seitan: Add netlink, sendto()/sendmsg(), iovec handling, demo with routes

A bit rough at the moment, but it does the trick. Bonus: setsockopt()
(with magic values only, not used in any demo yet).

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

3 files changed, 37 insertions, 2 deletions

diff --git a/common/gluten.h b/common/gluten.h
index e80916a..1414d9e 100644
--- a/common/gluten.h
+++ b/common/gluten.h
@@ -70,6 +70,7 @@ enum op_type {
 	OP_RETURN,
 	OP_LOAD,
 	OP_STORE,
+	OP_IOVLOAD,
 	OP_BITWISE,
 	OP_CMP,
 	OP_RESOLVEDFD,
@@ -210,6 +211,13 @@ struct op_store {
 	struct gluten_offset count;
 };
 
+struct op_iovload {
+	struct gluten_offset iov;
+	struct gluten_offset iovlen;
+	struct gluten_offset dst;
+	size_t size;
+};
+
 enum op_cmp_type {
 	CMP_EQ,
 	CMP_NE,
@@ -278,6 +286,7 @@ struct op {
 		struct op_fd fd;
 		struct op_load load;
 		struct op_store store;
+		struct op_iovload iovload;
 		struct op_bitwise bitwise;
 		struct op_cmp cmp;
 		struct op_resolvefd resfd;
@@ -291,8 +300,12 @@ struct op {
 # define GLUTEN_CONST const
 #endif
 
+struct gluten_header {
+	struct gluten_offset relocation[256];
+};
+
 struct gluten {
-	GLUTEN_CONST char header[HEADER_SIZE];
+	GLUTEN_CONST struct gluten_header header;
 
 	GLUTEN_CONST char inst[INST_SIZE];
 
@@ -309,7 +322,7 @@ static inline bool is_offset_valid(const struct gluten_offset x)
 {
 	switch (x.type) {
 	case OFFSET_NULL:
-		return false;
+		return true;
 	case OFFSET_DATA:
 		return x.offset < DATA_SIZE;
 	case OFFSET_RO_DATA:
@@ -319,6 +332,7 @@ static inline bool is_offset_valid(const struct gluten_offset x)
 	case OFFSET_SECCOMP_DATA:
 		return x.offset < 6;
 	default:
+		debug("unknown offset in range check");
 		return false;
 	}
 }
diff --git a/common/util.c b/common/util.c
index 3e81a1c..94aeea3 100644
--- a/common/util.c
+++ b/common/util.c
@@ -18,6 +18,8 @@
 
 #include "gluten.h"
 
+#include "../cooker/calls.h"
+
 #define logfn(name)							\
 void name(const char *format, ...) {					\
 	va_list args;							\
@@ -56,6 +58,24 @@ const char *cmp_type_str[CMP_MAX + 1] = {
 };
 
 const char *metadata_type_str[METADATA_MAX + 1] = { "uid", "gid", "pid" };
+
+const char *syscall_name(long nr) {
+	struct call **set, *call;
+
+	for (set = call_sets, call = set[0]; *set; call++) {
+		if (!call->name) {
+			set++;
+			call = set[0];
+			continue;
+		}
+
+		if (nr == call->number)
+			break;
+	}
+
+	return call ? call->name : "unknown";
+}
+
 const char *syscall_name_str[N_SYSCALL + 1] = {
 	[__NR_chown] 			= "chown",
 	[__NR_connect] 			= "connect",
diff --git a/common/util.h b/common/util.h
index 1367c0d..61fb3fe 100644
--- a/common/util.h
+++ b/common/util.h
@@ -130,6 +130,7 @@ void debug(const char *format, ...);
 #define BITS_PER_NUM(n)		(const_ilog2(n) + 1)
 #define N_SYSCALL                       512
 extern const char *syscall_name_str[N_SYSCALL + 1];
+const char *syscall_name(long nr);
 
 #define ret_clone_err(c, ...)     \
         do {                      \