Differential D31595 Diff 93857 sys/netinet/ip_fastfwd.c

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sys/netinet/ip_fastfwd.c

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* 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 nhop_object *nh = NULL;		struct nhop_object *nh = NULL;
struct sockaddr_in dst;		struct route ro;
		struct sockaddr_in *dst;
		const struct sockaddr *gw;
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;
struct mbuf *mcopy = NULL;		struct mbuf *mcopy = NULL;
struct in_addr redest;		struct in_addr redest;
/*		/*
* Are we active and forwarding packets?		* Are we active and forwarding packets?
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passout:		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(&ro, sizeof(ro));
dst.sin_family = AF_INET;		dst = (struct sockaddr_in *)&ro.ro_dst;
dst.sin_len = sizeof(dst);		dst->sin_family = AF_INET;
if (nh->nh_flags & NHF_GATEWAY)		dst->sin_len = sizeof(*dst);
dst.sin_addr = nh->gw4_sa.sin_addr;		dst->sin_addr = dest;
else		if (nh->nh_flags & NHF_GATEWAY) {
dst.sin_addr = dest;		gw = &nh->gw_sa;
		ro.ro_flags \|= RT_HAS_GW;
		} else
		gw = (const struct sockaddr *)dst;

/*		/*
* Handle redirect case.		* Handle redirect case.
*/		*/
redest.s_addr = 0;		redest.s_addr = 0;
if (V_ipsendredirects && (nh->nh_ifp == m->m_pkthdr.rcvif))		if (V_ipsendredirects && (nh->nh_ifp == m->m_pkthdr.rcvif) &&
		gw->sa_family == AF_INET)
mcopy = ip_redir_alloc(m, nh, ip, &redest.s_addr);		mcopy = ip_redir_alloc(m, nh, ip, &redest.s_addr);

/*		/*
* 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, gw, &ro);
(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);
Show All 18 Lines	if (ip_off & IP_DF) {
* 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);
error = (*nh->nh_ifp->if_output)(nh->nh_ifp, m,		error = (*nh->nh_ifp->if_output)(nh->nh_ifp, m,
(struct sockaddr *)&dst, NULL);		gw, &ro);
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;
m_freem(m);		m_freem(m);
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