mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Cc: "Edmund Henniges" <eh@emlix.com>, "Daniel Glöckner" <dg@emlix.com>
Subject: [PATCH 09/11] net: reply to ping requests
Date: Wed, 22 Apr 2020 09:54:50 +0200	[thread overview]
Message-ID: <20200422075452.25226-10-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20200422075452.25226-1-s.hauer@pengutronix.de>

Now that we have the network receive function running in a poller we
can reasonably well answer to ping requests. Implement this feature.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 net/net.c | 46 ++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/net/net.c b/net/net.c
index 6eb604e5dc..e0cded5783 100644
--- a/net/net.c
+++ b/net/net.c
@@ -573,12 +573,54 @@ static int net_handle_udp(unsigned char *pkt, int len)
 	return -EINVAL;
 }
 
-static int net_handle_icmp(unsigned char *pkt, int len)
+static int ping_reply(struct eth_device *edev, unsigned char *pkt, int len)
+{
+	struct ethernet *et = (struct ethernet *)pkt;
+	struct icmphdr *icmp;
+	struct iphdr *ip = (struct iphdr *)(pkt + ETHER_HDR_SIZE);
+	unsigned char *packet;
+	int ret;
+
+	memcpy(et->et_dest, et->et_src, 6);
+	memcpy(et->et_src, edev->ethaddr, 6);
+	et->et_protlen = htons(PROT_IP);
+
+	icmp = net_eth_to_icmphdr(pkt);
+
+	icmp->type = ICMP_ECHO_REPLY;
+	icmp->checksum = 0;
+	icmp->checksum = ~net_checksum((unsigned char *)icmp,
+				       len - sizeof(struct iphdr) - ETHER_HDR_SIZE);
+	ip->check = 0;
+	ip->frag_off = 0;
+	net_copy_ip((void *)&ip->daddr, &ip->saddr);
+	net_copy_ip((void *)&ip->saddr, &edev->ipaddr);
+	ip->check = ~net_checksum((unsigned char *)ip, sizeof(struct iphdr));
+
+	packet = net_alloc_packet();
+	if (!packet)
+		return 0;
+
+	memcpy(packet, pkt, ETHER_HDR_SIZE + len);
+
+	ret = eth_send(edev, packet, ETHER_HDR_SIZE + len);
+
+	free(packet);
+
+	return 0;
+}
+
+static int net_handle_icmp(struct eth_device *edev, unsigned char *pkt, int len)
 {
 	struct net_connection *con;
+	struct icmphdr *icmp;
 
 	pr_debug("%s\n", __func__);
 
+	icmp = net_eth_to_icmphdr(pkt);
+	if (icmp->type == ICMP_ECHO_REQUEST)
+		ping_reply(edev, pkt, len);
+
 	list_for_each_entry(con, &connection_list, list) {
 		if (con->proto == IPPROTO_ICMP) {
 			con->handler(con->priv, pkt, len);
@@ -615,7 +657,7 @@ static int net_handle_ip(struct eth_device *edev, unsigned char *pkt, int len)
 
 	switch (ip->protocol) {
 	case IPPROTO_ICMP:
-		return net_handle_icmp(pkt, len);
+		return net_handle_icmp(edev, pkt, len);
 	case IPPROTO_UDP:
 		return net_handle_udp(pkt, len);
 	}
-- 
2.26.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

  parent reply	other threads:[~2020-04-22  7:54 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-22  7:54 [PATCH v4 00/11] Protect code from pollers Sascha Hauer
2020-04-22  7:54 ` [PATCH 01/11] poller: Give pollers a name Sascha Hauer
2020-04-22  7:54 ` [PATCH 02/11] poller: Add a poller command Sascha Hauer
2020-04-22  7:54 ` [PATCH 03/11] Introduce slices Sascha Hauer
2020-05-08 18:01   ` Daniel Glöckner
2020-05-11  6:40     ` Sascha Hauer
2020-04-22  7:54 ` [PATCH 04/11] net: Add a slice to struct eth_device Sascha Hauer
2020-04-22  7:54 ` [PATCH 05/11] net: mdiobus: Add slice Sascha Hauer
2020-04-22  7:54 ` [PATCH 06/11] usb: Add a slice to usb host controllers Sascha Hauer
2020-04-22  7:54 ` [PATCH 07/11] usbnet: Add slice Sascha Hauer
2020-04-22  7:54 ` [PATCH 08/11] net: Call net_poll() in a poller Sascha Hauer
2020-04-22  7:54 ` Sascha Hauer [this message]
2020-04-22  7:54 ` [PATCH 10/11] usbnet: Be more friendly in the receive path Sascha Hauer
2020-04-22  7:54 ` [PATCH 11/11] poller: Allow to run pollers inside of pollers Sascha Hauer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200422075452.25226-10-s.hauer@pengutronix.de \
    --to=s.hauer@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    --cc=dg@emlix.com \
    --cc=eh@emlix.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox