Function in_pcballoc

freebsd/netinet/in_pcb.c:580–646

* Allocate a PCB and associate it with the socket. * On success return with the PCB locked. */

 * On success return with the PCB locked.
 */
int
in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
{
	struct inpcb *inp;
	int error;

	error = 0;
	inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT);
	if (inp == NULL)
		return (ENOBUFS);
	bzero(&inp->inp_start_zero, inp_zero_size);
#ifdef NUMA
	inp->inp_numa_domain = M_NODOM;
#endif
	inp->inp_pcbinfo = pcbinfo;
	inp->inp_socket = so;
	inp->inp_cred = crhold(so->so_cred);
	inp->inp_inc.inc_fibnum = so->so_fibnum;
#ifdef MAC
	error = mac_inpcb_init(inp, M_NOWAIT);
	if (error != 0)
		goto out;
	mac_inpcb_create(so, inp);
#endif
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
	error = ipsec_init_pcbpolicy(inp);
	if (error != 0) {
#ifdef MAC
		mac_inpcb_destroy(inp);
#endif
		goto out;
	}
#endif /*IPSEC*/
#ifdef INET6
	if (INP_SOCKAF(so) == AF_INET6) {
		inp->inp_vflag |= INP_IPV6PROTO;
		if (V_ip6_v6only)
			inp->inp_flags |= IN6P_IPV6_V6ONLY;
	}
#endif
	INP_WLOCK(inp);
	INP_LIST_WLOCK(pcbinfo);
	CK_LIST_INSERT_HEAD(pcbinfo->ipi_listhead, inp, inp_list);
	pcbinfo->ipi_count++;
	so->so_pcb = (caddr_t)inp;
#ifdef INET6
	if (V_ip6_auto_flowlabel)
		inp->inp_flags |= IN6P_AUTOFLOWLABEL;
#endif
	inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
	refcount_init(&inp->inp_refcount, 1);	/* Reference from inpcbinfo */

	/*
	 * Routes in inpcb's can cache L2 as well; they are guaranteed
	 * to be cleaned up.
	 */
	inp->inp_route.ro_flags = RT_LLE_CACHE;
	INP_LIST_WUNLOCK(pcbinfo);