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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 | 23 | |
41804420 DM |
24 | static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr, |
25 | const struct inetpeer_addr *daddr, | |
77f99ad1 CP |
26 | struct net *net, unsigned int hash); |
27 | ||
1fe4c481 YC |
28 | struct tcp_fastopen_metrics { |
29 | u16 mss; | |
2646c831 DL |
30 | u16 syn_loss:10, /* Recurring Fast Open SYN losses */ |
31 | try_exp:2; /* Request w/ exp. option (once) */ | |
aab48743 | 32 | unsigned long last_syn_loss; /* Last Fast Open SYN loss */ |
1fe4c481 YC |
33 | struct tcp_fastopen_cookie cookie; |
34 | }; | |
35 | ||
740b0f18 ED |
36 | /* TCP_METRIC_MAX includes 2 extra fields for userspace compatibility |
37 | * Kernel only stores RTT and RTTVAR in usec resolution | |
38 | */ | |
39 | #define TCP_METRIC_MAX_KERNEL (TCP_METRIC_MAX - 2) | |
40 | ||
51c5d0c4 DM |
41 | struct tcp_metrics_block { |
42 | struct tcp_metrics_block __rcu *tcpm_next; | |
849e8a0c | 43 | possible_net_t tcpm_net; |
a5443028 | 44 | struct inetpeer_addr tcpm_saddr; |
324fd55a | 45 | struct inetpeer_addr tcpm_daddr; |
51c5d0c4 DM |
46 | unsigned long tcpm_stamp; |
47 | u32 tcpm_lock; | |
740b0f18 | 48 | u32 tcpm_vals[TCP_METRIC_MAX_KERNEL + 1]; |
1fe4c481 | 49 | struct tcp_fastopen_metrics tcpm_fastopen; |
d23ff701 JA |
50 | |
51 | struct rcu_head rcu_head; | |
51c5d0c4 DM |
52 | }; |
53 | ||
849e8a0c EB |
54 | static inline struct net *tm_net(struct tcp_metrics_block *tm) |
55 | { | |
56 | return read_pnet(&tm->tcpm_net); | |
57 | } | |
58 | ||
51c5d0c4 DM |
59 | static bool tcp_metric_locked(struct tcp_metrics_block *tm, |
60 | enum tcp_metric_index idx) | |
61 | { | |
62 | return tm->tcpm_lock & (1 << idx); | |
63 | } | |
64 | ||
65 | static u32 tcp_metric_get(struct tcp_metrics_block *tm, | |
66 | enum tcp_metric_index idx) | |
67 | { | |
68 | return tm->tcpm_vals[idx]; | |
69 | } | |
70 | ||
51c5d0c4 DM |
71 | static void tcp_metric_set(struct tcp_metrics_block *tm, |
72 | enum tcp_metric_index idx, | |
73 | u32 val) | |
74 | { | |
75 | tm->tcpm_vals[idx] = val; | |
76 | } | |
77 | ||
51c5d0c4 DM |
78 | static bool addr_same(const struct inetpeer_addr *a, |
79 | const struct inetpeer_addr *b) | |
80 | { | |
d39d14ff | 81 | return inetpeer_addr_cmp(a, b) == 0; |
51c5d0c4 DM |
82 | } |
83 | ||
84 | struct tcpm_hash_bucket { | |
85 | struct tcp_metrics_block __rcu *chain; | |
86 | }; | |
87 | ||
098a697b EB |
88 | static struct tcpm_hash_bucket *tcp_metrics_hash __read_mostly; |
89 | static unsigned int tcp_metrics_hash_log __read_mostly; | |
90 | ||
51c5d0c4 DM |
91 | static DEFINE_SPINLOCK(tcp_metrics_lock); |
92 | ||
740b0f18 ED |
93 | static void tcpm_suck_dst(struct tcp_metrics_block *tm, |
94 | const struct dst_entry *dst, | |
efeaa555 | 95 | bool fastopen_clear) |
51c5d0c4 | 96 | { |
740b0f18 | 97 | u32 msval; |
51c5d0c4 DM |
98 | u32 val; |
99 | ||
9a0a9502 JA |
100 | tm->tcpm_stamp = jiffies; |
101 | ||
51c5d0c4 DM |
102 | val = 0; |
103 | if (dst_metric_locked(dst, RTAX_RTT)) | |
104 | val |= 1 << TCP_METRIC_RTT; | |
105 | if (dst_metric_locked(dst, RTAX_RTTVAR)) | |
106 | val |= 1 << TCP_METRIC_RTTVAR; | |
107 | if (dst_metric_locked(dst, RTAX_SSTHRESH)) | |
108 | val |= 1 << TCP_METRIC_SSTHRESH; | |
109 | if (dst_metric_locked(dst, RTAX_CWND)) | |
110 | val |= 1 << TCP_METRIC_CWND; | |
111 | if (dst_metric_locked(dst, RTAX_REORDERING)) | |
112 | val |= 1 << TCP_METRIC_REORDERING; | |
113 | tm->tcpm_lock = val; | |
114 | ||
740b0f18 ED |
115 | msval = dst_metric_raw(dst, RTAX_RTT); |
116 | tm->tcpm_vals[TCP_METRIC_RTT] = msval * USEC_PER_MSEC; | |
117 | ||
118 | msval = dst_metric_raw(dst, RTAX_RTTVAR); | |
119 | tm->tcpm_vals[TCP_METRIC_RTTVAR] = msval * USEC_PER_MSEC; | |
51c5d0c4 DM |
120 | tm->tcpm_vals[TCP_METRIC_SSTHRESH] = dst_metric_raw(dst, RTAX_SSTHRESH); |
121 | tm->tcpm_vals[TCP_METRIC_CWND] = dst_metric_raw(dst, RTAX_CWND); | |
122 | tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING); | |
efeaa555 ED |
123 | if (fastopen_clear) { |
124 | tm->tcpm_fastopen.mss = 0; | |
125 | tm->tcpm_fastopen.syn_loss = 0; | |
2646c831 DL |
126 | tm->tcpm_fastopen.try_exp = 0; |
127 | tm->tcpm_fastopen.cookie.exp = false; | |
efeaa555 ED |
128 | tm->tcpm_fastopen.cookie.len = 0; |
129 | } | |
51c5d0c4 DM |
130 | } |
131 | ||
77f99ad1 CP |
132 | #define TCP_METRICS_TIMEOUT (60 * 60 * HZ) |
133 | ||
134 | static void tcpm_check_stamp(struct tcp_metrics_block *tm, struct dst_entry *dst) | |
135 | { | |
136 | if (tm && unlikely(time_after(jiffies, tm->tcpm_stamp + TCP_METRICS_TIMEOUT))) | |
137 | tcpm_suck_dst(tm, dst, false); | |
138 | } | |
139 | ||
140 | #define TCP_METRICS_RECLAIM_DEPTH 5 | |
141 | #define TCP_METRICS_RECLAIM_PTR (struct tcp_metrics_block *) 0x1UL | |
142 | ||
9f1ab186 ED |
143 | #define deref_locked(p) \ |
144 | rcu_dereference_protected(p, lockdep_is_held(&tcp_metrics_lock)) | |
