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ip_forward: fix IPv4 forwarding with multiple netifs/offloading

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When we have multiple netifs where at least one has checksum offloading
capabilities, IP forwarding needs to set various checksum fields to 0
to prevent HW algorithms on calculating an invalid checksum.

-> set checksum fields of IP/UDP/TCP/ICMP to 0 in ip4_forward().

See bug #56288

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>
This commit is contained in:
Simon Goldschmidt
2020-01-30 23:02:16 +01:00
parent 695c323164
commit 61c67fc229
2 changed files with 34 additions and 1 deletions
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4
src/include/lwip/netif.h
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@@ -404,8 +404,10 @@ struct netif {
#if LWIP_CHECKSUM_CTRL_PER_NETIF
#define NETIF_SET_CHECKSUM_CTRL(netif, chksumflags) do { \
(netif)->chksum_flags = chksumflags; } while(0)
#define IF__NETIF_CHECKSUM_ENABLED(netif, chksumflag) if (((netif) == NULL) || (((netif)->chksum_flags & (chksumflag)) != 0))
#define NETIF_CHECKSUM_ENABLED(netif, chksumflag) (((netif) == NULL) || (((netif)->chksum_flags & (chksumflag)) != 0))
#define IF__NETIF_CHECKSUM_ENABLED(netif, chksumflag) if NETIF_CHECKSUM_ENABLED(netif, chksumflag)
#else /* LWIP_CHECKSUM_CTRL_PER_NETIF */
#define NETIF_CHECKSUM_ENABLED(netif, chksumflag) 0
#define NETIF_SET_CHECKSUM_CTRL(netif, chksumflags)
#define IF__NETIF_CHECKSUM_ENABLED(netif, chksumflag)
#endif /* LWIP_CHECKSUM_CTRL_PER_NETIF */