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sys/netinet/tcp_timewait.c
| Show First 20 Lines • Show All 223 Lines • ▼ Show 20 Lines | |||||
| * inp is locked, and is unlocked before returning. | * inp is locked, and is unlocked before returning. | ||||
| */ | */ | ||||
| void | void | ||||
| tcp_twstart(struct tcpcb *tp) | tcp_twstart(struct tcpcb *tp) | ||||
| { | { | ||||
| struct tcptw twlocal, *tw; | struct tcptw twlocal, *tw; | ||||
| struct inpcb *inp = tp->t_inpcb; | struct inpcb *inp = tp->t_inpcb; | ||||
| struct socket *so; | struct socket *so; | ||||
| uint32_t recwin; | |||||
| bool acknow, local; | bool acknow, local; | ||||
| #ifdef INET6 | #ifdef INET6 | ||||
| bool isipv6 = inp->inp_inc.inc_flags & INC_ISIPV6; | bool isipv6 = inp->inp_inc.inc_flags & INC_ISIPV6; | ||||
| #endif | #endif | ||||
| INP_INFO_RLOCK_ASSERT(&V_tcbinfo); | INP_INFO_RLOCK_ASSERT(&V_tcbinfo); | ||||
| INP_WLOCK_ASSERT(inp); | INP_WLOCK_ASSERT(inp); | ||||
| ▲ Show 20 Lines • Show All 46 Lines • ▼ Show 20 Lines | #endif | ||||
| * For !local case the tcptw will hold a reference on its inpcb | * For !local case the tcptw will hold a reference on its inpcb | ||||
| * until tcp_twclose is called. | * until tcp_twclose is called. | ||||
| */ | */ | ||||
| tw->tw_inpcb = inp; | tw->tw_inpcb = inp; | ||||
| /* | /* | ||||
| * Recover last window size sent. | * Recover last window size sent. | ||||
| */ | */ | ||||
| if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) | so = inp->inp_socket; | ||||
| tw->last_win = (tp->rcv_adv - tp->rcv_nxt) >> tp->rcv_scale; | recwin = lmin(lmax(sbspace(&so->so_rcv), 0), | ||||
| else | (long)TCP_MAXWIN << tp->rcv_scale); | ||||
| tw->last_win = 0; | if (recwin < (so->so_rcv.sb_hiwat / 4) && | ||||
| recwin < tp->t_maxseg) | |||||
| recwin = 0; | |||||
| if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) && | |||||
| recwin < (tp->rcv_adv - tp->rcv_nxt)) | |||||
| recwin = (tp->rcv_adv - tp->rcv_nxt); | |||||
| tw->last_win = htons((u_short)(recwin >> tp->rcv_scale)); | |||||
| /* | /* | ||||
| * Set t_recent if timestamps are used on the connection. | * Set t_recent if timestamps are used on the connection. | ||||
| */ | */ | ||||
| if ((tp->t_flags & (TF_REQ_TSTMP|TF_RCVD_TSTMP|TF_NOOPT)) == | if ((tp->t_flags & (TF_REQ_TSTMP|TF_RCVD_TSTMP|TF_NOOPT)) == | ||||
| (TF_REQ_TSTMP|TF_RCVD_TSTMP)) { | (TF_REQ_TSTMP|TF_RCVD_TSTMP)) { | ||||
| tw->t_recent = tp->ts_recent; | tw->t_recent = tp->ts_recent; | ||||
| tw->ts_offset = tp->ts_offset; | tw->ts_offset = tp->ts_offset; | ||||
| Show All 20 Lines | */ | ||||
| * First, discard tcpcb state, which includes stopping its timers and | * First, discard tcpcb state, which includes stopping its timers and | ||||
| * freeing it. tcp_discardcb() used to also release the inpcb, but | * freeing it. tcp_discardcb() used to also release the inpcb, but | ||||
| * that work is now done in the caller. | * that work is now done in the caller. | ||||
| * | * | ||||
| * Note: soisdisconnected() call used to be made in tcp_discardcb(), | * Note: soisdisconnected() call used to be made in tcp_discardcb(), | ||||
| * and might not be needed here any longer. | * and might not be needed here any longer. | ||||
| */ | */ | ||||
| tcp_discardcb(tp); | tcp_discardcb(tp); | ||||
| so = inp->inp_socket; | |||||
| soisdisconnected(so); | soisdisconnected(so); | ||||
| tw->tw_so_options = so->so_options; | tw->tw_so_options = so->so_options; | ||||
| inp->inp_flags |= INP_TIMEWAIT; | inp->inp_flags |= INP_TIMEWAIT; | ||||
| if (acknow) | if (acknow) | ||||
| tcp_twrespond(tw, TH_ACK); | tcp_twrespond(tw, TH_ACK); | ||||
| if (local) | if (local) | ||||
| in_pcbdrop(inp); | in_pcbdrop(inp); | ||||
| else { | else { | ||||
| ▲ Show 20 Lines • Show All 413 Lines • Show Last 20 Lines | |||||