This patch implements section 5.3.4. of RFC6458, that is, support for 'SCTP Send Information Structure' (SCTP_SNDINFO) which can be placed into ancillary data cmsghdr structure for sendmsg() calls. The sctp_sndinfo structure is defined as per RFC as below ... struct sctp_sndinfo { uint16_t snd_sid; uint16_t snd_flags; uint32_t snd_ppid; uint32_t snd_context; sctp_assoc_t snd_assoc_id; }; ... and supplied under cmsg_level IPPROTO_SCTP, cmsg_type SCTP_SNDINFO, while cmsg_data[] contains struct sctp_sndinfo. An sctp_sndinfo item always corresponds to the data in msg_iov. Joint work with Daniel Borkmann.
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| @@ -154,6 +154,22 @@ struct sctp_sndrcvinfo { · 153 unmodified lines | |||
| 154 | sctp_assoc_t sinfo_assoc_id; | 154 | sctp_assoc_t sinfo_assoc_id; |
| 155 | }; | 155 | }; |
| 156 | 156 | ||
| 157 | /* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO) | ||
| 158 | * | ||
| 159 | * This cmsghdr structure specifies SCTP options for sendmsg(). | ||
| 160 | * | ||
| 161 | * cmsg_level cmsg_type cmsg_data[] | ||
| 162 | * ------------ ------------ ------------------- | ||
| 163 | * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo | ||
| 164 | */ | ||
| 165 | struct sctp_sndinfo { | ||
| 166 | __u16 snd_sid; | ||
| 167 | __u16 snd_flags; | ||
| 168 | __u32 snd_ppid; | ||
| 169 | __u32 snd_context; | ||
| 170 | sctp_assoc_t snd_assoc_id; | ||
| 171 | }; | ||
| 172 | |||
| 157 | /* | 173 | /* |
| 158 | * sinfo_flags: 16 bits (unsigned integer) | 174 | * sinfo_flags: 16 bits (unsigned integer) |
| 159 | * | 175 | * |
| @@ -177,10 +193,12 @@ typedef union { · 17 unmodified lines | |||
| 177 | 193 | ||
| 178 | /* These are cmsg_types. */ | 194 | /* These are cmsg_types. */ |
| 179 | typedef enum sctp_cmsg_type { | 195 | typedef enum sctp_cmsg_type { |
| 180 | SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */ | 196 | SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */ |
| 181 | #define SCTP_INIT SCTP_INIT | 197 | #define SCTP_INIT SCTP_INIT |
| 182 | SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */ | 198 | SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */ |
| 183 | #define SCTP_SNDRCV SCTP_SNDRCV | 199 | #define SCTP_SNDRCV SCTP_SNDRCV |
| 200 | SCTP_SNDINFO, /* 5.3.4 SCTP Send Information Structure */ | ||
| 201 | #define SCTP_SNDINFO SCTP_SNDINFO | ||
| 184 | } sctp_cmsg_t; | 202 | } sctp_cmsg_t; |
| 185 | 203 | ||
| 186 | /* | 204 | /* |