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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include "opt_inet.h"
- #include "opt_inet6.h"
- #include "opt_ipsec.h"
- #include "opt_kern_tls.h"
- #include "opt_tcpdebug.h"
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/arb.h>
- #include <sys/callout.h>
- #include <sys/eventhandler.h>
- #ifdef TCP_HHOOK
- #include <sys/hhook.h>
- #endif
- #include <sys/kernel.h>
- #ifdef TCP_HHOOK
- #include <sys/khelp.h>
- #endif
- #ifdef KERN_TLS
- #include <sys/ktls.h>
- #endif
- #include <sys/qmath.h>
- #include <sys/stats.h>
- #include <sys/sysctl.h>
- #include <sys/jail.h>
- #include <sys/malloc.h>
- #include <sys/refcount.h>
- #include <sys/mbuf.h>
- #ifdef INET6
- #include <sys/domain.h>
- #endif
- #include <sys/priv.h>
- #include <sys/proc.h>
- #include <sys/sdt.h>
- #include <sys/socket.h>
- #include <sys/socketvar.h>
- #include <sys/protosw.h>
- #include <sys/random.h>
- #include <vm/uma.h>
- #include <net/route.h>
- #include <net/route/nhop.h>
- #include <net/if.h>
- #include <net/if_var.h>
- #include <net/vnet.h>
- #include <netinet/in.h>
- #include <netinet/in_fib.h>
- #include <netinet/in_kdtrace.h>
- #include <netinet/in_pcb.h>
- #include <netinet/in_systm.h>
- #include <netinet/in_var.h>
- #include <netinet/ip.h>
- #include <netinet/ip_icmp.h>
- #include <netinet/ip_var.h>
- #ifdef INET6
- #include <netinet/icmp6.h>
- #include <netinet/ip6.h>
- #include <netinet6/in6_fib.h>
- #include <netinet6/in6_pcb.h>
- #include <netinet6/ip6_var.h>
- #include <netinet6/scope6_var.h>
- #include <netinet6/nd6.h>
- #endif
- #include <netinet/tcp.h>
- #include <netinet/tcp_fsm.h>
- #include <netinet/tcp_seq.h>
- #include <netinet/tcp_timer.h>
- #include <netinet/tcp_var.h>
- #include <netinet/tcp_log_buf.h>
- #include <netinet/tcp_syncache.h>
- #include <netinet/tcp_hpts.h>
- #include <netinet/cc/cc.h>
- #ifdef INET6
- #include <netinet6/tcp6_var.h>
- #endif
- #include <netinet/tcpip.h>
- #include <netinet/tcp_fastopen.h>
- #ifdef TCPPCAP
- #include <netinet/tcp_pcap.h>
- #endif
- #ifdef TCPDEBUG
- #include <netinet/tcp_debug.h>
- #endif
- #ifdef INET6
- #include <netinet6/ip6protosw.h>
- #endif
- #ifdef TCP_OFFLOAD
- #include <netinet/tcp_offload.h>
- #endif
- #include <netipsec/ipsec_support.h>
- #include <machine/in_cksum.h>
- #include <crypto/siphash/siphash.h>
- #include <security/mac/mac_framework.h>
- VNET_DEFINE(int, tcp_mssdflt) = TCP_MSS;
- #ifdef INET6
- VNET_DEFINE(int, tcp_v6mssdflt) = TCP6_MSS;
- #endif
- #ifdef NETFLIX_EXP_DETECTION
- /* Sack attack detection thresholds and such */
- SYSCTL_NODE(_net_inet_tcp, OID_AUTO, sack_attack,
- CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "Sack Attack detection thresholds");
- int32_t tcp_force_detection = 0;
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, force_detection,
- CTLFLAG_RW,
- &tcp_force_detection, 0,
- "Do we force detection even if the INP has it off?");
- int32_t tcp_sack_to_ack_thresh = 700; /* 70 % */
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sack_to_ack_thresh,
- CTLFLAG_RW,
- &tcp_sack_to_ack_thresh, 700,
- "Percentage of sacks to acks we must see above (10.1 percent is 101)?");
- int32_t tcp_sack_to_move_thresh = 600; /* 60 % */
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, move_thresh,
- CTLFLAG_RW,
- &tcp_sack_to_move_thresh, 600,
- "Percentage of sack moves we must see above (10.1 percent is 101)");
- int32_t tcp_restoral_thresh = 650; /* 65 % (sack:2:ack -5%) */
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, restore_thresh,
- CTLFLAG_RW,
- &tcp_restoral_thresh, 550,
- "Percentage of sack to ack percentage we must see below to restore(10.1 percent is 101)");
- int32_t tcp_sad_decay_val = 800;
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, decay_per,
- CTLFLAG_RW,
- &tcp_sad_decay_val, 800,
- "The decay percentage (10.1 percent equals 101 )");
- int32_t tcp_map_minimum = 500;
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, nummaps,
- CTLFLAG_RW,
- &tcp_map_minimum, 500,
- "Number of Map enteries before we start detection");
- int32_t tcp_attack_on_turns_on_logging = 0;
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, attacks_logged,
- CTLFLAG_RW,
- &tcp_attack_on_turns_on_logging, 0,
- "When we have a positive hit on attack, do we turn on logging?");
- int32_t tcp_sad_pacing_interval = 2000;
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sad_pacing_int,
- CTLFLAG_RW,
- &tcp_sad_pacing_interval, 2000,
- "What is the minimum pacing interval for a classified attacker?");
- int32_t tcp_sad_low_pps = 100;
- SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sad_low_pps,
- CTLFLAG_RW,
- &tcp_sad_low_pps, 100,
- "What is the input pps that below which we do not decay?");
- #endif
- struct rwlock tcp_function_lock;
- static int
- sysctl_net_inet_tcp_mss_check(SYSCTL_HANDLER_ARGS)
- {
- int error, new;
- new = V_tcp_mssdflt;
- error = sysctl_handle_int(oidp, &new, 0, req);
- if (error == 0 && req->newptr) {
- if (new < TCP_MINMSS)
- error = EINVAL;
- else
- V_tcp_mssdflt = new;
- }
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt,
- CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
- &VNET_NAME(tcp_mssdflt), 0, &sysctl_net_inet_tcp_mss_check, "I",
- "Default TCP Maximum Segment Size");
- #ifdef INET6
- static int
- sysctl_net_inet_tcp_mss_v6_check(SYSCTL_HANDLER_ARGS)
- {
- int error, new;
- new = V_tcp_v6mssdflt;
- error = sysctl_handle_int(oidp, &new, 0, req);
- if (error == 0 && req->newptr) {
- if (new < TCP_MINMSS)
- error = EINVAL;
- else
- V_tcp_v6mssdflt = new;
- }
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt,
- CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
- &VNET_NAME(tcp_v6mssdflt), 0, &sysctl_net_inet_tcp_mss_v6_check, "I",
- "Default TCP Maximum Segment Size for IPv6");
- #endif /* INET6 */
- /*
- * Minimum MSS we accept and use. This prevents DoS attacks where
- * we are forced to a ridiculous low MSS like 20 and send hundreds
- * of packets instead of one. The effect scales with the available
- * bandwidth and quickly saturates the CPU and network interface
- * with packet generation and sending. Set to zero to disable MINMSS
- * checking. This setting prevents us from sending too small packets.
- */
- VNET_DEFINE(int, tcp_minmss) = TCP_MINMSS;
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(tcp_minmss), 0,
- "Minimum TCP Maximum Segment Size");
- VNET_DEFINE(int, tcp_do_rfc1323) = 1;
- SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(tcp_do_rfc1323), 0,
- "Enable rfc1323 (high performance TCP) extensions");
- VNET_DEFINE(int, tcp_tolerate_missing_ts) = 0;
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, tolerate_missing_ts, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(tcp_tolerate_missing_ts), 0,
- "Tolerate missing TCP timestamps");
- VNET_DEFINE(int, tcp_ts_offset_per_conn) = 1;
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, ts_offset_per_conn, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(tcp_ts_offset_per_conn), 0,
- "Initialize TCP timestamps per connection instead of per host pair");
- static int tcp_log_debug = 0;
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_debug, CTLFLAG_RW,
- &tcp_log_debug, 0, "Log errors caused by incoming TCP segments");
- static int tcp_tcbhashsize;
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
- &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
- static int do_tcpdrain = 1;
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
- "Enable tcp_drain routine for extra help when low on mbufs");
- SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_VNET | CTLFLAG_RD,
- &VNET_NAME(tcbinfo.ipi_count), 0, "Number of active PCBs");
- VNET_DEFINE_STATIC(int, icmp_may_rst) = 1;
- #define V_icmp_may_rst VNET(icmp_may_rst)
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(icmp_may_rst), 0,
- "Certain ICMP unreachable messages may abort connections in SYN_SENT");
- VNET_DEFINE_STATIC(int, tcp_isn_reseed_interval) = 0;
- #define V_tcp_isn_reseed_interval VNET(tcp_isn_reseed_interval)
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(tcp_isn_reseed_interval), 0,
- "Seconds between reseeding of ISN secret");
- static int tcp_soreceive_stream;
- SYSCTL_INT(_net_inet_tcp, OID_AUTO, soreceive_stream, CTLFLAG_RDTUN,
- &tcp_soreceive_stream, 0, "Using soreceive_stream for TCP sockets");
- VNET_DEFINE(uma_zone_t, sack_hole_zone);
- #define V_sack_hole_zone VNET(sack_hole_zone)
- VNET_DEFINE(uint32_t, tcp_map_entries_limit) = 0; /* unlimited */
- static int
- sysctl_net_inet_tcp_map_limit_check(SYSCTL_HANDLER_ARGS)
- {
- int error;
- uint32_t new;
- new = V_tcp_map_entries_limit;
- error = sysctl_handle_int(oidp, &new, 0, req);
- if (error == 0 && req->newptr) {
- /* only allow "0" and value > minimum */
- if (new > 0 && new < TCP_MIN_MAP_ENTRIES_LIMIT)
- error = EINVAL;
- else
- V_tcp_map_entries_limit = new;
- }
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, OID_AUTO, map_limit,
- CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
- &VNET_NAME(tcp_map_entries_limit), 0,
- &sysctl_net_inet_tcp_map_limit_check, "IU",
- "Total sendmap entries limit");
- VNET_DEFINE(uint32_t, tcp_map_split_limit) = 0; /* unlimited */
- SYSCTL_UINT(_net_inet_tcp, OID_AUTO, split_limit, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(tcp_map_split_limit), 0,
- "Total sendmap split entries limit");
- #ifdef TCP_HHOOK
- VNET_DEFINE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST+1]);
- #endif
- #define TS_OFFSET_SECRET_LENGTH SIPHASH_KEY_LENGTH
- VNET_DEFINE_STATIC(u_char, ts_offset_secret[TS_OFFSET_SECRET_LENGTH]);
- #define V_ts_offset_secret VNET(ts_offset_secret)
- static int tcp_default_fb_init(struct tcpcb *tp);
- static void tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged);
- static int tcp_default_handoff_ok(struct tcpcb *tp);
- static struct inpcb *tcp_notify(struct inpcb *, int);
- static struct inpcb *tcp_mtudisc_notify(struct inpcb *, int);
- static void tcp_mtudisc(struct inpcb *, int);
- static char * tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th,
- void *ip4hdr, const void *ip6hdr);
- static struct tcp_function_block tcp_def_funcblk = {
- .tfb_tcp_block_name = "freebsd",
- .tfb_tcp_output = tcp_output,
- .tfb_tcp_do_segment = tcp_do_segment,
- .tfb_tcp_ctloutput = tcp_default_ctloutput,
- .tfb_tcp_handoff_ok = tcp_default_handoff_ok,
- .tfb_tcp_fb_init = tcp_default_fb_init,
- .tfb_tcp_fb_fini = tcp_default_fb_fini,
- };
- static int tcp_fb_cnt = 0;
- struct tcp_funchead t_functions;
- static struct tcp_function_block *tcp_func_set_ptr = &tcp_def_funcblk;
- static struct tcp_function_block *
- find_tcp_functions_locked(struct tcp_function_set *fs)
- {
- struct tcp_function *f;
- struct tcp_function_block *blk=NULL;
- TAILQ_FOREACH(f, &t_functions, tf_next) {
- if (strcmp(f->tf_name, fs->function_set_name) == 0) {
- blk = f->tf_fb;
- break;
- }
- }
- return(blk);
- }
- static struct tcp_function_block *
- find_tcp_fb_locked(struct tcp_function_block *blk, struct tcp_function **s)
- {
- struct tcp_function_block *rblk=NULL;
- struct tcp_function *f;
- TAILQ_FOREACH(f, &t_functions, tf_next) {
- if (f->tf_fb == blk) {
- rblk = blk;
- if (s) {
- *s = f;
- }
- break;
- }
- }
- return (rblk);
- }
- struct tcp_function_block *
- find_and_ref_tcp_functions(struct tcp_function_set *fs)
- {
- struct tcp_function_block *blk;
- rw_rlock(&tcp_function_lock);
- blk = find_tcp_functions_locked(fs);
- if (blk)
- refcount_acquire(&blk->tfb_refcnt);
- rw_runlock(&tcp_function_lock);
- return(blk);
- }
- struct tcp_function_block *
- find_and_ref_tcp_fb(struct tcp_function_block *blk)
- {
- struct tcp_function_block *rblk;
- rw_rlock(&tcp_function_lock);
- rblk = find_tcp_fb_locked(blk, NULL);
- if (rblk)
- refcount_acquire(&rblk->tfb_refcnt);
- rw_runlock(&tcp_function_lock);
- return(rblk);
- }
- static struct tcp_function_block *
- find_and_ref_tcp_default_fb(void)
- {
- struct tcp_function_block *rblk;
- rw_rlock(&tcp_function_lock);
- rblk = tcp_func_set_ptr;
- refcount_acquire(&rblk->tfb_refcnt);
- rw_runlock(&tcp_function_lock);
- return (rblk);
- }
- void
- tcp_switch_back_to_default(struct tcpcb *tp)
- {
- struct tcp_function_block *tfb;
- KASSERT(tp->t_fb != &tcp_def_funcblk,
- ("%s: called by the built-in default stack", __func__));
- /*
- * Release the old stack. This function will either find a new one
- * or panic.
- */
- if (tp->t_fb->tfb_tcp_fb_fini != NULL)
- (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
- refcount_release(&tp->t_fb->tfb_refcnt);
- /*
- * Now, we'll find a new function block to use.
- * Start by trying the current user-selected
- * default, unless this stack is the user-selected
- * default.
