tcp_metric_set(struct tcp_metrics_block *tm, |
74 | enum tcp_metric_index idx, | |
75 | u32 val) | |
76 | { | |
77 | tm->tcpm_vals[idx] = val; | |
78 | } | |
79 | ||
51c5d0c4 DM |
80 | static bool addr_same(const struct inetpeer_addr *a, |
81 | const struct inetpeer_addr *b) | |
82 | { | |
d39d14ff | 83 | return inetpeer_addr_cmp(a, b) == 0; |
51c5d0c4 DM |
84 | } |
85 | ||
86 | struct tcpm_hash_bucket { | |
87 | struct tcp_metrics_block __rcu *chain; | |
88 | }; | |
89 | ||
098a697b EB |
90 | static struct tcpm_hash_bucket *tcp_metrics_hash __read_mostly; |
91 | static unsigned int tcp_metrics_hash_log __read_mostly; | |
92 | ||
51c5d0c4 DM |
93 | static DEFINE_SPINLOCK(tcp_metrics_lock); |
94 | ||
740b0f18 ED |
95 | static void tcpm_suck_dst(struct tcp_metrics_block *tm, |
96 | const struct dst_entry *dst, | |
efeaa555 | 97 | bool fastopen_clear) |
51c5d0c4 | 98 | { |
740b0f18 | 99 | u32 msval; |
51c5d0c4 DM |
100 | u32 val; |
101 | ||
9a0a9502 JA |
102 | tm->tcpm_stamp = jiffies; |
103 | ||
51c5d0c4 DM |
104 | val = 0; |
105 | if (dst_metric_locked(dst, RTAX_RTT)) | |
106 | val |= 1 << TCP_METRIC_RTT; | |
107 | if (dst_metric_locked(dst, RTAX_RTTVAR)) | |
108 | val |= 1 << TCP_METRIC_RTTVAR; | |
109 | if (dst_metric_locked(dst, RTAX_SSTHRESH)) | |
110 | val |= 1 << TCP_METRIC_SSTHRESH; | |
111 | if (dst_metric_locked(dst, RTAX_CWND)) | |
112 | val |= 1 << TCP_METRIC_CWND; | |
113 | if (dst_metric_locked(dst, RTAX_REORDERING)) | |
114 | val |= 1 << TCP_METRIC_REORDERING; | |
115 | tm->tcpm_lock = val; | |
116 | ||
740b0f18 ED |
117 | msval = dst_metric_raw(dst, RTAX_RTT); |
118 | tm->tcpm_vals[TCP_METRIC_RTT] = msval * USEC_PER_MSEC; | |
119 | ||
120 | msval = dst_metric_raw(dst, RTAX_RTTVAR); | |
121 | tm->tcpm_vals[TCP_METRIC_RTTVAR] = msval * USEC_PER_MSEC; | |
51c5d0c4 DM |
122 | tm->tcpm_vals[TCP_METRIC_SSTHRESH] = dst_metric_raw(dst, RTAX_SSTHRESH); |
123 | tm->tcpm_vals[TCP_METRIC_CWND] = dst_metric_raw(dst, RTAX_CWND); | |
124 | tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING); | |
efeaa555 ED |
125 | if (fastopen_clear) { |
126 | tm->tcpm_fastopen.mss = 0; | |
127 | tm->tcpm_fastopen.syn_loss = 0; | |
2646c831 DL |
128 | tm->tcpm_fastopen.try_exp = 0; |
129 | tm->tcpm_fastopen.cookie.exp = false; | |
efeaa555 ED |
130 | tm->tcpm_fastopen.cookie.len = 0; |
131 | } | |
51c5d0c4 DM |
132 | } |
133 | ||
77f99ad1 CP |
134 | #define TCP_METRICS_TIMEOUT (60 * 60 * HZ) |
135 | ||
136 | static void tcpm_check_stamp(struct tcp_metrics_block *tm, struct dst_entry *dst) | |
137 | { | |
138 | if (tm && unlikely(time_after(jiffies, tm->tcpm_stamp + TCP_METRICS_TIMEOUT))) | |
139 | tcpm_suck_dst(tm, dst, false); | |
140 | } | |
141 | ||
142 | #define TCP_METRICS_RECLAIM_DEPTH 5 | |
143 | #define TCP_METRICS_RECLAIM_PTR (struct tcp_metrics_block *) 0x1UL | |
144 | ||
9f1ab186 ED |
145 | #define deref_locked(p) \ |
146 | rcu_dereference_protected(p, lockdep_is_held(&tcp_metrics_lock)) | |
147 | ||
51c5d0c4 | 148 | static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst, |
a5443028 | 149 | struct inetpeer_addr *saddr, |
324fd55a | 150 | struct inetpeer_addr *daddr, |
77f99ad1 | 151 | unsigned int hash) |
51c5d0c4 DM |
152 | { |
153 | struct tcp_metrics_block *tm; | |
154 | struct net *net; | |
77f99ad1 | 155 | bool reclaim = false; |
51c5d0c4 DM |
156 | |
157 | spin_lock_bh(&tcp_metrics_lock); | |
158 | net = dev_net(dst->dev); | |
77f99ad1 CP |
159 | |
160 | /* While waiting for the spin-lock the cache might have been populated | |
161 | * with this entry and so we have to check again. | |
162 | */ | |
41804420 | 163 | tm = __tcp_get_metrics(saddr, daddr, net, hash); |
77f99ad1 CP |
164 | if (tm == TCP_METRICS_RECLAIM_PTR) { |
165 | reclaim = true; | |
166 | tm = NULL; | |
167 | } | |
168 | if (tm) { | |
169 | tcpm_check_stamp(tm, dst); | |
170 | goto out_unlock; | |
171 | } | |
172 | ||
51c5d0c4 DM |
173 | if (unlikely(reclaim)) { |
174 | struct tcp_metrics_block *oldest; | |
175 | ||
9f1ab186 ED |
176 | oldest = deref_locked(tcp_metrics_hash[hash].chain); |
177 | for (tm = deref_locked(oldest->tcpm_next); tm; | |
178 | tm = deref_locked(tm->tcpm_next)) { | |
51c5d0c4 DM |
179 | if (time_before(tm->tcpm_stamp, oldest->tcpm_stamp)) |
180 | oldest = tm; | |
181 | } | |
182 | tm = oldest; | |
183 | } else { | |
184 | tm = kmalloc(sizeof(*tm), GFP_ATOMIC); | |
185 | if (!tm) | |
186 | goto out_unlock; | |
187 | } | |
849e8a0c | 188 | write_pnet(&tm->tcpm_net, net); |
a5443028 | 189 | tm->tcpm_saddr = *saddr; |
324fd55a | 190 | tm->tcpm_daddr = *daddr; |
51c5d0c4 | 191 | |
efeaa555 | 192 | tcpm_suck_dst(tm, dst, true); |
51c5d0c4 DM |
