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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. */ | |
65e6d901 KYY |
388 | if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save && |
389 | !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { | |
51c5d0c4 DM |
390 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); |
391 | if (val && (tp->snd_cwnd >> 1) > val) | |
392 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
393 | tp->snd_cwnd >> 1); | |
394 | } | |
395 | if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) { | |
396 | val = tcp_metric_get(tm, TCP_METRIC_CWND); | |
397 | if (tp->snd_cwnd > val) | |
398 | tcp_metric_set(tm, TCP_METRIC_CWND, | |
399 | tp->snd_cwnd); | |
400 | } | |
071d5080 | 401 | } else if (!tcp_in_slow_start(tp) && |
51c5d0c4 DM |
402 | icsk->icsk_ca_state == TCP_CA_Open) { |
403 | /* Cong. avoidance phase, cwnd is reliable. */ | |
65e6d901 KYY |
404 | if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save && |
405 | !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) | |
51c5d0c4 DM |
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 | } | |
65e6d901 KYY |
421 | if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save && |
422 | !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) { | |
51c5d0c4 DM |
423 | val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH); |
424 | if (val && tp->snd_ssthresh > val) | |
425 | tcp_metric_set(tm, TCP_METRIC_SSTHRESH, | |
426 | tp->snd_ssthresh); | |
427 | } | |
428 | if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) { | |
429 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); | |
430 | if (val < tp->reordering && | |
1043e25f | 431 | tp->reordering != net->ipv4.sysctl_tcp_reordering) |
51c5d0c4 DM |
432 | tcp_metric_set(tm, TCP_METRIC_REORDERING, |
433 | tp->reordering); | |
4aabd8ef DM |
434 | } |
435 | } | |
51c5d0c4 DM |
436 | tm->tcpm_stamp = jiffies; |
437 | out_unlock: | |
438 | rcu_read_unlock(); | |
4aabd8ef DM |
439 | } |
440 | ||
441 | /* Initialize metrics on socket. */ | |
442 | ||
443 | void tcp_init_metrics(struct sock *sk) | |
444 | { | |
4aabd8ef | 445 | struct dst_entry *dst = __sk_dst_get(sk); |
51c5d0c4 | 446 | struct tcp_sock *tp = tcp_sk(sk); |
65e6d901 | 447 | struct net *net = sock_net(sk); |
51c5d0c4 | 448 | struct tcp_metrics_block *tm; |
1b7fdd2a | 449 | u32 val, crtt = 0; /* cached RTT scaled by 8 */ |
4aabd8ef | 450 | |
c3a2e837 | 451 | sk_dst_confirm(sk); |
51456b29 | 452 | if (!dst) |
4aabd8ef DM |
453 | goto reset; |
454 | ||
51c5d0c4 DM |
455 | rcu_read_lock(); |
456 | tm = tcp_get_metrics(sk, dst, true); | |
457 | if (!tm) { | |
458 | rcu_read_unlock(); | |
459 | goto reset; | |
460 | } | |
461 | ||
462 | if (tcp_metric_locked(tm, TCP_METRIC_CWND)) | |
463 | tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND); | |
464 | ||
65e6d901 KYY |
465 | val = net->ipv4.sysctl_tcp_no_ssthresh_metrics_save ? |
466 | 0 : tcp_metric_get(tm, TCP_METRIC_SSTHRESH); | |
51c5d0c4 DM |
467 | if (val) { |
468 | tp->snd_ssthresh = val; | |
4aabd8ef DM |
