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
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37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/socket.h>
41 #include <sys/socketvar.h>
42 #include <sys/thread.h>
43 #include <sys/sysctl.h>
44 #include <sys/globaldata.h>
47 #include <net/netisr2.h>
48 #include <net/toeplitz2.h>
50 #include <netinet/in_systm.h>
51 #include <netinet/in.h>
52 #include <netinet/in_var.h>
53 #include <netinet/in_pcb.h>
54 #include <netinet/ip.h>
55 #include <netinet/ip_var.h>
56 #include <netinet/tcp.h>
57 #include <netinet/tcpip.h>
58 #include <netinet/tcp_var.h>
59 #include <netinet/udp.h>
60 #include <netinet/udp_var.h>
63 * Toeplitz hash functions - the idea is to match the hardware.
66 INP_MPORT_HASH_UDP(in_addr_t faddr, in_addr_t laddr,
67 in_port_t fport, in_port_t lport)
69 return toeplitz_hash(toeplitz_rawhash_addr(faddr, laddr));
73 INP_MPORT_HASH_TCP(in_addr_t faddr, in_addr_t laddr,
74 in_port_t fport, in_port_t lport)
77 toeplitz_rawhash_addrport(faddr, laddr, fport, lport));
81 * Map a network address to a processor.
84 tcp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
86 return (netisr_hashcpu(INP_MPORT_HASH_TCP(faddr, laddr, fport, lport)));
90 udp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
93 * NOTE: laddr could be multicast, since UDP socket could be
94 * bound to multicast address.
96 if (IN_MULTICAST(ntohl(faddr)) || IN_MULTICAST(ntohl(laddr))) {
97 /* XXX handle multicast on CPU0 for now */
100 return (netisr_hashcpu(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) and any data preceding
108 * IP header (usually linker layer header) are in one mbuf (m_len).
109 * o IP header length is not less than the minimum (sizeof(struct ip)).
110 * o IP total length is not less than IP header length.
111 * o IP datagram resides completely in the mbuf chain,
112 * i.e. pkthdr.len >= IP total length.
114 * If the packet is a UDP datagram,
115 * o IP header (including any possible IP options) and UDP header are in
117 * o IP total length is not less than (IP header length + UDP header length).
119 * If the packet is a TCP segment,
120 * o IP header (including any possible IP options) and TCP header (including
121 * any possible TCP options) are in one mbuf (m_len).
122 * o TCP header length is not less than the minimum (sizeof(struct tcphdr)).
123 * o IP total length is not less than (IP header length + TCP header length).
126 ip_lengthcheck(struct mbuf **mp, int hoff)
128 struct mbuf *m = *mp;
130 int len, iphlen, iplen;
132 int thoff; /* TCP data offset */
134 len = hoff + sizeof(struct ip);
136 /* The packet must be at least the size of an IP header. */
137 if (m->m_pkthdr.len < len) {
138 ipstat.ips_tooshort++;
142 /* The fixed IP header must reside completely in the first mbuf. */
143 if (m->m_len < len) {
144 m = m_pullup(m, len);
146 ipstat.ips_toosmall++;
151 ip = mtodoff(m, struct ip *, hoff);
153 /* Bound check the packet's stated IP header length. */
154 iphlen = ip->ip_hl << 2;
155 if (iphlen < sizeof(struct ip)) { /* minimum header length */
156 ipstat.ips_badhlen++;
160 /* The full IP header must reside completely in the one mbuf. */
161 if (m->m_len < hoff + iphlen) {
162 m = m_pullup(m, hoff + iphlen);
164 ipstat.ips_badhlen++;
167 ip = mtodoff(m, struct ip *, hoff);
170 iplen = ntohs(ip->ip_len);
173 * Check that the amount of data in the buffers is as
174 * at least much as the IP header would have us expect.
176 if (m->m_pkthdr.len < hoff + iplen) {
177 ipstat.ips_tooshort++;
182 * Fragments other than the first fragment don't have much
183 * length information.