145 | ||
51c5d0c4 | 146 | static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst, |
a5443028 | 147 | struct inetpeer_addr *saddr, |
324fd55a | 148 | struct inetpeer_addr *daddr, |
77f99ad1 | 149 | unsigned int hash) |
51c5d0c4 DM |
150 | { |
151 | struct tcp_metrics_block *tm; | |
152 | struct net *net; | |
77f99ad1 | 153 | bool reclaim = false; |
51c5d0c4 DM |
154 | |
155 | spin_lock_bh(&tcp_metrics_lock); | |
156 | net = dev_net(dst->dev); | |
77f99ad1 CP |
157 | |
158 | /* While waiting for the spin-lock the cache might have been populated | |
159 | * with this entry and so we have to check again. | |
160 | */ | |
41804420 | 161 | tm = __tcp_get_metrics(saddr, daddr, net, hash); |
77f99ad1 CP |
162 | if (tm == TCP_METRICS_RECLAIM_PTR) { |
163 | reclaim = true; | |
164 | tm = NULL; | |
165 | } | |
166 | if (tm) { | |
167 | tcpm_check_stamp(tm, dst); | |
168 | goto out_unlock; | |
169 | } | |
170 | ||
51c5d0c4 DM |
171 | if (unlikely(reclaim)) { |
172 | struct tcp_metrics_block *oldest; | |
173 | ||
9f1ab186 ED |
174 | oldest = deref_locked(tcp_metrics_hash[hash].chain); |
175 | for (tm = deref_locked(oldest->tcpm_next); tm; | |
176 | tm = deref_locked(tm->tcpm_next)) { | |
51c5d0c4 DM |
177 | if (time_before(tm->tcpm_stamp, oldest->tcpm_stamp)) |
178 | oldest = tm; | |
179 | } | |
180 | tm = oldest; | |
181 | } else { | |
182 | tm = kmalloc(sizeof(*tm), GFP_ATOMIC); | |
183 | if (!tm) | |
184 | goto out_unlock; | |
185 | } | |
849e8a0c | 186 | write_pnet(&tm->tcpm_net, net); |
a5443028 | 187 | tm->tcpm_saddr = *saddr; |
324fd55a | 188 | tm->tcpm_daddr = *daddr; |
51c5d0c4 | 189 | |
efeaa555 | 190 | tcpm_suck_dst(tm, dst, true); |
51c5d0c4 DM |
191 | |
192 | if (likely(!reclaim)) { | |
098a697b EB |
193 | tm->tcpm_next = tcp_metrics_hash[hash].chain; |
194 | rcu_assign_pointer(tcp_metrics_hash[hash].chain, tm); | |
51c5d0c4 DM |
195 | } |
196 | ||
197 | out_unlock: | |
198 | spin_unlock_bh(&tcp_metrics_lock); | |
199 | return tm; | |
200 | } | |
201 | ||
51c5d0c4 DM |
202 | static struct tcp_metrics_block *tcp_get_encode(struct tcp_metrics_block *tm, int depth) |
203 | { | |
204 | if (tm) | |
205 | return tm; | |
206 | if (depth > TCP_METRICS_RECLAIM_DEPTH) | |
207 | return TCP_METRICS_RECLAIM_PTR; | |
208 | return NULL; | |
209 | } | |
210 | ||
a5443028 CP |
211 | static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr, |
212 | const struct inetpeer_addr *daddr, | |
51c5d0c4 DM |
213 | struct net *net, unsigned int hash) |
214 | { | |
215 | struct tcp_metrics_block *tm; | |
216 | int depth = 0; | |
217 | ||
098a697b | 218 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
51c5d0c4 | 219 | tm = rcu_dereference(tm->tcpm_next)) { |
a5443028 | 220 | if (addr_same(&tm->tcpm_saddr, saddr) && |
849e8a0c EB |
221 | addr_same(&tm->tcpm_daddr, daddr) && |
222 | net_eq(tm_net(tm), net)) | |
51c5d0c4 DM |
223 | break; |
224 | depth++; | |
225 | } | |
226 | return tcp_get_encode(tm, depth); | |
227 | } | |
228 | ||
229 | static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req, | |
230 | struct dst_entry *dst) | |
231 | { | |
232 | struct tcp_metrics_block *tm; | |
a5443028 | 233 | struct inetpeer_addr saddr, daddr; |
51c5d0c4 DM |
234 | unsigned int hash; |
235 | struct net *net; | |
236 | ||
a5443028 | 237 | saddr.family = req->rsk_ops->family; |
324fd55a CP |
238 | daddr.family = req->rsk_ops->family; |
239 | switch (daddr.family) { | |
51c5d0c4 | 240 | case AF_INET: |
3abef286 DA |
241 | inetpeer_set_addr_v4(&saddr, inet_rsk(req)->ir_loc_addr); |
242 | inetpeer_set_addr_v4(&daddr, inet_rsk(req)->ir_rmt_addr); | |
72afa352 | 243 | hash = ipv4_addr_hash(inet_rsk(req)->ir_rmt_addr); |
51c5d0c4 | 244 | break; |
634fb979 | 245 | #if IS_ENABLED(CONFIG_IPV6) |
51c5d0c4 | 246 | case AF_INET6: |
3abef286 DA |
247 | inetpeer_set_addr_v6(&saddr, &inet_rsk(req)->ir_v6_loc_addr); |
248 | inetpeer_set_addr_v6(&daddr, &inet_rsk(req)->ir_v6_rmt_addr); | |
634fb979 | 249 | hash = ipv6_addr_hash(&inet_rsk(req)->ir_v6_rmt_addr); |
51c5d0c4 | 250 | break; |
634fb979 | 251 | #endif |
51c5d0c4 DM |
252 | default: |
253 | return NULL; | |
254 | } | |
255 | ||
51c5d0c4 | 256 | net = dev_net(dst->dev); |
3e5da62d | 257 | hash ^= net_hash_mix(net); |
098a697b | 258 | hash = hash_32(hash, tcp_metrics_hash_log); |
51c5d0c4 | 259 | |
098a697b | 260 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
51c5d0c4 | 261 | tm = rcu_dereference(tm->tcpm_next)) { |
a5443028 | 262 | if (addr_same(&tm->tcpm_saddr, &saddr) && |
849e8a0c EB |
263 | addr_same(&tm->tcpm_daddr, &daddr) && |
264 | net_eq(tm_net(tm), net)) | |
51c5d0c4 DM |
265 | break; |
266 | } | |
267 | tcpm_check_stamp(tm, dst); | |
268 | return tm; | |
269 | } | |
270 | ||
271 | static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk, | |
272 | struct dst_entry *dst, | |
273 | bool create) | |
274 | { | |
