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C++ dst_hold函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中dst_hold函数的典型用法代码示例。如果您正苦于以下问题：C++ dst_hold函数的具体用法？C++ dst_hold怎么用？C++ dst_hold使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了dst_hold函数的18个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: skb_dst_set_noref

/**
 * skb_dst_set_noref - sets skb dst, without a reference
 * @skb: buffer
 * @dst: dst entry
 *
 * Sets skb dst, assuming a reference was not taken on dst
 * skb_dst_drop() should not dst_release() this dst
 */
void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst)
{
	WARN_ON(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
	/* If dst not in cache, we must take a reference, because
	 * dst_release() will destroy dst as soon as its refcount becomes zero
	 */
	if (unlikely(dst->flags & DST_NOCACHE)) {
		dst_hold(dst);
		skb_dst_set(skb, dst);
	} else {
		skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF;
	}
}
开发者ID:Stefan-Schmidt，项目名称:linux-2.6，代码行数:21，代码来源:dst.c


示例2: __ip_vs_dst_check

static inline struct dst_entry *
__ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos, u32 cookie)
{
	struct dst_entry *dst = dest->dst_cache;

	if (!dst)
		return NULL;
	if ((dst->obsolete || rtos != dest->dst_rtos) &&
	    dst->ops->check(dst, cookie) == NULL) {
		dest->dst_cache = NULL;
		return NULL;
	}
	dst_hold(dst);
	return dst;
}
开发者ID:Antonio-Zhou，项目名称:Linux-2.6.11，代码行数:15，代码来源:ip_vs_xmit.c


示例3: nfp_repr_xmit

static netdev_tx_t nfp_repr_xmit(struct sk_buff *skb, struct net_device *netdev)
{
	struct nfp_repr *repr = netdev_priv(netdev);
	unsigned int len = skb->len;
	int ret;

	skb_dst_drop(skb);
	dst_hold((struct dst_entry *)repr->dst);
	skb_dst_set(skb, (struct dst_entry *)repr->dst);
	skb->dev = repr->dst->u.port_info.lower_dev;

	ret = dev_queue_xmit(skb);
	nfp_repr_inc_tx_stats(netdev, len, ret);

	return NETDEV_TX_OK;
}
开发者ID:avagin，项目名称:linux，代码行数:16，代码来源:nfp_net_repr.c


示例4: __adf_net_indicate_packet

a_status_t
__adf_net_indicate_packet(adf_net_handle_t hdl, struct sk_buff *skb,
                          uint32_t len)
{
    struct net_device *netdev   = hdl_to_netdev(hdl);
    __adf_softc_t  *sc          = hdl_to_softc(hdl);
    /**
     * For pseudo devices IP checksum has to computed
     */
    if(adf_os_unlikely(skb->ip_summed == CHECKSUM_UNNECESSARY))
        __adf_net_ip_cksum(skb);

    /**
     * also pulls the ether header
     */
    skb->protocol           =   eth_type_trans(skb, netdev);
    skb->dev                =   netdev;
    netdev->last_rx         =   jiffies;
#ifdef LIMIT_MTU_SIZE

    if (skb->len >=  LIMITED_MTU) {
        skb->h.raw = skb->nh.raw = skb->data;

        skb->dst = (struct dst_entry *)&__fake_rtable;
        skb->pkt_type = PACKET_HOST;
        dst_hold(skb->dst);

