2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $DragonFly: src/sys/netinet/ip_demux.c,v 1.45 2008/11/11 10:46:58 sephe Exp $
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/socket.h>
43 #include <sys/socketvar.h>
44 #include <sys/thread.h>
45 #include <sys/sysctl.h>
46 #include <sys/globaldata.h>
49 #include <net/netisr.h>
51 #include <net/toeplitz2.h>
54 #include <netinet/in_systm.h>
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet/in_pcb.h>
58 #include <netinet/ip.h>
59 #include <netinet/ip_var.h>
60 #include <netinet/tcp.h>
61 #include <netinet/tcpip.h>
62 #include <netinet/tcp_var.h>
63 #include <netinet/udp.h>
64 #include <netinet/udp_var.h>
66 extern struct thread netisr_cpu[];
67 extern int udp_mpsafe_thread;
69 static struct thread tcp_thread[MAXCPU];
70 static struct thread udp_thread[MAXCPU];
75 INP_MPORT_HASH(in_addr_t faddr, in_addr_t laddr,
76 in_port_t fport, in_port_t lport)
79 * Use low order bytes.
82 #if (BYTE_ORDER == LITTLE_ENDIAN)
83 KASSERT(ncpus2 < 256, ("need different hash function")); /* XXX JH */
84 return (((faddr >> 24) ^ (fport >> 8) ^ (laddr >> 24) ^ (lport >> 8)) &
87 return ((faddr ^ fport ^ laddr ^ lport) & ncpus2_mask);
94 INP_MPORT_HASH_UDP(in_addr_t faddr, in_addr_t laddr,
95 in_port_t fport, in_port_t lport)
98 return INP_MPORT_HASH(faddr, laddr, fport, lport);
100 return toeplitz_hash(toeplitz_rawhash_addr(faddr, laddr));
105 INP_MPORT_HASH_TCP(in_addr_t faddr, in_addr_t laddr,
106 in_port_t fport, in_port_t lport)
109 return INP_MPORT_HASH(faddr, laddr, fport, lport);
111 return toeplitz_hash(
112 toeplitz_rawhash_addrport(faddr, laddr, fport, lport));
117 * If the packet is a valid IP datagram, upon returning of this function
118 * following things are promised:
120 * o IP header (including any possible IP options) is in one mbuf (m_len).
121 * o IP header length is not less than the minimum (sizeof(struct ip)).
122 * o IP total length is not less than IP header length.
123 * o IP datagram resides completely in the mbuf chain,
124 * i.e. pkthdr.len >= IP total length.
126 * If the packet is a UDP datagram,
127 * o IP header (including any possible IP options) and UDP header are in
129 * o IP total length is not less than (IP header length + UDP header length).
131 * If the packet is a TCP segment,
132 * o IP header (including any possible IP options) and TCP header (including
133 * any possible TCP options) are in one mbuf (m_len).
134 * o TCP header length is not less than the minimum (sizeof(struct tcphdr)).
135 * o IP total length is not less than (IP header length + TCP header length).
138 ip_lengthcheck(struct mbuf **mp)
140 struct mbuf *m = *mp;
144 int thoff; /* TCP data offset */
146 /* The packet must be at least the size of an IP header. */
147 if (m->m_pkthdr.len < sizeof(struct ip)) {
148 ipstat.ips_tooshort++;
152 /* The fixed IP header must reside completely in the first mbuf. */
153 if (m->m_len < sizeof(struct ip)) {
154 m = m_pullup(m, sizeof(struct ip));
156 ipstat.ips_toosmall++;
161 ip = mtod(m, struct ip *);
163 /* Bound check the packet's stated IP header length. */
164 iphlen = ip->ip_hl << 2;
165 if (iphlen < sizeof(struct ip)) { /* minimum header length */
166 ipstat.ips_badhlen++;
170 /* The full IP header must reside completely in the one mbuf. */
171 if (m->m_len < iphlen) {
172 m = m_pullup(m, iphlen);
174 ipstat.ips_badhlen++;
177 ip = mtod(m, struct ip *);
180 iplen = ntohs(ip->ip_len);
183 * Check that the amount of data in the buffers is as
184 * at least much as the IP header would have us expect.
186 if (m->m_pkthdr.len < iplen) {
187 ipstat.ips_tooshort++;
192 * Fragments other than the first fragment don't have much
193 * length information.