275 | struct tcp_metrics_block *tm; | |
a5443028 | 276 | struct inetpeer_addr saddr, daddr; |
51c5d0c4 DM |
277 | unsigned int hash; |
278 | struct net *net; | |
51c5d0c4 | 279 | |
3ad88cf7 | 280 | if (sk->sk_family == AF_INET) { |
3abef286 DA |
281 | inetpeer_set_addr_v4(&saddr, inet_sk(sk)->inet_saddr); |
282 | inetpeer_set_addr_v4(&daddr, inet_sk(sk)->inet_daddr); | |
72afa352 | 283 | hash = ipv4_addr_hash(inet_sk(sk)->inet_daddr); |
3ad88cf7 | 284 | } |
c2bb06db | 285 | #if IS_ENABLED(CONFIG_IPV6) |
3ad88cf7 CP |
286 | else if (sk->sk_family == AF_INET6) { |
287 | if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { | |
3abef286 DA |
288 | inetpeer_set_addr_v4(&saddr, inet_sk(sk)->inet_saddr); |
289 | inetpeer_set_addr_v4(&daddr, inet_sk(sk)->inet_daddr); | |
72afa352 | 290 | hash = ipv4_addr_hash(inet_sk(sk)->inet_daddr); |
3ad88cf7 | 291 | } else { |
3abef286 DA |
292 | inetpeer_set_addr_v6(&saddr, &sk->sk_v6_rcv_saddr); |
293 | inetpeer_set_addr_v6(&daddr, &sk->sk_v6_daddr); | |
3ad88cf7 CP |
294 | hash = ipv6_addr_hash(&sk->sk_v6_daddr); |
295 | } | |
296 | } | |
c2bb06db | 297 | #endif |
3ad88cf7 | 298 | else |
51c5d0c4 | 299 | return NULL; |
51c5d0c4 | 300 | |
51c5d0c4 | 301 | net = dev_net(dst->dev); |
3e5da62d | 302 | hash ^= net_hash_mix(net); |
098a697b | 303 | hash = hash_32(hash, tcp_metrics_hash_log); |
51c5d0c4 | 304 | |
a5443028 | 305 | tm = __tcp_get_metrics(&saddr, &daddr, net, hash); |
77f99ad1 | 306 | if (tm == TCP_METRICS_RECLAIM_PTR) |
51c5d0c4 | 307 | tm = NULL; |
51c5d0c4 | 308 | if (!tm && create) |
41804420 | 309 | tm = tcpm_new(dst, &saddr, &daddr, hash); |
51c5d0c4 DM |
310 | else |
311 | tcpm_check_stamp(tm, dst); | |
312 | ||
313 | return tm; | |
314 | } | |
315 | ||
4aabd8ef DM |
316 | /* Save metrics learned by this TCP session. This function is called |
317 | * only, when TCP finishes successfully i.e. when it enters TIME-WAIT | |
318 | * or goes from LAST-ACK to CLOSE. | |
319 | */ | |
320 | void tcp_update_metrics(struct sock *sk) | |
321 | { | |
51c5d0c4 | 322 | const struct inet_connection_sock *icsk = inet_csk(sk); |
4aabd8ef | 323 | struct dst_entry *dst = __sk_dst_get(sk); |
51c5d0c4 | 324 | struct tcp_sock *tp = tcp_sk(sk); |
1043e25f | 325 | struct net *net = sock_net(sk); |
51c5d0c4 DM |
326 | struct tcp_metrics_block *tm; |
327 | unsigned long rtt; | |
328 | u32 val; | |
329 | int m; | |
4aabd8ef | 330 | |
c3a2e837 | 331 | sk_dst_confirm(sk); |
ec36e416 | 332 | if (net->ipv4.sysctl_tcp_nometrics_save || !dst) |
4aabd8ef DM |
333 | return; |
334 | ||
51c5d0c4 | 335 | rcu_read_lock(); |
740b0f18 | 336 | if (icsk->icsk_backoff || !tp->srtt_us) { |
51c5d0c4 DM |
337 | /* This session failed to estimate rtt. Why? |
338 | * Probably, no packets returned in time. Reset our | |
339 | * results. | |
340 | */ | |
341 | tm = tcp_get_metrics(sk, dst, false); | |
342 | if (tm && !tcp_metric_locked(tm, TCP_METRIC_RTT)) | |
343 | tcp_metric_set(tm, TCP_METRIC_RTT, 0); | |
344 | goto out_unlock; | |
345 | } else | |
346 | tm = tcp_get_metrics(sk, dst, true); | |
4aabd8ef | 347 | |
51c5d0c4 DM |
348 | if (!tm) |
349 | goto out_unlock; | |
4aabd8ef | 350 | |
740b0f18 ED |
351 | rtt = tcp_metric_get(tm, TCP_METRIC_RTT); |
352 | m = rtt - tp->srtt_us; | |
4aabd8ef | 353 | |
51c5d0c4 DM |
354 | /* If newly calculated rtt larger than stored one, store new |
355 | * one. Otherwise, use EWMA. Remember, rtt overestimation is | |
356 | * always better than underestimation. | |
357 | */ | |
358 | if (!tcp_metric_locked(tm, TCP_METRIC_RTT)) { | |
359 | if (m <= 0) | |
740b0f18 | 360 | rtt = tp->srtt_us; |
51c5d0c4 DM |
361 | else |
362 | rtt -= (m >> 3); | |
740b0f18 | 363 | tcp_metric_set(tm, TCP_METRIC_RTT, rtt); |
51c5d0c4 | 364 | } |
4aabd8ef | 365 | |
51c5d0c4 DM |
366 | if (!tcp_metric_locked(tm, TCP_METRIC_RTTVAR)) { |
367 | unsigned long var; | |
4aabd8ef | 368 | |
51c5d0c4 DM |
369 | if (m < 0) |
370 | m = -m; | |
4aabd8ef | 371 | |
51c5d0c4 DM |
372 | /* Scale deviation to rttvar fixed point */ |
373 | m >>= 1; | |
740b0f18 ED |
374 | if (m < tp->mdev_us) |
375 | m = tp->mdev_us; | |
4aabd8ef | 376 | |
740b0f18 | 377 | var = tcp_metric_get(tm, TCP_METRIC_RTTVAR); |
51c5d0c4 DM |
378 | if (m >= var) |
379 | var = m; | |
380 | else | |
381 | var -= (var - m) >> 2; | |
4aabd8ef | 382 | |
740b0f18 | 383 | tcp_metric_set(tm, TCP_METRIC_RTTVAR, var); |
51c5d0c4 DM |
384 | } |
385 | ||
386 | if (tcp_in_initial_slowstart(tp)) { | |
387 | /* Slow start still did not finish. */ | |
388 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { | |
389 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); | |
390 | if (val && (tp->snd_cwnd >> 1) > val) | |
391 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
392 | tp->snd_cwnd >> 1); | |
393 | } | |
394 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { | |
395 | val = tcp_metric_get(tm, TCP_METRIC_CWND); | |
