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authorDavid Gibson <david@gibson.dropbear.id.au>2022-10-19 11:43:54 +1100
committerStefano Brivio <sbrivio@redhat.com>2022-10-19 03:34:51 +0200
commitcb1edae3b5cac6df68116ebce8e4194d4153d688 (patch)
treed65ea4504f0b0304e345cc2b649374b21c200a01
parent9d8dd8b6f4a99beb73a1460100e4a2a410ac673a (diff)
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ndp: Remove unneeded eh_source parameter
ndp() takes a parameter giving the ethernet source address of the packet it is to respond to, which it uses to determine the destination address to send the reply packet to. This is not necessary, because the address will always be the guest's MAC address. Even if the guest has just changed MAC address, then either tap_handler_passt() or tap_handler_pasta() - which are the only call paths leading to ndp() will have updated c->mac_guest with the new value. So, remove the parameter, and just use c->mac_guest, making it more consistent with other paths where we construct packets to send inwards. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
-rw-r--r--ndp.c6
-rw-r--r--ndp.h3
-rw-r--r--tap.c2
3 files changed, 4 insertions, 7 deletions
diff --git a/ndp.c b/ndp.c
index 79be0cf..f96b4b7 100644
--- a/ndp.c
+++ b/ndp.c
@@ -41,13 +41,11 @@
* ndp() - Check for NDP solicitations, reply as needed
* @c: Execution context
* @ih: ICMPv6 header
- * @eh_source: Source Ethernet address
* @saddr Source IPv6 address
*
* Return: 0 if not handled here, 1 if handled, -1 on failure
*/
-int ndp(struct ctx *c, const struct icmp6hdr *ih,
- const unsigned char *eh_source, const struct in6_addr *saddr)
+int ndp(struct ctx *c, const struct icmp6hdr *ih, const struct in6_addr *saddr)
{
char buf[BUFSIZ] = { 0 };
struct ipv6hdr *ip6hr;
@@ -196,7 +194,7 @@ dns_done:
ip6hr->hop_limit = 255;
len += sizeof(*ehr) + sizeof(*ip6hr) + sizeof(*ihr);
- memcpy(ehr->h_dest, eh_source, ETH_ALEN);
+ memcpy(ehr->h_dest, c->mac_guest, ETH_ALEN);
memcpy(ehr->h_source, c->mac, ETH_ALEN);
ehr->h_proto = htons(ETH_P_IPV6);
diff --git a/ndp.h b/ndp.h
index d857425..b012747 100644
--- a/ndp.h
+++ b/ndp.h
@@ -6,7 +6,6 @@
#ifndef NDP_H
#define NDP_H
-int ndp(struct ctx *c, const struct icmp6hdr *ih,
- const unsigned char *eh_source, const struct in6_addr *saddr);
+int ndp(struct ctx *c, const struct icmp6hdr *ih, const struct in6_addr *saddr);
#endif /* NDP_H */
diff --git a/tap.c b/tap.c
index 135d799..0031d82 100644
--- a/tap.c
+++ b/tap.c
@@ -576,7 +576,7 @@ resume:
if (l4_len < sizeof(struct icmp6hdr))
continue;
- if (ndp(c, (struct icmp6hdr *)l4h, eh->h_source, saddr))
+ if (ndp(c, (struct icmp6hdr *)l4h, saddr))
continue;
tap_packet_debug(NULL, ip6h, NULL, proto, NULL, 1);