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
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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>
50 #include <net/toeplitz2.h>
52 #include <netinet/in_systm.h>
53 #include <netinet/in.h>
54 #include <netinet/in_var.h>
55 #include <netinet/in_pcb.h>
56 #include <netinet/ip.h>
57 #include <netinet/ip_var.h>
58 #include <netinet/tcp.h>
59 #include <netinet/tcpip.h>
60 #include <netinet/tcp_var.h>
61 #include <netinet/udp.h>
62 #include <netinet/udp_var.h>
64 extern int udp_mpsafe_thread;
67 * Toeplitz hash functions - the idea is to match the hardware.
70 INP_MPORT_HASH_UDP(in_addr_t faddr, in_addr_t laddr,
71 in_port_t fport, in_port_t lport)
73 return toeplitz_hash(toeplitz_rawhash_addr(faddr, laddr));
77 INP_MPORT_HASH_TCP(in_addr_t faddr, in_addr_t laddr,
78 in_port_t fport, in_port_t lport)
81 toeplitz_rawhash_addrport(faddr, laddr, fport, lport));
85 * Map a network address to a processor.
88 tcp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
90 return (INP_MPORT_HASH_TCP(faddr, laddr, fport, lport));
94 * Not implemented yet, use protocol thread 0
97 udp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
99 /*return (INP_MPORT_HASH_UDP(faddr, laddr, fport, lport));*/
104 * If the packet is a valid IP datagram, upon returning of this function
105 * following things are promised:
107 * o IP header (including any possible IP options) is in one mbuf (m_len).
108 * o IP header length is not less than the minimum (sizeof(struct ip)).
109 * o IP total length is not less than IP header length.
110 * o IP datagram resides completely in the mbuf chain,
111 * i.e. pkthdr.len >= IP total length.
113 * If the packet is a UDP datagram,
114 * o IP header (including any possible IP options) and UDP header are in
116 * o IP total length is not less than (IP header length + UDP header length).
118 * If the packet is a TCP segment,
119 * o IP header (including any possible IP options) and TCP header (including
120 * any possible TCP options) are in one mbuf (m_len).
121 * o TCP header length is not less than the minimum (sizeof(struct tcphdr)).
122 * o IP total length is not less than (IP header length + TCP header length).
125 ip_lengthcheck(struct mbuf **mp, int hoff)
127 struct mbuf *m = *mp;
129 int len, iphlen, iplen;
131 int thoff; /* TCP data offset */
133 len = hoff + sizeof(struct ip);
135 /* The packet must be at least the size of an IP header. */
136 if (m->m_pkthdr.len < len) {
137 kprintf("pkthdr %d %d < %d\n", (m->m_flags & M_PKTHDR),
138 m->m_pkthdr.len, len);
139 ipstat.ips_tooshort++;
143 /* The fixed IP header must reside completely in the first mbuf. */
144 if (m->m_len < len) {
145 m = m_pullup(m, len);
147 kprintf("can't pullup %d\n", len);
148 ipstat.ips_toosmall++;
153 ip = mtodoff(m, struct ip *, hoff);
155 /* Bound check the packet's stated IP header length. */
156 iphlen = ip->ip_hl << 2;
157 if (iphlen < sizeof(struct ip)) { /* minimum header length */
158 ipstat.ips_badhlen++;
162 /* The full IP header must reside completely in the one mbuf. */
163 if (m->m_len < hoff + iphlen) {
164 m = m_pullup(m, hoff + iphlen);
166 ipstat.ips_badhlen++;
169 ip = mtodoff(m, struct ip *, hoff);
172 iplen = ntohs(ip->ip_len);
175 * Check that the amount of data in the buffers is as
176 * at least much as the IP header would have us expect.
178 if (m->m_pkthdr.len < hoff + iplen) {
179 kprintf("data in buffer not enough %d - %d vs %d+%d\n",
180 (m->m_flags & M_PKTHDR),
181 m->m_pkthdr.len, hoff, iplen);
182 ipstat.ips_tooshort++;
187 * Fragments other than the first fragment don't have much
188 * length information.
190 if (ntohs(ip->ip_off) & IP_OFFMASK)
194 * The TCP/IP or UDP/IP header must be entirely contained within
195 * the first fragment of a packet. Packet filters will break if they
198 * Since the packet will be trimmed to ip_len we must also make sure
199 * the potentially trimmed down length is still sufficient to hold
204 if (iplen < iphlen + sizeof(struct tcphdr)) {
205 ++tcpstat.tcps_rcvshort;
208 if (m->m_len < hoff + iphlen + sizeof(struct tcphdr)) {
209 m = m_pullup(m, hoff + iphlen + sizeof(struct tcphdr));
211 tcpstat.tcps_rcvshort++;
214 ip = mtodoff(m, struct ip *, hoff);
216 th = (struct tcphdr *)((caddr_t)ip + iphlen);
217 thoff = th->th_off << 2;
218 if (thoff < sizeof(struct tcphdr) ||
219 thoff + iphlen > ntohs(ip->ip_len)) {
220 tcpstat.tcps_rcvbadoff++;
223 if (m->m_len < hoff + iphlen + thoff) {
224 m = m_pullup(m, hoff + iphlen + thoff);
226 tcpstat.tcps_rcvshort++;
232 if (iplen < iphlen + sizeof(struct udphdr)) {
233 ++udpstat.udps_hdrops;
236 if (m->m_len < hoff + iphlen + sizeof(struct udphdr)) {
237 m = m_pullup(m, hoff + iphlen + sizeof(struct udphdr));
239 udpstat.udps_hdrops++;
246 if (iplen < iphlen) {
253 m->m_flags |= M_LENCHECKED;
265 * Assign a protocol processing thread to a packet. The IP header is at
266 * offset (hoff) in the packet (i.e. the mac header might still be intact).
