Commit | Line | Data |
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7c657876 ACM |
1 | /* |
2 | * net/dccp/minisocks.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
7c657876 ACM |
13 | #include <linux/dccp.h> |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/timer.h> | |
16 | ||
17 | #include <net/sock.h> | |
18 | #include <net/xfrm.h> | |
19 | #include <net/inet_timewait_sock.h> | |
20 | ||
ae31c339 | 21 | #include "ackvec.h" |
7c657876 ACM |
22 | #include "ccid.h" |
23 | #include "dccp.h" | |
afe00251 | 24 | #include "feat.h" |
7c657876 | 25 | |
64cf1e5d ACM |
26 | struct inet_timewait_death_row dccp_death_row = { |
27 | .sysctl_max_tw_buckets = NR_FILE * 2, | |
28 | .period = DCCP_TIMEWAIT_LEN / INET_TWDR_TWKILL_SLOTS, | |
29 | .death_lock = SPIN_LOCK_UNLOCKED, | |
30 | .hashinfo = &dccp_hashinfo, | |
31 | .tw_timer = TIMER_INITIALIZER(inet_twdr_hangman, 0, | |
32 | (unsigned long)&dccp_death_row), | |
33 | .twkill_work = __WORK_INITIALIZER(dccp_death_row.twkill_work, | |
c4028958 | 34 | inet_twdr_twkill_work), |
64cf1e5d ACM |
35 | /* Short-time timewait calendar */ |
36 | ||
37 | .twcal_hand = -1, | |
38 | .twcal_timer = TIMER_INITIALIZER(inet_twdr_twcal_tick, 0, | |
39 | (unsigned long)&dccp_death_row), | |
40 | }; | |
41 | ||
f21e68ca ACM |
42 | EXPORT_SYMBOL_GPL(dccp_death_row); |
43 | ||
7c657876 ACM |
44 | void dccp_time_wait(struct sock *sk, int state, int timeo) |
45 | { | |
64cf1e5d | 46 | struct inet_timewait_sock *tw = NULL; |
7c657876 | 47 | |
64cf1e5d ACM |
48 | if (dccp_death_row.tw_count < dccp_death_row.sysctl_max_tw_buckets) |
49 | tw = inet_twsk_alloc(sk, state); | |
50 | ||
51 | if (tw != NULL) { | |
52 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
53 | const int rto = (icsk->icsk_rto << 2) - (icsk->icsk_rto >> 1); | |
3df80d93 ACM |
54 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
55 | if (tw->tw_family == PF_INET6) { | |
56 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
57 | struct inet6_timewait_sock *tw6; | |
64cf1e5d | 58 | |
3df80d93 ACM |
59 | tw->tw_ipv6_offset = inet6_tw_offset(sk->sk_prot); |
60 | tw6 = inet6_twsk((struct sock *)tw); | |
61 | ipv6_addr_copy(&tw6->tw_v6_daddr, &np->daddr); | |
62 | ipv6_addr_copy(&tw6->tw_v6_rcv_saddr, &np->rcv_saddr); | |
63 | tw->tw_ipv6only = np->ipv6only; | |
64 | } | |
65 | #endif | |
64cf1e5d ACM |
66 | /* Linkage updates. */ |
67 | __inet_twsk_hashdance(tw, sk, &dccp_hashinfo); | |
68 | ||
69 | /* Get the TIME_WAIT timeout firing. */ | |
70 | if (timeo < rto) | |
71 | timeo = rto; | |
72 | ||
73 | tw->tw_timeout = DCCP_TIMEWAIT_LEN; | |
74 | if (state == DCCP_TIME_WAIT) | |
75 | timeo = DCCP_TIMEWAIT_LEN; | |
76 | ||
77 | inet_twsk_schedule(tw, &dccp_death_row, timeo, | |
78 | DCCP_TIMEWAIT_LEN); | |
79 | inet_twsk_put(tw); | |
80 | } else { | |
81 | /* Sorry, if we're out of memory, just CLOSE this | |
82 | * socket up. We've got bigger problems than | |
83 | * non-graceful socket closings. | |
84 | */ | |
7690af3f ACM |
85 | LIMIT_NETDEBUG(KERN_INFO "DCCP: time wait bucket " |
86 | "table overflow\n"); | |
64cf1e5d ACM |
87 | } |
88 | ||
89 | dccp_done(sk); | |
7c657876 ACM |
90 | } |
91 | ||
92 | struct sock *dccp_create_openreq_child(struct sock *sk, | |
93 | const struct request_sock *req, | |
94 | const struct sk_buff *skb) | |
95 | { | |
96 | /* | |
97 | * Step 3: Process LISTEN state | |
98 | * | |
99 | * // Generate a new socket and switch to that socket | |
100 | * Set S := new socket for this port pair | |
101 | */ | |
