diff options
| author |   Ignas Bačius <ignas@noia.network> | 2019-10-03 17:15:38 +0300 |
|---|---|---|
| committer |   Damjan Marion <dmarion@me.com> | 2019-10-23 07:52:22 +0000 |
| commit | eeb5fb3a50079e1af6e655694c6ff99ec2f9d070 (patch) | |
| tree | da14b1e36c66e6977e175cbe040892df57f828cf /src/vnet/srv6/sr_policy_rewrite.c | |
| parent | bd0a00a45637c1dde533ef6c3798418c2ab15009 (diff) | |
sr: add "set sr encaps hop-limit" command
Default hop-limit for the encapsulating IPv6 header is a compile-time
constant. Add ability to specify custom hop-limit, in order to avoid
packets being dropped with "hop limit exceeded in transit" response in
certain network configurations.
Type: feature
Signed-off-by: Ignas Bačius <ignas@noia.network>
Change-Id: I77f2b35c987cfd31801dc2744d31fb3c1984158f
Diffstat (limited to 'src/vnet/srv6/sr_policy_rewrite.c')
| -rwxr-xr-x | src/vnet/srv6/sr_policy_rewrite.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/src/vnet/srv6/sr_policy_rewrite.c b/src/vnet/srv6/sr_policy_rewrite.c index feac151665a..8d11da67ddf 100755 --- a/src/vnet/srv6/sr_policy_rewrite.c +++ b/src/vnet/srv6/sr_policy_rewrite.c @@ -107,6 +107,7 @@ static dpo_type_t sr_pr_bsid_insert_dpo_type; * @brief IPv6 SA for encapsulated packets */ static ip6_address_t sr_pr_encaps_src; +static u8 sr_pr_encaps_hop_limit = IPv6_DEFAULT_HOP_LIMIT; /******************* SR rewrite set encaps IPv6 source addr *******************/ /* Note: This is temporal. We don't know whether to follow this path or @@ -141,6 +142,44 @@ VLIB_CLI_COMMAND (set_sr_src_command, static) = { }; /* *INDENT-ON* */ +/******************** SR rewrite set encaps IPv6 hop-limit ********************/ + +void +sr_set_hop_limit (u8 hop_limit) +{ + sr_pr_encaps_hop_limit = hop_limit; +} + +u8 +sr_get_hop_limit (void) +{ + return sr_pr_encaps_hop_limit; +} + +static clib_error_t * +set_sr_hop_limit_command_fn (vlib_main_t * vm, unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + int hop_limit = sr_get_hop_limit (); + + if (unformat_check_input (input) == UNFORMAT_END_OF_INPUT) + return clib_error_return (0, "No value specified"); + if (!unformat (input, "%d", &hop_limit)) + return clib_error_return (0, "Invalid value"); + if (hop_limit <= 0 || hop_limit > 255) + return clib_error_return (0, "Value out of range [1-255]"); + sr_pr_encaps_hop_limit = (u8) hop_limit; + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (set_sr_hop_limit_command, static) = { + .path = "set sr encaps hop-limit", + .short_help = "set sr encaps hop-limit <value>", + .function = set_sr_hop_limit_command_fn, +}; +/* *INDENT-ON* */ + /*********************** SR rewrite string computation ************************/ /** * @brief SR rewrite string computation for IPv6 encapsulation (inline) @@ -175,7 +214,7 @@ compute_rewrite_encaps (ip6_address_t * sl) iph->src_address.as_u64[1] = sr_pr_encaps_src.as_u64[1]; iph->payload_length = header_length - IPv6_DEFAULT_HEADER_LENGTH; iph->protocol = IP_PROTOCOL_IPV6; - iph->hop_limit = IPv6_DEFAULT_HOP_LIMIT; + iph->hop_limit = sr_pr_encaps_hop_limit; if (vec_len (sl) > 1) { |