| File: | netinet/tcp_debug.c |
| Warning: | line 162, column 4 Value stored to 'th' is never read |
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| 1 | /* $OpenBSD: tcp_debug.c,v 1.30 2022/02/22 01:15:02 guenther Exp $ */ |
| 2 | /* $NetBSD: tcp_debug.c,v 1.10 1996/02/13 23:43:36 christos Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1982, 1986, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | * |
| 32 | * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 |
| 33 | * |
| 34 | * NRL grants permission for redistribution and use in source and binary |
| 35 | * forms, with or without modification, of the software and documentation |
| 36 | * created at NRL provided that the following conditions are met: |
| 37 | * |
| 38 | * 1. Redistributions of source code must retain the above copyright |
| 39 | * notice, this list of conditions and the following disclaimer. |
| 40 | * 2. Redistributions in binary form must reproduce the above copyright |
| 41 | * notice, this list of conditions and the following disclaimer in the |
| 42 | * documentation and/or other materials provided with the distribution. |
| 43 | * 3. All advertising materials mentioning features or use of this software |
| 44 | * must display the following acknowledgements: |
| 45 | * This product includes software developed by the University of |
| 46 | * California, Berkeley and its contributors. |
| 47 | * This product includes software developed at the Information |
| 48 | * Technology Division, US Naval Research Laboratory. |
| 49 | * 4. Neither the name of the NRL nor the names of its contributors |
| 50 | * may be used to endorse or promote products derived from this software |
| 51 | * without specific prior written permission. |
| 52 | * |
| 53 | * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS |
| 54 | * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 55 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| 56 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR |
| 57 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 58 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 59 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 60 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 61 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 62 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 63 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 64 | * |
| 65 | * The views and conclusions contained in the software and documentation |
| 66 | * are those of the authors and should not be interpreted as representing |
| 67 | * official policies, either expressed or implied, of the US Naval |
| 68 | * Research Laboratory (NRL). |
| 69 | */ |
| 70 | |
| 71 | #ifdef TCPDEBUG |
| 72 | /* load symbolic names */ |
| 73 | #define PRUREQUESTS |
| 74 | #define TCPSTATES |
| 75 | #define TCPTIMERS |
| 76 | #define TANAMES |
| 77 | #endif |
| 78 | |
| 79 | #include <sys/param.h> |
| 80 | #include <sys/systm.h> |
| 81 | #include <sys/mbuf.h> |
| 82 | #include <sys/socket.h> |
| 83 | |
| 84 | #include <net/route.h> |
| 85 | |
| 86 | #include <netinet/in.h> |
| 87 | #include <netinet/in_systm.h> |
| 88 | #include <netinet/ip.h> |
| 89 | #include <netinet/in_pcb.h> |
| 90 | #include <netinet/ip_var.h> |
| 91 | #include <netinet/tcp.h> |
| 92 | #include <netinet/tcp_timer.h> |
| 93 | #include <netinet/tcp_var.h> |
| 94 | #include <netinet/tcp_debug.h> |
| 95 | #include <netinet/tcp_fsm.h> |
| 96 | |
| 97 | #ifdef INET61 |
| 98 | #include <netinet/ip6.h> |
| 99 | #endif /* INET6 */ |
| 100 | |
| 101 | #ifdef TCPDEBUG |
| 102 | int tcpconsdebug = 0; |
| 103 | #endif |
| 104 | |
| 105 | struct tcp_debug tcp_debug[TCP_NDEBUG100]; |
| 106 | int tcp_debx; |
| 107 | |
| 108 | /* |
| 109 | * Tcp debug routines |
| 110 | */ |
| 111 | void |
| 112 | tcp_trace(short act, short ostate, struct tcpcb *tp, struct tcpcb *otp, |
| 113 | caddr_t headers, int req, int len) |
| 114 | { |
| 115 | #ifdef TCPDEBUG |
| 116 | tcp_seq seq, ack; |
| 117 | int flags; |
| 118 | #endif |
| 119 | int pf = PF_UNSPEC0; |