193 | |
194 | if (likely(!reclaim)) { | |
098a697b EB |
195 | tm->tcpm_next = tcp_metrics_hash[hash].chain; |
196 | rcu_assign_pointer(tcp_metrics_hash[hash].chain, tm); | |
51c5d0c4 DM |
197 | } |
198 | ||
199 | out_unlock: | |
200 | spin_unlock_bh(&tcp_metrics_lock); | |
201 | return tm; | |
202 | } | |
203 | ||
51c5d0c4 DM |
204 | static struct tcp_metrics_block *tcp_get_encode(struct tcp_metrics_block *tm, int depth) |
205 | { | |
206 | if (tm) | |
207 | return tm; | |
208 | if (depth > TCP_METRICS_RECLAIM_DEPTH) | |
209 | return TCP_METRICS_RECLAIM_PTR; | |
210 | return NULL; | |
211 | } | |
212 | ||
a5443028 CP |
213 | static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr, |
214 | const struct inetpeer_addr *daddr, | |
51c5d0c4 DM |
215 | struct net *net, unsigned int hash) |
216 | { | |
217 | struct tcp_metrics_block *tm; | |
218 | int depth = 0; | |
219 | ||
098a697b | 220 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
51c5d0c4 | 221 | tm = rcu_dereference(tm->tcpm_next)) { |
a5443028 | 222 | if (addr_same(&tm->tcpm_saddr, saddr) && |
849e8a0c EB |
223 | addr_same(&tm->tcpm_daddr, daddr) && |
224 | net_eq(tm_net(tm), net)) | |
51c5d0c4 DM |
225 | break; |
226 | depth++; | |
227 | } | |
228 | return tcp_get_encode(tm, depth); | |
229 | } | |
230 | ||
231 | static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req, | |
232 | struct dst_entry *dst) | |
233 | { | |
234 | struct tcp_metrics_block *tm; | |
a5443028 | 235 | struct inetpeer_addr saddr, daddr; |
51c5d0c4 DM |
236 | unsigned int hash; |
237 | struct net *net; | |
238 | ||
a5443028 | 239 | saddr.family = req->rsk_ops->family; |
324fd55a CP |
240 | daddr.family = req->rsk_ops->family; |
241 | switch (daddr.family) { | |
51c5d0c4 | 242 | case AF_INET: |
3abef286 DA |
243 | inetpeer_set_addr_v4(&saddr, inet_rsk(req)->ir_loc_addr); |
244 | inetpeer_set_addr_v4(&daddr, inet_rsk(req)->ir_rmt_addr); | |
72afa352 | 245 | hash = ipv4_addr_hash(inet_rsk(req)->ir_rmt_addr); |
51c5d0c4 | 246 | break; |
634fb979 | 247 | #if IS_ENABLED(CONFIG_IPV6) |
51c5d0c4 | 248 | case AF_INET6: |
3abef286 DA |
249 | inetpeer_set_addr_v6(&saddr, &inet_rsk(req)->ir_v6_loc_addr); |
250 | inetpeer_set_addr_v6(&daddr, &inet_rsk(req)->ir_v6_rmt_addr); | |
634fb979 | 251 | hash = ipv6_addr_hash(&inet_rsk(req)->ir_v6_rmt_addr); |
51c5d0c4 | 252 | break; |
634fb979 | 253 | #endif |
51c5d0c4 DM |
254 | default: |
255 | return NULL; | |
256 | } | |
257 | ||
51c5d0c4 | 258 | net = dev_net(dst->dev); |
3e5da62d | 259 | hash ^= net_hash_mix(net); |
098a697b | 260 | hash = hash_32(hash, tcp_metrics_hash_log); |
51c5d0c4 | 261 | |
098a697b | 262 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
51c5d0c4 | 263 | tm = rcu_dereference(tm->tcpm_next)) { |
a5443028 | 264 | if (addr_same(&tm->tcpm_saddr, &saddr) && |
849e8a0c EB |
265 | addr_same(&tm->tcpm_daddr, &daddr) && |
266 | net_eq(tm_net(tm), net)) | |
51c5d0c4 DM |
267 | break; |
268 | } | |
269 | tcpm_check_stamp(tm, dst); | |
270 | return tm; | |
271 | } | |
272 | ||
273 | static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk, | |
274 | struct dst_entry *dst, | |
275 | bool create) | |
276 | { | |
277 | struct tcp_metrics_block *tm; | |
a5443028 | 278 | struct inetpeer_addr saddr, daddr; |
51c5d0c4 DM |
279 | unsigned int hash; |
280 | struct net *net; | |
51c5d0c4 | 281 | |
3ad88cf7 | 282 | if (sk->sk_family == AF_INET) { |
3abef286 DA |
283 | inetpeer_set_addr_v4(&saddr, inet_sk(sk)->inet_saddr); |
284 | inetpeer_set_addr_v4(&daddr, inet_sk(sk)->inet_daddr); | |
72afa352 | 285 | hash = ipv4_addr_hash(inet_sk(sk)->inet_daddr); |
3ad88cf7 | 286 | } |
c2bb06db | 287 | #if IS_ENABLED(CONFIG_IPV6) |
3ad88cf7 CP |
288 | else if (sk->sk_family == AF_INET6) { |
289 | if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { | |
3abef286 DA |
290 | inetpeer_set_addr_v4(&saddr, inet_sk(sk)->inet_saddr); |
291 | inetpeer_set_addr_v4(&daddr, inet_sk(sk)->inet_daddr); | |
72afa352 | 292 | hash = ipv4_addr_hash(inet_sk(sk)->inet_daddr); |
3ad88cf7 | 293 | } else { |
3abef286 DA |
294 | inetpeer_set_addr_v6(&saddr, &sk->sk_v6_rcv_saddr); |
295 | inetpeer_set_addr_v6(&daddr, &sk->sk_v6_daddr); | |
3ad88cf7 CP |
296 | hash = ipv6_addr_hash(&sk->sk_v6_daddr); |
297 | } | |
298 | } | |
c2bb06db | 299 | #endif |
3ad88cf7 | 300 | else |
51c5d0c4 | 301 | return NULL; |
51c5d0c4 | 302 | |
51c5d0c4 | 303 | net = dev_net(dst->dev); |
3e5da62d | 304 | hash ^= net_hash_mix(net); |
098a697b | 305 | hash = hash_32(hash, tcp_metrics_hash_log); |
51c5d0c4 | 306 | |
a5443028 | 307 | tm = __tcp_get_metrics(&saddr, &daddr, net, hash); |
77f99ad1 | 308 | if (tm == TCP_METRICS_RECLAIM_PTR) |