- */
- tfb = find_and_ref_tcp_default_fb();
- if (tfb == tp->t_fb) {
- refcount_release(&tfb->tfb_refcnt);
- tfb = NULL;
- }
- /* Does the stack accept this connection? */
- if (tfb != NULL && tfb->tfb_tcp_handoff_ok != NULL &&
- (*tfb->tfb_tcp_handoff_ok)(tp)) {
- refcount_release(&tfb->tfb_refcnt);
- tfb = NULL;
- }
- /* Try to use that stack. */
- if (tfb != NULL) {
- /* Initialize the new stack. If it succeeds, we are done. */
- tp->t_fb = tfb;
- if (tp->t_fb->tfb_tcp_fb_init == NULL ||
- (*tp->t_fb->tfb_tcp_fb_init)(tp) == 0)
- return;
- /*
- * Initialization failed. Release the reference count on
- * the stack.
- */
- refcount_release(&tfb->tfb_refcnt);
- }
- /*
- * If that wasn't feasible, use the built-in default
- * stack which is not allowed to reject anyone.
- */
- tfb = find_and_ref_tcp_fb(&tcp_def_funcblk);
- if (tfb == NULL) {
- /* there always should be a default */
- panic("Can't refer to tcp_def_funcblk");
- }
- if (tfb->tfb_tcp_handoff_ok != NULL) {
- if ((*tfb->tfb_tcp_handoff_ok) (tp)) {
- /* The default stack cannot say no */
- panic("Default stack rejects a new session?");
- }
- }
- tp->t_fb = tfb;
- if (tp->t_fb->tfb_tcp_fb_init != NULL &&
- (*tp->t_fb->tfb_tcp_fb_init)(tp)) {
- /* The default stack cannot fail */
- panic("Default stack initialization failed");
- }
- }
- static int
- sysctl_net_inet_default_tcp_functions(SYSCTL_HANDLER_ARGS)
- {
- int error=ENOENT;
- struct tcp_function_set fs;
- struct tcp_function_block *blk;
- memset(&fs, 0, sizeof(fs));
- rw_rlock(&tcp_function_lock);
- blk = find_tcp_fb_locked(tcp_func_set_ptr, NULL);
- if (blk) {
- /* Found him */
- strcpy(fs.function_set_name, blk->tfb_tcp_block_name);
- fs.pcbcnt = blk->tfb_refcnt;
- }
- rw_runlock(&tcp_function_lock);
- error = sysctl_handle_string(oidp, fs.function_set_name,
- sizeof(fs.function_set_name), req);
- /* Check for error or no change */
- if (error != 0 || req->newptr == NULL)
- return(error);
- rw_wlock(&tcp_function_lock);
- blk = find_tcp_functions_locked(&fs);
- if ((blk == NULL) ||
- (blk->tfb_flags & TCP_FUNC_BEING_REMOVED)) {
- error = ENOENT;
- goto done;
- }
- tcp_func_set_ptr = blk;
- done:
- rw_wunlock(&tcp_function_lock);
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_default,
- CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
- NULL, 0, sysctl_net_inet_default_tcp_functions, "A",
- "Set/get the default TCP functions");
- static int
- sysctl_net_inet_list_available(SYSCTL_HANDLER_ARGS)
- {
- int error, cnt, linesz;
- struct tcp_function *f;
- char *buffer, *cp;
- size_t bufsz, outsz;
- bool alias;
- cnt = 0;
- rw_rlock(&tcp_function_lock);
- TAILQ_FOREACH(f, &t_functions, tf_next) {
- cnt++;
- }
- rw_runlock(&tcp_function_lock);
- bufsz = (cnt+2) * ((TCP_FUNCTION_NAME_LEN_MAX * 2) + 13) + 1;
- buffer = malloc(bufsz, M_TEMP, M_WAITOK);
- error = 0;
- cp = buffer;
- linesz = snprintf(cp, bufsz, "\n%-32s%c %-32s %s\n", "Stack", 'D',
- "Alias", "PCB count");
- cp += linesz;
- bufsz -= linesz;
- outsz = linesz;
- rw_rlock(&tcp_function_lock);
- TAILQ_FOREACH(f, &t_functions, tf_next) {
- alias = (f->tf_name != f->tf_fb->tfb_tcp_block_name);
- linesz = snprintf(cp, bufsz, "%-32s%c %-32s %u\n",
- f->tf_fb->tfb_tcp_block_name,
- (f->tf_fb == tcp_func_set_ptr) ? '*' : ' ',
- alias ? f->tf_name : "-",
- f->tf_fb->tfb_refcnt);
- if (linesz >= bufsz) {
- error = EOVERFLOW;
- break;
- }
- cp += linesz;
- bufsz -= linesz;
- outsz += linesz;
- }
- rw_runlock(&tcp_function_lock);
- if (error == 0)
- error = sysctl_handle_string(oidp, buffer, outsz + 1, req);
- free(buffer, M_TEMP);
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_available,
- CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
- NULL, 0, sysctl_net_inet_list_available, "A",
- "list available TCP Function sets");
- /*
- * Exports one (struct tcp_function_info) for each alias/name.
- */
- static int
- sysctl_net_inet_list_func_info(SYSCTL_HANDLER_ARGS)
- {
- int cnt, error;
- struct tcp_function *f;
- struct tcp_function_info tfi;
- /*
- * We don't allow writes.
- */
- if (req->newptr != NULL)
- return (EINVAL);
- /*
- * Wire the old buffer so we can directly copy the functions to
- * user space without dropping the lock.
- */
- if (req->oldptr != NULL) {
- error = sysctl_wire_old_buffer(req, 0);
- if (error)
- return (error);
- }
- /*
- * Walk the list and copy out matching entries. If INVARIANTS
- * is compiled in, also walk the list to verify the length of
- * the list matches what we have recorded.
- */
- rw_rlock(&tcp_function_lock);
- cnt = 0;
- #ifndef INVARIANTS
- if (req->oldptr == NULL) {
- cnt = tcp_fb_cnt;
- goto skip_loop;
- }
- #endif
- TAILQ_FOREACH(f, &t_functions, tf_next) {
- #ifdef INVARIANTS
- cnt++;
- #endif
- if (req->oldptr != NULL) {
- bzero(&tfi, sizeof(tfi));
- tfi.tfi_refcnt = f->tf_fb->tfb_refcnt;
- tfi.tfi_id = f->tf_fb->tfb_id;
- (void)strlcpy(tfi.tfi_alias, f->tf_name,
- sizeof(tfi.tfi_alias));
- (void)strlcpy(tfi.tfi_name,
- f->tf_fb->tfb_tcp_block_name, sizeof(tfi.tfi_name));
- error = SYSCTL_OUT(req, &tfi, sizeof(tfi));
- /*
- * Don't stop on error, as that is the
- * mechanism we use to accumulate length
- * information if the buffer was too short.
- */
- }
- }
- KASSERT(cnt == tcp_fb_cnt,
- ("%s: cnt (%d) != tcp_fb_cnt (%d)", __func__, cnt, tcp_fb_cnt));
- #ifndef INVARIANTS
- skip_loop:
- #endif
- rw_runlock(&tcp_function_lock);
- if (req->oldptr == NULL)
- error = SYSCTL_OUT(req, NULL,
- (cnt + 1) * sizeof(struct tcp_function_info));
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, OID_AUTO, function_info,
- CTLTYPE_OPAQUE | CTLFLAG_SKIP | CTLFLAG_RD | CTLFLAG_MPSAFE,
- NULL, 0, sysctl_net_inet_list_func_info, "S,tcp_function_info",
- "List TCP function block name-to-ID mappings");
- /*
- * tfb_tcp_handoff_ok() function for the default stack.
- * Note that we'll basically try to take all comers.
- */
- static int
- tcp_default_handoff_ok(struct tcpcb *tp)
- {
- return (0);
- }
- /*
- * tfb_tcp_fb_init() function for the default stack.
- *
- * This handles making sure we have appropriate timers set if you are
- * transitioning a socket that has some amount of setup done.
- *
- * The init() fuction from the default can *never* return non-zero i.e.
- * it is required to always succeed since it is the stack of last resort!
- */
- static int
- tcp_default_fb_init(struct tcpcb *tp)
- {
- struct socket *so;
- INP_WLOCK_ASSERT(tp->t_inpcb);
- KASSERT(tp->t_state >= 0 && tp->t_state < TCPS_TIME_WAIT,
- ("%s: connection %p in unexpected state %d", __func__, tp,
- tp->t_state));
- /*
- * Nothing to do for ESTABLISHED or LISTEN states. And, we don't
- * know what to do for unexpected states (which includes TIME_WAIT).
- */
- if (tp->t_state <= TCPS_LISTEN || tp->t_state >= TCPS_TIME_WAIT)
- return (0);
- /*
- * Make sure some kind of transmission timer is set if there is
- * outstanding data.
- */
- so = tp->t_inpcb->inp_socket;
- if ((!TCPS_HAVEESTABLISHED(tp->t_state) || sbavail(&so->so_snd) ||
- tp->snd_una != tp->snd_max) && !(tcp_timer_active(tp, TT_REXMT) ||
- tcp_timer_active(tp, TT_PERSIST))) {
- /*
- * If the session has established and it looks like it should
- * be in the persist state, set the persist timer. Otherwise,
- * set the retransmit timer.
- */
- if (TCPS_HAVEESTABLISHED(tp->t_state) && tp->snd_wnd == 0 &&
- (int32_t)(tp->snd_nxt - tp->snd_una) <
- (int32_t)sbavail(&so->so_snd))
- tcp_setpersist(tp);
- else
- tcp_timer_activate(tp, TT_REXMT, tp->t_rxtcur);
- }
- /* All non-embryonic sessions get a keepalive timer. */
- if (!tcp_timer_active(tp, TT_KEEP))
- tcp_timer_activate(tp, TT_KEEP,
- TCPS_HAVEESTABLISHED(tp->t_state) ? TP_KEEPIDLE(tp) :
- TP_KEEPINIT(tp));
- /*
- * Make sure critical variables are initialized
- * if transitioning while in Recovery.
- */
- if IN_FASTRECOVERY(tp->t_flags) {
- if (tp->sackhint.recover_fs == 0)
- tp->sackhint.recover_fs = max(1,
- tp->snd_nxt - tp->snd_una);
- }
- return (0);
- }
- /*
- * tfb_tcp_fb_fini() function for the default stack.
- *
- * This changes state as necessary (or prudent) to prepare for another stack
- * to assume responsibility for the connection.
- */
- static void
- tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged)
- {
- INP_WLOCK_ASSERT(tp->t_inpcb);
- return;
- }
- /*
- * Target size of TCP PCB hash tables. Must be a power of two.
- *
- * Note that this can be overridden by the kernel environment
- * variable net.inet.tcp.tcbhashsize
- */
- #ifndef TCBHASHSIZE
- #define TCBHASHSIZE 0
- #endif
- /*
- * XXX
- * Callouts should be moved into struct tcp directly. They are currently
- * separate because the tcpcb structure is exported to userland for sysctl
- * parsing purposes, which do not know about callouts.
- */
- struct tcpcb_mem {
- struct tcpcb tcb;
- struct tcp_timer tt;
- struct cc_var ccv;
- #ifdef TCP_HHOOK
- struct osd osd;
- #endif
- };
- VNET_DEFINE_STATIC(uma_zone_t, tcpcb_zone);
- #define V_tcpcb_zone VNET(tcpcb_zone)
- MALLOC_DEFINE(M_TCPLOG, "tcplog", "TCP address and flags print buffers");
- MALLOC_DEFINE(M_TCPFUNCTIONS, "tcpfunc", "TCP function set memory");
- static struct mtx isn_mtx;
- #define ISN_LOCK_INIT() mtx_init(&isn_mtx, "isn_mtx", NULL, MTX_DEF)
- #define ISN_LOCK() mtx_lock(&isn_mtx)
- #define ISN_UNLOCK() mtx_unlock(&isn_mtx)
- /*
- * TCP initialization.
- */
- static void
- tcp_zone_change(void *tag)
- {
- uma_zone_set_max(V_tcbinfo.ipi_zone, maxsockets);
- uma_zone_set_max(V_tcpcb_zone, maxsockets);
- tcp_tw_zone_change();
- }
- static int
- tcp_inpcb_init(void *mem, int size, int flags)
- {
- struct inpcb *inp = mem;
- INP_LOCK_INIT(inp, "inp", "tcpinp");
- return (0);
- }
- /*
- * Take a value and get the next power of 2 that doesn't overflow.
- * Used to size the tcp_inpcb hash buckets.
- */
- static int
- maketcp_hashsize(int size)
- {
- int hashsize;
- /*
- * auto tune.
- * get the next power of 2 higher than maxsockets.
- */
- hashsize = 1 << fls(size);
- /* catch overflow, and just go one power of 2 smaller */
- if (hashsize < size) {
- hashsize = 1 << (fls(size) - 1);
- }
- return (hashsize);
- }
- static volatile int next_tcp_stack_id = 1;
- /*
- * Register a TCP function block with the name provided in the names
- * array. (Note that this function does NOT automatically register
- * blk->tfb_tcp_block_name as a stack name. Therefore, you should
- * explicitly include blk->tfb_tcp_block_name in the list of names if
- * you wish to register the stack with that name.)
- *
- * Either all name registrations will succeed or all will fail. If
- * a name registration fails, the function will update the num_names
- * argument to point to the array index of the name that encountered
- * the failure.
- *
- * Returns 0 on success, or an error code on failure.
- */
- int
- register_tcp_functions_as_names(struct tcp_function_block *blk, int wait,
- const char *names[], int *num_names)
- {
- struct tcp_function *n;
- struct tcp_function_set fs;
- int error, i;
- KASSERT(names != NULL && *num_names > 0,
- ("%s: Called with 0-length name list", __func__));
- KASSERT(names != NULL, ("%s: Called with NULL name list", __func__));
- KASSERT(rw_initialized(&tcp_function_lock),
- ("%s: called too early", __func__));
- if ((blk->tfb_tcp_output == NULL) ||
- (blk->tfb_tcp_do_segment == NULL) ||
- (blk->tfb_tcp_ctloutput == NULL) ||
- (strlen(blk->tfb_tcp_block_name) == 0)) {
- /*
- * These functions are required and you
- * need a name.
- */
- *num_names = 0;
- return (EINVAL);
- }
- if (blk->tfb_tcp_timer_stop_all ||
- blk->tfb_tcp_timer_activate ||
- blk->tfb_tcp_timer_active ||
- blk->tfb_tcp_timer_stop) {
- /*
- * If you define one timer function you
- * must have them all.