| 120 | struct tcp_debug *td = &tcp_debug[tcp_debx++]; |
| 121 | struct tcpiphdr *ti = (struct tcpiphdr *)headers; |
| 122 | struct tcpipv6hdr *ti6 = (struct tcpipv6hdr *)headers; |
| 123 | struct tcphdr *th; |
| 124 | |
| 125 | if (tcp_debx == TCP_NDEBUG100) |
| 126 | tcp_debx = 0; |
| 127 | td->td_time = iptime(); |
| 128 | td->td_act = act; |
| 129 | td->td_ostate = ostate; |
| 130 | td->td_tcb = (caddr_t)otp; |
| 131 | if (tp) { |
| 132 | pf = tp->pf; |
| 133 | td->td_cb = *tp; |
| 134 | } else |
| 135 | bzero((caddr_t)&td->td_cb, sizeof (*tp))__builtin_bzero(((caddr_t)&td->td_cb), (sizeof (*tp))); |
| 136 | |
| 137 | bzero(&td->td_ti6, sizeof(struct tcpipv6hdr))__builtin_bzero((&td->td_ti6), (sizeof(struct tcpipv6hdr ))); |
| 138 | bzero(&td->td_ti, sizeof(struct tcpiphdr))__builtin_bzero((&td->td_ti), (sizeof(struct tcpiphdr) )); |
| 139 | if (headers) { |
| 140 | /* The address family may be in tcpcb or ip header. */ |
| 141 | if (pf == PF_UNSPEC0) { |
| 142 | switch (ti6->ti6_i.ip6_vfcip6_ctlun.ip6_un2_vfc & IPV6_VERSION_MASK0xf0) { |
| 143 | #ifdef INET61 |
| 144 | case IPV6_VERSION0x60: |
| 145 | pf = PF_INET624; |
| 146 | break; |
| 147 | #endif /* INET6 */ |
| 148 | case IPVERSION4: |
| 149 | pf = PF_INET2; |
| 150 | break; |
| 151 | } |
| 152 | } |
| 153 | switch (pf) { |
| 154 | #ifdef INET61 |
| 155 | case PF_INET624: |
| 156 | th = &ti6->ti6_t; |
| 157 | td->td_ti6 = *ti6; |
| 158 | td->td_ti6.ti6_plenti6_i.ip6_ctlun.ip6_un1.ip6_un1_plen = len; |
| 159 | break; |
| 160 | #endif /* INET6 */ |
| 161 | case PF_INET2: |
| 162 | th = &ti->ti_t; |
Value stored to 'th' is never read | |
| 163 | td->td_ti = *ti; |
| 164 | td->td_ti.ti_lenti_i.ih_len = len; |
| 165 | break; |
| 166 | default: |
| 167 | headers = NULL((void *)0); |
| 168 | break; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | td->td_req = req; |
| 173 | #ifdef TCPDEBUG |
| 174 | if (tcpconsdebug == 0) |
| 175 | return; |
| 176 | if (otp) |
| 177 | printf("%p %s:", otp, tcpstates[ostate]); |
| 178 | else |
| 179 | printf("???????? "); |
| 180 | printf("%s ", tanames[act]); |
| 181 | switch (act) { |
| 182 | |
| 183 | case TA_INPUT0: |
| 184 | case TA_OUTPUT1: |
| 185 | case TA_DROP4: |
| 186 | if (headers == NULL((void *)0)) |
| 187 | break; |
| 188 | seq = th->th_seq; |
| 189 | ack = th->th_ack; |
| 190 | if (act == TA_OUTPUT1) { |
| 191 | seq = ntohl(seq)(__uint32_t)(__builtin_constant_p(seq) ? (__uint32_t)(((__uint32_t )(seq) & 0xff) << 24 | ((__uint32_t)(seq) & 0xff00 ) << 8 | ((__uint32_t)(seq) & 0xff0000) >> 8 | ((__uint32_t)(seq) & 0xff000000) >> 24) : __swap32md (seq)); |
| 192 | ack = ntohl(ack)(__uint32_t)(__builtin_constant_p(ack) ? (__uint32_t)(((__uint32_t )(ack) & 0xff) << 24 | ((__uint32_t)(ack) & 0xff00 ) << 8 | ((__uint32_t)(ack) & 0xff0000) >> 8 | ((__uint32_t)(ack) & 0xff000000) >> 24) : __swap32md (ack)); |
| 193 | } |
| 194 | if (len) |
| 195 | printf("[%x..%x)", seq, seq+len); |
| 196 | else |
| 197 | printf("%x", seq); |
| 198 | printf("@%x, urp=%x", ack, th->th_urp); |
| 199 | flags = th->th_flags; |
| 200 | if (flags) { |
| 201 | char *cp = "<"; |
| 202 | #define pf(f) { if (th->th_flags&TH_##f) { printf("%s%s", cp, #f); cp = ","; } } |
| 203 | pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG); |
| 204 | printf(">"); |
| 205 | } |
| 206 | break; |
| 207 | |
| 208 | case TA_USER2: |
| 209 | printf("%s", prurequests[req]); |
| 210 | break; |
| 211 | |
| 212 | case TA_TIMER5: |
| 213 | printf("%s", tcptimers[req]); |
| 214 | break; |
| 215 | } |
| 216 | if (tp) |
| 217 | printf(" -> %s", tcpstates[tp->t_state]); |
| 218 | /* print out internal state of tp !?! */ |
| 219 | printf("\n"); |
| 220 | if (tp == NULL((void *)0)) |
| 221 | return; |
| 222 | printf("\trcv_(nxt,wnd,up) (%x,%lx,%x) snd_(una,nxt,max) (%x,%x,%x)\n", |
| 223 | tp->rcv_nxt, tp->rcv_wnd, tp->rcv_up, tp->snd_una, tp->snd_nxt, |
| 224 | tp->snd_max); |
| 225 | printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%lx)\n", |
| 226 | tp->snd_wl1, tp->snd_wl2, tp->snd_wnd); |
| 227 | #endif /* TCPDEBUG */ |
| 228 | } |