195 if (ntohs(ip->ip_off) & IP_OFFMASK)
199 * The TCP/IP or UDP/IP header must be entirely contained within
200 * the first fragment of a packet. Packet filters will break if they
203 * Since the packet will be trimmed to ip_len we must also make sure
204 * the potentially trimmed down length is still sufficient to hold
209 if (iplen < iphlen + sizeof(struct tcphdr)) {
210 ++tcpstat.tcps_rcvshort;
213 if (m->m_len < iphlen + sizeof(struct tcphdr)) {
214 m = m_pullup(m, iphlen + sizeof(struct tcphdr));
216 tcpstat.tcps_rcvshort++;
219 ip = mtod(m, struct ip *);
221 th = (struct tcphdr *)((caddr_t)ip + iphlen);
222 thoff = th->th_off << 2;
223 if (thoff < sizeof(struct tcphdr) ||
224 thoff + iphlen > ntohs(ip->ip_len)) {
225 tcpstat.tcps_rcvbadoff++;
228 if (m->m_len < iphlen + thoff) {
229 m = m_pullup(m, iphlen + thoff);
231 tcpstat.tcps_rcvshort++;
237 if (iplen < iphlen + sizeof(struct udphdr)) {
238 ++udpstat.udps_hdrops;
241 if (m->m_len < iphlen + sizeof(struct udphdr)) {
242 m = m_pullup(m, iphlen + sizeof(struct udphdr));
244 udpstat.udps_hdrops++;
251 if (iplen < iphlen) {
258 m->m_flags |= M_LENCHECKED;
270 * Map a packet to a protocol processing thread and return the thread's port.
271 * If an error occurs, the passed mbuf will be freed, *mptr will be set
272 * to NULL, and NULL will be returned. If no error occurs, the passed mbuf
273 * may be modified and a port pointer will be returned.
276 ip_mport(struct mbuf **mptr, int dir)
283 int thoff; /* TCP data offset */
287 if (!ip_lengthcheck(mptr))
291 ip = mtod(m, struct ip *);
292 iphlen = ip->ip_hl << 2;
295 * XXX generic packet handling defrag on CPU 0 for now.
297 if (ntohs(ip->ip_off) & (IP_MF | IP_OFFMASK)) {
299 port = &netisr_cpu[cpu].td_msgport;
305 th = (struct tcphdr *)((caddr_t)ip + iphlen);
306 thoff = th->th_off << 2;
307 cpu = INP_MPORT_HASH_TCP(ip->ip_src.s_addr, ip->ip_dst.s_addr,
308 th->th_sport, th->th_dport);
309 port = &tcp_thread[cpu].td_msgport;
313 uh = (struct udphdr *)((caddr_t)ip + iphlen);
316 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
317 (dir == IP_MPORT_IN &&
318 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))) {
323 cpu = INP_MPORT_HASH_UDP(ip->ip_src.s_addr,
324 ip->ip_dst.s_addr, uh->uh_sport, uh->uh_dport);
326 port = &udp_thread[cpu].td_msgport;
331 port = &netisr_cpu[cpu].td_msgport;
335 m->m_flags |= M_HASH;
336 m->m_pkthdr.hash = cpu;
341 ip_mport_in(struct mbuf **mptr)
343 return ip_mport(mptr, IP_MPORT_IN);
347 * Map a packet to a protocol processing thread and return the thread's port.
348 * Unlike ip_mport(), the packet content is not accessed. The packet info
349 * (pi) and the hash of the packet (m_pkthdr.hash) is used instead. NULL is
350 * returned if the packet info does not contain enough information.
352 * Caller has already made sure that m_pkthdr.hash is valid, i.e. m_flags
356 ip_mport_pktinfo(const struct pktinfo *pi, struct mbuf *m)
360 KASSERT(m->m_pkthdr.hash < ncpus2,
361 ("invalid packet hash %#x\n", m->m_pkthdr.hash));
364 * XXX generic packet handling defrag on CPU 0 for now.
366 if (pi->pi_flags & PKTINFO_FLAG_FRAG) {
367 m->m_pkthdr.hash = 0;
368 return &netisr_cpu[0].td_msgport;
371 switch (pi->pi_l3proto) {
373 port = &tcp_thread[m->m_pkthdr.hash].td_msgport;
377 port = &udp_thread[m->m_pkthdr.hash].td_msgport;
388 * Map a TCP socket to a protocol processing thread.
391 tcp_soport(struct socket *so, struct sockaddr *nam __unused,
392 struct mbuf **dummy __unused, int req)
396 /* The following processing all take place on Protocol Thread 0. */
397 if (req == PRU_BIND || req == PRU_CONNECT || req == PRU_ATTACH ||
399 return (&tcp_thread[0].td_msgport);
402 if (!inp) /* connection reset by peer */
403 return (&tcp_thread[0].td_msgport);
406 * Already bound and connected or listening. For TCP connections,
407 * the (faddr, fport, laddr, lport) association cannot change now.