- */
- if ((blk->tfb_tcp_timer_stop_all == NULL) ||
- (blk->tfb_tcp_timer_activate == NULL) ||
- (blk->tfb_tcp_timer_active == NULL) ||
- (blk->tfb_tcp_timer_stop == NULL)) {
- *num_names = 0;
- return (EINVAL);
- }
- }
- if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
- *num_names = 0;
- return (EINVAL);
- }
- refcount_init(&blk->tfb_refcnt, 0);
- blk->tfb_id = atomic_fetchadd_int(&next_tcp_stack_id, 1);
- for (i = 0; i < *num_names; i++) {
- n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait);
- if (n == NULL) {
- error = ENOMEM;
- goto cleanup;
- }
- n->tf_fb = blk;
- (void)strlcpy(fs.function_set_name, names[i],
- sizeof(fs.function_set_name));
- rw_wlock(&tcp_function_lock);
- if (find_tcp_functions_locked(&fs) != NULL) {
- /* Duplicate name space not allowed */
- rw_wunlock(&tcp_function_lock);
- free(n, M_TCPFUNCTIONS);
- error = EALREADY;
- goto cleanup;
- }
- (void)strlcpy(n->tf_name, names[i], sizeof(n->tf_name));
- TAILQ_INSERT_TAIL(&t_functions, n, tf_next);
- tcp_fb_cnt++;
- rw_wunlock(&tcp_function_lock);
- }
- return(0);
- cleanup:
- /*
- * Deregister the names we just added. Because registration failed
- * for names[i], we don't need to deregister that name.
- */
- *num_names = i;
- rw_wlock(&tcp_function_lock);
- while (--i >= 0) {
- TAILQ_FOREACH(n, &t_functions, tf_next) {
- if (!strncmp(n->tf_name, names[i],
- TCP_FUNCTION_NAME_LEN_MAX)) {
- TAILQ_REMOVE(&t_functions, n, tf_next);
- tcp_fb_cnt--;
- n->tf_fb = NULL;
- free(n, M_TCPFUNCTIONS);
- break;
- }
- }
- }
- rw_wunlock(&tcp_function_lock);
- return (error);
- }
- /*
- * Register a TCP function block using the name provided in the name
- * argument.
- *
- * Returns 0 on success, or an error code on failure.
- */
- int
- register_tcp_functions_as_name(struct tcp_function_block *blk, const char *name,
- int wait)
- {
- const char *name_list[1];
- int num_names, rv;
- num_names = 1;
- if (name != NULL)
- name_list[0] = name;
- else
- name_list[0] = blk->tfb_tcp_block_name;
- rv = register_tcp_functions_as_names(blk, wait, name_list, &num_names);
- return (rv);
- }
- /*
- * Register a TCP function block using the name defined in
- * blk->tfb_tcp_block_name.
- *
- * Returns 0 on success, or an error code on failure.
- */
- int
- register_tcp_functions(struct tcp_function_block *blk, int wait)
- {
- return (register_tcp_functions_as_name(blk, NULL, wait));
- }
- /*
- * Deregister all names associated with a function block. This
- * functionally removes the function block from use within the system.
- *
- * When called with a true quiesce argument, mark the function block
- * as being removed so no more stacks will use it and determine
- * whether the removal would succeed.
- *
- * When called with a false quiesce argument, actually attempt the
- * removal.
- *
- * When called with a force argument, attempt to switch all TCBs to
- * use the default stack instead of returning EBUSY.
- *
- * Returns 0 on success (or if the removal would succeed, or an error
- * code on failure.
- */
- int
- deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
- bool force)
- {
- struct tcp_function *f;
- if (blk == &tcp_def_funcblk) {
- /* You can't un-register the default */
- return (EPERM);
- }
- rw_wlock(&tcp_function_lock);
- if (blk == tcp_func_set_ptr) {
- /* You can't free the current default */
- rw_wunlock(&tcp_function_lock);
- return (EBUSY);
- }
- /* Mark the block so no more stacks can use it. */
- blk->tfb_flags |= TCP_FUNC_BEING_REMOVED;
- /*
- * If TCBs are still attached to the stack, attempt to switch them
- * to the default stack.
- */
- if (force && blk->tfb_refcnt) {
- struct inpcb *inp;
- struct tcpcb *tp;
- VNET_ITERATOR_DECL(vnet_iter);
- rw_wunlock(&tcp_function_lock);
- VNET_LIST_RLOCK();
- VNET_FOREACH(vnet_iter) {
- CURVNET_SET(vnet_iter);
- INP_INFO_WLOCK(&V_tcbinfo);
- CK_LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
- INP_WLOCK(inp);
- if (inp->inp_flags & INP_TIMEWAIT) {
- INP_WUNLOCK(inp);
- continue;
- }
- tp = intotcpcb(inp);
- if (tp == NULL || tp->t_fb != blk) {
- INP_WUNLOCK(inp);
- continue;
- }
- tcp_switch_back_to_default(tp);
- INP_WUNLOCK(inp);
- }
- INP_INFO_WUNLOCK(&V_tcbinfo);
- CURVNET_RESTORE();
- }
- VNET_LIST_RUNLOCK();
- rw_wlock(&tcp_function_lock);
- }
- if (blk->tfb_refcnt) {
- /* TCBs still attached. */
- rw_wunlock(&tcp_function_lock);
- return (EBUSY);
- }
- if (quiesce) {
- /* Skip removal. */
- rw_wunlock(&tcp_function_lock);
- return (0);
- }
- /* Remove any function names that map to this function block. */
- while (find_tcp_fb_locked(blk, &f) != NULL) {
- TAILQ_REMOVE(&t_functions, f, tf_next);
- tcp_fb_cnt--;
- f->tf_fb = NULL;
- free(f, M_TCPFUNCTIONS);
- }
- rw_wunlock(&tcp_function_lock);
- return (0);
- }
- void
- tcp_init(void)
- {
- const char *tcbhash_tuneable;
- int hashsize;
- tcbhash_tuneable = "net.inet.tcp.tcbhashsize";
- #ifdef TCP_HHOOK
- if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN,
- &V_tcp_hhh[HHOOK_TCP_EST_IN], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
- printf("%s: WARNING: unable to register helper hook\n", __func__);
- if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT,
- &V_tcp_hhh[HHOOK_TCP_EST_OUT], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
- printf("%s: WARNING: unable to register helper hook\n", __func__);
- #endif
- #ifdef STATS
- if (tcp_stats_init())
- printf("%s: WARNING: unable to initialise TCP stats\n",
- __func__);
- #endif
- hashsize = TCBHASHSIZE;
- TUNABLE_INT_FETCH(tcbhash_tuneable, &hashsize);
- if (hashsize == 0) {
- /*
- * Auto tune the hash size based on maxsockets.
- * A perfect hash would have a 1:1 mapping
- * (hashsize = maxsockets) however it's been
- * suggested that O(2) average is better.
- */
- hashsize = maketcp_hashsize(maxsockets / 4);
- /*
- * Our historical default is 512,
- * do not autotune lower than this.
- */
- if (hashsize < 512)
- hashsize = 512;
- if (bootverbose && IS_DEFAULT_VNET(curvnet))
- printf("%s: %s auto tuned to %d\n", __func__,
- tcbhash_tuneable, hashsize);
- }
- /*
- * We require a hashsize to be a power of two.
- * Previously if it was not a power of two we would just reset it
- * back to 512, which could be a nasty surprise if you did not notice
- * the error message.
- * Instead what we do is clip it to the closest power of two lower
- * than the specified hash value.
- */
- if (!powerof2(hashsize)) {
- int oldhashsize = hashsize;
- hashsize = maketcp_hashsize(hashsize);
- /* prevent absurdly low value */
- if (hashsize < 16)
- hashsize = 16;
- printf("%s: WARNING: TCB hash size not a power of 2, "
- "clipped from %d to %d.\n", __func__, oldhashsize,
- hashsize);
- }
- in_pcbinfo_init(&V_tcbinfo, "tcp", &V_tcb, hashsize, hashsize,
- "tcp_inpcb", tcp_inpcb_init, IPI_HASHFIELDS_4TUPLE);
- /*
- * These have to be type stable for the benefit of the timers.
- */
- V_tcpcb_zone = uma_zcreate("tcpcb", sizeof(struct tcpcb_mem),
- NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
- uma_zone_set_max(V_tcpcb_zone, maxsockets);
- uma_zone_set_warning(V_tcpcb_zone, "kern.ipc.maxsockets limit reached");
- tcp_tw_init();
- syncache_init();
- tcp_hc_init();
- TUNABLE_INT_FETCH("net.inet.tcp.sack.enable", &V_tcp_do_sack);
- V_sack_hole_zone = uma_zcreate("sackhole", sizeof(struct sackhole),
- NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
- tcp_fastopen_init();
- /* Skip initialization of globals for non-default instances. */
- if (!IS_DEFAULT_VNET(curvnet))
- return;
- tcp_reass_global_init();
- /* XXX virtualize those bellow? */
- tcp_delacktime = TCPTV_DELACK;
- tcp_keepinit = TCPTV_KEEP_INIT;
- tcp_keepidle = TCPTV_KEEP_IDLE;
- tcp_keepintvl = TCPTV_KEEPINTVL;
- tcp_maxpersistidle = TCPTV_KEEP_IDLE;
- tcp_msl = TCPTV_MSL;
- tcp_rexmit_initial = TCPTV_RTOBASE;
- if (tcp_rexmit_initial < 1)
- tcp_rexmit_initial = 1;
- tcp_rexmit_min = TCPTV_MIN;
- if (tcp_rexmit_min < 1)
- tcp_rexmit_min = 1;
- tcp_persmin = TCPTV_PERSMIN;
- tcp_persmax = TCPTV_PERSMAX;
- tcp_rexmit_slop = TCPTV_CPU_VAR;
- tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
- tcp_tcbhashsize = hashsize;
- /* Setup the tcp function block list */
- TAILQ_INIT(&t_functions);
- rw_init(&tcp_function_lock, "tcp_func_lock");
- register_tcp_functions(&tcp_def_funcblk, M_WAITOK);
- #ifdef TCP_BLACKBOX
- /* Initialize the TCP logging data. */
- tcp_log_init();
- #endif
- arc4rand(&V_ts_offset_secret, sizeof(V_ts_offset_secret), 0);
- if (tcp_soreceive_stream) {
- #ifdef INET
- tcp_usrreqs.pru_soreceive = soreceive_stream;
- #endif
- #ifdef INET6
- tcp6_usrreqs.pru_soreceive = soreceive_stream;
- #endif /* INET6 */
- }
- #ifdef INET6
- #define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr))
- #else /* INET6 */
- #define TCP_MINPROTOHDR (sizeof(struct tcpiphdr))
- #endif /* INET6 */
- if (max_protohdr < TCP_MINPROTOHDR)
- max_protohdr = TCP_MINPROTOHDR;
- if (max_linkhdr + TCP_MINPROTOHDR > MHLEN)
- panic("tcp_init");
- #undef TCP_MINPROTOHDR
- ISN_LOCK_INIT();
- EVENTHANDLER_REGISTER(shutdown_pre_sync, tcp_fini, NULL,
- SHUTDOWN_PRI_DEFAULT);
- EVENTHANDLER_REGISTER(maxsockets_change, tcp_zone_change, NULL,
- EVENTHANDLER_PRI_ANY);
- tcp_inp_lro_direct_queue = counter_u64_alloc(M_WAITOK);
- tcp_inp_lro_wokeup_queue = counter_u64_alloc(M_WAITOK);
- tcp_inp_lro_compressed = counter_u64_alloc(M_WAITOK);
- tcp_inp_lro_single_push = counter_u64_alloc(M_WAITOK);
- tcp_inp_lro_locks_taken = counter_u64_alloc(M_WAITOK);
- tcp_inp_lro_sack_wake = counter_u64_alloc(M_WAITOK);
- #ifdef TCPPCAP
- tcp_pcap_init();
- #endif
- }
- #ifdef VIMAGE
- static void
- tcp_destroy(void *unused __unused)
- {
- int n;
- #ifdef TCP_HHOOK
- int error;
- #endif
- /*
- * All our processes are gone, all our sockets should be cleaned
- * up, which means, we should be past the tcp_discardcb() calls.
- * Sleep to let all tcpcb timers really disappear and cleanup.
- */
- for (;;) {
- INP_LIST_RLOCK(&V_tcbinfo);
- n = V_tcbinfo.ipi_count;
- INP_LIST_RUNLOCK(&V_tcbinfo);
- if (n == 0)
- break;
- pause("tcpdes", hz / 10);
- }
- tcp_hc_destroy();
- syncache_destroy();
- tcp_tw_destroy();
- in_pcbinfo_destroy(&V_tcbinfo);
- /* tcp_discardcb() clears the sack_holes up. */
- uma_zdestroy(V_sack_hole_zone);
- uma_zdestroy(V_tcpcb_zone);
- /*
- * Cannot free the zone until all tcpcbs are released as we attach
- * the allocations to them.
- */
- tcp_fastopen_destroy();
- #ifdef TCP_HHOOK
- error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_IN]);
- if (error != 0) {
- printf("%s: WARNING: unable to deregister helper hook "
- "type=%d, id=%d: error %d returned\n", __func__,
- HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN, error);
- }
- error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_OUT]);
- if (error != 0) {
- printf("%s: WARNING: unable to deregister helper hook "
- "type=%d, id=%d: error %d returned\n", __func__,
- HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT, error);
- }
- #endif
- }
- VNET_SYSUNINIT(tcp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, tcp_destroy, NULL);
- #endif
- void
- tcp_fini(void *xtp)
- {
- }
- /*
- * Fill in the IP and TCP headers for an outgoing packet, given the tcpcb.
- * tcp_template used to store this data in mbufs, but we now recopy it out
- * of the tcpcb each time to conserve mbufs.
