Consolidate all IP Options handling functions into ip_options.[ch] and
include ip_options.h into all files making use of IP Options functions. From ip_input.c rev 1.306: ip_dooptions(struct mbuf *m, int pass) save_rte(m, option, dst) ip_srcroute(m0) ip_stripoptions(m, mopt) From ip_output.c rev 1.249: ip_insertoptions(m, opt, phlen) ip_optcopy(ip, jp) ip_pcbopts(struct inpcb *inp, int optname, struct mbuf *m) No functional changes in this commit. Discussed with: rwatson Sponsored by: TCP/IP Optimization Fundraise 2005
This commit is contained in:
parent
054ff3bee0
commit
ef39adf007
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=152592
@ -1678,6 +1678,7 @@ netinet/ip_fw_pfil.c optional ipfirewall
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netinet/ip_icmp.c optional inet
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netinet/ip_input.c optional inet
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netinet/ip_mroute.c optional mrouting
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netinet/ip_options.c optional inet
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netinet/ip_output.c optional inet
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netinet/raw_ip.c optional inet
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netinet/tcp_debug.c optional tcpdebug
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@ -65,6 +65,7 @@
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_options.h>
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#include <netinet/igmp.h>
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#include <netinet/igmp_var.h>
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@ -100,6 +100,7 @@
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_options.h>
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#include <machine/in_cksum.h>
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@ -54,6 +54,7 @@
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_options.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcpip.h>
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@ -66,6 +66,7 @@
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_options.h>
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#include <machine/in_cksum.h>
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#ifdef DEV_CARP
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#include <netinet/ip_carp.h>
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@ -101,19 +102,6 @@ int ip_defttl = IPDEFTTL;
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SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW,
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&ip_defttl, 0, "Maximum TTL on IP packets");
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static int ip_dosourceroute = 0;
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SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW,
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&ip_dosourceroute, 0, "Enable forwarding source routed IP packets");
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static int ip_acceptsourceroute = 0;
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SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
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CTLFLAG_RW, &ip_acceptsourceroute, 0,
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"Enable accepting source routed IP packets");
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int ip_doopts = 1; /* 0 = ignore, 1 = process, 2 = reject */
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SYSCTL_INT(_net_inet_ip, OID_AUTO, process_options, CTLFLAG_RW,
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&ip_doopts, 0, "Enable IP options processing ([LS]SRR, RR, TS)");
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static int ip_keepfaith = 0;
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SYSCTL_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
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&ip_keepfaith, 0,
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@ -218,25 +206,6 @@ ip_dn_io_t *ip_dn_io_ptr = NULL;
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int fw_enable = 1;
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int fw_one_pass = 1;
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/*
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* XXX this is ugly. IP options source routing magic.
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*/
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struct ipoptrt {
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struct in_addr dst; /* final destination */
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char nop; /* one NOP to align */
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char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
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struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
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};
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struct ipopt_tag {
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struct m_tag tag;
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int ip_nhops;
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struct ipoptrt ip_srcrt;
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};
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static void save_rte(struct mbuf *, u_char *, struct in_addr);
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static int ip_dooptions(struct mbuf *m, int);
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static void ip_forward(struct mbuf *m, int srcrt);
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static void ip_freef(struct ipqhead *, struct ipq *);
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/*
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@ -1239,289 +1208,6 @@ ipproto_unregister(u_char ipproto)
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return (0);
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}
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/*
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* Do option processing on a datagram,
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* possibly discarding it if bad options are encountered,
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* or forwarding it if source-routed.
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* The pass argument is used when operating in the IPSTEALTH
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* mode to tell what options to process:
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* [LS]SRR (pass 0) or the others (pass 1).
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* The reason for as many as two passes is that when doing IPSTEALTH,
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* non-routing options should be processed only if the packet is for us.
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* Returns 1 if packet has been forwarded/freed,
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* 0 if the packet should be processed further.
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*/
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static int
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ip_dooptions(struct mbuf *m, int pass)
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{
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struct ip *ip = mtod(m, struct ip *);
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u_char *cp;
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struct in_ifaddr *ia;
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int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
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struct in_addr *sin, dst;
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n_time ntime;
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struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
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/* ignore or reject packets with IP options */
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if (ip_doopts == 0)
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return 0;
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else if (ip_doopts == 2) {
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type = ICMP_UNREACH;
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code = ICMP_UNREACH_FILTER_PROHIB;
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goto bad;
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}
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dst = ip->ip_dst;
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cp = (u_char *)(ip + 1);
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cnt = (ip->ip_hl << 2) - sizeof (struct ip);
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for (; cnt > 0; cnt -= optlen, cp += optlen) {
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opt = cp[IPOPT_OPTVAL];
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if (opt == IPOPT_EOL)
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break;
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if (opt == IPOPT_NOP)
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optlen = 1;
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else {
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if (cnt < IPOPT_OLEN + sizeof(*cp)) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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optlen = cp[IPOPT_OLEN];
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if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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}
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switch (opt) {
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default:
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break;
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/*
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* Source routing with record.
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* Find interface with current destination address.
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* If none on this machine then drop if strictly routed,
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* or do nothing if loosely routed.
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* Record interface address and bring up next address
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* component. If strictly routed make sure next
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* address is on directly accessible net.
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*/
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case IPOPT_LSRR:
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case IPOPT_SSRR:
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#ifdef IPSTEALTH
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if (ipstealth && pass > 0)
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break;
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#endif
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if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
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}
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ipaddr.sin_addr = ip->ip_dst;
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ia = (struct in_ifaddr *)
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ifa_ifwithaddr((struct sockaddr *)&ipaddr);
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if (ia == NULL) {
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if (opt == IPOPT_SSRR) {
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type = ICMP_UNREACH;
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code = ICMP_UNREACH_SRCFAIL;
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goto bad;
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}
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if (!ip_dosourceroute)
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goto nosourcerouting;
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/*
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* Loose routing, and not at next destination
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* yet; nothing to do except forward.
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*/
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break;
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}
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off--; /* 0 origin */
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if (off > optlen - (int)sizeof(struct in_addr)) {
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/*
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* End of source route. Should be for us.
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*/
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if (!ip_acceptsourceroute)
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goto nosourcerouting;
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save_rte(m, cp, ip->ip_src);
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break;
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}
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#ifdef IPSTEALTH
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if (ipstealth)
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goto dropit;
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#endif
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if (!ip_dosourceroute) {
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if (ipforwarding) {
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char buf[16]; /* aaa.bbb.ccc.ddd\0 */
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/*
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* Acting as a router, so generate ICMP
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*/
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nosourcerouting:
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strcpy(buf, inet_ntoa(ip->ip_dst));
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log(LOG_WARNING,
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"attempted source route from %s to %s\n",
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inet_ntoa(ip->ip_src), buf);
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type = ICMP_UNREACH;
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code = ICMP_UNREACH_SRCFAIL;
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goto bad;
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} else {
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/*
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* Not acting as a router, so silently drop.