469 | if (tp->snd_ssthresh > tp->snd_cwnd_clamp) |
470 | tp->snd_ssthresh = tp->snd_cwnd_clamp; | |
471 | } else { | |
472 | /* ssthresh may have been reduced unnecessarily during. | |
473 | * 3WHS. Restore it back to its initial default. | |
474 | */ | |
475 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; | |
476 | } | |
51c5d0c4 | 477 | val = tcp_metric_get(tm, TCP_METRIC_REORDERING); |
713bafea | 478 | if (val && tp->reordering != val) |
51c5d0c4 | 479 | tp->reordering = val; |
4aabd8ef | 480 | |
740b0f18 | 481 | crtt = tcp_metric_get(tm, TCP_METRIC_RTT); |
51c5d0c4 | 482 | rcu_read_unlock(); |
4aabd8ef | 483 | reset: |
52f20e65 YC |
484 | /* The initial RTT measurement from the SYN/SYN-ACK is not ideal |
485 | * to seed the RTO for later data packets because SYN packets are | |
486 | * small. Use the per-dst cached values to seed the RTO but keep | |
487 | * the RTT estimator variables intact (e.g., srtt, mdev, rttvar). | |
488 | * Later the RTO will be updated immediately upon obtaining the first | |
489 | * data RTT sample (tcp_rtt_estimator()). Hence the cached RTT only | |
490 | * influences the first RTO but not later RTT estimation. | |
491 | * | |
492 | * But if RTT is not available from the SYN (due to retransmits or | |
493 | * syn cookies) or the cache, force a conservative 3secs timeout. | |
494 | * | |
495 | * A bit of theory. RTT is time passed after "normal" sized packet | |
496 | * is sent until it is ACKed. In normal circumstances sending small | |
497 | * packets force peer to delay ACKs and calculation is correct too. | |
498 | * The algorithm is adaptive and, provided we follow specs, it | |
499 | * NEVER underestimate RTT. BUT! If peer tries to make some clever | |
500 | * tricks sort of "quick acks" for time long enough to decrease RTT | |
501 | * to low value, and then abruptly stops to do it and starts to delay | |
502 | * ACKs, wait for troubles. | |
503 | */ | |
740b0f18 | 504 | if (crtt > tp->srtt_us) { |
269aa759 | 505 | /* Set RTO like tcp_rtt_estimator(), but from cached RTT. */ |
9bdfb3b7 | 506 | crtt /= 8 * USEC_PER_SEC / HZ; |
269aa759 | 507 | inet_csk(sk)->icsk_rto = crtt + max(2 * crtt, tcp_rto_min(sk)); |
740b0f18 | 508 | } else if (tp->srtt_us == 0) { |
4aabd8ef DM |
509 | /* RFC6298: 5.7 We've failed to get a valid RTT sample from |
510 | * 3WHS. This is most likely due to retransmission, | |
511 | * including spurious one. Reset the RTO back to 3secs | |
512 | * from the more aggressive 1sec to avoid more spurious | |
513 | * retransmission. | |
514 | */ | |
740b0f18 ED |
515 | tp->rttvar_us = jiffies_to_usecs(TCP_TIMEOUT_FALLBACK); |
516 | tp->mdev_us = tp->mdev_max_us = tp->rttvar_us; | |
517 | ||
4aabd8ef DM |
518 | inet_csk(sk)->icsk_rto = TCP_TIMEOUT_FALLBACK; |
519 | } | |
4aabd8ef | 520 | } |
ab92bb2f | 521 | |
d82bae12 | 522 | bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst) |
ab92bb2f | 523 | { |
51c5d0c4 DM |
524 | struct tcp_metrics_block *tm; |
525 | bool ret; | |
526 | ||
ab92bb2f DM |
527 | if (!dst) |
528 | return false; | |
51c5d0c4 DM |
