/*
* Ip input routine. Checksum and byte swap header. If fragmented
* try to reassemble. Process options. Pass to next level.
*/
void
ip_input(struct mbuf *m)
{
struct ip *ip = NULL;
struct in_ifaddr *ia;
struct ifaddr *ifa;
int hlen = 0, len;
int downmatch;
int checkif;
int srcrt = 0;
MCLAIM(m, &ip_rx_mowner);
KASSERT((m->m_flags & M_PKTHDR) != 0);
/*
* If no IP addresses have been set yet but the interfaces
* are receiving, can't do anything with incoming packets yet.
*/
if (TAILQ_FIRST(&in_ifaddrhead) == 0)
goto bad;
IP_STATINC(IP_STAT_TOTAL);
/*
* If the IP header is not aligned, slurp it up into a new
* mbuf with space for link headers, in the event we forward
* it. Otherwise, if it is aligned, make sure the entire
* base IP header is in the first mbuf of the chain.
*/
if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
if ((m = m_copyup(m, sizeof(struct ip),
(max_linkhdr + 3) & ~3)) == NULL) {
/* XXXJRT new stat, please */
IP_STATINC(IP_STAT_TOOSMALL);
return;
}
} else if (__predict_false(m->m_len < sizeof (struct ip))) {
/*
* IP output. The packet in mbuf chain m contains a skeletal IP
* header (with len, off, ttl, proto, tos, src, dst).
* The mbuf chain containing the packet will be freed.
* The mbuf opt, if present, will not be freed.
*/
int
ip_output(struct mbuf *m0, ...)
{
struct rtentry *rt;
struct ip *ip;
struct ifnet *ifp;
struct mbuf *m = m0;
int hlen = sizeof (struct ip);
int len, error = 0;
struct route iproute;
const struct sockaddr_in *dst;
struct in_ifaddr *ia;
struct ifaddr *xifa;
struct mbuf *opt;
struct route *ro;
int flags, sw_csum;
u_long mtu;
struct ip_moptions *imo;
struct socket *so;
va_list ap;
struct secpolicy *sp = NULL;
bool natt_frag = false;
bool __unused done = false;
union {
struct sockaddr dst;
struct sockaddr_in dst4;
} u;
struct sockaddr *rdst = &u.dst; /* real IP destination, as opposed
* to the nexthop
*/
len = 0;
va_start(ap, m0);
opt = va_arg(ap, struct mbuf *);
ro = va_arg(ap, struct route *);
flags = va_arg(ap, int);
imo = va_arg(ap, struct ip_moptions *);
so = va_arg(ap, struct socket *);
va_end(ap);
MCLAIM(m, &ip_tx_mowner);
KASSERT((m->m_flags & M_PKTHDR) != 0);
KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == 0);
KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) !=
(M_CSUM_TCPv4|M_CSUM_UDPv4));
if (opt) {
m = ip_insertoptions(m, opt, &len);
if (len >= sizeof(struct ip))
hlen = len;
}
ip = mtod(m, struct ip *);
/*
* Fill in IP header.
*/
if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
ip->ip_v = IPVERSION;
ip->ip_off = htons(0);
/* ip->ip_id filled in after we find out source ia */
ip->ip_hl = hlen >> 2;
IP_STATINC(IP_STAT_LOCALOUT);
} else {
