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tracing: Introduce helpers to safely handle dynamic-sized sockaddrs

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Enable a struct sockaddr to be stored in a trace record as a
dynamically-sized field. The common cases are AF_INET and AF_INET6
which are different sizes, and are vastly smaller than a struct
sockaddr_storage.

These are safer because, when used properly, the size of the
sockaddr destination field in each trace record is now guaranteed
to be the same as the source address that is being copied into it.

Link: https://lore.kernel.org/all/164182978641.8391.8277203495236105391.stgit@bazille.1015granger.net/
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2022-01-11 12:43:55 -05:00
parent add1511c38
commit d07c9ad622
3 changed files with 65 additions and 2 deletions
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6
include/trace/bpf_probe.h
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@@ -21,6 +21,9 @@
#undef __get_bitmask
#define __get_bitmask(field) (char *)__get_dynamic_array(field)
#undef __get_sockaddr
#define __get_sockaddr(field) ((struct sockaddr *)__get_dynamic_array(field))
#undef __get_rel_dynamic_array
#define __get_rel_dynamic_array(field) \
((void *)(&__entry->__rel_loc_##field) + \
@@ -37,6 +40,9 @@
#undef __get_rel_bitmask
#define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
#undef __get_rel_sockaddr
#define __get_rel_sockaddr(field) ((struct sockaddr *)__get_rel_dynamic_array(field))
#undef __perf_count
#define __perf_count(c) (c)