529 | |
530 | rcu_read_lock(); | |
531 | tm = __tcp_get_metrics_req(req, dst); | |
d82bae12 | 532 | if (tm && tcp_metric_get(tm, TCP_METRIC_RTT)) |
81166dd6 | 533 | ret = true; |
d82bae12 SHY |
534 | else |
535 | ret = false; | |
81166dd6 DM |
536 | rcu_read_unlock(); |
537 | ||
538 | return ret; | |
539 | } | |
540 | ||
1fe4c481 YC |
541 | static DEFINE_SEQLOCK(fastopen_seqlock); |
542 | ||
543 | void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, | |
7268586b | 544 | struct tcp_fastopen_cookie *cookie) |
1fe4c481 YC |
545 | { |
546 | struct tcp_metrics_block *tm; | |
547 | ||
548 | rcu_read_lock(); | |
549 | tm = tcp_get_metrics(sk, __sk_dst_get(sk), false); | |
550 | if (tm) { | |
551 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; | |
552 | unsigned int seq; | |
553 | ||
554 | do { | |
555 | seq = read_seqbegin(&fastopen_seqlock); | |
556 | if (tfom->mss) | |
557 | *mss = tfom->mss; | |
558 | *cookie = tfom->cookie; | |
2646c831 DL |
559 | if (cookie->len <= 0 && tfom->try_exp == 1) |
560 | cookie->exp = true; | |
1fe4c481 YC |
561 | } while (read_seqretry(&fastopen_seqlock, seq)); |
562 | } | |
563 | rcu_read_unlock(); | |
564 | } | |
565 | ||
1fe4c481 | 566 | void tcp_fastopen_cache_set(struct sock *sk, u16 mss, |
2646c831 DL |
567 | struct tcp_fastopen_cookie *cookie, bool syn_lost, |
568 | u16 try_exp) | |
1fe4c481 | 569 | { |
dccf76ca | 570 | struct dst_entry *dst = __sk_dst_get(sk); |
1fe4c481 YC |
571 | struct tcp_metrics_block *tm; |
572 | ||
dccf76ca ED |
573 | if (!dst) |
574 | return; | |
1fe4c481 | 575 | rcu_read_lock(); |
dccf76ca | 576 | tm = tcp_get_metrics(sk, dst, true); |
1fe4c481 YC |
577 | if (tm) { |
578 | struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; | |
579 | ||
580 | write_seqlock_bh(&fastopen_seqlock); | |
c968601d YC |
581 | if (mss) |
582 | tfom->mss = mss; | |
583 | if (cookie && cookie->len > 0) | |
1fe4c481 | 584 | tfom->cookie = *cookie; |
2646c831 DL |
585 | else if (try_exp > tfom->try_exp && |
586 | tfom->cookie.len <= 0 && !tfom->cookie.exp) | |
587 | tfom->try_exp = try_exp; | |
aab48743 YC |
588 | if (syn_lost) { |
589 | ++tfom->syn_loss; | |
590 | tfom->last_syn_loss = jiffies; | |
591 | } else | |
592 | tfom->syn_loss = 0; | |
1fe4c481 YC |
593 | write_sequnlock_bh(&fastopen_seqlock); |
594 | } | |
595 | rcu_read_unlock(); | |
596 | } | |
597 | ||
489111e5 | 598 | static struct genl_family tcp_metrics_nl_family; |
d23ff701 | 599 | |
4f70c96f | 600 | static const struct nla_policy tcp_metrics_nl_policy[TCP_METRICS_ATTR_MAX + 1] = { |
d23ff701 JA |
601 | [TCP_METRICS_ATTR_ADDR_IPV4] = { .type = NLA_U32, }, |
602 | [TCP_METRICS_ATTR_ADDR_IPV6] = { .type = NLA_BINARY, | |
603 | .len = sizeof(struct in6_addr), }, | |
604 | /* Following attributes are not received for GET/DEL, | |
605 | * we keep them for reference | |
606 | */ | |
607 | #if 0 | |
608 | [TCP_METRICS_ATTR_AGE] = { .type = NLA_MSECS, }, | |
609 | [TCP_METRICS_ATTR_TW_TSVAL] = { .type = NLA_U32, }, | |
610 | [TCP_METRICS_ATTR_TW_TS_STAMP] = { .type = NLA_S32, }, | |