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*/
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#ifdef IPSTEALTH
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dropit:
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#endif
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ipstat.ips_cantforward++;
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m_freem(m);
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return (1);
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}
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}
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/*
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* locate outgoing interface
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*/
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(void)memcpy(&ipaddr.sin_addr, cp + off,
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sizeof(ipaddr.sin_addr));
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if (opt == IPOPT_SSRR) {
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#define INA struct in_ifaddr *
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#define SA struct sockaddr *
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if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == NULL)
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ia = (INA)ifa_ifwithnet((SA)&ipaddr);
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} else
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ia = ip_rtaddr(ipaddr.sin_addr);
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if (ia == NULL) {
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type = ICMP_UNREACH;
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code = ICMP_UNREACH_SRCFAIL;
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goto bad;
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}
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ip->ip_dst = ipaddr.sin_addr;
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(void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr),
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sizeof(struct in_addr));
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cp[IPOPT_OFFSET] += sizeof(struct in_addr);
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/*
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* Let ip_intr's mcast routing check handle mcast pkts
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*/
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forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
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break;
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case IPOPT_RR:
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#ifdef IPSTEALTH
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if (ipstealth && pass == 0)
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break;
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#endif
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if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
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}
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if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
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}
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/*
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* If no space remains, ignore.
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*/
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off--; /* 0 origin */
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if (off > optlen - (int)sizeof(struct in_addr))
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break;
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(void)memcpy(&ipaddr.sin_addr, &ip->ip_dst,
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sizeof(ipaddr.sin_addr));
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/*
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* locate outgoing interface; if we're the destination,
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* use the incoming interface (should be same).
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*/
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if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
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(ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
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type = ICMP_UNREACH;
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code = ICMP_UNREACH_HOST;
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goto bad;
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}
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(void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr),
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sizeof(struct in_addr));
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cp[IPOPT_OFFSET] += sizeof(struct in_addr);
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break;
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case IPOPT_TS:
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#ifdef IPSTEALTH
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if (ipstealth && pass == 0)
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break;
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#endif
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code = cp - (u_char *)ip;
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if (optlen < 4 || optlen > 40) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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if ((off = cp[IPOPT_OFFSET]) < 5) {
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code = &cp[IPOPT_OLEN] - (u_char *)ip;
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goto bad;
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}
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if (off > optlen - (int)sizeof(int32_t)) {
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cp[IPOPT_OFFSET + 1] += (1 << 4);
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if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
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}
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break;
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}
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off--; /* 0 origin */
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sin = (struct in_addr *)(cp + off);
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switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
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case IPOPT_TS_TSONLY:
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break;
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case IPOPT_TS_TSANDADDR:
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if (off + sizeof(n_time) +
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sizeof(struct in_addr) > optlen) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
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}
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ipaddr.sin_addr = dst;
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ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
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m->m_pkthdr.rcvif);
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if (ia == NULL)
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continue;
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(void)memcpy(sin, &IA_SIN(ia)->sin_addr,
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sizeof(struct in_addr));
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cp[IPOPT_OFFSET] += sizeof(struct in_addr);
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off += sizeof(struct in_addr);
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break;
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case IPOPT_TS_PRESPEC:
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if (off + sizeof(n_time) +
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sizeof(struct in_addr) > optlen) {
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code = &cp[IPOPT_OFFSET] - (u_char *)ip;
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goto bad;
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}
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(void)memcpy(&ipaddr.sin_addr, sin,
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sizeof(struct in_addr));
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if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
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continue;
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cp[IPOPT_OFFSET] += sizeof(struct in_addr);
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off += sizeof(struct in_addr);
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break;
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default:
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code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
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goto bad;
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}
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ntime = iptime();
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(void)memcpy(cp + off, &ntime, sizeof(n_time));
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cp[IPOPT_OFFSET] += sizeof(n_time);
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}
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}
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if (forward && ipforwarding) {
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ip_forward(m, 1);
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return (1);
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}
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return (0);
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bad:
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icmp_error(m, type, code, 0, 0);
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ipstat.ips_badoptions++;
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return (1);
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}
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/*
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* Given address of next destination (final or next hop),
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* return internet address info of interface to be used to get there.
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@ -1549,143 +1235,6 @@ ip_rtaddr(dst)
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return (ifa);
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}
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/*
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* Save incoming source route for use in replies,
|
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* to be picked up later by ip_srcroute if the receiver is interested.
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*/
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static void
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save_rte(m, option, dst)
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struct mbuf *m;
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u_char *option;
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struct in_addr dst;
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{
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unsigned olen;
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struct ipopt_tag *opts;
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|
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opts = (struct ipopt_tag *)m_tag_get(PACKET_TAG_IPOPTIONS,
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sizeof(struct ipopt_tag), M_NOWAIT);
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if (opts == NULL)
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return;
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olen = option[IPOPT_OLEN];
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#ifdef DIAGNOSTIC
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if (ipprintfs)
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printf("save_rte: olen %d\n", olen);
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#endif
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if (olen > sizeof(opts->ip_srcrt) - (1 + sizeof(dst))) {
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m_tag_free((struct m_tag *)opts);
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return;
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}
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bcopy(option, opts->ip_srcrt.srcopt, olen);
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opts->ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
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opts->ip_srcrt.dst = dst;
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m_tag_prepend(m, (struct m_tag *)opts);
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}
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/*
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* Retrieve incoming source route for use in replies,
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* in the same form used by setsockopt.
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* The first hop is placed before the options, will be removed later.
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*/
|
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struct mbuf *
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ip_srcroute(m0)
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struct mbuf *m0;
|
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{
|
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register struct in_addr *p, *q;
|
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register struct mbuf *m;
|
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struct ipopt_tag *opts;
|
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|
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opts = (struct ipopt_tag *)m_tag_find(m0, PACKET_TAG_IPOPTIONS, NULL);
|
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if (opts == NULL)
|
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return (NULL);
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|
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if (opts->ip_nhops == 0)
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return (NULL);
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m = m_get(M_DONTWAIT, MT_DATA);
|
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if (m == NULL)
|
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return (NULL);
|
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|
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#define OPTSIZ (sizeof(opts->ip_srcrt.nop) + sizeof(opts->ip_srcrt.srcopt))
|
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|
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/* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
|
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m->m_len = opts->ip_nhops * sizeof(struct in_addr) +
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sizeof(struct in_addr) + OPTSIZ;
|
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#ifdef DIAGNOSTIC
|
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if (ipprintfs)
|
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printf("ip_srcroute: nhops %d mlen %d", opts->ip_nhops, m->m_len);
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#endif
|
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|
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/*
|
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* First save first hop for return route
|
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*/
|
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p = &(opts->ip_srcrt.route[opts->ip_nhops - 1]);
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*(mtod(m, struct in_addr *)) = *p--;
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#ifdef DIAGNOSTIC
|
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if (ipprintfs)
|
||||
printf(" hops %lx", (u_long)ntohl(mtod(m, struct in_addr *)->s_addr));
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Copy option fields and padding (nop) to mbuf.
|
||||
*/
|
||||
opts->ip_srcrt.nop = IPOPT_NOP;
|
||||
opts->ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
|
||||
(void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr),
|
||||
&(opts->ip_srcrt.nop), OPTSIZ);
|
||||
q = (struct in_addr *)(mtod(m, caddr_t) +
|
||||
sizeof(struct in_addr) + OPTSIZ);
|
||||
#undef OPTSIZ
|
||||
/*
|
||||
* Record return path as an IP source route,
|
||||
* reversing the path (pointers are now aligned).