396 | if (tp->snd_cwnd > val) | |
397 | tcp_metric_set(tm, TCP_METRIC_CWND, | |
398 | tp->snd_cwnd); | |
399 | } | |
071d5080 | 400 | } else if (!tcp_in_slow_start(tp) && |
51c5d0c4 DM |
401 | icsk->icsk_ca_state == TCP_CA_Open) { |
402 | /* Cong. avoidance phase, cwnd is reliable. */ | |
403 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) | |
404 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
405 | max(tp->snd_cwnd >> 1, tp->snd_ssthresh)); | |
406 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { | |
407 | val = tcp_metric_get(tm, TCP_METRIC_CWND); | |
2100844c | 408 | tcp_metric_set(tm, TCP_METRIC_CWND, (val + tp->snd_cwnd) >> 1); |
51c5d0c4 DM |
409 | } |
410 | } else { | |
411 | /* Else slow start did not finish, cwnd is non-sense, | |
412 | * ssthresh may be also invalid. | |
413 | */ | |
414 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { | |
415 | val = tcp_metric_get(tm, TCP_METRIC_CWND); | |
416 | tcp_metric_set(tm, TCP_METRIC_CWND, | |
417 | (val + tp->snd_ssthresh) >> 1); | |
418 | } | |
419 | if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { | |
420 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); | |
421 | if (val && tp->snd_ssthresh > val) | |
422 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
423 | tp->snd_ssthresh); | |
424 | } | |
425 | if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) { | |
426 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); | |
427 | if (val < tp->reordering && | |
1043e25f | 428 | tp->reordering != net->ipv4.sysctl_tcp_reordering) |
51c5d0c4 DM |
429 | tcp_metric_set(tm, TCP_METRIC_REORDERING, |
430 | tp->reordering); | |
4aabd8ef DM |
431 | } |
432 | } | |
51c5d0c4 DM |
433 | tm->tcpm_stamp = jiffies; |
434 | out_unlock: | |
435 | rcu_read_unlock(); | |
4aabd8ef DM |
436 | } |
437 | ||
438 | /* Initialize metrics on socket. */ | |
439 | ||
440 | void tcp_init_metrics(struct sock *sk) | |
441 | { | |
4aabd8ef | 442 | struct dst_entry *dst = __sk_dst_get(sk); |
51c5d0c4 DM |
443 | struct tcp_sock *tp = tcp_sk(sk); |
444 | struct tcp_metrics_block *tm; | |
1b7fdd2a | 445 | u32 val, crtt = 0; /* cached RTT scaled by 8 */ |
4aabd8ef | 446 | |
c3a2e837 | 447 | sk_dst_confirm(sk); |
51456b29 | 448 | if (!dst) |
4aabd8ef DM |
449 | goto reset; |
450 | ||
51c5d0c4 DM |
451 | rcu_read_lock(); |
452 | tm = tcp_get_metrics(sk, dst, true); | |
453 | if (!tm) { | |
454 | rcu_read_unlock(); | |
455 | goto reset; | |
456 | } | |
457 | ||
458 | if (tcp_metric_locked(tm, TCP_METRIC_CWND)) | |
459 | tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND); | |
460 | ||
461 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); | |
462 | if (val) { | |
463 | tp->snd_ssthresh = val; | |
4aabd8ef DM |
464 | if (tp->snd_ssthresh > tp->snd_cwnd_clamp) |
465 | tp->snd_ssthresh = tp->snd_cwnd_clamp; | |
466 | } else { | |
467 | /* ssthresh may have been reduced unnecessarily during. | |
468 | * 3WHS. Restore it back to its initial default. | |
469 | */ | |
470 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; | |
471 | } | |
51c5d0c4 | 472 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); |
713bafea | 473 | if (val && tp->reordering != val) |
51c5d0c4 | 474 | tp->reordering = val; |
4aabd8ef | 475 | |
740b0f18 | 476 | crtt = tcp_metric_get(tm, TCP_METRIC_RTT); |
51c5d0c4 | 477 | rcu_read_unlock(); |
4aabd8ef | 478 | reset: |
52f20e65 YC |
479 | /* The initial RTT measurement from the SYN/SYN-ACK is not ideal |
480 | * to seed the RTO for later data packets because SYN packets are | |
481 | * small. Use the per-dst cached values to seed the RTO but keep | |
482 | * the RTT estimator variables intact (e.g., srtt, mdev, rttvar). | |
483 | * Later the RTO will be updated immediately upon obtaining the first | |
484 | * data RTT sample (tcp_rtt_estimator()). Hence the cached RTT only | |
485 | * influences the first RTO but not later RTT estimation. | |
486 | * | |
487 | * But if RTT is not available from the SYN (due to retransmits or | |
488 | * syn cookies) or the cache, force a conservative 3secs timeout. | |
489 | * | |
490 | * A bit of theory. RTT is time passed after "normal" sized packet | |
491 | * is sent until it is ACKed. In normal circumstances sending small | |
492 | * packets force peer to delay ACKs and calculation is correct too. | |
493 | * The algorithm is adaptive and, provided we follow specs, it | |
494 | * NEVER underestimate RTT. BUT! If peer tries to make some clever | |
495 | * tricks sort of "quick acks" for time long enough to decrease RTT | |
496 | * to low value, and then abruptly stops to do it and starts to delay | |
497 | * ACKs, wait for troubles. | |
498 | */ | |
740b0f18 | 499 | if (crtt > tp->srtt_us) { |
269aa759 | 500 | /* Set RTO like tcp_rtt_estimator(), but from cached RTT. */ |
9bdfb3b7 | 501 | crtt /= 8 * USEC_PER_SEC / HZ; |
