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Commit b7394d24 authored by Cong Wang's avatar Cong Wang Committed by David S. Miller
Browse files

netpoll: prepare for ipv6 



This patch adjusts some struct and functions, to prepare
for supporting IPv6.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: default avatarCong Wang <amwang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0c7768a0

drivers/net/netconsole.c

+8 −4
Original line number Diff line number Diff line
@@ -269,11 +269,13 @@ static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) 


static ssize_t show_local_ip(struct netconsole_target *nt, char *buf)

{

	if (!nt->np.ipv6)

		return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip);

}



static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf)

{

	if (!nt->np.ipv6)

		return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip);

}
@@ -410,7 +412,8 @@ static ssize_t store_local_ip(struct netconsole_target *nt, 
		return -EINVAL;

	}



	nt->np.local_ip = in_aton(buf);

	if (!strnchr(buf, count, ':'))

		nt->np.local_ip.ip = in_aton(buf);



	return strnlen(buf, count);

}
@@ -426,7 +429,8 @@ static ssize_t store_remote_ip(struct netconsole_target *nt, 
		return -EINVAL;

	}



	nt->np.remote_ip = in_aton(buf);

	if (!strnchr(buf, count, ':'))

		nt->np.remote_ip.ip = in_aton(buf);



	return strnlen(buf, count);

}

include/linux/netpoll.h

+11 −2
Original line number Diff line number Diff line
@@ -12,13 +12,22 @@ 
#include <linux/rcupdate.h>

#include <linux/list.h>



union inet_addr {

	__u32		all[4];

	__be32		ip;

	__be32		ip6[4];

	struct in_addr	in;

	struct in6_addr	in6;

};



struct netpoll {

	struct net_device *dev;

	char dev_name[IFNAMSIZ];

	const char *name;

	void (*rx_hook)(struct netpoll *, int, char *, int);



	__be32 local_ip, remote_ip;

	union inet_addr local_ip, remote_ip;

	bool ipv6;

	u16 local_port, remote_port;

	u8 remote_mac[ETH_ALEN];
@@ -33,7 +42,7 @@ struct netpoll_info { 
	spinlock_t rx_lock;

	struct list_head rx_np; /* netpolls that registered an rx_hook */



	struct sk_buff_head arp_tx; /* list of arp requests to reply to */

	struct sk_buff_head neigh_tx; /* list of neigh requests to reply to */

	struct sk_buff_head txq;



	struct delayed_work tx_work;

net/core/netpoll.c

+224 −178
Original line number Diff line number Diff line
@@ -55,7 +55,7 @@ static atomic_t trapped; 
	 MAX_UDP_CHUNK)



static void zap_completion_queue(void);

static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo);

static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo);



static unsigned int carrier_timeout = 4;

module_param(carrier_timeout, uint, 0644);
@@ -181,13 +181,13 @@ static void poll_napi(struct net_device *dev) 
	}

}



static void service_arp_queue(struct netpoll_info *npi)

static void service_neigh_queue(struct netpoll_info *npi)

{

	if (npi) {

		struct sk_buff *skb;



		while ((skb = skb_dequeue(&npi->arp_tx)))

			netpoll_arp_reply(skb, npi);

		while ((skb = skb_dequeue(&npi->neigh_tx)))

			netpoll_neigh_reply(skb, npi);

	}

}
@@ -216,14 +216,14 @@ static void netpoll_poll_dev(struct net_device *dev) 


			bond_dev = netdev_master_upper_dev_get_rcu(dev);

			bond_ni = rcu_dereference_bh(bond_dev->npinfo);

			while ((skb = skb_dequeue(&ni->arp_tx))) {

			while ((skb = skb_dequeue(&ni->neigh_tx))) {

				skb->dev = bond_dev;

				skb_queue_tail(&bond_ni->arp_tx, skb);

				skb_queue_tail(&bond_ni->neigh_tx, skb);

			}

		}

	}



	service_arp_queue(ni);

	service_neigh_queue(ni);



	zap_completion_queue();

