diff options
| author | Ronan Pigott <ronan@rjp.ie> | 2024-10-06 09:36:03 -0700 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2025-10-31 20:05:40 +0100 |
| commit | 35cd3e7cff079c561ba616c792d5fdf13f6bd331 (patch) | |
| tree | f147935f69c8e9ae20120f57aa5b581ada293ffc | |
| parent | 31007975ccf5a389b76e1bc6f5f7215847f394ef (diff) | |
doc: don't suggest to disable GSO
The kernel can form aggregate packets whether or not GSO is enabled.
Disabling GSO is not a useful suggestion in this case.
Fixes: 05628cdd677d (doc: describe behaviour of {ip,ip6} length)
Signed-off-by: Florian Westphal <fw@strlen.de>
| -rw-r--r-- | doc/payload-expression.txt | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/doc/payload-expression.txt b/doc/payload-expression.txt index 351c79bc..8b538968 100644 --- a/doc/payload-expression.txt +++ b/doc/payload-expression.txt @@ -134,13 +134,12 @@ Destination address | ipv4_addr |====================== -Careful with matching on *ip length*: If GRO/GSO is enabled, then the Linux -kernel might aggregate several packets into one big packet that is larger than -MTU. Moreover, if GRO/GSO maximum size is larger than 65535 (see man ip-link(8), -specifically gro_ipv6_max_size and gso_ipv6_max_size), then *ip length* might -be 0 for such jumbo packets. *meta length* allows you to match on the packet -length including the IP header size. If you want to perform heuristics on the -*ip length* field, then disable GRO/GSO. +Careful with matching on *ip length*: The Linux kernel might aggregate several +packets into one big packet that is larger than MTU. Moreover, if GRO/GSO +maximum size is larger than 65535 (see man ip-link(8), specifically +gro_ipv4_max_size and gso_ipv4_max_size), then *ip length* might be 0 for such +jumbo packets. *meta length* allows you to match on the packet length including +the IP header size. ICMP HEADER EXPRESSION ~~~~~~~~~~~~~~~~~~~~~~ @@ -252,13 +251,12 @@ Destination address | ipv6_addr |======================= -Careful with matching on *ip6 length*: If GRO/GSO is enabled, then the Linux -kernel might aggregate several packets into one big packet that is larger than -MTU. Moreover, if GRO/GSO maximum size is larger than 65535 (see man ip-link(8), -specifically gro_ipv6_max_size and gso_ipv6_max_size), then *ip6 length* might -be 0 for such jumbo packets. *meta length* allows you to match on the packet -length including the IP header size. If you want to perform heuristics on the -*ip6 length* field, then disable GRO/GSO. +Careful with matching on *ip6 length*: The Linux kernel might aggregate several +packets into one big packet that is larger than MTU. Moreover, if GRO/GSO +maximum size is larger than 65535 (see man ip-link(8), specifically +gro_max_size and gso_max_size), then *ip6 length* might be 0 for such +jumbo packets. *meta length* allows you to match on the packet length including +the IPv6 header size. .Using ip6 header expressions ----------------------------- |