269aa759 | 502 | inet_csk(sk)->icsk_rto = crtt + max(2 * crtt, tcp_rto_min(sk)); |
740b0f18 | 503 | } else if (tp->srtt_us == 0) { |
4aabd8ef DM |
504 | /* RFC6298: 5.7 We've failed to get a valid RTT sample from |
505 | * 3WHS. This is most likely due to retransmission, | |
506 | * including spurious one. Reset the RTO back to 3secs | |
507 | * from the more aggressive 1sec to avoid more spurious | |
508 | * retransmission. | |
509 | */ | |
740b0f18 ED |
510 | tp->rttvar_us = jiffies_to_usecs(TCP_TIMEOUT_FALLBACK); |
511 | tp->mdev_us = tp->mdev_max_us = tp->rttvar_us; | |
512 | ||
4aabd8ef DM |
513 | inet_csk(sk)->icsk_rto = TCP_TIMEOUT_FALLBACK; |
514 | } | |
515 | /* Cut cwnd down to 1 per RFC5681 if SYN or SYN-ACK has been | |
516 | * retransmitted. In light of RFC6298 more aggressive 1sec | |
517 | * initRTO, we only reset cwnd when more than 1 SYN/SYN-ACK | |
518 | * retransmission has occurred. | |
519 | */ | |
520 | if (tp->total_retrans > 1) | |
521 | tp->snd_cwnd = 1; | |
522 | else | |
523 | tp->snd_cwnd = tcp_init_cwnd(tp, dst); | |
c2203cf7 | 524 | tp->snd_cwnd_stamp = tcp_jiffies32; |
4aabd8ef | 525 | } |
ab92bb2f | 526 | |
d82bae12 | 527 | bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst) |
ab92bb2f | 528 | { |
51c5d0c4 DM |
529 | struct tcp_metrics_block *tm; |
530 | bool ret; | |
531 | ||
ab92bb2f DM |
532 | if (!dst) |
533 | return false; | |
51c5d0c4 DM |
534 | |
535 | rcu_read_lock(); | |
536 | tm = __tcp_get_metrics_req(req, dst); | |
d82bae12 | 537 | if (tm && tcp_metric_get(tm, TCP_METRIC_RTT)) |
81166dd6 | 538 | ret = true; |
d82bae12 SHY |
539 | else |
540 | ret = false; | |
81166dd6 DM |
541 | rcu_read_unlock(); |
542 | ||
543 | return ret; | |
544 | } | |
545 | ||
1fe4c481 YC |
546 | static DEFINE_SEQLOCK(fastopen_seqlock); |
547 | ||
548 | void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, | |
7268586b | 549 | struct tcp_fastopen_cookie *cookie) |
1fe4c481 YC |
550 | { |
551 | struct tcp_metrics_block *tm; | |
552 | ||
553 | rcu_read_lock(); | |
554 | tm = tcp_get_metrics(sk, __sk_dst_get(sk), false); | |
555 | if (tm) { | |
556 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; | |
557 | unsigned int seq; | |
558 | ||
559 | do { | |
560 | seq = read_seqbegin(&fastopen_seqlock); | |
561 | if (tfom->mss) | |
562 | *mss = tfom->mss; | |
563 | *cookie = tfom->cookie; | |
2646c831 DL |
564 | if (cookie->len <= 0 && tfom->try_exp == 1) |
565 | cookie->exp = true; | |
1fe4c481 YC |
566 | } while (read_seqretry(&fastopen_seqlock, seq)); |
567 | } | |
568 | rcu_read_unlock(); | |
569 | } | |
570 | ||
1fe4c481 | 571 | void tcp_fastopen_cache_set(struct sock *sk, u16 mss, |
2646c831 DL |
572 | struct tcp_fastopen_cookie *cookie, bool syn_lost, |
573 | u16 try_exp) | |
1fe4c481 | 574 | { |
dccf76ca | 575 | struct dst_entry *dst = __sk_dst_get(sk); |
1fe4c481 YC |
576 | struct tcp_metrics_block *tm; |
577 | ||
dccf76ca ED |
578 | if (!dst) |
579 | return; | |
1fe4c481 | 580 | rcu_read_lock(); |
dccf76ca | 581 | tm = tcp_get_metrics(sk, dst, true); |
1fe4c481 YC |
582 | if (tm) { |
583 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; | |
584 | ||
585 | write_seqlock_bh(&fastopen_seqlock); | |
c968601d YC |
586 | if (mss) |
587 | tfom->mss = mss; | |
588 | if (cookie && cookie->len > 0) | |
1fe4c481 | 589 | tfom->cookie = *cookie; |
2646c831 DL |
590 | else if (try_exp > tfom->try_exp && |
591 | tfom->cookie.len <= 0 && !tfom->cookie.exp) | |
592 | tfom->try_exp = try_exp; | |
aab48743 YC |
593 | if (syn_lost) { |
594 | ++tfom->syn_loss; | |
595 | tfom->last_syn_loss = jiffies; | |
596 | } else | |
597 | tfom->syn_loss = 0; | |
1fe4c481 YC |
598 | write_sequnlock_bh(&fastopen_seqlock); |
599 | } | |
600 | rcu_read_unlock(); | |
601 | } | |
602 | ||
489111e5 | 603 | static struct genl_family tcp_metrics_nl_family; |
d23ff701 | 604 | |
4f70c96f | 605 | static const struct nla_policy tcp_metrics_nl_policy[TCP_METRICS_ATTR_MAX + 1] = { |
d23ff701 JA |
606 | [TCP_METRICS_ATTR_ADDR_IPV4] = { .type = NLA_U32, }, |
607 | [TCP_METRICS_ATTR_ADDR_IPV6] = { .type = NLA_BINARY, | |
608 | .len = sizeof(struct in6_addr), }, | |
609 | /* Following attributes are not received for GET/DEL, | |
610 | * we keep them for reference | |
611 | */ | |
612 | #if 0 | |
613 | [TCP_METRICS_ATTR_AGE] = { .type = NLA_MSECS, }, | |
614 | [TCP_METRICS_ATTR_TW_TSVAL] = { .type = NLA_U32, }, | |
615 | [TCP_METRICS_ATTR_TW_TS_STAMP] = { .type = NLA_S32, }, | |
616 | [TCP_METRICS_ATTR_VALS] = { .type = NLA_NESTED, }, | |
617 | [TCP_METRICS_ATTR_FOPEN_MSS] = { .type = NLA_U16, }, | |
618 | [TCP_METRICS_ATTR_FOPEN_SYN_DROPS] = { .type = NLA_U16, }, | |
619 | [TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS] = { .type = NLA_MSECS, }, | |
620 | [TCP_METRICS_ATTR_FOPEN_COOKIE] = { .type = NLA_BINARY, | |
621 | .len = TCP_FASTOPEN_COOKIE_MAX, }, | |
622 | #endif | |
623 | }; | |
624 | ||