|
||||
*/
|
||||
while (p >= opts->ip_srcrt.route) {
|
||||
#ifdef DIAGNOSTIC
|
||||
if (ipprintfs)
|
||||
printf(" %lx", (u_long)ntohl(q->s_addr));
|
||||
#endif
|
||||
*q++ = *p--;
|
||||
}
|
||||
/*
|
||||
* Last hop goes to final destination.
|
||||
*/
|
||||
*q = opts->ip_srcrt.dst;
|
||||
#ifdef DIAGNOSTIC
|
||||
if (ipprintfs)
|
||||
printf(" %lx\n", (u_long)ntohl(q->s_addr));
|
||||
#endif
|
||||
m_tag_delete(m0, (struct m_tag *)opts);
|
||||
return (m);
|
||||
}
|
||||
|
||||
/*
|
||||
* Strip out IP options, at higher
|
||||
* level protocol in the kernel.
|
||||
* Second argument is buffer to which options
|
||||
* will be moved, and return value is their length.
|
||||
* XXX should be deleted; last arg currently ignored.
|
||||
*/
|
||||
void
|
||||
ip_stripoptions(m, mopt)
|
||||
register struct mbuf *m;
|
||||
struct mbuf *mopt;
|
||||
{
|
||||
register int i;
|
||||
struct ip *ip = mtod(m, struct ip *);
|
||||
register caddr_t opts;
|
||||
int olen;
|
||||
|
||||
olen = (ip->ip_hl << 2) - sizeof (struct ip);
|
||||
opts = (caddr_t)(ip + 1);
|
||||
i = m->m_len - (sizeof (struct ip) + olen);
|
||||
bcopy(opts + olen, opts, (unsigned)i);
|
||||
m->m_len -= olen;
|
||||
if (m->m_flags & M_PKTHDR)
|
||||
m->m_pkthdr.len -= olen;
|
||||
ip->ip_v = IPVERSION;
|
||||
ip->ip_hl = sizeof(struct ip) >> 2;
|
||||
}
|
||||
|
||||
u_char inetctlerrmap[PRC_NCMDS] = {
|
||||
0, 0, 0, 0,
|
||||
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
|
||||
|
@ -90,6 +90,7 @@
|
||||
#include <netinet/ip_encap.h>
|
||||
#include <netinet/ip_mroute.h>
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
#ifdef PIM
|
||||
#include <netinet/pim.h>
|
||||
#include <netinet/pim_var.h>
|
||||
|
708
sys/netinet/ip_options.c
Normal file
708
sys/netinet/ip_options.c
Normal file
@ -0,0 +1,708 @@
|
||||
/*
|
||||
* Copyright (c) 1982, 1986, 1988, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
* Copyright (c) 2005
|
||||
* Andre Oppermann, Internet Business Solutions AG. All right 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.
|
||||
* 4. 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.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#include "opt_ipstealth.h"
|
||||
#include "opt_mac.h"
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/mac.h>
|
||||
#include <sys/mbuf.h>
|
||||
/* #include <sys/malloc.h> */
|
||||
#include <sys/domain.h>
|
||||
#include <sys/protosw.h>
|
||||
#include <sys/socket.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/syslog.h>
|
||||
#include <sys/sysctl.h>
|
||||
|
||||
#include <net/if.h>
|
||||
#include <net/if_types.h>
|
||||
#include <net/if_var.h>
|
||||
#include <net/if_dl.h>
|
||||
#include <net/route.h>
|
||||
#include <net/netisr.h>
|
||||
|
||||
#include <netinet/in.h>
|
||||
#include <netinet/in_systm.h>
|
||||
#include <netinet/in_var.h>
|
||||
#include <netinet/ip.h>
|
||||
#include <netinet/in_pcb.h>
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
#include <netinet/ip_icmp.h>
|
||||
#include <machine/in_cksum.h>
|
||||
|
||||
#include <sys/socketvar.h>
|
||||
|
||||
static int ip_dosourceroute = 0;
|
||||
SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW,
|
||||
&ip_dosourceroute, 0, "Enable forwarding source routed IP packets");
|
||||
|
||||
static int ip_acceptsourceroute = 0;
|
||||
SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
|
||||
CTLFLAG_RW, &ip_acceptsourceroute, 0,
|
||||
"Enable accepting source routed IP packets");
|
||||
|
||||
int ip_doopts = 1; /* 0 = ignore, 1 = process, 2 = reject */
|
||||
SYSCTL_INT(_net_inet_ip, OID_AUTO, process_options, CTLFLAG_RW,
|
||||
&ip_doopts, 0, "Enable IP options processing ([LS]SRR, RR, TS)");
|
||||
|
||||
static void save_rte(struct mbuf *m, u_char *, struct in_addr);
|
||||
|
||||
/*
|
||||
* Do option processing on a datagram,
|
||||
* possibly discarding it if bad options are encountered,
|
||||
* or forwarding it if source-routed.
|
||||
* The pass argument is used when operating in the IPSTEALTH
|
||||
* mode to tell what options to process:
|
||||
* [LS]SRR (pass 0) or the others (pass 1).
|
||||
* The reason for as many as two passes is that when doing IPSTEALTH,
|
||||
* non-routing options should be processed only if the packet is for us.
|
||||
* Returns 1 if packet has been forwarded/freed,
|
||||
* 0 if the packet should be processed further.
|
||||
*/
|
||||
int
|
||||
ip_dooptions(struct mbuf *m, int pass)
|
||||
{
|
||||
struct ip *ip = mtod(m, struct ip *);
|
||||
u_char *cp;
|
||||
struct in_ifaddr *ia;
|
||||
int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
|
||||
struct in_addr *sin, dst;
|
||||
n_time ntime;
|
||||
struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
|
||||
|
||||
/* ignore or reject packets with IP options */
|
||||
if (ip_doopts == 0)
|
||||
return 0;
|
||||
else if (ip_doopts == 2) {
|
||||
type = ICMP_UNREACH;
|
||||
code = ICMP_UNREACH_FILTER_PROHIB;
|
||||
goto bad;
|
||||
}
|
||||
|
||||
dst = ip->ip_dst;
|
||||
cp = (u_char *)(ip + 1);
|
||||
cnt = (ip->ip_hl << 2) - sizeof (struct ip);
|
||||
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
||||
opt = cp[IPOPT_OPTVAL];
|
||||
if (opt == IPOPT_EOL)
|
||||
break;
|
||||
if (opt == IPOPT_NOP)
|
||||
optlen = 1;
|
||||
else {
|
||||
if (cnt < IPOPT_OLEN + sizeof(*cp)) {
|
||||
code = &cp[IPOPT_OLEN] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
optlen = cp[IPOPT_OLEN];
|
||||
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
|
||||
code = &cp[IPOPT_OLEN] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
}
|
||||
switch (opt) {
|
||||
|
||||
default:
|
||||
break;
|
||||
|
||||
/*
|
||||
* Source routing with record.
|
||||
* Find interface with current destination address.
|
||||
* If none on this machine then drop if strictly routed,
|
||||
* or do nothing if loosely routed.
|
||||
* Record interface address and bring up next address
|
||||
* component. If strictly routed make sure next
|
||||
* address is on directly accessible net.