- */
- void
- tcpip_fillheaders(struct inpcb *inp, void *ip_ptr, void *tcp_ptr)
- {
- struct tcphdr *th = (struct tcphdr *)tcp_ptr;
- INP_WLOCK_ASSERT(inp);
- #ifdef INET6
- if ((inp->inp_vflag & INP_IPV6) != 0) {
- struct ip6_hdr *ip6;
- ip6 = (struct ip6_hdr *)ip_ptr;
- ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
- (inp->inp_flow & IPV6_FLOWINFO_MASK);
- ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
- (IPV6_VERSION & IPV6_VERSION_MASK);
- ip6->ip6_nxt = IPPROTO_TCP;
- ip6->ip6_plen = htons(sizeof(struct tcphdr));
- ip6->ip6_src = inp->in6p_laddr;
- ip6->ip6_dst = inp->in6p_faddr;
- }
- #endif /* INET6 */
- #if defined(INET6) && defined(INET)
- else
- #endif
- #ifdef INET
- {
- struct ip *ip;
- ip = (struct ip *)ip_ptr;
- ip->ip_v = IPVERSION;
- ip->ip_hl = 5;
- ip->ip_tos = inp->inp_ip_tos;
- ip->ip_len = 0;
- ip->ip_id = 0;
- ip->ip_off = 0;
- ip->ip_ttl = inp->inp_ip_ttl;
- ip->ip_sum = 0;
- ip->ip_p = IPPROTO_TCP;
- ip->ip_src = inp->inp_laddr;
- ip->ip_dst = inp->inp_faddr;
- }
- #endif /* INET */
- th->th_sport = inp->inp_lport;
- th->th_dport = inp->inp_fport;
- th->th_seq = 0;
- th->th_ack = 0;
- th->th_x2 = 0;
- th->th_off = 5;
- th->th_flags = 0;
- th->th_win = 0;
- th->th_urp = 0;
- th->th_sum = 0; /* in_pseudo() is called later for ipv4 */
- }
- /*
- * Create template to be used to send tcp packets on a connection.
- * Allocates an mbuf and fills in a skeletal tcp/ip header. The only
- * use for this function is in keepalives, which use tcp_respond.
- */
- struct tcptemp *
- tcpip_maketemplate(struct inpcb *inp)
- {
- struct tcptemp *t;
- t = malloc(sizeof(*t), M_TEMP, M_NOWAIT);
- if (t == NULL)
- return (NULL);
- tcpip_fillheaders(inp, (void *)&t->tt_ipgen, (void *)&t->tt_t);
- return (t);
- }
- /*
- * Send a single message to the TCP at address specified by
- * the given TCP/IP header. If m == NULL, then we make a copy
- * of the tcpiphdr at th and send directly to the addressed host.
- * This is used to force keep alive messages out using the TCP
- * template for a connection. If flags are given then we send
- * a message back to the TCP which originated the segment th,
- * and discard the mbuf containing it and any other attached mbufs.
- *
- * In any case the ack and sequence number of the transmitted
- * segment are as specified by the parameters.
- *
- * NOTE: If m != NULL, then th must point to *inside* the mbuf.
- */
- void
- tcp_respond(struct tcpcb *tp, void *ipgen, struct tcphdr *th, struct mbuf *m,
- tcp_seq ack, tcp_seq seq, int flags)
- {
- struct tcpopt to;
- struct inpcb *inp;
- struct ip *ip;
- struct mbuf *optm;
- struct tcphdr *nth;
- u_char *optp;
- #ifdef INET6
- struct ip6_hdr *ip6;
- int isipv6;
- #endif /* INET6 */
- int optlen, tlen, win;
- bool incl_opts;
- KASSERT(tp != NULL || m != NULL, ("tcp_respond: tp and m both NULL"));
- NET_EPOCH_ASSERT();
- #ifdef INET6
- isipv6 = ((struct ip *)ipgen)->ip_v == (IPV6_VERSION >> 4);
- ip6 = ipgen;
- #endif /* INET6 */
- ip = ipgen;
- if (tp != NULL) {
- inp = tp->t_inpcb;
- KASSERT(inp != NULL, ("tcp control block w/o inpcb"));
- INP_WLOCK_ASSERT(inp);
- } else
- inp = NULL;
- incl_opts = false;
- win = 0;
- if (tp != NULL) {
- if (!(flags & TH_RST)) {
- win = sbspace(&inp->inp_socket->so_rcv);
- if (win > TCP_MAXWIN << tp->rcv_scale)
- win = TCP_MAXWIN << tp->rcv_scale;
- }
- if ((tp->t_flags & TF_NOOPT) == 0)
- incl_opts = true;
- }
- if (m == NULL) {
- m = m_gethdr(M_NOWAIT, MT_DATA);
- if (m == NULL)
- return;
- m->m_data += max_linkhdr;
- #ifdef INET6
- if (isipv6) {
- bcopy((caddr_t)ip6, mtod(m, caddr_t),
- sizeof(struct ip6_hdr));
- ip6 = mtod(m, struct ip6_hdr *);
- nth = (struct tcphdr *)(ip6 + 1);
- } else
- #endif /* INET6 */
- {
- bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
- ip = mtod(m, struct ip *);
- nth = (struct tcphdr *)(ip + 1);
- }
- bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
- flags = TH_ACK;
- } else if (!M_WRITABLE(m)) {
- struct mbuf *n;
- /* Can't reuse 'm', allocate a new mbuf. */
- n = m_gethdr(M_NOWAIT, MT_DATA);
- if (n == NULL) {
- m_freem(m);
- return;
- }
- if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
- m_freem(m);
- m_freem(n);
- return;
- }
- n->m_data += max_linkhdr;
- /* m_len is set later */
- #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
- #ifdef INET6
- if (isipv6) {
- bcopy((caddr_t)ip6, mtod(n, caddr_t),
- sizeof(struct ip6_hdr));
- ip6 = mtod(n, struct ip6_hdr *);
- xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
- nth = (struct tcphdr *)(ip6 + 1);
- } else
- #endif /* INET6 */
- {
- bcopy((caddr_t)ip, mtod(n, caddr_t), sizeof(struct ip));
- ip = mtod(n, struct ip *);
- xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
- nth = (struct tcphdr *)(ip + 1);
- }
- bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
- xchg(nth->th_dport, nth->th_sport, uint16_t);
- th = nth;
- m_freem(m);
- m = n;
- } else {
- /*
- * reuse the mbuf.
- * XXX MRT We inherit the FIB, which is lucky.
- */
- m_freem(m->m_next);
- m->m_next = NULL;
- m->m_data = (caddr_t)ipgen;
- /* m_len is set later */
- #ifdef INET6
- if (isipv6) {
- xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
- nth = (struct tcphdr *)(ip6 + 1);
- } else
- #endif /* INET6 */
- {
- xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
- nth = (struct tcphdr *)(ip + 1);
- }
- if (th != nth) {
- /*
- * this is usually a case when an extension header
- * exists between the IPv6 header and the
- * TCP header.
- */
- nth->th_sport = th->th_sport;
- nth->th_dport = th->th_dport;
- }
- xchg(nth->th_dport, nth->th_sport, uint16_t);
- #undef xchg
- }
- tlen = 0;
- #ifdef INET6
- if (isipv6)
- tlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
- #endif
- #if defined(INET) && defined(INET6)
- else
- #endif
- #ifdef INET
- tlen = sizeof (struct tcpiphdr);
- #endif
- #ifdef INVARIANTS
- m->m_len = 0;
- KASSERT(M_TRAILINGSPACE(m) >= tlen,
- ("Not enough trailing space for message (m=%p, need=%d, have=%ld)",
- m, tlen, (long)M_TRAILINGSPACE(m)));
- #endif
- m->m_len = tlen;
- to.to_flags = 0;
- if (incl_opts) {
- /* Make sure we have room. */
- if (M_TRAILINGSPACE(m) < TCP_MAXOLEN) {
- m->m_next = m_get(M_NOWAIT, MT_DATA);
- if (m->m_next) {
- optp = mtod(m->m_next, u_char *);
- optm = m->m_next;
- } else
- incl_opts = false;
- } else {
- optp = (u_char *) (nth + 1);
- optm = m;
- }
- }
- if (incl_opts) {
- /* Timestamps. */
- if (tp->t_flags & TF_RCVD_TSTMP) {
- to.to_tsval = tcp_ts_getticks() + tp->ts_offset;
- to.to_tsecr = tp->ts_recent;
- to.to_flags |= TOF_TS;
- }
- #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
- /* TCP-MD5 (RFC2385). */
- if (tp->t_flags & TF_SIGNATURE)
- to.to_flags |= TOF_SIGNATURE;
- #endif
- /* Add the options. */
- tlen += optlen = tcp_addoptions(&to, optp);
- /* Update m_len in the correct mbuf. */
- optm->m_len += optlen;
- } else
- optlen = 0;
- #ifdef INET6
- if (isipv6) {
- ip6->ip6_flow = 0;
- ip6->ip6_vfc = IPV6_VERSION;
- ip6->ip6_nxt = IPPROTO_TCP;
- ip6->ip6_plen = htons(tlen - sizeof(*ip6));
- }
- #endif
- #if defined(INET) && defined(INET6)
- else
- #endif
- #ifdef INET
- {
- ip->ip_len = htons(tlen);
- ip->ip_ttl = V_ip_defttl;
- if (V_path_mtu_discovery)
- ip->ip_off |= htons(IP_DF);
- }
- #endif
- m->m_pkthdr.len = tlen;
- m->m_pkthdr.rcvif = NULL;
- #ifdef MAC
- if (inp != NULL) {
- /*
- * Packet is associated with a socket, so allow the
- * label of the response to reflect the socket label.
- */
- INP_WLOCK_ASSERT(inp);
- mac_inpcb_create_mbuf(inp, m);
- } else {
- /*
- * Packet is not associated with a socket, so possibly
- * update the label in place.
- */
- mac_netinet_tcp_reply(m);
- }
- #endif
- nth->th_seq = htonl(seq);
- nth->th_ack = htonl(ack);
- nth->th_x2 = 0;
- nth->th_off = (sizeof (struct tcphdr) + optlen) >> 2;
- nth->th_flags = flags;
- if (tp != NULL)
- nth->th_win = htons((u_short) (win >> tp->rcv_scale));
- else
- nth->th_win = htons((u_short)win);
- nth->th_urp = 0;
- #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
- if (to.to_flags & TOF_SIGNATURE) {
- if (!TCPMD5_ENABLED() ||
- TCPMD5_OUTPUT(m, nth, to.to_signature) != 0) {
- m_freem(m);
- return;
- }
- }
- #endif
- m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
- #ifdef INET6
- if (isipv6) {
- m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
- nth->th_sum = in6_cksum_pseudo(ip6,
- tlen - sizeof(struct ip6_hdr), IPPROTO_TCP, 0);
- ip6->ip6_hlim = in6_selecthlim(tp != NULL ? tp->t_inpcb :
- NULL, NULL);
- }
- #endif /* INET6 */
- #if defined(INET6) && defined(INET)
- else
- #endif
- #ifdef INET
- {
- m->m_pkthdr.csum_flags = CSUM_TCP;
- nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
- htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p)));
- }
- #endif /* INET */
- #ifdef TCPDEBUG
- if (tp == NULL || (inp->inp_socket->so_options & SO_DEBUG))
- tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0);
- #endif
- TCP_PROBE3(debug__output, tp, th, m);
- if (flags & TH_RST)
- TCP_PROBE5(accept__refused, NULL, NULL, m, tp, nth);
- #ifdef INET6
- if (isipv6) {
- TCP_PROBE5(send, NULL, tp, ip6, tp, nth);
- (void)ip6_output(m, NULL, NULL, 0, NULL, NULL, inp);
- }
- #endif /* INET6 */
- #if defined(INET) && defined(INET6)
- else
- #endif
- #ifdef INET
- {
- TCP_PROBE5(send, NULL, tp, ip, tp, nth);
- (void)ip_output(m, NULL, NULL, 0, NULL, inp);
- }
- #endif
- }
- /*
- * Create a new TCP control block, making an
- * empty reassembly queue and hooking it to the argument
- * protocol control block. The `inp' parameter must have
- * come from the zone allocator set up in tcp_init().
- */
- struct tcpcb *
- tcp_newtcpcb(struct inpcb *inp)
- {
- struct tcpcb_mem *tm;
- struct tcpcb *tp;
- #ifdef INET6
- int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
- #endif /* INET6 */
- tm = uma_zalloc(V_tcpcb_zone, M_NOWAIT | M_ZERO);
- if (tm == NULL)
- return (NULL);
- tp = &tm->tcb;
- /* Initialise cc_var struct for this tcpcb. */
- tp->ccv = &tm->ccv;
- tp->ccv->type = IPPROTO_TCP;
- tp->ccv->ccvc.tcp = tp;
- rw_rlock(&tcp_function_lock);
- tp->t_fb = tcp_func_set_ptr;
- refcount_acquire(&tp->t_fb->tfb_refcnt);
- rw_runlock(&tcp_function_lock);
- /*
- * Use the current system default CC algorithm.
- */
- CC_LIST_RLOCK();
- KASSERT(!STAILQ_EMPTY(&cc_list), ("cc_list is empty!"));
- CC_ALGO(tp) = CC_DEFAULT();
- CC_LIST_RUNLOCK();
- /*
- * The tcpcb will hold a reference on its inpcb until tcp_discardcb()
- * is called.
- */
- in_pcbref(inp); /* Reference for tcpcb */
- tp->t_inpcb = inp;
- if (CC_ALGO(tp)->cb_init != NULL)
- if (CC_ALGO(tp)->cb_init(tp->ccv) > 0) {
- if (tp->t_fb->tfb_tcp_fb_fini)
- (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
- in_pcbrele_wlocked(inp);
- refcount_release(&tp->t_fb->tfb_refcnt);
- uma_zfree(V_tcpcb_zone, tm);
- return (NULL);
- }
- #ifdef TCP_HHOOK
- tp->osd = &tm->osd;
- if (khelp_init_osd(HELPER_CLASS_TCP, tp->osd)) {
- if (tp->t_fb->tfb_tcp_fb_fini)
- (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
- in_pcbrele_wlocked(inp);
- refcount_release(&tp->t_fb->tfb_refcnt);
- uma_zfree(V_tcpcb_zone, tm);
- return (NULL);
- }
- #endif
- #ifdef VIMAGE
- tp->t_vnet = inp->inp_vnet;
- #endif
- tp->t_timers = &tm->tt;
- TAILQ_INIT(&tp->t_segq);
- tp->t_maxseg =
- #ifdef INET6
- isipv6 ? V_tcp_v6mssdflt :
- #endif /* INET6 */
- V_tcp_mssdflt;
- /* Set up our timeouts. */
- callout_init(&tp->t_timers->tt_rexmt, 1);
- callout_init(&tp->t_timers->tt_persist, 1);
- callout_init(&tp->t_timers->tt_keep, 1);
- callout_init(&tp->t_timers->tt_2msl, 1);
- callout_init(&tp->t_timers->tt_delack, 1);
- if (V_tcp_do_rfc1323)
- tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
- if (V_tcp_do_sack)
- tp->t_flags |= TF_SACK_PERMIT;
- TAILQ_INIT(&tp->snd_holes);
- /*
- * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
- * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
- * reasonable initial retransmit time.
- */
- tp->t_srtt = TCPTV_SRTTBASE;
- tp->t_rttvar = ((tcp_rexmit_initial - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
- tp->t_rttmin = tcp_rexmit_min;
- tp->t_rxtcur = tcp_rexmit_initial;
- tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
- tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
- tp->t_rcvtime = ticks;
- /*
- * IPv4 TTL initialization is necessary for an IPv6 socket as well,
- * because the socket may be bound to an IPv6 wildcard address,
- * which may match an IPv4-mapped IPv6 address.
