/* * net/dccp/minisocks.c * * An implementation of the DCCP protocol * Arnaldo Carvalho de Melo * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include #include #include #include #include "ackvec.h" #include "ccid.h" #include "dccp.h" #include "feat.h" struct inet_timewait_death_row dccp_death_row = { .sysctl_max_tw_buckets = NR_FILE * 2, .hashinfo = &dccp_hashinfo, }; EXPORT_SYMBOL_GPL(dccp_death_row); void dccp_time_wait(struct sock *sk, int state, int timeo) { struct inet_timewait_sock *tw; tw = inet_twsk_alloc(sk, &dccp_death_row, state); if (tw != NULL) { const struct inet_connection_sock *icsk = inet_csk(sk); const int rto = (icsk->icsk_rto << 2) - (icsk->icsk_rto >> 1); #if IS_ENABLED(CONFIG_IPV6) if (tw->tw_family == PF_INET6) { tw->tw_v6_daddr = sk->sk_v6_daddr; tw->tw_v6_rcv_saddr = sk->sk_v6_rcv_saddr; tw->tw_ipv6only = sk->sk_ipv6only; } #endif /* Get the TIME_WAIT timeout firing. */ if (timeo < rto) timeo = rto; tw->tw_timeout = DCCP_TIMEWAIT_LEN; if (state == DCCP_TIME_WAIT) timeo = DCCP_TIMEWAIT_LEN; inet_twsk_schedule(tw, timeo); /* Linkage updates. */ __inet_twsk_hashdance(tw, sk, &dccp_hashinfo); inet_twsk_put(tw); } else { /* Sorry, if we're out of memory, just CLOSE this * socket up. We've got bigger problems than * non-graceful socket closings. */ DCCP_WARN("time wait bucket table overflow\n"); } dccp_done(sk); } struct sock *dccp_create_openreq_child(const struct sock *sk, const struct request_sock *req, const struct sk_buff *skb) { /* * Step 3: Process LISTEN state * * (* Generate a new socket and switch to that socket *) * Set S := new socket for this port pair */ struct sock *newsk = inet_csk_clone_lock(sk, req, GFP_ATOMIC); if (newsk != NULL) { struct dccp_request_sock *dreq = dccp_rsk(req); struct inet_connection_sock *newicsk = inet_csk(newsk); struct dccp_sock *newdp = dccp_sk(newsk); newdp->dccps_role = DCCP_ROLE_SERVER; newdp->dccps_hc_rx_ackvec = NULL; newdp->dccps_service_list = NULL; newdp->dccps_service = dreq->dreq_service; newdp->dccps_timestamp_echo = dreq->dreq_timestamp_echo; newdp->dccps_timestamp_time = dreq->dreq_timestamp_time; newicsk->icsk_rto = DCCP_TIMEOUT_INIT; INIT_LIST_HEAD(&newdp->dccps_featneg); /* * Step 3: Process LISTEN state * * Choose S.ISS (initial seqno) or set from Init Cookies * Initialize S.GAR := S.ISS * Set S.ISR, S.GSR from packet (or Init Cookies) * * Setting AWL/AWH and SWL/SWH happens as part of the feature * activation below, as these windows all depend on the local * and remote Sequence Window feature values (7.5.2). */ newdp->dccps_iss = dreq->dreq_iss; newdp->dccps_gss = dreq->dreq_gss; newdp->dccps_gar = newdp->dccps_iss; newdp->dccps_isr = dreq->dreq_isr; newdp->dccps_gsr = dreq->dreq_gsr; /* * Activate features: initialise CCIDs, sequence windows etc. */ if (dccp_feat_activate_values(newsk, &dreq->dreq_featneg)) { /* It is still raw copy of parent, so invalidate * destructor and make plain sk_free() */ newsk->sk_destruct = NULL; sk_free(newsk); return NULL; } dccp_init_xmit_timers(newsk); __DCCP_INC_STATS(DCCP_MIB_PASSIVEOPENS); } return newsk; } EXPORT_SYMBOL_GPL(dccp_create_openreq_child); /* * Process an incoming packet for RESPOND sockets represented * as an request_sock. */ struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, struct request_sock *req) { struct sock *child = NULL; struct dccp_request_sock *dreq = dccp_rsk(req); bool own_req; /* Check for retransmitted REQUEST */ if (dccp_hdr(skb)->dccph_type == DCCP_PKT_REQUEST) { if (after48(DCCP_SKB_CB(skb)->dccpd_seq, dreq->dreq_gsr)) { dccp_pr_debug("Retransmitted REQUEST\n"); dreq->dreq_gsr = DCCP_SKB_CB(skb)->dccpd_seq; /* * Send another RESPONSE packet * To protect against Request floods, increment retrans * counter (backoff, monitored by dccp_response_timer). */ inet_rtx_syn_ack(sk, req); } /* Network Duplicate, discard packet */ return NULL; } DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_PACKET_ERROR; if (dccp_hdr(skb)->dccph_type != DCCP_PKT_ACK && dccp_hdr(skb)->dccph_type != DCCP_PKT_DATAACK) goto drop; /* Invalid ACK */ if (!between48(DCCP_SKB_CB(skb)->dccpd_ack_seq, dreq->dreq_iss, dreq->dreq_gss)) { dccp_pr_debug("Invalid ACK number: ack_seq=%llu, " "dreq_iss=%llu, dreq_gss=%llu\n", (unsigned long long) DCCP_SKB_CB(skb)->dccpd_ack_seq, (unsigned long long) dreq->dreq_iss, (unsigned long long) dreq->dreq_gss); goto drop; } if (dccp_parse_options(sk, dreq, skb)) goto drop; child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL, req, &own_req); if (!child) goto listen_overflow; return inet_csk_complete_hashdance(sk, child, req, own_req); listen_overflow: dccp_pr_debug("listen_overflow!