51c5d0c4 | 309 | tm = NULL; |
51c5d0c4 | 310 | if (!tm && create) |
41804420 | 311 | tm = tcpm_new(dst, &saddr, &daddr, hash); |
51c5d0c4 DM |
312 | else |
313 | tcpm_check_stamp(tm, dst); | |
314 | ||
315 | return tm; | |
316 | } | |
317 | ||
4aabd8ef DM |
318 | /* Save metrics learned by this TCP session. This function is called |
319 | * only, when TCP finishes successfully i.e. when it enters TIME-WAIT | |
320 | * or goes from LAST-ACK to CLOSE. | |
321 | */ | |
322 | void tcp_update_metrics(struct sock *sk) | |
323 | { | |
51c5d0c4 | 324 | const struct inet_connection_sock *icsk = inet_csk(sk); |
4aabd8ef | 325 | struct dst_entry *dst = __sk_dst_get(sk); |
51c5d0c4 | 326 | struct tcp_sock *tp = tcp_sk(sk); |
1043e25f | 327 | struct net *net = sock_net(sk); |
51c5d0c4 DM |
328 | struct tcp_metrics_block *tm; |
329 | unsigned long rtt; | |
330 | u32 val; | |
331 | int m; | |
4aabd8ef | 332 | |
c3a2e837 | 333 | sk_dst_confirm(sk); |
51c5d0c4 | 334 | if (sysctl_tcp_nometrics_save || !dst) |
4aabd8ef DM |
335 | return; |
336 | ||
51c5d0c4 | 337 | rcu_read_lock(); |
740b0f18 | 338 | if (icsk->icsk_backoff || !tp->srtt_us) { |
51c5d0c4 DM |
339 | /* This session failed to estimate rtt. Why? |
340 | * Probably, no packets returned in time. Reset our | |
341 | * results. | |
342 | */ | |
343 | tm = tcp_get_metrics(sk, dst, false); | |
344 | if (tm && !tcp_metric_locked(tm, TCP_METRIC_RTT)) | |
345 | tcp_metric_set(tm, TCP_METRIC_RTT, 0); | |
346 | goto out_unlock; | |
347 | } else | |
348 | tm = tcp_get_metrics(sk, dst, true); | |
4aabd8ef | 349 | |
51c5d0c4 DM |
350 | if (!tm) |
351 | goto out_unlock; | |
4aabd8ef | 352 | |
740b0f18 ED |
353 | rtt = tcp_metric_get(tm, TCP_METRIC_RTT); |
354 | m = rtt - tp->srtt_us; | |
4aabd8ef | 355 | |
51c5d0c4 DM |
356 | /* If newly calculated rtt larger than stored one, store new |
357 | * one. Otherwise, use EWMA. Remember, rtt overestimation is | |
358 | * always better than underestimation. | |
359 | */ | |
360 | if (!tcp_metric_locked(tm, TCP_METRIC_RTT)) { | |
361 | if (m <= 0) | |
740b0f18 | 362 | rtt = tp->srtt_us; |
51c5d0c4 DM |
363 | else |
364 | rtt -= (m >> 3); | |
740b0f18 | 365 | tcp_metric_set(tm, TCP_METRIC_RTT, rtt); |
51c5d0c4 | 366 | } |
4aabd8ef | 367 | |
51c5d0c4 DM |
368 | if (!tcp_metric_locked(tm, TCP_METRIC_RTTVAR)) { |
369 | unsigned long var; | |
4aabd8ef | 370 | |
51c5d0c4 DM |
371 | if (m < 0) |
372 | m = -m; | |
4aabd8ef | 373 | |
51c5d0c4 DM |
374 | /* Scale deviation to rttvar fixed point */ |
375 | m >>= 1; | |
740b0f18 ED |
376 | if (m < tp->mdev_us) |
377 | m = tp->mdev_us; | |
4aabd8ef | 378 | |
740b0f18 | 379 | var = tcp_metric_get(tm, TCP_METRIC_RTTVAR); |
51c5d0c4 DM |
380 | if (m >= var) |
381 | var = m; | |
382 | else | |
383 | var -= (var - m) >> 2; | |
4aabd8ef | 384 | |
740b0f18 | 385 | tcp_metric_set(tm, TCP_METRIC_RTTVAR, var); |
51c5d0c4 DM |
386 | } |
387 | ||
388 | if (tcp_in_initial_slowstart(tp)) { | |
389 | /* Slow start still did not finish. */ | |
390 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { | |
391 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); | |
392 | if (val && (tp->snd_cwnd >> 1) > val) | |
393 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
394 | tp->snd_cwnd >> 1); | |
395 | } | |
396 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { | |
397 | val = tcp_metric_get(tm, TCP_METRIC_CWND); | |
398 | if (tp->snd_cwnd > val) | |
399 | tcp_metric_set(tm, TCP_METRIC_CWND, | |
400 | tp->snd_cwnd); | |
401 | } | |
071d5080 | 402 | } else if (!tcp_in_slow_start(tp) && |
51c5d0c4 DM |
403 | icsk->icsk_ca_state == TCP_CA_Open) { |
404 | /* Cong. avoidance phase, cwnd is reliable. */ | |
405 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) | |
406 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
407 | max(tp->snd_cwnd >> 1, tp->snd_ssthresh)); | |
408 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { | |
409 | val = tcp_metric_get(tm, TCP_METRIC_CWND); | |
2100844c | 410 | tcp_metric_set(tm, TCP_METRIC_CWND, (val + tp->snd_cwnd) >> 1); |
51c5d0c4 DM |
411 | } |
412 | } else { | |
413 | /* Else slow start did not finish, cwnd is non-sense, | |
414 | * ssthresh may be also invalid. | |
415 | */ | |
416 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { | |
417 | val = tcp_metric_get(tm, TCP_METRIC_CWND); | |
418 | tcp_metric_set(tm, TCP_METRIC_CWND, | |
419 | (val + tp->snd_ssthresh) >> 1); | |
420 | } | |
421 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { | |
422 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); | |
423 | if (val && tp->snd_ssthresh > val) | |