611 | [TCP_METRICS_ATTR_VALS] = { .type = NLA_NESTED, }, | |
612 | [TCP_METRICS_ATTR_FOPEN_MSS] = { .type = NLA_U16, }, | |
613 | [TCP_METRICS_ATTR_FOPEN_SYN_DROPS] = { .type = NLA_U16, }, | |
614 | [TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS] = { .type = NLA_MSECS, }, | |
615 | [TCP_METRICS_ATTR_FOPEN_COOKIE] = { .type = NLA_BINARY, | |
616 | .len = TCP_FASTOPEN_COOKIE_MAX, }, | |
617 | #endif | |
618 | }; | |
619 | ||
620 | /* Add attributes, caller cancels its header on failure */ | |
621 | static int tcp_metrics_fill_info(struct sk_buff *msg, | |
622 | struct tcp_metrics_block *tm) | |
623 | { | |
624 | struct nlattr *nest; | |
625 | int i; | |
626 | ||
324fd55a | 627 | switch (tm->tcpm_daddr.family) { |
d23ff701 | 628 | case AF_INET: |
930345ea | 629 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_ADDR_IPV4, |
3abef286 | 630 | inetpeer_get_addr_v4(&tm->tcpm_daddr)) < 0) |
d23ff701 | 631 | goto nla_put_failure; |
930345ea | 632 | if (nla_put_in_addr(msg, TCP_METRICS_ATTR_SADDR_IPV4, |
3abef286 | 633 | inetpeer_get_addr_v4(&tm->tcpm_saddr)) < 0) |
8a59359c | 634 | goto nla_put_failure; |
d23ff701 JA |
635 | break; |
636 | case AF_INET6: | |
930345ea | 637 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_ADDR_IPV6, |
3abef286 | 638 | inetpeer_get_addr_v6(&tm->tcpm_daddr)) < 0) |
d23ff701 | 639 | goto nla_put_failure; |
930345ea | 640 | if (nla_put_in6_addr(msg, TCP_METRICS_ATTR_SADDR_IPV6, |
3abef286 | 641 | inetpeer_get_addr_v6(&tm->tcpm_saddr)) < 0) |
8a59359c | 642 | goto nla_put_failure; |
d23ff701 JA |
643 | break; |
644 | default: | |
645 | return -EAFNOSUPPORT; | |
646 | } | |
647 | ||
648 | if (nla_put_msecs(msg, TCP_METRICS_ATTR_AGE, | |
2175d87c ND |
649 | jiffies - tm->tcpm_stamp, |
650 | TCP_METRICS_ATTR_PAD) < 0) | |
d23ff701 | 651 | goto nla_put_failure; |
d23ff701 JA |
652 | |
653 | { | |
654 | int n = 0; | |
655 | ||
ae0be8de | 656 | nest = nla_nest_start_noflag(msg, TCP_METRICS_ATTR_VALS); |
d23ff701 JA |
657 | if (!nest) |
658 | goto nla_put_failure; | |
740b0f18 ED |
659 | for (i = 0; i < TCP_METRIC_MAX_KERNEL + 1; i++) { |
660 | u32 val = tm->tcpm_vals[i]; | |
661 | ||
662 | if (!val) | |
d23ff701 | 663 | continue; |
740b0f18 ED |
664 | if (i == TCP_METRIC_RTT) { |
665 | if (nla_put_u32(msg, TCP_METRIC_RTT_US + 1, | |
666 | val) < 0) | |
667 | goto nla_put_failure; | |
668 | n++; | |
669 | val = max(val / 1000, 1U); | |
670 | } | |
671 | if (i == TCP_METRIC_RTTVAR) { | |
672 | if (nla_put_u32(msg, TCP_METRIC_RTTVAR_US + 1, | |
673 | val) < 0) | |
674 | goto nla_put_failure; | |
675 | n++; | |
676 | val = max(val / 1000, 1U); | |
677 | } | |
678 | if (nla_put_u32(msg, i + 1, val) < 0) | |
d23ff701 JA |
679 | goto nla_put_failure; |
680 | n++; | |
681 | } | |
682 | if (n) | |
683 | nla_nest_end(msg, nest); | |
684 | else | |
685 | nla_nest_cancel(msg, nest); | |
686 | } | |
687 | ||
688 | { | |
689 | struct tcp_fastopen_metrics tfom_copy[1], *tfom; | |
690 | unsigned int seq; | |
691 | ||
692 | do { | |
693 | seq = read_seqbegin(&fastopen_seqlock); | |