268 * This function can blow away the mbuf if the packet is malformed.
271 ip_cpufn(struct mbuf **mptr, int hoff, int dir)
278 int thoff; /* TCP data offset */
281 if (!ip_lengthcheck(mptr, hoff))
285 ip = mtodoff(m, struct ip *, hoff);
286 iphlen = ip->ip_hl << 2;
289 * XXX generic packet handling defrag on CPU 0 for now.
291 if (ntohs(ip->ip_off) & (IP_MF | IP_OFFMASK)) {
298 th = (struct tcphdr *)((caddr_t)ip + iphlen);
299 thoff = th->th_off << 2;
300 cpu = INP_MPORT_HASH_TCP(ip->ip_src.s_addr,
307 uh = (struct udphdr *)((caddr_t)ip + iphlen);
309 cpu = INP_MPORT_HASH_UDP(ip->ip_src.s_addr,
320 m->m_flags |= M_HASH;
321 m->m_pkthdr.hash = cpu;
325 ip_cpufn_in(struct mbuf **mptr, int hoff)
327 ip_cpufn(mptr, hoff, IP_MPORT_IN);
333 * Map a packet to a protocol processing thread and return the thread's port.
334 * Unlike ip_cpufn(), the packet content is not accessed. The packet info
335 * (pi) and the hash of the packet (m_pkthdr.hash) is used instead. NULL is
336 * returned if the packet info does not contain enough information.
338 * Caller has already made sure that m_pkthdr.hash is valid, i.e. m_flags
342 ip_mport_pktinfo(const struct pktinfo *pi, struct mbuf *m)
346 KASSERT(m->m_pkthdr.hash < ncpus2,
347 ("invalid packet hash %#x\n", m->m_pkthdr.hash));
350 * XXX generic packet handling defrag on CPU 0 for now.
352 if (pi->pi_flags & PKTINFO_FLAG_FRAG) {
353 m->m_pkthdr.hash = 0;
354 return cpu_portfn(0);
357 switch (pi->pi_l3proto) {
359 port = cpu_portfn(m->m_pkthdr.hash);
363 port = cpu_portfn(m->m_pkthdr.hash);
376 * This is used to map a socket to a message port for sendmsg() and friends.
377 * It is not called for any other purpose. In the case of TCP we just return
378 * the port already installed in the socket.
381 tcp_soport(struct socket *so, struct sockaddr *nam,
382 struct mbuf **dummy __unused)
388 * Used to route icmp messages to the proper protocol thread for ctlinput
392 tcp_ctlport(int cmd, struct sockaddr *sa, void *vip)
396 struct in_addr faddr;
399 faddr = ((struct sockaddr_in *)sa)->sin_addr;
400 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
402 if (ip == NULL || PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
404 * Message will be forwarded to all TCP protocol threads
407 * netisr0 (the msgport we return here)
410 * | domsg <----------------------------+
414 * V forwardmsg forwardmsg |
415 * tcp0 ------------> tcp1 ------------> tcpN
417 return cpu0_ctlport(cmd, sa, vip);
419 th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2));
420 cpu = tcp_addrcpu(faddr.s_addr, th->th_dport,
421 ip->ip_src.s_addr, th->th_sport);
423 return(cpu_portfn(cpu));
427 tcp_addrport(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
429 return(cpu_portfn(tcp_addrcpu(faddr, fport, laddr, lport)));
435 return(cpu_portfn(0));
439 udp_addrport(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
441 return(cpu_portfn(udp_addrcpu(faddr, fport, laddr, lport)));
445 * Used to route icmp messages to the proper protocol thread for ctlinput
449 udp_ctlport(int cmd, struct sockaddr *sa, void *vip)
453 struct in_addr faddr;
456 faddr = ((struct sockaddr_in *)sa)->sin_addr;
457 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
459 if (PRC_IS_REDIRECT(cmd)) {
461 * See the comment in tcp_ctlport; the only difference
462 * is that message is forwarded to UDP protocol theads.
464 return cpu0_ctlport(cmd, sa, vip);
465 } else if (ip == NULL || cmd == PRC_HOSTDEAD) {
468 * Once UDP inpcbs are CPU localized, we should do
469 * the same forwarding as PRC_IS_REDIRECT(cmd)
473 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
475 cpu = INP_MPORT_HASH_UDP(faddr.s_addr, ip->ip_src.s_addr,
476 uh->uh_dport, uh->uh_sport);
478 return (cpu_portfn(cpu));