Differential D8877 Diff 23172 sys/netinet/tcp_input.c

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sys/netinet/tcp_input.c

Show First 20 Lines • Show All 599 Lines • ▼ Show 20 Lines	tcp_input(struct mbuf *mp, int offp, int proto)
struct ip *ip = NULL;		struct ip *ip = NULL;
struct inpcb *inp = NULL;		struct inpcb *inp = NULL;
struct tcpcb *tp = NULL;		struct tcpcb *tp = NULL;
struct socket *so = NULL;		struct socket *so = NULL;
u_char *optp = NULL;		u_char *optp = NULL;
int off0;		int off0;
int optlen = 0;		int optlen = 0;
#ifdef INET		#ifdef INET
		struct sockaddr_in next_hop;
int len;		int len;
#endif		#endif
int tlen = 0, off;		int tlen = 0, off;
int drop_hdrlen;		int drop_hdrlen;
int thflags;		int thflags;
int rstreason = 0; /* For badport_bandlim accounting purposes */		int rstreason = 0; /* For badport_bandlim accounting purposes */
#ifdef TCP_SIGNATURE		#ifdef TCP_SIGNATURE
uint8_t sig_checked = 0;		uint8_t sig_checked = 0;
#endif		#endif
uint8_t iptos;		uint8_t iptos;
struct m_tag *fwd_tag = NULL;
#ifdef INET6		#ifdef INET6
		struct sockaddr_in6 next_hop6;
struct ip6_hdr *ip6 = NULL;		struct ip6_hdr *ip6 = NULL;
int isipv6;		int isipv6;
#else		#else
const void *ip6 = NULL;		const void *ip6 = NULL;
#endif /* INET6 */		#endif /* INET6 */
struct tcpopt to; /* options in this segment */		struct tcpopt to; /* options in this segment */
char s = NULL; / address and port logging */		char s = NULL; / address and port logging */
int ti_locked;		int ti_locked;
▲ Show 20 Lines • Show All 177 Lines • ▼ Show 20 Lines	#endif
* connection in TIMEWAIT and SYNs not targeting a listening socket.		* connection in TIMEWAIT and SYNs not targeting a listening socket.
*/		*/
if ((thflags & (TH_FIN \| TH_RST)) != 0) {		if ((thflags & (TH_FIN \| TH_RST)) != 0) {
INP_INFO_RLOCK(&V_tcbinfo);		INP_INFO_RLOCK(&V_tcbinfo);
ti_locked = TI_RLOCKED;		ti_locked = TI_RLOCKED;
} else		} else
ti_locked = TI_UNLOCKED;		ti_locked = TI_UNLOCKED;

/*
* Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
*/
if (
#ifdef INET6
(isipv6 && (m->m_flags & M_IP6_NEXTHOP))
#ifdef INET
\|\| (!isipv6 && (m->m_flags & M_IP_NEXTHOP))
#endif
#endif
#if defined(INET) && !defined(INET6)
(m->m_flags & M_IP_NEXTHOP)
#endif
)
fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);

findpcb:		findpcb:
#ifdef INVARIANTS		#ifdef INVARIANTS
if (ti_locked == TI_RLOCKED) {		if (ti_locked == TI_RLOCKED) {
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);		INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
} else {		} else {
INP_INFO_UNLOCK_ASSERT(&V_tcbinfo);		INP_INFO_UNLOCK_ASSERT(&V_tcbinfo);
}		}
#endif		#endif
#ifdef INET6		#ifdef INET6
if (isipv6 && fwd_tag != NULL) {
struct sockaddr_in6 *next_hop6;