|
||||
*/
|
||||
case IPOPT_LSRR:
|
||||
case IPOPT_SSRR:
|
||||
#ifdef IPSTEALTH
|
||||
if (ipstealth && pass > 0)
|
||||
break;
|
||||
#endif
|
||||
if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
|
||||
code = &cp[IPOPT_OLEN] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
||||
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
ipaddr.sin_addr = ip->ip_dst;
|
||||
ia = (struct in_ifaddr *)
|
||||
ifa_ifwithaddr((struct sockaddr *)&ipaddr);
|
||||
if (ia == NULL) {
|
||||
if (opt == IPOPT_SSRR) {
|
||||
type = ICMP_UNREACH;
|
||||
code = ICMP_UNREACH_SRCFAIL;
|
||||
goto bad;
|
||||
}
|
||||
if (!ip_dosourceroute)
|
||||
goto nosourcerouting;
|
||||
/*
|
||||
* Loose routing, and not at next destination
|
||||
* yet; nothing to do except forward.
|
||||
*/
|
||||
break;
|
||||
}
|
||||
off--; /* 0 origin */
|
||||
if (off > optlen - (int)sizeof(struct in_addr)) {
|
||||
/*
|
||||
* End of source route. Should be for us.
|
||||
*/
|
||||
if (!ip_acceptsourceroute)
|
||||
goto nosourcerouting;
|
||||
save_rte(m, cp, ip->ip_src);
|
||||
break;
|
||||
}
|
||||
#ifdef IPSTEALTH
|
||||
if (ipstealth)
|
||||
goto dropit;
|
||||
#endif
|
||||
if (!ip_dosourceroute) {
|
||||
if (ipforwarding) {
|
||||
char buf[16]; /* aaa.bbb.ccc.ddd\0 */
|
||||
/*
|
||||
* Acting as a router, so generate ICMP
|
||||
*/
|
||||
nosourcerouting:
|
||||
strcpy(buf, inet_ntoa(ip->ip_dst));
|
||||
log(LOG_WARNING,
|
||||
"attempted source route from %s to %s\n",
|
||||
inet_ntoa(ip->ip_src), buf);
|
||||
type = ICMP_UNREACH;
|
||||
code = ICMP_UNREACH_SRCFAIL;
|
||||
goto bad;
|
||||
} else {
|
||||
/*
|
||||
* Not acting as a router, so silently drop.
|
||||
*/
|
||||
#ifdef IPSTEALTH
|
||||
dropit:
|
||||
#endif
|
||||
ipstat.ips_cantforward++;
|
||||
m_freem(m);
|
||||
return (1);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* locate outgoing interface
|
||||
*/
|
||||
(void)memcpy(&ipaddr.sin_addr, cp + off,
|
||||
sizeof(ipaddr.sin_addr));
|
||||
|
||||
if (opt == IPOPT_SSRR) {
|
||||
#define INA struct in_ifaddr *
|
||||
#define SA struct sockaddr *
|
||||
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == NULL)
|
||||
ia = (INA)ifa_ifwithnet((SA)&ipaddr);
|
||||
} else
|
||||
ia = ip_rtaddr(ipaddr.sin_addr);
|
||||
if (ia == NULL) {
|
||||
type = ICMP_UNREACH;
|
||||
code = ICMP_UNREACH_SRCFAIL;
|
||||
goto bad;
|
||||
}
|
||||
ip->ip_dst = ipaddr.sin_addr;
|
||||
(void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr),
|
||||
sizeof(struct in_addr));
|
||||
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
||||
/*
|
||||
* Let ip_intr's mcast routing check handle mcast pkts
|
||||
*/
|
||||
forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
|
||||
break;
|
||||
|
||||
case IPOPT_RR:
|
||||
#ifdef IPSTEALTH
|
||||
if (ipstealth && pass == 0)
|
||||
break;
|
||||
#endif
|
||||
if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
|
||||
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
|
||||
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
/*
|
||||
* If no space remains, ignore.
|
||||
*/
|
||||
off--; /* 0 origin */
|
||||
if (off > optlen - (int)sizeof(struct in_addr))
|
||||
break;
|
||||
(void)memcpy(&ipaddr.sin_addr, &ip->ip_dst,
|
||||
sizeof(ipaddr.sin_addr));
|
||||
/*
|
||||
* locate outgoing interface; if we're the destination,
|
||||
* use the incoming interface (should be same).
|
||||
*/
|
||||
if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
|
||||
(ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
|
||||
type = ICMP_UNREACH;
|
||||
code = ICMP_UNREACH_HOST;
|
||||
goto bad;
|
||||
}
|
||||
(void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr),
|
||||
sizeof(struct in_addr));
|
||||
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
||||
break;
|
||||
|
||||
case IPOPT_TS:
|
||||
#ifdef IPSTEALTH
|
||||
if (ipstealth && pass == 0)
|
||||
break;
|
||||
#endif
|
||||
code = cp - (u_char *)ip;
|
||||
if (optlen < 4 || optlen > 40) {
|
||||
code = &cp[IPOPT_OLEN] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
if ((off = cp[IPOPT_OFFSET]) < 5) {
|
||||
code = &cp[IPOPT_OLEN] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
if (off > optlen - (int)sizeof(int32_t)) {
|
||||
cp[IPOPT_OFFSET + 1] += (1 << 4);
|
||||
if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
|
||||
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
break;
|
||||
}
|
||||
off--; /* 0 origin */
|
||||
sin = (struct in_addr *)(cp + off);
|
||||
switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
|
||||
|
||||
case IPOPT_TS_TSONLY:
|
||||
break;
|
||||
|
||||
case IPOPT_TS_TSANDADDR:
|
||||
if (off + sizeof(n_time) +
|
||||
sizeof(struct in_addr) > optlen) {
|
||||
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
ipaddr.sin_addr = dst;
|
||||
ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
|
||||
m->m_pkthdr.rcvif);
|
||||
if (ia == NULL)
|
||||
continue;
|
||||
(void)memcpy(sin, &IA_SIN(ia)->sin_addr,
|
||||
sizeof(struct in_addr));
|
||||
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
||||
off += sizeof(struct in_addr);
|
||||
break;
|
||||
|
||||
case IPOPT_TS_PRESPEC:
|
||||
if (off + sizeof(n_time) +
|
||||
sizeof(struct in_addr) > optlen) {
|
||||
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
(void)memcpy(&ipaddr.sin_addr, sin,
|
||||
sizeof(struct in_addr));
|
||||
if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
|
||||
continue;
|
||||
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
|
||||
off += sizeof(struct in_addr);
|
||||
break;
|
||||
|
||||
default:
|
||||
code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
|
||||
goto bad;
|
||||
}
|
||||
ntime = iptime();
|
||||
(void)memcpy(cp + off, &ntime, sizeof(n_time));
|
||||
cp[IPOPT_OFFSET] += sizeof(n_time);
|
||||
}
|
||||
}
|
||||
if (forward && ipforwarding) {
|
||||
ip_forward(m, 1);
|
||||
return (1);
|
||||
}
|
||||
return (0);
|
||||
bad:
|
||||
icmp_error(m, type, code, 0, 0);
|
||||
ipstat.ips_badoptions++;
|
||||
return (1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Save incoming source route for use in replies,
|
||||
* to be picked up later by ip_srcroute if the receiver is interested.