424 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
425 | tp->snd_ssthresh); | |
426 | } | |
427 | if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) { | |
428 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); | |
429 | if (val < tp->reordering && | |
1043e25f | 430 | tp->reordering != net->ipv4.sysctl_tcp_reordering) |
51c5d0c4 DM |
431 | tcp_metric_set(tm, TCP_METRIC_REORDERING, |
432 | tp->reordering); | |
4aabd8ef DM |
433 | } |
434 | } | |
51c5d0c4 DM |
435 | tm->tcpm_stamp = jiffies; |
436 | out_unlock: | |
437 | rcu_read_unlock(); | |
4aabd8ef DM |
438 | } |
439 | ||
440 | /* Initialize metrics on socket. */ | |
441 | ||
442 | void tcp_init_metrics(struct sock *sk) | |
443 | { | |
4aabd8ef | 444 | struct dst_entry *dst = __sk_dst_get(sk); |
51c5d0c4 DM |
445 | struct tcp_sock *tp = tcp_sk(sk); |
446 | struct tcp_metrics_block *tm; | |
1b7fdd2a | 447 | u32 val, crtt = 0; /* cached RTT scaled by 8 */ |
4aabd8ef | 448 | |
c3a2e837 | 449 | sk_dst_confirm(sk); |
51456b29 | 450 | if (!dst) |
4aabd8ef DM |
451 | goto reset; |
452 | ||
51c5d0c4 DM |
453 | rcu_read_lock(); |
454 | tm = tcp_get_metrics(sk, dst, true); | |
455 | if (!tm) { | |
456 | rcu_read_unlock(); | |
457 | goto reset; | |
458 | } | |
459 | ||
460 | if (tcp_metric_locked(tm, TCP_METRIC_CWND)) | |
461 | tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND); | |
462 | ||
463 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); | |
464 | if (val) { | |
465 | tp->snd_ssthresh = val; | |
4aabd8ef DM |
466 | if (tp->snd_ssthresh > tp->snd_cwnd_clamp) |
467 | tp->snd_ssthresh = tp->snd_cwnd_clamp; | |
468 | } else { | |
469 | /* ssthresh may have been reduced unnecessarily during. | |
470 | * 3WHS. Restore it back to its initial default. | |
471 | */ | |
472 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; | |
473 | } | |
51c5d0c4 DM |
474 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); |
475 | if (val && tp->reordering != val) { | |
4aabd8ef | 476 | tcp_disable_fack(tp); |
51c5d0c4 | 477 | tp->reordering = val; |
4aabd8ef DM |
478 | } |
479 | ||
740b0f18 | 480 | crtt = tcp_metric_get(tm, TCP_METRIC_RTT); |
51c5d0c4 | 481 | rcu_read_unlock(); |
4aabd8ef | 482 | reset: |
52f20e65 YC |
483 | /* The initial RTT measurement from the SYN/SYN-ACK is not ideal |
484 | * to seed the RTO for later data packets because SYN packets are | |
485 | * small. Use the per-dst cached values to seed the RTO but keep | |
486 | * the RTT estimator variables intact (e.g., srtt, mdev, rttvar). | |
487 | * Later the RTO will be updated immediately upon obtaining the first | |
488 | * data RTT sample (tcp_rtt_estimator()). Hence the cached RTT only | |
489 | * influences the first RTO but not later RTT estimation. | |
490 | * | |
491 | * But if RTT is not available from the SYN (due to retransmits or | |
492 | * syn cookies) or the cache, force a conservative 3secs timeout. | |
493 | * | |
494 | * A bit of theory. RTT is time passed after "normal" sized packet | |
495 | * is sent until it is ACKed. In normal circumstances sending small | |
496 | * packets force peer to delay ACKs and calculation is correct too. | |
497 | * The algorithm is adaptive and, provided we follow specs, it | |
498 | * NEVER underestimate RTT. BUT! If peer tries to make some clever | |
499 | * tricks sort of "quick acks" for time long enough to decrease RTT | |
500 | * to low value, and then abruptly stops to do it and starts to delay | |
501 | * ACKs, wait for troubles. | |
502 | */ | |
740b0f18 | 503 | if (crtt > tp->srtt_us) { |
269aa759 | 504 | /* Set RTO like tcp_rtt_estimator(), but from cached RTT. */ |
9bdfb3b7 | 505 | crtt /= 8 * USEC_PER_SEC / HZ; |
269aa759 | 506 | inet_csk(sk)->icsk_rto = crtt + max(2 * crtt, tcp_rto_min(sk)); |
740b0f18 | 507 | } else if (tp->srtt_us == 0) { |
4aabd8ef DM |
508 | /* RFC6298: 5.7 We've failed to get a valid RTT sample from |
509 | * 3WHS. This is most likely due to retransmission, | |
510 | * including spurious one. Reset the RTO back to 3secs | |
511 | * from the more aggressive 1sec to avoid more spurious | |
512 | * retransmission. | |
513 | */ | |
740b0f18 ED |
514 | tp->rttvar_us = jiffies_to_usecs(TCP_TIMEOUT_FALLBACK); |
515 | tp->mdev_us = tp->mdev_max_us = tp->rttvar_us; | |
516 | ||
4aabd8ef DM |
517 | inet_csk(sk)->icsk_rto = TCP_TIMEOUT_FALLBACK; |
518 | } | |
519 | /* Cut cwnd down to 1 per RFC5681 if SYN or SYN-ACK has been | |
520 | * retransmitted. In light of RFC6298 more aggressive 1sec | |
521 | * initRTO, we only reset cwnd when more than 1 SYN/SYN-ACK | |
522 | * retransmission has occurred. | |
523 | */ | |
524 | if (tp->total_retrans > 1) | |
