mirror of https://gitee.com/openkylin/linux.git
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Support for INET6 connection oriented protocols.
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*
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* Authors: See the TCPv6 sources
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or(at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/jhash.h>
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#include <net/addrconf.h>
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#include <net/inet_connection_sock.h>
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#include <net/sock.h>
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/*
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* request_sock (formerly open request) hash tables.
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*/
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static u32 inet6_synq_hash(const struct in6_addr *raddr, const u16 rport,
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const u32 rnd, const u16 synq_hsize)
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{
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u32 a = raddr->s6_addr32[0];
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u32 b = raddr->s6_addr32[1];
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u32 c = raddr->s6_addr32[2];
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a += JHASH_GOLDEN_RATIO;
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b += JHASH_GOLDEN_RATIO;
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c += rnd;
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__jhash_mix(a, b, c);
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a += raddr->s6_addr32[3];
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b += (u32)rport;
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__jhash_mix(a, b, c);
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return c & (synq_hsize - 1);
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}
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struct request_sock *inet6_csk_search_req(const struct sock *sk,
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struct request_sock ***prevp,
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const __u16 rport,
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const struct in6_addr *raddr,
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const struct in6_addr *laddr,
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const int iif)
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{
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const struct inet_connection_sock *icsk = inet_csk(sk);
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struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
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struct request_sock *req, **prev;
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for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
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lopt->hash_rnd,
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lopt->nr_table_entries)];
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(req = *prev) != NULL;
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prev = &req->dl_next) {
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const struct inet6_request_sock *treq = inet6_rsk(req);
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if (inet_rsk(req)->rmt_port == rport &&
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req->rsk_ops->family == AF_INET6 &&
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ipv6_addr_equal(&treq->rmt_addr, raddr) &&
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ipv6_addr_equal(&treq->loc_addr, laddr) &&
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(!treq->iif || treq->iif == iif)) {
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BUG_TRAP(req->sk == NULL);
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*prevp = prev;
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return req;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(inet6_csk_search_req);
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void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
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struct request_sock *req,
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const unsigned long timeout)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
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const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
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inet_rsk(req)->rmt_port,
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lopt->hash_rnd, lopt->nr_table_entries);
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reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
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inet_csk_reqsk_queue_added(sk, timeout);
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}
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EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
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