- */
- inp->inp_ip_ttl = V_ip_defttl;
- inp->inp_ppcb = tp;
- #ifdef TCPPCAP
- /*
- * Init the TCP PCAP queues.
- */
- tcp_pcap_tcpcb_init(tp);
- #endif
- #ifdef TCP_BLACKBOX
- /* Initialize the per-TCPCB log data. */
- tcp_log_tcpcbinit(tp);
- #endif
- tp->t_pacing_rate = -1;
- if (tp->t_fb->tfb_tcp_fb_init) {
- if ((*tp->t_fb->tfb_tcp_fb_init)(tp)) {
- refcount_release(&tp->t_fb->tfb_refcnt);
- in_pcbrele_wlocked(inp);
- uma_zfree(V_tcpcb_zone, tm);
- return (NULL);
- }
- }
- #ifdef STATS
- if (V_tcp_perconn_stats_enable == 1)
- tp->t_stats = stats_blob_alloc(V_tcp_perconn_stats_dflt_tpl, 0);
- #endif
- return (tp); /* XXX */
- }
- /*
- * Switch the congestion control algorithm back to NewReno for any active
- * control blocks using an algorithm which is about to go away.
- * This ensures the CC framework can allow the unload to proceed without leaving
- * any dangling pointers which would trigger a panic.
- * Returning non-zero would inform the CC framework that something went wrong
- * and it would be unsafe to allow the unload to proceed. However, there is no
- * way for this to occur with this implementation so we always return zero.
- */
- int
- tcp_ccalgounload(struct cc_algo *unload_algo)
- {
- struct cc_algo *tmpalgo;
- struct inpcb *inp;
- struct tcpcb *tp;
- VNET_ITERATOR_DECL(vnet_iter);
- /*
- * Check all active control blocks across all network stacks and change
- * any that are using "unload_algo" back to NewReno. If "unload_algo"
- * requires cleanup code to be run, call it.
- */
- VNET_LIST_RLOCK();
- VNET_FOREACH(vnet_iter) {
- CURVNET_SET(vnet_iter);
- INP_INFO_WLOCK(&V_tcbinfo);
- /*
- * New connections already part way through being initialised
- * with the CC algo we're removing will not race with this code
- * because the INP_INFO_WLOCK is held during initialisation. We
- * therefore don't enter the loop below until the connection
- * list has stabilised.
- */
- CK_LIST_FOREACH(inp, &V_tcb, inp_list) {
- INP_WLOCK(inp);
- /* Important to skip tcptw structs. */
- if (!(inp->inp_flags & INP_TIMEWAIT) &&
- (tp = intotcpcb(inp)) != NULL) {
- /*
- * By holding INP_WLOCK here, we are assured
- * that the connection is not currently
- * executing inside the CC module's functions
- * i.e. it is safe to make the switch back to
- * NewReno.
- */
- if (CC_ALGO(tp) == unload_algo) {
- tmpalgo = CC_ALGO(tp);
- if (tmpalgo->cb_destroy != NULL)
- tmpalgo->cb_destroy(tp->ccv);
- CC_DATA(tp) = NULL;
- /*
- * NewReno may allocate memory on
- * demand for certain stateful
- * configuration as needed, but is
- * coded to never fail on memory
- * allocation failure so it is a safe
- * fallback.
- */
- CC_ALGO(tp) = &newreno_cc_algo;
- }
- }
- INP_WUNLOCK(inp);
- }
- INP_INFO_WUNLOCK(&V_tcbinfo);
- CURVNET_RESTORE();
- }
- VNET_LIST_RUNLOCK();
- return (0);
- }
- /*
- * Drop a TCP connection, reporting
- * the specified error. If connection is synchronized,
- * then send a RST to peer.
- */
- struct tcpcb *
- tcp_drop(struct tcpcb *tp, int errno)
- {
- struct socket *so = tp->t_inpcb->inp_socket;
- NET_EPOCH_ASSERT();
- INP_INFO_LOCK_ASSERT(&V_tcbinfo);
- INP_WLOCK_ASSERT(tp->t_inpcb);
- if (TCPS_HAVERCVDSYN(tp->t_state)) {
- tcp_state_change(tp, TCPS_CLOSED);
- (void) tp->t_fb->tfb_tcp_output(tp);
- TCPSTAT_INC(tcps_drops);
- } else
- TCPSTAT_INC(tcps_conndrops);
- if (errno == ETIMEDOUT && tp->t_softerror)
- errno = tp->t_softerror;
- so->so_error = errno;
- return (tcp_close(tp));
- }
- void
- tcp_discardcb(struct tcpcb *tp)
- {
- struct inpcb *inp = tp->t_inpcb;
- struct socket *so = inp->inp_socket;
- #ifdef INET6
- int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
- #endif /* INET6 */
- int released __unused;
- INP_WLOCK_ASSERT(inp);
- /*
- * Make sure that all of our timers are stopped before we delete the
- * PCB.
- *
- * If stopping a timer fails, we schedule a discard function in same
- * callout, and the last discard function called will take care of
- * deleting the tcpcb.
- */
- tp->t_timers->tt_draincnt = 0;
- tcp_timer_stop(tp, TT_REXMT);
- tcp_timer_stop(tp, TT_PERSIST);
- tcp_timer_stop(tp, TT_KEEP);
- tcp_timer_stop(tp, TT_2MSL);
- tcp_timer_stop(tp, TT_DELACK);
- if (tp->t_fb->tfb_tcp_timer_stop_all) {
- /*
- * Call the stop-all function of the methods,
- * this function should call the tcp_timer_stop()
- * method with each of the function specific timeouts.
- * That stop will be called via the tfb_tcp_timer_stop()
- * which should use the async drain function of the
- * callout system (see tcp_var.h).
- */
- tp->t_fb->tfb_tcp_timer_stop_all(tp);
- }
- /*
- * If we got enough samples through the srtt filter,
- * save the rtt and rttvar in the routing entry.
- * 'Enough' is arbitrarily defined as 4 rtt samples.
- * 4 samples is enough for the srtt filter to converge
- * to within enough % of the correct value; fewer samples
- * and we could save a bogus rtt. The danger is not high
- * as tcp quickly recovers from everything.
- * XXX: Works very well but needs some more statistics!
- */
- if (tp->t_rttupdated >= 4) {
- struct hc_metrics_lite metrics;
- uint32_t ssthresh;
- bzero(&metrics, sizeof(metrics));
- /*
- * Update the ssthresh always when the conditions below
- * are satisfied. This gives us better new start value
- * for the congestion avoidance for new connections.
- * ssthresh is only set if packet loss occurred on a session.
- *
- * XXXRW: 'so' may be NULL here, and/or socket buffer may be
- * being torn down. Ideally this code would not use 'so'.
- */
- ssthresh = tp->snd_ssthresh;
- if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) {
- /*
- * convert the limit from user data bytes to
- * packets then to packet data bytes.
- */
- ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg;
- if (ssthresh < 2)
- ssthresh = 2;
- ssthresh *= (tp->t_maxseg +
- #ifdef INET6
- (isipv6 ? sizeof (struct ip6_hdr) +
- sizeof (struct tcphdr) :
- #endif
- sizeof (struct tcpiphdr)
- #ifdef INET6
- )
- #endif
- );
- } else
- ssthresh = 0;
- metrics.rmx_ssthresh = ssthresh;
- metrics.rmx_rtt = tp->t_srtt;
- metrics.rmx_rttvar = tp->t_rttvar;
- metrics.rmx_cwnd = tp->snd_cwnd;
- metrics.rmx_sendpipe = 0;
- metrics.rmx_recvpipe = 0;
- tcp_hc_update(&inp->inp_inc, &metrics);
- }
- /* free the reassembly queue, if any */
- tcp_reass_flush(tp);
- #ifdef TCP_OFFLOAD
- /* Disconnect offload device, if any. */
- if (tp->t_flags & TF_TOE)
- tcp_offload_detach(tp);
- #endif
- tcp_free_sackholes(tp);
- #ifdef TCPPCAP
- /* Free the TCP PCAP queues. */
- tcp_pcap_drain(&(tp->t_inpkts));
- tcp_pcap_drain(&(tp->t_outpkts));
- #endif
- /* Allow the CC algorithm to clean up after itself. */
- if (CC_ALGO(tp)->cb_destroy != NULL)
- CC_ALGO(tp)->cb_destroy(tp->ccv);
- CC_DATA(tp) = NULL;
- #ifdef TCP_HHOOK
- khelp_destroy_osd(tp->osd);
- #endif
- #ifdef STATS
- stats_blob_destroy(tp->t_stats);
- #endif
- CC_ALGO(tp) = NULL;
- inp->inp_ppcb = NULL;
- if (tp->t_timers->tt_draincnt == 0) {
- /* We own the last reference on tcpcb, let's free it. */
- #ifdef TCP_BLACKBOX
- tcp_log_tcpcbfini(tp);
- #endif
- TCPSTATES_DEC(tp->t_state);
- if (tp->t_fb->tfb_tcp_fb_fini)
- (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
- refcount_release(&tp->t_fb->tfb_refcnt);
- tp->t_inpcb = NULL;
- uma_zfree(V_tcpcb_zone, tp);
- released = in_pcbrele_wlocked(inp);
- KASSERT(!released, ("%s: inp %p should not have been released "
- "here", __func__, inp));
- }
- }
- void
- tcp_timer_discard(void *ptp)
- {
- struct inpcb *inp;
- struct tcpcb *tp;
- struct epoch_tracker et;
- tp = (struct tcpcb *)ptp;
- CURVNET_SET(tp->t_vnet);
- NET_EPOCH_ENTER(et);
- inp = tp->t_inpcb;
- KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL",
- __func__, tp));
- INP_WLOCK(inp);
- KASSERT((tp->t_timers->tt_flags & TT_STOPPED) != 0,
- ("%s: tcpcb has to be stopped here", __func__));
- tp->t_timers->tt_draincnt--;
- if (tp->t_timers->tt_draincnt == 0) {
- /* We own the last reference on this tcpcb, let's free it. */
- #ifdef TCP_BLACKBOX
- tcp_log_tcpcbfini(tp);
- #endif
- TCPSTATES_DEC(tp->t_state);
- if (tp->t_fb->tfb_tcp_fb_fini)
- (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
- refcount_release(&tp->t_fb->tfb_refcnt);
- tp->t_inpcb = NULL;
- uma_zfree(V_tcpcb_zone, tp);
- if (in_pcbrele_wlocked(inp)) {
- NET_EPOCH_EXIT(et);
- CURVNET_RESTORE();
- return;
- }
- }
- INP_WUNLOCK(inp);
- NET_EPOCH_EXIT(et);
- CURVNET_RESTORE();
- }
- /*
- * Attempt to close a TCP control block, marking it as dropped, and freeing
- * the socket if we hold the only reference.
- */
- struct tcpcb *
- tcp_close(struct tcpcb *tp)
- {
- struct inpcb *inp = tp->t_inpcb;
- struct socket *so;
- INP_INFO_LOCK_ASSERT(&V_tcbinfo);
- INP_WLOCK_ASSERT(inp);
- #ifdef TCP_OFFLOAD
- if (tp->t_state == TCPS_LISTEN)
- tcp_offload_listen_stop(tp);
- #endif
- /*
- * This releases the TFO pending counter resource for TFO listen
- * sockets as well as passively-created TFO sockets that transition
- * from SYN_RECEIVED to CLOSED.
- */
- if (tp->t_tfo_pending) {
- tcp_fastopen_decrement_counter(tp->t_tfo_pending);
- tp->t_tfo_pending = NULL;
- }
- in_pcbdrop(inp);
- TCPSTAT_INC(tcps_closed);
- if (tp->t_state != TCPS_CLOSED)
- tcp_state_change(tp, TCPS_CLOSED);
- KASSERT(inp->inp_socket != NULL, ("tcp_close: inp_socket NULL"));
- so = inp->inp_socket;
- soisdisconnected(so);
- if (inp->inp_flags & INP_SOCKREF) {
- KASSERT(so->so_state & SS_PROTOREF,
- ("tcp_close: !SS_PROTOREF"));
- inp->inp_flags &= ~INP_SOCKREF;
- INP_WUNLOCK(inp);
- SOCK_LOCK(so);
- so->so_state &= ~SS_PROTOREF;
- sofree(so);
- return (NULL);
- }
- return (tp);
- }
- void
- tcp_drain(void)
- {
- VNET_ITERATOR_DECL(vnet_iter);
- if (!do_tcpdrain)
- return;
- VNET_LIST_RLOCK_NOSLEEP();
- VNET_FOREACH(vnet_iter) {
- CURVNET_SET(vnet_iter);
- struct inpcb *inpb;
- struct tcpcb *tcpb;
- /*
- * Walk the tcpbs, if existing, and flush the reassembly queue,
- * if there is one...
- * XXX: The "Net/3" implementation doesn't imply that the TCP
- * reassembly queue should be flushed, but in a situation
- * where we're really low on mbufs, this is potentially
- * useful.
- */
- INP_INFO_WLOCK(&V_tcbinfo);
- CK_LIST_FOREACH(inpb, V_tcbinfo.ipi_listhead, inp_list) {
- INP_WLOCK(inpb);
- if (inpb->inp_flags & INP_TIMEWAIT) {
- INP_WUNLOCK(inpb);
- continue;
- }
- if ((tcpb = intotcpcb(inpb)) != NULL) {
- tcp_reass_flush(tcpb);
- tcp_clean_sackreport(tcpb);
- #ifdef TCP_BLACKBOX
- tcp_log_drain(tcpb);
- #endif
- #ifdef TCPPCAP
- if (tcp_pcap_aggressive_free) {
- /* Free the TCP PCAP queues. */
- tcp_pcap_drain(&(tcpb->t_inpkts));
- tcp_pcap_drain(&(tcpb->t_outpkts));
- }
- #endif
- }
- INP_WUNLOCK(inpb);
- }
- INP_INFO_WUNLOCK(&V_tcbinfo);
- CURVNET_RESTORE();
- }
- VNET_LIST_RUNLOCK_NOSLEEP();
- }
- /*
- * Notify a tcp user of an asynchronous error;
- * store error as soft error, but wake up user
- * (for now, won't do anything until can select for soft error).
- *
- * Do not wake up user since there currently is no mechanism for
- * reporting soft errors (yet - a kqueue filter may be added).
