Differential D24245 Diff 70507 sys/netinet/ip_fastfwd.c

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sys/netinet/ip_fastfwd.c

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#include <sys/sysctl.h>		#include <sys/sysctl.h>

#include <net/if.h>		#include <net/if.h>
#include <net/if_types.h>		#include <net/if_types.h>
#include <net/if_var.h>		#include <net/if_var.h>
#include <net/if_dl.h>		#include <net/if_dl.h>
#include <net/pfil.h>		#include <net/pfil.h>
#include <net/route.h>		#include <net/route.h>
		#include <net/route/nhop.h>
#include <net/vnet.h>		#include <net/vnet.h>

#include <netinet/in.h>		#include <netinet/in.h>
#include <netinet/in_fib.h>		#include <netinet/in_fib.h>
#include <netinet/in_kdtrace.h>		#include <netinet/in_kdtrace.h>
#include <netinet/in_systm.h>		#include <netinet/in_systm.h>
#include <netinet/in_var.h>		#include <netinet/in_var.h>
#include <netinet/ip.h>		#include <netinet/ip.h>
#include <netinet/ip_var.h>		#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>		#include <netinet/ip_icmp.h>
#include <netinet/ip_options.h>		#include <netinet/ip_options.h>

#include <machine/in_cksum.h>		#include <machine/in_cksum.h>

static int		static int
ip_findroute(struct nhop4_basic pnh, struct in_addr dest, struct mbuf m)		ip_findroute(struct nhop_object *pnh, struct in_addr dest, struct mbuf m)
{		{
		struct nhop_object *nh;

bzero(pnh, sizeof(*pnh));		nh = fib4_lookup(M_GETFIB(m), dest, 0, NHR_NONE,
if (fib4_lookup_nh_basic(M_GETFIB(m), dest, 0, 0, pnh) != 0) {		m->m_pkthdr.flowid);
		if (nh == NULL) {
IPSTAT_INC(ips_noroute);		IPSTAT_INC(ips_noroute);
IPSTAT_INC(ips_cantforward);		IPSTAT_INC(ips_cantforward);
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);		icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
return (EHOSTUNREACH);		return (EHOSTUNREACH);
}		}
/*		/*
* Drop blackholed traffic and directed broadcasts.		* Drop blackholed traffic and directed broadcasts.
*/		*/
if ((pnh->nh_flags & (NHF_BLACKHOLE \| NHF_BROADCAST)) != 0) {		if ((nh->nh_flags & (NHF_BLACKHOLE \| NHF_BROADCAST)) != 0) {
IPSTAT_INC(ips_cantforward);		IPSTAT_INC(ips_cantforward);
m_freem(m);		m_freem(m);
return (EHOSTUNREACH);		return (EHOSTUNREACH);
}		}

if (pnh->nh_flags & NHF_REJECT) {		if (nh->nh_flags & NHF_REJECT) {
IPSTAT_INC(ips_cantforward);		IPSTAT_INC(ips_cantforward);
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);		icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
return (EHOSTUNREACH);		return (EHOSTUNREACH);
}		}

		*pnh = nh;

return (0);		return (0);
}		}

/*		/*
* Try to forward a packet based on the destination address.		* Try to forward a packet based on the destination address.
* This is a fast path optimized for the plain forwarding case.		* This is a fast path optimized for the plain forwarding case.
* If the packet is handled (and consumed) here then we return NULL;		* If the packet is handled (and consumed) here then we return NULL;
* otherwise mbuf is returned and the packet should be delivered		* otherwise mbuf is returned and the packet should be delivered
* to ip_input for full processing.		* to ip_input for full processing.
*/		*/
struct mbuf *		struct mbuf *
ip_tryforward(struct mbuf *m)		ip_tryforward(struct mbuf *m)
{		{
struct ip *ip;		struct ip *ip;
struct mbuf *m0 = NULL;		struct mbuf *m0 = NULL;
struct nhop4_basic nh;		struct nhop_object *nh;
struct sockaddr_in dst;		struct sockaddr_in dst;
struct in_addr dest, odest, rtdest;		struct in_addr dest, odest, rtdest;
uint16_t ip_len, ip_off;		uint16_t ip_len, ip_off;
int error = 0;		int error = 0;
struct m_tag *fwd_tag = NULL;		struct m_tag *fwd_tag = NULL;

/*		/*
* Are we active and forwarding packets?		* Are we active and forwarding packets?
▲ Show 20 Lines • Show All 155 Lines • ▼ Show 20 Lines	#endif
rtdest.s_addr = dest.s_addr;		rtdest.s_addr = dest.s_addr;

/*		/*
* Step 5: outgoing firewall packet processing		* Step 5: outgoing firewall packet processing
*/		*/
if (!PFIL_HOOKED_OUT(V_inet_pfil_head))		if (!PFIL_HOOKED_OUT(V_inet_pfil_head))
goto passout;		goto passout;

if (pfil_run_hooks(V_inet_pfil_head, &m, nh.nh_ifp,		if (pfil_run_hooks(V_inet_pfil_head, &m, nh->nh_ifp,
PFIL_OUT \| PFIL_FWD, NULL) != PFIL_PASS)		PFIL_OUT \| PFIL_FWD, NULL) != PFIL_PASS)
goto drop;		goto drop;

M_ASSERTVALID(m);		M_ASSERTVALID(m);
M_ASSERTPKTHDR(m);		M_ASSERTPKTHDR(m);

ip = mtod(m, struct ip *);		ip = mtod(m, struct ip *);
dest.s_addr = ip->ip_dst.s_addr;		dest.s_addr = ip->ip_dst.s_addr;
Show All 36 Lines	passout:
* Step 6: send off the packet		* Step 6: send off the packet
*/		*/
ip_len = ntohs(ip->ip_len);		ip_len = ntohs(ip->ip_len);
ip_off = ntohs(ip->ip_off);		ip_off = ntohs(ip->ip_off);

bzero(&dst, sizeof(dst));		bzero(&dst, sizeof(dst));
dst.sin_family = AF_INET;		dst.sin_family = AF_INET;
dst.sin_len = sizeof(dst);		dst.sin_len = sizeof(dst);
dst.sin_addr = nh.nh_addr;		if (nh->nh_flags & NHF_GATEWAY)
		dst.sin_addr = nh->gw4_sa.sin_addr;
		else
		dst.sin_addr = dest;

/*		/*
* Check if packet fits MTU or if hardware will fragment for us		* Check if packet fits MTU or if hardware will fragment for us
*/		*/
if (ip_len <= nh.nh_mtu) {		if (ip_len <= nh->nh_mtu) {
/*		/*
* Avoid confusing lower layers.		* Avoid confusing lower layers.
*/		*/
m_clrprotoflags(m);		m_clrprotoflags(m);
/*		/*
* Send off the packet via outgoing interface		* Send off the packet via outgoing interface
*/		*/
IP_PROBE(send, NULL, NULL, ip, nh.nh_ifp, ip, NULL);		IP_PROBE(send, NULL, NULL, ip, nh->nh_ifp, ip, NULL);
error = (*nh.nh_ifp->if_output)(nh.nh_ifp, m,		error = (*nh->nh_ifp->if_output)(nh->nh_ifp, m,
(struct sockaddr *)&dst, NULL);		(struct sockaddr *)&dst, NULL);
} else {		} else {
/*		/*
* Handle EMSGSIZE with icmp reply needfrag for TCP MTU discovery		* Handle EMSGSIZE with icmp reply needfrag for TCP MTU discovery
*/		*/
if (ip_off & IP_DF) {		if (ip_off & IP_DF) {
IPSTAT_INC(ips_cantfrag);		IPSTAT_INC(ips_cantfrag);
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,		icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
0, nh.nh_mtu);		0, nh->nh_mtu);
goto consumed;		goto consumed;
} else {		} else {
/*		/*
* We have to fragment the packet		* We have to fragment the packet
*/		*/
m->m_pkthdr.csum_flags \|= CSUM_IP;		m->m_pkthdr.csum_flags \|= CSUM_IP;
if (ip_fragment(ip, &m, nh.nh_mtu,		if (ip_fragment(ip, &m, nh->nh_mtu,
nh.nh_ifp->if_hwassist) != 0)		nh->nh_ifp->if_hwassist) != 0)
goto drop;		goto drop;
KASSERT(m != NULL, ("null mbuf and no error"));		KASSERT(m != NULL, ("null mbuf and no error"));
/*		/*
* Send off the fragments via outgoing interface		* Send off the fragments via outgoing interface
*/		*/
error = 0;		error = 0;
do {		do {
m0 = m->m_nextpkt;		m0 = m->m_nextpkt;
m->m_nextpkt = NULL;		m->m_nextpkt = NULL;
/*		/*
* Avoid confusing lower layers.		* Avoid confusing lower layers.
*/		*/
m_clrprotoflags(m);		m_clrprotoflags(m);

IP_PROBE(send, NULL, NULL,		IP_PROBE(send, NULL, NULL,
mtod(m, struct ip *), nh.nh_ifp,		mtod(m, struct ip *), nh->nh_ifp,
mtod(m, struct ip *), NULL);		mtod(m, struct ip *), NULL);
/* XXX: we can use cached route here */		error = (*nh->nh_ifp->if_output)(nh->nh_ifp, m,
error = (*nh.nh_ifp->if_output)(nh.nh_ifp, m,
(struct sockaddr *)&dst, NULL);		(struct sockaddr *)&dst, NULL);
if (error)		if (error)
break;		break;
} while ((m = m0) != NULL);		} while ((m = m0) != NULL);
if (error) {		if (error) {
/* Reclaim remaining fragments */		/* Reclaim remaining fragments */
for (m = m0; m; m = m0) {		for (m = m0; m; m = m0) {
m0 = m->m_nextpkt;		m0 = m->m_nextpkt;
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