#if 0
        printk("addrs : sa : %x : da:%x\n", skb->nh.iph->saddr, skb->nh.iph->daddr);
        printk("head : %p tail : %p iph %p %p\n", skb->head, skb->tail,
                skb->nh.iph, skb->mac.raw);
#endif 

        icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(LIMITED_MTU - 4 ));
        dev_kfree_skb_any(skb);
        return A_STATUS_OK;
    }
#endif


    
    if(sc->vlgrp)       __vlan_hwaccel_put_tag(skb, sc->vid);
    if (in_irq())  	netif_rx(skb);
    else                netif_receive_skb(skb);

    return A_STATUS_OK;
}
开发者ID:KHATEEBNSIT，项目名称:AP，代码行数:47，代码来源:adf_net.c


示例5: netdev_priv

static struct rtable *vrf_get_rtable(const struct net_device *dev,
				     const struct flowi4 *fl4)
{
	struct rtable *rth = NULL;

	if (!(fl4->flowi4_flags & FLOWI_FLAG_L3MDEV_SRC)) {
		struct net_vrf *vrf = netdev_priv(dev);

		rcu_read_lock();

		rth = rcu_dereference(vrf->rth);
		if (likely(rth))
			dst_hold(&rth->dst);

		rcu_read_unlock();
	}

	return rth;
}
开发者ID:513855417，项目名称:linux，代码行数:19，代码来源:vrf.c


示例6: br_nf_pre_routing_finish_ipv6

/* Undo the changes made for ip6tables PREROUTING and continue the
 * bridge PRE_ROUTING hook. */
static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
{
	struct nf_bridge_info *nf_bridge = skb->nf_bridge;

	if (nf_bridge->mask & BRNF_PKT_TYPE) {
		skb->pkt_type = PACKET_OTHERHOST;
		nf_bridge->mask ^= BRNF_PKT_TYPE;
	}
	nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;

	skb->dst = (struct dst_entry *)&__fake_rtable;
	dst_hold(skb->dst);

	skb->dev = nf_bridge->physindev;
	nf_bridge_push_encap_header(skb);
	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
		       br_handle_frame_finish, 1);

	return 0;
}
开发者ID:NikhilNJ，项目名称:screenplay-dx，代码行数:22，代码来源:br_netfilter.c


示例7: read_lock_bh

struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
			    int oif, int flags)
{
	struct fib6_node *fn;
	struct rt6_info *rt;

	read_lock_bh(&rt6_lock);
	fn = fib6_lookup(&ip6_routing_table, daddr, saddr);
	rt = rt6_device_match(fn->leaf, oif, !!(flags & RT6_LOOKUP_FLAG_STRICT));
	dst_hold(&rt->u.dst);
	rt->u.dst.__use++;
	read_unlock_bh(&rt6_lock);

	if (!(flags & RT6_LOOKUP_FLAG_NOUSE))
		rt->u.dst.lastuse = jiffies;
	if (rt->u.dst.error == 0)
		return rt;
	dst_release(&rt->u.dst);
	return NULL;
}
开发者ID:jameshilliard，项目名称:actiontec_opensrc_mi424wr-rev-ef_fw-20-19-8，代码行数:20，代码来源:route.c


示例8: ipv6_ac_destroy_dev

void ipv6_ac_destroy_dev(struct inet6_dev *idev)
{
	struct ifacaddr6 *aca;

	write_lock_bh(&idev->lock);
	while ((aca = idev->ac_list) != NULL) {
		idev->ac_list = aca->aca_next;
		write_unlock_bh(&idev->lock);

		addrconf_leave_solict(idev, &aca->aca_addr);

		dst_hold(&aca->aca_rt->dst);
		ip6_del_rt(aca->aca_rt);

		aca_put(aca);

		write_lock_bh(&idev->lock);
	}
	write_unlock_bh(&idev->lock);
}
开发者ID:Emineminero，项目名称:DORIMANX_LG_STOCK_LP_KERNEL，代码行数:20，代码来源:anycast.c