625 | /* Add attributes, caller cancels its header on failure */ | |
626 | static int tcp_metrics_fill_info(struct sk_buff *msg, | |
627 | struct tcp_metrics_block *tm) | |
628 | { | |
629 | struct nlattr *nest; | |
630 | int i; | |
631 | ||
324fd55a | 632 | switch (tm->tcpm_daddr.family) { |
d23ff701 | 633 | case AF_INET: |
930345ea | 634 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_ADDR_IPV4, |
3abef286 | 635 | inetpeer_get_addr_v4(&tm->tcpm_daddr)) < 0) |
d23ff701 | 636 | goto nla_put_failure; |
930345ea | 637 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_SADDR_IPV4, |
3abef286 | 638 | inetpeer_get_addr_v4(&tm->tcpm_saddr)) < 0) |
8a59359c | 639 | goto nla_put_failure; |
d23ff701 JA |
640 | break; |
641 | case AF_INET6: | |
930345ea | 642 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_ADDR_IPV6, |
3abef286 | 643 | inetpeer_get_addr_v6(&tm->tcpm_daddr)) < 0) |
d23ff701 | 644 | goto nla_put_failure; |
930345ea | 645 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_SADDR_IPV6, |
3abef286 | 646 | inetpeer_get_addr_v6(&tm->tcpm_saddr)) < 0) |
8a59359c | 647 | goto nla_put_failure; |
d23ff701 JA |
648 | break; |
649 | default: | |
650 | return -EAFNOSUPPORT; | |
651 | } | |
652 | ||
653 | if (nla_put_msecs(msg, TCP_METRICS_ATTR_AGE, | |
2175d87c ND |
654 | jiffies - tm->tcpm_stamp, |
655 | TCP_METRICS_ATTR_PAD) < 0) | |
d23ff701 | 656 | goto nla_put_failure; |
d23ff701 JA |
657 | |
658 | { | |
659 | int n = 0; | |
660 | ||
661 | nest = nla_nest_start(msg, TCP_METRICS_ATTR_VALS); | |
662 | if (!nest) | |
663 | goto nla_put_failure; | |
740b0f18 ED |
664 | for (i = 0; i < TCP_METRIC_MAX_KERNEL + 1; i++) { |
665 | u32 val = tm->tcpm_vals[i]; | |
666 | ||
667 | if (!val) | |
d23ff701 | 668 | continue; |
740b0f18 ED |
669 | if (i == TCP_METRIC_RTT) { |
670 | if (nla_put_u32(msg, TCP_METRIC_RTT_US + 1, | |
671 | val) < 0) | |
672 | goto nla_put_failure; | |
673 | n++; | |
674 | val = max(val / 1000, 1U); | |
675 | } | |
676 | if (i == TCP_METRIC_RTTVAR) { | |
677 | if (nla_put_u32(msg, TCP_METRIC_RTTVAR_US + 1, | |
678 | val) < 0) | |
679 | goto nla_put_failure; | |
680 | n++; | |
681 | val = max(val / 1000, 1U); | |
682 | } | |
683 | if (nla_put_u32(msg, i + 1, val) < 0) | |
d23ff701 JA |
684 | goto nla_put_failure; |
685 | n++; | |
686 | } | |
687 | if (n) | |
688 | nla_nest_end(msg, nest); | |
689 | else | |
690 | nla_nest_cancel(msg, nest); | |
691 | } | |
692 | ||
693 | { | |
694 | struct tcp_fastopen_metrics tfom_copy[1], *tfom; | |
695 | unsigned int seq; | |
696 | ||
697 | do { | |
698 | seq = read_seqbegin(&fastopen_seqlock); | |
699 | tfom_copy[0] = tm->tcpm_fastopen; | |
700 | } while (read_seqretry(&fastopen_seqlock, seq)); | |
701 | ||
702 | tfom = tfom_copy; | |
703 | if (tfom->mss && | |
704 | nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_MSS, | |
705 | tfom->mss) < 0) | |
706 | goto nla_put_failure; | |
707 | if (tfom->syn_loss && | |
708 | (nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROPS, | |
709 | tfom->syn_loss) < 0 || | |
710 | nla_put_msecs(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS, | |
2175d87c ND |
711 | jiffies - tfom->last_syn_loss, |
712 | TCP_METRICS_ATTR_PAD) < 0)) | |
d23ff701 JA |
713 | goto nla_put_failure; |
714 | if (tfom->cookie.len > 0 && | |
715 | nla_put(msg, TCP_METRICS_ATTR_FOPEN_COOKIE, | |
716 | tfom->cookie.len, tfom->cookie.val) < 0) | |
717 | goto nla_put_failure; | |
718 | } | |
719 | ||
720 | return 0; | |
721 | ||
722 | nla_put_failure: | |
723 | return -EMSGSIZE; | |
724 | } | |
725 | ||
726 | static int tcp_metrics_dump_info(struct sk_buff *skb, | |
727 | struct netlink_callback *cb, | |
728 | struct tcp_metrics_block *tm) | |
729 | { | |
730 | void *hdr; | |
731 | ||
15e47304 | 732 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
d23ff701 JA |
733 | &tcp_metrics_nl_family, NLM_F_MULTI, |
734 | TCP_METRICS_CMD_GET); | |
735 | if (!hdr) | |
736 | return -EMSGSIZE; | |
737 | ||
738 | if (tcp_metrics_fill_info(skb, tm) < 0) | |
739 | goto nla_put_failure; | |
740 | ||
053c095a JB |
741 | genlmsg_end(skb, hdr); |
742 | return 0; | |
d23ff701 JA |
743 | |
744 | nla_put_failure: | |
745 | genlmsg_cancel(skb, hdr); | |
746 | return -EMSGSIZE; | |
747 | } | |
748 | ||
749 | static int tcp_metrics_nl_dump(struct sk_buff *skb, | |
750 | struct netlink_callback *cb) | |
751 | { | |
752 | struct net *net = sock_net(skb->sk); | |
098a697b | 753 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
d23ff701 JA |
754 | unsigned int row, s_row = cb->args[0]; |
755 | int s_col = cb->args[1], col = s_col; | |
756 | ||
757 | for (row = s_row; row < max_rows; row++, s_col = 0) { | |
758 | struct tcp_metrics_block *tm; | |
098a697b | 759 | struct tcpm_hash_bucket *hb = tcp_metrics_hash + row; |
d23ff701 JA |
760 | |
761 | rcu_read_lock(); | |
762 | for (col = 0, tm = rcu_dereference(hb->chain); tm; | |
763 | tm = rcu_dereference(tm->tcpm_next), col++) { | |
849e8a0c EB |
764 | if (!net_eq(tm_net(tm), net)) |
765 | continue; | |
d23ff701 JA |
766 | if (col < s_col) |
767 | continue; | |
768 | if (tcp_metrics_dump_info(skb, cb, tm) < 0) { | |
769 | rcu_read_unlock(); | |
770 | goto done; | |
771 | } | |
772 | } | |
773 | rcu_read_unlock(); | |
774 | } | |
775 | ||
776 | done: | |
777 | cb->args[0] = row; | |
778 | cb->args[1] = col; | |
779 | return skb->len; | |
780 | } | |
781 | ||
3e7013dd CP |
782 | static int __parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
783 | unsigned int *hash, int optional, int v4, int v6) | |
d23ff701 JA |
784 | { |
785 | struct nlattr *a; | |
786 | ||
3e7013dd | 787 | a = info->attrs[v4]; |
d23ff701 | 788 | if (a) { |
3abef286 | 789 | inetpeer_set_addr_v4(addr, nla_get_in_addr(a)); |
3e7013dd | 790 | if (hash) |
3abef286 | 791 | *hash = ipv4_addr_hash(inetpeer_get_addr_v4(addr)); |
d23ff701 JA |
792 | return 0; |
793 | } | |
3e7013dd | 794 | a = info->attrs[v6]; |
d23ff701 | 795 | if (a) { |
3abef286 DA |
796 | struct in6_addr in6; |
797 | ||
2c42a3fb | 798 | if (nla_len(a) != sizeof(struct in6_addr)) |
d23ff701 | 799 | return -EINVAL; |
3abef286 DA |
800 | in6 = nla_get_in6_addr(a); |
801 | inetpeer_set_addr_v6(addr, &in6); | |
3e7013dd | 802 | if (hash) |
3abef286 | 803 | *hash = ipv6_addr_hash(inetpeer_get_addr_v6(addr)); |
d23ff701 JA |
804 | return 0; |
805 | } | |
806 | return optional ? 1 : -EAFNOSUPPORT; | |
807 | } | |
808 | ||
3e7013dd CP |
809 | static int parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
810 | unsigned int *hash, int optional) | |
811 | { | |
812 | return __parse_nl_addr(info, addr, hash, optional, | |
813 | TCP_METRICS_ATTR_ADDR_IPV4, | |
814 | TCP_METRICS_ATTR_ADDR_IPV6); | |
815 | } | |
816 | ||
817 | static int parse_nl_saddr(struct genl_info *info, struct inetpeer_addr *addr) | |
818 | { | |
819 | return __parse_nl_addr(info, addr, NULL, 0, | |
820 | TCP_METRICS_ATTR_SADDR_IPV4, | |
821 | TCP_METRICS_ATTR_SADDR_IPV6); | |
822 | } | |
823 | ||
d23ff701 JA |
824 | static int tcp_metrics_nl_cmd_get(struct sk_buff *skb, struct genl_info *info) |
825 | { | |
826 | struct tcp_metrics_block *tm; | |
3e7013dd | 827 | struct inetpeer_addr saddr, daddr; |
d23ff701 JA |
828 | unsigned int hash; |
829 | struct sk_buff *msg; | |
830 | struct net *net = genl_info_net(info); | |
831 | void *reply; | |
832 | int ret; | |
3e7013dd | 833 | bool src = true; |
d23ff701 | 834 | |
324fd55a | 835 | ret = parse_nl_addr(info, &daddr, &hash, 0); |
d23ff701 JA |
836 | if (ret < 0) |
837 | return ret; | |
838 | ||
3e7013dd CP |
839 | ret = parse_nl_saddr(info, &saddr); |
840 | if (ret < 0) | |
841 | src = false; | |
842 | ||
d23ff701 JA |
843 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
844 | if (!msg) | |
845 | return -ENOMEM; | |
846 | ||
847 | reply = genlmsg_put_reply(msg, info, &tcp_metrics_nl_family, 0, | |
848 | info->genlhdr->cmd); | |
849 | if (!reply) | |
850 | goto nla_put_failure; | |
851 | ||
3e5da62d | 852 | hash ^= net_hash_mix(net); |
098a697b | 853 | hash = hash_32(hash, tcp_metrics_hash_log); |
d23ff701 JA |
854 | ret = -ESRCH; |
855 | rcu_read_lock(); | |
098a697b | 856 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
d23ff701 | 857 | tm = rcu_dereference(tm->tcpm_next)) { |
3e7013dd | 858 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
849e8a0c EB |
859 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
860 | net_eq(tm_net(tm), net)) { | |
d23ff701 JA |
861 | ret = tcp_metrics_fill_info(msg, tm); |
862 | break; | |
863 | } | |
864 | } | |
865 | rcu_read_unlock(); | |
866 | if (ret < 0) | |
867 | goto out_free; | |
868 | ||
869 | genlmsg_end(msg, reply); | |
870 | return genlmsg_reply(msg, info); | |
871 | ||
872 | nla_put_failure: | |
873 | ret = -EMSGSIZE; | |
874 | ||
875 | out_free: | |
876 | nlmsg_free(msg); | |
877 | return ret; | |
878 | } | |
879 | ||
8a4bff71 | 880 | static void tcp_metrics_flush_all(struct net *net) |
d23ff701 | 881 | { |
098a697b EB |
882 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
883 | struct tcpm_hash_bucket *hb = tcp_metrics_hash; | |
d23ff701 JA |
884 | struct tcp_metrics_block *tm; |
885 | unsigned int row; | |
886 | ||
887 | for (row = 0; row < max_rows; row++, hb++) { | |
04f721c6 | 888 | struct tcp_metrics_block __rcu **pp; |
789e6ddb ED |
889 | bool match; |
890 | ||
d23ff701 | 891 | spin_lock_bh(&tcp_metrics_lock); |
04f721c6 | 892 | pp = &hb->chain; |
9f1ab186 | 893 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
789e6ddb | 894 | match = net ? net_eq(tm_net(tm), net) : |
273c28bc | 895 | !refcount_read(&tm_net(tm)->count); |
789e6ddb | 896 | if (match) { |
04f721c6 EB |
897 | *pp = tm->tcpm_next; |
898 | kfree_rcu(tm, rcu_head); | |
899 | } else { | |
900 | pp = &tm->tcpm_next; | |
901 | } | |
d23ff701 | 902 | } |
04f721c6 | 903 | spin_unlock_bh(&tcp_metrics_lock); |
