#define included_ip4_packet_h
#include <vnet/ip/ip_packet.h> /* for ip_csum_t */
-#include <vnet/tcp/tcp_packet.h> /* for tcp_header_t */
#include <vppinfra/byte_order.h> /* for clib_net_to_host_u16 */
+#include <vppinfra/warnings.h> /* for WARN_OFF/WARN_ON macro */
/* IP4 address which can be accessed either as 4 bytes
or as a 32-bit number. */
ip4_address_t addr, mask;
} ip4_address_and_mask_t;
-/* If address is a valid netmask, return length of mask. */
-always_inline uword
-ip4_address_netmask_length (const ip4_address_t * a)
-{
- uword result = 0;
- uword i;
- for (i = 0; i < ARRAY_LEN (a->as_u8); i++)
- {
- switch (a->as_u8[i])
- {
- case 0xff:
- result += 8;
- break;
- case 0xfe:
- result += 7;
- goto done;
- case 0xfc:
- result += 6;
- goto done;
- case 0xf8:
- result += 5;
- goto done;
- case 0xf0:
- result += 4;
- goto done;
- case 0xe0:
- result += 3;
- goto done;
- case 0xc0:
- result += 2;
- goto done;
- case 0x80:
- result += 1;
- goto done;
- case 0x00:
- result += 0;
- goto done;
- default:
- /* Not a valid netmask mask. */
- return ~0;
- }
- }
-done:
- return result;
-}
-
typedef union
{
struct
/* For checksumming we'll want to access IP header in word sized chunks. */
/* For 64 bit machines. */
- /* *INDENT-OFF* */
CLIB_PACKED (struct {
u64 checksum_data_64[2];
u32 checksum_data_64_32[1];
});
- /* *INDENT-ON* */
/* For 32 bit machines. */
- /* *INDENT-OFF* */
CLIB_PACKED (struct {
u32 checksum_data_32[5];
});
- /* *INDENT-ON* */
} ip4_header_t;
/* Value of ip_version_and_header_length for packets w/o options. */
return (void *) i + ip4_header_bytes (i);
}
-always_inline u16
-ip4_header_checksum (ip4_header_t * i)
-{
- u16 save, csum;
- ip_csum_t sum;
+/* Turn off array bounds check due to ip4_header_t
+ option field operations. */
- save = i->checksum;
- i->checksum = 0;
- sum = ip_incremental_checksum (0, i, ip4_header_bytes (i));
- csum = ~ip_csum_fold (sum);
+WARN_OFF(array-bounds)
- i->checksum = save;
+static_always_inline u16
+ip4_header_checksum_inline (ip4_header_t * i, int with_checksum)
+{
+ int option_len = (i->ip_version_and_header_length & 0xf) - 5;
+ uword sum = 0;
+#if uword_bits == 64
+ u32 *iphdr = (u32 *) i;
+
+ sum += iphdr[0];
+ sum += iphdr[1];
+ sum += with_checksum ? iphdr[2] : *(u16 *) (iphdr + 2);
+ /* skip checksum */
+ sum += iphdr[3];
+ sum += iphdr[4];
+
+ if (PREDICT_FALSE (option_len > 0))
+ switch (option_len)
+ {
+ case 10:
+ sum += iphdr[14];
+ case 9:
+ sum += iphdr[13];
+ case 8:
+ sum += iphdr[12];
+ case 7:
+ sum += iphdr[11];
+ case 6:
+ sum += iphdr[10];
+ case 5:
+ sum += iphdr[9];
+ case 4:
+ sum += iphdr[8];
+ case 3:
+ sum += iphdr[7];
+ case 2:
+ sum += iphdr[6];
+ case 1:
+ sum += iphdr[5];
+ default:
+ break;
+ }
+
+ sum = ((u32) sum) + (sum >> 32);
+#else
+ u16 *iphdr = (u16 *) i;
+
+ sum += iphdr[0];
+ sum += iphdr[1];
+ sum += iphdr[2];
+ sum += iphdr[3];
+ sum += iphdr[4];
+ if (with_checksum)
+ sum += iphdr[5];
+ sum += iphdr[6];