示例9: sk_dst_get

static struct dst_entry *rxe_find_route(struct net_device *ndev,
					struct rxe_qp *qp,
					struct rxe_av *av)
{
	struct dst_entry *dst = NULL;

	if (qp_type(qp) == IB_QPT_RC)
		dst = sk_dst_get(qp->sk->sk);

	if (!dst || !dst_check(dst, qp->dst_cookie)) {
		if (dst)
			dst_release(dst);

		if (av->network_type == RDMA_NETWORK_IPV4) {
			struct in_addr *saddr;
			struct in_addr *daddr;

			saddr = &av->sgid_addr._sockaddr_in.sin_addr;
			daddr = &av->dgid_addr._sockaddr_in.sin_addr;
			dst = rxe_find_route4(ndev, saddr, daddr);
		} else if (av->network_type == RDMA_NETWORK_IPV6) {
			struct in6_addr *saddr6;
			struct in6_addr *daddr6;

			saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
			daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
			dst = rxe_find_route6(ndev, saddr6, daddr6);
#if IS_ENABLED(CONFIG_IPV6)
			if (dst)
				qp->dst_cookie =
					rt6_get_cookie((struct rt6_info *)dst);
#endif
		}

		if (dst && (qp_type(qp) == IB_QPT_RC)) {
			dst_hold(dst);
			sk_dst_set(qp->sk->sk, dst);
		}
	}
	return dst;
}
开发者ID:avagin，项目名称:linux，代码行数:41，代码来源:rxe_net.c


示例10: br_nf_pre_routing_finish_ipv6

/* Undo the changes made for ip6tables PREROUTING and continue the
 * bridge PRE_ROUTING hook. */
static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
{
	struct nf_bridge_info *nf_bridge = skb->nf_bridge;

	if (nf_bridge->mask & BRNF_PKT_TYPE) {
		skb->pkt_type = PACKET_OTHERHOST;
		nf_bridge->mask ^= BRNF_PKT_TYPE;
	}
	nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;

	skb->dst = (struct dst_entry *)&__fake_rtable;
	dst_hold(skb->dst);

	skb->dev = nf_bridge->physindev;
	if (skb->protocol == htons(ETH_P_8021Q)) {
		skb_push(skb, VLAN_HLEN);
		skb->nh.raw -= VLAN_HLEN;
	}
	NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
		       br_handle_frame_finish, 1);

	return 0;
}
开发者ID:FatSunHYS，项目名称:OSCourseDesign，代码行数:25，代码来源:br_netfilter.c


示例11: ip_xfrm_me_harder

int ip_xfrm_me_harder(struct sk_buff **pskb)
{
	struct flowi fl;
	unsigned int hh_len;
	struct dst_entry *dst;

	if (IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED)
		return 0;
	if (xfrm_decode_session(*pskb, &fl, AF_INET) < 0)
		return -1;

	dst = (*pskb)->dst;
	if (dst->xfrm)
		dst = ((struct xfrm_dst *)dst)->route;
	dst_hold(dst);

	if (xfrm_lookup(&dst, &fl, (*pskb)->sk, 0) < 0)
		return -1;

	dst_release((*pskb)->dst);
	(*pskb)->dst = dst;

	/* Change in oif may mean change in hh_len. */
	hh_len = (*pskb)->dst->dev->hard_header_len;
	if (skb_headroom(*pskb) < hh_len) {
		struct sk_buff *nskb;

		nskb = skb_realloc_headroom(*pskb, hh_len);
		if (!nskb)
			return -1;
		if ((*pskb)->sk)
			skb_set_owner_w(nskb, (*pskb)->sk);
		kfree_skb(*pskb);
		*pskb = nskb;
	}
	return 0;
}
开发者ID:xiandaicxsj，项目名称:copyKvm，代码行数:37，代码来源:netfilter.c


示例12: tcp_v6_err

static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
		u8 type, u8 code, int offset, __be32 info)
{
	const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data;
	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
	struct ipv6_pinfo *np;
	struct sock *sk;
	int err;
	struct tcp_sock *tp;
	__u32 seq;
	struct net *net = dev_net(skb->dev);

	sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
			th->dest, &hdr->saddr, th->source, skb->dev->ifindex);

	if (sk == NULL) {
		ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
				   ICMP6_MIB_INERRORS);
		return;
	}

	if (sk->sk_state == TCP_TIME_WAIT) {
		inet_twsk_put(inet_twsk(sk));
		return;
	}