next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
/*		/*
		* Grab info from IP forward tag prepended to the chain.
		*/
		if (isipv6 && IP6_HAS_NEXTHOP(m) &&
		!ip6_get_fwdtag(m, &next_hop6, NULL)) {
		/*
* Transparently forwarded. Pretend to be the destination.		* Transparently forwarded. Pretend to be the destination.
* Already got one like this?		* Already got one like this?
*/		*/
inp = in6_pcblookup_mbuf(&V_tcbinfo,		inp = in6_pcblookup_mbuf(&V_tcbinfo,
&ip6->ip6_src, th->th_sport, &ip6->ip6_dst, th->th_dport,		&ip6->ip6_src, th->th_sport, &ip6->ip6_dst, th->th_dport,
INPLOOKUP_WLOCKPCB, m->m_pkthdr.rcvif, m);		INPLOOKUP_WLOCKPCB, m->m_pkthdr.rcvif, m);
if (!inp) {		if (!inp) {
/*		/*
* It's new. Try to find the ambushing socket.		* It's new. Try to find the ambushing socket.
* Because we've rewritten the destination address,		* Because we've rewritten the destination address,
* any hardware-generated hash is ignored.		* any hardware-generated hash is ignored.
*/		*/
inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_src,		inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_src,
th->th_sport, &next_hop6->sin6_addr,		th->th_sport, &next_hop6.sin6_addr,
next_hop6->sin6_port ? ntohs(next_hop6->sin6_port) :		next_hop6.sin6_port ? ntohs(next_hop6.sin6_port) :
th->th_dport, INPLOOKUP_WILDCARD \|		th->th_dport, INPLOOKUP_WILDCARD \|
INPLOOKUP_WLOCKPCB, m->m_pkthdr.rcvif);		INPLOOKUP_WLOCKPCB, m->m_pkthdr.rcvif);
}		}
		/* Remove the tag from the packet. We don't need it anymore. */
		ip6_flush_fwdtag(m);
} else if (isipv6) {		} else if (isipv6) {
inp = in6_pcblookup_mbuf(&V_tcbinfo, &ip6->ip6_src,		inp = in6_pcblookup_mbuf(&V_tcbinfo, &ip6->ip6_src,
th->th_sport, &ip6->ip6_dst, th->th_dport,		th->th_sport, &ip6->ip6_dst, th->th_dport,
INPLOOKUP_WILDCARD \| INPLOOKUP_WLOCKPCB,		INPLOOKUP_WILDCARD \| INPLOOKUP_WLOCKPCB,
m->m_pkthdr.rcvif, m);		m->m_pkthdr.rcvif, m);
}		}
#endif /* INET6 */		#endif /* INET6 */
#if defined(INET6) && defined(INET)		#if defined(INET6) && defined(INET)
else		else
#endif		#endif
#ifdef INET		#ifdef INET
if (fwd_tag != NULL) {
struct sockaddr_in *next_hop;

next_hop = (struct sockaddr_in *)(fwd_tag+1);
/*		/*
		* Grab info from IP forward tag prepended to the chain.
		*/
		if (IP_HAS_NEXTHOP(m) && !ip_get_fwdtag(m, &next_hop, NULL)) {
		/*
* Transparently forwarded. Pretend to be the destination.		* Transparently forwarded. Pretend to be the destination.
* already got one like this?		* already got one like this?
*/		*/
inp = in_pcblookup_mbuf(&V_tcbinfo, ip->ip_src, th->th_sport,		inp = in_pcblookup_mbuf(&V_tcbinfo, ip->ip_src, th->th_sport,
ip->ip_dst, th->th_dport, INPLOOKUP_WLOCKPCB,		ip->ip_dst, th->th_dport, INPLOOKUP_WLOCKPCB,
m->m_pkthdr.rcvif, m);		m->m_pkthdr.rcvif, m);
if (!inp) {		if (!inp) {
/*		/*
* It's new. Try to find the ambushing socket.		* It's new. Try to find the ambushing socket.
* Because we've rewritten the destination address,		* Because we've rewritten the destination address,
* any hardware-generated hash is ignored.		* any hardware-generated hash is ignored.
*/		*/
inp = in_pcblookup(&V_tcbinfo, ip->ip_src,		inp = in_pcblookup(&V_tcbinfo, ip->ip_src,
th->th_sport, next_hop->sin_addr,		th->th_sport, next_hop.sin_addr,
next_hop->sin_port ? ntohs(next_hop->sin_port) :		next_hop.sin_port ? ntohs(next_hop.sin_port) :
th->th_dport, INPLOOKUP_WILDCARD \|		th->th_dport, INPLOOKUP_WILDCARD \|
INPLOOKUP_WLOCKPCB, m->m_pkthdr.rcvif);		INPLOOKUP_WLOCKPCB, m->m_pkthdr.rcvif);
}		}
		/* Remove the tag from the packet. We don't need it anymore. */
		ip_flush_fwdtag(m);
} else		} else
inp = in_pcblookup_mbuf(&V_tcbinfo, ip->ip_src,		inp = in_pcblookup_mbuf(&V_tcbinfo, ip->ip_src,
th->th_sport, ip->ip_dst, th->th_dport,		th->th_sport, ip->ip_dst, th->th_dport,
INPLOOKUP_WILDCARD \| INPLOOKUP_WLOCKPCB,		INPLOOKUP_WILDCARD \| INPLOOKUP_WLOCKPCB,
m->m_pkthdr.rcvif, m);		m->m_pkthdr.rcvif, m);
#endif /* INET */		#endif /* INET */

/*		/*
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