694 | tfom_copy[0] = tm->tcpm_fastopen; | |
695 | } while (read_seqretry(&fastopen_seqlock, seq)); | |
696 | ||
697 | tfom = tfom_copy; | |
698 | if (tfom->mss && | |
699 | nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_MSS, | |
700 | tfom->mss) < 0) | |
701 | goto nla_put_failure; | |
702 | if (tfom->syn_loss && | |
703 | (nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROPS, | |
704 | tfom->syn_loss) < 0 || | |
705 | nla_put_msecs(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS, | |
2175d87c ND |
706 | jiffies - tfom->last_syn_loss, |
707 | TCP_METRICS_ATTR_PAD) < 0)) | |
d23ff701 JA |
708 | goto nla_put_failure; |
709 | if (tfom->cookie.len > 0 && | |
710 | nla_put(msg, TCP_METRICS_ATTR_FOPEN_COOKIE, | |
711 | tfom->cookie.len, tfom->cookie.val) < 0) | |
712 | goto nla_put_failure; | |
713 | } | |
714 | ||
715 | return 0; | |
716 | ||
717 | nla_put_failure: | |
718 | return -EMSGSIZE; | |
719 | } | |
720 | ||
721 | static int tcp_metrics_dump_info(struct sk_buff *skb, | |
722 | struct netlink_callback *cb, | |
723 | struct tcp_metrics_block *tm) | |
724 | { | |
725 | void *hdr; | |
726 | ||
15e47304 | 727 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
d23ff701 JA |
728 | &tcp_metrics_nl_family, NLM_F_MULTI, |
729 | TCP_METRICS_CMD_GET); | |
730 | if (!hdr) | |
731 | return -EMSGSIZE; | |
732 | ||
733 | if (tcp_metrics_fill_info(skb, tm) < 0) | |
734 | goto nla_put_failure; | |
735 | ||
053c095a JB |
736 | genlmsg_end(skb, hdr); |
737 | return 0; | |
d23ff701 JA |
738 | |
739 | nla_put_failure: | |
740 | genlmsg_cancel(skb, hdr); | |
741 | return -EMSGSIZE; | |
742 | } | |
743 | ||
744 | static int tcp_metrics_nl_dump(struct sk_buff *skb, | |
745 | struct netlink_callback *cb) | |
746 | { | |
747 | struct net *net = sock_net(skb->sk); | |
098a697b | 748 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
d23ff701 JA |
749 | unsigned int row, s_row = cb->args[0]; |
750 | int s_col = cb->args[1], col = s_col; | |
751 | ||
752 | for (row = s_row; row < max_rows; row++, s_col = 0) { | |
753 | struct tcp_metrics_block *tm; | |
098a697b | 754 | struct tcpm_hash_bucket *hb = tcp_metrics_hash + row; |
d23ff701 JA |
755 | |
756 | rcu_read_lock(); | |
757 | for (col = 0, tm = rcu_dereference(hb->chain); tm; | |
758 | tm = rcu_dereference(tm->tcpm_next), col++) { | |
849e8a0c EB |
759 | if (!net_eq(tm_net(tm), net)) |
760 | continue; | |
d23ff701 JA |
761 | if (col < s_col) |
762 | continue; | |
763 | if (tcp_metrics_dump_info(skb, cb, tm) < 0) { | |
764 | rcu_read_unlock(); | |
765 | goto done; | |
766 | } | |
767 | } | |
768 | rcu_read_unlock(); | |
769 | } | |
770 | ||
771 | done: | |
772 | cb->args[0] = row; | |
773 | cb->args[1] = col; | |
774 | return skb->len; | |
775 | } | |
776 | ||
3e7013dd CP |
777 | static int __parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
778 | unsigned int *hash, int optional, int v4, int v6) | |
d23ff701 JA |
779 | { |
780 | struct nlattr *a; | |
781 | ||
3e7013dd | 782 | a = info->attrs[v4]; |
d23ff701 | 783 | if (a) { |