525 | tp->snd_cwnd = 1; | |
526 | else | |
527 | tp->snd_cwnd = tcp_init_cwnd(tp, dst); | |
c2203cf7 | 528 | tp->snd_cwnd_stamp = tcp_jiffies32; |
4aabd8ef | 529 | } |
ab92bb2f | 530 | |
d82bae12 | 531 | bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst) |
ab92bb2f | 532 | { |
51c5d0c4 DM |
533 | struct tcp_metrics_block *tm; |
534 | bool ret; | |
535 | ||
ab92bb2f DM |
536 | if (!dst) |
537 | return false; | |
51c5d0c4 DM |
538 | |
539 | rcu_read_lock(); | |
540 | tm = __tcp_get_metrics_req(req, dst); | |
d82bae12 | 541 | if (tm && tcp_metric_get(tm, TCP_METRIC_RTT)) |
81166dd6 | 542 | ret = true; |
d82bae12 SHY |
543 | else |
544 | ret = false; | |
81166dd6 DM |
545 | rcu_read_unlock(); |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
1fe4c481 YC |
550 | static DEFINE_SEQLOCK(fastopen_seqlock); |
551 | ||
552 | void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, | |
aab48743 YC |
553 | struct tcp_fastopen_cookie *cookie, |
554 | int *syn_loss, unsigned long *last_syn_loss) | |
1fe4c481 YC |
555 | { |
556 | struct tcp_metrics_block *tm; | |
557 | ||
558 | rcu_read_lock(); | |
559 | tm = tcp_get_metrics(sk, __sk_dst_get(sk), false); | |
560 | if (tm) { | |
561 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; | |
562 | unsigned int seq; | |
563 | ||
564 | do { | |
565 | seq = read_seqbegin(&fastopen_seqlock); | |
566 | if (tfom->mss) | |
567 | *mss = tfom->mss; | |
568 | *cookie = tfom->cookie; | |
2646c831 DL |
569 | if (cookie->len <= 0 && tfom->try_exp == 1) |
570 | cookie->exp = true; | |
aab48743 YC |
571 | *syn_loss = tfom->syn_loss; |
572 | *last_syn_loss = *syn_loss ? tfom->last_syn_loss : 0; | |
1fe4c481 YC |
573 | } while (read_seqretry(&fastopen_seqlock, seq)); |
574 | } | |
575 | rcu_read_unlock(); | |
576 | } | |
577 | ||
1fe4c481 | 578 | void tcp_fastopen_cache_set(struct sock *sk, u16 mss, |
2646c831 DL |
579 | struct tcp_fastopen_cookie *cookie, bool syn_lost, |
580 | u16 try_exp) | |
1fe4c481 | 581 | { |
dccf76ca | 582 | struct dst_entry *dst = __sk_dst_get(sk); |
1fe4c481 YC |
583 | struct tcp_metrics_block *tm; |
584 | ||
dccf76ca ED |
585 | if (!dst) |
586 | return; | |
1fe4c481 | 587 | rcu_read_lock(); |
dccf76ca | 588 | tm = tcp_get_metrics(sk, dst, true); |
1fe4c481 YC |
589 | if (tm) { |
590 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; | |
591 | ||
592 | write_seqlock_bh(&fastopen_seqlock); | |
c968601d YC |
593 | if (mss) |
594 | tfom->mss = mss; | |
595 | if (cookie && cookie->len > 0) | |
1fe4c481 | 596 | tfom->cookie = *cookie; |
2646c831 DL |
597 | else if (try_exp > tfom->try_exp && |
598 | tfom->cookie.len <= 0 && !tfom->cookie.exp) | |
599 | tfom->try_exp = try_exp; | |
aab48743 YC |
600 | if (syn_lost) { |
601 | ++tfom->syn_loss; | |
602 | tfom->last_syn_loss = jiffies; | |
603 | } else | |
604 | tfom->syn_loss = 0; | |
1fe4c481 YC |
605 | write_sequnlock_bh(&fastopen_seqlock); |
606 | } | |
607 | rcu_read_unlock(); | |
608 | } | |
609 | ||
489111e5 | 610 | static struct genl_family tcp_metrics_nl_family; |
d23ff701 | 611 | |
4f70c96f | 612 | static const struct nla_policy tcp_metrics_nl_policy[TCP_METRICS_ATTR_MAX + 1] = { |
d23ff701 JA |
613 | [TCP_METRICS_ATTR_ADDR_IPV4] = { .type = NLA_U32, }, |
614 | [TCP_METRICS_ATTR_ADDR_IPV6] = { .type = NLA_BINARY, | |
615 | .len = sizeof(struct in6_addr), }, | |
616 | /* Following attributes are not received for GET/DEL, | |
617 | * we keep them for reference | |
618 | */ | |
619 | #if 0 | |
620 | [TCP_METRICS_ATTR_AGE] = { .type = NLA_MSECS, }, | |
621 | [TCP_METRICS_ATTR_TW_TSVAL] = { .type = NLA_U32, }, | |
622 | [TCP_METRICS_ATTR_TW_TS_STAMP] = { .type = NLA_S32, }, | |
623 | [TCP_METRICS_ATTR_VALS] = { .type = NLA_NESTED, }, | |
624 | [TCP_METRICS_ATTR_FOPEN_MSS] = { .type = NLA_U16, }, | |
625 | [TCP_METRICS_ATTR_FOPEN_SYN_DROPS] = { .type = NLA_U16, }, | |
626 | [TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS] = { .type = NLA_MSECS, }, | |
627 | [TCP_METRICS_ATTR_FOPEN_COOKIE] = { .type = NLA_BINARY, | |
628 | .len = TCP_FASTOPEN_COOKIE_MAX, }, | |
629 | #endif | |
630 | }; | |
631 | ||
632 | /* Add attributes, caller cancels its header on failure */ | |
633 | static int tcp_metrics_fill_info(struct sk_buff *msg, | |
634 | struct tcp_metrics_block *tm) | |
635 | { | |
636 | struct nlattr *nest; | |
637 | int i; | |
638 | ||
324fd55a | 639 | switch (tm->tcpm_daddr.family) { |
d23ff701 | 640 | case AF_INET: |
930345ea | 641 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_ADDR_IPV4, |
3abef286 | 642 | inetpeer_get_addr_v4(&tm->tcpm_daddr)) < 0) |
d23ff701 | 643 | goto nla_put_failure; |