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk))
		NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);

	if (sk->sk_state == TCP_CLOSE)
		goto out;

	if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
		goto out;
	}

	tp = tcp_sk(sk);
	seq = ntohl(th->seq);
	if (sk->sk_state != TCP_LISTEN &&
	    !between(seq, tp->snd_una, tp->snd_nxt)) {
		NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
		goto out;
	}

	np = inet6_sk(sk);

	if (type == ICMPV6_PKT_TOOBIG) {
		struct dst_entry *dst;

		if (sock_owned_by_user(sk))
			goto out;
		if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
			goto out;

		
		dst = __sk_dst_check(sk, np->dst_cookie);

		if (dst == NULL) {
			struct inet_sock *inet = inet_sk(sk);
			struct flowi6 fl6;

			memset(&fl6, 0, sizeof(fl6));
			fl6.flowi6_proto = IPPROTO_TCP;
			fl6.daddr = np->daddr;
			fl6.saddr = np->saddr;
			fl6.flowi6_oif = sk->sk_bound_dev_if;
			fl6.flowi6_mark = sk->sk_mark;
			fl6.fl6_dport = inet->inet_dport;
			fl6.fl6_sport = inet->inet_sport;
			fl6.flowi6_uid = sock_i_uid(sk);
			security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));

			dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
			if (IS_ERR(dst)) {
				sk->sk_err_soft = -PTR_ERR(dst);
				goto out;
			}

		} else
			dst_hold(dst);

		if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
			tcp_sync_mss(sk, dst_mtu(dst));
			tcp_simple_retransmit(sk);
		} 
		dst_release(dst);
		goto out;
	}

	icmpv6_err_convert(type, code, &err);

	
	switch (sk->sk_state) {
		struct request_sock *req, **prev;
	case TCP_LISTEN:
		if (sock_owned_by_user(sk))
			goto out;

//.........这里部分代码省略.........
开发者ID:Leoyzen，项目名称:Charm-Eye，代码行数:101，代码来源:tcp_ipv6.c


示例13: __xfrm4_bundle_create

static int
__xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
		      struct flowi *fl, struct dst_entry **dst_p)
{
	struct dst_entry *dst, *dst_prev;
	struct rtable *rt0 = (struct rtable*)(*dst_p);
	struct rtable *rt = rt0;
	struct flowi fl_tunnel = {
		.nl_u = {
			.ip4_u = {
				.saddr = fl->fl4_src,
				.daddr = fl->fl4_dst,
				.tos = fl->fl4_tos
			}
		}
	};
	int i;
	int err;
	int header_len = 0;
	int trailer_len = 0;

	dst = dst_prev = NULL;
	dst_hold(&rt->u.dst);

	for (i = 0; i < nx; i++) {
		struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
		struct xfrm_dst *xdst;

		if (unlikely(dst1 == NULL)) {
			err = -ENOBUFS;
			dst_release(&rt->u.dst);
			goto error;
		}

		if (!dst)
			dst = dst1;
		else {
			dst_prev->child = dst1;
			dst1->flags |= DST_NOHASH;
			dst_clone(dst1);
		}

		xdst = (struct xfrm_dst *)dst1;
		xdst->route = &rt->u.dst;
		xdst->genid = xfrm[i]->genid;

		dst1->next = dst_prev;
		dst_prev = dst1;

		header_len += xfrm[i]->props.header_len;
		trailer_len += xfrm[i]->props.trailer_len;

		if (xfrm[i]->props.mode == XFRM_MODE_TUNNEL) {
			unsigned short encap_family = xfrm[i]->props.family;
			switch(encap_family) {
			case AF_INET:
				fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
				fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
				break;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
			case AF_INET6:
				ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6);
				ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6);
				break;
#endif
			default:
				BUG_ON(1);
			}
			err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
					      &fl_tunnel, encap_family);
			if (err)
				goto error;
		} else
			dst_hold(&rt->u.dst);
	}

	dst_prev->child = &rt->u.dst;
	dst->path = &rt->u.dst;