- */
- static struct inpcb *
- tcp_notify(struct inpcb *inp, int error)
- {
- struct tcpcb *tp;
- INP_INFO_LOCK_ASSERT(&V_tcbinfo);
- INP_WLOCK_ASSERT(inp);
- if ((inp->inp_flags & INP_TIMEWAIT) ||
- (inp->inp_flags & INP_DROPPED))
- return (inp);
- tp = intotcpcb(inp);
- KASSERT(tp != NULL, ("tcp_notify: tp == NULL"));
- /*
- * Ignore some errors if we are hooked up.
- * If connection hasn't completed, has retransmitted several times,
- * and receives a second error, give up now. This is better
- * than waiting a long time to establish a connection that
- * can never complete.
- */
- if (tp->t_state == TCPS_ESTABLISHED &&
- (error == EHOSTUNREACH || error == ENETUNREACH ||
- error == EHOSTDOWN)) {
- if (inp->inp_route.ro_nh) {
- NH_FREE(inp->inp_route.ro_nh);
- inp->inp_route.ro_nh = (struct nhop_object *)NULL;
- }
- return (inp);
- } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 &&
- tp->t_softerror) {
- tp = tcp_drop(tp, error);
- if (tp != NULL)
- return (inp);
- else
- return (NULL);
- } else {
- tp->t_softerror = error;
- return (inp);
- }
- #if 0
- wakeup( &so->so_timeo);
- sorwakeup(so);
- sowwakeup(so);
- #endif
- }
- static int
- tcp_pcblist(SYSCTL_HANDLER_ARGS)
- {
- struct epoch_tracker et;
- struct inpcb *inp;
- struct xinpgen xig;
- int error;
- if (req->newptr != NULL)
- return (EPERM);
- if (req->oldptr == NULL) {
- int n;
- n = V_tcbinfo.ipi_count +
- counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
- n += imax(n / 8, 10);
- req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xtcpcb);
- return (0);
- }
- if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
- return (error);
- bzero(&xig, sizeof(xig));
- xig.xig_len = sizeof xig;
- xig.xig_count = V_tcbinfo.ipi_count +
- counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
- xig.xig_gen = V_tcbinfo.ipi_gencnt;
- xig.xig_sogen = so_gencnt;
- error = SYSCTL_OUT(req, &xig, sizeof xig);
- if (error)
- return (error);
- error = syncache_pcblist(req);
- if (error)
- return (error);
- NET_EPOCH_ENTER(et);
- for (inp = CK_LIST_FIRST(V_tcbinfo.ipi_listhead);
- inp != NULL;
- inp = CK_LIST_NEXT(inp, inp_list)) {
- INP_RLOCK(inp);
- if (inp->inp_gencnt <= xig.xig_gen) {
- int crerr;
- /*
- * XXX: This use of cr_cansee(), introduced with
- * TCP state changes, is not quite right, but for
- * now, better than nothing.
- */
- if (inp->inp_flags & INP_TIMEWAIT) {
- if (intotw(inp) != NULL)
- crerr = cr_cansee(req->td->td_ucred,
- intotw(inp)->tw_cred);
- else
- crerr = EINVAL; /* Skip this inp. */
- } else
- crerr = cr_canseeinpcb(req->td->td_ucred, inp);
- if (crerr == 0) {
- struct xtcpcb xt;
- tcp_inptoxtp(inp, &xt);
- INP_RUNLOCK(inp);
- error = SYSCTL_OUT(req, &xt, sizeof xt);
- if (error)
- break;
- else
- continue;
- }
- }
- INP_RUNLOCK(inp);
- }
- NET_EPOCH_EXIT(et);
- if (!error) {
- /*
- * Give the user an updated idea of our state.
- * If the generation differs from what we told
- * her before, she knows that something happened
- * while we were processing this request, and it
- * might be necessary to retry.
- */
- xig.xig_gen = V_tcbinfo.ipi_gencnt;
- xig.xig_sogen = so_gencnt;
- xig.xig_count = V_tcbinfo.ipi_count +
- counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
- error = SYSCTL_OUT(req, &xig, sizeof xig);
- }
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist,
- CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
- NULL, 0, tcp_pcblist, "S,xtcpcb",
- "List of active TCP connections");
- #ifdef INET
- static int
- tcp_getcred(SYSCTL_HANDLER_ARGS)
- {
- struct xucred xuc;
- struct sockaddr_in addrs[2];
- struct epoch_tracker et;
- struct inpcb *inp;
- int error;
- error = priv_check(req->td, PRIV_NETINET_GETCRED);
- if (error)
- return (error);
- error = SYSCTL_IN(req, addrs, sizeof(addrs));
- if (error)
- return (error);
- NET_EPOCH_ENTER(et);
- inp = in_pcblookup(&V_tcbinfo, addrs[1].sin_addr, addrs[1].sin_port,
- addrs[0].sin_addr, addrs[0].sin_port, INPLOOKUP_RLOCKPCB, NULL);
- NET_EPOCH_EXIT(et);
- if (inp != NULL) {
- if (inp->inp_socket == NULL)
- error = ENOENT;
- if (error == 0)
- error = cr_canseeinpcb(req->td->td_ucred, inp);
- if (error == 0)
- cru2x(inp->inp_cred, &xuc);
- INP_RUNLOCK(inp);
- } else
- error = ENOENT;
- if (error == 0)
- error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred,
- CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
- 0, 0, tcp_getcred, "S,xucred",
- "Get the xucred of a TCP connection");
- #endif /* INET */
- #ifdef INET6
- static int
- tcp6_getcred(SYSCTL_HANDLER_ARGS)
- {
- struct epoch_tracker et;
- struct xucred xuc;
- struct sockaddr_in6 addrs[2];
- struct inpcb *inp;
- int error;
- #ifdef INET
- int mapped = 0;
- #endif
- error = priv_check(req->td, PRIV_NETINET_GETCRED);
- if (error)
- return (error);
- error = SYSCTL_IN(req, addrs, sizeof(addrs));
- if (error)
- return (error);
- if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
- (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
- return (error);
- }
- if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) {
- #ifdef INET
- if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr))
- mapped = 1;
- else
- #endif
- return (EINVAL);
- }
- NET_EPOCH_ENTER(et);
- #ifdef INET
- if (mapped == 1)
- inp = in_pcblookup(&V_tcbinfo,
- *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12],
- addrs[1].sin6_port,
- *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12],
- addrs[0].sin6_port, INPLOOKUP_RLOCKPCB, NULL);
- else
- #endif
- inp = in6_pcblookup(&V_tcbinfo,
- &addrs[1].sin6_addr, addrs[1].sin6_port,
- &addrs[0].sin6_addr, addrs[0].sin6_port,
- INPLOOKUP_RLOCKPCB, NULL);
- NET_EPOCH_EXIT(et);
- if (inp != NULL) {
- if (inp->inp_socket == NULL)
- error = ENOENT;
- if (error == 0)
- error = cr_canseeinpcb(req->td->td_ucred, inp);
- if (error == 0)
- cru2x(inp->inp_cred, &xuc);
- INP_RUNLOCK(inp);
- } else
- error = ENOENT;
- if (error == 0)
- error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
- return (error);
- }
- SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred,
- CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
- 0, 0, tcp6_getcred, "S,xucred",
- "Get the xucred of a TCP6 connection");
- #endif /* INET6 */
- #ifdef INET
- void
- tcp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
- {
- struct ip *ip = vip;
- struct tcphdr *th;
- struct in_addr faddr;
- struct inpcb *inp;
- struct tcpcb *tp;
- struct inpcb *(*notify)(struct inpcb *, int) = tcp_notify;
- struct icmp *icp;
- struct in_conninfo inc;
- tcp_seq icmp_tcp_seq;
- int mtu;
- faddr = ((struct sockaddr_in *)sa)->sin_addr;
- if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
- return;
- if (cmd == PRC_MSGSIZE)
- notify = tcp_mtudisc_notify;
- else if (V_icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
- cmd == PRC_UNREACH_PORT || cmd == PRC_UNREACH_PROTOCOL ||
- cmd == PRC_TIMXCEED_INTRANS) && ip)
- notify = tcp_drop_syn_sent;
- /*
- * Hostdead is ugly because it goes linearly through all PCBs.
- * XXX: We never get this from ICMP, otherwise it makes an
- * excellent DoS attack on machines with many connections.
- */
- else if (cmd == PRC_HOSTDEAD)
- ip = NULL;
- else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
- return;
- if (ip == NULL) {
- in_pcbnotifyall(&V_tcbinfo, faddr, inetctlerrmap[cmd], notify);
- return;
- }
- icp = (struct icmp *)((caddr_t)ip - offsetof(struct icmp, icmp_ip));
- th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2));
- inp = in_pcblookup(&V_tcbinfo, faddr, th->th_dport, ip->ip_src,
- th->th_sport, INPLOOKUP_WLOCKPCB, NULL);
- if (inp != NULL && PRC_IS_REDIRECT(cmd)) {
- /* signal EHOSTDOWN, as it flushes the cached route */
- inp = (*notify)(inp, EHOSTDOWN);
- goto out;
- }
- icmp_tcp_seq = th->th_seq;
- if (inp != NULL) {
- if (!(inp->inp_flags & INP_TIMEWAIT) &&
- !(inp->inp_flags & INP_DROPPED) &&
- !(inp->inp_socket == NULL)) {
- tp = intotcpcb(inp);
- if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
- SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
- if (cmd == PRC_MSGSIZE) {
- /*
- * MTU discovery:
- * If we got a needfrag set the MTU
- * in the route to the suggested new
- * value (if given) and then notify.
- */
- mtu = ntohs(icp->icmp_nextmtu);
- /*
- * If no alternative MTU was
- * proposed, try the next smaller
- * one.
- */
- if (!mtu)
- mtu = ip_next_mtu(
- ntohs(ip->ip_len), 1);
- if (mtu < V_tcp_minmss +
- sizeof(struct tcpiphdr))
- mtu = V_tcp_minmss +
- sizeof(struct tcpiphdr);
- /*
- * Only process the offered MTU if it
- * is smaller than the current one.
- */
- if (mtu < tp->t_maxseg +
- sizeof(struct tcpiphdr)) {
- bzero(&inc, sizeof(inc));
- inc.inc_faddr = faddr;
- inc.inc_fibnum =
- inp->inp_inc.inc_fibnum;
- tcp_hc_updatemtu(&inc, mtu);
- tcp_mtudisc(inp, mtu);
- }
- } else
- inp = (*notify)(inp,
- inetctlerrmap[cmd]);
- }
- }
- } else {
- bzero(&inc, sizeof(inc));
- inc.inc_fport = th->th_dport;
- inc.inc_lport = th->th_sport;
- inc.inc_faddr = faddr;
- inc.inc_laddr = ip->ip_src;
- syncache_unreach(&inc, icmp_tcp_seq);
- }
- out:
- if (inp != NULL)
- INP_WUNLOCK(inp);
- }
- #endif /* INET */
- #ifdef INET6
- void
- tcp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
- {
- struct in6_addr *dst;
- struct inpcb *(*notify)(struct inpcb *, int) = tcp_notify;
- struct ip6_hdr *ip6;
- struct mbuf *m;
- struct inpcb *inp;
- struct tcpcb *tp;
- struct icmp6_hdr *icmp6;
- struct ip6ctlparam *ip6cp = NULL;
- const struct sockaddr_in6 *sa6_src = NULL;
- struct in_conninfo inc;
- struct tcp_ports {
- uint16_t th_sport;
- uint16_t th_dport;
- } t_ports;
- tcp_seq icmp_tcp_seq;
- unsigned int mtu;
- unsigned int off;
- if (sa->sa_family != AF_INET6 ||
- sa->sa_len != sizeof(struct sockaddr_in6))
- return;
- /* if the parameter is from icmp6, decode it. */
- if (d != NULL) {
- ip6cp = (struct ip6ctlparam *)d;
- icmp6 = ip6cp->ip6c_icmp6;
- m = ip6cp->ip6c_m;
- ip6 = ip6cp->ip6c_ip6;
- off = ip6cp->ip6c_off;
- sa6_src = ip6cp->ip6c_src;
- dst = ip6cp->ip6c_finaldst;
- } else {
- m = NULL;
- ip6 = NULL;
- off = 0; /* fool gcc */
- sa6_src = &sa6_any;
- dst = NULL;
- }
- if (cmd == PRC_MSGSIZE)
- notify = tcp_mtudisc_notify;
- else if (V_icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
- cmd == PRC_UNREACH_PORT || cmd == PRC_UNREACH_PROTOCOL ||
- cmd == PRC_TIMXCEED_INTRANS) && ip6 != NULL)
- notify = tcp_drop_syn_sent;
- /*
- * Hostdead is ugly because it goes linearly through all PCBs.
- * XXX: We never get this from ICMP, otherwise it makes an
- * excellent DoS attack on machines with many connections.
- */
- else if (cmd == PRC_HOSTDEAD)
- ip6 = NULL;
- else if ((unsigned)cmd >= PRC_NCMDS || inet6ctlerrmap[cmd] == 0)
- return;
- if (ip6 == NULL) {
- in6_pcbnotify(&V_tcbinfo, sa, 0,
- (const struct sockaddr *)sa6_src,
- 0, cmd, NULL, notify);
- return;
- }
- /* Check if we can safely get the ports from the tcp hdr */
- if (m == NULL ||
- (m->m_pkthdr.len <
- (int32_t) (off + sizeof(struct tcp_ports)))) {
- return;
- }
- bzero(&t_ports, sizeof(struct tcp_ports));
- m_copydata(m, off, sizeof(struct tcp_ports), (caddr_t)&t_ports);
- inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_dst, t_ports.th_dport,
- &ip6->ip6_src, t_ports.th_sport, INPLOOKUP_WLOCKPCB, NULL);
- if (inp != NULL && PRC_IS_REDIRECT(cmd)) {
- /* signal EHOSTDOWN, as it flushes the cached route */
- inp = (*notify)(inp, EHOSTDOWN);
- goto out;
- }
- off += sizeof(struct tcp_ports);
- if (m->m_pkthdr.len < (int32_t) (off + sizeof(tcp_seq))) {
- goto out;
- }
- m_copydata(m, off, sizeof(tcp_seq), (caddr_t)&icmp_tcp_seq);
- if (inp != NULL) {
- if (!(inp->inp_flags & INP_TIMEWAIT) &&
- !(inp->inp_flags & INP_DROPPED) &&
- !(inp->inp_socket == NULL)) {
- tp = intotcpcb(inp);
- if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
- SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
- if (cmd == PRC_MSGSIZE) {
- /*
- * MTU discovery:
- * If we got a needfrag set the MTU
- * in the route to the suggested new
- * value (if given) and then notify.