930345ea | 644 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_SADDR_IPV4, |
3abef286 | 645 | inetpeer_get_addr_v4(&tm->tcpm_saddr)) < 0) |
8a59359c | 646 | goto nla_put_failure; |
d23ff701 JA |
647 | break; |
648 | case AF_INET6: | |
930345ea | 649 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_ADDR_IPV6, |
3abef286 | 650 | inetpeer_get_addr_v6(&tm->tcpm_daddr)) < 0) |
d23ff701 | 651 | goto nla_put_failure; |
930345ea | 652 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_SADDR_IPV6, |
3abef286 | 653 | inetpeer_get_addr_v6(&tm->tcpm_saddr)) < 0) |
8a59359c | 654 | goto nla_put_failure; |
d23ff701 JA |
655 | break; |
656 | default: | |
657 | return -EAFNOSUPPORT; | |
658 | } | |
659 | ||
660 | if (nla_put_msecs(msg, TCP_METRICS_ATTR_AGE, | |
2175d87c ND |
661 | jiffies - tm->tcpm_stamp, |
662 | TCP_METRICS_ATTR_PAD) < 0) | |
d23ff701 | 663 | goto nla_put_failure; |
d23ff701 JA |
664 | |
665 | { | |
666 | int n = 0; | |
667 | ||
668 | nest = nla_nest_start(msg, TCP_METRICS_ATTR_VALS); | |
669 | if (!nest) | |
670 | goto nla_put_failure; | |
740b0f18 ED |
671 | for (i = 0; i < TCP_METRIC_MAX_KERNEL + 1; i++) { |
672 | u32 val = tm->tcpm_vals[i]; | |
673 | ||
674 | if (!val) | |
d23ff701 | 675 | continue; |
740b0f18 ED |
676 | if (i == TCP_METRIC_RTT) { |
677 | if (nla_put_u32(msg, TCP_METRIC_RTT_US + 1, | |
678 | val) < 0) | |
679 | goto nla_put_failure; | |
680 | n++; | |
681 | val = max(val / 1000, 1U); | |
682 | } | |
683 | if (i == TCP_METRIC_RTTVAR) { | |
684 | if (nla_put_u32(msg, TCP_METRIC_RTTVAR_US + 1, | |
685 | val) < 0) | |
686 | goto nla_put_failure; | |
687 | n++; | |
688 | val = max(val / 1000, 1U); | |
689 | } | |
690 | if (nla_put_u32(msg, i + 1, val) < 0) | |
d23ff701 JA |
691 | goto nla_put_failure; |
692 | n++; | |
693 | } | |
694 | if (n) | |
695 | nla_nest_end(msg, nest); | |
696 | else | |
697 | nla_nest_cancel(msg, nest); | |
698 | } | |
699 | ||
700 | { | |
701 | struct tcp_fastopen_metrics tfom_copy[1], *tfom; | |
702 | unsigned int seq; | |
703 | ||
704 | do { | |
705 | seq = read_seqbegin(&fastopen_seqlock); | |
706 | tfom_copy[0] = tm->tcpm_fastopen; | |
707 | } while (read_seqretry(&fastopen_seqlock, seq)); | |
708 | ||
709 | tfom = tfom_copy; | |
710 | if (tfom->mss && | |
711 | nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_MSS, | |
712 | tfom->mss) < 0) | |
713 | goto nla_put_failure; | |
714 | if (tfom->syn_loss && | |
715 | (nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROPS, | |
716 | tfom->syn_loss) < 0 || | |
717 | nla_put_msecs(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS, | |
2175d87c ND |
718 | jiffies - tfom->last_syn_loss, |
719 | TCP_METRICS_ATTR_PAD) < 0)) | |
d23ff701 JA |
720 | goto nla_put_failure; |
721 | if (tfom->cookie.len > 0 && | |
722 | nla_put(msg, TCP_METRICS_ATTR_FOPEN_COOKIE, | |
723 | tfom->cookie.len, tfom->cookie.val) < 0) | |
724 | goto nla_put_failure; | |
725 | } | |
726 | ||
727 | return 0; | |
728 | ||
729 | nla_put_failure: | |
730 | return -EMSGSIZE; | |
731 | } | |
732 | ||
733 | static int tcp_metrics_dump_info(struct sk_buff *skb, | |
734 | struct netlink_callback *cb, | |
735 | struct tcp_metrics_block *tm) | |
736 | { | |
737 | void *hdr; | |
738 | ||
15e47304 | 739 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
d23ff701 JA |
740 | &tcp_metrics_nl_family, NLM_F_MULTI, |
741 | TCP_METRICS_CMD_GET); | |
742 | if (!hdr) | |
743 | return -EMSGSIZE; | |
744 | ||
745 | if (tcp_metrics_fill_info(skb, tm) < 0) | |
746 | goto nla_put_failure; | |
747 | ||
053c095a JB |
748 | genlmsg_end(skb, hdr); |
749 | return 0; | |
d23ff701 JA |
750 | |
751 | nla_put_failure: | |
752 | genlmsg_cancel(skb, hdr); | |
753 | return -EMSGSIZE; | |
754 | } | |
755 | ||
756 | static int tcp_metrics_nl_dump(struct sk_buff *skb, | |
757 | struct netlink_callback *cb) | |
758 | { | |
759 | struct net *net = sock_net(skb->sk); | |
098a697b | 760 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
d23ff701 JA |
761 | unsigned int row, s_row = cb->args[0]; |
762 | int s_col = cb->args[1], col = s_col; | |
763 | ||
764 | for (row = s_row; row < max_rows; row++, s_col = 0) { | |
765 | struct tcp_metrics_block *tm; | |
098a697b | 766 | struct tcpm_hash_bucket *hb = tcp_metrics_hash + row; |
d23ff701 JA |
767 | |
768 | rcu_read_lock(); | |
769 | for (col = 0, tm = rcu_dereference(hb->chain); tm; | |
770 | tm = rcu_dereference(tm->tcpm_next), col++) { | |
849e8a0c EB |
771 | if (!net_eq(tm_net(tm), net)) |
772 | continue; | |
d23ff701 JA |
773 | if (col < s_col) |
774 | continue; | |
775 | if (tcp_metrics_dump_info(skb, cb, tm) < 0) { | |
776 | rcu_read_unlock(); | |