	*dst_p = dst;
	dst = dst_prev;

	dst_prev = *dst_p;
	i = 0;
	for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
		struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
		struct xfrm_state_afinfo *afinfo;
		x->u.rt.fl = *fl;

		dst_prev->xfrm = xfrm[i++];
		dst_prev->dev = rt->u.dst.dev;
		if (rt->u.dst.dev)
			dev_hold(rt->u.dst.dev);
		dst_prev->obsolete	= -1;
		dst_prev->flags	       |= DST_HOST;
		dst_prev->lastuse	= jiffies;
		dst_prev->header_len	= header_len;
		dst_prev->nfheader_len	= 0;
		dst_prev->trailer_len	= trailer_len;
		memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
//.........这里部分代码省略.........
开发者ID:StephenMacras，项目名称:dsl-n55u-bender，代码行数:101，代码来源:xfrm4_policy.c


示例14: ip6_append_data

int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
	int offset, int len, int odd, struct sk_buff *skb),
	void *from, int length, int transhdrlen,
	int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
	struct rt6_info *rt, unsigned int flags, int dontfrag)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct inet_cork *cork;
	struct sk_buff *skb, *skb_prev = NULL;
	unsigned int maxfraglen, fragheaderlen;
	int exthdrlen;
	int hh_len;
	int mtu;
	int copy;
	int err;
	int offset = 0;
	int csummode = CHECKSUM_NONE;
	__u8 tx_flags = 0;

	if (flags&MSG_PROBE)
		return 0;
	cork = &inet->cork.base;
	if (skb_queue_empty(&sk->sk_write_queue)) {
		/*
		 * setup for corking
		 */
		if (opt) {
			if (WARN_ON(np->cork.opt))
				return -EINVAL;

			np->cork.opt = kzalloc(opt->tot_len, sk->sk_allocation);
			if (unlikely(np->cork.opt == NULL))
				return -ENOBUFS;

			np->cork.opt->tot_len = opt->tot_len;
			np->cork.opt->opt_flen = opt->opt_flen;
			np->cork.opt->opt_nflen = opt->opt_nflen;

			np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt,
							    sk->sk_allocation);
			if (opt->dst0opt && !np->cork.opt->dst0opt)
				return -ENOBUFS;

			np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt,
							    sk->sk_allocation);
			if (opt->dst1opt && !np->cork.opt->dst1opt)
				return -ENOBUFS;

			np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt,
							   sk->sk_allocation);
			if (opt->hopopt && !np->cork.opt->hopopt)
				return -ENOBUFS;

			np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt,
							    sk->sk_allocation);
			if (opt->srcrt && !np->cork.opt->srcrt)
				return -ENOBUFS;

			/* need source address above miyazawa*/
		}
		dst_hold(&rt->dst);
		cork->dst = &rt->dst;
		inet->cork.fl.u.ip6 = *fl6;
		np->cork.hop_limit = hlimit;
		np->cork.tclass = tclass;
		if (rt->dst.flags & DST_XFRM_TUNNEL)
			mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
			      rt->dst.dev->mtu : dst_mtu(&rt->dst);
		else
			mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
			      rt->dst.dev->mtu : dst_mtu(rt->dst.path);
		if (np->frag_size < mtu) {
			if (np->frag_size)
				mtu = np->frag_size;
		}
		cork->fragsize = mtu;
		if (dst_allfrag(rt->dst.path))
			cork->flags |= IPCORK_ALLFRAG;
		cork->length = 0;
		sk->sk_sndmsg_page = NULL;
		sk->sk_sndmsg_off = 0;
		exthdrlen = rt->dst.header_len + (opt ? opt->opt_flen : 0) -
			    rt->rt6i_nfheader_len;
		length += exthdrlen;
		transhdrlen += exthdrlen;
	} else {
		rt = (struct rt6_info *)cork->dst;
		fl6 = &inet->cork.fl.u.ip6;
		opt = np->cork.opt;
		transhdrlen = 0;
		exthdrlen = 0;
		mtu = cork->fragsize;
	}

	hh_len = LL_RESERVED_SPACE(rt->dst.dev);

	fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
			(opt ? opt->opt_nflen : 0);
	maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr);
//.........这里部分代码省略.........
开发者ID:caoxin1988，项目名称:linux-3.0.86，代码行数:101，代码来源:ip6_output.c