102 | struct sock *newsk = inet_csk_clone(sk, req, GFP_ATOMIC); | |
103 | ||
104 | if (newsk != NULL) { | |
105 | const struct dccp_request_sock *dreq = dccp_rsk(req); | |
106 | struct inet_connection_sock *newicsk = inet_csk(sk); | |
107 | struct dccp_sock *newdp = dccp_sk(newsk); | |
a4bf3902 | 108 | struct dccp_minisock *newdmsk = dccp_msk(newsk); |
7c657876 | 109 | |
67e6b629 | 110 | newdp->dccps_role = DCCP_ROLE_SERVER; |
ae31c339 | 111 | newdp->dccps_hc_rx_ackvec = NULL; |
67e6b629 ACM |
112 | newdp->dccps_service_list = NULL; |
113 | newdp->dccps_service = dreq->dreq_service; | |
114 | newicsk->icsk_rto = DCCP_TIMEOUT_INIT; | |
b0e56780 | 115 | do_gettimeofday(&newdp->dccps_epoch); |
7c657876 | 116 | |
afe00251 AB |
117 | if (dccp_feat_clone(sk, newsk)) |
118 | goto out_free; | |
119 | ||
a4bf3902 | 120 | if (newdmsk->dccpms_send_ack_vector) { |
ae31c339 | 121 | newdp->dccps_hc_rx_ackvec = |
7400d781 | 122 | dccp_ackvec_alloc(GFP_ATOMIC); |
ae31c339 | 123 | if (unlikely(newdp->dccps_hc_rx_ackvec == NULL)) |
7c657876 ACM |
124 | goto out_free; |
125 | } | |
126 | ||
91f0ebf7 | 127 | newdp->dccps_hc_rx_ccid = |
a4bf3902 | 128 | ccid_hc_rx_new(newdmsk->dccpms_rx_ccid, |
91f0ebf7 ACM |
129 | newsk, GFP_ATOMIC); |
130 | newdp->dccps_hc_tx_ccid = | |
a4bf3902 | 131 | ccid_hc_tx_new(newdmsk->dccpms_tx_ccid, |
91f0ebf7 ACM |
132 | newsk, GFP_ATOMIC); |
133 | if (unlikely(newdp->dccps_hc_rx_ccid == NULL || | |
134 | newdp->dccps_hc_tx_ccid == NULL)) { | |
ae31c339 | 135 | dccp_ackvec_free(newdp->dccps_hc_rx_ackvec); |
91f0ebf7 ACM |
136 | ccid_hc_rx_delete(newdp->dccps_hc_rx_ccid, newsk); |
137 | ccid_hc_tx_delete(newdp->dccps_hc_tx_ccid, newsk); | |
7c657876 ACM |
138 | out_free: |
139 | /* It is still raw copy of parent, so invalidate | |
140 | * destructor and make plain sk_free() */ | |
141 | newsk->sk_destruct = NULL; | |
142 | sk_free(newsk); | |
143 | return NULL; | |
144 | } | |
145 | ||
7c657876 ACM |
146 | /* |
147 | * Step 3: Process LISTEN state | |
148 | * | |
149 | * Choose S.ISS (initial seqno) or set from Init Cookie | |
7690af3f ACM |
150 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init |
151 | * Cookie | |
7c657876 ACM |
152 | */ |
153 | ||
154 | /* See dccp_v4_conn_request */ | |
a4bf3902 | 155 | newdmsk->dccpms_sequence_window = req->rcv_wnd; |
7c657876 ACM |
156 | |
157 | newdp->dccps_gar = newdp->dccps_isr = dreq->dreq_isr; | |
158 | dccp_update_gsr(newsk, dreq->dreq_isr); | |
159 | ||
160 | newdp->dccps_iss = dreq->dreq_iss; | |
161 | dccp_update_gss(newsk, dreq->dreq_iss); | |
162 | ||
03ace394 ACM |
163 | /* |
164 | * SWL and AWL are initially adjusted so that they are not less than | |
165 | * the initial Sequence Numbers received and sent, respectively: | |
166 | * SWL := max(GSR + 1 - floor(W/4), ISR), | |
167 | * AWL := max(GSS - W' + 1, ISS). | |
168 | * These adjustments MUST be applied only at the beginning of the | |
169 | * connection. | |
170 | */ | |
171 | dccp_set_seqno(&newdp->dccps_swl, | |
172 | max48(newdp->dccps_swl, newdp->dccps_isr)); | |
173 | dccp_set_seqno(&newdp->dccps_awl, | |
174 | max48(newdp->dccps_awl, newdp->dccps_iss)); | |
175 | ||
7c657876 ACM |
176 | dccp_init_xmit_timers(newsk); |
177 | ||
178 | DCCP_INC_STATS_BH(DCCP_MIB_PASSIVEOPENS); | |
179 | } | |
180 | return newsk; | |
181 | } | |
182 | ||
f21e68ca ACM |
183 | EXPORT_SYMBOL_GPL(dccp_create_openreq_child); |
184 | ||
7c657876 ACM |
185 | /* |
186 | * Process an incoming packet for RESPOND sockets represented | |
187 | * as an request_sock. | |
188 | */ | |