3abef286 | 784 | inetpeer_set_addr_v4(addr, nla_get_in_addr(a)); |
3e7013dd | 785 | if (hash) |
3abef286 | 786 | *hash = ipv4_addr_hash(inetpeer_get_addr_v4(addr)); |
d23ff701 JA |
787 | return 0; |
788 | } | |
3e7013dd | 789 | a = info->attrs[v6]; |
d23ff701 | 790 | if (a) { |
3abef286 DA |
791 | struct in6_addr in6; |
792 | ||
2c42a3fb | 793 | if (nla_len(a) != sizeof(struct in6_addr)) |
d23ff701 | 794 | return -EINVAL; |
3abef286 DA |
795 | in6 = nla_get_in6_addr(a); |
796 | inetpeer_set_addr_v6(addr, &in6); | |
3e7013dd | 797 | if (hash) |
3abef286 | 798 | *hash = ipv6_addr_hash(inetpeer_get_addr_v6(addr)); |
d23ff701 JA |
799 | return 0; |
800 | } | |
801 | return optional ? 1 : -EAFNOSUPPORT; | |
802 | } | |
803 | ||
3e7013dd CP |
804 | static int parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr, |
805 | unsigned int *hash, int optional) | |
806 | { | |
807 | return __parse_nl_addr(info, addr, hash, optional, | |
808 | TCP_METRICS_ATTR_ADDR_IPV4, | |
809 | TCP_METRICS_ATTR_ADDR_IPV6); | |
810 | } | |
811 | ||
812 | static int parse_nl_saddr(struct genl_info *info, struct inetpeer_addr *addr) | |
813 | { | |
814 | return __parse_nl_addr(info, addr, NULL, 0, | |
815 | TCP_METRICS_ATTR_SADDR_IPV4, | |
816 | TCP_METRICS_ATTR_SADDR_IPV6); | |
817 | } | |
818 | ||
d23ff701 JA |
819 | static int tcp_metrics_nl_cmd_get(struct sk_buff *skb, struct genl_info *info) |
820 | { | |
821 | struct tcp_metrics_block *tm; | |
3e7013dd | 822 | struct inetpeer_addr saddr, daddr; |
d23ff701 JA |
823 | unsigned int hash; |
824 | struct sk_buff *msg; | |
825 | struct net *net = genl_info_net(info); | |
826 | void *reply; | |
827 | int ret; | |
3e7013dd | 828 | bool src = true; |
d23ff701 | 829 | |
324fd55a | 830 | ret = parse_nl_addr(info, &daddr, &hash, 0); |
d23ff701 JA |
831 | if (ret < 0) |
832 | return ret; | |
833 | ||
3e7013dd CP |
834 | ret = parse_nl_saddr(info, &saddr); |
835 | if (ret < 0) | |
836 | src = false; | |
837 | ||
d23ff701 JA |
838 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
839 | if (!msg) | |
840 | return -ENOMEM; | |
841 | ||
842 | reply = genlmsg_put_reply(msg, info, &tcp_metrics_nl_family, 0, | |
843 | info->genlhdr->cmd); | |
844 | if (!reply) | |
845 | goto nla_put_failure; | |
846 | ||
3e5da62d | 847 | hash ^= net_hash_mix(net); |
098a697b | 848 | hash = hash_32(hash, tcp_metrics_hash_log); |
d23ff701 JA |
849 | ret = -ESRCH; |
850 | rcu_read_lock(); | |
098a697b | 851 | for (tm = rcu_dereference(tcp_metrics_hash[hash].chain); tm; |
d23ff701 | 852 | tm = rcu_dereference(tm->tcpm_next)) { |
3e7013dd | 853 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
849e8a0c EB |
854 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
855 | net_eq(tm_net(tm), net)) { | |
d23ff701 JA |
856 | ret = tcp_metrics_fill_info(msg, tm); |
857 | break; | |
858 | } | |
859 | } | |
860 | rcu_read_unlock(); | |
861 | if (ret < 0) | |
862 | goto out_free; | |
863 | ||
864 | genlmsg_end(msg, reply); | |
865 | return genlmsg_reply(msg, info); | |
866 | ||
867 | nla_put_failure: | |
868 | ret = -EMSGSIZE; | |
869 | ||