|
||||
*/
|
||||
static void
|
||||
save_rte(m, option, dst)
|
||||
struct mbuf *m;
|
||||
u_char *option;
|
||||
struct in_addr dst;
|
||||
{
|
||||
unsigned olen;
|
||||
struct ipopt_tag *opts;
|
||||
|
||||
opts = (struct ipopt_tag *)m_tag_get(PACKET_TAG_IPOPTIONS,
|
||||
sizeof(struct ipopt_tag), M_NOWAIT);
|
||||
if (opts == NULL)
|
||||
return;
|
||||
|
||||
olen = option[IPOPT_OLEN];
|
||||
#ifdef DIAGNOSTIC
|
||||
if (ipprintfs)
|
||||
printf("save_rte: olen %d\n", olen);
|
||||
#endif
|
||||
if (olen > sizeof(opts->ip_srcrt) - (1 + sizeof(dst))) {
|
||||
m_tag_free((struct m_tag *)opts);
|
||||
return;
|
||||
}
|
||||
bcopy(option, opts->ip_srcrt.srcopt, olen);
|
||||
opts->ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
|
||||
opts->ip_srcrt.dst = dst;
|
||||
m_tag_prepend(m, (struct m_tag *)opts);
|
||||
}
|
||||
|
||||
/*
|
||||
* Retrieve incoming source route for use in replies,
|
||||
* in the same form used by setsockopt.
|
||||
* The first hop is placed before the options, will be removed later.
|
||||
*/
|
||||
struct mbuf *
|
||||
ip_srcroute(m0)
|
||||
struct mbuf *m0;
|
||||
{
|
||||
register struct in_addr *p, *q;
|
||||
register struct mbuf *m;
|
||||
struct ipopt_tag *opts;
|
||||
|
||||
opts = (struct ipopt_tag *)m_tag_find(m0, PACKET_TAG_IPOPTIONS, NULL);
|
||||
if (opts == NULL)
|
||||
return (NULL);
|
||||
|
||||
if (opts->ip_nhops == 0)
|
||||
return (NULL);
|
||||
m = m_get(M_DONTWAIT, MT_DATA);
|
||||
if (m == NULL)
|
||||
return (NULL);
|
||||
|
||||
#define OPTSIZ (sizeof(opts->ip_srcrt.nop) + sizeof(opts->ip_srcrt.srcopt))
|
||||
|
||||
/* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
|
||||
m->m_len = opts->ip_nhops * sizeof(struct in_addr) +
|
||||
sizeof(struct in_addr) + OPTSIZ;
|
||||
#ifdef DIAGNOSTIC
|
||||
if (ipprintfs)
|
||||
printf("ip_srcroute: nhops %d mlen %d", opts->ip_nhops, m->m_len);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* First save first hop for return route
|
||||
*/
|
||||
p = &(opts->ip_srcrt.route[opts->ip_nhops - 1]);
|
||||
*(mtod(m, struct in_addr *)) = *p--;
|
||||
#ifdef DIAGNOSTIC
|
||||
if (ipprintfs)
|
||||
printf(" hops %lx", (u_long)ntohl(mtod(m, struct in_addr *)->s_addr));
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Copy option fields and padding (nop) to mbuf.
|
||||
*/
|
||||
opts->ip_srcrt.nop = IPOPT_NOP;
|
||||
opts->ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
|
||||
(void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr),
|
||||
&(opts->ip_srcrt.nop), OPTSIZ);
|
||||
q = (struct in_addr *)(mtod(m, caddr_t) +
|
||||
sizeof(struct in_addr) + OPTSIZ);
|
||||
#undef OPTSIZ
|
||||
/*
|
||||
* Record return path as an IP source route,
|
||||
* reversing the path (pointers are now aligned).
|
||||
*/
|
||||
while (p >= opts->ip_srcrt.route) {
|
||||
#ifdef DIAGNOSTIC
|
||||
if (ipprintfs)
|
||||
printf(" %lx", (u_long)ntohl(q->s_addr));
|
||||
#endif
|
||||
*q++ = *p--;
|
||||
}
|
||||
/*
|
||||
* Last hop goes to final destination.
|
||||
*/
|
||||
*q = opts->ip_srcrt.dst;
|
||||
#ifdef DIAGNOSTIC
|
||||
if (ipprintfs)
|
||||
printf(" %lx\n", (u_long)ntohl(q->s_addr));
|
||||
#endif
|
||||
m_tag_delete(m0, (struct m_tag *)opts);
|
||||
return (m);
|
||||
}
|
||||
|
||||
/*
|
||||
* Strip out IP options, at higher
|
||||
* level protocol in the kernel.
|
||||
* Second argument is buffer to which options
|
||||
* will be moved, and return value is their length.
|
||||
* XXX should be deleted; last arg currently ignored.
|
||||
*/
|
||||
void
|
||||
ip_stripoptions(m, mopt)
|
||||
register struct mbuf *m;
|
||||
struct mbuf *mopt;
|
||||
{
|
||||
register int i;
|
||||
struct ip *ip = mtod(m, struct ip *);
|
||||
register caddr_t opts;
|
||||
int olen;
|
||||
|
||||
olen = (ip->ip_hl << 2) - sizeof (struct ip);
|
||||
opts = (caddr_t)(ip + 1);
|
||||
i = m->m_len - (sizeof (struct ip) + olen);
|
||||
bcopy(opts + olen, opts, (unsigned)i);
|
||||
m->m_len -= olen;
|
||||
if (m->m_flags & M_PKTHDR)
|
||||
m->m_pkthdr.len -= olen;
|
||||
ip->ip_v = IPVERSION;
|
||||
ip->ip_hl = sizeof(struct ip) >> 2;
|
||||
}
|
||||
|
||||
/*
|
||||
* Insert IP options into preformed packet.
|
||||
* Adjust IP destination as required for IP source routing,
|
||||
* as indicated by a non-zero in_addr at the start of the options.
|
||||
*
|
||||
* XXX This routine assumes that the packet has no options in place.
|
||||
*/
|
||||
struct mbuf *
|
||||
ip_insertoptions(m, opt, phlen)
|
||||
register struct mbuf *m;
|
||||
struct mbuf *opt;
|
||||
int *phlen;
|
||||
{
|
||||
register struct ipoption *p = mtod(opt, struct ipoption *);
|
||||
struct mbuf *n;
|
||||
register struct ip *ip = mtod(m, struct ip *);
|
||||
unsigned optlen;
|
||||
|
||||
optlen = opt->m_len - sizeof(p->ipopt_dst);
|
||||
if (optlen + ip->ip_len > IP_MAXPACKET) {
|
||||
*phlen = 0;
|
||||
return (m); /* XXX should fail */
|
||||
}
|
||||
if (p->ipopt_dst.s_addr)
|
||||
ip->ip_dst = p->ipopt_dst;
|
||||
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
|
||||
MGETHDR(n, M_DONTWAIT, MT_DATA);
|
||||
if (n == NULL) {
|
||||
*phlen = 0;
|
||||
return (m);
|
||||
}
|
||||
M_MOVE_PKTHDR(n, m);
|
||||
n->m_pkthdr.rcvif = NULL;
|
||||
#ifdef MAC
|
||||
mac_copy_mbuf(m, n);
|
||||
#endif
|
||||
n->m_pkthdr.len += optlen;
|
||||
m->m_len -= sizeof(struct ip);
|
||||
m->m_data += sizeof(struct ip);
|
||||
n->m_next = m;
|
||||
m = n;
|
||||
m->m_len = optlen + sizeof(struct ip);
|
||||
m->m_data += max_linkhdr;
|
||||
bcopy(ip, mtod(m, void *), sizeof(struct ip));
|
||||
} else {
|
||||
m->m_data -= optlen;
|
||||
m->m_len += optlen;
|
||||
m->m_pkthdr.len += optlen;
|
||||
bcopy(ip, mtod(m, void *), sizeof(struct ip));
|
||||
}
|
||||
ip = mtod(m, struct ip *);
|
||||
bcopy(p->ipopt_list, ip + 1, optlen);
|
||||
*phlen = sizeof(struct ip) + optlen;
|
||||
ip->ip_v = IPVERSION;
|
||||
ip->ip_hl = *phlen >> 2;
|
||||
ip->ip_len += optlen;
|
||||
return (m);
|
||||
}
|
||||
|
||||
/*
|
||||
* Copy options from ip to jp,
|
||||
* omitting those not copied during fragmentation.