示例15: ip6_setup_cork

static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
			  struct inet6_cork *v6_cork,
			  int hlimit, int tclass, struct ipv6_txoptions *opt,
			  struct rt6_info *rt, struct flowi6 *fl6)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	unsigned int mtu;

	/*
	 * setup for corking
	 */
	if (opt) {
		if (WARN_ON(v6_cork->opt))
			return -EINVAL;

		v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation);
		if (unlikely(!v6_cork->opt))
			return -ENOBUFS;

		v6_cork->opt->tot_len = opt->tot_len;
		v6_cork->opt->opt_flen = opt->opt_flen;
		v6_cork->opt->opt_nflen = opt->opt_nflen;

		v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt,
						    sk->sk_allocation);
		if (opt->dst0opt && !v6_cork->opt->dst0opt)
			return -ENOBUFS;

		v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt,
						    sk->sk_allocation);
		if (opt->dst1opt && !v6_cork->opt->dst1opt)
			return -ENOBUFS;

		v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt,
						   sk->sk_allocation);
		if (opt->hopopt && !v6_cork->opt->hopopt)
			return -ENOBUFS;

		v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt,
						    sk->sk_allocation);
		if (opt->srcrt && !v6_cork->opt->srcrt)
			return -ENOBUFS;

		/* need source address above miyazawa*/
	}
	dst_hold(&rt->dst);
	cork->base.dst = &rt->dst;
	cork->fl.u.ip6 = *fl6;
	v6_cork->hop_limit = hlimit;
	v6_cork->tclass = tclass;
	if (rt->dst.flags & DST_XFRM_TUNNEL)
		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
		      rt->dst.dev->mtu : dst_mtu(&rt->dst);
	else
		mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
		      rt->dst.dev->mtu : dst_mtu(rt->dst.path);
	if (np->frag_size < mtu) {
		if (np->frag_size)
			mtu = np->frag_size;
	}
	cork->base.fragsize = mtu;
	if (dst_allfrag(rt->dst.path))
		cork->base.flags |= IPCORK_ALLFRAG;
	cork->base.length = 0;

	return 0;
}
开发者ID:guanhe0，项目名称:kernel，代码行数:67，代码来源:ip6_output.c


示例16: ip6_fragment


//.........这里部分代码省略.........

		err = 0;
		offset = 0;
		/* BUILD HEADER */

		*prevhdr = NEXTHDR_FRAGMENT;
		tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
		if (!tmp_hdr) {
			IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
				      IPSTATS_MIB_FRAGFAILS);
			err = -ENOMEM;
			goto fail;
		}
		frag = skb_shinfo(skb)->frag_list;
		skb_frag_list_init(skb);

		__skb_pull(skb, hlen);
		fh = (struct frag_hdr *)__skb_push(skb, sizeof(struct frag_hdr));
		__skb_push(skb, hlen);
		skb_reset_network_header(skb);
		memcpy(skb_network_header(skb), tmp_hdr, hlen);

		fh->nexthdr = nexthdr;
		fh->reserved = 0;
		fh->frag_off = htons(IP6_MF);
		fh->identification = frag_id;

		first_len = skb_pagelen(skb);
		skb->data_len = first_len - skb_headlen(skb);
		skb->len = first_len;
		ipv6_hdr(skb)->payload_len = htons(first_len -
						   sizeof(struct ipv6hdr));

		dst_hold(&rt->dst);