870 | out_free: | |
871 | nlmsg_free(msg); | |
872 | return ret; | |
873 | } | |
874 | ||
8a4bff71 | 875 | static void tcp_metrics_flush_all(struct net *net) |
d23ff701 | 876 | { |
098a697b EB |
877 | unsigned int max_rows = 1U << tcp_metrics_hash_log; |
878 | struct tcpm_hash_bucket *hb = tcp_metrics_hash; | |
d23ff701 JA |
879 | struct tcp_metrics_block *tm; |
880 | unsigned int row; | |
881 | ||
882 | for (row = 0; row < max_rows; row++, hb++) { | |
04f721c6 | 883 | struct tcp_metrics_block __rcu **pp; |
789e6ddb ED |
884 | bool match; |
885 | ||
d23ff701 | 886 | spin_lock_bh(&tcp_metrics_lock); |
04f721c6 | 887 | pp = &hb->chain; |
9f1ab186 | 888 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
789e6ddb | 889 | match = net ? net_eq(tm_net(tm), net) : |
8b8f3e66 | 890 | !refcount_read(&tm_net(tm)->ns.count); |
789e6ddb | 891 | if (match) { |
04f721c6 EB |
892 | *pp = tm->tcpm_next; |
893 | kfree_rcu(tm, rcu_head); | |
894 | } else { | |
895 | pp = &tm->tcpm_next; | |
896 | } | |
d23ff701 | 897 | } |
04f721c6 | 898 | spin_unlock_bh(&tcp_metrics_lock); |
d23ff701 | 899 | } |
d23ff701 JA |
900 | } |
901 | ||
902 | static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
903 | { | |
904 | struct tcpm_hash_bucket *hb; | |
00ca9c5b | 905 | struct tcp_metrics_block *tm; |
d23ff701 | 906 | struct tcp_metrics_block __rcu **pp; |
3e7013dd | 907 | struct inetpeer_addr saddr, daddr; |
d23ff701 JA |
908 | unsigned int hash; |
909 | struct net *net = genl_info_net(info); | |
910 | int ret; | |
00ca9c5b | 911 | bool src = true, found = false; |
d23ff701 | 912 | |
324fd55a | 913 | ret = parse_nl_addr(info, &daddr, &hash, 1); |
d23ff701 JA |
914 | if (ret < 0) |
915 | return ret; | |
8a4bff71 EB |
916 | if (ret > 0) { |
917 | tcp_metrics_flush_all(net); | |
918 | return 0; | |
919 | } | |
3e7013dd CP |
920 | ret = parse_nl_saddr(info, &saddr); |
921 | if (ret < 0) | |
922 | src = false; | |
d23ff701 | 923 | |
3e5da62d | 924 | hash ^= net_hash_mix(net); |
098a697b EB |
925 | hash = hash_32(hash, tcp_metrics_hash_log); |
926 | hb = tcp_metrics_hash + hash; | |
d23ff701 JA |
927 | pp = &hb->chain; |
928 | spin_lock_bh(&tcp_metrics_lock); | |
9f1ab186 | 929 | for (tm = deref_locked(*pp); tm; tm = deref_locked(*pp)) { |
3e7013dd | 930 | if (addr_same(&tm->tcpm_daddr, &daddr) && |
849e8a0c EB |
931 | (!src || addr_same(&tm->tcpm_saddr, &saddr)) && |
932 | net_eq(tm_net(tm), net)) { | |
d23ff701 | 933 | *pp = tm->tcpm_next; |
00ca9c5b CP |
934 | kfree_rcu(tm, rcu_head); |
935 | found = true; | |
bbf852b9 CP |
936 | } else { |
937 | pp = &tm->tcpm_next; | |
d23ff701 JA |
938 | } |
939 | } | |
940 | spin_unlock_bh(&tcp_metrics_lock); | |
00ca9c5b | 941 | if (!found) |
d23ff701 | 942 | return -ESRCH; |
d23ff701 JA |
943 | return 0; |
944 | } | |
945 | ||
66a9b928 | 946 | static const struct genl_small_ops tcp_metrics_nl_ops[] = { |
d23ff701 JA |
947 | { |
948 | .cmd = TCP_METRICS_CMD_GET, | |
ef6243ac | 949 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
d23ff701 JA |
950 | .doit = tcp_metrics_nl_cmd_get, |
951 | .dumpit = tcp_metrics_nl_dump, | |
d23ff701 JA |
952 | }, |
953 | { | |
954 | .cmd = TCP_METRICS_CMD_DEL, | |
ef6243ac | 955 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
d23ff701 | 956 | .doit = tcp_metrics_nl_cmd_del, |
d23ff701 JA |
957 | .flags = GENL_ADMIN_PERM, |
958 | }, | |
959 | }; | |
960 | ||
56989f6d | 961 | static struct genl_family tcp_metrics_nl_family __ro_after_init = { |
489111e5 JB |
962 | .hdrsize = 0, |
963 | .name = TCP_METRICS_GENL_NAME, | |
964 | .version = TCP_METRICS_GENL_VERSION, | |
965 | .maxattr = TCP_METRICS_ATTR_MAX, | |
3b0f31f2 | 966 | .policy = tcp_metrics_nl_policy, |
489111e5 JB |
967 | .netnsok = true, |
968 | .module = THIS_MODULE, | |
66a9b928 JK |
969 | .small_ops = tcp_metrics_nl_ops, |
970 | .n_small_ops = ARRAY_SIZE(tcp_metrics_nl_ops), | |
489111e5 JB |
971 | }; |
972 | ||
5815d5e7 | 973 | static unsigned int tcpmhash_entries; |
51c5d0c4 DM |
974 | static int __init set_tcpmhash_entries(char *str) |
975 | { | |
976 | ssize_t ret; | |
977 | ||
978 | if (!str) | |
979 | return 0; | |
980 | ||
5815d5e7 | 981 | ret = kstrtouint(str, 0, &tcpmhash_entries); |
51c5d0c4 DM |
982 | if (ret) |
983 | return 0; | |
984 | ||
985 | return 1; | |
986 | } | |
987 | __setup("tcpmhash_entries=", set_tcpmhash_entries); | |
988 | ||
989 | static int __net_init tcp_net_metrics_init(struct net *net) | |
990 | { | |
5815d5e7 ED |
991 | size_t size; |
992 | unsigned int slots; | |
51c5d0c4 | 993 | |
098a697b EB |
994 | if (!net_eq(net, &init_net)) |
995 | return 0; | |
996 | ||
51c5d0c4 DM |
997 | slots = tcpmhash_entries; |
998 | if (!slots) { | |
ca79b0c2 | 999 | if (totalram_pages() >= 128 * 1024) |
51c5d0c4 DM |
1000 | slots = 16 * 1024; |
1001 | else | |
1002 | slots = 8 * 1024; | |
1003 | } | |
1004 | ||
098a697b EB |
1005 | tcp_metrics_hash_log = order_base_2(slots); |
1006 | size = sizeof(struct tcpm_hash_bucket) << tcp_metrics_hash_log; | |
51c5d0c4 | 1007 | |
752ade68 | 1008 | tcp_metrics_hash = kvzalloc(size, GFP_KERNEL); |
098a697b | 1009 | if (!tcp_metrics_hash) |
51c5d0c4 DM |
1010 | return -ENOMEM; |
1011 | ||
51c5d0c4 DM |
1012 | return 0; |
1013 | } | |
1014 | ||
789e6ddb | 1015 | static void __net_exit tcp_net_metrics_exit_batch(struct list_head *net_exit_list) |
51c5d0c4 | 1016 | { |
789e6ddb | 1017 | tcp_metrics_flush_all(NULL); |
51c5d0c4 DM |
1018 | } |
1019 | ||
1020 | static __net_initdata struct pernet_operations tcp_net_metrics_ops = { | |
789e6ddb ED |
1021 | .init = tcp_net_metrics_init, |
1022 | .exit_batch = tcp_net_metrics_exit_batch, | |
51c5d0c4 DM |
1023 | }; |
1024 | ||
1025 | void __init tcp_metrics_init(void) | |
1026 | { | |
d23ff701 JA |
1027 | int ret; |
1028 | ||
1029 | ret = register_pernet_subsys(&tcp_net_metrics_ops); | |
1030 | if (ret < 0) | |
6493517e EB |
1031 | panic("Could not allocate the tcp_metrics hash table\n"); |
1032 | ||
489111e5 | 1033 | ret = genl_register_family(&tcp_metrics_nl_family); |
d23ff701 | 1034 | if (ret < 0) |
6493517e | 1035 | panic("Could not register tcp_metrics generic netlink\n"); |
51c5d0c4 | 1036 | } |