|
||||
*/
|
||||
int
|
||||
ip_optcopy(ip, jp)
|
||||
struct ip *ip, *jp;
|
||||
{
|
||||
register u_char *cp, *dp;
|
||||
int opt, optlen, cnt;
|
||||
|
||||
cp = (u_char *)(ip + 1);
|
||||
dp = (u_char *)(jp + 1);
|
||||
cnt = (ip->ip_hl << 2) - sizeof (struct ip);
|
||||
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
||||
opt = cp[0];
|
||||
if (opt == IPOPT_EOL)
|
||||
break;
|
||||
if (opt == IPOPT_NOP) {
|
||||
/* Preserve for IP mcast tunnel's LSRR alignment. */
|
||||
*dp++ = IPOPT_NOP;
|
||||
optlen = 1;
|
||||
continue;
|
||||
}
|
||||
|
||||
KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp),
|
||||
("ip_optcopy: malformed ipv4 option"));
|
||||
optlen = cp[IPOPT_OLEN];
|
||||
KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen <= cnt,
|
||||
("ip_optcopy: malformed ipv4 option"));
|
||||
|
||||
/* bogus lengths should have been caught by ip_dooptions */
|
||||
if (optlen > cnt)
|
||||
optlen = cnt;
|
||||
if (IPOPT_COPIED(opt)) {
|
||||
bcopy(cp, dp, optlen);
|
||||
dp += optlen;
|
||||
}
|
||||
}
|
||||
for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
|
||||
*dp++ = IPOPT_EOL;
|
||||
return (optlen);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up IP options in pcb for insertion in output packets.
|
||||
* Store in mbuf with pointer in pcbopt, adding pseudo-option
|
||||
* with destination address if source routed.
|
||||
*/
|
||||
int
|
||||
ip_pcbopts(struct inpcb *inp, int optname, struct mbuf *m)
|
||||
{
|
||||
register int cnt, optlen;
|
||||
register u_char *cp;
|
||||
struct mbuf **pcbopt;
|
||||
u_char opt;
|
||||
|
||||
INP_LOCK_ASSERT(inp);
|
||||
|
||||
pcbopt = &inp->inp_options;
|
||||
|
||||
/* turn off any old options */
|
||||
if (*pcbopt)
|
||||
(void)m_free(*pcbopt);
|
||||
*pcbopt = 0;
|
||||
if (m == NULL || m->m_len == 0) {
|
||||
/*
|
||||
* Only turning off any previous options.
|
||||
*/
|
||||
if (m != NULL)
|
||||
(void)m_free(m);
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (m->m_len % sizeof(int32_t))
|
||||
goto bad;
|
||||
/*
|
||||
* IP first-hop destination address will be stored before
|
||||
* actual options; move other options back
|
||||
* and clear it when none present.
|
||||
*/
|
||||
if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
|
||||
goto bad;
|
||||
cnt = m->m_len;
|
||||
m->m_len += sizeof(struct in_addr);
|
||||
cp = mtod(m, u_char *) + sizeof(struct in_addr);
|
||||
bcopy(mtod(m, void *), cp, (unsigned)cnt);
|
||||
bzero(mtod(m, void *), sizeof(struct in_addr));
|
||||
|
||||
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
||||
opt = cp[IPOPT_OPTVAL];
|
||||
if (opt == IPOPT_EOL)
|
||||
break;
|
||||
if (opt == IPOPT_NOP)
|
||||
optlen = 1;
|
||||
else {
|
||||
if (cnt < IPOPT_OLEN + sizeof(*cp))
|
||||
goto bad;
|
||||
optlen = cp[IPOPT_OLEN];
|
||||
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
|
||||
goto bad;
|
||||
}
|
||||
switch (opt) {
|
||||
|
||||
default:
|
||||
break;
|
||||
|
||||
case IPOPT_LSRR:
|
||||
case IPOPT_SSRR:
|
||||
/*
|
||||
* user process specifies route as:
|
||||
* ->A->B->C->D
|
||||
* D must be our final destination (but we can't
|
||||
* check that since we may not have connected yet).
|
||||
* A is first hop destination, which doesn't appear in
|
||||
* actual IP option, but is stored before the options.
|
||||
*/
|
||||
if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
|
||||
goto bad;
|
||||
m->m_len -= sizeof(struct in_addr);
|
||||
cnt -= sizeof(struct in_addr);
|
||||
optlen -= sizeof(struct in_addr);
|
||||
cp[IPOPT_OLEN] = optlen;
|
||||
/*
|
||||
* Move first hop before start of options.
|
||||
*/
|
||||
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
|
||||
sizeof(struct in_addr));
|
||||
/*
|
||||
* Then copy rest of options back
|
||||
* to close up the deleted entry.
|
||||
*/
|
||||
bcopy((&cp[IPOPT_OFFSET+1] + sizeof(struct in_addr)),
|
||||
&cp[IPOPT_OFFSET+1],
|
||||
(unsigned)cnt - (IPOPT_MINOFF - 1));
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
|
||||
goto bad;
|
||||
*pcbopt = m;
|
||||
return (0);
|
||||
|
||||
bad:
|
||||
(void)m_free(m);
|
||||
return (EINVAL);
|
||||
}
|
74
sys/netinet/ip_options.h
Normal file
74
sys/netinet/ip_options.h
Normal file
@ -0,0 +1,74 @@
|
||||
/*
|
||||
* Copyright (c) 1982, 1986, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
* Copyright (c) 2005
|
||||
* Andre Oppermann, Internet Business Solutions AG. All right 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.
|
||||
* 4. 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.
|
||||
*
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#ifndef _NETINET_IP_OPTIONS_H_
|
||||
#define _NETINET_IP_OPTIONS_H_
|
||||
|
||||
/*
|
||||
* Structure stored in mbuf in inpcb.ip_options
|
||||
* and passed to ip_output when ip options are in use.
|
||||
* The actual length of the options (including ipopt_dst)
|
||||
* is in m_len.