+ sum += iphdr[7];
+ sum += iphdr[8];
+ sum += iphdr[9];
+
+ if (PREDICT_FALSE (option_len > 0))
+ switch (option_len)
+ {
+ case 10:
+ sum += iphdr[28];
+ sum += iphdr[29];
+ case 9:
+ sum += iphdr[26];
+ sum += iphdr[27];
+ case 8:
+ sum += iphdr[24];
+ sum += iphdr[25];
+ case 7:
+ sum += iphdr[22];
+ sum += iphdr[23];
+ case 6:
+ sum += iphdr[20];
+ sum += iphdr[21];
+ case 5:
+ sum += iphdr[18];
+ sum += iphdr[19];
+ case 4:
+ sum += iphdr[16];
+ sum += iphdr[17];
+ case 3:
+ sum += iphdr[14];
+ sum += iphdr[15];
+ case 2:
+ sum += iphdr[12];
+ sum += iphdr[13];
+ case 1:
+ sum += iphdr[10];
+ sum += iphdr[11];
+ default:
+ break;
+ }
+#endif
+
+ sum = ((u16) sum) + (sum >> 16);
+ sum = ((u16) sum) + (sum >> 16);
+ return ~((u16) sum);
+}
- /* Make checksum agree for special case where either
- 0 or 0xffff would give same 1s complement sum. */
- if (csum == 0 && save == 0xffff)
- csum = save;
+WARN_ON(array-bounds)
- return csum;
+always_inline u16
+ip4_header_checksum (ip4_header_t * i)
+{
+ return ip4_header_checksum_inline (i, /* with_checksum */ 0);
}
always_inline void
return (ip4->tos & IP_PACKET_TC_FIELD_ECN_MASK);
}
+always_inline u8
+ip4_header_get_ttl (const ip4_header_t *ip4)
+{
+ return (ip4->ttl);
+}
+
+always_inline void
+ip4_header_set_ttl (ip4_header_t *ip4, u8 ttl)
+{
+ ip4->ttl = ttl;
+}
+
always_inline void
ip4_header_set_df (ip4_header_t * ip4)
{
static inline uword
ip4_header_checksum_is_valid (ip4_header_t * i)
{
- return i->checksum == ip4_header_checksum (i);
+ return ip4_header_checksum_inline (i, /* with_checksum */ 1) == 0;
}
#define ip4_partial_header_checksum_x1(ip0,sum0) \
return (a->data[0] & 0xf0) == 0xe0;
}
+always_inline uword
+ip4_address_is_global_broadcast (const ip4_address_t * a)
+{
+ return (a->as_u32) == 0xffffffff;
+}
+
always_inline void
ip4_multicast_address_set_for_group (ip4_address_t * a,
ip_multicast_group_t g)
ethernet_address[5] = d[3];
}
-always_inline void
-ip4_tcp_reply_x1 (ip4_header_t * ip0, tcp_header_t * tcp0)
-{
- u32 src0, dst0;
-
- src0 = ip0->src_address.data_u32;
- dst0 = ip0->dst_address.data_u32;
- ip0->src_address.data_u32 = dst0;
- ip0->dst_address.data_u32 = src0;
-
- src0 = tcp0->src;
- dst0 = tcp0->dst;
- tcp0->src = dst0;
- tcp0->dst = src0;
-}
-
-always_inline void
-ip4_tcp_reply_x2 (ip4_header_t * ip0, ip4_header_t * ip1,
- tcp_header_t * tcp0, tcp_header_t * tcp1)
-{
- u32 src0, dst0, src1, dst1;
-
- src0 = ip0->src_address.data_u32;
- src1 = ip1->src_address.data_u32;
- dst0 = ip0->dst_address.data_u32;
- dst1 = ip1->dst_address.data_u32;
- ip0->src_address.data_u32 = dst0;
- ip1->src_address.data_u32 = dst1;
- ip0->dst_address.data_u32 = src0;
- ip1->dst_address.data_u32 = src1;
-
- src0 = tcp0->src;
- src1 = tcp1->src;
- dst0 = tcp0->dst;
- dst1 = tcp1->dst;
- tcp0->src = dst0;
- tcp1->src = dst1;
- tcp0->dst = src0;
- tcp1->dst = src1;
-}
-
#endif /* included_ip4_packet_h */
/*
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