Previously the BFD packet creation code did not appropriately set
offsets or flags. This contributed to issues involving encapsulation and
the TSO code.
Fixes: ccc096898c46 ("bfd: Implement Bidirectional Forwarding Detection.")
Signed-off-by: Mike Pattrick
---
v2: Corrected formatting, and just calculate checksum up front
---
lib/bfd.c | 23 +++
1 file changed, 11 insertions(+), 12 deletions(-)
diff --git a/lib/bfd.c b/lib/bfd.c
index 9698576d0..9af258917 100644
--- a/lib/bfd.c
+++ b/lib/bfd.c
@@ -586,7 +586,6 @@ bfd_put_packet(struct bfd *bfd, struct dp_packet *p,
{
long long int min_tx, min_rx;
struct udp_header *udp;
-struct eth_header *eth;
struct ip_header *ip;
struct msg *msg;
@@ -605,15 +604,13 @@ bfd_put_packet(struct bfd *bfd, struct dp_packet *p,
* set. */
ovs_assert(!(bfd->flags & FLAG_POLL) || !(bfd->flags & FLAG_FINAL));
-dp_packet_reserve(p, 2); /* Properly align after the ethernet header. */
-eth = dp_packet_put_uninit(p, sizeof *eth);
-eth->eth_src = eth_addr_is_zero(bfd->local_eth_src)
-? eth_src : bfd->local_eth_src;
-eth->eth_dst = eth_addr_is_zero(bfd->local_eth_dst)
-? eth_addr_bfd : bfd->local_eth_dst;
-eth->eth_type = htons(ETH_TYPE_IP);
+ip = eth_compose(p,
+ eth_addr_is_zero(bfd->local_eth_dst)
+ ? eth_addr_bfd : bfd->local_eth_dst,
+ eth_addr_is_zero(bfd->local_eth_src)
+ ? eth_src : bfd->local_eth_src,
+ ETH_TYPE_IP, sizeof *ip + sizeof *udp + sizeof *msg);
-ip = dp_packet_put_zeros(p, sizeof *ip);
ip->ip_ihl_ver = IP_IHL_VER(5, 4);
ip->ip_tot_len = htons(sizeof *ip + sizeof *udp + sizeof *msg);
ip->ip_ttl = MAXTTL;
@@ -621,15 +618,17 @@ bfd_put_packet(struct bfd *bfd, struct dp_packet *p,
ip->ip_proto = IPPROTO_UDP;
put_16aligned_be32(&ip->ip_src, bfd->ip_src);
put_16aligned_be32(&ip->ip_dst, bfd->ip_dst);
-/* Checksum has already been zeroed by put_zeros call. */
+/* Checksum has already been zeroed by eth_compose call. */
ip->ip_csum = csum(ip, sizeof *ip);
+dp_packet_set_l4(p, ip + 1);
-udp = dp_packet_put_zeros(p, sizeof *udp);
+udp = dp_packet_l4(p);
udp->udp_src = htons(bfd->udp_src);
udp->udp_dst = htons(BFD_DEST_PORT);
udp->udp_len = htons(sizeof *udp + sizeof *msg);
+/* Checksum already zero from eth_compose. */
-msg = dp_packet_put_uninit(p, sizeof *msg);
+msg = (struct msg *)(udp + 1);
msg->vers_diag = (BFD_VERSION << 5) | bfd->diag;
msg->flags = (bfd->state & STATE_MASK) | bfd->flags;
--
2.39.3
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