|
||||
*/
|
||||
#define MAX_IPOPTLEN 40
|
||||
|
||||
struct ipoptrt {
|
||||
struct in_addr dst; /* final destination */
|
||||
char nop; /* one NOP to align */
|
||||
char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
|
||||
struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
|
||||
};
|
||||
|
||||
struct ipopt_tag {
|
||||
struct m_tag tag; /* m_tag */
|
||||
int ip_nhops;
|
||||
struct ipoptrt ip_srcrt;
|
||||
};
|
||||
|
||||
struct ipoption {
|
||||
struct in_addr ipopt_dst; /* first-hop dst if source routed */
|
||||
char ipopt_list[MAX_IPOPTLEN]; /* options proper */
|
||||
};
|
||||
|
||||
extern int ip_doopts; /* process or ignore IP options */
|
||||
|
||||
int ip_dooptions(struct mbuf *, int);
|
||||
struct mbuf *
|
||||
ip_insertoptions(struct mbuf *, struct mbuf *, int *);
|
||||
int ip_optcopy(struct ip *, struct ip *);
|
||||
int ip_pcbopts(struct inpcb *, int, struct mbuf *);
|
||||
void ip_stripoptions(struct mbuf *, struct mbuf *);
|
||||
struct mbuf *
|
||||
ip_srcroute(struct mbuf *);
|
||||
|
||||
#endif /* !_NETINET_IP_OPTIONS_H_ */
|
@ -57,6 +57,7 @@
|
||||
#include <netinet/in_pcb.h>
|
||||
#include <netinet/in_var.h>
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
|
||||
#include <machine/in_cksum.h>
|
||||
|
||||
@ -92,16 +93,11 @@ SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
|
||||
&mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
|
||||
#endif
|
||||
|
||||
static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
|
||||
static struct ifnet *ip_multicast_if(struct in_addr *, int *);
|
||||
static void ip_mloopback
|
||||
(struct ifnet *, struct mbuf *, struct sockaddr_in *, int);
|
||||
static int ip_getmoptions(struct inpcb *, struct sockopt *);
|
||||
static int ip_pcbopts(struct inpcb *, int, struct mbuf *);
|
||||
static int ip_setmoptions(struct inpcb *, struct sockopt *);
|
||||
static struct ip_moptions *ip_findmoptions(struct inpcb *inp);
|
||||
|
||||
int ip_optcopy(struct ip *, struct ip *);
|
||||
|
||||
|
||||
extern struct protosw inetsw[];
|
||||
@ -1052,109 +1048,6 @@ in_delayed_cksum(struct mbuf *m)
|
||||
*(u_short *)(m->m_data + offset) = csum;
|
||||
}
|
||||
|
||||
/*
|
||||
* Insert IP options into preformed packet.
|
||||
* Adjust IP destination as required for IP source routing,
|
||||
* as indicated by a non-zero in_addr at the start of the options.
|
||||
*
|
||||
* XXX This routine assumes that the packet has no options in place.
|
||||
*/
|
||||
static struct mbuf *
|
||||
ip_insertoptions(m, opt, phlen)
|
||||
register struct mbuf *m;
|
||||
struct mbuf *opt;
|
||||
int *phlen;
|
||||
{
|
||||
register struct ipoption *p = mtod(opt, struct ipoption *);
|
||||
struct mbuf *n;
|
||||
register struct ip *ip = mtod(m, struct ip *);
|
||||
unsigned optlen;
|
||||
|
||||
optlen = opt->m_len - sizeof(p->ipopt_dst);
|
||||
if (optlen + ip->ip_len > IP_MAXPACKET) {
|
||||
*phlen = 0;
|
||||
return (m); /* XXX should fail */
|
||||
}
|
||||
if (p->ipopt_dst.s_addr)
|
||||
ip->ip_dst = p->ipopt_dst;
|
||||
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
|
||||
MGETHDR(n, M_DONTWAIT, MT_DATA);
|
||||
if (n == NULL) {
|
||||
*phlen = 0;
|
||||
return (m);
|
||||
}
|
||||
M_MOVE_PKTHDR(n, m);
|
||||
n->m_pkthdr.rcvif = NULL;
|
||||
#ifdef MAC
|
||||
mac_copy_mbuf(m, n);
|
||||
#endif
|
||||
n->m_pkthdr.len += optlen;
|
||||
m->m_len -= sizeof(struct ip);
|
||||
m->m_data += sizeof(struct ip);
|
||||
n->m_next = m;
|
||||
m = n;
|
||||
m->m_len = optlen + sizeof(struct ip);
|
||||
m->m_data += max_linkhdr;
|
||||
bcopy(ip, mtod(m, void *), sizeof(struct ip));
|
||||
} else {
|
||||
m->m_data -= optlen;
|
||||
m->m_len += optlen;
|
||||
m->m_pkthdr.len += optlen;
|
||||
bcopy(ip, mtod(m, void *), sizeof(struct ip));
|
||||
}
|
||||
ip = mtod(m, struct ip *);
|
||||
bcopy(p->ipopt_list, ip + 1, optlen);
|
||||
*phlen = sizeof(struct ip) + optlen;
|
||||
ip->ip_v = IPVERSION;
|
||||
ip->ip_hl = *phlen >> 2;
|
||||
ip->ip_len += optlen;
|
||||
return (m);
|
||||
}
|
||||
|
||||
/*
|
||||
* Copy options from ip to jp,
|
||||
* omitting those not copied during fragmentation.
|
||||
*/
|
||||
int
|
||||
ip_optcopy(ip, jp)
|
||||
struct ip *ip, *jp;
|
||||
{
|
||||
register u_char *cp, *dp;
|
||||
int opt, optlen, cnt;
|
||||
|
||||
cp = (u_char *)(ip + 1);
|
||||
dp = (u_char *)(jp + 1);
|
||||
cnt = (ip->ip_hl << 2) - sizeof (struct ip);
|
||||
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
||||
opt = cp[0];
|
||||
if (opt == IPOPT_EOL)
|
||||
break;
|
||||
if (opt == IPOPT_NOP) {
|
||||
/* Preserve for IP mcast tunnel's LSRR alignment. */
|
||||
*dp++ = IPOPT_NOP;
|
||||
optlen = 1;
|
||||
continue;
|
||||
}
|
||||
|
||||
KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp),
|
||||
("ip_optcopy: malformed ipv4 option"));
|
||||
optlen = cp[IPOPT_OLEN];
|
||||
KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen <= cnt,
|
||||
("ip_optcopy: malformed ipv4 option"));
|
||||
|
||||
/* bogus lengths should have been caught by ip_dooptions */
|
||||
if (optlen > cnt)
|
||||
optlen = cnt;
|
||||
if (IPOPT_COPIED(opt)) {
|
||||
bcopy(cp, dp, optlen);
|
||||
dp += optlen;
|
||||
}
|
||||
}
|
||||
for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
|
||||
*dp++ = IPOPT_EOL;
|
||||
return (optlen);
|
||||
}
|
||||
|
||||
/*
|
||||
* IP socket option processing.
|
||||
*/
|
||||
@ -1464,110 +1357,6 @@ ip_ctloutput(so, sopt)
|
||||
return (error);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up IP options in pcb for insertion in output packets.
|
||||
* Store in mbuf with pointer in pcbopt, adding pseudo-option
|
||||
* with destination address if source routed.
|
||||
*/
|
||||
static int
|
||||
ip_pcbopts(struct inpcb *inp, int optname, struct mbuf *m)
|
||||
{
|
||||
register int cnt, optlen;
|
||||
register u_char *cp;
|
||||
struct mbuf **pcbopt;
|
||||
u_char opt;
|
||||
|
||||
INP_LOCK_ASSERT(inp);
|
||||
|
||||
pcbopt = &inp->inp_options;
|
||||
|
||||
/* turn off any old options */
|
||||
if (*pcbopt)
|
||||
(void)m_free(*pcbopt);
|
||||
*pcbopt = 0;
|
||||
if (m == NULL || m->m_len == 0) {
|
||||
/*
|
||||
* Only turning off any previous options.
