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[dplane_fpm_sonic]: Fix for SRv6 SIDs learnt from the kernel #21534

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Jan 27, 2025
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[dplane_fpm_sonic]: Fix for SRv6 SIDs learnt from the kernel #21534

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31 changes: 27 additions & 4 deletions src/sonic-frr/dplane_fpm_sonic/dplane_fpm_sonic.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,12 @@
*/
#define FPM_HEADER_SIZE 4

/* Default SRv6 SID format values */
DEFAULT_SRV6_LOCALSID_FORMAT_BLOCK_LEN = 32;
DEFAULT_SRV6_LOCALSID_FORMAT_NODE_LEN = 16;
DEFAULT_SRV6_LOCALSID_FORMAT_FUNCTION_LEN = 16;
DEFAULT_SRV6_LOCALSID_FORMAT_ARGUMENT_LEN = 0;

/**
* Custom Netlink TLVs
*/
Expand Down Expand Up @@ -951,6 +957,7 @@ static ssize_t netlink_srv6_localsid_msg_encode(int cmd,
vrf_id_t vrf_id;
uint32_t table_id;
uint32_t action;
uint32_t block_len, node_len, func_len, arg_len;

struct {
struct nlmsghdr n;
Expand Down Expand Up @@ -1035,28 +1042,44 @@ static ssize_t netlink_srv6_localsid_msg_encode(int cmd,
nl_attr_nest(&req->n, datalen,
FPM_SRV6_LOCALSID_FORMAT);

block_len = nexthop->nh_srv6->seg6local_ctx.block_len;
node_len = nexthop->nh_srv6->seg6local_ctx.node_len;
func_len = nexthop->nh_srv6->seg6local_ctx.function_len;
arg_len = nexthop->nh_srv6->seg6local_ctx.argument_len;

/*
* If block/node/func/arg length are not provided by the srv6 nexthop,
* then we use the default values
*/
if (block_len == 0 && node_len == 0 && func_len == 0 && arg_len == 0) {
block_len = DEFAULT_SRV6_LOCALSID_FORMAT_BLOCK_LEN;
node_len = DEFAULT_SRV6_LOCALSID_FORMAT_NODE_LEN;
func_len = DEFAULT_SRV6_LOCALSID_FORMAT_FUNCTION_LEN;
arg_len = DEFAULT_SRV6_LOCALSID_FORMAT_ARGUMENT_LEN;
}

if (!nl_attr_put8(
&req->n, datalen,
FPM_SRV6_LOCALSID_FORMAT_BLOCK_LEN,
nexthop->nh_srv6->seg6local_ctx.block_len))
block_len))
return -1;

if (!nl_attr_put8(
&req->n, datalen,
FPM_SRV6_LOCALSID_FORMAT_NODE_LEN,
nexthop->nh_srv6->seg6local_ctx.node_len))
node_len))
return -1;

if (!nl_attr_put8(
&req->n, datalen,
FPM_SRV6_LOCALSID_FORMAT_FUNC_LEN,
nexthop->nh_srv6->seg6local_ctx.function_len))
func_len))
return -1;

if (!nl_attr_put8(
&req->n, datalen,
FPM_SRV6_LOCALSID_FORMAT_ARG_LEN,
nexthop->nh_srv6->seg6local_ctx.argument_len))
arg_len))
return -1;

nl_attr_nest_end(&req->n, nest);
Expand Down
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