}
@@ -386,7 +386,9 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len) 
	static atomic_t ip_ident;



	udp_len = len + sizeof(*udph);

	if (!np->ipv6)

		ip_len = udp_len + sizeof(*iph);



	total_len = ip_len + LL_RESERVED_SPACE(np->dev);



	skb = find_skb(np, total_len + np->dev->needed_tailroom,
@@ -403,9 +405,11 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len) 
	udph->source = htons(np->local_port);

	udph->dest = htons(np->remote_port);

	udph->len = htons(udp_len);



	if (!np->ipv6) {

		udph->check = 0;

	udph->check = csum_tcpudp_magic(np->local_ip,

					np->remote_ip,

		udph->check = csum_tcpudp_magic(np->local_ip.ip,

						np->remote_ip.ip,

						udp_len, IPPROTO_UDP,

						csum_partial(udph, udp_len, 0));

		if (udph->check == 0)
@@ -424,13 +428,15 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len) 
		iph->ttl      = 64;

		iph->protocol = IPPROTO_UDP;

		iph->check    = 0;

	put_unaligned(np->local_ip, &(iph->saddr));

	put_unaligned(np->remote_ip, &(iph->daddr));

		put_unaligned(np->local_ip.ip, &(iph->saddr));

		put_unaligned(np->remote_ip.ip, &(iph->daddr));

		iph->check    = ip_fast_csum((unsigned char *)iph, iph->ihl);



		eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);

		skb_reset_mac_header(skb);

		skb->protocol = eth->h_proto = htons(ETH_P_IP);

	}



	memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN);

	memcpy(eth->h_dest, np->remote_mac, ETH_ALEN);
@@ -440,7 +446,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len) 
}

EXPORT_SYMBOL(netpoll_send_udp);



static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo)

static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo)

{

	struct arphdr *arp;

	unsigned char *arp_ptr;
@@ -451,7 +457,7 @@ static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo) 
	struct netpoll *np, *tmp;

	unsigned long flags;

	int hlen, tlen;

	int hits = 0;

	int hits = 0, proto;



	if (list_empty(&npinfo->rx_np))

		return;
@@ -469,6 +475,8 @@ static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo) 
	if (!hits)

		return;



	proto = ntohs(eth_hdr(skb)->h_proto);

	if (proto == ETH_P_IP) {

		/* No arp on this interface */

		if (skb->dev->flags & IFF_NOARP)

			return;
@@ -505,7 +513,7 @@ static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo) 


		spin_lock_irqsave(&npinfo->rx_lock, flags);

		list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {

		if (tip != np->local_ip)

			if (tip != np->local_ip.ip)

				continue;



			hlen = LL_RESERVED_SPACE(np->dev);
@@ -558,6 +566,7 @@ static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo) 
		}

		spin_unlock_irqrestore(&npinfo->rx_lock, flags);

	}

}



int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo)

{
@@ -576,7 +585,7 @@ int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo) 
	/* check if netpoll clients need ARP */

	if (skb->protocol == htons(ETH_P_ARP) &&

	    atomic_read(&trapped)) {

		skb_queue_tail(&npinfo->arp_tx, skb);

		skb_queue_tail(&npinfo->neigh_tx, skb);

		return 1;

	}
@@ -587,13 +596,14 @@ int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo) 
	}



	proto = ntohs(eth_hdr(skb)->h_proto);

	if (proto != ETH_P_IP)

	if (proto != ETH_P_IP && proto != ETH_P_IPV6)

		goto out;

	if (skb->pkt_type == PACKET_OTHERHOST)

		goto out;

	if (skb_shared(skb))

		goto out;



	if (proto == ETH_P_IP) {

		if (!pskb_may_pull(skb, sizeof(struct iphdr)))

			goto out;

		iph = (struct iphdr *)skb->data;
@@ -628,11 +638,10 @@ int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo) 
			goto out;

		if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))

			goto out;



		list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {

		if (np->local_ip && np->local_ip != iph->daddr)

			if (np->local_ip.ip && np->local_ip.ip != iph->daddr)

				continue;

		if (np->remote_ip && np->remote_ip != iph->saddr)

			if (np->remote_ip.ip && np->remote_ip.ip != iph->saddr)

				continue;

			if (np->local_port && np->local_port != ntohs(uh->dest))

				continue;
@@ -642,6 +651,7 @@ int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo) 
				       ulen - sizeof(struct udphdr));

			hits++;