777 | goto done; | |
778 | } | |
779 | } | |
780 | rcu_read_unlock(); | |
781 | } | |
782 | ||
783 | done: | |
784 | cb->args[0] = row; | |
785 | cb->args[1] = col; | |
786 | return skb->len; | |
787 | } | |
788 | ||
3e7013dd CP |
789 | static int __parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
790 | unsigned int *hash, int optional, int v4, int v6) | |
d23ff701 JA |
791 | { |
792 | struct nlattr *a; | |
793 | ||
3e7013dd | 794 | a = info->attrs[v4]; |
d23ff701 | 795 | if (a) { |
3abef286 | 796 | inetpeer_set_addr_v4(addr, nla_get_in_addr(a)); |
3e7013dd | 797 | if (hash) |
3abef286 | 798 | *hash = ipv4_addr_hash(inetpeer_get_addr_v4(addr)); |
d23ff701 JA |
799 | return 0; |
800 | } | |
3e7013dd | 801 | a = info->attrs[v6]; |
d23ff701 | 802 | if (a) { |
3abef286 DA |
803 | struct in6_addr in6; |
804 | ||
2c42a3fb | 805 | if (nla_len(a) != sizeof(struct in6_addr)) |
d23ff701 | 806 | return -EINVAL; |
3abef286 DA |
807 | in6 = nla_get_in6_addr(a); |
808 | inetpeer_set_addr_v6(addr, &in6); | |
3e7013dd | 809 | if (hash) |
3abef286 | 810 | *hash = ipv6_addr_hash(inetpeer_get_addr_v6(addr)); |
d23ff701 JA |
811 | return 0; |
812 | } | |
813 | return optional ? 1 : -EAFNOSUPPORT; | |
814 | } | |
815 | ||
3e7013dd CP |
816 | static int parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
817 | unsigned int *hash, int optional) | |
818 | { | |
819 | return __parse_nl_addr(info, addr, hash, optional, | |
820 | TCP_METRICS_ATTR_ADDR_IPV4, | |
821 | TCP_METRICS_ATTR_ADDR_IPV6); | |
822 | } | |
823 | ||
824 | static int parse_nl_saddr(struct genl_info *info, struct inetpeer_addr *addr) | |
825 | { | |
826 | return __parse_nl_addr(info, addr, NULL, 0, | |
827 | TCP_METRICS_ATTR_SADDR_IPV4, | |
828 | TCP_METRICS_ATTR_SADDR_IPV6); | |
829 | } | |
830 | ||
d23ff701 JA |
831 | static int tcp_metrics_nl_cmd_get(struct sk_buff *skb, struct genl_info *info) |
832 | { | |
833 | struct tcp_metrics_block *tm; | |
3e7013dd | 834 | struct inetpeer_addr saddr, daddr; |
d23ff701 JA |
835 | unsigned int hash; |
836 | struct sk_buff *msg; | |
837 | struct net *net = genl_info_net(info); | |
838 | void *reply; | |
839 | int ret; | |
3e7013dd | 840 | bool src = true; |
d23ff701 | 841 | |
324fd55a | 842 | ret = parse_nl_addr(info, &daddr, &hash, 0); |
d23ff701 JA |
843 | if (ret < 0) |
844 | return ret; | |
845 | ||
3e7013dd CP |
846 | ret = parse_nl_saddr(info, &saddr); |
847 | if (ret < 0) | |
848 | src = false; | |
849 | ||
d23ff701 JA |
850 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
851 | if (!msg) | |
852 | return -ENOMEM; | |
853 | ||
854 | reply = genlmsg_put_reply(msg, info, &tcp_metrics_nl_family, 0, | |
855 | info->genlhdr->cmd); | |
856 | if (!reply) | |
857 | goto nla_put_failure; | |
858 | ||
3e5da62d | 859 | hash ^= net_hash_mix(net); |
098a697b | 860 | hash = hash_32(hash, tcp_metrics_hash_log); |
d23ff701 JA |
861 | ret = -ESRCH; |
862 | rcu_read_lock(); | |
098a697b | 863 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
d23ff701 | 864 | tm = rcu_dereference(tm->tcpm_next)) { |
3e7013dd | 865 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
849e8a0c EB |
866 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
867 | net_eq(tm_net(tm), net)) { | |
d23ff701 JA |
868 | ret = tcp_metrics_fill_info(msg, tm); |
869 | break; | |
870 | } | |
871 | } | |
872 | rcu_read_unlock(); | |
873 | if (ret < 0) | |
874 | goto out_free; | |
875 | ||
876 | genlmsg_end(msg, reply); | |
877 | return genlmsg_reply(msg, info); | |
878 | ||
879 | nla_put_failure: | |
880 | ret = -EMSGSIZE; | |
881 | ||
882 | out_free: | |
883 | nlmsg_free(msg); | |
884 | return ret; | |
885 | } | |
886 | ||
8a4bff71 | 887 | static void tcp_metrics_flush_all(struct net *net) |
d23ff701 | 888 | { |
098a697b EB |
889 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
890 | struct tcpm_hash_bucket *hb = tcp_metrics_hash; | |
d23ff701 JA |
891 | struct tcp_metrics_block *tm; |
892 | unsigned int row; | |
893 | ||
894 | for (row = 0; row < max_rows; row++, hb++) { | |
04f721c6 | 895 | struct tcp_metrics_block __rcu **pp; |
d23ff701 | 896 | spin_lock_bh(&tcp_metrics_lock); |
04f721c6 | 897 | pp = &hb->chain; |
9f1ab186 | 898 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
04f721c6 EB |
899 | if (net_eq(tm_net(tm), net)) { |
900 | *pp = tm->tcpm_next; | |
901 | kfree_rcu(tm, rcu_head); | |
902 | } else { | |
903 | pp = &tm->tcpm_next; | |
904 | } | |
d23ff701 | 905 | } |
04f721c6 | 906 | spin_unlock_bh(&tcp_metrics_lock); |
d23ff701 | 907 | } |
d23ff701 JA |
908 | } |
909 | ||
910 | static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
911 | { | |