d23ff701 | 904 | } |
d23ff701 JA |
905 | } |
906 | ||
907 | static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
908 | { | |
909 | struct tcpm_hash_bucket *hb; | |
00ca9c5b | 910 | struct tcp_metrics_block *tm; |
d23ff701 | 911 | struct tcp_metrics_block __rcu **pp; |
3e7013dd | 912 | struct inetpeer_addr saddr, daddr; |
d23ff701 JA |
913 | unsigned int hash; |
914 | struct net *net = genl_info_net(info); | |
915 | int ret; | |
00ca9c5b | 916 | bool src = true, found = false; |
d23ff701 | 917 | |
324fd55a | 918 | ret = parse_nl_addr(info, &daddr, &hash, 1); |
d23ff701 JA |
919 | if (ret < 0) |
920 | return ret; | |
8a4bff71 EB |
921 | if (ret > 0) { |
922 | tcp_metrics_flush_all(net); | |
923 | return 0; | |
924 | } | |
3e7013dd CP |
925 | ret = parse_nl_saddr(info, &saddr); |
926 | if (ret < 0) | |
927 | src = false; | |
d23ff701 | 928 | |
3e5da62d | 929 | hash ^= net_hash_mix(net); |
098a697b EB |
930 | hash = hash_32(hash, tcp_metrics_hash_log); |
931 | hb = tcp_metrics_hash + hash; | |
d23ff701 JA |
932 | pp = &hb->chain; |
933 | spin_lock_bh(&tcp_metrics_lock); | |
9f1ab186 | 934 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
3e7013dd | 935 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
849e8a0c EB |
936 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
937 | net_eq(tm_net(tm), net)) { | |
d23ff701 | 938 | *pp = tm->tcpm_next; |
00ca9c5b CP |
939 | kfree_rcu(tm, rcu_head); |
940 | found = true; | |
bbf852b9 CP |
941 | } else { |
942 | pp = &tm->tcpm_next; | |
d23ff701 JA |
943 | } |
944 | } | |
945 | spin_unlock_bh(&tcp_metrics_lock); | |
00ca9c5b | 946 | if (!found) |
d23ff701 | 947 | return -ESRCH; |
d23ff701 JA |
948 | return 0; |
949 | } | |
950 | ||
4534de83 | 951 | static const struct genl_ops tcp_metrics_nl_ops[] = { |
d23ff701 JA |
952 | { |
953 | .cmd = TCP_METRICS_CMD_GET, | |
954 | .doit = tcp_metrics_nl_cmd_get, | |
955 | .dumpit = tcp_metrics_nl_dump, | |
956 | .policy = tcp_metrics_nl_policy, | |
d23ff701 JA |
957 | }, |
958 | { | |
959 | .cmd = TCP_METRICS_CMD_DEL, | |
960 | .doit = tcp_metrics_nl_cmd_del, | |
961 | .policy = tcp_metrics_nl_policy, | |
962 | .flags = GENL_ADMIN_PERM, | |
963 | }, | |
964 | }; | |
965 | ||
56989f6d | 966 | static struct genl_family tcp_metrics_nl_family __ro_after_init = { |
489111e5 JB |
967 | .hdrsize = 0, |
968 | .name = TCP_METRICS_GENL_NAME, | |
969 | .version = TCP_METRICS_GENL_VERSION, | |
970 | .maxattr = TCP_METRICS_ATTR_MAX, | |
971 | .netnsok = true, | |
972 | .module = THIS_MODULE, | |
973 | .ops = tcp_metrics_nl_ops, | |
974 | .n_ops = ARRAY_SIZE(tcp_metrics_nl_ops), | |
975 | }; | |
976 | ||
5815d5e7 | 977 | static unsigned int tcpmhash_entries; |
51c5d0c4 DM |
978 | static int __init set_tcpmhash_entries(char *str) |
979 | { | |
980 | ssize_t ret; | |
981 | ||
982 | if (!str) | |
983 | return 0; | |
984 | ||
5815d5e7 | 985 | ret = kstrtouint(str, 0, &tcpmhash_entries); |
51c5d0c4 DM |
986 | if (ret) |
987 | return 0; | |
988 | ||
989 | return 1; | |
990 | } | |
991 | __setup("tcpmhash_entries=", set_tcpmhash_entries); | |
992 | ||
993 | static int __net_init tcp_net_metrics_init(struct net *net) | |
994 | { | |
5815d5e7 ED |
995 | size_t size; |
996 | unsigned int slots; | |
51c5d0c4 | 997 | |
098a697b EB |
998 | if (!net_eq(net, &init_net)) |
999 | return 0; | |
1000 | ||
51c5d0c4 DM |
1001 | slots = tcpmhash_entries; |
1002 | if (!slots) { | |
ca79b0c2 | 1003 | if (totalram_pages() >= 128 * 1024) |
51c5d0c4 DM |
1004 | slots = 16 * 1024; |
1005 | else | |
1006 | slots = 8 * 1024; | |
1007 | } | |
1008 | ||
098a697b EB |
1009 | tcp_metrics_hash_log = order_base_2(slots); |
1010 | size = sizeof(struct tcpm_hash_bucket) << tcp_metrics_hash_log; | |
51c5d0c4 | 1011 | |
752ade68 | 1012 | tcp_metrics_hash = kvzalloc(size, GFP_KERNEL); |
098a697b | 1013 | if (!tcp_metrics_hash) |
51c5d0c4 DM |
1014 | return -ENOMEM; |
1015 | ||
51c5d0c4 DM |
1016 | return 0; |
1017 | } | |
1018 | ||
789e6ddb | 1019 | static void __net_exit tcp_net_metrics_exit_batch(struct list_head *net_exit_list) |
51c5d0c4 | 1020 | { |
789e6ddb | 1021 | tcp_metrics_flush_all(NULL); |
51c5d0c4 DM |
1022 | } |
1023 | ||
1024 | static __net_initdata struct pernet_operations tcp_net_metrics_ops = { | |
789e6ddb ED |
1025 | .init = tcp_net_metrics_init, |
1026 | .exit_batch = tcp_net_metrics_exit_batch, | |
51c5d0c4 DM |
1027 | }; |
1028 | ||
1029 | void __init tcp_metrics_init(void) | |
1030 | { | |
d23ff701 JA |
1031 | int ret; |
1032 | ||
1033 | ret = register_pernet_subsys(&tcp_net_metrics_ops); | |
1034 | if (ret < 0) | |
6493517e EB |
1035 | panic("Could not allocate the tcp_metrics hash table\n"); |
1036 | ||
489111e5 | 1037 | ret = genl_register_family(&tcp_metrics_nl_family); |
d23ff701 | 1038 | if (ret < 0) |
6493517e | 1039 | panic("Could not register tcp_metrics generic netlink\n"); |
51c5d0c4 | 1040 | } |