409 * Note: T/TCP code needs some reorganization to fit into
412 * Rely on type-stable memory and check in protocol handler
413 * to fix race condition here w/ deallocation of inp. XXX JH
415 return (&tcp_thread[INP_MPORT_HASH_TCP(inp->inp_faddr.s_addr,
416 inp->inp_laddr.s_addr, inp->inp_fport, inp->inp_lport)].td_msgport);
420 * Used to route icmp messages to the proper protocol thread for ctlinput
424 tcp_ctlport(int cmd, struct sockaddr *sa, void *vip)
428 struct in_addr faddr;
431 faddr = ((struct sockaddr_in *)sa)->sin_addr;
432 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
434 if (ip == NULL || PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
436 * Message will be forwarded to all TCP protocol threads
439 * netisr0 (the msgport we return here)
442 * | domsg <----------------------------+
446 * V forwardmsg forwardmsg |
447 * tcp0 ------------> tcp1 ------------> tcpN
449 return cpu0_ctlport(cmd, sa, vip);
451 th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2));
452 cpu = tcp_addrcpu(faddr.s_addr, th->th_dport,
453 ip->ip_src.s_addr, th->th_sport);
455 return(&tcp_thread[cpu].td_msgport);
459 tcp_addrport(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
461 return (&tcp_thread[tcp_addrcpu(faddr, fport,
462 laddr, lport)].td_msgport);
466 * Map a UDP socket to a protocol processing thread.
469 udp_soport(struct socket *so, struct sockaddr *nam __unused,
470 struct mbuf **dummy __unused, int req)
475 * The following processing all take place on Protocol Thread 0:
477 * attach() has a null socket parameter
478 * Fast and slow timeouts pass in null socket parameter
480 if (req == PRU_BIND || so == NULL)
481 return (&udp_thread[0].td_msgport);
486 if (IN_MULTICAST(ntohl(inp->inp_laddr.s_addr)))
487 return (&udp_thread[0].td_msgport);
491 * Rely on type-stable memory and check in protocol handler
492 * to fix race condition here w/ deallocation of inp. XXX JH
495 return (&udp_thread[INP_MPORT_HASH_UDP(inp->inp_faddr.s_addr,
496 inp->inp_laddr.s_addr, inp->inp_fport, inp->inp_lport)].td_msgport);
500 * Used to route icmp messages to the proper protocol thread for ctlinput
504 udp_ctlport(int cmd, struct sockaddr *sa, void *vip)
508 struct in_addr faddr;
511 faddr = ((struct sockaddr_in *)sa)->sin_addr;
512 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
514 if (PRC_IS_REDIRECT(cmd)) {
516 * See the comment in tcp_ctlport; the only difference
517 * is that message is forwarded to UDP protocol theads.
519 return cpu0_ctlport(cmd, sa, vip);
520 } else if (ip == NULL || cmd == PRC_HOSTDEAD) {
523 * Once UDP inpcbs are CPU localized, we should do
524 * the same forwarding as PRC_IS_REDIRECT(cmd)
528 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
530 cpu = INP_MPORT_HASH_UDP(faddr.s_addr, ip->ip_src.s_addr,
531 uh->uh_dport, uh->uh_sport);
533 return (&udp_thread[cpu].td_msgport);
537 * Map a network address to a processor.
540 tcp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
542 return (INP_MPORT_HASH_TCP(faddr, laddr, fport, lport));
546 udp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
549 if (IN_MULTICAST(ntohl(laddr)))
553 return (INP_MPORT_HASH_UDP(faddr, laddr, fport, lport));
557 * Return LWKT port for cpu.
562 return (&tcp_thread[cpu].td_msgport);
568 return (&udp_thread[cpu].td_msgport);
572 tcp_thread_init(void)
576 for (cpu = 0; cpu < ncpus2; cpu++) {
577 lwkt_create(tcpmsg_service_loop, NULL, NULL,
578 &tcp_thread[cpu], TDF_NETWORK | TDF_MPSAFE, cpu,
579 "tcp_thread %d", cpu);
580 netmsg_service_port_init(&tcp_thread[cpu].td_msgport);
585 udp_thread_init(void)
589 for (cpu = 0; cpu < ncpus2; cpu++) {
590 lwkt_create(netmsg_service_loop, &udp_mpsafe_thread, NULL,
591 &udp_thread[cpu], TDF_NETWORK | TDF_MPSAFE, cpu,
592 "udp_thread %d", cpu);
593 netmsg_service_port_init(&udp_thread[cpu].td_msgport);