		for (;;) {
			/* Prepare header of the next frame,
			 * before previous one went down. */
			if (frag) {
				frag->ip_summed = CHECKSUM_NONE;
				skb_reset_transport_header(frag);
				fh = (struct frag_hdr *)__skb_push(frag, sizeof(struct frag_hdr));
				__skb_push(frag, hlen);
				skb_reset_network_header(frag);
				memcpy(skb_network_header(frag), tmp_hdr,
				       hlen);
				offset += skb->len - hlen - sizeof(struct frag_hdr);
				fh->nexthdr = nexthdr;
				fh->reserved = 0;
				fh->frag_off = htons(offset);
				if (frag->next)
					fh->frag_off |= htons(IP6_MF);
				fh->identification = frag_id;
				ipv6_hdr(frag)->payload_len =
						htons(frag->len -
						      sizeof(struct ipv6hdr));
				ip6_copy_metadata(frag, skb);
			}

			err = output(net, sk, skb);
			if (!err)
				IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
					      IPSTATS_MIB_FRAGCREATES);

			if (err || !frag)
				break;
开发者ID:guanhe0，项目名称:kernel，代码行数:67，代码来源:ip6_output.c


示例17: ip6_fragment

int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
{
	struct sk_buff *frag;
	struct rt6_info *rt = (struct rt6_info*)skb_dst(skb);
	struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
	struct ipv6hdr *tmp_hdr;
	struct frag_hdr *fh;
	unsigned int mtu, hlen, left, len;
	__be32 frag_id = 0;
	int ptr, offset = 0, err=0;
	u8 *prevhdr, nexthdr = 0;
	struct net *net = dev_net(skb_dst(skb)->dev);

	hlen = ip6_find_1stfragopt(skb, &prevhdr);
	nexthdr = *prevhdr;

	mtu = ip6_skb_dst_mtu(skb);

	/* We must not fragment if the socket is set to force MTU discovery
	 * or if the skb it not generated by a local socket.
	 */
	if (!skb->local_df && skb->len > mtu) {
		skb->dev = skb_dst(skb)->dev;
		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
		IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
			      IPSTATS_MIB_FRAGFAILS);
		kfree_skb(skb);
		return -EMSGSIZE;
	}

	if (np && np->frag_size < mtu) {
		if (np->frag_size)
			mtu = np->frag_size;
	}
	mtu -= hlen + sizeof(struct frag_hdr);

	if (skb_has_frag_list(skb)) {
		int first_len = skb_pagelen(skb);
		struct sk_buff *frag2;

		if (first_len - hlen > mtu ||
		    ((first_len - hlen) & 7) ||
		    skb_cloned(skb))
			goto slow_path;

		skb_walk_frags(skb, frag) {
			/* Correct geometry. */
			if (frag->len > mtu ||
			    ((frag->len & 7) && frag->next) ||
			    skb_headroom(frag) < hlen)
				goto slow_path_clean;

			/* Partially cloned skb? */
			if (skb_shared(frag))
				goto slow_path_clean;

			BUG_ON(frag->sk);
			if (skb->sk) {
				frag->sk = skb->sk;
				frag->destructor = sock_wfree;
			}
			skb->truesize -= frag->truesize;
		}

		err = 0;
		offset = 0;
		frag = skb_shinfo(skb)->frag_list;
		skb_frag_list_init(skb);
		/* BUILD HEADER */

		*prevhdr = NEXTHDR_FRAGMENT;
		tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
		if (!tmp_hdr) {
			IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
				      IPSTATS_MIB_FRAGFAILS);
			return -ENOMEM;
		}

		__skb_pull(skb, hlen);
		fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr));
		__skb_push(skb, hlen);
		skb_reset_network_header(skb);
		memcpy(skb_network_header(skb), tmp_hdr, hlen);

		ipv6_select_ident(fh, &rt->rt6i_dst.addr);
		fh->nexthdr = nexthdr;
		fh->reserved = 0;
		fh->frag_off = htons(IP6_MF);
		frag_id = fh->identification;

		first_len = skb_pagelen(skb);
		skb->data_len = first_len - skb_headlen(skb);
		skb->len = first_len;
		ipv6_hdr(skb)->payload_len = htons(first_len -
						   sizeof(struct ipv6hdr));

		dst_hold(&rt->dst);

		for (;;) {
			/* Prepare header of the next frame,
//.........这里部分代码省略.........
开发者ID:caoxin1988，项目名称:linux-3.0.86，代码行数:101，代码来源:ip6_output.c


