1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef _NETINET_UDP_VAR_H_ 34 #define _NETINET_UDP_VAR_H_ 35 36 #include <sys/types.h> 37 #include <netinet/ip_var.h> 38 #include <netinet/udp.h> 39 40 /* 41 * UDP kernel structures and variables. 42 */ 43 struct udpiphdr { 44 struct ipovly ui_i; /* overlaid ip structure */ 45 struct udphdr ui_u; /* udp header */ 46 }; 47 #define ui_x1 ui_i.ih_x1 48 #define ui_v ui_i.ih_x1[0] 49 #define ui_pr ui_i.ih_pr 50 #define ui_len ui_i.ih_len 51 #define ui_src ui_i.ih_src 52 #define ui_dst ui_i.ih_dst 53 #define ui_sport ui_u.uh_sport 54 #define ui_dport ui_u.uh_dport 55 #define ui_ulen ui_u.uh_ulen 56 #define ui_sum ui_u.uh_sum 57 58 /* 59 * Identifiers for UDP sysctl nodes. 60 */ 61 #define UDPCTL_CHECKSUM 1 /* checksum UDP packets */ 62 #define UDPCTL_STATS 2 /* statistics (read-only) */ 63 #define UDPCTL_MAXDGRAM 3 /* max datagram size */ 64 #define UDPCTL_RECVSPACE 4 /* default receive buffer space */ 65 #define UDPCTL_PCBLIST 5 /* list of PCBs for UDP sockets */ 66 67 /* IPsec: ESP in UDP tunneling: */ 68 #define UF_ESPINUDP_NON_IKE 0x00000001 /* w/ non-IKE marker .. */ 69 /* .. per draft-ietf-ipsec-nat-t-ike-0[01], 70 * and draft-ietf-ipsec-udp-encaps-(00/)01.txt */ 71 #define UF_ESPINUDP 0x00000002 /* w/ non-ESP marker. */ 72 73 struct udpstat { 74 /* input statistics: */ 75 uint64_t udps_ipackets; /* total input packets */ 76 uint64_t udps_hdrops; /* packet shorter than header */ 77 uint64_t udps_badsum; /* checksum error */ 78 uint64_t udps_nosum; /* no checksum */ 79 uint64_t udps_badlen; /* data length larger than packet */ 80 uint64_t udps_noport; /* no socket on port */ 81 uint64_t udps_noportbcast; /* of above, arrived as broadcast */ 82 uint64_t udps_fullsock; /* not delivered, input socket full */ 83 uint64_t udpps_pcbcachemiss; /* input packets missing pcb cache */ 84 uint64_t udpps_pcbhashmiss; /* input packets not for hashed pcb */ 85 /* output statistics: */ 86 uint64_t udps_opackets; /* total output packets */ 87 uint64_t udps_fastout; /* output packets on fast path */ 88 /* of no socket on port, arrived as multicast */ 89 uint64_t udps_noportmcast; 90 uint64_t udps_filtermcast; /* blocked by multicast filter */ 91 }; 92 93 #ifdef _KERNEL 94 #include <netinet/in_pcb.h> 95 #include <sys/counter.h> 96 #include <netinet/in_kdtrace.h> 97 struct mbuf; 98 99 typedef bool udp_tun_func_t(struct mbuf *, int, struct inpcb *, 100 const struct sockaddr *, void *); 101 typedef union { 102 struct icmp *icmp; 103 struct ip6ctlparam *ip6cp; 104 } udp_tun_icmp_param_t __attribute__((__transparent_union__)); 105 typedef void udp_tun_icmp_t(udp_tun_icmp_param_t); 106 107 /* 108 * UDP control block; one per udp. 109 */ 110 struct udpcb { 111 struct inpcb u_inpcb; 112 #define u_start_zero u_tun_func 113 #define u_zero_size (sizeof(struct udpcb) - \ 114 offsetof(struct udpcb, u_start_zero)) 115 udp_tun_func_t *u_tun_func; /* UDP kernel tunneling callback. */ 116 udp_tun_icmp_t *u_icmp_func; /* UDP kernel tunneling icmp callback */ 117 u_int u_flags; /* Generic UDP flags. */ 118 uint16_t u_rxcslen; /* Coverage for incoming datagrams. */ 119 uint16_t u_txcslen; /* Coverage for outgoing datagrams. */ 120 void *u_tun_ctx; /* Tunneling callback context. */ 121 }; 122 123 #define intoudpcb(ip) __containerof((inp), struct udpcb, u_inpcb) 124 #define sotoudpcb(so) (intoudpcb(sotoinpcb(so))) 125 126 VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat); 127 /* 128 * In-kernel consumers can use these accessor macros directly to update 129 * stats. 130 */ 131 #define UDPSTAT_ADD(name, val) \ 132 do { \ 133 MIB_SDT_PROBE1(udp, count, name, (val)); \ 134 VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val)); \ 135 } while (0) 136 #define UDPSTAT_INC(name) UDPSTAT_ADD(name, 1) 137 138 /* 139 * Kernel module consumers must use this accessor macro. 140 */ 141 void kmod_udpstat_inc(int statnum); 142 #define KMOD_UDPSTAT_INC(name) \ 143 do { \ 144 MIB_SDT_PROBE1(udp, count, name, 1); \ 145 kmod_udpstat_inc( \ 146 offsetof(struct udpstat, name) / sizeof(uint64_t)); \ 147 } while (0) 148 149 SYSCTL_DECL(_net_inet_udp); 150 151 VNET_DECLARE(struct inpcbinfo, udbinfo); 152 VNET_DECLARE(struct inpcbinfo, ulitecbinfo); 153 #define V_udbinfo VNET(udbinfo) 154 #define V_ulitecbinfo VNET(ulitecbinfo) 155 156 extern u_long udp_sendspace; 157 extern u_long udp_recvspace; 158 VNET_DECLARE(int, udp_cksum); 159 VNET_DECLARE(int, udp_blackhole); 160 VNET_DECLARE(bool, udp_blackhole_local); 161 VNET_DECLARE(int, udp_log_in_vain); 162 #define V_udp_cksum VNET(udp_cksum) 163 #define V_udp_blackhole VNET(udp_blackhole) 164 #define V_udp_blackhole_local VNET(udp_blackhole_local) 165 #define V_udp_log_in_vain VNET(udp_log_in_vain) 166 167 VNET_DECLARE(int, zero_checksum_port); 168 #define V_zero_checksum_port VNET(zero_checksum_port) 169 170 static __inline struct inpcbinfo * 171 udp_get_inpcbinfo(int protocol) 172 { 173 return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo; 174 } 175 176 int udp_ctloutput(struct socket *, struct sockopt *); 177 void udplite_input(struct mbuf *, int); 178 struct inpcb *udp_notify(struct inpcb *inp, int errno); 179 int udp_shutdown(struct socket *, enum shutdown_how); 180 181 int udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, 182 udp_tun_icmp_t i, void *ctx); 183 184 #ifdef _SYS_PROTOSW_H_ 185 pr_abort_t udp_abort; 186 pr_disconnect_t udp_disconnect; 187 pr_send_t udp_send; 188 #endif 189 190 #endif /* _KERNEL */ 191 192 #endif /* _NETINET_UDP_VAR_H_ */ 193