- */
- mtu = ntohl(icmp6->icmp6_mtu);
- /*
- * If no alternative MTU was
- * proposed, or the proposed
- * MTU was too small, set to
- * the min.
- */
- if (mtu < IPV6_MMTU)
- mtu = IPV6_MMTU - 8;
- bzero(&inc, sizeof(inc));
- inc.inc_fibnum = M_GETFIB(m);
- inc.inc_flags |= INC_ISIPV6;
- inc.inc6_faddr = *dst;
- if (in6_setscope(&inc.inc6_faddr,
- m->m_pkthdr.rcvif, NULL))
- goto out;
- /*
- * Only process the offered MTU if it
- * is smaller than the current one.
- */
- if (mtu < tp->t_maxseg +
- sizeof (struct tcphdr) +
- sizeof (struct ip6_hdr)) {
- tcp_hc_updatemtu(&inc, mtu);
- tcp_mtudisc(inp, mtu);
- ICMP6STAT_INC(icp6s_pmtuchg);
- }
- } else
- inp = (*notify)(inp,
- inet6ctlerrmap[cmd]);
- }
- }
- } else {
- bzero(&inc, sizeof(inc));
- inc.inc_fibnum = M_GETFIB(m);
- inc.inc_flags |= INC_ISIPV6;
- inc.inc_fport = t_ports.th_dport;
- inc.inc_lport = t_ports.th_sport;
- inc.inc6_faddr = *dst;
- inc.inc6_laddr = ip6->ip6_src;
- syncache_unreach(&inc, icmp_tcp_seq);
- }
- out:
- if (inp != NULL)
- INP_WUNLOCK(inp);
- }
- #endif /* INET6 */
- static uint32_t
- tcp_keyed_hash(struct in_conninfo *inc, u_char *key, u_int len)
- {
- SIPHASH_CTX ctx;
- uint32_t hash[2];
- KASSERT(len >= SIPHASH_KEY_LENGTH,
- ("%s: keylen %u too short ", __func__, len));
- SipHash24_Init(&ctx);
- SipHash_SetKey(&ctx, (uint8_t *)key);
- SipHash_Update(&ctx, &inc->inc_fport, sizeof(uint16_t));
- SipHash_Update(&ctx, &inc->inc_lport, sizeof(uint16_t));
- switch (inc->inc_flags & INC_ISIPV6) {
- #ifdef INET
- case 0:
- SipHash_Update(&ctx, &inc->inc_faddr, sizeof(struct in_addr));
- SipHash_Update(&ctx, &inc->inc_laddr, sizeof(struct in_addr));
- break;
- #endif
- #ifdef INET6
- case INC_ISIPV6:
- SipHash_Update(&ctx, &inc->inc6_faddr, sizeof(struct in6_addr));
- SipHash_Update(&ctx, &inc->inc6_laddr, sizeof(struct in6_addr));
- break;
- #endif
- }
- SipHash_Final((uint8_t *)hash, &ctx);
- return (hash[0] ^ hash[1]);
- }
- uint32_t
- tcp_new_ts_offset(struct in_conninfo *inc)
- {
- struct in_conninfo inc_store, *local_inc;
- if (!V_tcp_ts_offset_per_conn) {
- memcpy(&inc_store, inc, sizeof(struct in_conninfo));
- inc_store.inc_lport = 0;
- inc_store.inc_fport = 0;
- local_inc = &inc_store;
- } else {
- local_inc = inc;
- }
- return (tcp_keyed_hash(local_inc, V_ts_offset_secret,
- sizeof(V_ts_offset_secret)));
- }
- /*
- * Following is where TCP initial sequence number generation occurs.
- *
- * There are two places where we must use initial sequence numbers:
- * 1. In SYN-ACK packets.
- * 2. In SYN packets.
- *
- * All ISNs for SYN-ACK packets are generated by the syncache. See
- * tcp_syncache.c for details.
- *
- * The ISNs in SYN packets must be monotonic; TIME_WAIT recycling
- * depends on this property. In addition, these ISNs should be
- * unguessable so as to prevent connection hijacking. To satisfy
- * the requirements of this situation, the algorithm outlined in
- * RFC 1948 is used, with only small modifications.
- *
- * Implementation details:
- *
- * Time is based off the system timer, and is corrected so that it
- * increases by one megabyte per second. This allows for proper
- * recycling on high speed LANs while still leaving over an hour
- * before rollover.
- *
- * As reading the *exact* system time is too expensive to be done
- * whenever setting up a TCP connection, we increment the time
- * offset in two ways. First, a small random positive increment
- * is added to isn_offset for each connection that is set up.
- * Second, the function tcp_isn_tick fires once per clock tick
- * and increments isn_offset as necessary so that sequence numbers
- * are incremented at approximately ISN_BYTES_PER_SECOND. The
- * random positive increments serve only to ensure that the same
- * exact sequence number is never sent out twice (as could otherwise
- * happen when a port is recycled in less than the system tick
- * interval.)
- *
- * net.inet.tcp.isn_reseed_interval controls the number of seconds
- * between seeding of isn_secret. This is normally set to zero,
- * as reseeding should not be necessary.
- *
- * Locking of the global variables isn_secret, isn_last_reseed, isn_offset,
- * isn_offset_old, and isn_ctx is performed using the ISN lock. In
- * general, this means holding an exclusive (write) lock.
- */
- #define ISN_BYTES_PER_SECOND 1048576
- #define ISN_STATIC_INCREMENT 4096
- #define ISN_RANDOM_INCREMENT (4096 - 1)
- #define ISN_SECRET_LENGTH SIPHASH_KEY_LENGTH
- VNET_DEFINE_STATIC(u_char, isn_secret[ISN_SECRET_LENGTH]);
- VNET_DEFINE_STATIC(int, isn_last);
- VNET_DEFINE_STATIC(int, isn_last_reseed);
- VNET_DEFINE_STATIC(u_int32_t, isn_offset);
- VNET_DEFINE_STATIC(u_int32_t, isn_offset_old);
- #define V_isn_secret VNET(isn_secret)
- #define V_isn_last VNET(isn_last)
- #define V_isn_last_reseed VNET(isn_last_reseed)
- #define V_isn_offset VNET(isn_offset)
- #define V_isn_offset_old VNET(isn_offset_old)
- tcp_seq
- tcp_new_isn(struct in_conninfo *inc)
- {
- tcp_seq new_isn;
- u_int32_t projected_offset;
- ISN_LOCK();
- /* Seed if this is the first use, reseed if requested. */
- if ((V_isn_last_reseed == 0) || ((V_tcp_isn_reseed_interval > 0) &&
- (((u_int)V_isn_last_reseed + (u_int)V_tcp_isn_reseed_interval*hz)
- < (u_int)ticks))) {
- arc4rand(&V_isn_secret, sizeof(V_isn_secret), 0);
- V_isn_last_reseed = ticks;
- }
- /* Compute the hash and return the ISN. */
- new_isn = (tcp_seq)tcp_keyed_hash(inc, V_isn_secret,
- sizeof(V_isn_secret));
- V_isn_offset += ISN_STATIC_INCREMENT +
- (arc4random() & ISN_RANDOM_INCREMENT);
- if (ticks != V_isn_last) {
- projected_offset = V_isn_offset_old +
- ISN_BYTES_PER_SECOND / hz * (ticks - V_isn_last);
- if (SEQ_GT(projected_offset, V_isn_offset))
- V_isn_offset = projected_offset;
- V_isn_offset_old = V_isn_offset;
- V_isn_last = ticks;
- }
- new_isn += V_isn_offset;
- ISN_UNLOCK();
- return (new_isn);
- }
- /*
- * When a specific ICMP unreachable message is received and the
- * connection state is SYN-SENT, drop the connection. This behavior
- * is controlled by the icmp_may_rst sysctl.
- */
- struct inpcb *
- tcp_drop_syn_sent(struct inpcb *inp, int errno)
- {
- struct tcpcb *tp;
- NET_EPOCH_ASSERT();
- INP_WLOCK_ASSERT(inp);
- if ((inp->inp_flags & INP_TIMEWAIT) ||
- (inp->inp_flags & INP_DROPPED))
- return (inp);
- tp = intotcpcb(inp);
- if (tp->t_state != TCPS_SYN_SENT)
- return (inp);
- if (IS_FASTOPEN(tp->t_flags))
- tcp_fastopen_disable_path(tp);
- tp = tcp_drop(tp, errno);
- if (tp != NULL)
- return (inp);
- else
- return (NULL);
- }
- /*
- * When `need fragmentation' ICMP is received, update our idea of the MSS
- * based on the new value. Also nudge TCP to send something, since we
- * know the packet we just sent was dropped.
- * This duplicates some code in the tcp_mss() function in tcp_input.c.
- */
- static struct inpcb *
- tcp_mtudisc_notify(struct inpcb *inp, int error)
- {
- tcp_mtudisc(inp, -1);
- return (inp);
- }
- static void
- tcp_mtudisc(struct inpcb *inp, int mtuoffer)
- {
- struct tcpcb *tp;
- struct socket *so;
- INP_WLOCK_ASSERT(inp);
- if ((inp->inp_flags & INP_TIMEWAIT) ||
- (inp->inp_flags & INP_DROPPED))
- return;
- tp = intotcpcb(inp);
- KASSERT(tp != NULL, ("tcp_mtudisc: tp == NULL"));
- tcp_mss_update(tp, -1, mtuoffer, NULL, NULL);
- so = inp->inp_socket;
- SOCKBUF_LOCK(&so->so_snd);
- /* If the mss is larger than the socket buffer, decrease the mss. */
- if (so->so_snd.sb_hiwat < tp->t_maxseg)
- tp->t_maxseg = so->so_snd.sb_hiwat;
- SOCKBUF_UNLOCK(&so->so_snd);
- TCPSTAT_INC(tcps_mturesent);
- tp->t_rtttime = 0;
- tp->snd_nxt = tp->snd_una;
- tcp_free_sackholes(tp);
- tp->snd_recover = tp->snd_max;
- if (tp->t_flags & TF_SACK_PERMIT)
- EXIT_FASTRECOVERY(tp->t_flags);
- tp->t_fb->tfb_tcp_output(tp);
- }
- #ifdef INET
- /*
- * Look-up the routing entry to the peer of this inpcb. If no route
- * is found and it cannot be allocated, then return 0. This routine
- * is called by TCP routines that access the rmx structure and by
- * tcp_mss_update to get the peer/interface MTU.
- */
- uint32_t
- tcp_maxmtu(struct in_conninfo *inc, struct tcp_ifcap *cap)
- {
- struct nhop_object *nh;
- struct ifnet *ifp;
- uint32_t maxmtu = 0;
- KASSERT(inc != NULL, ("tcp_maxmtu with NULL in_conninfo pointer"));
- if (inc->inc_faddr.s_addr != INADDR_ANY) {
- nh = fib4_lookup(inc->inc_fibnum, inc->inc_faddr, 0, NHR_NONE, 0);
- if (nh == NULL)
- return (0);
- ifp = nh->nh_ifp;
- maxmtu = nh->nh_mtu;
- /* Report additional interface capabilities. */
- if (cap != NULL) {
- if (ifp->if_capenable & IFCAP_TSO4 &&
- ifp->if_hwassist & CSUM_TSO) {
- cap->ifcap |= CSUM_TSO;
- cap->tsomax = ifp->if_hw_tsomax;
- cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
- cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
- }
- }
- }
- return (maxmtu);
- }
- #endif /* INET */
- #ifdef INET6
- uint32_t
- tcp_maxmtu6(struct in_conninfo *inc, struct tcp_ifcap *cap)
- {
- struct nhop_object *nh;
- struct in6_addr dst6;
- uint32_t scopeid;
- struct ifnet *ifp;
- uint32_t maxmtu = 0;
- KASSERT(inc != NULL, ("tcp_maxmtu6 with NULL in_conninfo pointer"));
- if (inc->inc_flags & INC_IPV6MINMTU)
- return (IPV6_MMTU);
- if (!IN6_IS_ADDR_UNSPECIFIED(&inc->inc6_faddr)) {
- in6_splitscope(&inc->inc6_faddr, &dst6, &scopeid);
- nh = fib6_lookup(inc->inc_fibnum, &dst6, scopeid, NHR_NONE, 0);
- if (nh == NULL)
- return (0);
- ifp = nh->nh_ifp;
- maxmtu = nh->nh_mtu;
- /* Report additional interface capabilities. */
- if (cap != NULL) {
- if (ifp->if_capenable & IFCAP_TSO6 &&
- ifp->if_hwassist & CSUM_TSO) {
- cap->ifcap |= CSUM_TSO;
- cap->tsomax = ifp->if_hw_tsomax;
- cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
- cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
- }
- }
- }
- return (maxmtu);
- }
- #endif /* INET6 */
- /*
- * Calculate effective SMSS per RFC5681 definition for a given TCP
- * connection at its current state, taking into account SACK and etc.
- */
- u_int
- tcp_maxseg(const struct tcpcb *tp)
- {
- u_int optlen;
- if (tp->t_flags & TF_NOOPT)
- return (tp->t_maxseg);
- /*
- * Here we have a simplified code from tcp_addoptions(),
- * without a proper loop, and having most of paddings hardcoded.
- * We might make mistakes with padding here in some edge cases,
- * but this is harmless, since result of tcp_maxseg() is used
- * only in cwnd and ssthresh estimations.