示例18: __xfrm6_bundle_create

static int
__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
		      struct flowi *fl, struct dst_entry **dst_p)
{
	struct dst_entry *dst, *dst_prev;
	struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
	struct rt6_info *rt  = rt0;
	struct in6_addr *remote = &fl->fl6_dst;
	struct in6_addr *local  = &fl->fl6_src;
	int i;
	int err = 0;
	int header_len = 0;
	int trailer_len = 0;

	dst = dst_prev = NULL;

	for (i = 0; i < nx; i++) {
		struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);

		if (unlikely(dst1 == NULL)) {
			err = -ENOBUFS;
			goto error;
		}

		if (!dst)
			dst = dst1;
		else {
			dst_prev->child = dst1;
			dst1->flags |= DST_NOHASH;
			dst_clone(dst1);
		}
		dst_prev = dst1;
		if (xfrm[i]->props.mode) {
			remote = (struct in6_addr*)&xfrm[i]->id.daddr;
			local  = (struct in6_addr*)&xfrm[i]->props.saddr;
		}
		header_len += xfrm[i]->props.header_len;
		trailer_len += xfrm[i]->props.trailer_len;
	}

	if (ipv6_addr_cmp(remote, &fl->fl6_dst)) {
		struct flowi fl_tunnel;

		memset(&fl_tunnel, 0, sizeof(fl_tunnel));
		ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
		ipv6_addr_copy(&fl_tunnel.fl6_src, local);

		err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
				      &fl_tunnel, AF_INET6);
		if (err)
			goto error;
	} else {
		dst_hold(&rt->u.dst);
	}
	dst_prev->child = &rt->u.dst;
	i = 0;
	for (dst_prev = dst; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
		struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;

		dst_prev->xfrm = xfrm[i++];
		dst_prev->dev = rt->u.dst.dev;
		if (rt->u.dst.dev)
			dev_hold(rt->u.dst.dev);
		dst_prev->obsolete	= -1;
		dst_prev->flags	       |= DST_HOST;
		dst_prev->lastuse	= jiffies;
		dst_prev->header_len	= header_len;
		dst_prev->trailer_len	= trailer_len;
		memcpy(&dst_prev->metrics, &rt->u.dst.metrics, sizeof(dst_prev->metrics));
		dst_prev->path		= &rt->u.dst;

		/* Copy neighbour for reachability confirmation */
		dst_prev->neighbour	= neigh_clone(rt->u.dst.neighbour);
		dst_prev->input		= rt->u.dst.input;
		dst_prev->output	= dst_prev->xfrm->type->output;
		/* Sheit... I remember I did this right. Apparently,
		 * it was magically lost, so this code needs audit */
		x->u.rt6.rt6i_flags    = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
		x->u.rt6.rt6i_metric   = rt0->rt6i_metric;
		x->u.rt6.rt6i_node     = rt0->rt6i_node;
		x->u.rt6.rt6i_gateway  = rt0->rt6i_gateway;
		memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway)); 
		x->u.rt6.rt6i_dst      = rt0->rt6i_dst;
		x->u.rt6.rt6i_src      = rt0->rt6i_src;	
		header_len -= x->u.dst.xfrm->props.header_len;
		trailer_len -= x->u.dst.xfrm->props.trailer_len;
	}
	*dst_p = dst;
	return 0;

error:
	if (dst)
		dst_free(dst);
	return err;
}
开发者ID:iPodLinux，项目名称:linux-2.6.7-ipod，代码行数:95，代码来源:xfrm6_policy.c



注：本文中的dst_hold函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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