912 | struct tcpm_hash_bucket *hb; | |
00ca9c5b | 913 | struct tcp_metrics_block *tm; |
d23ff701 | 914 | struct tcp_metrics_block __rcu **pp; |
3e7013dd | 915 | struct inetpeer_addr saddr, daddr; |
d23ff701 JA |
916 | unsigned int hash; |
917 | struct net *net = genl_info_net(info); | |
918 | int ret; | |
00ca9c5b | 919 | bool src = true, found = false; |
d23ff701 | 920 | |
324fd55a | 921 | ret = parse_nl_addr(info, &daddr, &hash, 1); |
d23ff701 JA |
922 | if (ret < 0) |
923 | return ret; | |
8a4bff71 EB |
924 | if (ret > 0) { |
925 | tcp_metrics_flush_all(net); | |
926 | return 0; | |
927 | } | |
3e7013dd CP |
928 | ret = parse_nl_saddr(info, &saddr); |
929 | if (ret < 0) | |
930 | src = false; | |
d23ff701 | 931 | |
3e5da62d | 932 | hash ^= net_hash_mix(net); |
098a697b EB |
933 | hash = hash_32(hash, tcp_metrics_hash_log); |
934 | hb = tcp_metrics_hash + hash; | |
d23ff701 JA |
935 | pp = &hb->chain; |
936 | spin_lock_bh(&tcp_metrics_lock); | |
9f1ab186 | 937 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
3e7013dd | 938 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
849e8a0c EB |
939 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
940 | net_eq(tm_net(tm), net)) { | |
d23ff701 | 941 | *pp = tm->tcpm_next; |
00ca9c5b CP |
942 | kfree_rcu(tm, rcu_head); |
943 | found = true; | |
bbf852b9 CP |
944 | } else { |
945 | pp = &tm->tcpm_next; | |
d23ff701 JA |
946 | } |
947 | } | |
948 | spin_unlock_bh(&tcp_metrics_lock); | |
00ca9c5b | 949 | if (!found) |
d23ff701 | 950 | return -ESRCH; |
d23ff701 JA |
951 | return 0; |
952 | } | |
953 | ||
4534de83 | 954 | static const struct genl_ops tcp_metrics_nl_ops[] = { |
d23ff701 JA |
955 | { |
956 | .cmd = TCP_METRICS_CMD_GET, | |
957 | .doit = tcp_metrics_nl_cmd_get, | |
958 | .dumpit = tcp_metrics_nl_dump, | |
959 | .policy = tcp_metrics_nl_policy, | |
d23ff701 JA |
960 | }, |
961 | { | |
962 | .cmd = TCP_METRICS_CMD_DEL, | |
963 | .doit = tcp_metrics_nl_cmd_del, | |
964 | .policy = tcp_metrics_nl_policy, | |
965 | .flags = GENL_ADMIN_PERM, | |
966 | }, | |
967 | }; | |
968 | ||
56989f6d | 969 | static struct genl_family tcp_metrics_nl_family __ro_after_init = { |
489111e5 JB |
970 | .hdrsize = 0, |
971 | .name = TCP_METRICS_GENL_NAME, | |
972 | .version = TCP_METRICS_GENL_VERSION, | |
973 | .maxattr = TCP_METRICS_ATTR_MAX, | |
974 | .netnsok = true, | |
975 | .module = THIS_MODULE, | |
976 | .ops = tcp_metrics_nl_ops, | |
977 | .n_ops = ARRAY_SIZE(tcp_metrics_nl_ops), | |
978 | }; | |
979 | ||
5815d5e7 | 980 | static unsigned int tcpmhash_entries; |
51c5d0c4 DM |
981 | static int __init set_tcpmhash_entries(char *str) |
982 | { | |
983 | ssize_t ret; | |
984 | ||
985 | if (!str) | |
986 | return 0; | |
987 | ||
5815d5e7 | 988 | ret = kstrtouint(str, 0, &tcpmhash_entries); |
51c5d0c4 DM |
989 | if (ret) |
990 | return 0; | |
991 | ||
992 | return 1; | |
993 | } | |
994 | __setup("tcpmhash_entries=", set_tcpmhash_entries); | |
995 | ||
996 | static int __net_init tcp_net_metrics_init(struct net *net) | |
997 | { | |
5815d5e7 ED |
998 | size_t size; |
999 | unsigned int slots; | |
51c5d0c4 | 1000 | |
098a697b EB |
1001 | if (!net_eq(net, &init_net)) |
1002 | return 0; | |
1003 | ||
51c5d0c4 DM |
1004 | slots = tcpmhash_entries; |
1005 | if (!slots) { | |
1006 | if (totalram_pages >= 128 * 1024) | |
1007 | slots = 16 * 1024; | |
1008 | else | |
1009 | slots = 8 * 1024; | |
1010 | } | |
1011 | ||
098a697b EB |
1012 | tcp_metrics_hash_log = order_base_2(slots); |
1013 | size = sizeof(struct tcpm_hash_bucket) << tcp_metrics_hash_log; | |
51c5d0c4 | 1014 | |
752ade68 | 1015 | tcp_metrics_hash = kvzalloc(size, GFP_KERNEL); |
098a697b | 1016 | if (!tcp_metrics_hash) |
51c5d0c4 DM |
1017 | return -ENOMEM; |
1018 | ||
51c5d0c4 DM |
1019 | return 0; |
1020 | } | |
1021 | ||
1022 | static void __net_exit tcp_net_metrics_exit(struct net *net) | |
1023 | { | |
098a697b | 1024 | tcp_metrics_flush_all(net); |
51c5d0c4 DM |
1025 | } |
1026 | ||
1027 | static __net_initdata struct pernet_operations tcp_net_metrics_ops = { | |
1028 | .init = tcp_net_metrics_init, | |
1029 | .exit = tcp_net_metrics_exit, | |
1030 | }; | |
1031 | ||
1032 | void __init tcp_metrics_init(void) | |
1033 | { | |
d23ff701 JA |
1034 | int ret; |
1035 | ||
1036 | ret = register_pernet_subsys(&tcp_net_metrics_ops); | |
1037 | if (ret < 0) | |
6493517e EB |
1038 | panic("Could not allocate the tcp_metrics hash table\n"); |
1039 | ||
489111e5 | 1040 | ret = genl_register_family(&tcp_metrics_nl_family); |
d23ff701 | 1041 | if (ret < 0) |
6493517e | 1042 | panic("Could not register tcp_metrics generic netlink\n"); |
51c5d0c4 | 1043 | } |