189 | struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
190 | struct request_sock *req, | |
191 | struct request_sock **prev) | |
192 | { | |
193 | struct sock *child = NULL; | |
194 | ||
195 | /* Check for retransmitted REQUEST */ | |
196 | if (dccp_hdr(skb)->dccph_type == DCCP_PKT_REQUEST) { | |
7690af3f ACM |
197 | if (after48(DCCP_SKB_CB(skb)->dccpd_seq, |
198 | dccp_rsk(req)->dreq_isr)) { | |
7c657876 ACM |
199 | struct dccp_request_sock *dreq = dccp_rsk(req); |
200 | ||
201 | dccp_pr_debug("Retransmitted REQUEST\n"); | |
202 | /* Send another RESPONSE packet */ | |
203 | dccp_set_seqno(&dreq->dreq_iss, dreq->dreq_iss + 1); | |
7690af3f ACM |
204 | dccp_set_seqno(&dreq->dreq_isr, |
205 | DCCP_SKB_CB(skb)->dccpd_seq); | |
7c657876 ACM |
206 | req->rsk_ops->rtx_syn_ack(sk, req, NULL); |
207 | } | |
208 | /* Network Duplicate, discard packet */ | |
209 | return NULL; | |
210 | } | |
211 | ||
212 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_PACKET_ERROR; | |
213 | ||
214 | if (dccp_hdr(skb)->dccph_type != DCCP_PKT_ACK && | |
215 | dccp_hdr(skb)->dccph_type != DCCP_PKT_DATAACK) | |
216 | goto drop; | |
217 | ||
218 | /* Invalid ACK */ | |
219 | if (DCCP_SKB_CB(skb)->dccpd_ack_seq != dccp_rsk(req)->dreq_iss) { | |
7690af3f ACM |
220 | dccp_pr_debug("Invalid ACK number: ack_seq=%llu, " |
221 | "dreq_iss=%llu\n", | |
f6ccf554 DM |
222 | (unsigned long long) |
223 | DCCP_SKB_CB(skb)->dccpd_ack_seq, | |
224 | (unsigned long long) | |
225 | dccp_rsk(req)->dreq_iss); | |
7c657876 ACM |
226 | goto drop; |
227 | } | |
228 | ||
57cca05a | 229 | child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL); |
7c657876 ACM |
230 | if (child == NULL) |
231 | goto listen_overflow; | |
232 | ||
233 | /* FIXME: deal with options */ | |
234 | ||
235 | inet_csk_reqsk_queue_unlink(sk, req, prev); | |
236 | inet_csk_reqsk_queue_removed(sk, req); | |
237 | inet_csk_reqsk_queue_add(sk, req, child); | |
238 | out: | |
239 | return child; | |
240 | listen_overflow: | |
241 | dccp_pr_debug("listen_overflow!\n"); | |
242 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
243 | drop: | |
244 | if (dccp_hdr(skb)->dccph_type != DCCP_PKT_RESET) | |
245 | req->rsk_ops->send_reset(skb); | |
246 | ||
247 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
248 | goto out; | |
249 | } | |
250 | ||
f21e68ca ACM |
251 | EXPORT_SYMBOL_GPL(dccp_check_req); |
252 | ||
7c657876 ACM |
253 | /* |
254 | * Queue segment on the new socket if the new socket is active, | |
255 | * otherwise we just shortcircuit this and continue with | |
256 | * the new socket. | |
257 | */ | |
258 | int dccp_child_process(struct sock *parent, struct sock *child, | |
259 | struct sk_buff *skb) | |
260 | { | |
261 | int ret = 0; | |
262 | const int state = child->sk_state; | |
263 | ||
264 | if (!sock_owned_by_user(child)) { | |
7690af3f ACM |
265 | ret = dccp_rcv_state_process(child, skb, dccp_hdr(skb), |
266 | skb->len); | |
7c657876 ACM |
267 | |
268 | /* Wakeup parent, send SIGIO */ | |
269 | if (state == DCCP_RESPOND && child->sk_state != state) | |
270 | parent->sk_data_ready(parent, 0); | |
271 | } else { | |
272 | /* Alas, it is possible again, because we do lookup | |
273 | * in main socket hash table and lock on listening | |
274 | * socket does not protect us more. | |
275 | */ | |
276 | sk_add_backlog(child, skb); | |
277 | } | |
278 | ||
279 | bh_unlock_sock(child); | |
280 | sock_put(child); | |
281 | return ret; | |
282 | } | |
f21e68ca ACM |
283 | |
284 | EXPORT_SYMBOL_GPL(dccp_child_process); |