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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrzej Kacprowski <andrzej.kacprowski@intel.com>
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Date: Fri, 21 Apr 2017 09:20:38 +0200
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Subject: [PATCH] Use xid to match DHCP replies
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Transaction identifier (xid) from DHCP request
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packet is stored in network level interface and used
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to match request with the responses it generates.
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Resolves: rhbz#1370642
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Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@intel.com>
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---
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grub-core/net/bootp.c | 3 ++-
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grub-core/net/ip.c | 1 +
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include/grub/net.h | 3 ++-
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3 files changed, 5 insertions(+), 2 deletions(-)
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diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
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index da3e454466b..2869482fe06 100644
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--- a/grub-core/net/bootp.c
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+++ b/grub-core/net/bootp.c
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@@ -777,7 +777,8 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
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grub_errno = GRUB_ERR_NONE;
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t = 0;
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}
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- pack->ident = grub_cpu_to_be32 (t);
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+ pack->xid = grub_cpu_to_be32 (t);
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+ ifaces[j].dhcp_xid = pack->xid;
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pack->seconds = grub_cpu_to_be16 (t);
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grub_memcpy (&pack->mac_addr, &ifaces[j].hwaddress.mac, 6);
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diff --git a/grub-core/net/ip.c b/grub-core/net/ip.c
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index 7c95cc7464a..8411e0ecca3 100644
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--- a/grub-core/net/ip.c
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+++ b/grub-core/net/ip.c
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@@ -275,6 +275,7 @@ handle_dgram (struct grub_net_buff *nb,
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FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
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if (inf->card == card
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&& inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_DHCP_RECV
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+ && inf->dhcp_xid == bootp->xid
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&& inf->hwaddress.type == GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET
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&& grub_memcmp (inf->hwaddress.mac, &bootp->mac_addr,
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sizeof (inf->hwaddress.mac)) == 0)
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diff --git a/include/grub/net.h b/include/grub/net.h
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index f8f3ec13acc..de51894cbbf 100644
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--- a/include/grub/net.h
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+++ b/include/grub/net.h
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@@ -292,6 +292,7 @@ struct grub_net_network_level_interface
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struct grub_net_bootp_packet *dhcp_ack;
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grub_size_t dhcp_acklen;
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grub_uint16_t vlantag;
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+ grub_uint32_t dhcp_xid;
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void *data;
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};
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@@ -429,7 +430,7 @@ struct grub_net_bootp_packet
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grub_uint8_t hw_type; /* hardware type. */
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grub_uint8_t hw_len; /* hardware addr len. */
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grub_uint8_t gate_hops; /* zero it. */
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- grub_uint32_t ident; /* random number chosen by client. */
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+ grub_uint32_t xid; /* transaction id chosen by client. */
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grub_uint16_t seconds; /* seconds since did initial bootstrap. */
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grub_uint16_t flags;
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grub_uint32_t client_ip;
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