Differential D8877 Diff 23266 sys/netinet/ip_output.c

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sys/netinet/ip_output.c

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extern int in_mcast_loop;		extern int in_mcast_loop;
extern struct protosw inetsw[];		extern struct protosw inetsw[];

static inline int		static inline int
ip_output_pfil(struct mbuf *mp, struct ifnet ifp, struct inpcb *inp,		ip_output_pfil(struct mbuf *mp, struct ifnet ifp, struct inpcb *inp,
struct sockaddr_in dst, int fibnum, int *error)		struct sockaddr_in dst, int fibnum, int *error)
{		{
struct m_tag *fwd_tag = NULL;
struct mbuf *m;		struct mbuf *m;
struct in_addr odst;		struct in_addr odst;
struct ip *ip;		struct ip *ip;

m = *mp;		m = *mp;
ip = mtod(m, struct ip *);		ip = mtod(m, struct ip *);

/* Run through list of hooks for output packets. */		/* Run through list of hooks for output packets. */
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#endif		#endif
m->m_pkthdr.csum_flags \|=		m->m_pkthdr.csum_flags \|=
CSUM_IP_CHECKED \| CSUM_IP_VALID;		CSUM_IP_CHECKED \| CSUM_IP_VALID;

*error = netisr_queue(NETISR_IP, m);		*error = netisr_queue(NETISR_IP, m);
return 1; /* Finished */		return 1; /* Finished */
}		}
/* Or forward to some other address? */		/* Or forward to some other address? */
if ((m->m_flags & M_IP_NEXTHOP) &&		if (IP_HAS_NEXTHOP(m) && !ip_get_fwdtag(m, dst, NULL)) {
((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
m->m_flags \|= M_SKIP_FIREWALL;		m->m_flags \|= M_SKIP_FIREWALL;
m->m_flags &= ~M_IP_NEXTHOP;		ip_flush_fwdtag(m);
m_tag_delete(m, fwd_tag);

return -1; /* Reloop for CHANGE of dst */		return -1; /* Reloop for CHANGE of dst */
}		}

return 0;		return 0;
}		}

/*		/*
* IP output. The packet in mbuf chain m contains a skeletal IP		* IP output. The packet in mbuf chain m contains a skeletal IP
▲ Show 20 Lines • Show All 1,208 Lines • ▼ Show 20 Lines	if (copym != NULL) {
/*		/*
* We don't bother to fragment if the IP length is greater		* We don't bother to fragment if the IP length is greater
* than the interface's MTU. Can this possibly matter?		* than the interface's MTU. Can this possibly matter?
*/		*/
ip = mtod(copym, struct ip *);		ip = mtod(copym, struct ip *);
ip->ip_sum = 0;		ip->ip_sum = 0;
ip->ip_sum = in_cksum(copym, hlen);		ip->ip_sum = in_cksum(copym, hlen);
if_simloop(ifp, copym, AF_INET, 0);		if_simloop(ifp, copym, AF_INET, 0);
		}
		}

		int
		ip_set_fwdtag(struct mbuf m, struct sockaddr_in dst, u_short ifidx)
		{
		struct sockaddr_in *sa;
		struct m_tag *fwd_tag;

		(void)ifidx; /* XXX: store after dst, or make struct? */

		KASSERT(dst != NULL, ("%s: !dst", __func__));
		KASSERT(dst->sin_family == AF_INET, ("%s: !AF_INET", __func__));

		fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
		if (fwd_tag != NULL) {
		KASSERT(((struct sockaddr *)(fwd_tag+1))->sa_family ==
		AF_INET, ("%s: !AF_INET", __func__));

		m_tag_unlink(m, fwd_tag);
		} else {
		fwd_tag = m_tag_get(PACKET_TAG_IPFORWARD, sizeof(*dst),
		aeUnsubmitted Done Inline Actions I think return error code is better than magic value. How about (ENOBUFS)? ae: I think return error code is better than magic value. How about (ENOBUFS)?
		M_NOWAIT);
		if (fwd_tag == NULL) {
		return (ENOBUFS);
		}
		}
		aeUnsubmitted Done Inline Actions I think it would be good add KASSERT(dst->sin_family == AF_INET) for consistency. ae: I think it would be good add KASSERT(dst->sin_family == AF_INET) for consistency.

		sa = (struct sockaddr_in *)(fwd_tag+1);

		bcopy(dst, sa, sizeof(*dst));
		m->m_flags \|= M_IP_NEXTHOP;

		if (in_localip(sa->sin_addr))
		m->m_flags \|= M_FASTFWD_OURS;
		else
		m->m_flags &= ~M_FASTFWD_OURS;

		aeUnsubmitted Done Inline Actions "Values in return statements should be enclosed in parentheses." (c) style(9) :-) ae: "Values in return statements should be enclosed in parentheses." (c) style(9) :-)
		m_tag_prepend(m, fwd_tag);

		return (0);
		}

		int
		ip_get_fwdtag(struct mbuf m, struct sockaddr_in dst, u_short *ifidx)
		{
		struct m_tag *fwd_tag;

		aeUnsubmitted Done Inline Actions ENOENT/ESRCH ae: ENOENT/ESRCH
		fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
		if (fwd_tag == NULL) {
		return (ENOENT);
		}

		KASSERT(((struct sockaddr *)(fwd_tag+1))->sa_family == AF_INET,
		("%s: !AF_INET", __func__));

		if (dst != NULL) {
		bcopy((fwd_tag+1), dst, sizeof(*dst));
		}

		if (ifidx != NULL) {
		/* XXX ifidx is not yet defined */
		}

		return (0);
		}

		void
		ip_flush_fwdtag(struct mbuf *m)
		{
		struct m_tag *fwd_tag;

		fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
		if (fwd_tag != NULL) {
		KASSERT(((struct sockaddr *)(fwd_tag+1))->sa_family ==
		AF_INET, ("%s: !AF_INET", __func__));

		m->m_flags &= ~(M_IP_NEXTHOP \| M_FASTFWD_OURS);
		m_tag_delete(m, fwd_tag);
}		}
}		}