|
||||
*/
|
||||
if (m != NULL)
|
||||
(void)m_free(m);
|
||||
return (0);
|
||||
}
|
||||
|
||||
if (m->m_len % sizeof(int32_t))
|
||||
goto bad;
|
||||
/*
|
||||
* IP first-hop destination address will be stored before
|
||||
* actual options; move other options back
|
||||
* and clear it when none present.
|
||||
*/
|
||||
if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
|
||||
goto bad;
|
||||
cnt = m->m_len;
|
||||
m->m_len += sizeof(struct in_addr);
|
||||
cp = mtod(m, u_char *) + sizeof(struct in_addr);
|
||||
bcopy(mtod(m, void *), cp, (unsigned)cnt);
|
||||
bzero(mtod(m, void *), sizeof(struct in_addr));
|
||||
|
||||
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
||||
opt = cp[IPOPT_OPTVAL];
|
||||
if (opt == IPOPT_EOL)
|
||||
break;
|
||||
if (opt == IPOPT_NOP)
|
||||
optlen = 1;
|
||||
else {
|
||||
if (cnt < IPOPT_OLEN + sizeof(*cp))
|
||||
goto bad;
|
||||
optlen = cp[IPOPT_OLEN];
|
||||
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
|
||||
goto bad;
|
||||
}
|
||||
switch (opt) {
|
||||
|
||||
default:
|
||||
break;
|
||||
|
||||
case IPOPT_LSRR:
|
||||
case IPOPT_SSRR:
|
||||
/*
|
||||
* user process specifies route as:
|
||||
* ->A->B->C->D
|
||||
* D must be our final destination (but we can't
|
||||
* check that since we may not have connected yet).
|
||||
* A is first hop destination, which doesn't appear in
|
||||
* actual IP option, but is stored before the options.
|
||||
*/
|
||||
if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
|
||||
goto bad;
|
||||
m->m_len -= sizeof(struct in_addr);
|
||||
cnt -= sizeof(struct in_addr);
|
||||
optlen -= sizeof(struct in_addr);
|
||||
cp[IPOPT_OLEN] = optlen;
|
||||
/*
|
||||
* Move first hop before start of options.
|
||||
*/
|
||||
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
|
||||
sizeof(struct in_addr));
|
||||
/*
|
||||
* Then copy rest of options back
|
||||
* to close up the deleted entry.
|
||||
*/
|
||||
bcopy((&cp[IPOPT_OFFSET+1] + sizeof(struct in_addr)),
|
||||
&cp[IPOPT_OFFSET+1],
|
||||
(unsigned)cnt - (IPOPT_MINOFF - 1));
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
|
||||
goto bad;
|
||||
*pcbopt = m;
|
||||
return (0);
|
||||
|
||||
bad:
|
||||
(void)m_free(m);
|
||||
return (EINVAL);
|
||||
}
|
||||
|
||||
/*
|
||||
* XXX
|
||||
* The whole multicast option thing needs to be re-thought.
|
||||
|
@ -65,19 +65,6 @@ struct ipq {
|
||||
};
|
||||
#endif /* _KERNEL */
|
||||
|
||||
/*
|
||||
* Structure stored in mbuf in inpcb.ip_options
|
||||
* and passed to ip_output when ip options are in use.
|
||||
* The actual length of the options (including ipopt_dst)
|
||||
* is in m_len.
|
||||
*/
|
||||
#define MAX_IPOPTLEN 40
|
||||
|
||||
struct ipoption {
|
||||
struct in_addr ipopt_dst; /* first-hop dst if source routed */
|
||||
char ipopt_list[MAX_IPOPTLEN]; /* options proper */
|
||||
};
|
||||
|
||||
/*
|
||||
* Structure attached to inpcb.ip_moptions and
|
||||
* passed to ip_output when IP multicast options are in use.
|
||||
@ -151,7 +138,6 @@ extern struct ipstat ipstat;
|
||||
extern u_short ip_id; /* ip packet ctr, for ids */
|
||||
extern int ip_defttl; /* default IP ttl */
|
||||
extern int ipforwarding; /* ip forwarding */
|
||||
extern int ip_doopts; /* process or ignore IP options */
|
||||
#ifdef IPSTEALTH
|
||||
extern int ipstealth; /* stealth forwarding */
|
||||
#endif
|
||||
@ -169,6 +155,7 @@ void ip_fini(void *xtp);
|
||||
int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
|
||||
u_long if_hwassist_flags, int sw_csum);
|
||||
void ip_freemoptions(struct ip_moptions *);
|
||||
void ip_forward(struct mbuf *m, int srcrt);
|
||||
void ip_init(void);
|
||||
extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
|
||||
struct ip_moptions *);
|
||||
@ -184,9 +171,6 @@ struct in_ifaddr *
|
||||
void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
|
||||
struct mbuf *);
|
||||
void ip_slowtimo(void);
|
||||
struct mbuf *
|
||||
ip_srcroute(struct mbuf *);
|
||||
void ip_stripoptions(struct mbuf *, struct mbuf *);
|
||||
u_int16_t ip_randomid(void);
|
||||
int rip_ctloutput(struct socket *, struct sockopt *);
|
||||
void rip_ctlinput(int, struct sockaddr *, void *);
|
||||
|
@ -68,6 +68,7 @@
|
||||
#include <netinet/ip_icmp.h> /* for ICMP_BANDLIM */
|
||||
#include <netinet/icmp_var.h> /* for ICMP_BANDLIM */
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
#include <netinet/ip6.h>
|
||||
#include <netinet/icmp6.h>
|
||||
#include <netinet6/in6_pcb.h>
|
||||
|
@ -57,6 +57,7 @@
|
||||
#include <netinet/ip.h>
|
||||
#include <netinet/in_pcb.h>
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
#ifdef INET6
|
||||
#include <netinet6/in6_pcb.h>
|
||||
#include <netinet/ip6.h>
|
||||
|
@ -68,6 +68,7 @@
|
||||
#include <netinet/ip_icmp.h> /* for ICMP_BANDLIM */
|
||||
#include <netinet/icmp_var.h> /* for ICMP_BANDLIM */
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
#include <netinet/ip6.h>
|
||||
#include <netinet/icmp6.h>
|
||||
#include <netinet6/in6_pcb.h>
|
||||
|
@ -60,6 +60,7 @@
|
||||
#include <netinet/in_var.h>
|
||||
#include <netinet/in_pcb.h>
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
#ifdef INET6
|
||||
#include <netinet/ip6.h>
|
||||
#include <netinet/icmp6.h>
|
||||
|
@ -68,6 +68,7 @@
|
||||
#include <netinet/ip_icmp.h>
|
||||
#include <netinet/icmp_var.h>
|
||||
#include <netinet/ip_var.h>
|
||||
#include <netinet/ip_options.h>
|
||||
#ifdef INET6
|
||||
#include <netinet6/ip6_var.h>
|
||||
#endif
|
||||
|
Loading…
Reference in New Issue
Block a user