185 if (ntohs(ip->ip_off) & IP_OFFMASK)
189 * The TCP/IP or UDP/IP header must be entirely contained within
190 * the first fragment of a packet. Packet filters will break if they
193 * Since the packet will be trimmed to ip_len we must also make sure
194 * the potentially trimmed down length is still sufficient to hold
199 if (iplen < iphlen + sizeof(struct tcphdr)) {
200 ++tcpstat.tcps_rcvshort;
203 if (m->m_len < hoff + iphlen + sizeof(struct tcphdr)) {
204 m = m_pullup(m, hoff + iphlen + sizeof(struct tcphdr));
206 tcpstat.tcps_rcvshort++;
209 ip = mtodoff(m, struct ip *, hoff);
211 th = (struct tcphdr *)((caddr_t)ip + iphlen);
212 thoff = th->th_off << 2;
213 if (thoff < sizeof(struct tcphdr) ||
214 thoff + iphlen > ntohs(ip->ip_len)) {
215 tcpstat.tcps_rcvbadoff++;
218 if (m->m_len < hoff + iphlen + thoff) {
219 m = m_pullup(m, hoff + iphlen + thoff);
221 tcpstat.tcps_rcvshort++;
227 if (iplen < iphlen + sizeof(struct udphdr)) {
228 ++udp_stat.udps_hdrops;
231 if (m->m_len < hoff + iphlen + sizeof(struct udphdr)) {
232 m = m_pullup(m, hoff + iphlen + sizeof(struct udphdr));
234 udp_stat.udps_hdrops++;
241 if (iplen < iphlen) {
248 m->m_flags |= M_LENCHECKED;
260 * Assign a protocol processing thread to a packet. The IP header is at
261 * offset (hoff) in the packet (i.e. the mac header might still be intact).
263 * This function can blow away the mbuf if the packet is malformed.
266 ip_hashfn(struct mbuf **mptr, int hoff)
275 if (!ip_lengthcheck(mptr, hoff))
279 ip = mtodoff(m, struct ip *, hoff);
280 iphlen = ip->ip_hl << 2;
282 if (ntohs(ip->ip_off) & (IP_MF | IP_OFFMASK)) {
283 hash = toeplitz_hash(toeplitz_rawhash_addr(
284 ip->ip_src.s_addr, ip->ip_dst.s_addr));
290 th = (struct tcphdr *)((caddr_t)ip + iphlen);
291 hash = INP_MPORT_HASH_TCP(ip->ip_src.s_addr, ip->ip_dst.s_addr,
292 th->th_sport, th->th_dport);
296 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
297 /* XXX handle multicast on CPU0 for now */
301 uh = (struct udphdr *)((caddr_t)ip + iphlen);
302 hash = INP_MPORT_HASH_UDP(ip->ip_src.s_addr, ip->ip_dst.s_addr,
303 uh->uh_sport, uh->uh_dport);
311 m->m_flags |= M_HASH;
312 m->m_pkthdr.hash = hash;
316 * Verify and adjust the hash value of the packet.
318 * Unlike ip_hashfn(), the packet content is not accessed. The packet info
319 * (pi) and the hash of the packet (m_pkthdr.hash) is used instead.
321 * Caller has already made sure that m_pkthdr.hash is valid, i.e. m_flags
325 ip_hashcheck(struct mbuf *m, const struct pktinfo *pi)
327 KASSERT((m->m_flags & M_HASH), ("no valid packet hash"));
329 switch (pi->pi_l3proto) {
335 /* Let software calculate the hash */
336 m->m_flags &= ~M_HASH;
342 * This is used to map a socket to a message port for sendmsg() and friends.
343 * It is not called for any other purpose. In the case of TCP we just return
344 * the port already installed in the socket.
347 tcp_soport(struct socket *so, struct sockaddr *nam,
348 struct mbuf **dummy __unused)
354 * Used to route icmp messages to the proper protocol thread for ctlinput
358 tcp_ctlport(int cmd, struct sockaddr *sa, void *vip, int *cpuid)
364 notify = tcp_get_inpnotify(cmd, sa, &arg, &ip, cpuid);
368 if (*cpuid == ncpus) {
370 * Go through all CPUs.
372 * A new message will be allocated later to save necessary
373 * information and will be forwarded to all network protocol
374 * threads in the following way:
376 * (the the thread owns the msgport that we return here)
383 * [msg is kmalloc()ed]
386 * Later on, when the msg is received by netisr0:
388 * forwardmsg forwardmsg
389 * netisr0 ---------> netisr1 ---------> netisrN
392 return netisr_cpuport(0);
394 return netisr_cpuport(*cpuid);
399 tcp_addrport(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
401 return(netisr_cpuport(tcp_addrcpu(faddr, fport, laddr, lport)));
407 return(netisr_cpuport(0));
411 udp_addrport(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport)
413 return(netisr_cpuport(udp_addrcpu(faddr, fport, laddr, lport)));
417 * Used to route icmp messages to the proper protocol thread for ctlinput
421 udp_ctlport(int cmd, struct sockaddr *sa, void *vip, int *cpuid)
426 notify = udp_get_inpnotify(cmd, sa, &ip, cpuid);
430 if (*cpuid == ncpus) {
432 * Go through all CPUs.
434 * See the comment in tcp_ctlport.
436 return netisr_cpuport(0);
438 return netisr_cpuport(*cpuid);
445 return netisr_cpuport(mycpuid & ncpus2_mask);
451 return netisr_cpuport(mycpuid & ncpus2_mask);