- */
- if (TCPS_HAVEESTABLISHED(tp->t_state)) {
- if (tp->t_flags & TF_RCVD_TSTMP)
- optlen = TCPOLEN_TSTAMP_APPA;
- else
- optlen = 0;
- #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
- if (tp->t_flags & TF_SIGNATURE)
- optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
- #endif
- if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) {
- optlen += TCPOLEN_SACKHDR;
- optlen += tp->rcv_numsacks * TCPOLEN_SACK;
- optlen = PADTCPOLEN(optlen);
- }
- } else {
- if (tp->t_flags & TF_REQ_TSTMP)
- optlen = TCPOLEN_TSTAMP_APPA;
- else
- optlen = PADTCPOLEN(TCPOLEN_MAXSEG);
- if (tp->t_flags & TF_REQ_SCALE)
- optlen += PADTCPOLEN(TCPOLEN_WINDOW);
- #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
- if (tp->t_flags & TF_SIGNATURE)
- optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
- #endif
- if (tp->t_flags & TF_SACK_PERMIT)
- optlen += PADTCPOLEN(TCPOLEN_SACK_PERMITTED);
- }
- #undef PAD
- optlen = min(optlen, TCP_MAXOLEN);
- return (tp->t_maxseg - optlen);
- }
- static int
- sysctl_drop(SYSCTL_HANDLER_ARGS)
- {
- /* addrs[0] is a foreign socket, addrs[1] is a local one. */
- struct sockaddr_storage addrs[2];
- struct inpcb *inp;
- struct tcpcb *tp;
- struct tcptw *tw;
- struct sockaddr_in *fin, *lin;
- struct epoch_tracker et;
- #ifdef INET6
- struct sockaddr_in6 *fin6, *lin6;
- #endif
- int error;
- inp = NULL;
- fin = lin = NULL;
- #ifdef INET6
- fin6 = lin6 = NULL;
- #endif
- error = 0;
- if (req->oldptr != NULL || req->oldlen != 0)
- return (EINVAL);
- if (req->newptr == NULL)
- return (EPERM);
- if (req->newlen < sizeof(addrs))
- return (ENOMEM);
- error = SYSCTL_IN(req, &addrs, sizeof(addrs));
- if (error)
- return (error);
- switch (addrs[0].ss_family) {
- #ifdef INET6
- case AF_INET6:
- fin6 = (struct sockaddr_in6 *)&addrs[0];
- lin6 = (struct sockaddr_in6 *)&addrs[1];
- if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
- lin6->sin6_len != sizeof(struct sockaddr_in6))
- return (EINVAL);
- if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
- if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
- return (EINVAL);
- in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
- in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
- fin = (struct sockaddr_in *)&addrs[0];
- lin = (struct sockaddr_in *)&addrs[1];
- break;
- }
- error = sa6_embedscope(fin6, V_ip6_use_defzone);
- if (error)
- return (error);
- error = sa6_embedscope(lin6, V_ip6_use_defzone);
- if (error)
- return (error);
- break;
- #endif
- #ifdef INET
- case AF_INET:
- fin = (struct sockaddr_in *)&addrs[0];
- lin = (struct sockaddr_in *)&addrs[1];
- if (fin->sin_len != sizeof(struct sockaddr_in) ||
- lin->sin_len != sizeof(struct sockaddr_in))
- return (EINVAL);
- break;
- #endif
- default:
- return (EINVAL);
- }
- NET_EPOCH_ENTER(et);
- switch (addrs[0].ss_family) {
- #ifdef INET6
- case AF_INET6:
- inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
- fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
- INPLOOKUP_WLOCKPCB, NULL);
- break;
- #endif
- #ifdef INET
- case AF_INET:
- inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
- lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
- break;
- #endif
- }
- if (inp != NULL) {
- if (inp->inp_flags & INP_TIMEWAIT) {
- /*
- * XXXRW: There currently exists a state where an
- * inpcb is present, but its timewait state has been
- * discarded. For now, don't allow dropping of this
- * type of inpcb.
- */
- tw = intotw(inp);
- if (tw != NULL)
- tcp_twclose(tw, 0);
- else
- INP_WUNLOCK(inp);
- } else if (!(inp->inp_flags & INP_DROPPED) &&
- !(inp->inp_socket->so_options & SO_ACCEPTCONN)) {
- tp = intotcpcb(inp);
- tp = tcp_drop(tp, ECONNABORTED);
- if (tp != NULL)
- INP_WUNLOCK(inp);
- } else
- INP_WUNLOCK(inp);
- } else
- error = ESRCH;
- NET_EPOCH_EXIT(et);
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, TCPCTL_DROP, drop,
- CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
- CTLFLAG_NEEDGIANT, NULL, 0, sysctl_drop, "",
- "Drop TCP connection");
- #ifdef KERN_TLS
- static int
- sysctl_switch_tls(SYSCTL_HANDLER_ARGS)
- {
- /* addrs[0] is a foreign socket, addrs[1] is a local one. */
- struct sockaddr_storage addrs[2];
- struct inpcb *inp;
- struct sockaddr_in *fin, *lin;
- struct epoch_tracker et;
- #ifdef INET6
- struct sockaddr_in6 *fin6, *lin6;
- #endif
- int error;
- inp = NULL;
- fin = lin = NULL;
- #ifdef INET6
- fin6 = lin6 = NULL;
- #endif
- error = 0;
- if (req->oldptr != NULL || req->oldlen != 0)
- return (EINVAL);
- if (req->newptr == NULL)
- return (EPERM);
- if (req->newlen < sizeof(addrs))
- return (ENOMEM);
- error = SYSCTL_IN(req, &addrs, sizeof(addrs));
- if (error)
- return (error);
- switch (addrs[0].ss_family) {
- #ifdef INET6
- case AF_INET6:
- fin6 = (struct sockaddr_in6 *)&addrs[0];
- lin6 = (struct sockaddr_in6 *)&addrs[1];
- if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
- lin6->sin6_len != sizeof(struct sockaddr_in6))
- return (EINVAL);
- if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
- if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
- return (EINVAL);
- in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
- in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
- fin = (struct sockaddr_in *)&addrs[0];
- lin = (struct sockaddr_in *)&addrs[1];
- break;
- }
- error = sa6_embedscope(fin6, V_ip6_use_defzone);
- if (error)
- return (error);
- error = sa6_embedscope(lin6, V_ip6_use_defzone);
- if (error)
- return (error);
- break;
- #endif
- #ifdef INET
- case AF_INET:
- fin = (struct sockaddr_in *)&addrs[0];
- lin = (struct sockaddr_in *)&addrs[1];
- if (fin->sin_len != sizeof(struct sockaddr_in) ||
- lin->sin_len != sizeof(struct sockaddr_in))
- return (EINVAL);
- break;
- #endif
- default:
- return (EINVAL);
- }
- NET_EPOCH_ENTER(et);
- switch (addrs[0].ss_family) {
- #ifdef INET6
- case AF_INET6:
- inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
- fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
- INPLOOKUP_WLOCKPCB, NULL);
- break;
- #endif
- #ifdef INET
- case AF_INET:
- inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
- lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
- break;
- #endif
- }
- NET_EPOCH_EXIT(et);
- if (inp != NULL) {
- if ((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) != 0 ||
- inp->inp_socket == NULL) {
- error = ECONNRESET;
- INP_WUNLOCK(inp);
- } else {
- struct socket *so;
- so = inp->inp_socket;
- soref(so);
- error = ktls_set_tx_mode(so,
- arg2 == 0 ? TCP_TLS_MODE_SW : TCP_TLS_MODE_IFNET);
- INP_WUNLOCK(inp);
- SOCK_LOCK(so);
- sorele(so);
- }
- } else
- error = ESRCH;
- return (error);
- }
- SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_sw_tls,
- CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
- CTLFLAG_NEEDGIANT, NULL, 0, sysctl_switch_tls, "",
- "Switch TCP connection to SW TLS");
- SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_ifnet_tls,
- CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
- CTLFLAG_NEEDGIANT, NULL, 1, sysctl_switch_tls, "",
- "Switch TCP connection to ifnet TLS");
- #endif
- /*
- * Generate a standardized TCP log line for use throughout the
- * tcp subsystem. Memory allocation is done with M_NOWAIT to
- * allow use in the interrupt context.
- *
- * NB: The caller MUST free(s, M_TCPLOG) the returned string.
- * NB: The function may return NULL if memory allocation failed.
- *
- * Due to header inclusion and ordering limitations the struct ip
- * and ip6_hdr pointers have to be passed as void pointers.
- */
- char *
- tcp_log_vain(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
- const void *ip6hdr)
- {
- /* Is logging enabled? */
- if (V_tcp_log_in_vain == 0)
- return (NULL);
- return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
- }
- char *
- tcp_log_addrs(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
- const void *ip6hdr)
- {
- /* Is logging enabled? */
- if (tcp_log_debug == 0)
- return (NULL);
- return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
- }
- static char *
- tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
- const void *ip6hdr)
- {
- char *s, *sp;
- size_t size;
- struct ip *ip;
- #ifdef INET6
- const struct ip6_hdr *ip6;
- ip6 = (const struct ip6_hdr *)ip6hdr;
- #endif /* INET6 */
- ip = (struct ip *)ip4hdr;
- /*
- * The log line looks like this:
- * "TCP: [1.2.3.4]:50332 to [1.2.3.4]:80 tcpflags 0x2<SYN>"
- */
- size = sizeof("TCP: []:12345 to []:12345 tcpflags 0x2<>") +
- sizeof(PRINT_TH_FLAGS) + 1 +
- #ifdef INET6
- 2 * INET6_ADDRSTRLEN;
- #else
- 2 * INET_ADDRSTRLEN;
- #endif /* INET6 */
- s = malloc(size, M_TCPLOG, M_ZERO|M_NOWAIT);
- if (s == NULL)
- return (NULL);
- strcat(s, "TCP: [");
- sp = s + strlen(s);
- if (inc && ((inc->inc_flags & INC_ISIPV6) == 0)) {
- inet_ntoa_r(inc->inc_faddr, sp);
- sp = s + strlen(s);
- sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
- sp = s + strlen(s);
- inet_ntoa_r(inc->inc_laddr, sp);
- sp = s + strlen(s);
- sprintf(sp, "]:%i", ntohs(inc->inc_lport));
- #ifdef INET6
- } else if (inc) {
- ip6_sprintf(sp, &inc->inc6_faddr);
- sp = s + strlen(s);
- sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
- sp = s + strlen(s);
- ip6_sprintf(sp, &inc->inc6_laddr);
- sp = s + strlen(s);
- sprintf(sp, "]:%i", ntohs(inc->inc_lport));
- } else if (ip6 && th) {
- ip6_sprintf(sp, &ip6->ip6_src);
- sp = s + strlen(s);
- sprintf(sp, "]:%i to [", ntohs(th->th_sport));
- sp = s + strlen(s);
- ip6_sprintf(sp, &ip6->ip6_dst);
- sp = s + strlen(s);
- sprintf(sp, "]:%i", ntohs(th->th_dport));
- #endif /* INET6 */
- #ifdef INET
- } else if (ip && th) {
- inet_ntoa_r(ip->ip_src, sp);
- sp = s + strlen(s);
- sprintf(sp, "]:%i to [", ntohs(th->th_sport));
- sp = s + strlen(s);
- inet_ntoa_r(ip->ip_dst, sp);
- sp = s + strlen(s);
- sprintf(sp, "]:%i", ntohs(th->th_dport));
- #endif /* INET */
- } else {
- free(s, M_TCPLOG);
- return (NULL);
- }
- sp = s + strlen(s);
- if (th)
- sprintf(sp, " tcpflags 0x%b", th->th_flags, PRINT_TH_FLAGS);
- if (*(s + size - 1) != '\0')
- panic("%s: string too long", __func__);
- return (s);
- }
- /*
- * A subroutine which makes it easy to track TCP state changes with DTrace.
- * This function shouldn't be called for t_state initializations that don't
- * correspond to actual TCP state transitions.
- */
- void
- tcp_state_change(struct tcpcb *tp, int newstate)
- {
- #if defined(KDTRACE_HOOKS)
- int pstate = tp->t_state;
- #endif
- TCPSTATES_DEC(tp->t_state);
- TCPSTATES_INC(newstate);
- tp->t_state = newstate;
- TCP_PROBE6(state__change, NULL, tp, NULL, tp, NULL, pstate);
- }
- /*
- * Create an external-format (``xtcpcb'') structure using the information in
- * the kernel-format tcpcb structure pointed to by tp. This is done to
- * reduce the spew of irrelevant information over this interface, to isolate
- * user code from changes in the kernel structure, and potentially to provide
- * information-hiding if we decide that some of this information should be
- * hidden from users.
- */
- void
- tcp_inptoxtp(const struct inpcb *inp, struct xtcpcb *xt)
- {
- struct tcpcb *tp = intotcpcb(inp);
- sbintime_t now;
- bzero(xt, sizeof(*xt));
- if (inp->inp_flags & INP_TIMEWAIT) {
- xt->t_state = TCPS_TIME_WAIT;
- } else {
- xt->t_state = tp->t_state;
- xt->t_logstate = tp->t_logstate;
- xt->t_flags = tp->t_flags;
- xt->t_sndzerowin = tp->t_sndzerowin;
- xt->t_sndrexmitpack = tp->t_sndrexmitpack;
- xt->t_rcvoopack = tp->t_rcvoopack;
- xt->t_rcv_wnd = tp->rcv_wnd;
- xt->t_snd_wnd = tp->snd_wnd;
- xt->t_snd_cwnd = tp->snd_cwnd;
- xt->t_snd_ssthresh = tp->snd_ssthresh;
- xt->t_maxseg = tp->t_maxseg;
- xt->xt_ecn = (tp->t_flags2 & TF2_ECN_PERMIT) ? 1 : 0 +
- (tp->t_flags2 & TF2_ACE_PERMIT) ? 2 : 0;
- now = getsbinuptime();
- #define COPYTIMER(ttt) do { \
- if (callout_active(&tp->t_timers->ttt)) \
- xt->ttt = (tp->t_timers->ttt.c_time - now) / \
- SBT_1MS; \
- else \
- xt->ttt = 0; \
- } while (0)
- COPYTIMER(tt_delack);
- COPYTIMER(tt_rexmt);
- COPYTIMER(tt_persist);
- COPYTIMER(tt_keep);
- COPYTIMER(tt_2msl);
- #undef COPYTIMER
- xt->t_rcvtime = 1000 * (ticks - tp->t_rcvtime) / hz;
- bcopy(tp->t_fb->tfb_tcp_block_name, xt->xt_stack,
- TCP_FUNCTION_NAME_LEN_MAX);
- bcopy(CC_ALGO(tp)->name, xt->xt_cc,
- TCP_CA_NAME_MAX);
- #ifdef TCP_BLACKBOX
- (void)tcp_log_get_id(tp, xt->xt_logid);
- #endif
- }
- xt->xt_len = sizeof(struct xtcpcb);
- in_pcbtoxinpcb(inp, &xt->xt_inp);
- if (inp->inp_socket == NULL)
- xt->xt_inp.xi_socket.xso_protocol = IPPROTO_TCP;
- }
- void
- tcp_log_end_status(struct tcpcb *tp, uint8_t status)
- {
- uint32_t bit, i;
- if ((tp == NULL) ||
- (status > TCP_EI_STATUS_MAX_VALUE) ||
- (status == 0)) {
- /* Invalid */
- return;
- }
- if (status > (sizeof(uint32_t) * 8)) {
- /* Should this be a KASSERT? */
- return;
- }
- bit = 1U << (status - 1);
- if (bit & tp->t_end_info_status) {
- /* already logged */
- return;
- }
- for (i = 0; i < TCP_END_BYTE_INFO; i++) {
- if (tp->t_end_info_bytes[i] == TCP_EI_EMPTY_SLOT) {
- tp->t_end_info_bytes[i] = status;
- tp->t_end_info_status |= bit;
- break;
- }
- }
- }
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