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vere: adds comments discussing protocol-version constraints

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This commit is contained in:
Joe Bryan 2020-10-20 15:44:58 -07:00
parent 7b4e48deb7
commit 67f06ce5e5
1 changed files with 17 additions and 1 deletions
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18
pkg/urbit/vere/io/ames.c
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@ -1007,6 +1007,19 @@ _ames_hear(u3_ames* sam_u,
u3_head hed_u;
u3_body bod_u;
// XX packet filtering needs to revised for two protocol-change scenarios
//
// - packets using old protocol versions from our sponsees
// these must be let through, and this is a transitive condition;
// they must also be forwarded where appropriate
// they can be validated, as we know their semantics
//
// - packets using newer protocol versions
// these should probably be let through, or at least
// trigger printfs suggesting upgrade.
// they cannot be filtered, as we do not know their semantics
//
// unpack header, ensuring buffer is large enough
//
if ( (4 > len_w)
@ -1020,7 +1033,7 @@ _ames_hear(u3_ames* sam_u,
// ensure the protocol version matches ours
//
// XX rethink
// XX rethink use of [fit_o] here and elsewhere
//
if ( (c3y == sam_u->fig_u.fit_o)
&& (sam_u->ver_y != hed_u.ver_y) )
@ -1243,6 +1256,9 @@ _ames_prot_scry_cb(void* vod_p, u3_noun nun)
sam_u->ver_y = ver;
}
// XX revise: filtering should probably be disabled if
// we get a protocol version above the latest one we know
//
sam_u->fig_u.fit_o = c3y;
u3z(nun);
}