\n"); DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; drop: if (dccp_hdr(skb)->dccph_type != DCCP_PKT_RESET) req->rsk_ops->send_reset(sk, skb); inet_csk_reqsk_queue_drop(sk, req); return NULL; } EXPORT_SYMBOL_GPL(dccp_check_req); /* * Queue segment on the new socket if the new socket is active, * otherwise we just shortcircuit this and continue with * the new socket. */ int dccp_child_process(struct sock *parent, struct sock *child, struct sk_buff *skb) { int ret = 0; const int state = child->sk_state; if (!sock_owned_by_user(child)) { ret = dccp_rcv_state_process(child, skb, dccp_hdr(skb), skb->len); /* Wakeup parent, send SIGIO */ if (state == DCCP_RESPOND && child->sk_state != state) parent->sk_data_ready(parent); } else { /* Alas, it is possible again, because we do lookup * in main socket hash table and lock on listening * socket does not protect us more. */ __sk_add_backlog(child, skb); } bh_unlock_sock(child); sock_put(child); return ret; } EXPORT_SYMBOL_GPL(dccp_child_process); void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, struct request_sock *rsk) { DCCP_BUG("DCCP-ACK packets are never sent in LISTEN/RESPOND state"); } EXPORT_SYMBOL_GPL(dccp_reqsk_send_ack); int dccp_reqsk_init(struct request_sock *req, struct dccp_sock const *dp, struct sk_buff const *skb) { struct dccp_request_sock *dreq = dccp_rsk(req); inet_rsk(req)->ir_rmt_port = dccp_hdr(skb)->dccph_sport; inet_rsk(req)->ir_num = ntohs(dccp_hdr(skb)->dccph_dport); inet_rsk(req)->acked = 0; dreq->dreq_timestamp_echo = 0; /* inherit feature negotiation options from listening socket */ return dccp_feat_clone_list(&dp->dccps_featneg, &dreq->dreq_featneg); } EXPORT_SYMBOL_GPL(dccp_reqsk_init); Alexey Brodkin. 2) Fix DMA API debugging splats in gianfar driver, from Arseny Solokha. 3) Fix off-by-one error in __ip6_append_data(), from Vlad Yasevich. 4) cls_flow does not match on icmpv6 codes properly, from Simon Horman. 5) Initial MAC address can be set incorrectly in some scenerios, from Ivan Vecera. 6) Packet header pointer arithmetic fix in ip6_tnl_parse_tlv_end_lim(), from Dan Carpenter. 7) Fix divide by zero in __tcp_select_window(), from Eric Dumazet. 8) Fix crash in iwlwifi when unregistering thermal zone, from Jens Axboe. 9) Check for DMA mapping errors in starfire driver, from Alexey Khoroshilov. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (31 commits) tcp: fix 0 divide in __tcp_select_window() ipv6: pointer math error in ip6_tnl_parse_tlv_enc_lim() net: fix ndo_features_check/ndo_fix_features comment ordering net/sched: matchall: Fix configuration race be2net: fix initial MAC setting ipv6: fix flow labels when the traffic class is non-0 net: thunderx: avoid dereferencing xcv when NULL net/sched: cls_flower: Correct matching on ICMPv6 code ipv6: Paritially checksum full MTU frames net/mlx4_core: Avoid command timeouts during VF driver device shutdown gianfar: synchronize DMA API usage by free_skb_rx_queue w/ gfar_new_page net: ethtool: add support for 2500BaseT and 5000BaseT link modes can: bcm: fix hrtimer/tasklet termination in bcm op removal net: adaptec: starfire: add checks for dma mapping errors net: phy: micrel: KSZ8795 do not set SUPPORTED_[Asym_]Pause can: Fix kernel panic at security_sock_rcv_skb net: macb: Fix 64 bit addressing support for GEM stmmac: Discard masked flags in interrupt status register net/mlx5e: Check ets capability before ets query FW command net/mlx5e: Fix update of hash function/key via ethtool ...
Diffstat (limited to 'drivers/usb/renesas_usbhs')