		}

	}



	if (!hits)

		goto out;
@@ -661,17 +671,40 @@ out: 
void netpoll_print_options(struct netpoll *np)

{

	np_info(np, "local port %d\n", np->local_port);

	np_info(np, "local IP %pI4\n", &np->local_ip);

	if (!np->ipv6)

		np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip);

	np_info(np, "interface '%s'\n", np->dev_name);

	np_info(np, "remote port %d\n", np->remote_port);

	np_info(np, "remote IP %pI4\n", &np->remote_ip);

	if (!np->ipv6)

		np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip);

	np_info(np, "remote ethernet address %pM\n", np->remote_mac);

}

EXPORT_SYMBOL(netpoll_print_options);



static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr)

{

	const char *end;



	if (!strchr(str, ':') &&

	    in4_pton(str, -1, (void *)addr, -1, &end) > 0) {

		if (!*end)

			return 0;

	}

	if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) {

#if IS_ENABLED(CONFIG_IPV6)

		if (!*end)

			return 1;

#else

		return -1;

#endif

	}

	return -1;

}



int netpoll_parse_options(struct netpoll *np, char *opt)

{

	char *cur=opt, *delim;

	int ipv6;



	if (*cur != '@') {

		if ((delim = strchr(cur, '@')) == NULL)
@@ -687,7 +720,11 @@ int netpoll_parse_options(struct netpoll *np, char *opt) 
		if ((delim = strchr(cur, '/')) == NULL)

			goto parse_failed;

		*delim = 0;

		np->local_ip = in_aton(cur);

		ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip);

		if (ipv6 < 0)

			goto parse_failed;

		else

			np->ipv6 = (bool)ipv6;

		cur = delim;

	}

	cur++;
@@ -719,7 +756,13 @@ int netpoll_parse_options(struct netpoll *np, char *opt) 
	if ((delim = strchr(cur, '/')) == NULL)

		goto parse_failed;

	*delim = 0;

	np->remote_ip = in_aton(cur);

	ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip);

	if (ipv6 < 0)

		goto parse_failed;

	else if (np->ipv6 != (bool)ipv6)

		goto parse_failed;

	else

		np->ipv6 = (bool)ipv6;

	cur = delim + 1;



	if (*cur != 0) {
@@ -767,7 +810,7 @@ int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp) 
		INIT_LIST_HEAD(&npinfo->rx_np);



		spin_lock_init(&npinfo->rx_lock);

		skb_queue_head_init(&npinfo->arp_tx);

		skb_queue_head_init(&npinfo->neigh_tx);

		skb_queue_head_init(&npinfo->txq);

		INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
@@ -859,10 +902,12 @@ int netpoll_setup(struct netpoll *np) 
		}

	}



	if (!np->local_ip) {

	if (!np->local_ip.ip) {

		if (!np->ipv6) {

			rcu_read_lock();

			in_dev = __in_dev_get_rcu(ndev);





			if (!in_dev || !in_dev->ifa_list) {

				rcu_read_unlock();

				np_err(np, "no IP address for %s, aborting\n",
@@ -871,9 +916,10 @@ int netpoll_setup(struct netpoll *np) 
				goto put;

			}



		np->local_ip = in_dev->ifa_list->ifa_local;

			np->local_ip.ip = in_dev->ifa_list->ifa_local;

			rcu_read_unlock();

		np_info(np, "local IP %pI4\n", &np->local_ip);

			np_info(np, "local IP %pI4\n", &np->local_ip.ip);

		}

	}



	/* fill up the skb queue */
@@ -906,7 +952,7 @@ static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) 
	struct netpoll_info *npinfo =

			container_of(rcu_head, struct netpoll_info, rcu);



	skb_queue_purge(&npinfo->arp_tx);

	skb_queue_purge(&npinfo->neigh_tx);

	skb_queue_purge(&npinfo->txq);



	/* we can't call cancel_delayed_work_sync here, as we are in softirq */